SU1635005A1 - Device for measuring thickness of magnetic tape - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to increase the speed of operation of the device by reducing the duration of the thickness measurement process. The device for measuring the thickness of the magnetic tape contains a rotation sensor 1, one-shot 2 / the signal from the output of which is triggered by control block 5 1 turn in comparison with π turn for the tape of maximum thickness measured by this device in the counter 6. the accumulation in counters 6, 7, 8 of pulses corresponding to the period of n turn, and subtracting from them the pulses corresponding to periods row n + 1 turnover, census state counter 6, after completion of the measurement cycle, a decoder 9, with simultaneous light emission of the result on the display 10. 2 yl YO

Description

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The invention relates to a measurement technique and can be used to measure the thickness of a magnetic tape.

The purpose of the invention is to increase the operating speed of the device by shortening the duration of the thickness measurement process.

FIG. 1 shows a block diagram of the device; FIG. 2 is a block diagram of the control unit.

The device for measuring the thickness of the magnetic tape contains a series-connected rotation sensor 1, a single vibrator 2, a generator 3 and a frequency divider 4, a control unit 5, the first input of which is connected to the input of the one-vibrator 2, and the second - to the output of the generator 3, the first 6, the second 7 and third 8 reversible counters connected in series to the decoder 9, the first input of which is connected to the information output of counter b, and the indicator 10, the first output of control unit 5 connected to the fifth input of the first counter 6. the second to the first inputs counters 6-8, the third with the sixth input of the first counter, the fourth with the second inputs of counters 6-8, fifth with the third inputs of the counters 6-8, and the sixth with the second input of the decoder 9, the output of the 4 frequency divider is connected to the fourth the input of the first counter 6, the transfer output of which is connected to the fourth input of the second counter 7, the transfer output of which is connected to the fourth input of the third counter 8.

The device works as follows.

After the tape recorder is turned on, the receiving cassette assembly begins to rotate, winding the tape on itself. Together with the receiving cassette assembly, the rotation sensor 1 begins to rotate.

After the arrival of the first pulse from the rotation sensor 1, a control signal appears on the first output of the counter Sc1 of block 5 (FIG. 2), triggering the flip-flop Tr1 of block 5 (FIG. 2) at the counting input. After that, the flip-flop Tr1 of the block 5 allows the passage pulses through the second input of the control unit 5 through the circuit I1 of the block 5 (FIG. 2) to the counting input C of the counter Cq2 of the block 5 (FIG. 2), which forms rapid processes.

The first impulse that arrives after the resolution at the second input translates the first output of the counter Cp2 of block 5 to the active state. This leads to the formation of a second pulse control unit at the second output, which clears (reset to 0) reversible counters 6-8 (at input R). and at both inputs of the circuit

From block 5 (figure 2) there are resolving levels

The second pulse arriving at the second input translates the second output of the counter Cp2 of block 5 to the active state. This leads to the end of the reset pulse at the second output of control unit 5 and the formation of a control signal at the first and third outputs of control unit 5. The presence of these signals at the corresponding inputs of the reversible counter 6 permits recording in the parallel code of the number M, which prepares the circuit for operation according to a given algorithm. At the fourth output of the control unit 5, a level O is present which sets the work of the reversible counters 6-8 in the addition mode.

The number M recorded in counter 6 before the number of measurements corresponds to the length of the time interval by which the period (n + 1) -th turn increases compared with the n-th turn for the maximum thickness tape measured by the proposed device.

After the sixth pulse arrives at the second input of the control unit 5, the formation circuit of the fast processes is disconnected, since the pulse R arrives at the input R of the flip-flop Tr1 of the block 5, resetting it to the zero state, after which the circuit is ready to count the number of pulses corresponding to the number of revolutions.

After that, and before the arrival of the second pulse from the rotation sensor 1, the counters 6-8 produce the addition of the number of pulses corresponding to the number of measured turns. After the arrival of the second pulse from the rotation sensor 1, a counter-inhibiting signal is generated at the fifth output of control unit 5.

After the third and fourth pulses from the rotation sensor 1, there are no changes in the operation of the control unit 5.

After the arrival of 5 pulses from the rotation sensor 1, a control signal appears at the fifth output of the counter Sc of block 1 of block 5, which generates a signal at the fourth output of block 5 of control that converts the reversible counters 6-8 into subtraction mode. At the same time, a counting signal is generated from the fifth output of control unit 5.

After the sixth pulse arrives from the rotation sensor 1, the output of control unit 5 is banned, and at the same time the permission to overwrite (on the sixth output of control unit 5) the state of counter 6 into the decoder 9 while

highlighting the result obtained on the indicator 10.

Claims (1)

Invention Formula A device for determining the thickness of a magnetic tape, comprising a rotation sensor, a generator and a frequency divider connected in series, a first counter and an indicator, characterized in that, in order to increase speed, it is equipped with a single vibrator, the input of which is connected to the output of the rotation sensor, the output is connected to the generator input , the control unit, the first input of which is connected to the output of the oscillator, the second input is connected to the output of the generator, the second and third counters and the decoder, the output of which is connected to the input of the indicator the first input is connected to the information output of the first counter, the second input is connected to the sixth output of the control unit, the first output of which is connected to the fifth input of the first counter, the second output is connected to the first inputs of the first, second and third counters, the third output is connected to the sixth input first check, the fourth and fifth outputs are dinane, respectively, with the second and third inputs of the first, second and third counters, the output of the frequency divider is connected to the fourth input of the first counter, the output transfer which is connected to the fourth input of the second counter, the transfer output of which is connected to the fourth input of the third counter. T L. FIG. 2 Editor L.Pcholinsk Compiled by S. Konyuhov Tehred M. Morgental Proofreader V.Girn to