SU711626A1 - Device for advancing information carrier tape - Google Patents

Description

The invention relates to the field of instrumentation, namely, devices for moving information carriers and can be used in tape mechanisms of magnetic recording equipment. $

Known devices for moving a tape information carrier, consisting of piezoelectric elements connected to a source of periodic electrical voltage [11 and [2]. ·

The designs of such mechanisms are complex due to the presence in them of a mechanical connection between the individual piezoelectric elements, they do not provide a high frequency of steps for moving the tape and the reliability of the device.

The closest to the technical essence of the invention is the piezoelectric stepper motor of the magnetic recording apparatus 20, made in the form of a two-section structure, each section of which consists of two piezoelectric bimorph elements rigidly connected (glued) to each other, forming a T-shaped structure [3 ].

When the control voltage is applied, the clamping piezoelectric bimorph elements of the sections with rubber pads riveted at their free ends, bending toward the tape, capture it, and the moving bimorph elements, bending, create movement of the clamping elements with the tape captured by them.

The described device due to the presence of a mechanical connection between the bimorph. elements forming sections, has a relatively complex structure and low operational reliability.

Moreover,. due to the relatively large effective mass (two bimorph elements connected to each other) involved in the vibrational motion, a high frequency of steps ’of moving the tape cannot be achieved.

The purpose of the invention is to increase the reliability and speed of the device.

This goal is achieved by the fact that the device is equipped with two guide elements, each of which is made with a rectangular window, and the aforementioned piezoelectric plates located on both sides of the tape information carrier are alternately mounted with their ends on the housing, and others interact with the specified tape carrier information, and all the plates are installed between the guide elements, in the windows of which a tape medium is placed.

In FIG. 1 schematically shows a device for moving a tape medium; in FIG. 2, 3, 4 - voltage diagram on the plates of piezoelectric plates.

The device consists of a housing 1, piezoelectric plates 2, 3, 4, some ends mounted on the housing 1, others interacting with a tape information carrier 5. The plates 2, 3, 4 are located between two guide elements 6, 7, made with rectangular windows, in which the tape medium 5 is placed.

The device works as follows. The voltage from the source of periodic voltage is supplied to the first plate 2 (Fig. 2) ·.

Due to the inverse piezoelectric effect, this plate lengthens and, acting on the tape 5, causes the displacement of the adjacent free section of the tape.

, At the time when the voltage between the electrical plates of the first plate 2 takes a zero value, it returns to its original position under the action of elastic forces. At the same time, the voltage (Fig. 3) is supplied to the second plate 3, which moves the adjacent portion of the tape, released when the first plate 2 is returned to its original position.

After applying electric voltage to the third plate 4 (Fig. 4), the adjacent portion of the tape is displaced, released after the voltage is removed from the second plate 3 and returned to its original position. After removing the voltage from the third plate 4 and returning it to its original position, the tape moves one step. The process is periodically repeated.

The described process of moving the tape is similar to wave propagation in an elastic medium. In this case, the points of the medium that perform mechanical vibrations correspond to the ends of the piezoelectric plates interacting with the tape, and the propagating wave corresponds to the movement of adjacent adjacent sections of the tape.

The speed and direction of movement of the tape, respectively, depends on the frequency, amplitude and alternation: phases of the supply voltage ..

The use of separately installed parallel · single-layer piezoelectric plates with their ends acting on the tape, leads to a simplification of the design, increase its operational reliability and increase the speed of the device.

Claims (3)

The invention relates to the field of boring construction, namely, to devices for moving media and can be applied in tape-making mechanisms of magnetic recording equipment. There are known devices for moving tape media — information, consisting of piezoelectric elements connected to a source of periodic electrical voltage C and the design of such mechanisms is complicated due to the presence of mechanical coupling between the individual piezoelectric elements; they do not provide high frequency tape travel steps and device reliability. The closest in technical essence to the invention is a piezoelectric stepper motor of a magnetic recording apparatus made in the form of a two-piece structure, each section of which consists of two rigidly connected (glued) piezoelectric bimorphic elements forming a T-shaped structure 3. When applying control voltage, clamping piezoelectric bimorph elements of sections with rubber pads stuck at their free ends, bending towards the tape, seizing It is bent, and the propulsive bimoric elements, when bent, create displacements of the clamping elements with the tape gripped by them. The described device is due to the presence of a mechanical connection between the bimorphic ones. elements forming sections, has a relatively complex design and low operational reliability. Besides,. Due to the relatively large effective mass (two interconnected bimorph elements) that take part in the oscillatory motion, a high frequency of the tape movement chaps cannot be achieved. The purpose of the invention is to increase the reliability and speed of the device. , 37 The goal is achieved by the fact that the device is equipped with two guiding elements, each of which is made with a rectangular window and the aforementioned electroelectric plates, located on both sides of the lenticular information carrier, are alternately fixed with their ends to the core nvcG :, 0 by others - interact with the indicated tape carrier of information; all the plates are installed between the guiding elements, in the windows of which the tape carrier of information is placed. FIG. , 1 schematically shows a device for moving a tape information carrier in FIGS. 2, 3, 4 digram stresses on the shafts of piezoelectric plates. The device consists of a body 1 of piezoelectric plates 2, 3, 4, with one end mounted on the body 1, and others interacting with a tape carrier 5. The plates 2, .3, 4 are located between two guide elements 6, 7, made with rectangular windows in which the tape is placed 5.. The device operates as follows. The voltage from the source of a periodic voltage is applied to the first plate 2 (Fig. 2) - .. Due to the reverse piezoelectric effect, this plate lengthens and, acting on the tape 5, causes an overlap of the free area of the belt adjacent to it. At a time when the voltage between the electrical plates of the first plate 2 takes a zero value, it returns to its original position under the action of elastic forces. At the same time, the apectrical voltage (Fig 3) is applied to the second plate 3, which moves adjacent to her section of the tape, released when you return the first plate 2, in the original application. After the electrical voltage is applied to the third plate 4 (Fig. 4), the adjacent portion of the tape is released, which is released after the voltage is removed from the second plate 3 and returned to its original position. After removing the voltage from the third plate 4 and returning it to its original position, the tape is interrupted by one step. The process is periodically repeated. The described process of moving the ribbon is similar to the wave propagation in an elastic medium. At the same time, the ends of the piezoelectric plates interacting with the tape correspond to the points of the medium that perform mechanical oscillations, and the propagating wave of displacing the successive sections of jents that follow each other. The speed and direction of movement of the tape depends respectively on the frequency, amplitude and alternation of the phases of the supply voltage. The use of separately installed parallel single-layer piezoelectric plates, with their ends affecting the tape, leads to a simplification of the structure, an increase in its operational reliability and increased device speed. Claims of Invention A device for moving a tape information carrier, comprising. a casing and at least Greek piezoelectric plates connected to a source of a periodic voltage; characterized in that, in order to increase reliability and bystrodistzi device, it is equipped with two guide elements, each of which is made, with a rectangular window, and the mentioned piezoelectric plates, fixed on both sides of the tape information carrier alternately, with its ends they are fixed on the body, while others - interact with the indicated tape data carrier, all plates being installed between the guides, in the windows of which the tape data carrier is placed. Sources of information taken into account during the examination 1. USSR author's certificate M 356685, class, G 11 V 15/56, 1971. 2..Avtorskoe certificate of the USSR № 584333 ,, cl. G 11 B 15/40, 1976. 3. USSR author's certificate No. 353273, cl. G 11 B 15/40, 1971 (prototype), g7