SU93937A1 - Device for mechanically limiting the length of the rewindable tape, for example, in an oscilloscope camera - Google Patents

Description

DEVICE FOR THE MECHANICAL LIMITATION OF THE LENGTH OF THE TERMINATED TAPE, FOR EXAMPLE, IN THE CAMERA

OSCILLOGRAPH

December 6, 1951 for Le 2061/444684 to the USSR Ministry of Geology was published. Published in Bulletin of Inventions No. 7 for 1952.

This invention relates to devices for limiting the length of an exposed photo tape.

In the known limits of the length of the exposed photo-tape, its length depends on the speed of the photo-tape.

The described device is free of this disadvantage; in it, the length of the exposed photo tape does not depend on the speed of its stretching. This is achieved by interlacing the rotary cam, the stroke of which determines the length of the rewindable photo tape.

The drawing shows a kinematic diagram of the described device for mechanically limiting the length of the rewindable photo tape.

Gear 1 is wedged on the roller 2 of the driving friction roller 3, connected by means of clutch 4 to a handle not shown in the drawing.

A gear 5, provided with an end-toothed half coupling 6, rotates freely on the hollow roller 7. On the latter there is a serrated coupling half 8 connected to the roller 7 by a movable key 9.

Coupling the coupling half 8 with the coupling half 6 is carried out by a spring 10 moving the coupling half 8 along the roller 7. The coupling release of the coupling half 6 and 8 is performed by pressing the button 11 connected to the shaft 12. passing through the roller 7.

In the disengaged position, the coupling half 8 is held by a spring-loaded latch 13.

The cam 14 is wedged on the roller 2, and the disk 15 is fixed on the roller 16 by the pressing turn of the spring-loaded roller 17.

In the off position of the device, the pressure roller 17 does not come into contact with the drive roller 3.

When the roller 2 is rotated by means of a handle (not shown in the drawing), after the friction roller 3 obtains the required speed, the projection of the photo tape is turned on by pressing button 18. This releases the key 19 and the spring-loaded pressure roller 17, which is located under the action of two springs (not shown in the drawing), it comes in contact with the drive roller 3. Simultaneously with the rotation of the roller 17, the cam 20 mounted on the common axis will turn the latch 13 and release the coupling half 8, which will move along the roller 7 and go into eplenie with half coupling 6. Roller 2, schestern 21 and the cam 14 come to rotate. After the cam 14 has completed part of the revolution or a full revolution, its tooth will be thrust into the disk 15 and the roller 17 will move to its original position.

The angle of rotation of the cam 14 from its predetermined position against the stop of its tooth in the disk 15 determines the length of the exposed photo tape. The angle of rotation of the cam 14 is set on a scale of 22 with a knob 23.

Subject invention

A device for mechanically limiting the length of a rewindable tape, for example, in an oscilloscope camera, made in the form of an interconnected system of gears, clutches, pressure rollers and springs, the interaction of which ensures the inclusion of a tape mechanism for rewinding a certain length of tape, in order to exclude influence of the drawing speed on the length of the rewindable tape, it is equipped with a rotating cam, the stroke of which is from the set position and to the position B when the tape turning anizma determines rewound length of the tape.