JPS5850506Y2 - slide device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a slide device in which a slide plate slides smoothly on a substrate.

For example, in a cassette-type tape recorder, the magnetic head, pinch roller, etc. are attached to a slide plate, and the slide plate is biased by a return spring in a direction away from the cassette loaded on the reel shaft.
The slide plate is slid toward the cassette at appropriate times to bring the magnetic head and pinch roller into contact with the magnetic tape inside the cassette.

By the way, in this case, it is necessary to slide the slide plate in a specific direction without moving it up or down relative to the board, so the slide board is constantly pressed in the direction of the board using a retaining spring such as a leaf spring. , it has been considered to slide the slide plate in this state.

However, when the slide plate is pressed toward the board by the holding spring, the elastic force of the return spring gradually changes depending on the amount of displacement, that is, the position of the slide plate, whereas the elastic force of the holding spring is always constant. Therefore, if the elastic force of the retaining spring is set when the slide plate is closest to the cassette, that is, when the elastic force of the return spring is at its maximum, the return movement of the slide plate by the return spring will be inhibited by the retainer spring. In addition, if the elastic force of the holding spring is set so that the slide plate is farthest from the cassette, that is, the elastic force of the return spring is at its minimum, then when the slide plate moves toward the cassette, the slide plate will not move toward the board. A problem arose in that it could not be pressed sufficiently in the direction.

This idea was made to solve this problem by making the elastic force of the retaining spring gradually change depending on the position of the slide plate, without interfering with the return movement of the slide plate by the return spring. Moreover, it is an object of the present invention to provide a slide device in which the slide plate is sufficiently pressed toward the substrate to prevent its vertical movement, so that the slide plate slides smoothly on the substrate.

An embodiment in which this invention is applied to a cassette tape recorder will be described below with reference to the drawings.

A pair of left and right reel shafts 2, 2 for loading tape cassettes, a capstan shaft 3, etc. are mounted on the upper surface of the substrate 1.

Further, a slide plate 4 is placed on the substrate 1 so as to be slidable in the direction of the reel shaft 2 through guide rollers 5 at the four corners.

The left and right portions of this slide plate 4 are pressed toward the substrate 1 via steel balls 7.7 for transfer at one ends of leaf springs 6, 6 that act as holding springs.

The other end of each of these leaf springs 6, 6 is fixed to the substrate 1.

An erasing head 8 and a recording/reproducing head 9 are fixed on the slide plate 4, and one end of a pinch lever 10 is pivotally supported.

A pinch roller 11 is pivotally supported at the center of the pinch lever 10.

Further, the pinch lever 10 is rotationally biased in the direction of the capstan shaft 3 by a deployment spring 12, and its other end is brought into contact with a cut-and-raised piece 13 of the slide plate 4.

Further, the slide plate 4 is slidable in the direction of the reel shafts 2, 2 by pressing a push button mechanism 14 provided on one side of the base plate 1, and normally the return springs 15, 15
As a result, the reel shafts 2, 2 are biased in a direction away from the reel shafts 2, 2.

As shown in FIG. 2, each guide roller 5 interposed between the substrate 1 and the slide plate 4 has small diameter roller portions 17 and 17 protruding from both sides of a flange portion 16. A long hole 1 that is long in the sliding direction of the slide plate 4 is bored so that the portion 16 corresponds to the base plate 1 and the slide plate 4.
8 and 19, and the roller portions 17 and 17 are interposed between the upper surface of the substrate 1 and the lower surface of the slide plate 4.

Further, a guide groove 20 that is long in the sliding direction of the slide plate 4 is formed on the lower surface of one end of the plate spring 6 by cutting and bending, and the steel ball 7 is pressed from above with the bottom surface of the guide groove 20. There is.

On the other hand, in the portion of the slide plate 4 corresponding to each of the guide grooves 20, there is an engagement hole that is long in the sliding direction of the slide plate 4 as a holding force adjustment part and has a tapered shape that is wide on the reel shaft 2°2 side. 21 are bored, and the steel balls 7 are configured to roll along both side edges of each engagement hole 21.

In the tape recorder configured as described above, by pressing the push button mechanism 14, the slide plate 4 can be slid in the direction of the reel shafts 2 against the return springs 15, 15.

Furthermore, the slide plate 4 has a slot 1B in which the flange portion 16 of each guide roller 5 is bored into the base plate 1 and the slide plate 4.
, 19, and the steel ball 7 rolls along both side edges of the engagement hole 21 formed in the slide plate 4, so that the reel shaft 2,
Slides in two directions.

Furthermore, since the slide plate 4 is placed on the substrate 1 via the roller portion 1T of the guide roller 5, it slides smoothly.

Moreover, since the diameter of the roller portion 17 of the guide roller 5 can be easily formed with high precision, the height position of the slide plate 4 with respect to the substrate 1, and even the erasing head 8 fixed on the slide plate 4, can be adjusted easily. The height position of the recording/reproducing head 9, etc. can be accurately defined, and the vertical movement of the slide plate 4, the heads 8, 9, etc. can be reliably prevented by the leaf springs 6, 6.

In addition, since the engagement hole 21 of the slide plate 4 against which the steel ball 7 is pressed has a wide tapered shape on the reel shaft 2, 2 side, as the slide plate 4 moves in the direction of the reel shaft 2, 2, the engagement hole 21 of the slide plate 4 is pressed. The height of the ball 7 increases, the amount of displacement of the leaf spring 6 increases, and its elastic force gradually increases.

That is, when the elastic force of the return spring 15 increases as the slide plate 4 moves in the direction of the reel shaft 2,
The elastic force of the leaf spring 6 also increases, and the floating of the slide plate 4 is reliably prevented.

Conversely, the elastic force of the return spring 15 decreases as the slide plate 4 moves away from the reel shafts 2, 2, but at this time the steel ball 7 enters deeply into the locking hole 21 and its height dimension increases. The amount of displacement of the leaf spring 6 decreases, and the elastic force of the leaf spring 6 gradually becomes smaller, so that the return operation of the slide plate 4 is not hindered.

Note that this invention is not limited to the above embodiment.

For example, the holding force adjustment section may be configured to gradually reduce the elastic force of the holding leaf spring as the slide plate returns, so for example, a cam surface may be formed on the top surface of the slide plate, and the cam surface The ball may be configured to roll along the slide plate, and the amount of displacement of the holding leaf spring, that is, the elastic force may be changed depending on the position of the slide plate.

As detailed above, according to this invention, the elastic force of the holding leaf spring is configured to gradually change depending on the position of the slide plate, thereby inhibiting the return operation of the slide plate by the return spring. Moreover, it is possible to provide a slide device in which the slide plate is sufficiently pressed toward the substrate to reliably prevent its vertical movement, and the slide plate slides smoothly on the substrate.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of this invention, Fig. 2 is a perspective view showing a guide roller used in the same embodiment, Fig. 3 is a sectional view taken along line X-X in Fig. 1, FIG. 4 is a sectional view taken along the Y--Y line in FIG. 1 as well. 1... Board, 4... Slide plate, 6... Leaf spring (
Retention spring), 15...Return spring.

Claims (1)

[Scope of utility model registration request] In a device that performs a predetermined operation by moving a slide plate that is slidably provided on the top surface of a substrate in one direction, a return device that is hung between the substrate and the slide plate to return the slide plate to its initial position. a spring, a steel ball for transfer placed on the top surface of the slide plate, and a holding ball with one end fixed to the board and placed facing the top surface of the slide board to push the steel ball toward the board. A plate spring is provided in the range in which the steel balls of the slide plate roll so that the width thereof gradually becomes narrower in the return direction of the slide plate, and as the slide plate returns, the width of the steel balls becomes wider. A slide device comprising: an engagement hole that lowers the position of the steel ball and gradually reduces the amount of elastic deformation of the holding leaf spring by moving in the opposite direction.