SU475547A1 - Magnetic tape speed oscillation meter - Google Patents

Description

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The invention relates to the field of instrumentation and can be used in magnetic recording equipment for measuring fluctuations in the speed of movement of a magnetic tape in a tape drive mechanism, as well as for detecting and measuring the slipping of a tape.

During the movement of a magnetic tape in a tape-drive mechanism of a magnetic recording apparatus, it is affected by many factors leading to a decrease in the stability of the speed of movement of the tape, which significantly affects the quality of the recording and reproduction of information. Known gauges of fluctuations in the speed of movement of the tape, including the gauge, made with a ferromagnetic gear wheel, the tooth of which interact with the working gap of the magnetic reproduction head. However, the accuracy of measurements using such meters is not high enough, which does not create an objective picture when identifying the reasons for the uneven movement of the tape in the path of the tape mechanism.

The purpose of the invention is to improve the accuracy of measurements of fluctuations in the speed of movement of a magnetic tape.

This is achieved by the fact that the proposed meter is equipped with a discriminator, the various inputs of which are connected to amplifiers of various magnetic heads, and one of the inputs is simultaneously connected to the recording head.

The drawing shows a block diagram of the measuring device of the speed fluctuations of the magnetic tape.

A wheel 2 with ferromagnetic teeth 3 is installed on the lead; the shaft 1 is installed. Each tooth, passing the working gap 4, reproducing the magnetic head 5, leads in it ed. s., resulting in an all-flash, which is a n.pulse. Due to the fact that the magnetic head 5 is connected to the discriminator 7 through the amplifier 6, this pulse arrives at the input 8 of the discriminator. A magnetic recording head 9 is connected to the same input of the discriminator, which in block with the magnetic head 10 of the reproduction is a block of 11 heads. The playback head 10 is also connected via an amplifier 11 to a discriminator, but with a different eio input 12. 12. As a magnetic carrier, it is X1): 5 a magnetic tape 13 is carried.

With the passage of the teeth of the wheel 2 past the working gap of the magnetic head 5, a pulse is reproduced at its output, amplified by amplifier O and recorded by means of the recording head 9 onto a magnetic tape. However, this pulse arrives at the input 8 of the discriminator, the second input of which receives a pulse reproduced by the head 10 II amplified by the amplifier 11. This pulse

turns out to be recorded on a tape as a result of interaction with the working gap of the head 5 of the previous tooth of the wheel 2. And then, in the absence of the slippage effect of the magnetic avent, i. e. to the inputs of the discriminator 7, coincide in time.

In the event of a tape slipping, the impulse from the head 10 lags behind the impulse coming from the head 5, and the slippage itself, i.e., the fluctuation rate of the movement of the magnetic tape, is directly proportional to the distance between the marks created by the pulses recorded on the magnetic tape. In order to indicate the slippage value at the discriminator output, practically any recording instrument can be installed, which can be calibrated in the selected units of measure.

Present Invention

Measuring instrument of the oscillating speed of a magnetic mite, containing a WB; a blowing shaft, a wheel mounted on it with a ferromagnetic teeth mn, interacting with the working gap

of a reproducing magnetic head associated with a reproduction amplifier, and a block of magnetic heads consisting of a recording head and a second reproduction head connected to its amplifier, is distinguished by HI and with the aim of improving the accuracy of measurements, the inputs of which are connected to the specified amplifiers, and one of the inputs is simultaneously a key to 1o, the lock of the record.