JPS6014230Y2 - Second wheel bearing structure for analog crystal watches - Google Patents

Description

[Detailed description of the invention] The present invention relates to an analog quartz watch, and the second wheel for an analog quartz watch is characterized in that the second wheel is guided by a ring-shaped projection provided at the center of the second upper handle frame. This relates to bearing structure.

The purpose of the present invention is to reduce parts costs by simplifying the machining process of the second upper handle frame in the second wheel bearing structure for analog quartz watches.

The conventional center wheel bearing structure for an analog quartz watch is as shown in FIG.

The center wheel 1 is guided by the inner diameter of the second upper handle frame 2.

FIG. 2 is a detailed view of the second upper handle frame 2 in the conventional structure.

The processing of the second upper handle frame 2 is done using an automatic lathe, and the cutting is shown in Figure 2A.
- Perform on the A' side.

This causes a burr in part a of FIG.

Since this burr interferes with the rotation of the fourth wheel & pinion 3, it is necessary to remove it.

This work is difficult to mechanize due to problems with processing accuracy, so it is currently done manually, which causes an increase in costs.

Therefore, it is desirable to cut along the plane B-B' in FIG. 2, but this is not easy in view of the shape and dimensions of the second upper handle frame 2 and the strength of the cutting tool.

The present invention eliminates the above drawbacks.

Its structure is shown in FIG.

The second upper handle frame 2' is supported by the second support 4, and the inner periphery of the cylindrical shaft portion of the second wheel & pinion 1' abuts as the outer periphery of the cylindrical protrusion 2'd of the second upper handle frame 2'. It is pivoted.

Further, the pinion portion of the fourth wheel & pinion 3 is in contact with the upper surface 2'e of the second upper handle frame.

The shaft of the fourth wheel is disposed so as to pass through the hollow part 2'f of the second upper handle frame 2' and the hollow part of the second wheel shaft.

Figure 4 shows that the second upper handle frame 2' in this structure has an engaging portion 2'a that engages with the second receiver and a flange portion 2 that contacts the second receiver surface.
'b is a lower surface recess 2'c1 where the number wheel axle is arranged; a cylindrical protrusion 2'd protruding from the lower surface recess; an upper surface 2'e1 where the pinion of the fourth wheel comes into contact; and a hollow part 2'f through which the fourth wheel axle passes. Consisting of

The cylindrical protrusion 2'd protrudes from the lower surface of the flange 2'b, and as shown in FIG. 3, the center wheel and pinion is pivotally supported by this cylindrical protrusion.

With this structure, the second upper handle frame 2' can be cut along the plane C-C' in FIG. 4 when processed using an automatic lathe.

As a result, a burr occurs in the lower part, but since there is a space between the second upper handle frame 2' and the fourth wheel 3, even if this burr exists, it will not interfere with the rotation of the fourth wheel. do not have.

Therefore, according to this structure, the manual burr removal process is omitted in the processing of the second upper handle frame 2', and the cost of parts can be reduced.

As described above, the present invention simplifies the processing process and reduces the cost of parts compared to the conventional structure, and has a very large effect on analog crystal watches.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing a conventional second wheel guide structure for an analog quartz watch, Fig. 2 is a detailed view of the second upper handle frame in the conventional structure, and Fig. 3 is a second wheel guide structure for an analog quartz watch according to the present invention. FIG. 4 is a partial cross-sectional view of the number wheel guide structure. FIG. 4 is a detailed view of the second upper handle frame in the present invention. In the diagram, the numbered parts names, 1, 1'...second wheel,
2.2'...second upper handle frame, 3...fourth wheel.

Claims (1)

[Scope of utility model registration request] The second wheel and the fourth wheel are arranged coaxially via the second wheel, and the rotating shaft is arranged to pass through the inner periphery of the cylindrical shaft part of the second wheel, and the upper handle of the second wheel is disposed coaxially. In a second wheel and pinion bearing structure for an analog quartz watch, the second wheel and pinion are pivotally supported by the second upper handle frame fixed to the second bridge, and the pinion of the fourth wheel is in contact with the upper surface of the second upper handle frame. The upper handle frame has an engaging part 2'a that engages with the second receiver, and a flange part 2'b1 that comes into contact with the second receiver surface.
A hollow portion 2'f through which the fourth wheel shaft passes; a lower recessed portion 2'C in which the second wheel shaft is disposed; a cylindrical protruding portion 2'd protruding from the lower recessed portion along the hollow portion 2'f; The cylindrical protruding portion 2'd is shaped such that its tip protrudes from the lower surface of the flange portion 2'b, and is shaped so that the tip of the cylindrical protruding portion 2'd protrudes from the lower surface of the flange portion 2'b. A second wheel bearing structure for an analog quartz watch, characterized in that the inner periphery of the second wheel and the outer periphery of the cylindrical protrusion 2'd of the second upper handle frame are brought into contact with each other to form a bearing for the second wheel.