JPS6324462Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fixing structure between a dial and a movement in a portable watch.

[Conventional technology]

The conventional method is shown in FIGS. 1 and 2. Conventionally, as shown in FIG. 1, two dial feet 11a fixed to the dial 11 by brazing or welding are press-fitted into holes in a plastic member of the movement 12 with a tightness, and the plastic member is The dial is held in place by the frictional force between the dial and the dial feet. Also, as shown in Figure 2, the dial 2 is similar to the case in Figure 1.
The dial set screw 23 is screwed into a screw hole provided in the movement 22 from the side of the dial leg 21a fixed to the dial 1, and the dial is fixed to the movement by the lateral pressure of the screw.

[Problem that the invention attempts to solve]

However, with the above structure, it is difficult to achieve positional accuracy of the dial feet relative to the dial plate when fixing the dial feet to the dial plate, and the dial feet tend to bend after being fixed to the dial plate, so that sufficient characters cannot be secured. The relative positional accuracy between the plate and the movement cannot be obtained, and furthermore, the first
In the structure shown in the figure, the fixing force of the dial plate cannot be secured sufficiently due to creep of the plastic parts or lack of tightening margin due to variations in component dimensions, and in the structure shown in Fig. 2, the screws loosen due to drops and vibrations. This had the problem that the fixing force of the plate was reduced.

The purpose of this invention is to provide a fixing structure for the dial and movement that has good positional accuracy between the dial and movement, is highly reliable against external disturbances such as vibrations and drops, and has an improved appearance of the dial fixing part. It is in.

[Means for solving problems]

The fixing structure of the dial on the mobile watch side according to the present invention is as follows:
A plurality of dial set screws, a plurality of dial positioning holes near the outer periphery, and a plurality of dial set screw holes each having a large diameter portion formed deeper than the height of the head of the dial set screw at the tip. A dial plate made of an integral plate material with a hole, and a dial positioning pin is erected at a position on the front side corresponding to the dial positioning hole so that the protruding height is smaller than the thickness of the dial plate, and A movement in which a female thread is formed at a position on the front side corresponding to the dial plate set screw hole, and the dial plate arranged on the front side is fixed by the dial plate set screw, and the dial positioning pin and the dial plate set screw are covered. It has a dial ring arranged on the surface of the outer periphery of the dial ring as shown in FIG. The dial fixing screw holes are each formed at a symmetrical position with respect to the center of the dial.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.
Fig. 4 is a cross-sectional view of the main part. As shown in these figures, two or more dial positioning holes 31a and two or more dial set screw holes 31b are drilled near the outer periphery of a dial 31 made of a single disc-shaped member. The two dial positioning holes 31a are drilled at positions symmetrical with respect to the center of the dial 31, and the two dial set screw holes 31b are also drilled at positions symmetrical with respect to the center of the dial. The dial set screw holes 31b are formed with an enlarged diameter portion 31c with a depth D greater than the height H of the head 33a of the dial set screw 33.

On the other hand, the movement 54 to which this dial 31 is fixed has two or more dial positioning pins 32 at positions corresponding to the dial positioning holes 31a and with a height h that is smaller than the thickness T of the dial 31. Further, a female thread 54a into which the dial set screw 33 is screwed is cut at a position corresponding to the dial set screw hole 31b.

Furthermore, as is clear from FIG. 4, the diameter d ₁ of the dial positioning hole and the diameter d ₂ of the dial positioning pin 32 are
The amount of play between the dial positioning hole 31a and the dial positioning pin 32, which is the difference between the dial positioning hole 31a and the dial positioning pin ₃₂ , is set to be smaller than the difference between the inner diameter d3 of the dial set screw hole 31b and the thread diameter _d4 of the dial set screw 33. has been done.

Therefore, when fixing the dial 31 to the movement 54, first align the dial positioning hole 31a with the dial positioning pin 32, and then
After setting the two or more dial set screws 33
By tightening the dial 31, the dial 31 is securely fixed to the movement 54.

Then, as shown in FIG. 5, the dial ring 52 is placed on the dial 31 to cover the dial fixing screw hole 31b and the dial positioning hole 31a of the dial 31 fixed to the movement 54. Further, the front side of the dial ring 52 is in contact with a member 54 fixed to the outer body 53.

[Effect of idea]

In this invention, the dial is positioned using dial positioning pins set on the movement, and this dial is fixed to the movement from the dial surface side using dial set screws. The holes are drilled at symmetrical positions with respect to the center of the dial, and the positioning accuracy of the dial positioning holes is determined by the press punching accuracy of the dial raw material, so it is extremely high. Since this can be done using the dial positioning holes drilled at symmetrical positions with respect to the center as a reference, it is possible to secure the scale position of the dial with high precision with respect to the movement, that is, the pointer position. Therefore, the present structure is particularly effective for watches with a stopwatch function that require particularly high precision of the hands.

In addition, the dial is fixed directly to the movement using dial set screws at symmetrical positions with respect to its center, and the front side of the dial ring placed on the front side of the dial is in contact with a member placed on the outer body. Since the dial ring is in contact with the dial ring and prevents it from being displaced or deformed upward, even if mechanical disturbances such as vibration or impact are applied, the dial ring will not come off from the movement or become deformed. , an extremely reliable dial fixing structure was achieved.

Furthermore, the dial is shaped like a single plate, and the dial set screws and dial positioning pins are placed only near its outer periphery, and these are covered by the dial ring, allowing for good display without spoiling the appearance. You can get an external view of the part.

The protruding height of the dial positioning pin is smaller than the dial thickness, and the depth of the large diameter portion of the dial set screw hole is larger than the height of the head of the dial set screw. Since the dial set screws do not protrude from the upper surface of the dial, the lower surface of the dial ring hits their tips and prevents the dial ring from deforming due to impact or the like. Moreover, since there is no gap between the dial ring and the dial surface, there is no wasted space in the thickness direction, making it possible to create a thin watch.

[Brief explanation of drawings]

Fig. 1: A sectional view showing the conventional embodiment; Fig. 2: A sectional view showing the conventional embodiment; Fig. 3: A plan view showing the embodiment of the present invention; Fig. 4: A partial sectional view showing the embodiment of the present invention. , FIG. 5 is an assembled sectional view of a watch using the present invention. 31...Dial board, 54...Movement, 33
...Dial plate set screw, 32...Dial positioning pin, 52...Dial ring.

Claims (1)

[Scope of Claim for Utility Model Registration] A plurality of dial set screws, a plurality of dial positioning holes near the outer periphery, and a large diameter portion formed deeper than the height of the head of the dial set screw at the tip. A dial plate is made of an integral plate material with a plurality of dial fixing screw holes, and a letter plate is provided at a position on the front side corresponding to the dial positioning hole so that the protruding height is smaller than the thickness of the dial plate. A movement in which a plate positioning pin is erected, a female thread is formed at a position on the front side corresponding to the dial plate fixing screw hole, and the dial plate arranged on the front side is fixed by the dial plate fixing screw, and the dial plate positioning pin. a dial ring disposed on the surface of the outer periphery of the dial so as to cover the dial set screw; and an outer body disposed with a member that abuts on the front side of the dial ring; A fixing structure for a dial of a portable watch, characterized in that the dial positioning hole and the plurality of dial fixing screw holes are each opened at a symmetrical position with respect to the center of the dial.