SU13645A1 - Device for controlling the speed of advancement of the film - Google Patents

Description

To regulate CKOpoci; n advancement, neither the film (in particular, the sounding film;) Both in the filming and in the projection, and as you know, it was proposed to use the flywheel of the rotational roller, but which: is moving the film. Such a device for regulating the speed of film propulsion is ocisano, for example, in the English patent L 249627 from 20 nvd, p 19: 2.5 g. "When starting apparatus, in which a rotating body was used to control the speed of advance of the film, ex. , the flywheel, the entire tranelorting mechanism and the film itself relatively quickly: acquire a final speed, while in order to achieve / the same speed with the flywheel; because of the fact that the flywheel is floated and unwound only by the action of the motion of the film, at the beginning of the apparatus’s operation there is an OR splitting it on the roller combined with the flywheel, which causes rapid wear of the perforation, or the film is subject to growth Givting usiladm, which shogut tore him.

To eliminate this drawback, it was proposed to connect the flywheel with the transport mechanism during the start-up of the clutch assist provided by the centrifugal regulator. Such an ode to adaptation is very much complicated. the device, everything gives sufficiently reliable clutches between the flywheel and the driving mechanism at the time of launching the device ..

In the proposed device for controlling the speed of film advancement between the flywheel and the driving mechanism, which serves to start the flywheel, automatic grip has been changed, and the mechanism used to promote the film can be used as the appropriate driving unit. The start of the flywheel is carried out using a special trigger mechanism (free wheel), with which the flywheel spins up to a speed slightly lower than the final speed. After the flywheel thaws the specified speed, its further hostility is already carried out by the motion of the film itself, but the initially established grip between the driving mechanism (the free wheel) and the flywheel is broken

In the drawing of FIG. - 1 depicts the scheme

one of the known devices for controlling the speed of advancement of a sounding film in a film set or projection apparatus; FIG, side view and partial section of the proposed fixture; FIG. 3 is a rear view of a part of the fixture; FIG. 4 is a side view and partial section of a modified device; FIG. 5 is the same, rear view. With the passage in the apparatus -) film 1 is unwound from the feed; reels 16 to it, pass through / upper 2, past personnel window 3 to roller C sitting on one shaft 5 with flywheel 6, or directly connected to the latter. C e) Olik 4 film loop passes through the roller 7, which is mounted on the end of the shoulder 8, rotating the axis around the stationary pin 9 and pulling it. With the help of the spring 15 which ejects, the part of the film from the roller 4, thanks to which the latter forms a bend between the roller 4 and the bottom roller 10, from which the film passes the receiving bobbin 11.

Rollers 2 and 10 are driven into rotation in any way, for example, by means of an electromotor 17 coupled to shaft 18 of roller 10 by means of a gear or other gear 19.

With the passage of the film 1 on the roller 4, the rotation of the latter is transmitted to the flywheel 6.

According to the invention, the rotation of the flywheel 6 is achieved by using a special device, the device of which is as follows.

The flywheel 6 (Fig. 2) is rigidly connected to the shaft 5, on which roller 4 is also planted. Shaft 5 is located in the frame of the filming (recording) or projection (playback) apparatus in the channel 20, and the disk 21 is connected to the flywheel hub 6 go with the shaft 5. On the neck 22 of the channel. 1 20 there is a day wheel 23, which is rotated by means of chain 24, for example, from the axis 25 of the motor 17 (Fig. 1 and 3). Instead of the sprocket 23, a gear wheel can be used. A wheel correspondingly associated with the axle 25. On the valuable wheel 23, two friction cams 27 (Fig. 2 and 3) are rotated around the TIPS 2b. The disk, 2U, as a result of which friction is formed between the joke and the cams, enough to bring the flywheel 6 together with the shaft 5 into rotation from the sprocket 23, rotated, for example, by the motor 17. The gear ratio between the driving mechanism and the wheel 23 is determined in such a way that the maxi The overall speed — rotation, combined with the wheel 23 to the flywheel 6 at the start time — was slightly less than the final speed at which the flywheel had to rotate with the action of the film circling around the roller 4. Upon reaching the flywheel 6, the maximum rotation speed reported to him by the chain wheel 23, further the acceleration is communicated to him by the action of the moving film, at which the disk 21 is spinning relatively. valuable wheel 23 in the direction indicated in FIG. 3 by the arrow, which causes the cams 27 noBjpty around the pins 26, overcoming the tension of the springs 28. This achieves a ramp up of the flywheel ..6 and the sprocket 23, after which the flywheel is driven by the action of the film, which informs the roller 4 and the flywheel 6 associated with it rotational speed, exceeding the rotational speed acquired by the flywheel FROM the drive mechanism of the LS 23. During a normal machine, the disk 21 slides with its surface over the cones of the cams 27, and the friction caused by this does not cause significant deceleration and m: ahovika ..

 To avoid friction between the cam; Kami 27 and the surface of the disk 21, the proposed device can be modified as follows. The cams are made in the form of dogs 27 (Figs. 4 and 5) located inside the concentric recess 30 of the sleeve 29 of the horn (flywheel) 6, and the disk 21 is supplied with decal teeth, connected to the wheel of the 23. cable transmission and located in the nazadap notch 30 from the side of the dogs 27. The wheel 23 and the ratchet disc 21 connected to it revolve around the shaft 5 of the flywheel 6.

In the modified device (Figures 4 and 5), three ratchet / x dogs 2 are used, symmetrically arranged around the axis of the flywheel 6. By such arrangement of dogs, the advantage is achieved that, with a fixed flywheel, one of the ratchet dogs 27 always, due to its weight, comes into contact with one one of the teeth of the disk 21 connected to the wheel 23, seizes one of the ratchet dogs 27 and outruns of the drive mechanism of the apparatus coupled to the wheel 23 by the cable, chain or gear transmission; ma is, Hove to vrap1; ats with the wheel 23. When the wheel 23 reaches its maximum chtssla. revolutions, a smaller final number of revolutions of the roller 4, in which the film moves, the latter begins to report further acceleration to the flywheel 6, due to which it rotates relative to the screw disk 21 in such a way that the snoring dog .27, which was originally linked to one of the the teeth of the dpska 21 is released and, due to the effective centrifugal force, comes in contact with the outer edge of the recess 30. All ratchet pawls 27 remain 7 in contact Q called the outer edge until the flywheel is driven film voltage and rotates at a speed, "a superior conductive izv.estny

the low limit, when the weight of one dz of ratchet dogs becomes sufficient for: in order to bring it back into separation by the teeth of the ratchet disc 21.

The subject of the patent.

1. An appliance for controlling the speed of advancement of a film by means of a flywheel, etc., characterizing the; that the same wheel 23 is mounted on the same axis as the flywheel, driven from the axis 25 of the motor 17, provided with cams 27 with a spring 28 to press them against the disk 21 to form a friction sufficient to drive the flywheel 6 (Fig. 1-3 ).

2. Change - the fixture specified in paragraph 1, characterized by the use of dogs 27, located in the recess of the sleeve 29 of the pulley 6 and intended (lh for interfacing with the teeth of the disk 21, with the goal that the dogs when the flywheel reaches its maximum rotation speed with teeth of a disk 21 by the action of centrifugal spl of Fig. 4 and 5).

 . / and to the patent of the in-th company, „Akts ,. sounding films of the island of electric number 13645.

fip 5.

Fig2