JPS6130224Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a train wheel structure of a timepiece and a structure for maintaining the posture of the train wheel. More specifically, the present invention provides a means for simultaneously achieving downsizing of the wheel train and maintaining the posture of the wheel train to facilitate assembly.

In the case of battery watches, especially small watches,
The outer diameter of the movement is often determined by the diameter of the battery and the size of the wheel, which is located in the center of the movement and cannot overlap with the battery. Therefore, in order to downsize the movement, the gear train,
In particular, it is necessary to make the car located in the center (for example, the fourth wheel) smaller. Furthermore, as the wheel train becomes smaller, it becomes more difficult to assemble, and at the same time, a more reliable and simple structure for maintaining the posture of the wheel train is required.

In the conventional wheel train structure, as shown in FIGS. 1 and 2, the outer periphery of the second bridge 2 is arranged so as to extend from the outer periphery of the stator 1, and the shaft portion 3a of the fifth wheel 3 of the second bridge 2 When the posture holding part 2b is provided, which supports the
Since the shaft portion 3a of the fifth wheel 3 separates from the rotor 6,
As a result, the outer diameter of the fourth wheel becomes larger, and since it is impossible to overlap the battery 5, the outer diameter of the movement of the battery section becomes larger. In addition, in order to reduce the outer diameter of the fourth wheel, as shown in Figure 3,
Although it is also possible to arrange the stator 1 and the stator 1 in a polymerized manner,
The movement becomes thicker and it becomes difficult to maintain posture.

The present invention aims to improve the above-mentioned drawbacks and provide a wheel train structure that is compact and easy to assemble.

The present invention will be explained below with reference to FIGS. 4, 5, and 6. In FIG. 4, a fifth wheel axle 3a is arranged in a notch part 1a on the outer periphery of an integral stator 1 having a hollow part 1b, thereby reducing the distance between the fifth wheel and the rotor, and This is intended to maintain the attitude of the fifth wheel with an attitude holding portion 10 formed in the form of a substantially through hole. The rotor 6, fifth wheel & pinion 3, and fourth wheel & pinion 4 are pivotally supported by a train wheel bridge 9. The notch portion 1a on the outer periphery of the stator is in principle always located at the position closest to the rotor on the outer periphery, and the distance between the fifth wheel & pinion 3 and the rotor 6 can be made sufficiently small. Therefore, the diameter of the fourth wheel & pinion 4 can also be reduced, making it possible to reduce the outer diameter of the movement. In addition, the notch part 1 of the stator
Since the shape of a is strictly suppressed for motor performance, the distance from the shaft part 3a of the fifth wheel 3 can be kept small, suppressing the inclination of the wheel train during assembly and improving assembly efficiency. be able to. FIG. 5 shows an example of a case where a notch 2a is provided on the second receiving side, and a substantially penetrating posture holding portion 1 obtained by bringing the notch 2 and the outer periphery of the stator 1 close to each other.
0 to maintain the posture of the fifth axle 3a. Compared to the conventional gear train structure, the one according to the present invention allows the position of the fifth wheel to be brought closer to the outer circumference of the stator, making effective use of the space near the outer circumference of the stator, which could not be used much with the conventional structure. be able to. Furthermore, since the stator and the second bridge do not overlap, it can be applied to thin watches, and costs can be reduced because no special posture-holding member is required. FIG. 6 is a sectional view of FIGS. 4 and 5 of the present invention.

As described above, according to the present invention, the wheel train of a battery-powered timepiece can be assembled easily and in a small space.

[Brief explanation of the drawing]

FIG. 1: A plan view of an example of a conventional wheel train structure. Second
Figure: Cross-sectional view of Figure 1 wheel train structure. Figure 3: Cross-sectional view of an example of a conventional wheel train structure. FIGS. 4 and 5: A plan view of an example of a wheel train structure according to the present invention. Figure 6: 4th
FIG. 5 is a sectional view of the wheel train structure shown in FIG. 1... Stator, 2... Second bridge, 1a... Notch part, 2a... Notch part, 3... Fifth wheel, 3a
...Axle of the fifth wheel, 4...Fourth wheel, 5...Battery,
6...Rotor, 7...Main plate, 8...Third wheel, 10
...Posture holding part.

Claims (1)

[Scope of utility model claims] A plate-shaped stator 1 placed on a base plate, a permanent magnet rotor 6 disposed in a hollow portion 1b provided in the plate-shaped stator and pivotally supported by a base plate 7 and a gear train bridge 9, and the permanent magnets. A clock train structure comprising a wheel train having a fifth wheel & pinion 3, a fourth wheel & pinion 4, and a second wheel & pinion 2 driven by a rotor and pivotally supported by the wheel train bridge, and a battery 5 juxtaposed with the fourth wheel & pinion. , the second bridge and the plate-shaped stator are arranged on substantially the same plane without overlapping each other in a plane, and
At least one of the plate-shaped stator and the second bridge
By arranging the notch portions 1a and 2a formed on one side close to each other around the other side, a substantially through hole-shaped attitude holding portion 10 is formed, and the fifth axle is passed through the attitude holding portion. The gear train structure of a watch is characterized by: