JP2540032Y2 - Mobile watch receiving member fixing structure - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention can be applied to portable watches such as watches and pocket watches. More specifically, in such a portable timepiece, the present invention relates to a receiving member fixing structure for inserting a reference pin into a reference hole of a receiving member such as a train wheel receiver, positioning the reference pin with the reference pin, and then fixing the receiving member with a set screw.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG. 10, for example, a train wheel bridge of a portable timepiece is provided with two reference holes 1a and 1b at an outer peripheral edge at positions separated from each other and adjacent to one reference hole 1a. And a screw insertion hole 1c is provided. One reference hole 1a is a round hole as shown in FIGS. 9 and 8, and the other reference hole 1b is a long hole as shown in FIG.

When the train wheel bridge 1 is mounted on a ground plate (not shown), the train wheel bridge 1 is placed on the ground plate, and the reference pins 2 and 3 are inserted into the reference holes 1a and 1b, respectively. Positioning the train wheel bridge 1 in 3 and then assembling by inserting the shaft tip of each gear incorporated on the main plate into a shaft hole (not shown) of the train wheel bridge 1 and then inserting the set screw 4 through the screw insertion hole 1c. Screw it onto the main plate and put the train wheel on it
Was fixed.

[0004]

[Problem to be solved by the invention] However, in the past,
For example, as shown in FIG. 7, since play is absolutely required between the reference hole 1 a and the reference pin 2, during automatic assembly, when the train wheel bridge 1 is assembled to the base plate and transported to the screwing step, an external When receiving the vibration from the gear train, the train wheel bridge 1 may come off, and there is a problem that the assemblability is poor.

Accordingly, an object of the present invention is to prevent the receiving member from being disengaged due to backlash between the reference hole and the reference pin in the portable timepiece after the mounting of the receiving member such as a train wheel support and before screwing. The purpose is to improve the assemblability.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention
For example, as shown in the following illustrated embodiment, reference pins 11 and 12 are inserted into reference holes 10b and 10c of a receiving member such as a train wheel bridge 10, and the positioning members 11 and 12 are used for positioning. Is fixed by a set screw 15, wherein a projection 10 f that is crushed when the reference pin 11 is inserted is provided on the inner surface of the reference hole 10 b.

[0007]

When mounting the receiving member, the train wheel bridge 1 is placed on the base plate, the reference pins 2.3 are respectively inserted into the reference holes 1a and 1b, and the train wheel bridge 1 is positioned by the reference pins 2.3. ,
Then, the tip of the shaft of each of the gears assembled on the base plate is inserted into a shaft hole (not shown) of the train wheel bridge 1 and assembled, and then a set screw 4 is screwed into the base plate through the screw insertion hole 1c, and the train wheel bridge 1 is inserted into the ground plate. Was fixed. The reference pins 11 and 12 are inserted into the reference holes 10b and 10c, respectively, and the train wheel bridge 10 is positioned by the reference pins 11 and 12. Then, the receiving member is pushed and assembled. At this time, the protrusion 10f hits the outer periphery of one of the reference pins 11 and is crushed.
Into the reference hole 10b in a press-fit state. After this assembling, the receiving member is fixed with the set screw 15.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a train wheel support provided with a receiving member fixing structure according to an embodiment of the present invention.
Reference numeral 10 in the drawing denotes a train wheel bridge (receiving member) of a wristwatch.
The train wheel bridge 10 is made of a resin material, one surface 10a is formed in an uneven shape, and two reference holes 10b and 10c are provided on the outer peripheral edge at positions separated from each other. A screw insertion hole 10d is provided adjacent to one reference hole 10b. In addition, although not shown, a plurality of shaft holes for receiving shaft tips of gears are provided on one surface 10a.

As shown in FIGS. 2 and 3, one reference hole 10b is formed in a substantially circular hole. In particular, three protrusions 10f projecting inward are formed at the upper edge of the inner surface in FIG. Do it. In the embodiment, the number is three, but may be two, or four or more. The projections 10f are minute with a height of about 0.03 mm. The other reference hole 1
0c is an elongated hole as shown in FIG.

Then, the above-described train wheel bridge 10 is attached to a main plate (not shown) by automatic assembly. In this case, first, the train wheel bridge 10 is put on the main plate, and the reference pins 11 and 12 on the main plate are respectively inserted into the reference holes 10b and 10c as shown in FIG.
And the train wheel bridge 10 is placed on the main plate and positioned.
Next, the tip of the shaft of each of the gears assembled on the main plate
0 is inserted into the shaft hole (not shown). Then, the train wheel bridge 10 is pushed, and as shown in FIG. 5, the reference pins 11 and 12 are pushed in to penetrate the reference holes 10b and 10c, respectively. At this time, the projection 10f hits the outer periphery of one of the reference pins 11 and is crushed, and the reference pin 11 is inserted into the reference hole 10b in a press-fit state. Then, the train wheel bridge 10 is assembled on the main plate so as not to come off even if it is subjected to vibration when it is transported to the next screwing step. Thereafter, as shown in FIG. 1, a set screw 15 is screwed into the base plate through the screw insertion hole 10d,
The train wheel bridge 10 is fixed to the main plate.

In the illustrated embodiment described above, the reference holes 10b and 10c for positioning and the screw insertion holes 10 for fixing are used.
Although d is provided at a separate position, for example, as shown in FIG. 6, such a reference hole and a screw hole may be provided at the same position.

In another embodiment, the tip 11a of the reference pin 11 is formed to have a small diameter to form the step 11b.
A screw hole 11c is formed in the tip 11a. And
When attaching the train wheel bridge 10, the tip 11a of the reference pin 11 is pressed into the reference hole 10b having the protrusion 10f,
The train wheel bridge 10 is placed on the step 11b and positioned. After the positioning, the reinforcing plate 20 is placed on the train wheel bridge 10, and the set screw 15 is screwed into the screw hole 11c through the hole 20a to fix the train wheel bridge 10.

[0013]

Therefore, according to the present invention, a dowel is provided on the inner surface of a reference hole of a receiving member such as a train wheel bridge, and when the reference pin is inserted into the reference hole, the projection is crushed and the reference pin is press-fitted. When mounting the receiving member, before assembling the receiving member and before screwing, prevent the receiving member from coming off due to backlash between the reference hole and the reference pin, and improve the assemblability. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view showing a receiving member fixing structure according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of a reference hole of the train wheel bridge.

FIG. 3 is a longitudinal sectional view of the reference hole.

FIG. 4 is a cross-sectional view showing a state where a reference pin is inserted into a reference hole when the train wheel receiving assembly is performed.

FIG. 5 is a cross-sectional view showing a state of a reference hole and a reference pin after the train wheel receiving assembly.

FIG. 6 is a sectional view showing a receiving member fixing structure according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a state of a reference hole and a reference pin at the time of assembling a train wheel receiver in a conventional receiving member fixing structure.

FIG. 8 is a longitudinal sectional view of the reference hole.

FIG. 9 is a plan view thereof.

FIG. 10 is a plan view showing the conventional receiving member fixing structure.

[Explanation of symbols]

 Reference Signs List 10 wheel train receiver (receiving member) 10b reference hole 10f projection 11 reference pin 15 set screw

Claims (1)

(57) [Scope of request for utility model registration] 1. A reference pin is inserted into a reference hole of a receiving member,
In a receiving member fixing structure for a portable timepiece in which the positioning member is positioned with the reference pin and then the receiving member is fixed with a set screw, a projection that is crushed when the reference pin is inserted is provided on an inner surface of the reference hole. Receiving member fixing structure.