SU1293744A1 - Detector of displacement failures of paper medium - Google Patents

Abstract

- The invention relates to computing and can be used in recording devices. The aim of the invention is to improve the reliability of the device. The device contains a photoelectric sensor 1, amplifier 2, stepping electric actuator 3, indicator 4, reversible counter 5, triggers 6 and 7, element 2I-2I-OR 8, element 2I-2I-Shta-HE 9, element I 10, elements NOT 11 and 12. In case of violation of the mode of movement of the information carrier, for example, it will cease to move or will be broken, the position of the edge perforation will not change. 1 il. with (L 1C O9 4ib 4ib

Description

The invention relates to computing and can be used in recording devices.

The aim of the invention is to increase the reliability of the device.

The drawing shows the functional diagram of the device.

The device contains a photoelectric sensor 1, an amplifier 2, a stepping motor 3, an indicator 4, a reversible counter 5, triggers 6 and 7, an element 2I-2I-OR 8, an element 2I-2I-OR-NOT 9, an element I 10, an element NOT 11 and 12, the first 13 and the second 14 inputs of the device, the third input 15 of the device, the output 16 of the device, the carrier 17 of information.

The drawing shows the transport roller 18.

The device works as follows.

Sensor 1 responds to a section of paper with an edge perforation and produces an electrical signal that is converted by a amplifier 2 into a signal by a voltage level of logic 1. If sensor 1 is located on the edge perforation space of a paper information carrier, a signal with a voltage level logical O. When the transport roller is rotated by an 18-step electric drive 3, two-level signals are formed in the output circuit of the latter. When applying to the third zero input, indicator 4 is reset.

Let the device start at input 14. This will move the paper carrier and the reversible counter will count these pulses. The signal levels at the paired, inputs And element 8 will be opposite, therefore a prohibiting signal will be sent to the element 10. With normal movement of the information carrier 17, the signal at the output of amplifier 2 will change to the opposite one, which will ensure that the signals from one of the input signals coincide. elements 2I of element 8, and at its output a Wits permitting signal (unit level) for element 10, the next pulse from the output of block 3 will translate trigger 6 into the opposite state e and pass through el ment 10, c6jposit counter 5 to zero niei state in connection with the position of the trigger 6 has changed to the opposite one, the inputs on element 8 again will not

match and element 10 will be locked. During normal movement of the information carrier, the reversible counter 5 will be reset each time the position of the edge perforations of the information carrier changes.

If the transfer mode of the information carrier is disturbed, for example, it stops moving or is broken, the position of the edge perforation

will not change, respectively, the signal level at the output of amplifier 2 will not change and the reset counter reset signal will not be generated, it will overflow and

will generate a permitting signal at the input of element 9, the next pulse from the first or second input will pass through element 9 and set trigger 7 to an alarm condition, indicator 4 will turn on, and an alarm will be generated at the device output, which will be generated by external devices stop signal.

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Claims (1)

Invention Formula A paper motion failure detector containing a photoelectric sensor connected to an amplifier, a reversible counter and a stepping electric drive whose inputs are the first and second inputs of the device, and that in order to increase the reliability of the detectives torus, enter into it; indicator, two flip-flops, element C (two elements NOT, element 2I-2I-SHIII and element 2I-2I-OR-NOT, the output of which is connected to the first input of the first trigger, the first and second inputs are connected respectively to the first and second counting inputs of the reversing the first and second inputs of the stepper motor drive, the third and fourth inputs are connected respectively to the first, second outputs of the reversing counter, the second input of the first trigger is the third input of the device, and the output is with the indicator and is the output of the device ektroprivoda connected to the input of the first NOT member with the first input of AND gate having a first input vtoro312937444 the first trigger is connected to the output of the NOT per-element, the third and fourth input element of the NOT, and the second input is connected to the first input amplifier output, with the input of the second and second outputs of the second trigger, element NOT and with the first input element-and output - with the second input element AND, that 2Y-2I-OR, the second input of the element 5, the output of which is connected to the input 2I-2I-OR is connected to the output of the second reset of the reversible counter.