Device for processing a blank conveyed along a transport path at a predetermined transport speed

The invention relates to a device for processing a Along a conveying path with a predetermined conveying speed According to the preamble of claim 1.

The invention relates to a folding machine in a special embodiment For the manufacture of a folding container from a storage container, Conveying path with a predetermined speed Blanks, the middle part of which is laterally arranged Folding grooves on which side parts are seated By means of turning devices in the course of the conveying path from initially Spreading position, increasing along the folding grooves To the longitudinal center of the blank, and finally Are joined together from above and joined together.

Such devices, especially folding machines, are known (See, for example, the brochure "In-Line Machine 2000", Klett Corrugated Cardboard Machines, Remscheid or EP-A-388,649).

Within the scope of the present application the terms "device For processing along a conveying path Specified conveying speed "and "Folding machine" always used synonymously, since all the invention In such a device As well as in such a folding machine.

Although the present invention is generally of a folding machine For producing folding containers from flat material blanks , The present invention relates to more preferred Folding machines for the manufacture of folding containers Made of cardboard. In particular, as starting materials Corrugated cardboard blanks.

A limitation of the invention to cardboard blanks only From corrugated cardboard is, however, not intended be. Therefore, in the following, unless expressly stated in Other sense is pointed out, the materials corrugated cardboard, Folding carton, in particular the term Folding box also the general term folding container, provided the Folding container on a folding machine in the sense of this invention will be produced.

Folding carton blanks of this type consist, for example, of corrugated cardboard. For this purpose, a corrugated cardboard sheet parallel to the corrugated cardboard box is used Wave where the side flaps are hinged at the Middle section.

It is to be expressly stated that the present invention Also by no means on folding machines for the production of all-round Closed folding containers. Rather come also Folding machines for the production of sleeve - like folding containers in Consideration. These are, for example, protective covers without cover and / or Without floor. In such protective wraps, In such a way that the picked - Inside of the protective cover. By the omission of The floor and / or cover can be unintentional Slipping.

A practically relevant case occurs, for example, in the wrapping of Vehicle headlight reflectors. These reflectors Are usually introduced into corrugated sheathing. The inner dimension of the envelope is so narrow that the reflector Therein.

A further application example, as stated, is folding carton blanks, The one unwound cuboid crate with ground And cover.

Such crates are usually used on packaging machines Further processed. For this reason, the quality of the Folding machine is of particular relevance.

In this case, such a folding carton blank can also be provided with the required Slots or recesses. To this end The corrugated cardboard sheet in the region of the folding grooves is parallel to the longitudinal axis Shaft slit or splinted. The slot width is approximately E.g., 1 cm. The slot depth corresponds to the fold - in length of Floor or lid. The bottom and the lid of the folding carton are thus seated Freely movable on the remaining carton. Usually Three slots can be precisely cut out. A fourth slot Arises in the area of ​​the two together and together Side flaps to be connected. One of the two side flaps Additionally carries a so-called tacking edge or glue edge. It Is a flap, on which also a folding groove is provided.

The folding grooves form the hinges between the two Side panels and the middle section. Usually, for cuboidal Crates four folding grooves, at least on both sides of the middle part In each case a segmented groove and a segmented groove Within the middle part and a folding groove in the region of the Both folded side flaps.

In such folding machines, the pre-punched ones, if any, are now punched Blanks, while at the same time on the blanks With the prefabricated seam grooves which are still first Spread side flaps and in the course of the transport route Fold.

Folding is carried out in known manner by means of so-called Reversing straps that open the side flaps from below To take The reversing straps extend from one level below A plane above the central part. The axles of the reversing straps Are intertwined with each other in such a way that the folds of the folding carton blank Facing belt surface along the conveying path by a total of 180 degrees. Usually, therefore, on each Side of the middle part two such reversing straps one behind the other Arranged, of which each reversing belt only by 90 degrees . The problem on which the invention is based consists In that the internal dimensions of all the folding cartons of one on a Machine in as narrow tolerances as possible hold.

In the case where the folding cartons are parallelepiped boxes In which slit-like grooves are formed at the ends of the folding grooves Recesses, the result is the subordinate task, It is also possible to further develop the known folding machine in such a way that all Slot widths of a folding box with equally large dimensions Can be produced.

The object is achieved by the device according to claim 1 and the Method according to claim 25.

The invention provides an embodiment for achieving the object And a further development of this embodiment.

The embodiment is already based on line-shaped clamping Existing folding grooves with simultaneous inward pivoting movement Of the side parts (= folding station).

The further training is based on the production of non-existing ones Folding grooves by line-shaped clamping of the blank (= Creasing station) with downstream folding station.

The advantage of the invention is that, independently of Of the width of the fold groove for each side flap one in the millimeter range Accurately positioned and with the speed of the Cut with the cutting edge between Side door and middle section. With regard to the blank The machining is carried out statically according to this invention. This allows not only the harmful dynamic and Difficult to predict influences, but in addition To produce excellent qualities at great speed.

The distance between the two folding edges changes over the conveying path not. In the first embodiment, in addition to the line-shaped Tighten the blanket every side flap Inside folded.

The edges of the folds offer from the outside by means of, for example, the Reversing straps swung sideways to the folded Area from the inside supporting guide, at the millimeter-exact The pivoting movement is forced.

The invention makes use of the fact that such corrugated cardboard blanks In relation to the basic dimensions of the Cut - always be folded at matching points. However, these folding grooves have a certain width, for example Of about 1 cm. The width of the groove is the width Width in the blank, which are usually characterized by so-called Pre-crimping rollers. Here the blanks are cut Into the gap between opposing rollers. These Rolls have a narrowest distance from one another, which is less Than the blank thickness. The blank is thus crushed, For the subsequent attachment of the seam groove To be prepared. This creates a certain one Folding area, in which the actual hinge axis .

Consequently, this was so far due to the internal structure of such Corrugated cartons, the geometrically accurate position of the actual Hinge axis for the pivoting movement more or less the same To leave sb.

Without the measures according to this invention the actual Hinge axis only somewhere within the width of the Falzrille.

The folding device as a separate creasing station eliminates this Disadvantage due to precise line-shaped clamping of the blank Over the entire blank length during grooving.

The folding device together with a turning device (= Folding station) eliminates this disadvantage by precise line-shaped Clamping of the blank during simultaneous inward pivoting movement Of the side flaps.

All of the embodiments of the invention are the linear ones Clamping of the blank by the bending device. In this case, the clamping lines can also be realized, Characterized in that the folding edge and the corresponding support zone are arranged in the manner of a Scissors or punch on the blank.

In practical observations it could be seen that in cardboard blanks Inserted folding seams despite geometrically identical Carton blanks never correspond exactly to the inside dimensions led. The material cross section in the Area of ​​the segmented groove plays a significant role, since there in particular The stiffening effect of the wave comes into play. Of the Course of the wave with different folding grooves is always pure So that conditions which are uniform with this invention Have been created for folding grooves.

Thus it could be found that with corrugated board dependent on the Course of the wave in the fold groove an unintentional and Unpredictable displacement of the actual folding zone Was carried out. The fold zone always existed where the folded Carton blanks had the least bending stiffness.

Conventional creasing devices (eg running against each other Rollers) do not prevent the blank after the grooving Immediately relaxed again as soon as he no longer compelled the Roll. The point - shaped clamping between the Rolls do not provide for local deformation of the blank High pressure, but can not be maintained downwards And is not effective.

The invention differs substantially from this in that The line-shaped clamping of the blank statically to the blank Over the entire blank length. The Grooving is thus effected by a static displacement over the Total cutting length. Displacement can therefore be carried out exclusively Laterally, and not, as in the case of mutually moving ones Rollers, also in or against the conveying direction.

This results in particular with low cardboard strengths Problem.

This displacement of the actual folding zone within each Falzrille led to different cuts in pre-cut blanks Faltergebnisse with different slot widths in the Area of ​​overlapping side flaps. There are effects Inaccuracies in the geometrical position of the actual folding zone Within the crease grooves is particularly serious. in the The worst case can be the inaccuracies at this point Of the other digits.

It has been tried in this context, in the rear area Of the conveying path, that is, where the side flaps between 90 and 180 degrees, so-called folding knives.

This is just above the middle of the Folded sheet metal strips, whose Outwardly facing edges in the folding grooves. The Upwards are clamped in a stationary manner. The Downstream of the conveying path. The free length can be up to two meters and more. It is, therefore, understandable if an already too narrow prefolded Carton blanks is readily capable of forming the cantilevered portions Swords. On the other hand, errors can occur Wide pre-folded cardboard blanks are also no longer repaired Because the folding knives then no longer touch The folding zones. A correction of any more flawed Prefolding, too far or too narrow, is thus in this way not possible. To the extent intended by means of these folding knives The effect of accurate cardboard management was therefore narrow . On the other hand, the free ends of the folding knives can be removed Also not stationary, since in the region of the Free ends the side flaps closed on the middle part In order to be able to glue them together there.

The invention completely deviates from this known teaching from. The invention has recognized that a considerably increased accuracy By the precise positioning of the seam groove By precise initiation of the folding process at millimeter precision Defined folding zone can be achieved.

This is only possible on the front part of the conveying path.

In the front part of the conveying path, the side flaps lie first Still spread.

If it is a creasing station, the folding grooves in the Spread state into the blank.

This is the folding station The side flaps during the clamping of the blank From the spread position at least 60 degrees inward Pivoted.

The geometrically exact processing of the blank (creasing or Prefolding) in the front region of the conveying path is essential to the invention And does not require any later correction.

In this case, the provided folding device can already be provided Beginning of the folding process the exact positioning of the later Fold zone in the fold groove, independently of the respective one Cross section of the carton blank in the area of ​​the Falzrille. The folding device engages directly in FIG Of the fold groove. The layer between the outer layers of the corrugated box Lying wave is pressed so as to be flattened so that one of a For all folding grooves of uniform cross-section construction Can The folding edges of the folding device extend Along the conveying path at least so far that the folding zones Can no longer be relocated on the remaining transport route can.

For this reason, in the front area of ​​the conveying path, one Exact guidance of the side flaps along the provided folding edges, And no change in the rear region of the conveying path more.

In this case, it is sufficient for the bending device to be located only in the front region Of the conveying path.

Thus, in the case of a creasing station, that longitudinal region of the Transport path on which the side flaps are spread lie.

This is at the folding station The longitudinal range on which the side flaps From the spread position to at least one approximately Right angle.

The particular advantage is the following combination: On the one hand, the side flaps are on the front part of the Transport route still widely spread. On the other hand, Front area of ​​the conveying path, the bending device Also to be clamped at the end, ie, conveyor way down, so That the exact position of the folding edge in the fold groove for all Folded on a folding machine is identical.

An unintentional progression of the folding groove (= hinge axis) On carton blends that are too narrow or too wide Thus prevented.

It is important that the two running parallel Folding edges, which attack in the folding grooves, remain the same Distance from each other and span a plane parallel To the plane of movement of the conveyed center part. This results in an exactly right-angled folding of the side parts Enforced.

As a result, the smallest possible area of ​​the seam groove to the Hinge between the middle section and the side flap. This is, however, the case The position of the actual folding zone geometrically exactly fixed, Which in the case of slotted cardboard blanks additionally the accuracy Of the resulting slot width of the last slot elevated.

Furthermore, it is essential that, in the contact region between the folding edge, Support zone and folding carton blank, no relative movement In the conveying direction. This avoids wear and tear Moreover, an increase in the contact force between Folding device and cardboard blank. Hot running is also Not to fear.

The bending device according to the invention is controlled by a synchronous drive With such a conveying speed that: The processing on the carton with the conveying speed of the Cardboard boxes. Here, it is advantageous to avoid any slippage So that, in fact, from static conditions on the Cut can be issued.

Preferably, the folding edges are formed by continuous endless chains , The chain members of which are provided with a lamellar or steical Protrude into the rebate grooves.

Such endless chains are synchronized with the conveying speed driven.

In this case, it is advantageous for the lug-like extensions to be provided with Their outer sides facing the side flaps with respect to the side flaps Plane of the central part has an angle of not more than 90 degrees, Preferably no more than 70 degrees. There are also embodiments Conceivable, in which the folding edges up to the point Downward until the side parts approximately Together. This is available on the one hand Standing space between the side flap and the middle part, which By the inwardly pivoted side flap increasingly smaller Is used optimally and on the other hand a high proportion of the Applied to the folding box blank.

However, a creasing station with steady forts is used The folding edge and the corresponding support zone If possible, perpendicularly against the blank The greatest possible proportion of the pressure force into the desired Deformation of the blank in the region of the folding groove.

The features of claims 6 - 9 provide for further improvement Of production precision and, in particular, The side parts of the blanks only by such pivoting forces Inward between the front contact point And the rear contact point between the side part and the reversing belt Are not only equally large and rectified, but essentially With respect to the folding grooves on the side parts In such a way that the side edge of the Side part parallel to the seam groove, The pivoting movement is imprinted.

In this way, the advantage is obtained in particular, Swiveled side parts even then precisely around the pivot axis Can be pivoted in the seam groove when the blank is inserted into the seam Area of ​​the folding device already completely or partly leave Has. Thus, independent of the engagement ratio Between the bending device and the blank is always the same Axis of rotation in the seam groove, whereby the Both side flaps are always accurate Remain parallel. The folding container therefore becomes exactly parallelepiped Folded. The invention is described below with reference to exemplary embodiments In more detail.

Show it<dl tsize="14" compact="compact"><dt>FIG</dt><dd>A folding machine in three-dimensional view,</dd><dt>FIG</dt><dd>Front region of a folding machine according to FIG. 1 in FIG View from above,</dd><dt>FIG</dt><dd>In the longitudinal direction of a folding machine according to FIG 1,</dd><dt>FIG</dt><dd>2 shows a side view of a folding machine according to FIG. 1,</dd><dt>FIG</dt><dd>2 shows a side view of a folding machine according to FIG. 1, </dd><dt>FIG</dt><dd>Detailed view of a bending device with endlessly circulating Link chain (upright plane),</dd><dt>FIG</dt><dd>Detailed view of a bending device with endlessly circulating Link chain (horizontally lying plane),</dd><dt>FIG</dt><dd>Schematic view of a folding machine with creasing station.</dd><dt>FIG</dt><dd>Special design of the folding device For creasing station according to FIG</dd><dt>10 a - c</dt><dd>Interaction between reversing straps And sides of the blanks A) most frequent case (B) possible borderline C) Theoretically conceivable case</dd></dl>

Unless otherwise stated in the following, the following applies Description always for all figures.

The figures show a folding machine 1 for the production of a folding machine 1 Folding container.

In principle, such a folding machine consists of a central folding machine Conveyor belt 2, which is endless with conveying speed 3 Circulating. The outwardly facing belt surface of the conveyor belt 2 Provides a support surface for a folding carton blank 5. This folded box blank lies on the central conveyor belt 2 And is driven by drivers connected firmly to the conveyor belt 4 in the conveying direction 3. Such a folding carton blank Has a middle part 6, with which it rests on the Central conveyor belt 2. On both sides of the middle part Laterally arranged folding grooves 7 are provided. Folding grooves Are provided here with longitudinally extending and interrupted Double lines. The folding grooves 7 lie Parallel to the conveying direction 3 and provide hinge-like connections Between the middle part 6 and the respective one which is attached thereto Side portion 8. Along these hinge-like folding grooves The side parts 8 can be moved with respect to the longitudinal center 10 of the blank 5 can be pivoted inwards. For this purpose, so-called Reversing straps 9, which are essentially parallel to the central conveyor belt 2. These are endless endless flat belts, In the course of the entire transport route from a level below Of the central conveyor belt 2 to a plane above the central conveyor belt Conveyor belt 2, slightly in the direction To the central conveyor belt 2 and at the same time with Of its upwardly facing belt outer side at the end of the Ie, toward the central conveyor belt 2. A side part 8 rests against these belt outer sides. The Side part 8 must follow the entanglement of the reversing belt and Is thereby raised from the initially spread position, along Of the folding grooves progressively towards the longitudinal center of the blank inwards And finally from above with the opposite Side part 8 and connected thereto.

In this type of folding machine, First unwound container blank is an annular closed Folding container with at least two mutually parallel Folding grooves. It is now conceivable that the folding grooves 7 Have a certain transverse extension, according to FIG. FIG. 9 is also ready for folding B.

This transverse stretching can, for example, be in the range of 1 cm lie. However, the actual folding zone can be changed at any one Position within the seam groove 7.

The actual position of the folding zone thus results purely by chance, Unless additional measures are taken to initiate the Folding operation at a predetermined position (see FIG. 1) or if the folding grooves do not fit into the Cut and set a priori (cf. 8).

For this purpose, it is provided according to the invention that in the front region 11 of the entire conveying path Is. This bending device 12 is composed of a plate Section 5 and of a lower edge 13, which is situated below the Cutting edge 14 corresponding to the folding edge.

The fold edge 13 arranged above the blank is located In the longitudinal direction of the folding groove 7 in the form of a line on the blank 6. The line is within the specified width of the seam groove 7. In this weakened area of ​​the blank, Embodiment 1 therefore offered a limiting edge, At which the side part 8 pivots inwards in millimeters While being simultaneously moved back and forth from the central conveyor belt 2 Forward.

For this purpose, the blank 6 is cut from the linear shape Fold edge 7 with a predetermined force against the corresponding Support zone 14. The blank 5 thus becomes bilateral Of the middle part 6 from the folding device provided there in each case 12 at a predetermined position within the folding grooves 7 Shaped. The distance between the clamping zones is By the arrangement of the folding devices 12 on the machine frame Unchanged, so that for the whole batch of the Folded on this folding machine Internal dimensions are to be expected.

Furthermore, it is essential for both embodiments that in each case The bending device 12 is synchronous with the conveying speed 3. For this purpose, a drive 15 for the Folding device 12.

Here the drive 15 consists of the central machine motor 16. This engine motor usually drives all the units of a Such machine. For the reasons of the Comprehensibility not shown. It is, however, important that All drive trains are slip-free via mechanical connections In order to achieve a synchronous movement of all parts.

In the present case, the motor 16 drives, in addition to the (Not shown) Chain 17, the pinions 18, 19 respectively of the same diameter; from (18) for driving the folding edge 13, and of which The other (19) for driving the corresponding support zone 14. Via a continuous drive axle 20, Rotary movement of the drive 15 to the opposing bending device 12. Over an additional link chain 17 on this side is the movement of the corresponding Support zone 14 with the movement of the folding edge 13 as well Synchronously coupled.

This also applies analogously to the design according to art. FIG Separate creasing station.

For reasons of better clarity is in the representation According to FIG. 1 the front on the right side of the blank Running reversing belt is not shown. From the entanglement of the Shown on the left side, however, Recognize that the outer side of the turnbuckle is composed of initially horizontal Clockwise direction by 90 degrees to the vertical direction Is pivoted inwards.

Accordingly, the front region of the conveying path 11, which is decisive, lies For this invention, where the side portion 8 is made of a sheet of paper Initially substantially spread position (= 180 degrees) at least So far as the angle has been pivoted inwards Between the side part 8 and the middle part 6, the apex of which in the Falzrille 7 is at most 120 degrees.

It is not necessary for the bending devices 12, At the beginning of the pivoting operation on the blank. However, it is essential in each case that the pivoting angle, Calculated from the spread position of the blank, Is at least 60 degrees. However, With such a pivot angle, the folding zone can be moved inwards Of the segmented groove 7 has already been so precisely defined that An unintentional displacement of the millimeter-precision Fold zone (= hinge axis) can no longer take place.

However, since mechanical variables such as line width, clamping force, Carton strength, and in particular The blank in the area of ​​the folding groove can not be destroyed These influencing factors are, in a delimitation of the exact Angle range with. Anyway, could Under normal conditions an inward pivoting angle of 60 degrees Already ensure the desired accuracy of the internal dimensions.

Moreover, it should be expressly stated that the folding edge namely to attack linearly in the folding groove, that, however, In no way limit this invention to uninterrupted Line-shaped contact zones between the folding edge and the folding groove is meant. The essential point is that the line-shaped Course of the folding edge at least with such longitudinal dimensions That an unintentional displacement of the Provided.

In addition, FIG. 2 shows that the folding edge of a Continuously circulating chain. In doing so, Which forms the folding edge 13, from the opposite side Side pressing device 21 with a chain pressing device 21. This chain pressing device 21 has along the folding edge 13 Lying slides 22, which are arranged on assigned holders 23 sit. A plurality of such holders 23 with sliding pieces 22 Is arranged on a common carrier 24.

It becomes a pressure zone along the chain line In order to bring the folded edge 13 into the Press Falzrille 7 down. Each carrier 24 is connected by means of a Holder 26 transverse to the conveying direction 3 in the sense of a change in the distance To the respectively opposite carrier 24. Thus, the bending device 12 is moved to different positions Cut dimensions Is that the position of the folding edges 13 is parallel to one another And where possible at a common level. The Common plane is parallel to the plane of the blank 5.

In order to achieve the most accurate folding possible, It is proposed that folding edges be inserted exactly into the longitudinal centers 28 of the Fold grooves 7. There, the use of the proposed Measures the lowest resistance moment at the Pivoting movement of the side flaps.

As can also be seen in FIG. 2, the corresponding Which have a certain width 27, so that On both sides of the folded edges 13, an edge strip still remains. As a result, it is sufficient, in the case of a change in the distance of the Carrier 24 the position of the corresponding support zone 14, In particular of the seat belt, remain unchanged. For this Further development of the invention comes as a corresponding one The entire width 27 of the flat belt can be considered.

Furthermore, FIG. 3 shows that the folding edge of one of the belt edges Of a circulating folding belt 30 can be formed. It Is a flat belt. The axis 44 of the belt deflection roller 45 is oriented with respect to the normal plane to the plane of the Slit 5 slightly inclined. Preferably, these are A so-called toothed belt of the somewhat lateral Can absorb forces without shifting from its course. The belt track provided on such belts engages In a manner known per se, into corresponding annular-groove-shaped recesses Of the deflection rollers 45. In this way, a Certain contact pressure between the folding belt edge 30 and Of the segmented groove 7. Due to the slight inclination of the Belt axle 44 can run counter to the conveying direction Riementrum with the free belt edge 31 non - contact on the Cutting. The rest is the same Of the representation according to FIGS. 1 and 2 Is therefore referred to the previous Description.

Moreover, FIGS. 4 and 5 show a further development in which Between the end deflecting rollers 46, 47 of the support zone On its underside 48 guide devices 32 are provided, by means of which this belt of the belt is inserted Against the underside of the blank 5.

In the case of FIG. 4, the guide device consists of one Guide rail 33, which is supported on elastic mountings 34 Is. These elastic brackets consist of one Stationary fixture 35, as well as a longitudinally displaceable This receptacle moving rail counterpart 36. The counterpart Is elastic against the location-fixed receptacle with spring 37 And presses with a predetermined force against the Underside of the belt forming the support zone 14, while At the same time the folding edge 13 is held in the counter-direction. In this way, a predetermined one is formed along the folding groove 7 And the length of the front portion of the conveyor Constant pressing force.

Especially for higher speeds, however, are suitable Guide rollers 38 running along the underside of the support zone 14 and are arranged in the same manner Press elastically against this underside. Through this Additional friction is avoided, wear is reduced, And nevertheless a substantially constant pressure force In the region of the seam groove.

Furthermore, FIGS. 6 and 7 show that the folding edges 13 of FIG Cross-flaps of an endless chain circulating at the conveying speed 39 can be formed. This endless chain 39 lies in one Of the outer chain contour Chain guide rail 40. This chain guide rail 40 is a chain guide rail Standard component and sits on a common carrier 49, which in turn is attached to the machine frame.

One chain wheel is a respective end side of the chain guide rails 50, one of which is connected via the motor 16 in FIG Rotation. The chain guide rail extends Along the front portion of the conveying path. The recess Of the chain guide rail is closely the outer contour of the Chain links. Consequently, the cross-pieces 41 follow exactly The linear shape of the recesses along the front Area of ​​the conveyor. In this way, a substantially Constant contact pressure between folding edge 13 and Fold groove 7, or corresponding support zone 14.

In addition, guide device / chain guide rail With hydraulic cylinders. This provides The advantage of a caliber thickness or carton quality Independent contact pressure between the folding edge and the corresponding one Support zone.

In the case of FIG. 6, the axles 51 of the chain wheels are essentially Parallel to the plane 42 of the blank 5. However, the axles 51 can be used to avoid early collision With the inwardly pivoted side parts 8 slightly to the side Longitudinal center 10 of the blank 5. In any case But the axes are also perpendicular to the conveying direction 3 To prevent relative movements between the transverse lugs 41 and The blank 5. The transverse tabs 41 are provided Such an arrangement of the axle 51 radially outwards, On the axle 51.

The embodiment according to FIG. 7 differs from this in that, In this case, the axles 51 of the end-side chain wheels 50 essentially Perpendicular to the plane 42 of the blank 5; Cross-pieces 41 are now so far angled that these are arranged in the Substantially parallel to the axes 51, that is, between exact parallel and outwardly is toward positive (Fig. 7), aligned And facing the blank 5.

FIG. 8 shows that the folding device also comprises As a separate station 55 for the production of folding grooves Is.

In such a machine, in the direction of travel 3 A feeding station 52, optionally a dyeing station 53, Slot station 54. It can now be a Creasing station 55 can be provided, with which the arriving Flat blanks in the conveying direction. For this purpose Bending devices as described above. It But in this case the inward pivoting of the Side parts, so that the pre-grooved flat blanks can be cut to form a Stack 56 are conveyed.

In particular, such embodiments are suitable, In which the support zone 14 forms a longitudinal groove 58 which extends from One or two raised longitudinal regions 59. The Folding edge with a longitudinal web 60 forms the counterpart to the Longitudinal groove, which essentially lies opposite the longitudinal groove 58 (See Figure 9). The longitudinal web 60 can fit exactly into the longitudinal groove 58, so that the blank is linear And at the same time at least temporarily static grooved becomes.

It can be seen that the distance between folding edge 13 and Corresponding support zone 14 is less than the thickness D Of the material cut. In this area, the Cut flattened with constriction of the sides.

The constriction is continuous, so that ultimately the Width B of the folding groove can not be precisely defined. in the The width B, however, comprises the constriction Area.

A downstream folding station 57, as described above, can also be used Can be provided.

In addition, FIGS. 10a to c show a development Of the invention, which is suitable for holding the side parts 8 of the Blanks 6 in such a way that practically a cuboid shape Folding carton.

Shown is firstly the section of a conveyor belt 2, which Moves in the direction of travel 3. Located on the conveyor belt 2 The middle part 6 of the blank is located on an anterior edge From the driver 4 in the conveying direction.

The folding grooves 7 are already inserted with the bending device Has been reported. However, the bending device can also be used in The folding grooves 7. Due to the constantly moving forward Central conveyor belt 2 therefore sweep over the existing one Folding grooves 7 along the conveying path a so-called travel range, Which forms a geometrical driving line. Within this The middle part 6 is moved, the side parts 8 must now be folded. The reversing straps are used for this purpose 9, of which in each case that longitudinal section is shown, Which at the moment interacts with the side parts 8. The Reversing straps 9 rise with respect to the line-shaped driving ranges Of the folding grooves 7 from below to above and run from According to; as, thanwie, FIG.

In principle, the reversing straps are therefore not exactly parallel to each other The side parts 8. The belt outer sides 62, however, run in In each case convergent to the prominently drawn front edges Of the side parts 8 and lie there. Depends on the Therefore, front contact points are created for each belt geometry 61 which, according to FIG. 10a, are arranged on the side facing the seam groove 7 Belt edge 64, as shown in FIG Or according to FIG. 10c in the region of the Which is turned away from the fold groove 7.

The difference of FIGS. 10 a - c therefore essentially exists Therein, the different possible contact points 61 Between the belt outer sides 62 and the - markedly highlighted here -, front part of the side parts. In consequence The fact that the axes of the belt deflection rollers (see FIG 1) are intersected with each other at a certain angle, Therefore results for the rear regions of the side parts 8 Predetermined geometric position relative to the outer sides of the Reversing straps 9. In any case, it is assumed that in the rear Of the side parts 8 between the belt outer side 62 and the outside of the side portion 8 first of all an immediate Contact is excluded.

One of the belt edges, here 64, is closer to the outer side Of the side flap 8 as the other of the belt edges (here 63).

In order now to make a geometrically as unique as possible for the side flap 8 Attachment to the reversing belt 9 is attached to one of the To provide an elevation 65 to both belt edges 63, 64.

In a preferred embodiment, this increase is to be continued Spaced apart belt edge 63, to provide the desired distance Hinge axis 7 forms a favorable lever spacing For pivoting the side flap 8.

The peculiarity consists in the fact that the elevation increases So far over the outside of the belt, that the side part 8 with its rear area also guided there becomes. It thus also arises in addition to the front contact point 61 Here also a rear contact point 66, which preferably is provided with a Larger lever arm with respect to the folding groove 7 on the side part 8 Attacks In addition to the requirement that the side part 8 is attached to the Rear contact point 66 is also to be applied To ensure that the side edge 67, which is to be pivoted inwards, Practically exactly parallel to the seam groove 7, while The blank is driven in the direction of conveyance and during While the side part 8 is pivoted inwards.

For this, FIGS. 10 a-c each show a geometric line A, which represents the pivot axis in the fold groove 7, And a line C which is connected to the side edge to be pivoted inwards 87. Lines A and C are exact Shown in parallel. As a result of the elevation of the elevation 65 The side part 8 is supported in such a way that the line C Exactly parallel to the line A. The continuously inwardly pivoting Reversing belt 9 ensures virtually exact compliance This parallelism as long as and during the side part 8 from the spread position until completion of the blank (See FIG. 1).

It should also be taken into account that the front contact point 61 and the rear contact point 66 are, in principle, only point-shaped Can abut the side part, in order to cross the attack point Between reversing belt and side part during the Inward pivoting movement.

If the deflection of the side part 8 is also to be prevented, It is also proposed that the front contact point 61 and The rear contact point 66 by means of a common envelope 68, which are likewise linear in shape on the side part 8 Should be. This can be realized, for example, Along the envelope 68 from the rear contact point 66 Extends continuously to the front contact point 61 Decreasing elevations 65 can be arranged, their contact points With the side parts 8 on the envelope 68, respectively Should be. Here, too, only point-shaped contact is intended Can be preferred, so that, in the ideal case, the envelope 68 can only be used Is a line.

Particularly preferably, the envelope 68 is intended to be arranged diagonally from Of the rear contact point 66 via the reversing belt 9 to the front Contact point 61. However, this is not a requirement. It essentially depends on the amount of the increase 65 in such a way that the side edge 67 of the side part 8 Is exactly parallel to the segmented groove 7 when the side part 8 is raised Of the elevation 66.

Furthermore, there is also no exact match of the length Of the side part 8 with the length of the envelopes 68. Much more The envelope 68 can also be longer than the side portion 8. In this way, such a turning belt 9 is used for processing Different carton dimensions.

REFERENCE

<dl tsize="3" compact="compact"><dt>1</dt><dd>Folding machine</dd><dt>2</dt><dd>central conveyor belt</dd><dt>3</dt><dd>conveying speed</dd><dt>4</dt><dd>driver</dd><dt>5</dt><dd>Folding carton blank</dd><dt>6</dt><dd>middle section</dd><dt>7</dt><dd>Falzrille</dd><dt>8th</dt><dd>side section</dd><dt>9</dt><dd>Reversing belt</dd><dt>10</dt><dd>longitudinal center</dd><dt>11</dt><dd>front area</dd><dt>12</dt><dd>Folding device</dd><dt>13</dt><dd>folding edge</dd><dt>14</dt><dd>Support zone</dd><dt>15</dt><dd>drive</dd><dt>16</dt><dd>motor</dd><dt>17</dt><dd>Chain</dd><dt>18</dt><dd>pinion</dd><dt>19</dt><dd>pinion</dd><dt>20</dt><dd>drive axle</dd><dt>21</dt><dd>chain pressing device</dd><dt>22</dt><dd>slider</dd><dt>*** "</dt><dd>holder</dd><dt>24</dt><dd>carrier</dd><dt>25</dt><dd>Machine frame</dd><dt>26</dt><dd>holder</dd><dt>27</dt><dd>Width of the support zone</dd><dt>28</dt><dd>Longitudinal center of the seam</dd><dt>29</dt><dd>circulating folding belt</dd><dt>30</dt><dd>Belt edge (folding) </dd><dt>31</dt><dd>Belt edge (free)</dd><dt>32</dt><dd>Guiding device for support zone</dd><dt>33</dt><dd>guide rail</dd><dt>34</dt><dd>elastic support</dd><dt>35</dt><dd>location-resistant recording</dd><dt>36</dt><dd>Rail counterpart, roller counterpart</dd><dt>37</dt><dd>feather</dd><dt>38</dt><dd>Leadership role</dd><dt>39</dt><dd>circulating endless chain</dd><dt>40</dt><dd>chain guide rail</dd><dt>41</dt><dd>cross tabs</dd><dt>42</dt><dd>Plane of the blank</dd><dt>43</dt><dd>entire transport route</dd><dt>44</dt><dd>axis</dd><dt>45</dt><dd>Belt pulley</dd><dt>46</dt><dd>end deflection roller</dd><dt>47</dt><dd>end deflection roller</dd><dt>48</dt><dd>bottom</dd><dt>49</dt><dd>carrier</dd><dt>50</dt><dd>Sprocket</dd><dt>51</dt><dd>Axis of the sprocket</dd><dt>52</dt><dd>Feeding station</dd><dt>53</dt><dd>Coloring station</dd><dt>54</dt><dd>slot station</dd><dt>55</dt><dd>creasing station</dd><dt>56</dt><dd>stack</dd><dt>57</dt><dd>Folding station</dd><dt>58</dt><dd>longitudinal groove</dd><dt>59</dt><dd>raised longitudinal area</dd><dt>60</dt><dd>Longitudinal beam</dd><dt>61</dt><dd>front contact point</dd><dt>62</dt><dd>Belt outside</dd><dt>63</dt><dd>Further spaced belt edge</dd><dt>64</dt><dd>Closer-spaced belt edge</dd><dt>65</dt><dd>increase </dd><dt>66</dt><dd>rear contact point</dd><dt>67</dt><dd>Side edge</dd><dt>68</dt><dd>Enveloping</dd><dt>A</dt><dd>Hinge axis of the folding groove</dd><dt>B</dt><dd>Folding groove width</dd><dt>C</dt><dd>Parallel to A</dd><dt>D</dt><dd>Thickness of the material blank</dd></dl>