SU708283A1 - Film-driving reversible machanism for toy motion-picture projector - Google Patents

Description

The invention relates to film technology, in particular to a film projector

Known tape reverse mechanisms for a film projector toys containing a gear drum with guide rollers, a film channel with spring-loaded rollers and locking teeth [1]. When moving the film, motionless teeth, sliding over it, damage it.

The purpose of the invention is to reduce film wear.

This goal is achieved by the fact that in the proposed tape drive mechanism on the axis perpendicular to the optical axis of the film projector, two swinging levers are installed, the spring-loaded roller of each direction of movement being located on one shoulder of the swinging lever, and the corresponding fixing tooth on the opposite shoulder of the other lever.

Figure 1 presents a General view of the mechanism; figure 2 is a diagram of the movement of film strip in the forward direction; figure 3 is a diagram of the movement of the film in the opposite direction. The tape drive mechanism contains a gear drum 1 and guide rollers 2. The device for intermittent movement of the film includes a curved film channel 3 and two spring-loaded rollers 4 located on the arms of the arms 6 and 7 swinging around the axis 5. On the opposite arms of the arms are located the corresponding Locking teeth 8 and 9. Magnifier 10 may be _ used to view the image. Between the film channel 3 and the gear drum 1 is a reflective surface 11 for illuminating the frame window. The gear drum _ moves the film 12, the colic 4 is provided with springs 13.

The mechanism works as follows.

When the rotation of the gear drum 1 25 counterclockwise (figure 2), the upper branch of the film 12 is stretched in the area between the spring-loaded roller 4 and the gear drum. The film, overcoming the force of the spring FROM the roller 4, will cure it until the moment.

• uoL, & 08283 as long as the perforation is not sya, aa ^ 7La1Ya | the fixating tooth * * 8. At the same time, the same roller moves the locking tooth 9 out of the working area of the film channel.

- ·. The film is released, the roller 4, rotating under the action of the spring 13 in its place, quickly pulls the film and puts it on the Fixing tooth 8 of the next perforation.

In a similar way, the mechanism also works when the gear drum 1 rotates clockwise (FIG. 3).

The presence in the mechanism of swinging levers with spring-loaded rollers and locking teeth makes it possible to freely move the film along the film channel without damage.

Sources of information taken into account during the examination

1. Patent СНА No. 3817610, class 352-129, 1976 (prototype)

Claims (1)

Claim Tape reverse mechanism for a movie projector toy, co-film carolics, and so on, and that, on purpose, on the axis, [holding a toothed drum with guide rollers, cash with spring-loaded fixing teeth, which is aimed at reducing film wear perpendicular to the optical axis of the movie projector, two swinging lever, and the spring-loaded roller of each direction of movement is located on one shoulder of the swinging lever, and the corresponding Fixing tooth - on the opposite shoulder of the other lever.