SU367402A1 - BATTERY PROTECTOR - Google Patents

Description

one

This invention relates to the field of film engineering.

There are known film projector obturators containing two disks mounted on parallel shafts kinematically interconnected.

The precursor: This obturator is different in that the disk shafts are located symmetrically with respect to the plane passing through the edges of the blades when they cross the axis of the light flux, and the disks are placed on opposite sides of the bracket carrying the shafts.

This simplifies the design and reduces the noise while maintaining maximum transmittance.

FIG. 1 shows the device, front view; in fig. 2 shows a section along A - L in FIG. one; in fig. 3 shows a section along B - B in FIG. 2; in fig. 4 is a schematic of the overlapping blades of the obturator of a shuttered light beam.

The obturator is assembled on a bracket / fastened with screws to the plate of a film projector. Kinematically, the device is connected to the shaft of the eccentric of the Maltese mechanism (not shown) of the film projector by means of an elastic coupling, the drive part of which consists of a metal disk 2 and a rubber ring 3 fixed in a cylindrical undercut of disk 2. In the rubber ring 3 there are holes 4 in which fingers enter, set2

hinged on the driving part of the elastic coupling placed on the shaft of the eccentric of the Maltese film projector mechanism. On the outer cylindrical sharpening of the disk 2, one of the constituent shutters 5 is located, pressed against the front part of the disk by means of ring 6 and screws. The disk 2 is attached with screws to the flange of the shaft 7, on which a pin 8 is mounted with a key, causing the rotation of the pin 9 placed with a key on the shaft 10. A disk // is attached to the flange of the shaft 10, on the outer cylindrical sharpening of which a second component obturator 12, pressed against the end surface of the disk with a ring 13 and screws. Both shafts 7 and 10 of gears 8 and 9 rotate in ball bearings 14 and 15 mounted in recesses of bracket 7 and cover 16 (Fig. 3). Shafts 7 and 10 are parallel to each other, as well as to the optical axis of the light beam being etched. The obturators 5 and 12 are mounted on opposite sides of the bracket /, so that both components of the obturator can rotate freely.

The device works as follows.

When the film projector is operating, the Maltese mechanism eccentric shaft rotates through the elastic coupling and disk 2 to shaft 7. This shaft drives the rotation of the pinion 8, which transfers the gear Z and gear 9 to the shaft 10 and through it disk 11. The disks 2 vi 11 rotate the constituent obturators 5 and 12 fixed to them, the obturators rotating in opposite directions.

When using a double obturator consisting of two single obturators rotating in opposite directions, the maximum transmittance is achieved if (as shown in Fig. 4) the respective edges of the vanes of the constituent obturators simultaneously intersect the optical axis Oie of the curved light beam and at this moment they lie in the same plane passing through the axis of the light beam. This requirement is satisfied by making the blades of the components of the shutters of the appropriate shape and their proper installation on the disks. The point through which the plane passes, enclosing the respective edges of the blades of the constituent shutters at the time of intersection

the axes of the light beam being etched by them can be chosen arbitrarily.

In order for the blades of the components of the shutters to be the same, it is necessary that the plane passing through the edges of the blades of the components of the shutters at the time they intersect the axis of the light beam divides the distance between the shafts of the shutter in half.

Subject invention

A film projector obturator containing two discs mounted on parallel shafts,

kinematically interconnected, characterized in that, in order to simplify the construction and reduce the noise and simultaneously preserve the maximum transmittance, the disk shafts are located symmetrically relative to the plane passing through the edges of the blades when they cross the axis of the light flux, but the disks are placed on opposite sides bracket carrying shafts.

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