JPS5918377Y2 - Mobile watch slip mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a slip mechanism for a hand-display type portable watch with time difference correction.

The object of the present invention is to provide a slip mechanism which is extremely simple in construction and operates reliably, with a minimum thickness.

As a mechanism for correcting time difference in pointer display type watches,
Conventionally, devices using a planetary gear mechanism and devices using a slip mechanism have been considered and put into practical use, but both had problems such as being complicated and resulting in thick watches.

As a conventional example of a slip mechanism, there is
66, JP-A-46-293, etc., but the former is extremely thick and has a complicated structure, and the latter requires processing the magnet to fix it to the gear, both of which have many factors that increase costs. Although it has been put into practical use, it has not yet become widespread.

On the other hand, with the spread of crystal watches, there is an increasing need for a portable watch that can adjust time differences without stopping the watch.

The present invention has solved various conventional problems and made it possible to create a highly complete portable watch with time difference correction.

. Hereinafter, a detailed explanation will be given according to examples.

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a sectional view thereof.

To explain the configuration, the first hour wheel 1. Between the second hour wheel 2,
There are a cam 4 and a jump control lever 3, and the cam 4 is driven and fixed to the first hour wheel 1.

The jump control lever 3 has dowels 3a and 3b at both ends, and a jump control part 3e1.
It consists of an arc-shaped spring 3d, and a dowel 3 is inserted into the hole of the second hour wheel 2.
a and 3b are engaged and held rotatably.

The above-mentioned components are integrally driven into a block by a bushing 5.

6 is the tsutsukana, 7 is the hinoura wheel, and 8, 9, 10.11 are the hour hand, 9 minute hand, main plate, and second kana, respectively.

However, FIG. 1 shows two hour wheels 1 and 2 and a cam 4. Only the jump control lever 3 is shown.

First, under normal conditions, the cam 4 and the jump control lever 3 are engaged, so
The first hour wheel 1 and the second hour wheel 2 rotate integrally.

Therefore, when the cylinder pinion 6 is rotated, the first hour wheel 1 is rotated via the hour wheel 7, and the hour hand 8 fixed to the second hour wheel is rotated, which is the same operation as a normal hour hand. .

The time difference correction is performed by rotating the second hour wheel 2 using an external operating member.

(The external operating member and the corrected wheel train for rotating the second hour wheel 2 are not shown.

) When the jump control lever 3 is bent as shown in 3e, the gap between it and the cam 4 slips, and the front wheel train transfers the torque that causes relative rotation between the first hour wheel 1 and the second hour wheel 2. If the torque is kept lower than the hand movement torque that drives the first hour wheel 1, when the second hour wheel 2 is rotated, only the second hour wheel and the hour hand 8 will rotate while the first hour wheel 1 is locked by the hour wheel 7. do.

If the number of teeth of the cam 4 is set to 12, the second hour wheel 2 and the hour hand 8 will rotate by 30 degrees (one hour) and will not affect the minute hand position.

In this way, time difference correction is possible. The range of the slip torque between the cam 4 and the jump control lever 3 is determined by conditions that do not interfere with normal hand movement and resistance to external disturbances.
Complex mechanisms have been used to manage torque within this range, but the jump control lever of the present invention has extremely high stability because both ends are fixed so that it can rotate freely, and unnecessary loads are not applied to the spring part. , it was possible to ensure a sufficiently long spring length, and it became possible to keep the slip torque within the required range with an extremely simple configuration.

Therefore, it has become possible to provide a slip mechanism with stable quality at a low cost.

As shown in Figure 2, the thickness was reduced to the minimum due to the triple structure of two hour wheels and a cam, making it possible to use it as a time difference correction device for thin and well-designed watches.

In addition, the play in the rotational direction of the two hour wheels is determined by the play in the dowel 3a of the jump control lever 3 and the hole, so it is easy to manage, and there are few sources of variation.The effects of this invention include quality, cost,
There is a lot to offer in terms of design.

In the embodiment of the present invention, the dowels at both ends of the jump control lever and the holes in which the dowels engage have a circular cross section. However, regardless of the configuration, both ends of the jump control lever cannot rotate. Of course, if it is maintained as much as possible, the effects of the present invention will not be hindered.

Moreover, although only the case where the slip mechanism is provided on the hour wheel has been described as an example, the effect of the present invention does not change even if the slip mechanism is used on other gears such as the Hino back gear.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a sectional view thereof. The numbers in the diagram are as follows.

Claims (1)

[Scope of utility model registration request] a first hour wheel to which an hour hand is attached, and a second hour wheel disposed concentrically overlapping the first hour wheel and engaged with the drive wheel train, and between the first and second hour wheels in the axial direction. A cam and a jump control lever that engage each other in the radial direction to form a slip mechanism are each positioned and fixed to one hour wheel, and the jump control lever is connected to a jump control part that engages with the cam, and a jump control lever that engages with the cam. It has a spring part extending on both sides of the control part, and a protrusion protruding in the axial direction at each end of the spring part, and the two protrusions play in a hole provided in one of the hour wheels. 1. A slip mechanism for a portable watch, characterized in that the first and second hour wheels are fitted into each other and are integrated with a bushing with a gap that allows mutual rotation.