SU1628083A1 - Device for magnetic recorder control - Google Patents

Abstract

The invention relates to the recording of information using magnetic recording, can be used in storage of information on a movable magnetic medium and allows to exclude the loss of the recorded information at the moment of transition from the main magnetic storage device (MS). With the beginning of the movement of the magnetic carrier, the sensor 4 of the rotation frequency of the main MZU 1 begins to generate pulses, the frequency of which is proportional to the speed of the maximum feed and coil of the main MZU 1 and which, i.e. the one-shot 8, the inverter and the element AND 10. When the pulse duration produced by the sensor 4 rotational speed becomes less than the pulse duration coming from the single-oscillator 8, the pulse output coming from the element 10 And 10 The 3rd is on the 3rd control, which in turn forms the command to turn on the backup MZU 2.1 CZ. f-ly, I ill. with e (L

Description

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The invention relates to the recording of information using magnetic recording and can be used in storage of information on a movable magnetic carrier.

The purpose of the invention is to eliminate the loss of recorded information at the time of the transition from the main MZU to the backup.

The drawing shows a functional diagram of the device for controlling magnetic recording apparatus.

The device contains the main and backup magnetic storage devices (MZU) 1 and 2, the control unit 3, the first output of which is connected to the input of the main MZU 1, and the second - to the input of the backup MZU 2, the first sensor A of the rotation frequency (supply coil of the main MZU 1) and a second rotational speed sensor 5 (supply coil of the backup MZU 2) whose outputs are connected to the first and second inputs of the control unit 3, the third output of which is connected to the input of the frequency comparator 6 whose output is connected to the third input of the control unit 3. Frequency comparator 6 contains a differentiating circuit 7, a single vibrator 8, an inverter 9 and an AND element 10, the inputs of the differentiating circuit 8 and an inverter 9 are interconnected and is the input of a frequency comparator 6, the output of which is an element Element 10, the first input which is connected through the one-shot 8 with the output of the differentiating circuit 8, and the second - with the output of the inverter 9.

A device for controlling magnetic recording apparatus operates as follows.

When recording information on a magnetic carrier, its speed relative to the recording heads is a value within certain limits constant, which causes a change in the frequency of rotation of the supply coil in the recording process. The value of the rotation frequency is minimal at the beginning of the recording and reaches its maximum at the moment of complete unwinding of the magnetic carrier. Therefore, there is a relationship between the residual amount of magnetic carrier of the supply coil, its frequency of rotation, and the trace body, and the pulse frequency generated by the sensors of the proposed device. Using this

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Dependencies allows the device to turn on the backup MZU in terms of the movement of the maximum, pre-set magnetic media consumption.

The operation of the device starts issuing a command in the form of a voltage pulse to turn on the main MZU 1 from the first output of the control unit 3. When the magnetic carrier starts moving, the rotational speed sensor A of the main MZU 1 begins to generate pulses whose frequency is equal to the rotation frequency (or a multiple of it depending on from the design of the sensor) feed coil main MZU. The sensor 4 generates pulses by discharging electrical fuse, of which its electrodes and rotating part are part, the input of the first differentiating circuit 7 and the input of the inverter 9. From the output of the differentiating circuit 7, the pulses arrive at the input of the one-oscillator 8, which the pulse corresponding to the leading edge of the pulse arriving from sensor A produces its own pulse, the duration of which is decisive for the moment when the backup MZU 2 is turned on. The first input of the AND 10 element receives pulses from the output of the one-oscillator 8, to its second input is received by pulses from the output of inverter 9. Element I 10 compares the time interval (constant) determined by the duration of the pulse generated by the one-shot 8, with a time interval determined by the time-varying pulse frequency coming from sensor A. By increasing the flow rate of the magnetic carrier, the rotational frequency of the supply coil increases and the period of the pulses generated by sensor A decreases. Therefore, at the beginning of operation, when the consumption of the magnetic carrier is small, the period of traces neither the pulses generated by sensor A are longer than the pulse generated by the single vibrator 8, therefore, element 10 is closed, however, over time, the pulse period from sensor A decreases and there comes a time when the pulse duration from the single vibrator 8 becomes longer, element And 10 opens and the impulse from its output goes to the third input of the control unit 3, which, upon its appearance, will issue a command from its second output to turn on the backup MZU 2. Next, the MZU 1 and 2 will continue to work together until the end of the magnet carrier on the main ROM 1, after which the OZU 2 will continue to work independently (as the main one).

Claims (2)

1. A device for controlling magnetic recording apparatuses, comprising main and backup magnetic storage devices, the control inputs of which are connected to the first and second outputs of the control unit, characterized in that, in order to prevent loss of the recorded information when switching from the main magnetic storage device to the backup, The first and second rotational speed sensors of the feeding coils and frequency comparators are inserted into it. five A torus, the outputs of the first and second rotation speed sensors of the feeding coils are connected respectively to the first and second inputs of the control unit, the third input of which is connected to the output of the frequency comparator, and the third output of the control unit to the input of the frequency comparator. 2. The device according to claim 1, wherein the frequency comparator contains a differentiating circuit, a one-shot, an inverter and an element, And the inputs of the differentiating circuit and the inverter are interconnected and are the input of the frequency comparator, the output of the differentiating circuit is connected with the input of the one-vibrator, the output of which is connected to the first input of the element And, the second input of which is connected to the output of the inverter, and the output of the element And is the output of the frequency comparator.