SU864333A1 - Method of measuring non-uniformity of carrier tape speed - Google Patents

Description

(54) METHOD OF MEASUREMENT OF THE UNEVENMALITY OF THE VELOCITY OF THE MOTION OF THE TAPE MEDIA

I

The invention relates to a measurement technique, in particular, to methods for measuring the motion parameters of electrostatic recording media and can be used to control the quality of the functioning of precision assemblies, the functioning of media sweep nodes in research institutes, vibration measurement laboratories and directly in production.

There is a known method of ilearning of the uneven speed of movement of a tape carrier, which consists in recording a pulsed control signal on a carrier, playing it back, reading it out of, j the reproduced reference signal, according to the results of which it is judged that the speed is unequal. However, in known devices, the measurement accuracy is influenced by the Ho-jg defogment in the area of the reproduction head.

The closest is a method of measuring the uneven speed of movement of the tape carrier, when

Control constant-frequency impulse signals for one track of a moving tape carrier are reproduced, these signals are reproduced, and the duration of the reproduced signals is measured by a pulse-counting method.

The known method is characterized by n & -. sufficient accuracy of measurement of carrier speed fluctuations during recording.

The purpose of the invention is to improve the accuracy of intent.

Claims (2)

This goal is achieved by using a known method for measuring irregularity of the speed of a tape carrier, which records control pulsed signals of a constant frequency on one track of a moving tape carrier, measures these signals and measures the duration of the reproduced signals, control and pulse signals using a pulse-counting method. signals of a constant aastota, recording in spite of potential line segments on a moving carrier by a fixed beam of an electrostatic recording head, The same control signals are produced by scanning the beam of a cathode ray tube with a metal fiber screen across the width of the tape carrier, count the number of pulses generated in ms by the beam crossing each segment of the control signal trace, and the irregularity of the speed of movement of the bodies is judged by the change in the number of these pulses. The drawing shows a diagram of the device for reproducing the recorded waveform and determining the unevenness of the speed of movement of the carrier on the recording device vHe shown. A metal tube with a metal-LIKE screen I is installed with a certain gap perpendicular to the rigidly fixed counter electrode 2, along which moving carrier 3 is slid by the recorded signalgram 4. The method for measuring the non-uniformity of the speed of movement of the tape carrier is carried out in the following way. A control signal pattern is recorded on a dielectric medium in the form of potential lines of equal length from the cuttings with the help of a fixedly mounted recording head. The lengths of the line segments are actually modulated by the speed of the carrier MOVIE. The recorded waveform is then played on the device. The carrier 3. is propelled by an electrically driven control tape mechanism, in which the carrier displacement speed is stabilized. With etx, carrier 3 is pulled to the same extent as with. 9, the motion signal is reproduced by an electron beam by tube I. As a result of supplying a sawtooth current from the generator output to the deflection system of the generator, the electron beam opened by the signal from the output of the high voltage source 6 scans across the width of the carrier 3. When the beam hits the metal fiber electrodes of the tube screen, their potential reaches the voltage of the breakdown, as a result of which the charge is transferred to the carrier and, as a current, the carrier 3 flows through the counter-electrode 2 and the resistor 7 - the housing. On the resistor 7, in the moment of intersection by the beam of potential lines of the waveform 4, short pulses are generated with an amplitude which is determined by the potential difference between the tube electrodes and the portions of the waveform 4. When this pulse is present, a short pulse is generated that is fed to the counter input pulses 9. It calculates the number of intersections of the line segments by a ray of a tube. The scanning step of the beam 01 is disconnected by the scanning period of the beam with a constant speed of movement of the carrier 3. When the length of an individual segment of a loop ends, a signal is generated on the resistor 7, on the falling edge of which the amplifier 1 forms the pulse 8, and the counter is set to with in the initial position. The abscissa axis of the recorder is mixed by an amount corresponding to the number of intersections of the line by the beam, and the specified length, i.e. length obtained when recording the line with an electrostatic gchelkovka when the carrier is moving at a nominal speed. The proposed method is quite simple, does not require complex hardware implementation, has reliability. The method of measuring the uneven speed of movement of a tape carrier, which records control pulsed signals of a constant frequency on one track of a moving tape carrier, reproduces these signals and measures the duration of reproduced signals by a pulse-counting method, in order to improve the accuracy measurements, control pulsed signals of a constant frequency are recorded in the form of potential line segments on a moving carrier by a fixed beam electrostatic After recording the control signals by scanning the beam of a cathode ray tube with a metal fiber screen across the width of the tape carrier, count the number of impulses formed during the moments of intersection by the beam of each line of the control signalograms, and the uneven speed of the carrier is judged by the number of these signals. pulses. Sources of information taken into account the review of expertise 1. USSR author's certificate number 532050, cl. G O1 A 3/54, O7.08.75. 2. USSR author's certificate number 564655, cl. and It B 27/10, O2.O3.7v (prototype).