SU711630A1 - Device for measuring the slip of record carrier tape relative to tape-driving mechanism driving shaft - Google Patents

Description

The invention refers to the instrument making area and is intended to control the operation of precision tape mechanisms in vibration measurement laboratories and research institutes.

A device for measuring the slippage of a magnetic tape relative to the drive shaft of a tape-forming mechanism, made with a roller rotated by a moving magnetic tape, and with a magnetic disk attached to it, whose end surface is in contact with the working surface of one of the magnetic heads 11, is known. a disk on which, like on a tape-driven magnetic disk, phonograms identical with the same accuracy are recorded in the static position as control pulses with persecuted. When a tape is moving, the reproduced signals are sent to a time pulse discriminator, a differentiation and recording unit, the readings of which are proportional to the magnitude of the slippage of the magnetic tape relative to the lead

go shaft. The main disadvantage of this device is that the error due to tape deformation is not taken into account.

A device for measuring the speed of slippage of a magnetic tape recording medium relative to a drive shaft of a tape mechanism is known.

o a head reproducing a sequence of pulses from a magnetic tape. The magnetic head is connected to a pulse matching meter connected to a loop oscilloscope, to which an additional magnetic head is connected, reproducing a sequence of pulses from a magnetic disk mounted on the master

0 shaft 2.

However, the measurement accuracy is greatly influenced by the deformation of the tape, and the true value is distorted.

5 slippage of the tape relative to the master vap.

The aim of the invention is to improve the accuracy of measuring the slippage of a tape recording medium.

0

relative to the drive shaft of the tape drive mechanism.

This goal is achieved by the fact that, in the device for measuring the slippage of a record carrier relative to the drive shaft of the tape mechanism, there is a first reproducing head that interacts with a tape recording medium, a measurement signal attached to it, a second reproducing head interacting with a control signal the drive shaft, as well as the recorder-, are inserted in series the third reproducible, the head, coupled with the tape carrier, the first the amplitude discriminator, the second input of which is connected with the output of the first reproducing head, the second amplitude discriminator, the second input of which is connected to the output of the second reproducing head and the differentiator, with its output connected to the input of the recorder, while the second and third reproducing heads are installed along one forming a cylindrical surface of the drive shaft. In addition, the heads are made in the form of electrostatic reproducing heads, and the tape carrier is made with a dielectric coating.

Figure 1 shows the proposed device where 1 is a shaft, 2 is a tape, 3 is a signal, 4,5,6 are heads, 7,8 are amplitude discriminators, 9 is a differentiator, 10 is a register-tor. Figure 2-5 shows the recording of waveforms.

The head 6, which interacts with the tape 2 attached to the shaft 1, is located on the same generator with the head 4. The outputs of the heads 4 and 5 are connected to different inputs of the amplitude discriminator 7, the output of the latter and the output of the head b are connected to different inputs of the amplitude discriminator 8, which through differentiator 9 is connected to the recorder 10.

The device works as follows. When the tape is moved 2. By rotating the drive shaft 1, all three heads reproduce the recorded identical waveforms 3, which are recorded in the form of sawtooth pulses (rT) ig.2) on the pre-tensioned electrostatic tape 2, which is in a static position. The slippage of the tape 2 relative to the drive shaft 1 is determined by the difference of the linear speed of the shaft 1 and the tape 2,

However, during movement, the tape 2 is deformed, which entails a change in the law of the dependence of the reproduced voltage on time. This ultimately affects

on the accuracy of measuring the speed of the tape 2.

If there is a deformation of the tape 2, the control signalogram instead of the form (FIG. 3) Takes the form (FIG. 4), i.e. the maximum voltage value remained constant, and the distances between the pulses became different

In order to eliminate the effect of deformation on the measurement of the speed of movement of the tape 2, a head 5 was inserted displaced along a circular arc a distance smaller than the distance between the pulses. ,;

Using signals reproduced by head 4 and 5, we take into account the incidence of deformation of the carrier in the amplitude discriminator 7. Now, by the difference in speeds of the shaft and tape, the amplitude discriminator B and differentiator 9 determine the slip rate, which is recorded by the recorder 10.

Claims (2)

Invention Formula A device for measuring the slippage of a tape recording medium with respect to the drive shaft of a tape mechanism, comprising a first reproducing head interacting with a tape recording medium with a measurement signalogram printed on it, a second reproducing head interacting with a measuring signal of a drive shaft, and a recorder different By the fact that in order to improve the measurement accuracy, one third of the serially connected heads are inserted into the device, the conjugate with a tape recording medium, the first amplitude discriminator, the second input of which is connected to the output of the first reproducing head, the second amplitude discriminator, the second input of which is connected to the output of the second reproducing head, and a differentiator connected by its output to the input of the register, the second third The reproduction heads are mounted along one generatrix of the cylindrical surface of the drive shaft. 2. The device according to claim 1, which is based on the fact that the reproducing heads are made in the form of electrostatic heads, and the exact recording medium is made with a dielectric coating. Sources of information taken into account. 1. Author's certificate of the USSR 369493, c. 11 11/15/46 1971. 2. USSR author's certificate .№ 308359, c. 01 R 3/04, 1970 (prototype).