JPS5822153Y2 - Watch back train support structure - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a back train support structure for a watch.

Conventionally, the back train (here we will talk about the back train).

) was supported by pulling out a pin 1a from the base plate 1 and using it as a rotating shaft, as shown in FIG.

However, as small watches become more popular and attempts are made to design smaller ones, the meshing center distance of the gear train becomes smaller, the tooth root diameter of the gears or pinions becomes smaller, and the pin diameter also becomes smaller. , Various problems occurred with the pull-out pins from the main plate.

One of these problems is that during processing of the base plate, the pins were frequently bent or broken, causing problems such as the pin position not being visible and the ability to guide the rear wheels.

As a countermeasure, as shown in Fig. 2, there is a handle hole in the main plate 1.
b was set up and guided by Hinuraguruma 2's v32a.

However, in this method, the gear meshing position is above the guide portion in cross section, and the guide length is short, so the dial wheel 2 tends to tilt, resulting in disengagement with the cylinder pinion or the like.

Further, as shown in FIG. 3, a steel axle 4 is machined into the base plate 1 and is driven into the base plate 1 for use.

Steel is used to provide strength against the forces applied when setting the needles.

Also, to prevent the rear axle 4 from tilting or coming off,
Increase the base plate driving diameter as much as possible.

In particular, in the layout of the movement design, if the hole wheel 5 of the front wheel train is located near the rear axle 4 as shown in Figure 3, and the position of the aroma wheel cannot be shifted, the hole wheel diameter will be changed.

You must set the diameter of the axle to an appropriate diameter and drive it in.

Moreover, since the remaining thickness of the base plate 1 is small, problems such as the position of the hole being shifted when punching the hole in the base plate, deviation when driving the hole stone 5 or the axle 40, and no pulling force being generated occur.

The present invention eliminates the above-mentioned drawbacks and provides a rear wheel train support structure that can be used even in small watches.

The present invention will be explained below with reference to the drawings.

In the present invention, explanation will be given using the example of the second bridge supporting the minute wheel as the bridge supporting the front gear train, and the hour wheel supporting the rear gear train.

As shown in Fig. 4, drive the rear axle 4 into the second bridge 3 that supports the minute wheel with tightness, and protrude the rear axle 4 from the hole 1b in the main plate into the nose gear train. This is a structure that guides the Hinohuraguruma 2.

The agaki of the Hinuraguruma 2 is determined by the Hinura pusher 6 and the main plate 1.

The diameter of the escape hole of the axle 4 on the main plate needs to be slightly larger than the guide diameter of the axle, so the smaller the diameter of the tooth bottom of the axle on the main plate, the better the conditions will be, and the remaining thickness of the main plate will be reduced. becomes larger.

In particular, the second pipe 3 must be accurately positioned using guide pins in order to determine the position of the minute wheel.

However, if the guide pin cannot be removed due to space, fill the gap between the rear axle 4 and the escape hole of the main plate 1, and
It is possible to guide you.

As described above, with the present invention, even if the diameter of the tooth bottom of the gear or pinion of the nose gear train becomes smaller and the diameter of the guide part becomes smaller,
It can be supported easily and accurately.

In the present invention, the explanation has been made regarding the Hinura-guruma, but the same applies to the Kotetsu 9-day transport car, etc., and the same effect can be obtained if it is a bridge that supports the front wheel train outside the second pick-up.

Therefore, according to the configuration of the present application, the shaft member that pivotally supports the nose ring train is planted on the receiving plate, penetrates the hole in the main plate and projects onto the back side of the main plate, and the shaft member and the hole in the main plate are brought close to each other. This has the following effects.

(a) Ideally, the shaft member installed on the support plate should be perpendicular to the base plate, but even if the shaft member is tilted due to manufacturing variations, according to this application, the shaft member is perpendicular to the base plate. Since the member and the hole in the base plate are close to each other in the radial direction, the direction is regulated and a state close to perpendicular to the base plate can be maintained at all times.

Further, unlike the conventional configuration in which pins are planted in the base plate, the hole diameter of the base plate does not need to be large, so deformation of the base plate during manufacturing can be almost prevented.

(b) When assembling a watch movement, the shaft member set on the back plate can be used as a guide pin to determine the relative position between the main plate and the back plate, improving the installation efficiency. There is also.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional embodiment, FIG. 2 is a cross-sectional view of a conventional embodiment, FIG. 3 is a cross-sectional view of a conventional embodiment, and FIG. 4 is a cross-sectional view of an embodiment of the present invention. 1...Main plate, 2...Tanouchuruma, 3...
...Second pipe, 4...Tanoucha axle, 5...
・Anaishi.

Claims (1)

[Claims for Utility Model Registration] A front wheel train, such as a minute wheel, third wheel, and fourth wheel, arranged on the surface of the main plate and pivotally supported between the main plate and the receiving plate, and a front wheel train, such as a minute wheel, third wheel, and fourth wheel, arranged on the back side of the main plate. The back car of the Kotetsu car on the 9th. In a wheel train structure consisting of a rear wheel train such as a date wheel, a shaft member serving as a rotating shaft of the rear wheel train is planted in the bridge, and the shaft member passes through a hole provided in the base plate. The shaft member is formed to protrude above the back surface of the main plate, and the diameter of the portion of the shaft member that passes through the main plate is necessarily smaller than the diameter of the gear train member on the back side of the main plate that is pivotally supported by the shaft member. A back wheel train support structure for a timepiece, characterized in that the shaft member and the hole in the base plate are provided close to each other in a radial direction.