SU1339650A1 - Device for checking cassette with magnetic tape - Google Patents

Abstract

This invention relates to the accumulation of information. The purpose of the invention is to improve the accuracy of control of the cassette with magn. taped. Through the switches 26 and 27 from the converters 1 and 2, the current - voltage to the comparison blocks 17 and 18, respectively, receives a voltage proportional to the real moment of resistance to rotation of the core with the maximum magnet roll. tapes, and a voltage proportional to the real moment of resistance to rotation of the core with a minimum roll of magn. tapes. If the real moment of resistance to rotation of the core with the maximum (minimum) magnet roll. the tape does not exceed the allowable moment of resistance, characterized by the voltage of the source 19 of the reference voltage, then the comparison block 17 (18) generates a signal displayed by the indicator light 11. The return magn. The tapes are reset to the initial state by vibrating the piezoceramic plates 14 and 16, excited by the high-frequency voltage supplied through the switches 8 and 10, opened by the pulses of the multivibrator 23, excited by the pulses of the generator 5 through the delay element 23. 1 il. Q (L with so with 05 sd o

Description

The invention relates to the accumulation of information, namely, devices for monitoring a tape cassette.

OBJECTIVE of the invention is to improve the accuracy of control of a tape cassette.

The drawing shows a device for controlling a tape cassette.

The device contains the first 1 and second 2 current-voltage converters, connected to the control signal feed circuit 6 starts a pulse generator 5, which forms a sequence of pulses fed to the first multivibrator 24 and to the first 21, second 22 and third 23 delay elements. The first multivibrator 24 produces pulses whose duration is less than half the period of the pulse sequence of the pulse generator 5. The pulses of the first multivibrator 24

inputs with outputs respectively open the first 7 and third 9 switch 3 and second 4 power supply units, pulse generator 5 connected to the output of the control signal generator 6, first to fourth switches 7-10, light indicator 11 and rotation elements 12 magnetic tape cartridge cores. The elements 12 of rotation of the cores of the cassette with a magnetic tape are made in the form of the first 13, second 14, third 15 and fourth 16 piezoceramic plates mounted with the possibility of acting on the rotors of the cores.

The device also contains the first 17 and second 18 comparison blocks, connected by outputs to the first and second inputs of the light indicator 11 and connected by first inputs to the outputs of the first 19 and second 20 sources of the reference Voltage, respectively, from first to third delay elements 21-23, connected by inputs to the output of the pulse generator 5, the first 24 and second 25 multivibrators connected by the outputs respectively to the first inputs of the first 7 and third 9 switches and to the first inputs of the second 8 and fourth 10 switches, fifth 26 and sixth 27 switches connected by the first inputs to the first outputs of the first 1 and second 2, respectively, of the current-voltage converter connected by the second outputs respectively to the second inputs of the first 7 and second 8 switches and to the second inputs of the third 9 and fourth 10 switches, and third 28 and fourth 20 multivibrators. The outputs of the first 21 and second 22 delay elements are connected via the third 28 and fourth 29

25

tori through which the first 13 and third 15 piezoceramic plates pass high frequency voltages corresponding to the high frequency signals of the first 3 and second 5 power supply units. At the same time, due to the high-frequency vibration of the first 13 and third 15 piezoceramic plates, acting on the rotors of the cores, the magnetic tape moves in the forward direction in the cassette 12 from the magnetic

20 tapes over time intervals equal to the pulse duration of the pulse generator 5.

Each pulse of the pulse generator 5 is delayed in the first 21 and second 22 delay elements per time interval, exceeding the transient time. The delayed pulses arrive at the first 24 and second 25 multivibrators, producing pulses, which open the first 17 and second 18, respectively.

2Q switches. Through the first 26 and second 27 switches, from the first 1 and second 2 converters, the current to the first 17 and second 18 comparison units receives, respectively, a voltage proportional to the actual resistance of the core with the maximum roll of magnetic tape, and the voltage proportional to the real moment of resistance to rotation of the core with a minimum roll of magnetic tape. If the real moment of resistance to rotation of the heart of a peak with a maximum roll of magnetic tape does not exceed the permissible resistance value, characterized by the voltage of the first source 19 of the reference voltage, then the first block 17 of the comparison of the multivibrators with the second inputs corresponds to the signal displayed by the light

There are correspondingly 26 and sixth 27 switches connected by outputs to the second inputs of the first 17 and second 19 comparison blocks respectively. The output of the pulse generator 5 is connected to the input of the first multi-indicator 11. If the real moment of resistance to rotation of the core with the minimum roll of magnetic tape does not exceed the permissible moment of resistance, characterized by the voltage of the second oscillator 24, and the output of the third element 23 of the reference voltage source 20, the high-voltage is connected to the input of the second multivibrator 25. At the same time, the first to fourth piezoceramic plates 13-16 are connected to the outputs of the first to fourth switches 7-10, respectively.

The control of the cassette with magnetic mite through the proposed device is as follows.

The comparative block 18 generates a signal displayed by the light indicator 11. The return of the magnetic tape to the initial state is ensured by the vibration of the second 14 and fourth 16 piezochermics plates excited by high-frequency voltages supplied through the second 8 and fourth 10 co.mmt. - tori, opened by pulses of the second multiformer 6 of the control signal, start the pulse generator 5, which forms a sequence of pulses, arriving at the first multivibrator 24 and at the first 21, second 22 and third 23 elements you delay. The first multivibrator 24 produces pulses whose duration is less than half the period of the pulse sequence of the pulse generator 5. The pulses of the first multivibrator 24

open the first 7 and third 9 switches open the first 7 and third 9 switches 5

tori through which the first 13 and third 15 piezoceramic plates pass high frequency voltages corresponding to the high frequency signals of the first 3 and second 4 power supply units. At the same time, due to the high-frequency vibration of the first 13 and third 15 piezoceramic plates, acting on the rotors of the cores, the magnetic tape moves in the forward direction in the cassette 12 from the magnetic

0 tape for time intervals equal to the pulse duration of the pulse generator 5.

Each pulse of the pulse generator 5 is delayed in the first 21 and second 22 delay elements per time interval, exceeding the transient time. The delayed pulses arrive at the first 24 and second 25 multivibrators, producing pulses, which open the first 17 and second 18, respectively.

Q switches. Through the first 26 and second 27 switches, from the first 1 and second 2 converters, the current to the first 17 and second 18 comparison units receives, respectively, a voltage proportional to the actual resistance of the core with the maximum roll of magnetic tape, and the voltage proportional to the real moment of resistance to rotation of the core with a minimum roll of magnetic tape. If the real moment of resistance to rotation of the heart with a maximum roll of magnetic tape does not exceed the permissible resistance value, characterized by the voltage of the first source 19 of the reference voltage, then the first comparison block 17 produces a signal displayed by the light

indicator 11. If the real moment of resistance to rotation of the core with a minimum roll of magnetic tape does not exceed the permissible moment of resistance, characterized by the voltage of the second source 20 of the reference voltage, then the second source 20 of the reference voltage, the second block 18 of the comparison produces a signal displayed by the indicator light 11 The return of the magnetic tape to its initial state is ensured by the vibration of the second 14 and fourth 16 piezo-ceramic plates, excited by high-frequency voltages, by upayuschimi 8 through the second and fourth ko.mmuta- tori 10, open the second multivibrator 25 pulses excited by the pulses of the pulse generator 5 through the third delay element 23.

Claims (1)

Invention Formula A device for controlling a magnetic tape cassette containing a pulse generator connected by an input to the output of a control signal generator, first and second current-voltage converters connected by inputs to the outputs of the first and second power supply units, the first, second, third and fourth switches, the first and a second reference voltage source, a light indicator and the elements of rotation of the cores of a magnetic tape cartridge, characterized in that, in order to increase the accuracy of control of the magnetic tape cartridge First, the first and second comparison blocks, connected by the outputs to the first and second inputs of the light indicator and connected by the first inputs to the outputs of the first and second sources of the reference voltage, respectively, the first, second and third delay elements connected by inputs to the output of the pulse generator, are entered into it, per Compiled by Y.-K. Rosencrantz Tehred I. VeresKorrektor G. Reshetnik Circulation 589 Subscription VNIIPI of the USSR State Committee on Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk iab., 4/5 Production and Printing Enterprise, Uzhgorod, ul. Project, 4 second and second multivibrators connected by outputs respectively to the first inputs of the first and third switches and to the first inputs of the second and fourth switches, fifth and pinhole switches connected by the first inputs to the first outputs of the first and second current-voltage converters respectively, connected by the second outputs with the second inputs of the first and second switches and the second inputs of the third and fourth switches, and the third and fourth multivibrators, and the rotation elements of the cores of the magnetic tape cassette are made in the form of four piezoceramic plates connected to the outputs of the switches from the first to the fourth, and the outputs of the first and second delay elements are connected via the third and fourth multivibrators with the second inputs, respectively, of the fifth and the sixth switches connected by the outputs to the second inputs of the first and second comparison units, respectively, and the inputs of the first and second multivibrators are connected to the outputs of the pulse generator and the third delay element, respectively.