SU664064A1 - Device for measuring tension variations of moving tape - Google Patents

Description

(54) DEVICE FOR MEASURING VIBRATIONS OF TENSION OF A MOVING MAGNETIC TAPE

The invention relates to a measurement technique, in particular, to devices for measuring the tension fluctuations of a moving magnetic field.

A device for measuring the tension fluctuations of a moving magnetic tape, comprising a magnetic head associated with a magnetic tape and connected to a signal shaper proportional to tension 1. The known device converts the tension fluctuations of a moving magnetic tape into recorder readings. However, such a device requires the recording of a control signal on a moving magnetic tape.

It is also known a device for measuring the tension fluctuations of a moving magnetic tape, containing photo sensors mounted along the edges of the moving magnetic tape against light sources and connected to the inputs of the subtraction unit, and a multiplying unit for the elastic modulus and thickness of the magnetic tape connected to the input of recorder 2. This device Provides a measurement of the tension fluctuations of a moving magnetic tape without recording a control signal on it.

The drawback of the device is a significant measurement error caused by the uneven movement speed of the magnetic tape.

The purpose of the invention is to reduce the error of the result of measuring the tension fluctuations of a moving magnetic tape.

This is achieved by introducing an integrator connected to the output of the subtracting unit and an additional subtracting unit connected to the input of the multiplying unit for the elastic modulus and the thickness of the magnetic tape into a device for measuring the tension fluctuations of the moving magnetic tape. In this case, the inputs of the additional subtraction unit are connected to one of the photosensors and to the integrator.

The drawing is a schematic of the proposed device for measuring vibrations of the tension of a moving magnetic tape, option.

Claims (2)

The proposed device contains photosensors 1 mounted along the edges of the moving magnetic tape 2 against the light sources 3. Photo sensors 1 are connected to the inputs of subtraction unit 4, the output of which is connected to the input of integrator 5. The proposed yctpoHCTBO also contains additional subtracting unit 6 whose output is connected to the input. block 7 multiplied by the elastic modulus and the thickness of the magnetic tape, and inputs with one of the photosensors 1 and with the integrator 5. The output of the block 7 multiplied by the elastic modulus and the thickness of the magnetic tape is connected to the register input trattoria 8. In the device 1 the photosensors signals proportional to variations in the moving edges of the magnetic tape 2, are subtracted. After that, the result of the subtraction is integrated, and the signal of one of the photosensors 1 is subtracted from the integration result. Then multiplied by the elastic modulus and the thickness of the magnetic tape and the result of this multiplication is recorded. The proposed device substantially reduces the uncertainty of the result of measuring the tension fluctuations of a moving magnetic leite. In addition, the use and.% Gain provides a relatively simple construction of a device for measuring the tension fluctuations of a moving magnetic tape. Claims An apparatus for measuring tension fluctuations of a moving magnetic tape, comprising photo sensors mounted along the edges of the moving magnetic tape against light sources and connected to the inputs of the subtraction unit, and a multiplying unit for the elastic modulus and thickness of the magnetic tape connected to the recorder input, differing in that, in order to reduce the error of the measurement result, an integrator connected to the output of the subtraction unit and an additional reading block connected to the input of the block are entered into it and multiplying by the elastic modulus and thickness of the magnetic tape, wherein the complementary box vychitalk inputs connected to one of the photosensors and integrator. Sources of information taken into account in the examination 1. The authors of the USSR LL 352310, cl. G 11 B 15/43, 1970. 2. USSR Author's Certificate No. 315208, cl. G 11 B 27/34, 1970.