SU744659A1 - Graphic information readout device - Google Patents

Description

(54) DEVICE FOR READING GRAPHIC The invention relates to automation and computer technology, in particular to devices for reading graphic information. A device for reading graphic information containing a working tablet with an orthocanal system of single conductive buses connected to a switchboard, a coordinate remover connected via a switch to a control unit, and through an amplifier and amplitude-phase discriminator to a single pulse separation circuit is known. , a control unit, a coordinate register, an OR circuit, a block of code transmission gates, and a circuit for comparing and outputting coordinates 1. The closest technical solution to the present invention is a device containing a plate, implemented in the form of a system of two mutually orthogonal coordinate buses, successively connected to the coordinate remover, the first amplification unit, amplitude-phase discriminator, single pulse extraction unit, coordinate meter and interface block, connected to amplitude-phase discriminator control unit, inputs of which are INFORMATION I dinens with an amplitude-phase discriminator and with a burr connected to a coordinate remover, and the outputs are connected with a coordinate counter, with a single pulse extraction unit and with a switch connected to the coordinate counter, the second gain unit and element AND 2. The disadvantage of these devices is their low reliability. The purpose of the invention is to increase the reliability of the device. The goal is achieved by the fact that it contains a mating unit connected to the switchboard, coordinate ujHeiMH of the plate and the second gain unit, information recording unit, the inputs of which are connected to the coordinate counter and the amplitude-phase discriminator, and the output is connected to the AND element connected .to control units and con. nor, and an I-NB element connected with control units, information recording and with a second gain unit. The drawing shows the block diagram of the device. The device includes a tablet 1, made in the form of a system of two mutually mutually orthogonal coordinate busbars 2, a conjugation unit 3 made in the form of a transformer, a switch 4, a 5 coordinate remover, a key b, a control box 7, a first gain unit .8 ;, amplitude-phase discriminator 9, counter 10 coordinates, block 11, single or single pulses, block 12, block 13 registering information, for example, faults, second block 14 of amplification, element 15 AND-H and element 16 I.

The device works as follows.

When the 5-coordinate puller points are installed at the selected point on the tablet 1, the key 6 closes. From the control unit 7, the input signal of the switch X comes to the input of the switch 4. The polling pulses from the control unit 7 are fed to the polling input of the switch 4 and the passage through the block 3, consistently arrive at opro. each coordinate bus 2 of the tablet 1. Switch 4 provides alternate connection of the tires for each of its coordinates in accordance with the code received from the output of the higher bits of the counter 10 coordinates. After polling one co-ordinate bus into the counter: IR 10 coordinates, the value of the interrogated coordinate is recorded, which from the output of the counter 10 coordinates arrives at the input of switch 4. Thus, the connection of the next coordinate bus is provided. The 10 coordinates are recorded into the counter with the measured coordinates taken at a discreteness equal to the quantization step of the worktable 1 with the 2-point buses 2. .J-., - ...

The polling of tires along one coordinate axis continues until the signal from the bus to the right of it (right pulse) is induced in the puller 5 coordinates.

The induced signal, having passed through block 8 and amplitude-phase discriminator 9, goes to blocks 11 and 13. At the same time as the induced signals, a sampling pulse arrives from the control block 7 at the input of block 11. After polling the tire, the next pulse is recorded in the 10-position counter.

After measuring both coordinates, the control unit 7 outputs, via element 16, and to unit 12, a signal for transmitting information to the digital computer. This signal passes through element 16 I and is fed to the input of block 12, if from block 13 to the second input of element 16 I received a permission signal. Otherwise, the signal from control block 7 does not pass: through element 16 I. The inhibit signal to issue information to the digital computer is output by block 13 in case a fault is detected

in the zone of sensitivity of the puller 5 coordinates.

When interrogating the busbars 2, the current interrogation pulses pass through the primary winding 3 of the transformer. Impulses induced in the secondary winding of the transformer 3 pass through block 14 to the input element 15 AND-NOT. At the same time, the second input of this circuit receives pulses from control unit 7. In the presence of signals at the two inputs of the element 15 NAND, its output will be the level of logical zero, which indicates the health of the polling circuits. In the event of a break of one or several coordinate buses 2, the failure of one or more of the polling channels of the switch 4 in the secondary winding of the transformer 3 and at the input of the element 15 AND-NO, there are no induced pulses. The polling pulse from control unit 7 passes through element 15 AND-NOT and enters input of block 13. If block 13 was previously entered, then with the arrival of a pulse from element 15 AND-NOT unit 13 generates a inhibitory signal that goes to the input of element 16 I. Simultaneously with the prohibition signal being issued in accordance with the input from the output of the counter of 10 coordinates to block 13, the number of the faulty bus or interrogation channel of the switch 4 is indicated. In case block 13 has not been entered, the inhibit signal to the input of element 16 AND not issued, but wasp There is only an indication of a faulty bus or polling channel of switch 4.

The introduction of new units and new constructive links allows us to significantly increase the reliability of the device.

Claims (2)

1. USSR author's certificate number 406211, class, G 06 K 11/00, 1973. 2. US patent number 3705956, cl. 178-18, published. 1972 (prototype)