SU1730647A1 - Printing device - Google Patents

Abstract

The invention is intended for use in computing, in particular in an apparatus for automatically documenting data. The aim of the invention is to increase the reliability of the device by providing continuous monitoring of the operation of the clock generator. The device contains a printing unit 1, an electric motor 2, a clock generator 3, a control unit 4, a first driver 5, a differentiating element 6, a second driver 7, a sawtooth voltage generator 8, and a threshold element 9. The generator 10 of the print start and end, rows and a group of sync pulse sensors 11. The control unit 4 contains the test control unit 12, the comparators group 13, the encoder 14, the start-stop node 15, the amplifiers group 16, the trigger 17. The first driver 5 contains the trigger group 18, NOT element 19 and AND-NO element 20. The locking device allows continuously monitor faults and malfunctions of the generator clock. 2 Il. SO with

Description

The invention is intended for use in computing, in particular in an apparatus for automatically documenting data, and is an improvement over the basic invention of a. No. 559254.

The aim of the invention is to increase the reliability of the device by providing continuous monitoring of the operation of the clock generator.

Figure 1 presents the block diagram of the printing device; figure 2 - timing diagram of the device.

The printing device contains a printing unit 1, an electric motor 2, a clock generator 3, a control unit 4, a first driver 5, a differentiating element 6, a second driver 7,

sawtooth generator 8 and threshold element 9.

The generator of clock pulses 3 contains the sensor 10 of the beginning and end of the printing line and the group of sensors of clock pulses 11.

The control unit 4 comprises a test control unit 12, a comparators group 13, an encoder 14, a start-stop unit 15, a group of amplifiers 16, a trigger 17.

The first driver 5 contains a group of triggers 18, the element is NOT 19 and the element is NOT-20.

The device works as follows.

When the device is working properly, the motor 2 rotates at a constant speed and at the outputs of the sensors 10 and 11 at equal intervals of time, V4 CO O O 4 vj

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pulses that go to the strobe trigger 17 and to the control unit 4 of the control unit 4 to generate, using comparators 13, a code of print pulses, which are then output through amplifiers 16 to the printing unit 1 and to the test control unit 12. At the same time, the pulses from the sensors 11 and the trigger 17 arrive at the inputs of the first driver 5, in which periodically the trigger 18 is set to one state and reset along the chain to the zero state on the falling edge of the last pulse.

In Fig. 2, plot 21 shows pulses of code sensors (K) and beginning (H) lines; plot 22 - the gate at the exit of the trigger 20; plot 23 - pulses at the output of sensors 11 (D1, D2, ..., Dm); Plot 24 — Triggers condition 18 (Ti, T2TN); plot 25- pulses on

the output of the differentiating element 6; plot 26 - pulses at the output of the second shaper 7; plot 27 is the voltage at the output of the generator 8 and plot 28 is the signal at the output of the threshold element 9.

The signals of, for example, the second trigger 18 (T2) of the group are differentiated by element 6, which removes the constant component in them. Positive peak signals 25 are converted by the second driver 7 to pulses 26, which control the operation of generator 8. In the intervals between pulses 26, sawtooth signals 27 appear at the output of generator 8, the amplitude of which, during normal operation of the device, does not have time to reach the response level of threshold element 9 and there is no fault signal at its output.

The output of the first driver 5 can serve as the output of any of its triggers 18.

If a malfunction occurs in one of the sensors 11 at the corresponding (second) input of the first shaper 5, the interval between the pulses 23 (D1) increases or the pulses 29 completely disappear. From this moment on, the second trigger 18 of the group remains in the zero state — plot 24 (T2) and prohibits the sequential setting of the remaining triggers 18 of the group to one state. The pulses on the plots 25 and 26 disappear and the sawtooth voltage of the generator 8 reaches the trigger level of the threshold element 9, at the output of which a fault signal 28 appears.

A similar process occurs when the sensors 10, the trigger 17, the electric motor 2, or the node 15 controlling it fails. It does not matter what

voltage level (single or zero) comes from a faulty sensor.

At the time of the program start or stop of the device for the time of acceleration or

engine braking 2, the start-stop node 15 generates a prohibitive signal to the sawtooth generator 8 and blocks the generation of a false alarm signal. If a malfunction occurs

the first driver 5, the differentiating element 7 or the generator 8 also generates a fault signal.

Claims (2)

1. A printing device containing a printing unit, an electric motor, a clock generator, a control unit, the printing unit and a pulse generator are mechanically connected to the electric motor, the control input of which is connected to the start output of the control unit, the beginning and end inputs of which are connected to the corresponding outputs 5 sync pulse generator, the control inputs of the control unit are the control inputs of the device, characterized in that, in order to increase the reliability of the device, 0, the first and second formers, a differentiating element, a sawtooth generator and a threshold element, the output of which is the output of the device malfunction and the input is connected 5 with the output of the sawtooth voltage generator, whose blocking input is connected to the corresponding output of the control unit, and the reset input is connected to the output of the second driver, whose input 0 is connected to the output of the differentiating element, the input of which is connected to the output of the first transformer, the first input of which is connected to the gate output of the control unit, and the remaining inputs are connected to the corresponding outputs of the clock generator and the corresponding inputs of the control unit whose information inputs are informational inputs devices. 02. The device according to claim 1, in that the first driver contains a group of triggers, elements NOT and NAND, and the direct output of the i-ro trigger of the group is connected to the reset input (i + 1) -ro trigger Group 5 and the output of one of the group triggers are also connected to the output of the first driver, the input of the i-ro trigger of the group is connected to the ith input of the first driver, while the installation input of the last trigger of the group is connected Yl./