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Description

one

The invention relates to the field of cinematography and radio engineering and can be used in tape-making mechanisms of magnetic and thermoplastic recordings, motion-picture and film projection equipment.

Tape winding devices are known, comprising a transporting drum and a double-shouldered spring-loaded lever, on one of whose arms a driving roller in contact with the tape roll is installed, kinematically connected with a drive mechanism.

In order to increase the uniformity of winding and preserve the image quality on the tape in the proposed device, the lever is curved, the shoulders of which are in the form of forks are placed respectively between the rims of the transporting drum and the driving roller, with the clearance between the ends of the forks and the pulleys connected between a flexible transmission.

FIG. 1 depicts the described device, a plan view; in fig. 2 - a section along the line of the centers: a gear drum - a leading roller - a roll of a film.

The device consists of a gear drum / with two crowns 2 and 5, near which the holding rollers 4 and 5 are placed. The film strip 6 is placed in roll 7 and has contact with the drive roller 8 moving

along the radius R. The roller consists of two smooth rims 9 and 10, made out of material with a large coefficient of friction, touching the edge of the non-subject part of the film. The curvilinear lever // has two forks 12 and 13, included with rotational supports between the rims of the driving roller and the toothed drum /. At the bend of the lever, the bypass rollers 14 are covered, covered by the bracket 15. The drive belt 16 is placed on two pins 17 and 18 and the bypass rollers 14. The shaft 19 transmits the rotation from the drive 20 to the pawl 17 by means of an overrunning clutch 21 of unilateral action. Shaft 22 is rigidly connected to pulley 18.

The crowns 9 and 10 have restrictive cheeks 23 and 24. Unlike the same diameters of the cheeks / 7 and 18, the diameters of the crowns 9 and 10 should be slightly larger than the diameters of the crowns 2 and 3 of the toothed drum /. The lever is connected to the spring 25, which presses the drive roller with a certain force Q to the roll 7.

The device works as follows. The tape 6 is fed by the toothed drum 1 to the roll 7, which is rotated by the driving roller 8.

The actuator 20 rotates the shaft 19. Through

overrunning clutch 21 movement is transmitted to

Shchiv 17 and the drive belt 16 (in FIG.

has the form flat with a fillet) which.

in turn, rotates the pulley 18, the shaft 22 and the crowns 9 and 10.

The required tension of the film in roll 7 is determined by the formula:

,

where Q

clamping force of the drive roller to the roll, f - coefficient of friction pairs.

The tension of the film is also determined by the difference in the diameters of the crowns 9 and W of the crowns 2 and 3, which in their circumferential speeds V2 and Vi is 2-3%.

The subject of the invention is a tape winding device comprising a transporting drum and two shoulders under a spring arm, on one of whose arms a driving roller in contact with the tape roll is installed, kinematically associated with a drive mechanism, characterized in that, in order to increase the winding uniformity and preserve the image quality on the tape, the lever is made curved, and its shoulders are in the form of forks and are placed respectively between the rims of the transporting drum and the driving roller, and in the gap between the ends there is a fork, to the mouth ovleny on the axles of the drum and .rolika schkivy associated by a flexible .peredachey.

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