JPS628662Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a spring-type moving mechanism.

Conventionally, in a spring-type moving mechanism in a tape recorder or the like, as shown in Figs. The spring seat 3 of the board 1 and the spring seat 4 of the movable plate 2 are extremely small.
Even if there is a step a between the two, the spring 9 has been installed while ignoring this. For this reason, move the movable plate 2 to A in the figure.
When the spring 9 moves in the direction shown in FIG. 2, both ends 9a and 9b of the spring 9 rotate clockwise and contract while deforming into a horizontal S-shape, causing the spring 9 to buckle and obtain a predetermined restoring force. There was a problem that the spring could come off due to failure to move the device, or if the device equipped with the moving mechanism was dropped.

In view of the above points, the present invention aims to provide a spring-type moving mechanism that prevents the coil spring from buckling and prevents the spring from coming off due to falling or the like.

Examples of the present invention will be described below.

First, the first embodiment of the present invention shown in FIGS. 4 to 7 will be described. This includes a metal substrate 1, a metal movable plate 2 that is movable in parallel with the substrate, and a spring seat 3. , 4 are formed in the same plane as the respective plates 1 and 2, and the spring seats 3 and 4 have spring receiving edges 5 and 6 that receive the spring end surfaces, and tongue pieces 7 and 8 that define the center of the spring end surfaces. It has a step a between the surface 7a of the tongue piece 7 on the board side and the surface 8a of the tongue piece 8 on the movable plate side, both tongue pieces 7 and 8 are arranged facing each other, and both the spring seats A compression coil spring 9 for reciprocating the movable plates is interposed between 3 and 4, and a synthetic resin protrusion 10 having a semicircular cross section is fixed to the surface 7a of the board side tongue piece 7 to reduce the step a. ing.

The tongues 7 and 8 are considerably smaller than the inner diameter of the coil spring 9 in the vertical direction, and the protrusion 10 has a width smaller than that of the tongue 7. The upper end 10a of the protrusion 10 is slightly lower than the surface 8a of the movable plate side tongue piece 8, and the height difference is b. Reference numeral 11 in the figure is a pin made of synthetic resin that fits into the elongated hole 12 of the movable plate 2 and supports the movable plate 2 in a reciprocating manner. Note that the pin 11 and the protrusion 10
is fixed to the substrate 1 by being partially embedded in the substrate 1 during molding.

In the above configuration, when the movable plate 2 is moved in the direction A in the figure with respect to the substrate 1, the coil spring 9 is pushed by the spring seat 4 of the movable plate 2 and contracts, and the movable plate side end 9a of the spring 9 is moved to the right. rotates around the board side end 9
b also rotates clockwise and tries to deform as a whole into a horizontal S-shape. However, the surface 8 of the movable plate side tongue piece 8
The difference d between the height difference b between the upper end 10a of the spring 9 and the upper end 10a of the protrusion 10 is extremely small, and the difference d between the inner diameter of the spring seat 3 on the board 1 and the inner diameter of the end 9b on the board side is small because the vertical width c of the spring seat 3 of the board 1 is large. The spring 9 is restrained by the protrusion and cannot be deformed into a horizontal S-shape, and as shown in FIG. 6, the spring 9 contracts and deforms to the extent that buckling does not occur. When the operating force of the movable plate 2 in the A direction is released, the movable plate 2 moves back in the B direction due to the return force of the spring 9, and then stops at a predetermined position, and the spring 9 returns to its original position as shown in FIG. The state will be as follows.

Next, a second embodiment of the present invention shown in FIG. 8 will be described. In this, a protrusion 10 is fixed to the surface 7a of the board side tongue piece 7, and the upper end 10a of the protrusion and the surface of the movable plate side tongue piece 8. 8a are on the same horizontal plane, and a protrusion 15 is fixed to the back surface 8b of the movable plate side tongue piece 8, and the lower end 15a of the protrusion and the back surface 7 of the board side tongue piece 7
b are on the same horizontal plane.

In the above configuration, the upper and lower ends of the pair of tongues with protrusions that define the center of the spring end face in the step direction are the same horizontal plane, and there is no step difference between them.
The coil spring 9 is most ideally connected to the substrate 1 and the movable plate 2.
Expands and contracts parallel to.

As is clear from the above description, the present invention provides a substrate and a movable plate that has a step with respect to the substrate and is movable in parallel, with the center of the spring receiving edge receiving the spring end surface and the center of the spring end surface in the step direction. A compression coil spring for reciprocating the movable plate is interposed between the two spring seats, and a protrusion for reducing the step is fixed to at least one of the tongue pieces. It is something that

Therefore, according to the present invention, since the protrusion reduces the level difference between the base plate and the movable plate and restricts the amount of deformation of the end face of the coil spring, the spring does not deform into a horizontal S-shape and buckle as in the conventional case, but can maintain a predetermined shape. This has an excellent effect of providing a spring return force and preventing the spring from coming off the spring seat.

[Brief explanation of drawings]

Fig. 1 is a front sectional view showing the spring return state in a conventional spring-type moving mechanism, Fig. 2 is a front sectional view showing the spring contracted state, and Fig. 3 is taken along the line XX in Fig. 1.
4 is a perspective view showing the first embodiment of the present invention; FIG. 5 is a front sectional view showing the same spring return state;
Figure 6 is a front sectional view showing the same spring in a contracted state;
The figure is a YY sectional view of FIG. 5, and FIG. 8 is a front sectional view showing a second embodiment of the present invention in a spring return state. 1: Board, 2: Movable plate, 3, 4: Spring seat, 5,
6: Spring receiving edge, 7: Tongue piece, 7a: Surface, 8: Tongue piece, 8a: Surface, 8b: Back surface, 9: Compression coil spring, 10: Projection, 10a: Upper end, 15: Projection, 1
5a: Lower end.

Claims (1)

[Scope of utility model registration request] A spring seat consisting of a spring receiving edge for receiving a spring end face and a tongue piece defining a center in the step direction of the spring end face is formed on the base plate and a movable plate having a step with respect to the base plate so as to be movable in parallel. A spring-type moving mechanism characterized in that a compression coil spring for reciprocating the movable plate is interposed between the two spring seats, and a projection for reducing the step is fixed to at least one of the tongue pieces.