SU911571A1 - Graphic information reading-out device - Google Patents

Description

The invention relates to automation and computer technology and can be used to enter graphic information into an electronic computer,. A device is known comprising a tablet with an orthogonal system of unidirectional current-conducting coordinate buses, a switchboard of interrogating pulses, a coordinate remover connected via a key to a control unit, an amplifier, an amplitude-phase discriminator, a coordinate register, an OR element, a valve unit, and a comparison circuit and issuing coordinates D1. The disadvantage of this device is that the connecting wires connecting the indicator coil of the coordinate remover with other blocks are undesirable in some systems of automatics and computing. Closest to the present invention is a device comprising a plan em, made in the form of two systems, mutually perpendicular reference and measuring coordinate buses, a switch connected to a control unit connected to a register, to a gateway unit, to a logic unit, a selector connected to with amplitude-phase discriminator, triggers, elements AND and OR f2. A disadvantage of the known device is a high enough reliability. The purpose of the invention is to increase the reliability of the device. The goal is achieved by the fact that the first device, the inputs of which are connected to the control unit and the pulse generator, and the outputs are connected to the reference coordinate device, contains a tablet made in the form of two systems of mutually perpendicular reference and measuring coordinate buses. tire plan 391

one, a single pulse selector connected to an amplitude-phase discriminator connected to a control unit and to a register, a control unit, a register and one input of an OR element, the other input of which is connected to an amplitude-phase discriminator, and the output connected to a block control and with elements And, the inputs of which are connected to the register connected to the control unit, and the puller of coordinates, a trigger is connected connected to the output of the element OR, and the second connected in series

switch, the inputs of which are connected to the measuring coordinate tires

tablet and to the trigger, a bandpass amplifier and a demodulator connected to the pulse generator and to the amplitude-phase discriminator.

In the drawing. The block diagram of the proposed device.

The device contains a tablet 1, reference coordinate tires 2 and measuring coordinate tires 3 of the plate, a coordinate remover with a diamagnetic conductor ring (not shown -), the first switch 5, the control unit 6, the second switch 7, the band-amplifier 8, the demodulator 9, amplitude phase discriminator 10, generator 11 high-frequency pulses, selector 12 single pulses, element OR 13, register AND, elements AND 15, block 16 of conjugation and trigger 17

The device works as follows.

After placing the 4-coordinate puller at the desired point on the tablet 1 and turning on the device from the control unit 6, interrogating pulses begin to arrive at the switch 5, where they modulate the carrier of generator 11, and the received radio pulses are alternately fed to the horizontal reference coils 2. The interrogating pulses also go to the selector 12. Synchronously with the polling pulses, the control unit 6 generates the counting pulses arriving at the second least significant bit of the register C, in which the coordinate values are generated from the task the quantization step equal to the distance between two adjacent buses 2. The interrogation of the reference coordinate buses 2 and the synchronous count of polling pulses on the register 14 continues until the corresponding reference coordinate 4

2 will not excite the measuring coordinate bus 3.

In this case, the puller Q of coordinates with a modulating diamagnetic ring can occupy two positions: Be located symmetrically above a certain busbar, to the right of the tire which is driving it, or between the said busbars. In the first case, after amplification and demodulation, the induced signal is extracted by the amplitude-phase discriminator 10, With its output, the signal arriving at. control block 6, stops the flow of counting pulses to register 14 and lower

It prohibits the passage of polling pulses to the output of the selector 12.

Interrogating pulses from control block 6 continue to flow and the next pulse excites the next

.

Since the diamagnetic conductive ring of the puller 4 is located symmetrically with respect to the excited bus, the measuring coordinate signal

tire 3 is zero. In this case, the polling pulse through the selector 12 enters the register N. With this action, the cycle of direct measurement of the horizontal coordinate ends. For

This impulse from the output of the selector 12 goes to control unit 6 to stop polling reference coordinate buses 2 and to elements 15, and the code from register C is transmitted to interface 16 and to the input of trigger 17 with counting input.

The control unit 6 switches the switch 5 to energize the reference coordinate buses 2 to determine the vertical coordinate of the puller C, and the trigger 17 switches the switch 7. Thus, the measurement coordinate bus 3 is connected to the measurement.

Claims (2)

In the second case, the coordinate is also formed before the appearance of the induced signal at the output of the amplitude-phase discriminator 10, but at the same time, the measuring coordinate 3 is excited by an additional reference coordinate bus 2 to the right of it. As a result, a signal appears at the output of the discriminator 10, which, having entered the AND register, adds to its code a value equivalent to 0.5, which corresponds to the position of the puller between the buses 2. Pass through the OR element 13 to the control unit 6, this signal stops interrogation of the reference coordinate buses 2 and transfers the contents of the register AND through the AND 15 element to the block 16 of the conjugation. In this case, the trigger 17 switches the switch 7 to measure the second coordinate. The second coordinate is measured in the same way. After measuring both coordinates, the control unit 6 outputs a pulse permitting the transfer of the coordinator of the puller k to a computer or other device. At each measurement of both coordinates, unit 1b of the interface compares the values of the current coordinates of the puller A with only one cycle of the coordinates of the previous cycle stored in it. If the results of two adjacent measurement cycles coincide completely, the coordinates obtained in the current cycle are not displayed in the computer or other device, since they repeat the previous result, i.e., correspond to the position of the fixed puller A. If the results of two adjacent measurement cycles differ at least one coordinate, both coordinates of the last cycle are output to a computer or other registering device and they are stored in mate block 16 for the next measurement. Thus, the use of new units and elements connected according to the proposed scheme favorably distinguishes the described device and significantly increases its reliability. The invention A device for reading graphic information containing a plan9 16 lane, made in the form of two systems of mutually perpendicular reference and measuring coordinate buses, the first switch, the inputs of which are connected to the control unit and the pulse generator, and the outputs are connected to the reference coordinate tires of the tablet, single pulse selector connected to the amplitude-phase discriminator connected to the control unit and to the register, to the control unit, to the register and to one input of the OR element, friend whose input is connected to the amplitude-phase discriminator, and the output is connected to the control unit and to the elements, whose inputs are connected to the register connected to the control unit, and a coordinate remover, characterized in that, in order to increase the reliability of the device, it contains a trigger connected to the output; the DO element OR, and in series | connected the second switch, the inputs of which are connected to the measuring coordinate tires of the tablet and to the trigger, a bandpass amplifier and a demodulator connected to the pulse generator and amplitude-phase discriminator. Sources of information taken into account during the examination 1. USSR author's certificate Vf i 06211, cl. G 06 K 11/00, 1973. 2. US Patent No., cl. 178-19, published. 1979 (prototype).