Device for conveying a motion picture film

The invention relates to a device for transporting a motion picture film according to the preamble of claim 1.

DE 44 18 471 A1 discloses a motion picture recording camera for the exposure and intermittent transport of a one or two-sided perforated motion picture film. The unexposed motion picture film arranged in a film cassette connected to the camera housing of the motion picture film recording camera enters through an opening into the camera housing of the motion picture recording camera and leaves it through this opening as an exposed film. The feed of the motion picture film consists of one or more film transport sprockets which continuously move the motion picture film while a film switch intermittently moves the motion picture film past an image window where it is covered in the transport phase by a rotating circular aperture and is released for exposure during the exposure phase. To compensate for the continuous film movement and the intermittent film movement film loops are formed on both sides of the image window.

The rotating orifice consists of an orifice plate which is driven either by an orifice motor which is electrically coupled to the film transport or camera motor of the film drive so that the speeds of the diaphragm motor and the camera motor run synchronously, or a direct mechanical coupling is provided Which is coupled to the camera motor via a film transport gear.

The film switching mechanism includes a film guide and a dipping gripper mechanism with a transport gripper which is moved by a gripper transmission in such a way that its at least one transport gripper tip describes during the intermittent transport of the motion picture film a self-contained crank loop in which the transport gripper tip first dips into the film perforation, the film transport step , Exits the film perforation and returns to its initial position. At the reversal points of the crank loop of the transport gripper, the blocking gripper tip, which describes an oscillation movement, of a blocking gripper correlated with the movement of the transport gripper, engages into the film perforation, assumes a possible correction of the orientation of the motion picture film in the film plane and secures the image stability of the motion picture film during the exposure of a film image. After the exposure of a film image of the motion picture film, the blocking gripper tip is withdrawn again so that the motion picture film is released by the transport gripper for a further film transporting step.

In order to make possible a greater exposure margin during the exposure of a motion picture film or a higher brightness yield during the reproduction of a motion picture film, the gripper transmission comprises two transmission shafts, which are moved in the same direction of rotation, of which one transmission shaft has an angular speed n times the other transmission shaft, and the light sector Of the diaphragm disc can be changed either proportionally to the angular speed or the diameter of the diaphragm disc can be selected to be proportional to the angular speed and the center point of the diaphragm is displaced to the image window with decreasing diameter of the diaphragm disc.

It is known to move the motion picture film for exposure or projection of a film image either by three or four perforation holes of the one or two-sided film perforation in a film transporting step and thus different aspect ratios of the image formats and in the case of film transport steps by three perforation holes by 25 percent Greater utilization of the film material used.

DE 690 24 048 T2 (corresponds to US Pat. No. 4,900,293 A) discloses a toothed roller assembly for adapting a film projector to film transport steps by three or four perforation holes per film image, in which the toothed roller connected to a drive shaft consists either of a cylindrical inner sleeve, Film perforation-engaging teeth or a cylindrical outer sleeve which can be plugged onto the cylindrical inner sleeve and which also engages into the film perforation. At the same rotational speed of the drive shaft and the same tooth pitch but with different diameters of the inner sleeve and the outer sleeve, four / three times as much motion picture film is transported with the outer sleeve as with the inner sleeve being removed with the outer sleeve removed so that the outer sleeve for film transport steps is formed by four perforation holes per film image and The inner sleeve is determined and suitable for film transport steps by three perforation holes per film image.

The known toothed roller assembly can be used with a film projector which is equipped exclusively with toothed rollers for continuous and intermittent film transport with optionally three or four perforation holes per film. However, for the following reasons, it is not applicable, at least not without restrictions, for the film transport by optionally three or four perforation holes per film picture in a motion picture film recording camera as in the motion picture film recording camera with film-toothed rollers known from DE 44 18 471 A1 Gripping mechanism for intermittent film transport.

In a film transporting step by four perforation holes per film image, the transport gripper transports the motion picture film by four perforation holes each time the camera motor rotates, the unwinding toothed roller peeling the motion picture film out of the film cassette and the winding reel conveying the motion picture film back into the film cassette. If the toothed wheels each have 16 teeth, they rotate accordingly with a quarter of the drive shaft of the camera motor driving the gripping mechanism. On the other hand, during a film transport step, the transport gripper transports the moving image film three perforation holes per film image to one perforation hole for one revolution of the camera motor. In order to maintain constant film loops in order to compensate for the intermittent and continuous film transport, the gear ratio for driving the toothed rollers must therefore be changed in the case of a camera motor which drives both the gripping mechanism and the toothed rollers, so that they rotate only by three teeth with one revolution of the gripper drive shaft, Remove the corresponding film length from the film cassette and promote it into the film cassette.

An application of the toothed wheel assembly known from DE 690 24 048 T2 in a motion picture recording camera with a gripping mechanism would therefore necessitate the conversion of the winding-up toothed roller and the unwinding toothed roller, or alternatively to replace the film transport mechanism for driving the toothed rollers, And gears to the changed rotational speed of the camera motor. For this purpose, however, the entire inner camera of the motion picture recording camera or parts thereof, in particular the camera electronics, would have to be dismantled, which would entail a considerable effort and additional costs.

The object of the present invention is to adapt the initially mentioned device to a film transport by three or four perforation holes per film image without an exchange of the film transport gear or the winding and unwinding sprockets or changing the geometry of the winding and unwinding sprockets.

This object is achieved according to the invention by the features of claim 1.

The solution according to the invention allows a film transport in a motion picture recording camera with a gripping mechanism by three or four perforation holes per film image without the need for an exchange of the film transport gear or the winding and unwinding sprockets or a change in the geometry of the winding and unwinding sprockets.

The solution according to the invention is based on the realization that it is much simpler and more technically more elegant for the purpose of adapting a motion picture film recording camera with a gripping mechanism to an alternative film transport by three or four perforation holes per film transporting step for constructive reasons, only the gripping mechanism designed as a gripper block or the It is possible to change the rotational speed of the cam motor driving the gripping mechanism and the toothed wheels or the winding motor which drives the toothed rollers and is electrically or electronically connected to the cam motor. (DE). WIPO Home services World Intellectual Property Organization While the camera motor or winding motor rotates by four perforation holes per film image at a full rotational speed which corresponds to the rotational speed of the rotary rotary screen so that the winding and unwinding spindles are rotated by four perforation holes per revolution of the drive shaft of the camera motor, The camera motor or the winding motor in the case of a film transport by three perforation holes, the film image is only 3/4 the rotational speed of the rotating rotary screen, so that the winding and unwinding sprockets also move only three perforation holes per revolution of the drive shaft of the camera motor. Since, however, the transport gripper of the gripper shifter has to make a full revolution of its crank loop by three perforation holes per film transport step when the rotating circular diaphragm makes a full revolution, the gripper transmission has to perform a 4: 3 translation to ensure that the transport gripper again has a full crank loop When the rotating circular aperture makes a full revolution.

Accordingly, the device according to the invention for transporting a motion picture film, which has at least one uniformly divided series of perforations, into which an unwinding toothed roller continuously unwinding the motion picture film from a film storage bobbin and a winding toothed roller continuously winding the motion picture film onto a film take-up bobbin and a gripping mechanism intermittently conveying the motion picture film. For transporting the motion picture film by three or four perforation holes per film transporting step, the winding-up toothed roller and the unwinding toothed roller move the motion picture film with three or four perforation holes per film transport step while different gripping mechanisms are provided for transporting the motion picture film by three or four perforation holes per film transport step.

The geometry and / or kinematics of the gripping mechanism are reduced by three, depending on the film transport, by three or four perforation holes per film transport step, so that the winding and unwinding toothed roller is driven at different angular speeds, ie at different rotational speed of the winding motor Or four perforation holes per film transport step.

Preferably, different gripping mechanisms are provided for the film transport by three or four perforation holes per film transport step as a so-called "gripper block" and, for example, are exchanged via a lateral camera in the camera housing in the event of a change of the film transport step without further interventions in the camera mechanism.

Since there are different drive forms and drive combinations for driving the gripping mechanism, the winding and unwinding toothed roller, as well as the circular orifice, the solution according to the invention also permits various embodiments.

In a first embodiment in which a camera motor drives both the gripping mechanism and the winding and unwinding toothed roller, the rotational speed of the camera motor for the transport of the motion picture film is changed by three or four perforation holes per film transport step and a film transport by three or four perforation holes per film transport step In its kinematics.

In a second embodiment, in which the camera motor drives the gripping mechanism while a winding motor drives the winding and unwinding sprocket with which it is usually arranged in the film cassette, only the rotational speed of the winding motor is transferred to the film transport by three or four perforation holes per film transporting step While the speed of the camera motor remains unchanged and the gripper mechanism adapted to the film transport by three or four perforation holes per film transport step is used as a gripper block in the camera mechanism.

Depending on the embodiment variant, either the rotational speed of the winding motor driving the gripping mechanism as well as the winding and unwinding toothed roller or the rotational speed of the winding motor driving the winding and unwinding toothed roller or the winding motor driving the winding toothed roller and the unwinding toothed roller are switched such that the winding toothed roller and the unwinding toothed roller Move the motion picture film with three or four perforation holes per film transport step.

The solution according to the invention is particularly suitable for a gripping mechanism with a gripper transmission and at least one transport gripper with transport gripper tips, which engage in the perforation holes of the moving image film and carry out an elongated, closed web curve in which they enter the perforation holes Or four perforation holes, and then ripping out of the perforation holes and returning them to their initial position, and whose translation corresponds to a film transport by three or four perforation holes per film image.

In this embodiment of the film switching mechanism as a gripper transmission, the change of the transmission of the gripper transmission for a film transport by three or four perforation holes per film image can be carried out by a change-over of the gripper transmission.

The connection of the first or second film switching mechanism preferably takes place via a coupling with the film transport motor or with a film transport gear driven by the film transport motor.

The connection of the respective film switching mechanism to the film transport motor or the film transport mechanism by way of a coupling enables an easy exchange for the alternative film transport by three or four perforation holes per film image without the need for major interventions in the film switching mechanism or the mechanism of the motion picture film recording camera. In particular, the exchange can be carried out without disassembling the control electronics of the motion picture film recording camera, and an existing clutch can be used for folding the gripping mechanism during the threading of a motion picture film into the motion picture film recording camera.

In addition, but not necessarily, the gripping mechanism may have a locking gripper coupled to the movement sequence of the at least one transport gripper, which during the image state of the film images immerses into a perforation hole of the motion picture film.

In principle, the solution according to the invention is suitable both for a motion picture recording camera and for a projector, the advantages of the solution according to the invention being particularly prominent when a gripping mechanism is connected to the film transport gear for driving the winding and unwinding toothed roller and a co-rotation with a rotating circular aperture In the case of adaptation to the film transport by three or four perforation holes per film image which is driven either by a diaphragm motor which is electrically coupled to the film transport motor or which is mechanically connected to the film switching mechanism via a gear and is also driven by the film transport motor.

A preferred embodiment of the invention relates to a motion picture recording camera with a camera housing in which a rotating, circular-shaped diaphragm disc is arranged in the recording beam path and covers the picture window during a film transporting step of the film switching mechanism and releases the recording beam path for exposing a film image during the image state of the motion picture film, The gripper transmission of the film switching mechanism comprising a drive shaft which can be connected to the film transport motor or the film transport gear and has a first gripper gear wheel whose diameter determines the film transport by three or four perforation holes per film image And the other end of which comprises a transport gripper joint which is connected to a second gripper gearwheel which determines the gripper stroke of the transport gripper, and a crankshaft is arranged in the middle portion of the gripper gear and is connected to a third gripper gearwheel which determines the movement of the transport gripper perpendicularly to the plane of the motion picturefilm Gripper toothed wheels.

For adjusting the gripper transmission to the film transport by three or four perforation holes per film image, either the first toothed wheel can be exchanged, and in a first embodiment it can have a diameter corresponding to the film transport by three perforation holes per film image and in a second embodiment with a film transfer by four perforation holes per film image Or the first gearwheel is divided in the axial direction and has a first partial gearwheel with a first diameter corresponding to the film transport by three perforation holes per film image and a second partial gearwheel with a second diameter corresponding to the film transport by four perforation holes per film image Tooth divisions of both partial gear wheels.

As an alternative to a gripping mechanism, however, the solution according to the invention is also suitable for a film switching mechanism which contains a film transport toothed roller which is provided according to the invention with a diameter adapted to the film transport by three or four perforation holes per film. In contrast to the prior art, it is therefore not necessary to convert the winding and unwinding toothed roller for film transport by three or four perforation holes per film, but merely to adjust the speed of the film transport motor and to adjust the respectively required film transporting sprocket in The film switch.

Instead of using the respectively required film transporting sprocket in the film switching mechanism, a film switching mechanism with a film transporting sprocket for transporting the motion picture film by three or four perforation holes per film image can alternatively be provided, wherein the film transporting sprocket of the one film switching mechanism is provided with a film transport by three And the other film switch comprises a film transporting toothed roller with a diameter which is adapted to the film transport by four perforation holes per film image.

The idea to which the invention is based is to be explained in more detail with reference to an embodiment shown in the drawing. Show it:<dl id="dl0001"><dt>Figs.</dt><dd>A side view of a motion picture film recording camera with a device for transporting a motion picture film with a winding and unwinding toothed roller and a gripping mechanism and FIG</dd><dt>Figs.</dt><dd>2 shows a schematic perspective view of the film transport device according to FIG.</dd><dt>Figures 3a and 3b-</dt><dd>A block diagram for explaining the film transport with three or four perforation holes per film transport step with a camera motor driving the gripping mechanism and the winding and unwinding toothed roller, and a diaphragm motor electronically coupled to the camera motor for driving the rotary orifice plate;</dd><dt>Figures 4a and 4b-</dt><dd>A block diagram for explaining the film transport with three or four perforation holes per film transport step with a winding motor driving the gripping mechanism and the rotating rotary shutter, and one or two winding motors or rollers driving the winding and unwinding toothed roller</dd><dt>Figures 5a and 5b-</dt><dd>A block diagram for explaining film transport with three or four perforation holes per film transport step with electronically coupled camera motor, winding motor (s) and diaphragm motor.</dd></dl>

1 shows a motion picture film recording camera with a camera housing 1, a viewfinder eyepiece 11, a camera lens 12, and a camera cassette 13, which is connected to the camera housing 1 and in which a film storage reel with an unexposed motion picture film 10 and a film winding spool have been exposed with the motion picture film recording camera Motion picture film. The partially open-ended camera housing 1 includes a take-up sprocket 15 and a take-off sprocket 16 continuously winding the motion picture film 10 from the film storage spool of the camera cassette 13 continuously onto the film take-up spool of the camera cassette 13.

A gripping mechanism 2, which is driven by a cam motor not shown in detail, moves the motion picture film 10 intermittently past an image window 90 of a film guide 9 where the motion picture film 10 is covered in the transport phase of the gripper switching mechanism by a sector-shaped diaphragm disc of a rotating circular diaphragm 7, Rotating circular aperture 7 for exposing a film image. The sector-shaped diaphragm of the rotating circular diaphragm 7 is driven by an diaphragm motor 6, which is electrically coupled to the camera motor of the gripping mechanism 2, so that the speeds of both motors run synchronously. Alternatively, a mechanical coupling can be provided, in which the rotating rotary orifice 7, together with the gripping mechanism 2, is connected to the camera motor via a film transport gear.

In order to compensate for the continuous transport movement of the motion picture film 10 and the intermittent transport movement caused by the winding mechanism 15, 16, film loops are formed on both sides of the image window 90.

The gripping mechanism 2 is used for transporting the motion picture film 10 and for this purpose has two transport grippers 21, 22 and, if necessary, two locking grippers 23, 24 assigned to the transport grippers 21, 22 for securing the image position, which enter the perforation holes of the film perforations of the motion picture film 10. Furthermore, the gripping mechanism 2 comprises a gripper transmission 3 with a drive shaft, which is connected to the film transport gear or the camera motor. The transport grippers 21, 22 and barrier grippers 23, 24 are configured as dipping grippers and have, on their ends facing the motion picture film 10, transport gripper tips or barrier gripping tips, which alternately dip into the perforation holes of the film perforations of the motion picture film 10.

The transport grippers 21, 22 carry out a horizontal and a vertical movement in a film transporting step, wherein the transport gripper tips pass through an elongated, self-contained curve, and at the one end of the curve enter the perforation holes of the film perforations which they reposition at the other end of the curve So that the distance between the two reversal points determines the stroke length of the transport grippers 21, 22 or their transport gripper tips and thus a film transporting step.

By means of the mechanical coupling of the transport grippers 21, 22 and the barrier grippers 23, 24, the latter are located outside the film plane of the motion picture film 10 during a film transporting step, in which the motion picture film 10 is moved further around a film image while the transport gripper tips are immersed in the film perforations, Motion picture film 10 between the upper and lower reversal points according to the predetermined stroke length.

Upon completion of a film transporting step, the transfer gripper tips leave the film perforations, the locking gripper tips immerse into a film perforation hole of the film perforations aligned with the barrier gripper tips and ensure a fixed image stability of the motion picture film 10 from which the part to be exposed is positioned in front of the image window 90, Motion picture film 10 is released by the rotating circular aperture 7 arranged in front of the image window 90.

The film guide 9 consists of two lateral film supports on which the edge of the motion picture film 10 slides along with the film perforations provided on both sides parallel to the side edges of the motion picture film 10.

The intermittent and continuous film transport, the arrangement of the winding-up and unwinding-up reel as well as the drive of the rotary rotary screen can be different depending on the embodiment of the motion picture film recording camera.

In addition to a mechanical coupling of the rotating circular diaphragm with the camera motor driving the gripping mechanism, the winding and unwinding toothed roller can also be mechanically coupled to the camera motor. Alternatively, an arrangement of the winding and unwinding spool in the film cassette and its drive is possible by means of a winding motor electronically coupled to the camera motor for the winding and unwinding sprocket or two winding motors, which are electronically coupled to the camera motor, for the take-up sprocket or the unwind spool. Furthermore, the above-mentioned separate drive of the rotating rotary diaphragm is possible by means of a diaphragm motor, which is also electronically coupled to the camera motor.

2 shows a camera motor 4 which, via a film transport gear 8, drives both the winding-up toothed roller 15 and the unwinding-toothed roller 16 as well as the gripping mechanism 2. In the embodiment shown in FIG. The film transport gear 8 includes a first film transport gear 81 connected to the motor shaft of the camera motor 4, which is connected to a second film transport gear 82 and a third film transport gear 83 which drives the gripper drive shaft 30 of the shuttle 3 via a film transport toothed belt 80.

The second film transport gear 82 is coupled to a fourth film transport gear 84 of smaller diameter, which is connected to a first film winding gear 86 via a second film transport toothed belt 85 which, via a second film winding gear 87 as well as a connection not shown in detail, The unwinding spool 16.

The gripping mechanism 2 is connected to the film guide 9, which has curved film runners for guiding the motion picture film and for its exposure to the image window 90. The gripping mechanism 2 comprises a gripper gear 3, the two transport grippers 21, 22 engaging in one of the two rows of perforations of the motion picture film, as well as two blocking grippers 23 immersed in one of the two rows of perforations of the motion picture film for the purpose of aligning and securing the image level during the film direction of the motion picture film , 24.

The transport grippers 21, 22 contain a transport gripper tab which has a transport gripper hinge at its one end and three transport gripper tips at its other end which describe an elongated, closed loop loop for film transport, in which they initially dip into three adjacent perforation holes of the film perforations Remove the film transport step from the film perforation and return to its original position. The transport gripper joint determines the movement of the transport gripper tips perpendicular to the plane of the motion picture film and a crank joint arranged between the transport gripper joint and the transport gripper tips the transport stroke of the transport gripper tips in the transport direction of the motion picture film.

The blocking grippers 23, 24 are connected to the gripper transmission 3 by means of a control element, which is not shown in detail, in such a way that they perform an oscillating movement perpendicular to the film plane and thereby interpose with their locking gripper tips in a respective perforation hole of the film perforations in interchange with the transport gripper tips.

The gripper transmission 3 has the gripper drive shaft 30 which is connected to the third film transport gear 83 of the film transport mechanism 8 and which carries a first gripper gear wheel 31 which is connected via a gripper toothed belt 34 to a second gripper gear wheel 32 which is coupled to the transport gripper joints and thus the movement of the transport grippers 21, 22 perpendicular to the plane of the motion picture film, as well as to a third gripper gear 33, which is coupled to the crank joint and accordingly determines the transport stroke of the transport gripper tips in the direction of travel of the motion picture film.

The gripper drive shaft 30 can be implemented in a split manner and has a clutch 14 which is designed, for example, in accordance with the clutch known from DE 42 05 411 A1. Due to the arrangement of the clutch 14 or by a gripper drive shaft 30 which can be connected in a different manner to the third film transport gear 83 of the film transport gear 8, the gripping mechanism 2 can be exchanged in a simple manner against a gripping mechanism 2 ', and thus with the camera motor 4 of the film transport gear 8 unchanged and the winding motor 2 being unchanged And unwind spools 15, 16 are adapted to a film transport by either three or four perforation holes per film or film transport step.

In addition to a complete exchange of the gripper mechanism 2 designed as a gripper block against a gripping mechanism 2 ', a partial exchange of the gripper transmission 3 against a gripper transmission 3' with the transport grippers 21, 22 and locking grippers 23, 24 is also possible while retaining the film guide 9.

If a film transporting toothed roller is used instead of the gripper gear 2 shown in FIG. 2, it can either be driven with a different ratio by means of a gearing corresponding to the gripper gearing 3, or a film transporting toothed roller of smaller diameter for a film transport by three perforation holes Per film form or a film transporting toothed roller of larger diameter for film transport by four perforation holes per film image.

FIGS. 3a, 3b, 4a, 4b and 5a, 5b show various embodiments of the solution according to the invention as block diagrams.

3a and 3b show a block circuit diagram of the mechanically coupled drive of the gripping mechanism 2 shown in perspective in FIG. 2 and of the winding and unwinding toothed roller 15, 16 by means of the camera motor 4 and the drive of the rotating rotary diaphragm 7 separated therefrom by means of one Electronically coupled to the camera motor 4.

3a, the cam motor 4 drives the gripping mechanism 2, which is adapted to the film transport by four perforation holes per film transport step, and the winding and unwinding toothed roller 15, 16 with the rotational speed n. In the case of the film transport system shown in FIG_K1 , so that the winding and unwinding 15, 16 the motion picture film by four perforation holes per film transport step in a revolution of the gripper feed mechanism to rotate. The speed n_B Of the diaphragm motor 6 corresponds to the rotational speed n_K1 Of the camera motor while taking account of the over- or under-loading of the film transport gear 8 connected to the camera motor 4 according to FIG.

In a film transport shown schematically in FIG. 3b by three perforation holes per film transporting step, the camera motor 4 drives the gripping mechanism 2 'adapted to the film transport by three perforation holes per film transport step and the winding and unwinding toothed roller 15, 16 at a speed n_K2 , The 3/4 of the speed n_K1 For film transport by three perforation holes per film transport step. As a result, the winding and unwinding sprocket 15, 16 are rotated further by only three perforation holes of the motion picture film per revolution while the gripping mechanism 2 'performs a full revolution when the rotating revolution diaphragm 7 also completes a full revolution. The gripping mechanism 2 'is translated at 4: 3 to the gripping mechanism 2 and accordingly performs a full revolution with a full revolution of the rotary orifice 7 driven by the diaphragm motor 6, which is electronically coupled to the camera motor 4.

4a and 4b show, in a block diagram, a variant in which the camera motor 4 drives both the gripping mechanism 2 and 2 'as well as the rotating circulating screen 7, while a winding motor 5, which drives the winding and unwinding toothed roller 15, 16, respectively, A winding motor driving the take-up sprocket 15 and the unwind spool 16 is electronically coupled to the camera motor 4. *** "

In the embodiment according to FIG. 4a, during a film transport by four perforation holes per film transport step, the camera motor 4 is rotated at the speed n_K In the case of the use of a gripping mechanism 2 adapted for film transport with four perforation holes per film transporting step, while the winding motor 5 is operated at the rotational speed n_W1 The take-up and unwind spool 15, 16, which transport the motion picture film further by four perforation holes at each film transporting step.

In a film transport shown schematically in FIG. 4b by three perforation holes per film transport step, the camera motor 4 is driven at the same speed n_K For driving the gripper gear 2 ', which is adapted to the film transport by three perforation holes per film transport step, and the rotating circular diaphragm 7. On the other hand, the winding motor 5 rotates with a rotational speed n_W2, The 3/4 of the speed n_W1 So that the winding and unwinding toothed rollers 15, 16 are further rotated by three perforation holes per film transporting step, while the gripping mechanism 2 'and the rotating rotary orifice 7 perform a full revolution.

FIGS. 5a and 5b show a block diagram of an embodiment with a respective drive for the gripping mechanism 2 or 2 ', the winding and unwinding toothed roller 15, 16 and the rotating circulating screen 7 by means of a camera motor 4, a winding motor 5 and a diaphragm motor 6 , Which are electronically coupled to each other.

In a film transport step, shown schematically in FIG. 5 a, of four perforation holes, the camera motor is rotated at the rotational speed n_K Operated and drives a gripping mechanism 2 adapted to the film transporting step of four perforation holes. The winding motor 5 drives the winding and unwinding toothed roller 15, 16 at a rotational speed n_W1 So that they move the motion picture film by four perforation holes at each film transporting step. The diaphragm motor 6 is operated at a speed n_B , In which the rotary rotary shutter 7 makes a full revolution when the gripping mechanism 2 has also passed through a full crank loop, and the winding and unwinding sprocket 15, 16 have moved the motion picture film by four perforation holes.

In a film transport step, shown schematically in FIG. 5b, of three perforation holes, the camera motor 4 is also operated at the rotational speed n_K Operates and drives a gripping mechanism 2 'which is adapted to the film transport by three perforation holes per film transporting step, so that it passes through a full crank loop when the rotational speed of the diaphragm motor 6,_B Driven rotary orifice 7 performs one full revolution. On the other hand, the winding motor 5 is operated at the rotational speed n_W2 , Which is 3/4 of the speed n_W1 , So that the take-up reel 15, 16 moves the motion picture film 10 by three perforation holes per film transporting step.

Reference list

<dl id="dl0002" compact="compact"><dt>1</dt><dd>Cameroon houses</dd><dt>2, 2 '</dt><dd>Gripping mechanism</dd><dt>3, 3 '</dt><dd>Gripper gearboxes</dd><dt>4</dt><dd>camera motor</dd><dt>5</dt><dd>Winding motor</dd><dt>6</dt><dd>Aperture motor</dd><dt>7</dt><dd>Circular screen</dd><dt>8th</dt><dd>film transfer gear</dd><dt>9</dt><dd>Movie guide</dd><dt>10</dt><dd>motion picture film</dd><dt>11</dt><dd>Viewfinder eyepiece</dd><dt>12</dt><dd>Camera lens</dd><dt>13</dt><dd>Camera case</dd><dt>14</dt><dd>coupling</dd><dt>15</dt><dd>winding reel</dd><dt>16</dt><dd>Unwinding toothed roller</dd><dt>17</dt><dd>Aperture motor</dd><dt>21, 22</dt><dd>Transport grippers</dd><dt>23, 24</dt><dd>locking grippers</dd><dt>30</dt><dd>drive shaft</dd><dt>31, 31 '</dt><dd>First gripper gear</dd><dt>32</dt><dd>Second gripper gear</dd><dt>33</dt><dd>Third gripper gear</dd><dt>34, 34 '</dt><dd>Gripper tooth belt</dd><dt>80</dt><dd>First transport toothed belt</dd><dt>81</dt><dd>First transport gear</dd><dt>82</dt><dd>Second transport gear</dd><dt>83</dt><dd>Third transport gear</dd><dt>84</dt><dd>Fourth gearwheel</dd><dt>85</dt><dd>Second transport toothed belt</dd><dt>86</dt><dd>Fifth transport gear</dd><dt>87</dt><dd>Sixth gear wheel</dd><dt>90</dt><dd>Picture window</dd></dl>