JP2513003Y2 - Switching mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wire switch adjusting mechanism using a coil spring or the like.

[Conventional technology]

For example, a trigger switch that forms an electric signal in an electric control circuit of a camera or the like can adjust its switch timing, but FIGS. 5 and 6 show a conventional leaf switch having such a structure. An example is shown. First, in FIG. 5, the contact piece 11 ′ of the contact pieces 11 and 11 ′ arranged at regular intervals is the contact piece 11 ′ by the eccentric dowel 12 which eccentrically rotates around the support shaft 12 a. The above-mentioned distance between the contact piece and the elastic piece is adjusted, and in the case of FIG.
An eccentric dowel 12 adjusts the distance between the tip of 13 and the fixed dowel 14. Further, FIG. 7 shows a fixed support shaft 16 in the example of the wire switch using the coil spring 15.
The position of the one end 15a of the coil spring 15 wound around the coil spring 15 is adjusted by the eccentric dowel 12. In either case, the contact piece 11, the contact piece 13 and the coil spring 15 are adjusted.
It is possible to adjust the switch timing due to the operation of the one end portion 15a.

[Problems to be solved by the device]

However, in such a conventional switch, especially in the case of the examples of FIGS. 5 to 6, the number of components of the switch is large, and in the case of the example of FIG. 7, the number of components is small, After adjustment by the eccentric dowel 12, it is necessary to solder the eccentric dowel 12 to a substrate or the like in order to prevent contact failure, etc. Therefore, the contact surface for conduction is soiled by the flux of the solder, etc. There was a problem of lack of reliability. Also, it was not possible to readjust after this soldering.

In view of such circumstances, an object of the present invention is to provide a switching mechanism that requires a small number of parts and has high reliability that makes soldering after eccentricity adjustment unnecessary.

[Means and Actions for Solving the Problems]

In the switching mechanism according to the present invention, one end side of the coil spring wound around the support shaft is fixed to the substrate and the other end side is pushed to be brought into contact with the fixed contact. The winding part is eccentric.

Therefore, only by eccentrically rotating the spring winding portion, the position of the other end side, that is, the switch timing can be adjusted while the one end side of the coil spring is fixed to the substrate.

Further, according to the present invention, in the spring winding portion of the support shaft, a portion corresponding to one end side of the coil spring is concentric with the shaft attachment portion of the support shaft and corresponds to the other end side of the coil spring. The part is eccentric to the shaft attachment part.

Therefore, when adjusting the eccentricity by rotating the spring winding portion of the support shaft, one end side of the coil spring fixed to the substrate is wound around the spring winding portion of the portion concentric with the shaft attachment portion of the support shaft. As a result, it is not subject to any biasing action and therefore no stress is produced thereby.

〔Example〕

Hereinafter, a first embodiment of a switching mechanism according to the present invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes a substrate, which is connected to the ground side in an electric control circuit of a camera, for example. Reference numeral 2 is a support shaft in which a spring winding portion 2b is eccentrically arranged with respect to a shaft attachment portion 2a with respect to the substrate 1, and 3 is one end side of which is wound around a spring winding portion 2b of the support shaft 2.
The tip 3a ₁ of 3a is fixed to the substrate 1 by soldering or the like, and the other end 3b can be elastically contacted with a fixed dowel 4 as a switch contact. may be a lever or it interlocking member or the like, but fix the other end 3b of driving boss 5b acts on the tip end 3b ₁ of the coil spring 3 by reciprocating about a pivot 5a dowel 4 It is a lever that can be brought into and out of contact with. In the above case, gold plating or the like is applied to the coil spring 3, especially on the other end side 3b thereof, in order to improve conductivity when the coil spring 3 contacts the fixed dowel 4.

Since the switching mechanism according to the present invention is configured as described above, when adjusting the switch timing by the contact between the other end side 3b of the coil spring 3 and the fixed dowel 4, the contact state of both is shown in FIG. At spindle 2
The spring winding portion 2b is eccentrically rotated by rotating the shaft around the shaft mounting portion 2a to the right or left, whereby the other end side 3b of the coil spring 3 is biased as shown in FIG. Be punished. Then, the tip 3b ₁ of the other end side 3b is adjusted distance between the driving boss 5b of the lever 5 by a distance l, thus, the other end 3b and the drive hub 5b is performed by acting on the tip 3b ₁ The switch timing between the fixed dowels 4 is the distance l
Is adjusted by the amount corresponding to.

In such adjustment of the switch timing, the tip 3a ₁ on the one end side 3a of the coil spring 3 and the fixed dowel 4 need to remain fixed, and especially after the eccentricity adjustment, the fixed dowel 4 and the tip 3a ₁ are attached to the substrate 1. Eliminates the need for soldering, etc. Therefore, since there is no particular danger of flux or the like adhering to the other end side 3b, reliability such as conductivity is guaranteed. Further, since it is sufficient to operate only the support shaft 2 for timing adjustment, the work is simple and reliable.
Since a coil spring is used as the switch, it is of course advantageous in reducing the number of parts as compared with a leaf switch or the like.

FIG. 4 shows a second embodiment of the switching mechanism of the present invention. In this example, the spring winding portion 2b of the shaft 2, the portion (Fig. 4 2b ₁ corresponding to one end 3a of the coil spring 3
In parts) of the shaft attaching portion 2a coaxial with, and as part corresponding to the other end 3b of the coil spring 3 ₍₂ Section 4 Figure 2b) is the shaft attaching portion 2a and the eccentric, the shaft attachment The portion 2a side is formed to have a small diameter.

When the switch timing is adjusted by rotating the support shaft 2, the other end 3b of the coil spring 3 is eccentrically rotated by the eccentric rotation of the portion 2b _{2 around} which the coil spring 3 is wound, Thereby, a desired switch timing can be obtained. On the other hand, one end 3a, since the portion 2b ₁ of the support shaft 2 is wound it also rotates and an axis attaching portion 2a coaxial with, not subjected to quite urging action different from the other end 3b. Therefore, since stress or the like due to the deviation does not occur on the one end side 3a, the strength and the durability are substantially improved, and the effect obtained by fixing the tip 3a1 of the _one end side 3a is obtained. Can be effectively guaranteed.

The switching mechanism of the present invention can be applied not only to the case of a camera but also to this kind of electric circuit, and the same effect as the above can be obtained.

[Effect of device]

As described above, according to the present invention, it is possible to provide a highly reliable switching mechanism that ensures easy and reliable adjustment of the switch timing and ensures proper operation as a switch. Further, there is an advantage that the number of partial points can be reduced.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a first embodiment of a switching mechanism according to the present invention, FIG. 2 is a plan view of the switching mechanism showing a state before switch timing adjustment, and FIG. 3 shows a state after switch timing adjustment. FIG. 4 is a plan view of the switching mechanism, and FIG. 4 is a perspective view of a spindle around which a coil spring is wound according to a second embodiment of the switching mechanism of the present invention.
5 and 6 are plan views showing a configuration example of a conventional leaf switch, and FIG. 7 is a plan view showing a configuration example of a conventional wire switch. 1 ... Substrate, 2 ... Support shaft, 2a ... Shaft attachment part, 2b ... Winding part, 3 ... Coil spring, 4 ... Fixed dowel, 5 ...
lever.

Claims (2)

(57) [Scope of utility model registration request] 1. A switching mechanism in which one end side of a coil spring wound around a support shaft is fixed to a substrate, and the other end side is a movable contact that can move to and from a fixed contact.
A switching mechanism characterized in that a spring winding portion of the support shaft is eccentric. 2. The spring winding portion of the support shaft has a portion corresponding to one end side of the coil spring concentric with the shaft attachment portion of the support shaft and corresponding to the other end side of the coil spring. The switching mechanism according to claim (1), characterized in that a portion is eccentric with the shaft attachment portion.