CS202689B1 - Clamping facility for flexible magnetophone record - Google Patents

Abstract

The component is designed to stretch and mount a flexible magnetic record disc in the centre of a record carrier. It comprises a central spigot (11) with a number of curved rotationally symmetric spring arms, each attached to a centralising former (13) and a flat outwardly extending flange (12) which is in contact with the upper surfaces of the disc. The included angle between the centralising arms is in the range from 55 deg. to 85 deg., and the arms are preferably three in number. The required compressive and tensile forces are produced by a central helical coil spring coaxial with the spindle.

Description

The invention relates to a clamping device for a flexible plate. which is covered with a non-sealable layer, together with a protective sleeve, is inserted into the data memory and, for recording and reproduction purposes, is in contact with or close to the mean ^{and the} etophoeian head.

In German Pat. No. 2,107,184, a tensioning device for flexible cassette recorders has been described in connection with the measuring plate memory, in which the flexible maantheter plate is inserted into the plate memory together with the protective sleeve, it is centered by means of a cone extending into its central bore and connected to the drive spindle.

Another solution according to NSR-DOS No. 2. No. 3,330,358 assumes that the flexible monofilament plate together with the bracket is adapted to move toward the drive spindle or away from the spindle. of this spindle and the clamping device which is mounted on the holder is clamped relative to the drive spindle ·

A shortcoming of both types of clamping is that, due to the inevitable manufacturing, by tolerating the central bore in the flexible plate and the recess in the drive spindle, and due to their wear, up to < tb > - mechanical rub

As a result, the reprocessability of the concentric recording tracks, especially at the high track density to be achieved in the future, is not more satisfactory.

In German Patent No. 2,330,818, these deficiencies are eliminated by a device which is extensible and which extends into the generic aperture of a flexible tape recorder and which is extended by a wedge-shaped device. However, the construction of this tensioning device requires relatively high construction costs. Furthermore, the provision of the free-displaceable extension of the extensible device required for perfect centering on its shaft bearing and the generation of a spring-tensioning force results in a large construction height of the tensioning device, since the wedge machine construction elements do not allow for advantageous design.

Cutting & VYN purpose is to reduce the re-thiram high design expense knows ^Y = OH. tensioning devices for flexible majantophone plates and zajjstiti. height of the proposed solution.

Wcolem vyinfrezu is formed using jectaoduohyo ^h instruction switching elements such zaHzení, the aminoester umožniu® exactly one hundred Å ^ ^- friendly flexible clamping m ^ ^y ntofcnové desk on the drive shaft.

According to the invention, this object is achieved in that the support clamping element consists of:. a plurality of curved, rotationally symmetrically arranged spring arms at its outer ends are arranged at right angles to each other at two angles, one at a time. the bearing surface serves for centering, and the second bearing surface is for driving the tenth flexible tape.

An advantageous embodiment of the invention consists in that the curvature of the spring arms is circular and the respective central angle between the pin and the bearing surfaces is in the range of 55 ° to 85 °, a certain force on the pin being produced. by means of a pressure spring which is arranged on the pin or which is located inside the pin, whereby - in the latter case - a tensioning force is exerted on the pressure spring by means of a disc with an excessive pin. The function of the support clamping element is that when generating a force acting in the axial direction, the clamping element pin is gripped at the ends of the curved, rotationally symmetrically arranged spring arms of the horizontal and vertical force components, which cause the flexible maagtophone to first be to this end, the driveline is coupled - with the spindle, - driven by the motor.

The invention will be explained in more detail below with reference to the exemplary embodiment shown in the accompanying drawings.

1 is a front view of a clamping device with a pressure spring arranged outside the device; FIG.

Fig. 2 shows a front view of a clamping device with a thrust spring arranged within the center.

The principle of action of the supporting clamping element is shown.

On giant. 3 Yippee On giant. 4 Yippee On giant. 5 Yippee tributaries A - A < ► On giant. 6 Yippee

Shown Supporting Shown Supporting Shown Supporting element in the form of a tall spring in plan view.

clamping element - in the shape of a disc spring in cross-section along the clamping element with the formation of three curved spring arms in plan view;

Fig. 7 shows a support clamping element s - formed by three curved arms in section along line B - B.

The function of the clamping device will first be explained by Fig. 1 ·

After that, she was. flexible. the microphone plate 30 with its protective sleeve 32 having a recess 33 for receiving the flexible microphone plate 30 in the data memory and the centering hole 21 of the flexible tape plate 30 lies approximately above the recess 22 of the drive spindle 21, then the clamping arm 23 . on which is pivotally mounted a support element clamping JO - tilted around the fixing ODU 24 ^b on the frame data 20 ^{e p} · I am ^{e -} Třrn the Önorm ^{p p} o ^{p dp} Erny clamping tearing ^at 10 which in the example - the embodiment of FIG. 1 is formed as shown in FIG. 6; and FIG.

As a pin 11 with three curved rotationally symmetrically arranged rotary arms. 15, with its resilient arms 15 into the central opening 31 of the flexible microphone plate 30 and into the recesses 22 of the drive spindle 21. Upon further downward movement of the clamping arm 23, whose movement may additionally be associated with closing the door of the data memory, bias 14 of the flexible arm 15 firstly pre-centering the flexible cassette 30 until the support fixture 10 abuts with its bearing surface 12 - for driving friction against the flexible cassette 30 and the drive spindle 21; 3, in which the force ratios of one symmetrically arranged and curved spring arm 15 are shown. The downwardly tilted clamping arm 23 is exerted on the curved spring arms 15 by a pressing force F _n proportional to the pressure path. This thrust force causes both vo the horizontal force component Fg, which causes the support clamping element 10 to expand, and the vertical force component Fg, which causes the thrust and pressure, respectively. pressing the flexible cassette 30 onto the front face 25 of the drive spindle 21 In this construction of the elastic arms 15, it is necessary to ensure that the shear force Fg _R , counteracting the sliding of the centering bearing surface 13 - -. It was still less than the horizontal force component - in the direction of the inner side - the recess 22 in the drive spindle - 21 At the same time, it is necessary to ensure that friction bearing surfaces 13 'for the centering on the inner side the forces ^P AH on the bearing surfaces 13 for the centering are constantly measured than the vertical component F 1 on the bearing surfaces 12 for the friction drive. As a result of these two conditions, it is ensured that the flexible meogietophone plate 30 is movable for centering when the support clamping element 10 is fitted, and secondly that the spontaneous locking of the clamping device and the clamping of the spring arms 15 in the recess are prevented. of the driving spindle 21 by tests. it has been shown that optimum conditions are achieved when the elastic arms 15. For example, the fraction of the horizontal and vertical forces F - and Fg corresponds to the friction coefficient of the bearing surfaces 12 and 13 associated with the horizontal and vertical forces F sil and Fg. A collaborative creation of curved elastic - they are podmídcy arms, as shown calculations - in ^ met in the characteristics dslosti ma ^ ri. & U ^- ^ libovolnn when m number of different ^p. ramen ¹⁵ v ro ^zs ahu. ^{tion with} Tred ° angle ^<- = 55 ° - 85 ° with a central angle - the angle between the pin 11 and the bearing surfaces - J2 J2 ·

Another embodiment of the disc spring-like support element 10 is shown in Figures 4 and 5, however, this embodiment requires precise guidance of the support clamp 10 when immersed in the center hole 31 of the flexible tape recorder 30 because its ability to magnify with the same material properties is 6 and 7 · Therefore, it is expedient to fasten! the support clamping element 10, with its pin 11, can be moved radially displaceably or tilted in the clamping arm 23 so that slight tolerances can be compensated when the clamping element is immersed in the recesses 22 of the drive spindle 21. the diameter of the recesses 22 in the drive spindle 21 is slightly, about 0.01 mm larger than the diameter of the central bore 31 of the flexible tape 30 to ensure that the flexible tape 30 is seated on the drive spindle 21 without play. a sufficient vertical force component Уд is formed on the bearing surface 12 · which is sufficient for the frictional entrainment of the flexible cassette 30 · due to the dimensioning of the pressure spring 18.

FIG. 2 shows another exemplary embodiment for the entire tensioning device, in which, due to the special design of the pin 11 of the supporting clamping element 10 and due to the arrangement of the pressure spring 18, a particularly low construction height of the tensioning device is obtained. in the hollow bolt 11, wherein the thrust force is exerted by the disc 16 and the thrust bolt 17 and by the clamping arm 23 on the supporting clamping element 10. The thrust bolt 17 can be firmly connected to the clamping arm 23 because with the flat disc 16, the support clamping element 10 is axially displaceable with almost no retraction.

The release of the plate is carried out in both the embodiments of FIGS. 1 and 2 as a result of pulling the support clamp 10 out of the central hole 31 of the flexible tape recorder 30 by means of the clamping arm 23. Protect case 32 from data memory manually or by ejector ·

Claims (5)

OBJECT OF THE INVENTION Clamping device for a flexible tape recorder placed in a protective sleeve, characterized in that it consists of a pin (11) with a plurality of curved, rotationally symmetrically arranged spring arms (15) »at the outer ends of which are arranged two perpendicular to each other arranged support surfaces (12, 13), wherein one support surface (13) is for centering and a second support surface (12) for frictional support of the flexible tape recorder (30). Clamping device according to claim 1, characterized in that the curvature of the spring arms (15) is of circular shape and the respective center angle between the pin (11) and the bearing surfaces (12, 13) is in the range of 55 ° to 85 °. Clamping device according to claim 1, characterized in that the bearing surfaces (13) for the centering are inclined. Clamping device according to claim 1, characterized in that a pressure spring (18) is arranged on the pin (11). Clamping device according to claim 1, characterized in that a pressure spring (18) is arranged inside the pin (11).