SU453714A1 - DEVICE FOR READING GRAPHIC INFORMATIONMifm Fund - Google Patents

Description

one

The invention relates to the field of automation and computer technology, in particular to devices for reading graphic information.

Apparatuses for reading graphic information are known, comprising a drum with a recording medium, an optical unit, a handle connected to the viewfinder, a register of ordinates connected to a memory unit.

A disadvantage of the known devices is their low accuracy, due to the fact that the linear movement of the viewfinder is first converted into an electrical voltage, which is then converted into a digital code using a digital voltmeter.

In order to improve the accuracy of reading graphic information, the device contains an accurate counting drum of the ordinates connected to a handle (steering wheel) and an ordinate register, a coded ordinate drum coding connected to the exact count of the ordinates and the ordinate register, and a control unit connected to ordinate and memory block.

FIG. 1 shows a block diagram of the device; and in fig. 2 - constructive execution of the coding drums rough and accurate counting of the ordinates.

The device contains a drum 1, on the surface of which the recording medium is placed.

(graph under study), optical unit consisting of lens 2, mirror 3, illuminator 4 and matte screen 5, handle 6, viewfinder 7, coding drum 8 accurate reading of ordinates, coding drum 9 of coarse reading ordinates, control unit 10, register ordinate 11, gear 12, memory block 13. The device operates as follows. The operator rotates the handle (steering wheel).

The angular movement of the wheel through the gear 12 causes the angular movement of the coding drums 8, 9 and the linear movement of the reticle. When the viewpoint is aligned with the middle of the line of the graph, a signal is given

the readout to the control unit 10. On the leading edge of the readout signal, the control unit generates a signal to clear the register of ordinates 11 and a signal to read indications of the encoding bar: bans and to record these indications of the NII in the register of ordinates. On the falling edge of the read signal, a digital code from register 11 is transmitted to memory block 13.

The mechanical part of the device (Fig. 2) consists of an electromagnet 14, contact groups

15 and 16 of the coarse-reading coding drum 9 and the precise-reading coding drum 8. On the side surface of the coded drums of coarse and precise count, holes are made that strictly correspond to

binary-decimal code with weights 8-4-

2-1. The holes on the drums correspond to the code “О, and the local parts of the drums correspond to the code“ 1. On the precision reading drum, numbers were coded from O to 99. On the coarse reading drum, from O to 19. Thus, the movement of the viewfinder from O to 200 mm corresponds to a change in the readings of the coding unit from O to 2000. The core of the electromagnet 17 is bent. The core is rigidly connected to the levers 18 and 19, which press the contact groups 15 and 16 to the drums. Each contact pair in the contact groups has a needle 20, which with the insulator 21 is attached to the bottom contact of the pair. The needles that fall into the holes do not close the contacts, i.e. the code "O" is removed from the contact pair. Needles that do not fall into the holes, press on the bottom contact, which closes with the top, which allows you to remove the code "1. A precision drum is connected to a coarse drum by transferring a Maltese cross and gears 22. In one complete turn of the precision drum, the coarse drum rotates 1/20 of a turn about its axis.

Subject invention

A device for reading graphic information containing a drum with a recording medium, an optical unit, a handle connected to a vizier, an ordinate register connected to a memory unit, characterized in that, in order to improve the accuracy of reading graphic information, it contains an encoding drum of an exact reference of ordinates connected to a handle and a registrar of ordinates, a coded coarse ordinate drum code, connected to an accurate ordinate co-ordinate register and an ordinate register, and a control unit connected to an ordinate register and b memory lock

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