SU555433A1

SU555433A1 - Device for measuring the tension of a magnetic tape

Info

Publication number: SU555433A1
Application number: SU2314029A
Authority: SU
Inventors: Аполинарас Казио Куртинайтис; Рамунас Ромуальдо Балькявичус; Казимерас Миколо Рагульскис
Original assignee: Каунасский Политехнический Институт Им. Антанаса Снечкуса
Priority date: 1976-01-04
Filing date: 1976-01-04
Publication date: 1977-04-25

Description

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Изобретение относитс к приборострое нию , а именно к устройству дл измерени нат жени магнитной ленты, перемещающейс непосредственно в тракте лентопрот жного механизма аппарата магнитной записи.. Это устройство может быть использовано также и автономно.The invention relates to instrumentation, in particular, to a device for measuring the tension of a magnetic tape, moving directly in the path of a magnetic tape recorder. This device can also be used autonomously.

Известны устройства, предназначенные дл измерени уровн нат жени движущейс магнитной ленты, выполненные на основе преобразователей механических колебани в электрические. К таким устройствам относитс измеритель нат жени магнитной ленты, основанный на использовании стерЖ н , наход щегос в непосредственном контакте с магнитной лентой l. Деформаци стержн передаетс на тензометрический преобразователь. Устройство неудобно тем, что стержень вносит погрешность в движевне ленты.Devices are known for measuring the tension level of a moving magnetic tape, made on the basis of mechanical-to-electrical transducers. Such devices include a magnetic tape tension meter based on the use of the HSS, which is in direct contact with the magnetic tape l. The rod deformation is transmitted to a strain gauge transducer. The device is inconvenient because the rod introduces an error in the moving tape.

Более точным вл етс устройство, выполненное на базе полукруглой измерительной головки 2. Но это устройство сложно по своей конструкции, так как в него вход т разные по р кг пластины, в. сама головка выполн етс с плоским участком.The device made on the base of the semicircular measuring head 2 is more accurate. But this device is complicated in its design, since it includes plates of different p kg, c. the head itself is made with a flat portion.

Наиболее близким по технической сущности к предлагаемому вл етс устройство дл измерени нат жени магнитной ленты , содержащее пьезопреобразователь и питающий его генератор 3j. Это устройст достаточно качественно осуществл ет измерени , но только с учетом посто нной составл ющей , переменную ss.e составл ющую частоты колебаний движущейс магнитной ленты с помощью этого устройства нельз измерить.The closest in technical essence to the present invention is a device for measuring the tension of a magnetic tape, comprising a piezo transducer and a generator 3j supplying it. This device measures sufficiently qualitatively, but only taking into account the constant component, the variable ss.e component of the oscillation frequency of a moving magnetic tape with this device cannot be measured.

Цепъ изобретени - возможность измерени переменной составл ющей частоты колебаний движущейс ленты.The circuit of the invention is the ability to measure the variable component of the oscillation frequency of a moving belt.

Claims

This operation is realized by supplying the device with a resonator, made in the form of two one-piece cylinders of different diameters, and connected to a piezoelectric transducer by a series chain consisting of a detector, a low-pass filter, an amplifier and a computing unit, with a larger diameter cylinder coupled to the piezoelectric transducer, the cylinder of smaller diameter is located with a gap at the level of the belt, perpendicular to the longitudinal geometric axis of its movement. FIG. 1 shows a block diagram of the described device; in fig. 2 - piezo-former and resonator. In the process of movement, magnetic tape 1 moves past a resonator consisting of two one-piece cylinders 2 and 3. The resonator starts working only when the generator 4 is turned on, and the signal is processed using detector 5, low-pass filter 6, amplifier 7 and computing unit 8. In this case, the resonator is driven by a ceramic-type transducer, and in the name of a piezoelectric transducer 9. During movement, the magnetic tape receives some oscillations associated with both the state of its working layer and the base and the state The paths of the tape mechanism are copied (not shown). At the same time, the cylinder 3 of a smaller diameter oscillates, resulting from the action of a piezo transducer on it. And then there is a change in the gap 10 between the tape and the cylinder 3. The electrical signals arising in this process are processed in the electrical circuit, consisting of a detector, a filter, an amplifier, and a computing unit. Each of these elements or blocks works according to a well-known principle. Expansion of the functional features of the system carrying out measurements on the variable component (if the measurement is known by the constant component), allows us to have a more accurate idea of the tape mechanism and the quality of the tape itself. The invention The device for measuring the tension of a magnetic tape, which contains a piezoelectric transducer and a generator that feeds it, is due to the fact that it is possible to measure the variable component of the oscillation frequency of a moving tape, it is equipped with a resonator made in the form of two one-piece cylinders of different diameters and a serial chain connected to a piezoelectric generator consisting of a decider, a low-pass filter, an amplifier of the computing unit, and a cylinder of a larger diameter women with piezoelectric transducer, and the smaller diameter cylinder is located with a gap at the level of the tape perpendicularly to the longitudinal axis geoetricheskoy its movement. Sources of information taken into account in the examination; 1. Patent of the GDR No. 69958, cl. 42k, 7/02, 1969.

2. The author's certificate number 295139,. Cl. Gil At 27/10, 1969.

3. Copyright certificate №453595, M. Kl.a & 01 L 5/04, 1973 (prototype).

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