SU124972A1 - Reading device - Google Patents

Description

Contact or photoelectric reading devices are known for program input on a perforated tape for controlling machine tools, for which a telegraph tape or a film is used. In order to ensure the compactness of perforations in a frame, the usual principle of sequential reading of vertical rows of perforations of mites with the commutation of these rows along the corresponding memory elements (relay, ferritic, etc.) is used. The principle of operation of such reading devices. Contains a number of significant drawbacks. In these devices, switching circuits are very complex and not reliable enough; The frame reading speeds by the sum of the speed of the elements of the memory devices are limited, since for reliable operation of the relay circuit it is impossible to emit pulses shorter than 0.1 sec. The use of such reading devices requires the use of special mass storage devices.

The described reading device does not have these disadvantages. In this device, a mechanical locking device in the form of a plate with holes entering the grooves of the push rods is used to memorize the program and to enable data entry of the new frame of the tape during the processing of the previous one. In order to increase the speed of reading and obtaining a simple and reliably working design of a software device, the following principle of operation is used in the proposed reading device for entering a program on a perforated tape.

Building has two frames of memory. Reading from frame No. 1 occurs after reading from frame No. 2 by switching over the signal supplied to the electromagnet of the reading device. The read head provides locking of all pins in the upper or lower positions, which allows the device, in addition to reading functions, to No. 124972.

raise memory functions. The pulses for reading the first two frames are manually applied, and then the device operates automatically.

FIG. 1 shows the kinematic diagram of the device proposed; in fig. 2 is a view along arrow L in FIG. one; in fig. 3 - section reading head.

A drive sprocket, a winding roller and a distribution roller, are driven by an electric motor.

The rotation of the drive sprocket and the distribution roller is carried out by gear couplings / and 5.

At the end of the readout from the memory No. I, the switch to the readout from the memory No. 2 takes place, in this case a pulse is signaled indicating the presence of a switch, which is fed to the electromagnet 3 of the reading device. The electromagnet raises the lever 4 holding the right -nojtoBHHy coupling 2 and the spring delivers the right half of the gear until it engages with the continuously rotating left half. When switched on, the distribution roller 5 begins to rotate and the cam 6 presses the rotation-turning lever 7 of the sprocket 8. This engages the single-turn gear coupling /. The asterisk 8 begins to rotate as the ribbon passes. After making exactly one revolution, the gear clutch is turned off, stretching the tape exactly two frames. The device operates from the drive 9. The kinematic relations are chosen so that the distribution roller 5 rotates three times slower than the sprocket 8, therefore, when the sprocket rotates 360 °, the roller rotates 120 °. After the rotation of the sprocket is turned off, the spreading roller continues to rotate and the next 120 ° data is entered in memory No. J data is entered as follows: after the lept is completed, i.e. after turning the cam 6 by 120 °, the lever turns 10 latching lugs 1L The lath releases pins J2 and they are pushed upwards with springs - the previous data is reset. After that, the push lever / 5 starts to fall, which lowers the tape on the pins. In those places where a hole is punched in the tape, the pin remains in the upper position. After the push lever is fully lowered, the locking lane 11 is released, which locks all the pins in the upper or lower position, i.e. where the pins are locked in the lower position, the contacts 14 will be closed, and where the pins are locked in the upper position, the contacts will turn open. Thereafter, the push lever (rises, and the gear clutch 2, turning 2/3 turns off, is turned off.

At the end of reading from memory No. 2, switching occurs to reading from memory No. /. At the same time, an impulse is emitted which hits the electromagnet of the reading device and turns on the gear coupling 2. The distribution roller starts to rotate again and at the same time the cam 15 presses the lever of the locking bar of memory 2, releasing the pins. Then, the push lever 13 is lowered (data is entered), the locking bar is released and the push lever is raised. Having completed the last third of the turn, the clutch 2 is disconnected. At the end of the readout from memory # /, the cycle is repeated. At the initial tape input, the pulses in the electromagnet 5 are read manually by a special button on the reading of the first two frames, after which the machine begins to work automatically. The locking plate 11, due to the presence of two grooves on the studs 12, makes it possible to lock them in one of the two extreme positions. After raising the pressure lever, frame 16 lifts the tape, releasing it from the pins.