JPS6235219Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a time signal switch mechanism for watches and the like.

In conventional watches with electronic time alarm devices, the time switch mechanism is often simply turned on and off via a switch lever that engages with a minute cam, but this causes chattering. It was easy for the electronic time signal circuit to malfunction.
In order to solve this problem, an improvement was proposed in which a compression spring was interposed between the switch lever and the switch spring piece to perform the switching action instantaneously. However, this time, a so-called dead point is generated due to the balance between the contact pressure of the switch spring piece and the spring force of the compression spring during switching, and the contact pressure of the switch spring piece becomes almost equal to zero in the dead point region. Therefore, when switching from the on state to the off state, the contact of the switch spring pieces in this dead point area becomes extremely unstable, which causes problems in stabilizing the switching operation, such as making malfunctions more likely. . Therefore, in order to perform the switching operation stably, it is necessary to appropriately control the contact pressure of the switch spring piece and the spring force of the compression spring, and since this control is also difficult, it is necessary to properly control the contact pressure of the switch spring piece and the spring force of the compression spring. This resulted in new problems being raised in the field.

The present invention was devised in view of the above-mentioned circumstances, and aims to facilitate quality control and stabilize operation in addition to preventing chattering.

To explain an example, in FIG.
The cam 1 is driven by a clock mechanism (not shown), and in this example is set to rotate once every 12 hours. The cam 1 has at least one stepped portion 1a.
The cam surface has a gentle slope from the valley to the peak of the stepped portion 1a. The release lever 3, which is swingable about the shaft 2, has one end 3a in sliding contact with the cam surface of the cam 1, and the other end 3b in contact with the side surface of the switch lever 4. 1 on the board 5
The base portions 6a, 7a of the pair of switch spring pieces 6, 7 are fixed. A portion of the base 6a has a vertically bent portion 6b.
is provided, and one end 4a of the switch lever 4 is swingably supported between this vertically bent portion 6b and the base plate 5. The switch spring pieces 6 and 7 are provided so as to extend toward the tip end 4b of the switch lever 4 so as to be opposite to each other. End 4b of switch lever 4 and end 6c of switch spring piece 6
A compression spring 8 made of a plate spring is connected between the switch spring 7 and the switch spring 7, and in the state shown in FIG. The separation position of the switch spring piece 6 is regulated by a position regulating member 9. Further, a position regulating member 10 is fixedly disposed between both switch spring pieces 6, 7, and these position regulating members 10 and 9 hang integrally from an intermediate base plate (not shown) supported by the switch lever 3, etc. It was established. The position regulating member 10 is set to regulate the position of the switch spring piece 7 when it is off as shown in FIG. 1, and to regulate the position of the switch spring piece 6 when it is on as shown in FIG.

To explain the operation, FIG. 1 shows a state immediately before one end 3a of the release lever 3 falls from the crest of the cam 1, and the other end 3a of the release lever 3
b is in the forward position, and the switch lever 4 is also pushed by it, causing the end portion 4b to move forward to the right. At this time, the compression spring 8 exerts a force that springs the switch lever 6 to the left, and the retreat position of the switch lever 6 is regulated by the position regulating column 9. As a result, the end 7b of the switch spring piece 7 and the switch spring piece 6 are separated, and the switch is turned off. As time passes, the cam 1 rotates counterclockwise, and the one end 3a of the release lever 3 finally falls from the peak to the valley of the cam 1 as shown in FIG. When the other end 3b of the release lever 3 retreats to the left, the pressure on the switch lever 4 is released, and the switch lever 4 receives a counterclockwise rotational force from the compression spring 8. It follows the end 3b of the release lever 3 and is rotationally displaced to the left about the end 4a. When the switch lever 4 is displaced from the position shown in FIG. 1 to the position shown in FIG. At the moment of passing, the spring force of the compression spring 8 is switched in a direction to spring the switch spring piece 6 to the right. As a result, the switch spring piece 6 is instantly displaced to the position where it comes into contact with the position regulating member 10, and at this time, the switch spring piece 6 pushes the end 7b of the switch spring piece 7 to the right, and the switch is turned on. Time device (not shown)
is activated. In the switch-on state shown in the second figure, the position of the switch spring piece 6 is set to the position regulating member 1.
0, the end portion 7b comes into contact with the switch piece 6 with contact pressure based on the spring force of the switch spring piece 7 alone.

As the cam 1 further rotates counterclockwise with the passage of time, the one end 3a of the release lever 3 is gradually pushed upward by the cam surface of the cam 1, thereby rotationally displacing it clockwise. . The other end 3b of the release lever 3 thereby moves forward to the right and pushes the switch lever 4 back to the right. The end portion 4b of the switch lever 4 passes through the neutral position, that is, the dead point region, where the spring force of the switch spring piece 6 becomes almost equal to zero. However, as mentioned above, the switch spring 6 and the switch spring 7 are in contact with each other with sufficient contact pressure due to the spring force of the switch spring piece 7.
Even in the dead point region, the contact between the switch springs 6 and 7 does not become unstable. At the moment when the end 4b of the switch lever 4 passes the neutral position, the spring force of the compression spring 8 switches to the direction of springing the switch spring piece 6 to the left. The switch instantly retreats to the position where it abuts, separates from the end 7b of the switch spring piece 7, and turns off the switch. At this time, when the switch spring piece 7 is released from its pressure, it restores itself by its own spring force, but since it is restricted by the position regulating piece 10, further free deformation due to inertia is prevented. Finally, the release lever 3 and the switch lever 4 also return to their positions in FIG. 1.

In the embodiments described above, a coil spring may be used as the compression spring 8, and the switch lever 4 may move in parallel to the left and right in pursuit of the end 3b of the release lever 3. Furthermore, the position of the switch spring piece 7 when the switch is off and the position of the switch spring piece 7 when the switch is on can be controlled by separately provided position regulating members.

According to the present invention described in detail above, the click motion of the switch spring piece 6 by the compression spring 8 allows the switch to be turned on and off instantly even if the movement of the switch lever 4, etc. is slow, and no chattering occurs. Of course, in addition to this, the presence of the position regulating member 10 separates the spring force of the switch spring piece 7 (contact pressure when turned on) and the spring force of the compression spring 8 (click motion force). Since the settings can be made, the operation becomes stable, and there is no need to strictly manage the spring forces of the switch spring 6 and the compression spring 8. Also switch spring 7
Since the spring force acts only in a direction that promotes the reversal of the compression spring 8, its manufacture and quality control are easy. Therefore, design manufacturing and quality control become very easy.

[Brief explanation of the drawing]

The drawings show an embodiment of the time signal switch mechanism according to the present invention; FIG. 1 is a front view of the switch in the off state, and FIG. 2 is a front view of the time switch in the on state. DESCRIPTION OF SYMBOLS 1... Cam, 1a... Paragraph part, 3... Release lever, 4... Switch lever, 6... Switch spring piece, 7... Switch spring piece, 8... Compression spring, 10... Position regulating member.

Claims (1)

[Utility Model Registration Claim] In a time signal switch mechanism of a clock or the like which opens and closes a time signal switch via a cam which rotates in conjunction with a clock mechanism and has at least one step portion, a release lever is provided which engages with the cam and is swung by its rotation, a switch lever is provided which engages with the release lever and is displaced by its swinging, a pair of switch spring pieces are provided which have bases fixedly attached and which extend oppositely towards the vicinity of the ends of the switch levers, a compression spring is connected between the end of the switch lever and one end of the both switch spring pieces for resiliently switching the one switch spring piece in a direction of contact or separation with respect to the other switch spring piece depending on the position of the switch lever, and a position regulating member is fixedly disposed between the both switch spring pieces for regulating the position of the other switch spring when separated and the position of the one switch spring when contacted, A time-speaking switch mechanism for a clock, etc., characterized by the above.