SU551593A1 - Grab mechanism - Google Patents

Description

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The invention relates to film technology.

Grab mechanisms are known in which the trajectory of movement of the transporting tooth is formed by a crank-and-crank mechanism ij.

The known grab mechanism has the following disadvantages:

various transport conditions for forward and backward movement (the trajectory of movement of the transporting tooth is concave-curvilinear, which determines the placement of the grab mechanism on the curvilinear section of the film channel, as a rule, below the personnel window);

the complexity of the design due to the need to introduce a counter-grab mechanism to ensure the same vertical stability of the film on the forward (in stretching mode) and reverse (in push mode) moves in the film channel;

a large working angle of the mechanism limiting the opening angle of the obturator.

The purpose of the invention is to reduce the working angle and provide the same transportation conditions during forward and reverse travels.

This is achieved by the fact that the mechanism is kinematically connected with a crankshaft and an additional link with a finger at the other end interacting with the main coulis and a rocker that is attached to the ball joint and the additional axis with the corresponding ends, which are kinematically connected with the finger.

Fig, 1 shows a structural diagram of the mechanism; ka fig. 2 is a schematic diagram of a mechanism for transporting a film from the side of the base; in fig. 3 is a schematic diagram of a mechanism for transporting films from the emulsion side.

The eccentric finger 1 of the leading crankshaft 2 is located in the recess of the backstage 3, swinging around axis 4. The finger 5 of the backstage 3 is located in the recess of the backstage arm 6. 9. The connecting rod 9 is connected to the crankshaft 2 via a hinge 10.

When the clamshell mechanism is working from the base of the film 11 (see Fig. 2), the hinge 10 is placed between the center of rotation

The leading crank 2 and the eccentric pin 1, and when the mechanism is operated from the emulsion film 11 (see Fig. 3), the axis of rotation 0 is located between the hinge 10 and the eccentric finger 1.

When cranking the crank 2, the eccentric pin 1 sets in motion, the rocker 3. The rocker, rotating around the axis 4, with the finger 5 mixes the rocker 6 in the direction of motion of the reels. At the same time, the connecting rod 9, receiving movement through the hinge 10 from the crank 2, mixes the slide 6 in the direction perpendicular to the movement of the film 11 with the aid of the rocker arm 8.

The design of the grabber mechanism provides a working section of the trajectory of the transporting tooth 7, which is close to a straight line.

Claims (1)

1. G. Veize. Motion Picture Camera, M., Foreign Literature, 1958, p. 217-218, fig. 239 (prototype). 1