SU783843A1 - Device for control of magnetic recording apparatus start-stop tape-driving mechanism - Google Patents

Description

The invention relates to the field of instrumentation, in particular to a magnetic recording apparatus (AMZ) operating in start-stop mode.

Known AMZ, in which the tape drive mechanism (LPM) is made on the basis of the receiving and feeding side nodes, each of which has its own electric motor, connected to a number of electromagnetic relays {1].

Such a CVL has a relatively short braking time, but nevertheless, this time is not always sufficient for recording or reproducing all the information that is recorded on or reproduced from magnetic tape (MP).

Closest to the described is a device for controlling the start-stop LPM AMZ, containing a command generator, power amplifier and electric motor [2].

But this device also does not have a sufficiently high 'speed. In addition, if most of the well-known' 25 AMZs do not allow taking measures to increase the density of recorded information, then this device has this ability to some extent. But for all that, the coefficient ^of use of the ML area is also not high enough here.

The aim of the invention is to increase the speed of the mechanism and the utilization of the area of the magnetic tape.

For this, the device is equipped with a reference frequency generator, a frequency divider and a first logic circuit connected to a power amplifier, a speed sensor connected to an electric motor, connected in series by a matching unit, a second power amplifier and a matching stage connected between the outputs of the command generator and the input of the electric motor, as well as a second logic circuit connected between the output of the speed sensor loaded on the second input of the first logic circuit and free in the coincidence block, with the third input of the first, first logic circuits connected to the free output of the shaper commands, and the second output of the frequency divider -. with the second input of the second logic circuit.

The drawing shows a structural diagram of the described device.

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A generator 3 of a reference frequency and a direct command generator 4 and a speed sensor 5 connected to an electric motor b are connected to logic circuit 1 through a frequency divider 2. As well as logic circuit 7. The outputs of circuit 1 are connected through power amplifier 8 to a matching stage 9, and the output of the circuit 7 through the block 10 matches - to the power amplifier 11. -.

From the output 12 of the shaper 4, a direct run command is sent to circuit 1, and then, from the output 13 of the circuit, a signal is supplied to amplifier 8, which provides an increased voltage to the electric motor through cascade 9. The motor rotor accelerates. Simultaneously with the output '14 of circuit 1,' comes', the signal to divider 2, and the output 15 of divider 2 is pulse. ) is established. When the sensor 5 reaches a speed equal to the frequency of the pulse sequence at output 15, a signal arises at output 13 and the supply of increased voltage to the motor stops. ' Simultaneously, the signal is output from the output '14 of circuit 1, which ensures a steady state and the corresponding frequency at the output 15 of divider 2. Then the electric motor receives the rated supply voltage from amplifier 8 through cascade 9 by receiving a signal from the output 16 of circuit 1. C-output 17 of the divider 2, a signal arrives at circuit 7 with a frequency much lower than the frequency of the steady-state mode at output 15. When the Direct Run command is removed, the signal from the output DB also ceases, and stage 9 disconnects amplifier 8 from the electric motor, but connects amplifier 11. from the amplifier due to operation of the coincidence unit supplies a voltage of reverse polarity.

Thus it is possible not only to save the amount of consumed ML but labor "to perform recording and playback of information of reference ^5, which is particularly important when a complex work described device together, e.g., from computer technology.

Claims (2)

The logic 3 is connected to a reference frequency generator and a command generator 4 and a speed sensor 5 connected to an electric motor b, as well as a logic circuit 7 through logic divider 2 and connected to a logic circuit 7. The outputs of circuit 1 are connected via a power amplifier 8 to a matching stage 9 and the output of the circuit 7 via block 10 matches to the power amplifier 11. . . From output 12, driver 4 is sent to Scheme 1, and then from output 13 of the circuit to amplifier 8, a signal is supplied that provides through cascade 9 a feed to the electric motor of a high voltage. There is an acceleration of the rotor of the electric motor. Simultaneously, from output 14 of Scheme 1-, the signal arrives at divider 2, from output 15 of divider 2, an impulse is sent to the sequence with a frequency that is less than the frequency of output 15 in the mode when the operation of the LMB (not shown) When the sensor 5 reaches a speed of frequency equal to an hour pulse sequence at output 15, a signal is output at output 13 and the overvoltage to the motor is stopped. One time signal is also removed from (3 and 14 circuits 1, which provides the steady state and the corresponding frequency at output 15 of divider 2. Then the electric motor obtains the rated power supply voltage from amplifier 8 through cascade 9 due to receiving the signal from output 16 of circuit 1. output 17 of divider 2 to circuit 7 receives a signal with a frequency much lower than the frequency of the steady state at output 15. When you remove the Forward command, the signal from the output. also stops, and cascade 9 disconnects the amplifier 8 from the electric motor, but connects amplifier 11. This from the amplifier, due to the operation of the coincidence unit, it provides the supply of reverse polarity. Thus, it is possible to save not only the amount of ML consumed, but also to labor on recording and reproducing information, which is especially important for the integrated operation of the described device together, for example, Computing technique. Formula of the invention. A device for controlling the start-stop tape-drive mechanism of a magnetic recording apparatus, retaining a command driver, a power amplifier and an electric motor that is designed so that, in order to increase the speed of the mechanism and the coefficient of use of the area of the magnetic tape, it is equipped with a successively. connected by a reference frequency generator, a frequency divider and a first logic circuit connected to the specified power amplifier, a speed sensor connected to an electric motor, sequentially connected by a matching unit, a second power amplifier and a matching stage connected between the driver commands and the motor input, and also by the second logic circuit, the inclusive mode of the speed sensor output loaded on the second input of the first logic circuit, and the free input of the coincidence unit, wherein the third input of the first logic circuit is associated with the free output of the command driver, and the second output of the frequency divider is connected with the second input of the second logic circuit. Sources of information taken into account during the examination 1. USSR author's certificate No. 347793, cl. Q 11 B 15/18, 1970. 2. USSR author's certificate №473458, cl. Q 11 V 15/18, 1972 (prototype).