JPH074628Y2 - Watch case structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a case structure of a watch case in which a movement and a dial are attached to a one-piece case made of synthetic resin, and organic glass is welded and fixed to a case.

[Conventional technology]

The case structure of the conventional watch case, in which the movement and the dial are attached to the one-piece case made of synthetic resin and the organic glass is welded and fixed to the case, has a structure as shown in FIG. That is, in FIG. 4, 11 is a body, 12 is a dial, and 13
Is a cover glass and 14 is a movement. The two feet 12a brazed to the dial 12 are press-fitted into the holes in the main plate of the movement 14, the needle 16 is attached to the movement 14, the movement 14 is attached to the body 11, and the cover glass 13 is attached to the dial 12
Was welded and fixed at a position in contact with the upper surface of the.

[Problems to be solved by the invention]

However, the above-mentioned conventional technique has a problem that ultrasonic vibrations at the time of welding the cover glass are directly transmitted to the movement through the dial plate, the quartz oscillator of the movement is broken, and the timepiece stops.

Therefore, the present invention solves such a problem, and an object thereof is to provide a glass-welded timepiece case of a one-piece case which does not cause the timepiece to stop and is price competitive.

[Means for solving problems]

The watch case structure of the present invention is a watch case structure in which a movement and a dial are attached to a one-piece case in which a case back and a body are integrally made of synthetic resin, and organic glass is ultrasonically welded and fixed to the case. It is a dial without feet made of material,
The dial has an inner diameter portion of the barrel and a fastening margin and is fixed to the barrel by the fastening margin, and the organic glass has a gap between the organic glass lower surface and the dial upper surface. .

〔Example〕

The present invention will be described with reference to FIGS. 1, 2 and 3.

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, in which the horizontal positioning of the timepiece dial 2 is carried out by the barrel 1, and the inner shape 1a of the barrel is the outer shape of the dial 2. The microprojection 1b having a portion 2a and a tightening margin is provided at three or more places.

The movement 4 is a protrusion of the body 1 made of plastic.
It is welded and fixed at several points at 1c. The back cover 1u is formed integrally with the body 1.

The cover glass 3 is fixed to the body 1 by ultrasonic welding,
When ultrasonic vibrations are transmitted to the dial 2 during welding and fixing, play A is prevented in order to prevent the crystal oscillator of the movement 4 from breaking through the dial 2 and the top surface coating of the dial 2 from peeling off. Need to be open. 1b is a small protrusion provided on the in-body shape 1a part.
mm-0.3 mm, the tightening margin is set when assembled, and the minute projections 1b made of plastic are scraped by the tightening margin that exceeds the elastic deformation of each part.
Even if there is dimensional variation in the 2a portion and the in-body shapes 1a and 1b portions, there is no play.

Materials such as aluminum and brass are suitable as the dial material. Also, as the case material, a plastic material such as ABS or polycarbonate is suitable.

FIG. 2 is an enlarged view around the dial plate fixing portion of FIG. 1, and the slope 1d is a guide slope for facilitating the incorporation of the dial 2.

Positioning of the dial 2 in the rotational direction is performed by a notch 2b portion provided on the dial outer shape 2a and a dial rotation stopper protrusion 1e provided on the body shape 1a portion.
When the dial 2 is guided by the rotation stopper protrusion 1e higher than the minute protrusion 1b of the body, the character of the dial 2 can be set in the rotational direction before the horizontal play is prevented. The board can be easily assembled.

FIG. 3 is a plan view showing a planar positional relationship between the inner shape 1a of the body 1 and the dial outer shape 2a before the dial is assembled.

Further, the assembly order is as follows: the body 1, the movement 4, the hour wheel 5, the dial 2, the hour hand 6, the minute hand 7, the second hand 8 and the cover glass 3. The hour wheel 5 always needs a force that is pressed against the movement 4 side in order to secure the amount of engagement with the wheel and wheel that transmits force to the hour wheel 5, and the force is a needle wheel or a hour wheel made of plastic. By the spring part 5a integrated with the. Conversely, until the cover glass 3 is assembled, the dial 2 always receives a lifting force on the lower surface, and it is difficult to attach the needle as it is. Especially in automatic assembly, the dial position is automatically adjusted from the upper surface of the dial 2. Since the height is detected, it is difficult to attach the needle. Therefore, the minute projections 1b play an important role of preventing the dial 2 from rising until the cover glass 3 is assembled by frictional resistance with the dial outer shape 2a.

The ultrasonic vibration necessary for welding the cover glass is transmitted from the upper surface side of the cover glass. Therefore, since the vibration energy is transmitted from the portion which comes into contact with the cover glass, the body 1 first begins to melt, and when the cover glass 3 comes into contact with the dial 2, the dial 2 is a metal, so the vibration energy does not melt and moves to the movement 4. Will serve to convey. Therefore, in the present invention, the gap A is provided between the lower surface of the glass and the dial sandwiched between the movement, and the amount of A is 0.01 mm or more in order to prevent the vibration from being transmitted. To 0.3 mm or less is preferable.

[Effect of device]

As described above, according to the present invention, the following effects can be obtained. The outer periphery of the dial and the inner diameter of the body have a margin,
Since the dial is fixed in the body only by this interference, the dial without legs can be assembled by throwing it into the body from above in the state of a single item. That is, it is possible to cope with a fully automatic assembly in which parts are successively thrown into the body from above and assembly is performed, whereby a significant reduction in assembly cost can be achieved.

Also, since the outer peripheral part of the dial is fixed in the body by the interference,
Even if there is some variation in the dimensional accuracy of the dial, the dial can be securely fixed. In addition, since the fixing force of the dial is increased, the dial is prevented from coming off due to ultrasonic vibration during welding of the cover glass or impact from the outside.

Furthermore, by providing a gap between the dial and the cover glass, it is possible to prevent ultrasonic vibration during welding of the cover glass from being directly transmitted to the dial. Therefore, the vibration at the time of welding is transmitted to the dial and the movement, and the coating of the dial is not peeled off, the crystal oscillator is not broken, and the watch dial part of the movement is not stuck.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a watch case structure of the present invention. FIG. 2 is an enlarged view around the dial plate fixing portion of FIG.
FIG. 3 is a plan view showing a planar positional relationship before the dial plate is assembled in the case. FIG. 4 is a sectional view of an essential part showing a conventional watch case structure. 1 …… Body 1b …… Small protrusion 2 …… Dial plate A …… Play 3 …… Cover glass 4 …… Movement

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic data Sho 53-56864 (JP, U) Real development Sho 52-76361 (JP, U) Real development Sho 52-89149 (JP, U) Real development Sho 52- 26573 (JP, U) Actual development 54-102053 (JP, U) Actual public 50-17400 (JP, Y1) Actual public 37-22184 (JP, Y1) Actual public 36-3790 (JP, Y1)

Claims (1)

[Scope of utility model registration request] 1. A watch case structure in which a movement and a dial are attached to a one-piece case in which a case back and a body are integrally made of synthetic resin, and organic glass is ultrasonically welded and fixed to the case. The dial is made of a metal material. It is a dial without legs,
The dial has an inner diameter portion of the barrel and a fastening margin and is fixed to the barrel by the fastening margin, and the organic glass has a gap between the organic glass lower surface and the dial upper surface. Watch case structure.