Roller with a large rotating speed range.

p0001(Also called "Galette" or Godet ") The invention relates in a first aspect to a draw roller unit for Filamentbearbeitung as example such devices from DE 26 39 458, EP-A-113 407, US-C-3,772,492, GB-C-1204933 are known, among other things.

p0002Such aggregates comprises a rotatable shaft and has nowadays a permissible speed range, which is limited by the critical speed in such a way that the permissible range<ul><li>a) is below the second critical speed of the shaft, and</li><li>b) has a "discontinuity" at the first bending critical speed of the shaft.</li></ul>

p0003More critical speeds of the unit (eg frame oscillations or torsional shape of the shaft) can be given by the environment or the clamping operation, but are usually insignificant for restricting the permitted speed in their effect or can be muted by commercial elements.

p0004The critical speeds of the shaft, which are mentioned below in the present specification, referred to only as "the critical speeds".

p0005The meaning of this statement will now be briefly explained with reference to Figure 1 on. This diagram shows merely a horizontal axis with speed between O and a limit L3. Assume a draw roller unit is designed for use at speeds up to L3. This limit value is normally determined by the second critical speed, that is, when the rotational speed of the rotating components of the unit above L3 is increased, damage within an unacceptably short period of time can be expected.

p0006But this unit can not readily be used with any speed below the limit L3. Although within the speed range O to L3 is the first critical speed and lesions are also inevitable when the aggregate over a longer period within a speed range L1 is driven by L2 to this first critical speed, provided that this unit is not very accurate and with great effort was overall balanced. Safe operation is also then only possible if the balance quality is maintained. The operating instructions of such aggregates are therefore demanding that the area is L1 to L2 only Duch drive to get into the safe area L2 to L3.

p0007Nevertheless, if an operation in the range L1 to L2 would need regular vibration of the unit may have to be measured, as eg. by heating, contamination or solving by internal stresses that balance quality could change and thus again a safe operation would be compromised

p0008A continuous operation in the range L1 to L2 is only permissible in any case, if the entire unit is balanced after assembly again. It has to be achieved a very high quality of balancing. If any modifications to the unit (replacement of a rotating part) of the balancing process has to be repeated, which is a significant complication in the operation of such aggregates. It must also be ensured and checked that the balancing quality as not impaired by thermal action (heated draw roll) over time, which may lead to unacceptable vibrations and ev. Damages.

p0009By suitable measures (in particular by vibration damping in the bracket between the unit and the supporting frame) has been tried, - The limit to increase L3, - To make the resonance range L1 to L2 as closely as possible, - To reduce vibrations of the whole unit.

p0010Nevertheless, so far as we know each draw roller unit has a more or less wide "forbidden speed zone" below the maximum speed, which limits its use for certain applications. Further, it has heretofore been necessary to balance both the individual rotating parts of the machine as well as the aggregate as a whole. This is cumbersome and expensive, not only in manufacturing but also during maintenance (inserting a spare part) or adaptation of the unit.

p0011The inventors have now found that it is possible to damp vibrations of a draw roll assembly in such a way that the permissible speed range is continuous up to an upper limit value and may be dispensed with balancing of the assembly as a whole. The benefits will be obvious from the above description.

p0012A draw roller unit according to this invention has at least one rotating in the operation part, at least one stationary part in the operation, and a bearing between the said parts and is characterized in that means for vibration absorption are directly provided between the bearing and the stationary part.

p0013The invention differs from that described in DAS 2,639,458 Galette characterized in that the first critical area is not shifted but is merged with the normal operating range.

p0014Three variants of the assembly are possible, as illustrated by the sketches shown in FIG. 2 In all three diagrams (Figures 2A, 2B and 2C) is the fadenaufnehmende element (the "roller") denoted by R and this element is mounted on a shaft W, so that these two elements together form a rotating part. This part is placed in operation in all three variants by a motor M in rotation about the axis of the shaft W. Here, the rotating part is supported in all three variants via a roller bearing K (or other suitable storage) in a holder or a bearing housing G. The three variants differ only in the position of the motor relative to the storage: - Is in Figure 2A, the motor (consisting of a stator on the housing G and the rotor on the shaft W) in the housing G between two roller bearings. - Is in Figure 2B, the motor outside the housing G, and the motor shaft MW is with the roller shaft W via a clutch coupled Ku. - Shown in Fig. 2C, the wave W is extended outside the housing G and the motor M is directly mounted on the housing so that the rotor can be further applied to the shaft W (as in the variant of FIG. 2A).

p0015In all three cases, vibration damping D is mounted directly between the bearing and the housing K G. This not only the vibrations but also the imbalance induced bearing loads are kept low and thus extending the life. The invention relates in further aspects to arrangements for vibration damping. In this context, the following further discharges are mounted.

p0016When storing rotating shafts by bearing the occurring negative phenomena are well known. Fabrication Due arise low runout on the shaft or the rotating parts. This always lead to undesirable vibrations and oscillations of the shaft, which will first be transferred to the housing via the bearing. Such vibrations can reduce the life of the entire arrangement greatly or even lead to breakage of the shaft.

p0017For damping such vibrations, various solutions have become known. In the simplest way, a vibration damping through the involvement of rubber-elastic materials cause, as demonstrated in DAS 26 39 458 for example. However, it should be remembered that such materials are not suitable for all applications because rubber usually has only a relatively low temperature resistance and is more or less affected by lubricant and especially by aggressive media.

p0018Additional aspects of the invention accordingly relate to arrangements for vibration damping in a heatable galette for Filamentbearbeitung wherein the Galette can be set by a shaft in rotation, in which the shaft is guided in a bearing assembly and in are provided in the bearing assembly means for vibration damping ,

p0019In a first additional aspect of the arrangement is gekennzeicht characterized in that the bearing is clamped in a spring disposed in a housing bearing bush and the bush is surrounded by a narrow gap. The gap can be geflüllt with liquid. In this way, wave oscillations or vibrations of the shaft will still be transferred to the bearing bush, but pass through the sprung bearing of the bush only very subdued for housing.

p0020In a particularly advantageous and simple manner, the bearing bush with O-rings is supported on the housing. The already very temperature-stable O-rings are also exposed to extremely high temperatures, since the bearing bushing dissipates a part of the frictional heat generated in the bearing.

p0021By the O-rings, an annular gap between the housing and the bearing bushing is limited, which is preferably connected to a compressed oil source. In this way, a damping effect is generated at a radial oscillation of the bushing by Oelverdrängung.

p0022After the previously described construction of the inventive arrangements according to the first additional aspect, the bearing bush is able to perform at least radial relative movements relative to the housing. In a further advantageous embodiment of the subject invention is now provided to arrange between the housing and the bearing sleeve substantially coaxial with the shaft spring pins, the center the bearing bush and prevent even under radial load an abutment of the bush. To this end, each spring pin is anchored at one end in the housing and at the other end in the bearing bush. For better utilization of the spring properties of the pins in each case a middle portion of the spring pin lies with radial play in a recess of the bearing bush.

p0023In this context, it is particularly simple and advantageous to provide the facing the housing end face of the bearing bush with a circumferential groove for receiving the spring pins. Such a groove is easy to produce. Alternatively, it is conceivable to provide a bore in the bearing bushing for each spring pin, in which the non-gripped area of ​​the spring pin is located so that when relative movement between the bearing bush and the housing an abutment of the pin is prevented from bearing bush.

p0024Advantageously, a plurality of spring pins are anchored at regular angular intervals in the bearing bush.

p0025The bearing bushing can have a substantially L-shaped cross-section, so that the bearing is easy to mount and is exposed in the installed state with a relatively large area to the ambient temperature, whereby considerable advantages with respect to the cooling arise.

p0026It has proved to be expedient if the clamped ends of each spring pin are approximately the same length.

p0027In a second additional aspect of the arrangement is characterized in that the bearing of the bearing assembly are supported on a wire mesh on the bearing housing. In this way, a low-cost but effective arrangement for vibration damping of galettes, is simple to manufacture and assemble, requires no maintenance and at any temperature certainly doing its job.

p0028To a particularly advantageous embodiment of the subject invention can be reached, if provided in the bearing arrangement at least two at an axial distance to each other arranged bearing. Such a configuration results in a very effective vibration damping, the constructive overhead is more than offset by a very large bearing life.

p0029It is furthermore particularly advantageous if the wire mesh is formed into a ring body which is disposed between the outer bearing ring and the housing. The removal and installation of the wire mesh is feasible in the simplest form. To particularly good results, it has resulted, when the cross section of the annular body is square.

p0030Advantageously, can assemble the annular body of several ring segments such that defective become segments are individually replaceable with new ones. In such a configuration, it may be advantageous if between the ring segments spaces are provided, so that mass changes at extremely high temperatures are compensated.

p0031The invention in this second additional aspect, for example, also be designed so that between the bearing outer ring and the ring segments a bushing disposed.

p0032The invention further provides a few minor aspects which contribute to the prevention or reduction of vibration individually and / or in combination.

p0033The first sub-aspect relates to the balancing of the stretching roller, which is designed essentially as a hollow cylinder and has at one end by an end wall, wherein on the end wall a displaceable into rotation shaft is fixed, which is supported on the end wall remote from the end and with the radially inner sheath of drawing roller defines a heated annulus, wherein circumferentially distributed balance weights are attached to the axial boundary surfaces of the draw roll.

p0034It is well known that due to the high operating speeds of draw rolls to avoid excessive stress on the shaft bearings, balancing is essential, since the bearings have already been receiving considerable weight and vibration forces during operation.

p0035Such stretch rolls are known. For example, EP-PS 0113407 shows a draw roll with the above-mentioned features, wherein a first balancing ring by means of two diametrically opposed bolts is attached to the bearing point of the end face remote from the draw roll. The first balancing ring is substantially circular disc-shaped and is located with respect to a necessary centering with its periphery in a recess of the end face and has a number of threaded bores for receiving balancing weights, wherein the axes of the threaded bores are arranged coaxially to the axis of the drive shaft.

p0036At the end of the end face facing away from the drawing roller is a second balancing ring, which is connected by means of a press fit positively to the outer casing of the drawing roller and thus also performed centrally.

p0037In the second balancing ring being arranged coaxially to the shaft axis threaded bores in the balance weights can be screwed.

p0038In this known draw roll, it is especially advantageous as less can be seen that two separate components (balancing rings) are required for balancing. The balancing rings must also be made more specific. So the first balancing ring with respect to its outer diameter must closely agree. Moreover, an additional processing of the front side of the draw roll is necessary because the first balancing ring is only centered exactly when the balancing ring is play as possible in the recess of the end face. Further, interchanging centering during maintenance is not excluded in the rough workshop operation, so that the balancing ring may have a negative impact on the balance of the draw roll.

p0039Also on the manufacture and assembly of the second balancing ring must be used great care. Here also thermal problems are particularly to be considered as is usually the balancing ring, made from a comparatively light material, such as aluminum and, therefore, normally has a different coefficient of expansion than the material of the draw roll. Special measures to prevent unwanted twisting of the second Auswuchtringes Furthermore must be provided.

p0040Overall require stretch rolls this known design relatively high manufacturing and assembly costs.

p0041The present invention has therefore set itself the task to provide a structurally simple drawing roller according to the preamble in which the number of required machine elements is minimized, which is reliable in operation and in which the balancing is quick and simple to perform.

p0042According to the first sub-aspect, this object is achieved in that the bearing facing annular surface of the draw roll is threaded bores for receiving balancing weights. In such a configuration, it is regarded as particularly advantageous that for balancing any special components for receiving the balancing weights have to be provided. The threaded holes for receiving the balancing weights are in the draw roll itself, so that the total weight of the draw roll is not changed.

p0043An advantageous development of this embodiment is characterized in that where the bearing end facing the draw roll a threaded bores annular bead is formed. Characterized the balancing of the stretching roller to the bearing point of the end facing is particularly facilitated by the balance weights in the threaded holes are also seen from the end face of the draw roll inserted. Advantages in terms of the total weight obtained if the holes drilled in the second balancing ring, but are provided only on a part of its length with a thread.

p0044It is also advantageous and expedient if the torus is assigned as the draw roll a larger outer diameter. The annular ring thus rises above the outer shell of the draw roll, which in turn can be still made by a single rotary operation. Inevitably, eliminated by the use of identical materials thermal expansion problems.

p0045A simple yet effective embodiment is achieved by the threaded holes are closed at one end. While one part dirt particles away from the threaded holes in this way, the balance weights, preferably designed as a grub screw on the other hand fixed after installation without additional tools and held captive.

p0046The screwing of the balancing weights is without any problems in a simple and advantageous manner when the axes of the threaded bores are arranged at an acute angle to the axis of the draw roll, so that the corresponding screwing tool if necessary to handle safely even when switched draw roll heating.

p0047The second side aspect relates to a Axialverschluss for hollow rotatable rollers, especially for double-clad draw rolls in Filamentbearbeitung, in a criss-crossed with cavities roller casing together with a front end forming a cup-shaped, rotationally symmetrical rotary body, in the face of a driven, inside hollow cylinder disposed shaft is connected, wherein in the hollow roller a cavity is formed with an essentially annular cross section for receiving a stationary heating device and in which the said cavity facing away from the end face of the end face is provided with a rotationally symmetrical cap.

p0048In stretch rolls, it is common, balance weights and Temperature sensors to be mounted on the bearing surface facing away from the front side, so that they face must be freely accessible during the balancing and maintenance work on temperature probe. On the other hand there is a desire, at least indemnify the temperature probe from contamination and to prevent damage.

p0049This is usually done by a cover, which is screwed to the balancing of the hollow roll and after the mounting of the temperature sensor with the end face of the draw roll and can be attached to the threaded pins for the full balancing.

p0050In a known of closure of the cover consists of an aluminum disc which is fixed by means of two screws on the end face of the draw roll. The end face of the draw roll is shaped with a view to minimizing unbalance such that the peripheral surface of the lid is located in a recess in the end side and is held radially.

p0051When it is less advantageous to look in this known Axialverschluss that the requirements lead to the mechanical strength to a relatively thick cover, so that even with the use of a comparatively lightweight aluminum material is not an appreciable weight saving occurs. Aluminium also has good thermal conductivity, so that inevitably a considerable loss of heat is radiated over the lid.

p0052From the manufacturing point of view the production of the cover is complex and therefore expensive, especially as the radial dimensions must be adhered to as closely as possible. Further, a 180-degree twisted mounting of the lid is made possible by the arrangement of the fastening screws. Also, in simultaneous maintenance and adjustment work on several draft rollers not be ruled out that by mistake a lid is mounted to an unforeseen role for him, which in turn can lead to imbalances. Finally it must be mentioned that each lid must be balanced separately before assembly and that the agreement reached in balancing weight distribution is optimized for the correct installation position at a given draw roll.

p0053The object of the present invention in its second side aspect, therefore, is to provide a simple Axialverschluss of the aforementioned type which is simple to manufacture and assemble, lowest possible imbalance causes, is in terms of weight is minimized and no noticeable effect on the temperature distribution on the surface of the draw roll Has.

p0054According to the second sub-aspect of the invention, this object is achieved in that the lid is centrally connected to the hollow roll. In this context it is particularly advantageous if the lid is designed as formed sheet metal part having low thermal conductivity and has a central centering ring. In this way, the cover is almost as thin as desired to manufacture, for example as a low-cost deep-drawn part and has been due to the low thickness of the material on a possible small thermal conductivity.

p0055To a particularly advantageous embodiment of the invention the object is achieved if the centering of the cap is radially fixed by a recess on the end face of the draw roll. The centering ring is independently made from the cover on a lathe and then welded to the example. Chrome steel thermoformed lid. In this case, the centering ring is located with a relatively small annular surface at the end face, so that on the centering ring, only a very low heat dissipation is derived. By centering the space between the end face of the front wall and the lid in two is divided from each other separate rooms, which brings more heat technical advantages.

p0056A further advantageous development of the subject matter in accordance with this second side issue arises when the lid circular linear spring rests with its outer circumference on the outer face of the hollow roll. Accordingly, a heat transfer between the hollow roll and the ambient air is very difficult on the lid and affects the heat distribution on the roller surface only insignificantly by a line contact between the hollow roll and the lid. Nevertheless, dirt particles and impregnating substances are effectively prevented from entering.

p0057A particularly simple mounting of the lid is realized when the lid is connected by an axial screw connection to the end face of the hollow roller. Alternatively, two or more screws are used. Advantageously, the lid is of such a nature that ensures that a desired contact force between the lid and the hollow roller comes about solely by the elasticity of the lid.

p0058To achieve a true running without the slightest imbalance in the subsequent operation of the draw roll, it is conceivable and possible in the simplest way to balance separately to cover the welded centering before mounting on the hollow roll of the draw roll.

p0059For example, the cover is made of chrome steel. (There may be a cheaper metal material may be used if the surface of the cover is coated). After applying a coating a less high-quality material is resistant to moisture and possibly. In Filamentbearbeitung used impregnation liquids.

p0060The third side aspect refers to arrangements to simplify the composition of the assembly and thereby to avoid damage. This aspect of the invention relates to a heatable galette for receiving filament with a cantilevered shaft on which averted from the bearing end an end wall is attached to the a radial distance from the shaft is arranged extending parallel to the shaft hollow cylinder, so that a heating device receiving a annular space is formed by the shaft, the end wall and the hollow roller, a conical section of the bearing point remote from the shaft end is brought into surface contact with an integrally formed on the end wall of the hub.

p0061For supporting the hollow roll a godet on a drivable shaft, it is known and common practice to connect the call via a cone and a correspondingly designed, integrally formed on the end wall of the hollow roller hub and to screw the end wall on the end face of the shaft.

p0062Although the hub and shaft could theoretically also be designed purely cylindrical, conical connections are typically selected that provide benefits for the sake of accuracy. For example, can be in the use of a conical connection, which is naturally zero backlash, achieve good runout; This applies in any temperature range.

p0063shown in known galette of this type, such as described in US Patent 3,772,492, but must be used very carefully in the assembly to avoid damage to the cone. Even minor damage to the cone to make the desired benefits completely distorted, favoring unbalances and vibrations and make assembly more difficult.

p0064The present invention has therefore set itself in this third sub-aspect the task of a heatable godet the mentioned type in such a way that the assembly of the end wall on the shaft is simple to carry out and damage the cone are almost impossible.

p0065According to the invention, this object is achieved in that the conical section of the shaft end is bounded by two cylindrical portions, said the depository far, has cylindrical end of the shaft of a smaller diameter than the shaft in the region of the bearing point. In this way the draw roll is first performed during the assembly by the cylindrical portion at the shaft end before the tapered portion comes into play. To an advantageous embodiment of the invention the object is achieved if a rotation is provided between the hollow roller and the shaft. It is therefore excluded in the simplest manner that the cone slips and possibly solves the axial screw connection between the shaft and the end wall. This screw connection should not be formed on the cylindrical guide surface.

p0066As already mentioned must be worked very carefully with a cone part, since even small damage - apart from an undesirable notch effect - can lead to significant imbalances. With regard to a damage-free mounting of the end wall on the shaft it is therefore advantageous to move the cone toward the bearing of the shaft, so that the conical portion is provided approximately in the center of the hollow roller. In such an embodiment, the support tube, on which sits the laminated core of Induktorkörpers shortened and can not be supported over its entire length to Induktorkörper.

p0067The present invention has therefore set itself in a fourth secondary aspect to the task, with simple means to design an arrangement of the aforementioned type such that even with a shortened pylon sufficient stability is ensured.

p0068According to the fourth aspect of the invention is solved this problem in that the sheets of Induktorkörpers are tightly coupled and joined together by welds. In this way, laminated cores with a high intrinsic stability, so readily a truncated supporting tube can be used, which leads directly to a reduction of the total weight of the draw roll unit.

p0069In a specific embodiment according to this fourth sub-aspect, is provided in an advantageous manner that the sheets of Induktorkörpers parallel to and offset from one another radially. This sheet package accordingly has a certain number of mutually equal plates which are connected together by weld seams. With regard to favorable magnetic properties, it has proven particularly advantageous, the sheets of Induktorkörpers at the end faces and on the inner sides to be welded together. With such a structure of the laminated cores results in a high packing density of the sheets, which in turn leads to an excellent magnetic conductivity.

p0070An advantageous embodiment of the subject matter according to the fourth side aspect provides that the ends of the laminated cores are received in grooves of a support body, thus resulting in a low magnetic resistance between said parts.

p0071Furthermore according to the invention it is provided that the Induktorkörper consists of several laminated cores which are arranged radially around the pylon. The laminated cores are again equal.

p0072It has proved advantageous in the construction of an expanded role with an inductor coil and sheet packs for manufacturing reasons and in view of the lowest possible total weight of the draw roller unit when the inductor coil is wound from an aluminum conductor. By contrast, the laminated cores are made of steel sheets having good magnetic conductivity.

p0073With such a structure therefore must be accepted that the various materials undergo different measure changes when the temperature changes, so must be provided at appropriate locations expansion joints between the inductor coil and the laminated cores.

p0074On the other hand there is a demand, the inductor and consisting of laminated cores Induktorkörper securely and firmly in the peripheral annulus of the galette to arrange and attach to, this requirement is in every possible operating temperature of the galette.

p0075The present invention is thus, in a fifth aspect, the addition object in such a way with structurally simple means Galettenheizung said genus that the inductor is mounted shock proof and safe and thermal expansions have no harmful effect.

p0076According to the invention, this object is achieved in that the inductor coil is positioned radially and axially resilient in the peripheral annulus. In such a configuration is thus achieved in an advantageous manner that caused by thermal expansion Mass changes of the inductor coil can be readily taken up by them supporting spring elements. Even relative dimensional changes between the inductor and the Induktorkörper are completely harmless. Thus, while the advantage arises from such storage of the inductor that changes in length are taken up by the resilient fastening members, on the other hand at the same time the advantage that the dimensional specifications for the inductor and for the Induktorkörper no longer have to be so precise. By less high demands in terms of dimensional accuracy a cheaper manufacture is possible.

p0077To an advantageous embodiment of the invention the object is achieved if at least one axial annular face of the inductor coil is supported on one or more spring elements. With axial length changes of the inductor the values ​​present at their spring elements are more or less compressed, any harmful forces occur without the spool or in the adjacent machine parts.

p0078, when a circumferential surface of the coil is supported at one or more spring elements, so that radial dimension changes of the inductor coil are compensated due to thermal expansion by corresponding changes in position of the spring elements and expansion stresses are effectively avoided is particularly advantageous.

p0079If the inductor is suspended in the manner described resiliently in the interior of the Galette, as well as a secure holder in Galette is assured in spite of all advantages achievable thereby. For the inductor coil, the spring elements serve simultaneously as a vibration damper, which excludes as much as possible during operation of the godet vibration induced damage to the coil winding.

p0080Structurally particularly simple and advantageous is to use as a spring element for axial support of the inductor a plate spring having a central opening, which bears circle linearly on the axial annular surface of the inductor. By a single spring element that is, a uniform axial force is exerted on the inductor. A tilting of the coil is almost impossible.

p0081For resilient support of the inductor coil in the radial direction, a radial gap for receiving spring elements is provided between the inductor coil and the Induktorkörper. These spring elements are preferably designed as a flat spring plates and support radial expansions of the inductor to readily, while ensuring a secure and vibration resistant fixing. Although it is theoretically quite sufficient to store a coat of inductor by a single spring element, a plurality of spring elements with a constant angular distance to each other are brought into contact with the coil in a preferred embodiment. Particularly advantageous with respect to a central position of the inductor coil, it is advantageous to use as spring elements elongate sheets which contact the coil over its entire length.

p0082In a sixth side aspect, the invention relates more particularly to a heated godet. In a first sub-aspect treated an arrangement for measuring the temperature of moving machine members, in particular for rotating jacketed draw rolls in the Filamentbearbeitung in which a sensor with a temperature-dependent actual value is thermally coupled to the draw roller, in which a largely by the stretching roll and a stationary housing closed cavity is limited and in which the sensor is mounted stationarily on the housing and projects into the cavity.

p0083Such stretch rolls known to work with relatively high speeds at operating temperatures of up to 250 degrees Celsius. In view of the uniformity of the final product, it is absolutely necessary to detect the particular temperature of the stretching roll in order to optionally influence on controlling the heating of the stretching roller can.

p0084To measure the temperature of stretching rolls in operation, it is known, the roller casing sensors, for example PT 100 resistors, install, which in turn are installed in tubes. The tubes are made on the front side of the draw roll radially inward and unite in the center in a thicker tube. The thicker tube inserted into a hollow-built motor shaft and ends at the back of a Triaxialstecker. The male coupling is attached to the rotating part of the transmitter's, sitting on the rear shaft end. The stationary part of this purely inductively operating data transmission system, the stator is attached to the terminal housing.

p0085The measured value transmitter generates a frequency inversely proportional to the measured temperature. This electrical signal is transmitted via ordinary lines to the controller and the actuator. Such measuring systems are very accurate and have been proven in operation in many cases. However, the basic design of this measuring system is relatively complex and costly due to the use of inductive measurement transformer.

p0086It is also an arrangement for temperature measurement are known in the facing on one of the bearing of the shaft end side of the draw roll a more or less elongated radial groove is formed. In cooperation with a correspondingly shaped carrier body is formed in this way, a circumferential annular space, free from intrusions on a fortified stationary support body sensor.

p0087Although such a construction has the advantage that a complex measurement value transformer is unnecessary, but only one mixing temperature will ultimately be measured which is influenced by the normally relatively high temperature of the stretching roll and on the relatively low temperature of the carrier body. In this known arrangement, it is also less than regarded advantageous that the sensor used for temperature detection is unprotected in the annular space and can be easily damaged or destroyed in a Into the thread is passed into the annular space.

p0088The present invention has therefore set itself in this specific aspect of the sixth sub-aspect the task to create an arrangement according to the preamble of the sixth sub-aspect, which is characterized by a simple structure, safe in operation and detected respectively accurately as possible the actual temperature of draw roll ,

p0089According to this specific aspect is solved this problem by the fact that at least on one end face of the draw roll a self-contained groove is formed for receiving the probe. The groove is dimensioned such that it is almost completely filled by the probe used. The open end of the groove by the base carrying the probe as far as possible closed, so that the sensor is subjected almost exclusively to the prevailing temperature in the groove and only the stretching roller temperature is measured very accurately. The influence of disturbances, such as the temperature of the carrier body and the ambient temperature is largely eliminated.

p0090To a particularly advantageous embodiment of the invention the object is achieved if the probe is brought out as a pin from a sleeve-shaped base, wherein the cross section of the base is larger than the cross section of the groove, and on the base two pin including an air gap be reinforced tabs are integrally formed, the partly engage in the groove of the draw roll. Where the yarn to be processed but, exceptionally, even in the annular groove, so mechanical stresses are taken up by the fixed sleeve material, so that damage to the relatively delicate sensors are excluded.

p0091An advantageous development of the transducer provides that the pen over the axial end faces of the tabs protrude. The reinforcement of the pin through the loops so extends only as far as necessary to protect the stylus from damage. The actual sensor at the end of the pin is free of any reinforcement and is protected against damage by the groove itself, since the pin end with low axial and radial play into the groove. ie In such a configuration, it is possible to form the pin so that the thermal transition behavior is very low and temperature fluctuations with a possible slight delay time are recorded.

p0092It is furthermore particularly advantageous if the pin relative to the base is thermally insulated. This can be achieved in a simple manner by a thermal insulator between the pin and the sleeve-shaped base. If a casting compound with the appropriate properties is used as the insulator, can to a further mechanical attachment of the St be dispensed iftes.

p0093For technical reasons, it is particularly simple and advantageous if the groove has a rectangular cross section. If the length of the pin made by a vertical section, the result is a very good adaptation of the contours between the end face of the pin and the groove bottom.

p0094In a second sub-aspect of the sixth sub-aspect, the invention deals with an arrangement for measuring the temperature of a galette for Filamentbearbeitung, wherein a jacket wall is connected via an end wall with a set into rotation shaft, in which a stationary heater is disposed in an interior of the godet and in which a temperature sensor is provided for detecting the internal temperature of the godet.

p0095In a known Galette of this type the gas located in the interior is heated by the stationary heating device and swirled during rotation, so that there is a homogeneous temperature throughout the interior, which is detected by a projecting into the interior probe. The prevailing temperature at the sensor corresponds to but not exactly the temperature of the casing wall, but corresponds to a mixing temperature which is dependent on the temperature of all defining the interior parts.

p0096The present invention has therefore set itself in this second sub-aspect of the task, an arrangement of the aforementioned type with structurally simple means in such a way that the temperature sensor is exposed as possible to the respective temperature of the casing wall of the galette.

p0097This task can in the second sub-aspect be solved that a pump for generating an air stream along the heater and the casing wall is provided, where the airflow prior to exiting the galette is led past the temperature sensor. In such an embodiment results in a simple and advantageous manner that ambient air is by the pumping action during rotation of the godet sucked into the internal space and flows past the stationary heating device and the casing wall and flows past directly from escaping to atmosphere at the temperature sensor, so that the temperature the probe largely the temperature of the shell wall corresponds with a cooling of the stationary heating device takes place.

p0098It is structurally particularly simple and advantageous to produce a pumping action on the inside of the disc-shaped end wall are formed radially outwardly extending blades that move with the respective shaft speed through the interior of the galette.

p0099Advantageously, the interior space is connected via an annular gap between the shaft and an integrally formed on a support body supporting tube with the atmosphere and formed between the surface of the casing wall and an annular projection of the support body, an annular gap, through which a connection between the interior and the atmosphere is produced. In this way, the air flow is throttled immediately prior to leaving the galette.

p0100With a view to an accurate temperature measurement of the temperature sensor is advantageously arranged in the flow direction directly in front of the annular gap. It is further provided that a throttle point is formed by an annular projection on the arm so that the air drawn into the interior air is limited and the air flow relatively slowly through the galette.

p0101With such configured godet unit is therefore clear that the air flow to the interior due to the throttling point by flowing relatively slowly, wherein the heating device is cooled and the air stream itself is heated, so that the prevailing at the temperature sensor temperature is not significantly changed. As a result of the restriction, the air drawn into the interior air quantity is small, so get in a correspondingly low mass contamination in the interior. Due to the low flow velocity, it is ensured that the air flow has almost reached the temperature of the casing wall at the sensor. The air exiting the air Galette also prevents debris from entering the interior.

p0102Examples of arrangements according to different aspects (main, additional and ancillary aspects) of the invention will now be described with reference to other figures of the drawings, wherein show:<ul><li><u>Figure 3</u> A draw roller unit in accordance with Fig. 2C with a bearing assembly according to the second additional aspect between a galette schematically illustrated and an electric motor drive,</li><li><u>Fig. 4</u> a section through the bearing arrangement of Figure 3, according to the dotted line A -. A, the latter figure,</li><li><u>Fig. 5</u> a sectional view of a bearing assembly according to the first Zusatzanspekt for use in a draw roller unit according to one of the variants shown in Fig. 2,</li><li><u>Fig. 6</u> an embodiment of the first sub-aspect of the invention, </li><li><u>Fig. 7</u> In addition to an embodiment of the second aspect of the invention,</li><li><u>Fig. 8</u> an embodiment of the third sub-aspect of the invention.</li><li><u>Fig. 9</u> a simplified Galettenheizung average,</li><li><u>Fig. 10</u> a section through the Galettenbeheizung of Figure 9 along the dotted line A -.. A in Figure 9,</li><li><u>Fig. 11</u> a laminated core in a perspective view,</li><li><u>Fig. 12</u> a longitudinal section through a further simplified Galettenheizung,</li><li><u>Fig. 13</u> a cross section through the Galettenheizung of Figure 12, along the dotted line A -.. A in Figure 12,</li><li><u>Fig. 14</u> a longitudinal section through a godet with a sensor,</li><li><u>Fig. 15</u> a sensor in a perspective view and</li><li><u>Fig. 16</u> a longitudinal section through an alternative galette with a sensor.</li></ul>

p0103In Fig. 3 and 4, corresponding parts have the same reference numerals to each other.

p0104In the principal sectional view of FIG. 4 is a bearing housing 1 between a galette schematically shown 2 and an electric motor 3. In the bearing housing 1 are four roller bearings 4, 5, 6, 7 provided for supporting a shaft 8. Two bearings 4, 5 and 6, 7 are arranged parallel to each other and are located in the axial end portions of the bearing housing 1. The roller bearings 4, 5, 6, 7 are wire mesh 9 is supported radially on the bearing housing 1 so that shaft vibration during operation of the Galette 2 are effectively damped.

p0105The Galette 2 essentially consists of a cylindrical outer wall 10 which is open at one end and closed at the right end in the drawing by an end wall 11th On the end wall 11 a hub 12 is integrally formed, in which a cone-shaped end portion 13 of the shaft protrudes 8, wherein the shaft 8 is connected by means of a screw 14 axially to the end wall eleventh Due to the cylindrical jacket wall 10, the disk-shaped end wall 11 and the shaft 8, a circumferential ring space 15 is thus formed, in which a stationary heater 16 is housed. The stationary heater 16 is attached to the housing 2 of the godet roll 17, which is in turn flanged to the bearing housing 1 and secured by screws 18 to the bearing housing first

p0106The section shown in Fig. 4 along the dotted line AA of FIG. 3 shows a comparison with FIG. 3 on an enlarged scale, an embodiment with a ball bearing 19, through which the shaft 8 is passed and which is radially outwardly supported on a wire mesh 9, wherein the wire mesh 9 is provided as a composite of a plurality of ring segments 20 ring body; between the ring segments 20 gaps 21 are provided.

p0107In FIG. 5, 31 designates a shaft which is displaceable, for example, by an unillustrated electric motor drive in rotation, wherein the rotational direction of the shaft 31 is not of importance. On the shaft 31 is seated a ball bearing 32, which consists essentially of an inner bearing ring 33, an outer bearing ring 34 and arranged between the bearing rings 33, 34 rolling elements 35th

p0108The ball bearing 32 sits in turn in a press fit in a bearing bush 36 which has an L-shaped cross section substantially, the bearing bush 36 has a diameter such that between the bearing bush 36 and the shaft 31 a gap 37 and a contact of the above parts 31, 36 is excluded.

p0109The outer radial boundary surface of the bearing bush 36 is supported via two O-rings 38, 39 on a housing 40 so that the housing 36 and 40, a circumferential gap is formed between the outer radial boundary surface of the bearing bush 41st The two O-rings 38, 39 are arranged at a predetermined radial distance from each other, whereby a circumferential annular space 42 is formed, for example, is connected to a source of pressurized oil, not shown. To this end, suitable bores (not shown) are provided in the housing 40th is for the embodiment shown between the left in the representation end face 43 of the bearing bushing 36 and the housing 40 is also a gap exists. From this end face 43 is further from a circumferential groove 44 in which the central portion 45 of a spring pin 46 is situated. The ends 47, 48 of the spring pin 46 are anchored in the housing 40 and in the bearing bush, the spring pin 46, for example, coaxial with the shaft 31 is located. To anchor the ends of the spring pin 46 36 holes 49, 50 are provided in the housing 40 and the bearing bush, in which the spring pin 46 is pressed with its ends 47, 48th Instead of the circumferential groove 44 blind holes may as well be provided in the bearing bush 36th

p0110In operation of the described system, according to FIG. 5, consisting of an uneven running of the shaft 31 following vibrations on the bearing bush 36 are transmitted. The O-rings 38, 39, the spring pins 46 and trapped in peripheral annulus 42 pressurized oil however ensure that the vibrations are transmitted only strongly attenuated in the housing 40th The running of the shaft 31 is a total calm, which immediately reduced bearing stress occurs.

p0111In the illustrated in Fig. 6 is an axial section of a simplified godet 61 with a stationary housing, indicated with a rotationally symmetrical carrier body 62 is connected. On the support body 62 extending in the axial direction of the support arm Galette 63 is formed, which is provided with a central hole 64th Through the bore 64 of the support arm 63 a shaft 65 is passed, which is connected via two bearings 66, 67 with the carrier body 62nd

p0112Between the radially inner boundary of the support arm 63 and the shaft 65, a gap 68 is present, which prevents contact between said parts 63, 65th

p0113The bearings 66,67 opposite end of the shaft 65 is formed as a radially outwardly extending end wall 69, on the circumference of a roller shell 70 is molded. The roller shell 70 together with the end wall 69 open on one side hollow cylinder which can be rotated through the centrally arranged shaft 65th

p0114An inner end face 71 of the end wall 69, the roller shell 70, a the bearings 66, 67 facing away from front surface 72 of the carrier body 62 and the support arm 63 define an annular space 73 in which a heater is disposed 74th In operation, the Galette, the shaft 65 is switched on heater 74 is rotated, so that along the dotted line S, a flow of heated air or gas is adjusted by the blades 75 in the annulus 73, which moves in the direction indicated by the arrow K and the roller casing 70 heats to the desired operating temperature.

p0115The outer face of the end face 69 is provided with circumferentially distributed threaded holes 77, in the balance weights are not shown screwed. The threaded holes 77 are coaxial with the shaft 65th

p0116The left end in the illustration of the roller shell 70 has an annular bead 78 having an enlarged diameter, in turn, are introduced 80 for receiving balance weights threaded bores 79th While the threaded holes 79 are arranged in the upper part of the display, for example, coaxial with the axis of the shaft, close the axes of the threaded bores 80 an angle α with the shaft axis a.

p0117In the godet shown in simplified form in FIG. 7 is provided with a stationary housing 91, indicated with a rotationally symmetrical carrier body 92 is connected. On the support body 92 a to erstrekkender axially of the Galette arm 93 is formed, which is provided with a central hole 94th Through the bore 94 of the support body 92 a shaft 95 is passed, which is connected via two bearings 96, 97 with the carrier body.

p0118Between the radially inner boundary of the support arm 93 and the shaft 95, a gap 98 is present, which prevents contact between said parts.

p0119The bearings 96, 97 facing away from the end of the shaft 95 is designed as a radially formed outwardly extending end wall 99, on the circumference of a roller shell 100 is formed. The roller shell 10 forms together with the end wall 99 a one-sided open hollow cylinder, which is displaceable through the centrally disposed shaft 95 in rotation.

p0120An inner face 101 of the end wall 99, the roller shell 100, a the bearings 96, 97 facing away from end surface 102 of the carrier body 92 and the support arm 93 define an annular space 103 in which a heater is disposed 104th In operation, the galette shaft 95 is mixed with activated heater 104 in rotation, so that along the dotted line S, a flow of heated air or gas set in the annular space 103, which moves in the direction indicated by the arrow K and the roll shell 100 heats to the desired operating temperature.

p0121The outer face 106 of the end wall 9 is provided with circumferentially distributed threaded holes 107, into the Auswuchtsgewichte not shown are screwed. The threaded holes 107 are coaxial with shaft 95th

p0122To measure the surface temperature of the drafting roller in operation are located at the roller shell 100, two sensors 108, 109, (eg PT 100 resistors), which in turn are installed in tube 110, 111th The tubes 110, 111 are guided in the end wall 99 of the draw roll radially inward and unite in the center in a thicker tube 112. The thicker tube 112 inserted into the hollowed-out shaft 95 and terminates in the rear part in a Triaxialstecker who made the presentation is not apparent.

p0123On the end face 106 of the draw roll, a lid 113 is on, which is formed as a rotationally symmetrical sheet metal part. The cover 113 has a central centering 114 which is independent of the lid 113 made on a lathe and welded after the completion of both parts on the lid 113th Through the centering ring 114, the space between the end face 106 of the end wall 99 and the lid 113 in two separate chambers 118, divided 119th The centering ring 114 is radially fixed by a recess 115 on the front wall 99th By an axial screw 116, 117 of the lid 113 is connected to the end wall 99 of the draw roll.

p0124In FIG. 8, shown simplified godet 12 is provided with a cylindrical outer shell wall 122 referred to coaxially an inner cylindrical jacket wall 123 is arranged, wherein the casing walls 122,123 are held by an annular insert 124 in the desired radial distance from one another. The casing walls 122,123 are joined together at the right end side in the diagram by a common disc-shaped end wall 125th The central region of the end wall 125 is formed as a hub 126, which receives both the cylindrical end 127 of a shaft 128 as well as its conical portion 129th The cylindrical end portion 127 of the shaft 128 forms with a corresponding inner surface of the hub 126 a clearance. Furthermore, the hub 126 has a conical section which abuts the shaft 128 at the conical section 129th

p0125Through the shell walls 122,123, and the disk-shaped end wall 125 is a closed-end hollow roll is formed in the central shaft 128 is arranged, the shaft 118 extends through the interior 130 of the hollow roller and an opening 131 in a machine frame 132 to a storage not shown , On the machine frame 132 a stationary heater is fixed 133 and protrudes axially into the cylindrical inner space 130 between the inner casing wall 123 and the shaft 128 inside. The disk-shaped end wall 125 is secured by a bolt 134 to the cylindrical end portion 127 of the shaft 128th

p0126On the front wall 125, a first balancing ring 135 by screws 136, which are guided in bolt holes 137, attached. A cylindrical centering recess 138 to the end wall 125 serves to center of the first balancing ring 135th

p0127The first balancing ring 135 is provided with threaded holes 139 for receiving balancing weights 140th For covering the threaded holes 139 a lid disc 141 by means of two screws (not shown), fastened to the first balancing ring 135th To accommodate these screws the first balancing ring 135 is provided with threaded holes 142nd

p0128A second balancing ring 143 is provided on the machine frame 138 facing the end of the outer jacket wall 122nd The second balancing ring 143 is located with an interference fit on a cylindrical surface 144 of the outer sleeve 122 and is secured in the machine frame is directed against the axial direction 130 by a web 145th To safeguard against rotation of the second balancing ring 143 has a directed against the machine frame 130 nose (not shown) that fits into an opening provided in the web 145 recess (not shown). The threaded holes 146 on the second balancing ring 143 are used for receiving threaded balance weights 147, so-called grub screws.

p0129For covering the threaded holes 146 on the second balancing ring 143, a lid 148 inserted in the second balancing ring 143 and by means of two screws (not shown) attached thereto. For receiving the screws 143 screw holes 149 are provided in the second balancing ring. By press-fitting the second balancing ring 143 on the outer lateral wall 122 of the second balancing ring 143 is centrally guided on the outer jacket 122nd

p0130The invention has been previously described, for example, based on heated godets; but the various aspects are readily applicable even when stretching rollers in which a heating is not provided.

p0131Basically, Figs. 3, 4 and 5 are two solutions (Additional aspects) which can be used in the main aspect of the invention. Fig. 6 to 8 each show a side aspect, which each advantageously in an aggregate, can be applied according to the other aspects. The combination of all these side issues to the main aspect of a particularly Effective and advantageous embodiments. The other versions are specifically designed for heated galettes.

p0132In FIGS. 9 to 11 are corresponding parts provided with the same reference numerals.

p0133In Fig. 9 is provided with a cylindrical outer shell wall 201 referred to coaxially an inner cylindrical jacket wall 202 is arranged, wherein the casing walls 201, 202 retained by an annular insert 203 in the desired radial distance from one another. The casing walls 201, 202 are connected together at the right end side in the diagram by a common disc-shaped end wall 204th The central region of the end wall 204 is formed as a hub 205, which receives both the cylindrical end 206 of a shaft 207 as well as its conical portion 208th

p0134By the circumferential walls 201, 202 and the disk-shaped end wall 204 is a closed-end hollow roll is formed in the central shaft is arranged 207, said shaft 207 to a not shown through the interior 209 of the hollow roller through an opening 210 in a machine frame 211 bearing covers. On the machine frame 211 a stationary heater is fixed 212 and protrudes axially into the cylindrical inner space 209 between the inner casing wall 202 and the shaft 207 inside. The disk-shaped end wall 204 is secured by a bolt 213 to the cylindrical end portion 206 of the shaft 207th

p0135On the front wall 204, a first balancing ring 214 by screws 215, which are guided in bolt holes 216, attached. A cylindrical centering recess 217 to the end wall 204 serves to center of the first balancing ring 214th

p0136The first balancing ring 214 is provided with threaded holes 218 for receiving balancing weights 219th For covering the threaded holes 218, a cover plate is fixed by two screws 220 (not shown) on the first balancing ring 214th To accommodate these screws the first balancing ring 214 is provided with threaded holes 221st

p0137A second balancing ring 222 is provided on the machine frame 217 facing the end of the outer lateral wall two hundred and first The second balancing ring 222 is located with an interference fit on a cylindrical surface 223 of the outer sleeve 201 and is secured in the machine frame is directed against the axial direction 211 by a web 224th To secure against rotation, the second balancing ring 222 directed against the machine frame 211 nose (not shown) on which (not shown) fits into an opening provided in the web 224 recess. The threaded bores 225 on the second balancing ring 222 serve to receive a threaded balancing weights 26 for covering the threaded holes 225 on the second balancing ring 222 is a cap 227 recessed into the second balancing ring 222 and, (not shown) by means of two bolts attached thereto. For receiving the screws 222 screw holes are provided in the second balancing ring. By press-fitting the second Auswuchtringes 222 on the outer lateral wall 201 of the second balancing ring 222 is centrally guided on the outer jacket two hundred and first

p0138Of Fig. 9 can also be seen that the stationary heater 212 is composed of laminated cores 228 and an inductor 229, wherein the sheet packages 228 are arranged on a supporting tube 230th

p0139In Fig. 9 an embodiment is shown, are arranged in a total of six bundles of laminations 228 in an equal angular distance from one another on the supporting tube 230th According to FIG. 9 are the machine frame facing away 211 faces of the core stacks 228 in grooves 235 of the cylindrical end wall 204.

p0140Next is a perspective view of a laminated core 228 is shown in FIG. 11, seen from the that a lamination stack 228 consists of a plurality of individual sheets 234, which are connected by welds 231, 232 on the inside and welded seams 233 at the end faces with each other. The plates 234 are arranged to each other, that the outside and the inside of a laminated core have a radial offset equal radii.

p0141In Figs. 12 and 13 corresponding parts with the same reference numerals to each other.

p0142In Fig. 12 a heatable godet roll 241 is shown in section, in which an end wall 243 is fixed on a cantilevered shaft 242. For this purpose, on the end wall 243 has a central hub 244 integrally formed, into which a conical portion 245 of the shaft 242 extends and is secured by a screw 246th The shaft 242 is guided on a bearing assembly, not shown, on which the screw 246 and distal end displaceable by a not shown on the illustration of the electric motor drive in rotation.

p0143The radially outer region of the disc-shaped end wall 243 continues in a casing wall 247, so that by the end wall 243 and the outer wall 247 a unilaterally closed hollow cylinder is formed, which can be rotated with the shaft 242nd

p0144The inductor 241 is flange-mounted on a carrier body 248 of the bearing assembly, not shown, wherein the support body 248 has a hollow cylindrical support arm 249th In the support arm 249 is including a radial gap 250, the shaft 242 with the attached hub 244th

p0145On the peripheral surface of the support body 249 a Induktorkörper 251 is arranged, which is formed of a plurality of radial plates. The sheets of Induktorkörpers 251 extending longitudinally over the entire support arm 249 and are at their ends to Induktorflanschen 252, 253 of which are in turn composed of individual magnetically conductive sheets. The sheets of Induktorflansche 252, 253 are perpendicular to the sheet of Induktorkörpers 251 and extending radially outward up to the vicinity of the cylindrical wall 247. Between the lateral wall 247 and the ends of Induktorflansche 252, 253 are formed as low as possible air gaps.

p0146The substantially annular Induktorkörper 251 is surrounded by a circular inductor 254th The dimensions of the Induktorkörpers and the inductor are selected so that a gap 255 forms between the said parts 251, 254, are disposed in the spring elements 256 such that the inductor coil is held resiliently in a radial distance from the Induktorkörper 251st If now due to temperature fluctuations, different strains of the body 251, 254, these dimensional changes are recorded without any further by the spring elements 256th The spring elements 256 are thereby compressed more or less, altering the radial distance between the bodies 261, 254th

p0147The in the representation of FIG. 12 left end face of the inductor coil 254 is subjected to a force by a spring element 257, which is clamped by a clamping body 258, for example at 252 Induktorflansch firmly. The spring element 257 is under tension to at the inductor coil 254, and changes its shape and voltage as a function of the expansions of the coil 254th

p0148In operation of the godet of FIG. 12, the shaft 242 is rotated and the inductor coil 254 connected to an AC voltage, so that in Induktorkörper 251 and in the Induktorflanschen 252, 253, a magnetic flux is produced, caused by the in the mantle wall 247 eddy currents, who finally heating the casing wall 247 to follow. Due to the surface roughness of the inner periphery 258 of the disc-shaped end wall 243 is created in the interior of the godet roll 241 a pumping action, which has a flow of air 251 along the dotted line S to the sequence. The heated air flows through the annular gap 259 and eventually leaves the godet roll 1 through an annular opening 260th

p0149In operation, the Galette 241 caused by load changes, speed changes and imbalances vibrations that come through the use of spring elements only in greatly subdued extent to inductor 254 and in any case can not cause any damage.

p0150Fig. 13 shows a simplified Galettenheizung 241, wherein for example, three spring elements 261, 262 are housed in the intermediate space 255, with a spring element 262 is shown for illustration in the untensioned state. Between the spring elements 261, 262 are also provided here for thermal] considerations interstices 263rd

p0151In the variants according to FIGS 14 and 15 are again mutually corresponding parts are provided with the same reference numerals.

p0152In Fig. 14 is provided with a stationary housing 271, indicated with a rotationally symmetrical carrier body 272 is connected. On the support body 272 extending in the axial direction of the support arm Galette 273 is formed, which is provided with a central bore 274th Through the bore 274 of the carrier body 272, a shaft 275 is guided, which is connected via a bearing 276 to the carrier body 722nd

p0153Between the radially inner boundary of the carrier arm 273 and the shaft 275, a gap 278 is provided which prevents contact between said parts 273, 275th

p0154The camp 276 opposite end of the shaft 275 as a formed radially outwardly extending end wall 278, at the periphery thereof a roller shell is 279 formed. The roller shell 279 together with the end wall 278 a unilaterally open hollow cylinder which can be rotated through the centrally arranged shaft 275th

p0155An inner face 280 of the end wall 278, the roller shell 279, a bearing 276 which faces away from the end face 11 of the carrier body 272 and the support arm 273 define an annular chamber 282 in which a heater is disposed 283rd In operation, the Galette, the shaft 275 is switched on heater 283 is rotated, so that along the dotted line S, a flow of heated air or other gas set by blades 284 in the annular space 282, extending in the direction indicated by the arrow K moves and the roller shell 279 heats to the desired operating temperature.

p0156The left in the representation of the end of the roller shell 279 is ringwulstartig extended radially, wherein the annular ring 286 with correspondingly shaped surfaces 287 of the support body 272 a gap 288 is formed, escapes through the in accordance with the dot-dash line S a partial air stream from the annular space 282 to the outside. The axial end face 289 of the annular ring 286 is provided with a groove 290 having a rectangular cross-section and receives a pin 291, which forms a temperature sensor, together with a sleeve-shaped base element 292nd The temperature sensor has connecting lines 293 and is located in an axial bore 294 of the carrier body 272. About an inserted into a threaded bore 25 of the support body 272 screw 296 is fixed the base member 292 in the axial direction.

p0157The perspective view shown in FIG. 15 of the temperature sensor 291, 292 shows that the sleeve-shaped base member 292 two pin 291 be reinforced tabs 297 formed, the tabs 297 to pin 291 surrounded only about half the side. Between the flaps 297 and the pin 291, an air gap 298 is formed. The connecting lines 293 facing portion of the sleeve-shaped base member 292 is filled with an insulating compound in the display can not be seen, is caused by both the thermal insulation and the mounting of the pin 290th Additional insulation can outside of the base member 292 are attached.

p0158In the illustrated in Figure 16 simplified Galette 301 a relocatable in rotation shaft is denoted by 302, the left in the drawing end is coupled via a non-illustrated bearing arrangement with an electric motor drive, not shown. The right in the representation of the end of the shaft 302 has a cone-shaped portion 303 which is received in an integrally formed on a disk-shaped end wall 304 hub 305th By means of a screw 306, the end wall 304 and the shaft 302 in the axial direction together.

p0159On the disc-shaped end wall 304 includes a jacket wall 307 is integrally formed on the outer circumference, which consists of an inner roller shell 308 and an outer roller shell 309th The jacket wall 307 extends coaxially with the shaft 302 so that the shaft 302, the end wall 304 and the casing wall 307 closed at one end, is formed to the bearing hollow body open, in its annular interior 310 a stationary heating device 313 is housed substantially is annular and is located on a support tube 311, the support tube 311 is part of a support body 312 and the shaft 302 receives with a slight radial play. The stationary heating device 313 consists of a seated on the support tube 311 Induktorkörper 315, which is preferably formed as a laminated core. The laminated Induktorkörper 315 surrounds an inductor 314, which is wound, for example, of a relatively thick aluminum ladder. Between the inner roller shell 308 and the outer roller shell 309 of the side wall 307, a narrow circumferential annular space 316 is formed, in which a vaporizable liquid is.

p0160On the bearing side end of the shaft 302 a ring nose 317 is formed, while an annular projection 318 on the support body 312 forms an annular gap 319 with the peripheral surface of the outer roller shell 309th On the inboard face of the disc-shaped end wall 304 air vanes 320 are integrally formed, which cause a 302 indicated by the dashed line S in the air flow indicated by the arrows P in the direction of rotation of the shaft.

p0161This ambient air enters an annular gap 321 between the support member 312 and the shaft 302 in the galette 301 and flows through the annular nose 317 on the entire length of the stationary heater 313 by a temperature sensor 322, which is firmly seated in the carrier body 312 and, for example, a PT -100-resistance. Here the temperature of the heated air flow is measured, before the air stream is again throttled and through the annular gap 319 leaves the godet three hundred and first The air sucked flows directly from the environment and not by the bearing for Wlle 302 - so there is no any Schmiermittelverschutzung.

p0162During the relatively slow flow of air moves past in the illustration to the left on the stationary heater 313 and thereby heats, the trapped in peripheral annulus 316 medium ensures through evaporation and condensation processes for a uniform temperature over the entire length of the casing wall 307th