JPS5918385Y2 - Clock train structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timepiece, particularly to a wheel train structure for a three-hand timepiece equipped with a battery.

Electronic clocks (crystal clocks) have been well-received in the market due to their high accuracy, and in recent years, they have become smaller and thinner, and many of them have excellent designs.

However, for women's watches, it has not yet reached the level of conventional small mechanical watches.

This is largely due to the difference in the diameter and thickness of the power source, the barrel, and the battery between mechanical and battery-powered models.

That is, in a three-hand watch, the movement size is determined by the size and arrangement of the battery (or barrel) and second hand wheel.

This invention aims to downsize the movement by placing the second hand gear on the underside of the shoulder of the battery, thereby placing the battery near the center of the movement.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing a conventional wheel train structure.

This shows the gear train of a commonly used three-hand watch.

The third wheel, which is the minute wheel, is inserted into the second axle shaft 3 through a bearing 2 pushed into the main plate 1, and is supported by the handle frame 6 of the second bridge 5, which is an intermediate bearing.

The second gear 4 is fixed to the second axle.

The fourth wheel, which is the second hand wheel, has the shaft portion 7a of the fourth pinion 7 inserted into the pipe portion 3a of the second axle 3, and is supported by the bearing 10 of the third wheel bearing 9.

13 is the fifth wheel, 14 is the step motor rotor, 1
5 is the third wheel, 11 is the tsutsukana, and 12 is the hour wheel.

That is, the rotation of the rotor 14 is transmitted via the fifth wheel 13 to the fourth wheel (to the second hand), further via the third wheel to the minute hand, and then to the hour hand.

This structure is well known and detailed explanation will be omitted, but
Paying attention to the relationship between the battery 16 and the fourth gear 8, the height position of the fourth gear is approximately at the center of the height of the battery.

Therefore, the battery needs to be flush with the fourth gear.A
, the outer diameter of the fourth gear is B and the outer diameter of the battery is C, then the outer diameter D1 of the movement including the battery portion is expressed as 2 (B/2+A0C).

The present invention attempts to reduce this D1 dimension without changing the thickness.

One way to reduce Dl is to make the fourth gear smaller, but in general, in the case of a quartz watch, the second hand moves in 1-second steps, so the most preferable number of teeth is 60.
In order to reduce the outer diameter, the module must be made smaller, and there is a manufacturing limit to this, and the number of teeth must be reduced to 30.
When the number of pieces is reduced, the second hand has a disadvantage that the second hand fluctuates more when moving the hands.

The present invention is an attempt to achieve this objective without forcibly reducing the diameter of the fourth gear.

The invention will be explained with reference to FIG.

The second axle 3 is inserted into the bearing 2 of the main plate 1, and the fourth wheel is
The shaft portion 7a and pipe portion 7b of the fourth pinion 7 are inserted while being guided by the pipe inner surface portion 3a and upper housing portion 3b of the second axle 3, respectively.

A fourth gear 8 is fixed to the outer periphery of the pipe portion of the fourth pinion.

Furthermore, it is supported and positioned by the bearing 6 of the second bearing 5, and is supported and supported by the bearing 10 of the third bearing 9.

Therefore, the second axle 3 is supported by the base plate at the lower end and the No. 4 pinion pipe at the upper end.

The second gear 4 is used to lower the fourth gear 8 as much as possible.
Fix it to the second axle from the back side of the main plate.

The torque transmission path from the rotor 14 is the same as that shown in FIG. It is supported by a bearing and a third bearing.

Again, looking at the relationship between the fourth gear 8 and the battery 16, the fourth gear is located on the lower surface of the battery shoulder [the rounded part formed by the joint between the battery case (10 poles) and the lid (1 pole)]. Therefore, even if the gap A is secured as in FIG. 1, it is possible to intersect by E in a plane.

That is, this movement outer diameter D2 is the fourth gear outer diameter B,
If the outer diameter of the battery is C, it is expressed as D2-2 (B/2+C-E), and when compared with Dl in FIG. 1, it is possible to reduce the diameter by 2 (A+E).

The present invention is as described above, and by supporting the third wheel with a part of the fourth wheel (the inner surface of the fourth pinion pipe), the fourth gear is lowered to a position close to the main plate on the second bearing surface side. It becomes possible to partially intersect the battery in a plane, and this is a distant relative of the purpose of the present invention, which is to miniaturize the movement.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional wheel train structure. FIG. 2 is a sectional view showing an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] A battery is used in which one pole is formed on the lid part, the other pole is formed on the linear part, and has a shoulder part made of a curved surface from the outer periphery of the linear part to the lid part, and the battery has the shoulder part formed on the base plate. In the wheel train structure of a watch, the fourth wheel is placed between the third and second bridges and is integral with the shaft, and the second wheel is fixed to the lower end of the fourth pinion. It has a pipe part that is pivotally supported through the bridge, and a fourth gear fixed to the lower part of the pipe part and arranged between the second bridge and the main plate, and the third wheel is arranged on the back side of the main plate. and a second axle having a hole through which a fourth axle passes, and one end of the second axle passes through the main plate and is pivotally supported on the inner periphery of the pipe part. A wheel train structure for a timepiece, characterized in that the shoulder portion of the battery and the fourth gear are arranged in an overlapping manner.