DE630986C - Method and device for automatic threading of a recording medium - Google Patents

Description

The invention relates to the automatic threading of a recording medium, ζ. Β. Films, in a cinema machine with a sound device and one between the picture window and this lying synchronous device driven by the film. With such devices makes the formation of the so-called lower film loop, which lies behind the intermittently switching organ, during automatic threading particular difficulties; because either the recording medium is not stiff enough, thanks to its elasticity when the guide means are closed when threading the To start the synchronization device, or the recording medium is too stiff to with open guide means to form a loop.

According to the invention, this difficulty is eliminated in that to form the sub-

ao ren film loop the film is initially guided from the picture window to the sound track without loops with the formation of a loop the Nachwickelbzw. Aufwickelorgan 'is fed and then the loop is consumed without

As it is supplied with further film during this time and at the same time the lower loop is formed by the switching element.

There are now cinema sets are already known that have a film threading device with automatic Looping devices and a hand-operated device for moving the loop forming devices from the operating position into the threading position and film actuated means for returning the looping devices have in the operating position.

For the formation of the lower film loop during automatic threading according to the invention is between indexing element and Synchronization device a movable guide runner coupled to the other threading elements provided, which swiveled out in the operating position, swiveled in when threading is and with a wall forms a narrow guide channel for the film, while the synchronizing device and the sound path are provided at the scanning point with pressure means for the film, which also with the other threading organs coupled, but except during the threading process Are effect, and further is the sound path of one forming the film loop on this and temporarily absorbing baffle, from which the film is surrounded by the next winding or running winding device is removed.

The invention is shown in the accompanying drawings in one embodiment schematically illustrated:

Fig. Ι is a general elevation view of the major parts of the invention in connection with FIG a cinema device of otherwise known type,

Fig. 2 is a diagram of the image window,.

Fig. 3 a diagram of the sound window,

Fig. 4 is a cross-section through the Tori window of Fig. 3;

Fig. 5 shows the mode of operation schematically

of the threading release mechanism in the egg threading position titid T; "'_ *""".> Fig. 6 in the. Operating situation. In Fig. Ι io denotes the frame of the machine, a lamp housing 21 is provided for the projection of the images, which is equipped with condenser lenses, lamps and the details of a known type that do not belong to the invention.

The film feed reel is at 22 above the frame of the machine and the take-up reel shown at 23.

For pulling the film off the reel 22 and sending the film through the machine when threading in, as it is during operation, is a continuously revolving one Sprocket 24 and for pulling the film through the lower part of the machine and in particular around the sound reproduction drum there is a similar one continuously revolving Sprossenrad 25 provided. These two sprout wheels are through one of one Motor driven by a common shaft set in rotation. The sprout wheel 25 is driven by a mechanical filter. As part of the drive mechanism for the Sprossenrad 25 is a flywheel 26 directly with the shaft of this Sprossenrades 25 connected.

The image projection device comprises the image window 27, on which the film through the Switching device 28 is passed by intermittently. The switching device 28 is driven by the usual drive motor.

A light source 29 is used to reproduce the sounds recorded on the film provided within the sound reproducing drum 30. The light from the source 29 is on the film 92 in the sound window 31 is focused by means of the lens system 32. A optical system with the objective lens 33 throws the image of the illuminated film on the photoelectric cell 34 and contains, in a known manner, a diaphragm with a slit, onto which the image of the film is thrown. The light from this gap is on the photoelectric cell thrown. Fluctuates the light intensity change the resistance of the cell and operate a sound reproduction device. . ■.

To an influence of the intermittent movement of the film on the image window 27 on the To prevent film on sound window 31 and also to keep the film in contact with the To hold playback drum 30, a damping roller 35 is provided against which the Film is pressed by the pressure roller 36. The pressure roller 36 is on one arm of the Lever 37 attached for the actuation of the Einfädeiäuslösüng, while the lever 37 I is rotatable in 38 and by a spring 39 presses the pressure roller 36 against the film.

A funnel-shaped guide 40 guides the film to the upper sprout wheel 24. Behind the Sprout wheel 24, the film is guided through the upper loop guide 41, the more movable Part 42 is movable from the position shown in solid lines into the dashed line. The film is so between the separable Parts of the picture window 27 and guided by the lower loop guide 43, the more movable Part 44 is movable from the position shown in solid lines into the dashed line. ·

In order to guide the film around the playback drum 30, the guide 45 is provided, which at their lower section a greater distance from the drum surface than at. other sections. This results in an accumulation of the Film between the image window 27 and the damping roller 35 allows. About the film from the playback drum 30 to and around the sprocket 25 is the Guide 46 is provided, with the release lever 47 protrudes. The pusher 47 engages the hook 48 on the lever 37 and during threading is urged into engagement with the hook by the pusher spring 49.

Since the film is bent in a curve during its run around the sprocket 25, it has sufficient rigidity to adjust the pusher 47. After the lever 37 has been moved into the operating position by the spring 39, the The pusher spring 49 exerts no further pressure on the pusher 47, so that the latter does not presses on the film.

A take-up mechanism is provided for attaching the end of the film to the take-up reel 23 50 provided.

According to Fig. 2, the image window of two fixed parts 75 and 76 with flanges 73 and 74, 20 for attachment to the in Figure ι. Illustrated frame The moving picture pressure pad 77 is a U-shaped body, usually against the part 75 is pressed by the flat pressure pad spring 78. The film is thus pressed by the cushion against the part 75, openings 79 and 80 are provided in the part 76 and in the cushion 77 , and an opening (not shown) is provided in the part 75. The light is projected through the film and the lens 72 onto the screen through all of these openings.

In order to remove the pressure pad 77 from the film against the pressure of the spring 78, the pressure pad is provided with pins 81 and 81 'at the opposite ends.

A cylindrical body 82 is supported on a pin 83 which is screwed or otherwise attached to the machine frame. The body 82 has an arc slot 85 in its surface and is operated by a lever 84. When the cylindrical body 82 is rotated clockwise, the pin 8r 'is gripped by the end of the slot 85 and thereby moved to the right to release the pressure of the pad 77 against the film. Similar movement is imparted to the upper end of the cushion 77 by the arm 86 which has a bifurcated portion in engagement with the pin 8r '. The arm 86 is attached to the shaft 87 which is supported in bearings 88 on the flange 74 of the fixed part 76. A similar arm 89 is attached to the upper end of the shaft 87, the forked end of which carries the pin

zo 8r and thus · transmits the movement of the lower end of the cushion 77 to its upper end. The movable guide portion 44 is attached to the cylindrical body 82 so that the portion 44 is moved to its dotted position of Fig. 1 when the body 82 is rotated counterclockwise to cause the pad to apply pressure to the film.

According to Fig. 3 and 4 sits in a section of the surrounding the playback drum Guide 45 the sound window pressure pad 90, which is slidably mounted by means of eyes 96 on pins 91 which are attached to the yoke 95 are. The sound window has two degrees of freedom and is created by the pressure pad springs 93 pressed against the film 92. A lip 108 of the pressure pad is through the springs 94 surrounding pins 91 are pressed laterally against film 92.

♦ o To the pressure of the pressure pad 90 on To pick up the film during threading, the yoke 95 is provided which is loose is attached to the pressure pad lever 103 by means of a pin 102, which is elongated by a Slot of the yoke is inserted through into the lever. If the lever is in the operating position, the yoke 95 can move freely move in either direction, and the pad 90 can freely slide onto the film 92 underneath the influence of the springs 93 press. The lever 103 is articulated to the frame 20 in 104.

A lever is used to release the side pressure of the pressure pad 90 on the film 92 101 on the guide 45 through the supports 100 attached. An arm of the lever 101 touches the head of the pen 102 and the other arm a flange 98 on the pressure pad 90. Therefore, when the pad lever 103 is moved, the pin 102 engages the lever 101, and the pressure pad 90 is displaced laterally against the pressure of the springs 94, before the pin 102 catches the end of the elongated slot in yoke 95 and the pressure pad moved away from the film * against the pressure of the springs 93.

For the transillumination of the sound track of the film 92 through the optical system, a Cutout 97 is provided in pressure pad 90.

Fig. 4 shows the lever 103 in the operating position, the springs 94 the pressure pad 90 to the right and the lip 108 pushes the film 92 against the side of the lips 105 of the guide 45 presses.

The film slides on cut-out pre-cracks 106 of the playback drum 30 and on protrusions 107 of the pressure pad 90.

Figs. 5 and 6 show the threading and operating position of the threading release mechanism according to the invention. The pressure roller 36 is mounted on the threading release lever 37 rotatable in 38 and is usually pressed against the damping roller 35 by the spring 39 which is connected between the pin 203 of the lever 37 and the pin 204 attached to the machine frame. The lever is held in the threading position according to FIG. 5 by the pusher 47 which engages the hook 48 of the lever and is held in place by the spring 49. In this position, the lever lies against the stop 201, while the stop 202 limits the movement of the lever 37 when it is in the operating position of FIG. Opposite the arm of the lever 37 on which the pressure roller 36 is seated, a second arm of the lever is connected to the link 206 'by the pin 205.

The other end of the handlebar 206 has a slot 207 which has a pin 208 on the in 104 on the machine frame articulated sound window pressure pad lever 103 detected. If the When lever 37 is in the position of Figure 5, pin 208 rests against the inner end of the slot 207, and the pressure pad lever 103 is moved against the tension of the spring 211, the one between the pin 212 on the machine frame and the pin 213 is attached to the lever 103. The pin 102 on the lever 103 engages into an elongated slot of the yoke 95 in order to move it away from the surface of the clay drum 30, to allow the film to move between the clay window pressure pad 90 and the drum surface 30.

A pin 215 at the top of the lever 103 engages in a slot in lever 214 which is rotatably attached to the frame. That the other end of the lever 214 has a pin 216 which engages a slot in the crank 84, which operates the movable portion 44 of the lower loop guide. An arm 220 of the lever 214 gives the handlebar 221

a movement associated at its upper end 222 with aem "movable portion 42 of the Upper loop guide is connected, which is hinged in 223 on the SiäscHiherir'ahmen. A pin 224 on the lever 37 engages in an elongated slot 225 of the handlebar 226, which by means of of the articulated connection 227 the upper guide part 50 of the receiving mechanism around the one attached to the machine frame

ίο Pin 228 against the tension of the spring 240 moved between the guide part 50 and the also on the machine frame located pin 241 is switched. The guide part 50 is in this position

■ 15 held the pawl 229, the one on Machine frame attached hook 230 detected.

A link 231, which is connected to the guide part 50 in 227, gives the lower guide 233 a movement about the pivot point 234 on the machine frame. One arm of the guide 233 is connected to the handlebar 231 at 232.
The curved lower guide 234 is fastened in 235 to the lower end of the guide part 50. The arm 236 protruding from the lower guide member 234 gives the arm 239 of the pawl 229 a movement through the link 238, so that when the lower guide 234 is rotated clockwise, for example. B. the Kinke229 is triggered by the accumulation of film on the take-up reel and the parts assume the position shown in Fig. 6 under the influence of the spring 240.

The machine works as follows:

Formation of the loops

The film is fed from the feed reel 22 through the guide 40 and the image window 27 guided by means of the continuously rotating sprocket wheel 24. He is through the suitable guided tours, which show the general

+5 my form of the eventually required Have loop and considerable leeway for the free movement of the film. At the The upper loop guide opens the movable section when the threading is completed 42 to the outside, in order to ensure the complete clearance of the film loop, when the image projection starts.

During the threading, the pressure pad 77 of the picture window must be withdrawn. This is done in conjunction with the work of the lower loop guide mechanism. One side 44 of the lower loop guide is hinged at 82 near the lower partition of the picture window. The arched seat 85 is provided in the part 82 of the 'movable guide 44 and rotates around the pin 83. The pin 81' attached to the lower end of the picture window pressure pad 72 protrudes into this groove and when the movable guide part is pivoted about the pin from Detected and entrained slot end, whereby the pressure pad 77 is displaced against the spring tension. This allows the film to pass freely between the fixed picture window part 75 and the movable pressure pad 77.

The movable part 44 of the lower loop guide forms in the extended The position shown in Fig. 1 shows the lower side of the lower film guide. If the Machine is working, this part rotates to the right as shown by the dotted lines, thus causing the spring 78 to press the pressure pad 77 against the film.

During threading, the upper sprocket 24 guides the film downward to the lower part of the picture window. At this point, the switching device 28 takes effect and promotes the film intermittently through the rest of the mechanism. The pressure exerted by the film against the indexing device by the flat spring 78 with the window open is insufficient to damage the film if the indexing device does not properly engage the rung holes in the film. The pressure pad 77 can therefore move further to the right in the threading position, as shown in FIG. 2, so that the film can release the tips of the switching device 2S. When the pressure pad 77 is triggered, however, the engagement between the film and the switching device is inevitable.

The opening of the movable section 42 of the upper film guide forms the upper one Ribbon.

The lower loop is formed in a different way. The lower guide, through which the film passes from the image window 27 to the drum 30 is narrowed and does not allow free movement of the film other than easy passage. While When threading, the movable portion of the guide 43 is closed, and the film is through him around the damping roller and through the drum guides 45 to the lower continuously rotating sprout wheel 25 pushed. The one in the clay drum guides available space 'is sufficient to allow a considerable slack in the material to be rolled up Film.

After the threading is complete, the pressure roller 36 presses the film against the damping roller 35, and further film is prevented from running around the dampening roller until the lower sprocket 25 has consistently removed the entire film from the clay drum.

This allows the intermittent switching device 28 to dispense a certain amount of film pile up between the image window and the cushion roller 35. The switching device continues to deliver film, which piles up and forms a loop in the room, which is created by opening the movable guide section 44. The time required for this determines the amount of film which will accumulate, and thereby the size of the loop.

Film actuated release The entire threading release mechanism is operated only by the lever 37, which is used for threading the film by hand is pulled down and held in the position of Fig. S by pawl 47-48. Of the Pusher 47 has a lever in a central part of the lower sprocket lies. As soon! the film is picked up by this sprocket and led around, it is also brought under the pusher, and due to the stiffness of the film bent around the sprocket, the Lever raised and lever 37 disengaged. Stands while the image is projected the pusher 47 is not under a spring tension that would press it against the film, since the one attached to the lever 37 The pusher spring 49 is not in contact with the pusher 47 in the raised position.

Movie recording mechanism

With the threading release lever 37 is the lower film take-up mechanism 50 connected. The take-up guide goes down and partially around the take-up reel pushed by the handlebar 226, which is gripped by the pin 224 of the lever 37 working in the elongated slot 225. the Triggering of the lever 37 by the action of the sprout wheel described above 25 running film has no effect on the recording guide mechanism, since the pin 224 slides freely in the slot 225 when the lever 37 is in its operative position emotional. The recording guides therefore remain in their position until the film has wound up to a certain amount, after which the tours are triggered independently.

The upper receiving guide 50 has a channel profile and works with lower guide 233 to hold the film against the hub to direct the drum. In several places around the circumference of the hub of the take-up reel spring-loaded pistons are arranged, the ends of which protrude slightly above the surface of the hub. When the film is down onto the drum and partly around it through the curved section of the lower one Receiving guide 234 is conveyed, one of these pistons fits into a hole at the end of the Films, as the drum, with. driven slightly faster than the film! will. The cross section of the lower receiving guide is designed so that the piston can go through freely, even if the guide is in contact with the hub at their Edges is. After the film has engaged with a plunger and securely attached is caught in the same, the film is automatically placed under sufficient tension, to depress all subsequent spring-loaded pistons and the second position of the The film also depress the plunger that gripped the end of the film. After a predetermined amount of the film is wound onto the reel, it is yours Increased diameter so that the lower guide is lifted around the joint 235 and as a result: the guide mechanism is disengaged. Then be through the spring the take-up guides moved to the position of Fig. 6, where the take-up reel is free.

Claims (4)

Patent claims: i. Process for the formation of the behind the intermittently switching organ lying film loop in a cinema machine for the automatic threading of a recording medium, z. B. Films, with Sound device and one between the picture window and this, driven by the film Synchronization device, characterized in that to form the lower Film loop the film is initially guided without loops from the picture window to the sound track and forming a loop the Nachwickel- or Aufwickelorgan is fed and that this loop then is consumed without being fed any further film during this time is, and that at the same time formed by the switching element, the lower film loop will. 2. Apparatus for carrying out the method according to claim 1 to a cinema set comprising a film threading device with automatic loop forming devices and a manually operated device for moving the loop forming devices from the operating position to the threading position and a device operated by the film for Returning the loop forming devices to the operating position, characterized in that between Indexing device and synchronizing device a movable guide runner (44) coupled to the other threading elements is provided, which is swiveled out in the operating position, swiveled in when threading and with a wall (43) forms a narrow guide channel for the film that the synchronizing device and the sound track is provided with pressure means for the film at the scanning point, which are also coupled to the other threading organs, but are ineffective during the threading process, and that the sound path from one of the film loops on this forming and temporary receiving baffle (45) is surrounded, from which the film from the rewinding or winding device is removed. 3. Cinema apparatus according to claim 2, characterized by a receiving reel (23), which cooperates with a threading or guide mechanism (233, 234), the manually operated device (37) into the threading position is movable for the purpose of guiding the film to the take-up reel (23) and · after a predetermined increase in film on the take-up reel (23) e.g. B. through the mediation of the guide device (234) with a ratchet device (229,230) connecting link (238) from the guide or threading * position is moved into the · operating position. 4. Cinema apparatus according to one of the claims 2 and 3, characterized by a pressure pad (90) on the sound window (97), which on the film z. B. by a spring connected to the guide (45) (93) is printed and slidable on Pins (91) of a yoke member (95) is supported by means of springs (94), around the lip (108) of the pressure pad (90) against the edge of the film press and thus this in contact with the lugs (105) of the guide (45) to keep and 'get out of the threading into the operating position by arranging a Can move the release lever (103) which is in drive connection with which the pins '(91) supporting yoke (95), and further characterized by a lever (101), which is rotatably mounted on the guide (45) around the pressure pad (90) with lip (108) laterally against the pressure of the springs (94) to move under the influence of a pin (102) on the lever (103). 1 sheet of drawings