JP2649649B2 - Timepiece resin member and its fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin member for a timepiece and a structure for fixing the same, and more specifically, a resin member for a timepiece suitable for fixing a stem receiving portion near a foot hole of a dial and a fixing structure therefor. It is related to the improvement of.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional winding stem in the vicinity of a dial foot hole of a wristwatch and a structure for fixing the winding stem. As shown in the figure, a stator 3, a magnetic core 4, a spacer 5, and a metal receiving member 6 are sequentially superposed and positioned by a screw pipe 8 press-fitted and fixed to a metal base plate 2. Then, the cross-sectional position of the receiving member 6 is determined by screwing and fixing the screw 9. At this time, a winding stem 7 made of resin is provided between the main plate 2 and the receiving member 6.

[0003] The winding stem 7 is provided with a plurality (one in the figure) of foot holes 10 into which the feet 1a of the dial 1 are inserted. The diameter of the foot hole 10 is set smaller than the dial foot 1a. The dial 1 is wound around the dial foot 1a 7
Is fixed to the base plate 2 side by press-fitting and fixing to the foot hole portion 10 of the base plate 2.

[0004]

However, in such a winding stem and its fixing structure, the cross-sectional position of the receiving member 6, particularly the vertical position in FIG. It is determined by the lamination height of certain parts 3 to 5 and not by the part of the winding stem 7 where the foot hole 10 of the dial 1 is located. For this reason, depending on the quality of the winding stem 7 and other parts 3 to 5 (particularly the thickness), a gap ΔA is generated between the receiving member 6 and the winding stem 7 as shown in FIG. .

If the dial foot 1a is pressed into the foot hole 10 in this state, the winding stem 7 is deformed as shown by an arrow in FIG. For this reason, when the pressing of the dial 1 is stopped, the winding stem 7 returns as shown by an arrow in FIG. 2B, and as a result, the dial 1 floats on the main plate 2. . In the example shown in the figure, the dial 1 is floating by ΔB above the surface of the main plate 2.

Further, depending on the quality of the winding stem 7 and other parts 3 to 5, as shown in FIG. 6, the receiving member 6 and the winding stem 7 overlap in the vertical direction in FIG. Member 6
, A warp of ΔC as shown by a dotted line occurs. For this reason, there arises an inconvenience of affecting the opening of the wheel train (not shown) supported by the receiving member 6. The present invention focuses on these points, regardless of the quality of the parts, and the resin member of the timepiece that can prevent the lifting of the dial when mounting the dial foot and the warpage during the assembly of the receiving member, It is an object to provide the fixing structure.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a timepiece movement including a metal base plate, a resin member, for example, a winding stem, and a metal receiving member. , Characterized in that several protrusions are provided on the winding stem. These projections are crushed while abutting on the base plate or the receiving member during assembly. As a result, the winding stem can be securely fixed without being affected by the size of the gap between the winding stem and the receiving member, which is determined by the appearance of other components between the main plate and the receiving member. According to the present invention,
For example, the dial foot for fixing the dial is pressed into the resin member.
Foot holes are formed for
The protrusion is provided near the hole. This allows the character
Depending on the clearance with the receiving member when attaching the plate foot to the resin member
Because the resin member does not deform,
Floating of the dial is reliably prevented.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a timepiece according to an embodiment of the present invention; Note that the same reference numerals are used for the same components as those of the above-described related art or components corresponding to the related art.

FIG. 1 shows a cross section of an embodiment of the present invention. In the figure, a screw pipe 8 is press-fitted and fixed to the base plate 2 from the lower side of the figure. A stator 3, a magnetic core 4, a spacer 5, and a receiving member 6 are sequentially stacked on the screw pipe 8 from above in the figure. By screwing a screw 9 to the screw pipe 8, they are fastened and fixed. Structure. Further, between the main plate 2 and the receiving member 6, a resin winding stem 7 having a foot hole 10 is provided. The dial 1 provided on the lower side of the figure is provided with a dial foot 1a, and the dial 1 is fixed to the base plate 2 side by press-fitting the dial foot 1a into the foot hole 10 of the winding stem 7. Has become.

Further, in this embodiment, several projections 7a (two in the drawing) are provided on the winding stem receiver 7, that is, on the receiving member 6 side. Each of the protrusions 7a is provided with a crushing margin 7b at the top thereof, and the overall size is slightly higher than that at the time of assembly.

Next, the operation of this embodiment will be described with reference to FIG. The stator 3, the magnetic core 4, and the spacer 5 are sequentially stacked on the screw pipe 8 press-fitted and fixed to the base plate 2. In a predetermined space on the main plate 2, a winding stem 7 made of resin is provided. Then, the receiving member 6 is further stacked on the spacer 5 and the winding stem 7 through the screw pipe 8.

FIG. 2 shows this state. As described above, since the protrusions 7a are provided at several positions on the winding stem 7, the receiving member 6 is supported by the protrusions 7a.

When the screw 9 is screwed into the screw pipe 8 in this state, the receiving member 6 is pushed down as shown by the arrow in FIG. 2, and the members 3 to 6 are tightened and fixed on one hand. Thereby, the cross-sectional position of the receiving member 6 is determined. On the other hand,
On the winding receiving side, the squeezing margin 7b of the projection 7a is made of resin.
Are crushed by the fastening of the receiving member 6, and the receiving member 6 and the projection 7
a overlaps and comes into close contact with each other. Therefore, inconveniences such as deformation of the receiving member 6 such as warpage at the time of assembling and generation of a gap between the receiving member 6 and the projection 7a of the winding stem receiver 7 can be satisfactorily prevented. Also,
Inconveniences such as affecting the opening of a train (not shown) supported by the receiving member 6 are also prevented.

Next, in this state, the dial foot 1a is wound with the winding stem 7a.
5A, the deformation of the winding stem 7 as shown by the arrow in FIG. 5A does not occur due to the presence of the projection 7a.
Stuffed into. Therefore, there is no return of the dial 1 as indicated by the arrow in FIG. 9B, and no lifting of the dial 1 indicated by ΔB occurs.

As described above, according to the present embodiment, several projections 7a are provided near the foot hole 10 of the winding stem 7 and the crushing margin 7b at the top thereof is crushed while contacting the receiving member 6. This has the following effects. The winding stem 7 can be securely fixed without being affected by the size of the gap between the winding stem 7 and the receiving member 6 caused by the workmanship (dimensional accuracy) of each part, and the dial after the press-fitting of the dial foot 1a. 1 can be prevented from floating. Deformation such as warpage of the receiving member 6 can be prevented, and the amount of change of the wheel train can be suppressed. Workmanship of parts stacked on each other (dimension variation)
The gap formed between the receiving member 6 and the winding stem 7 formed by the
Since the top portion is absorbed by being crushed, the quality and dimensions of each part may be rougher than in the past, and the production efficiency is significantly improved by not requiring high dimensional accuracy.

The present invention is not limited to the above-described embodiment, but includes, for example, the following. (1) In the above-described embodiment, the present invention is applied to the portion of the winding stem made of resin. However, the present invention can be applied to other portions having the same structure, and the same effect can be obtained. Can be
Further, the shapes and dimensions of the respective parts shown in the drawings may be appropriately changed as necessary. (2) In the above embodiment, the protrusion 7
Although a is provided, it may be provided on the base plate 2 side,
It may be provided on both sides of the main plate 1 and the receiving member 6. (3) The present invention is preferably applied to a wristwatch, but can also be used for various portable small watches such as a pocket watch.

[0017]

As described above, the resin member of the timepiece according to the present invention and the fixing structure therefor have the following effects. (1) A protrusion is provided on the resin member fixed between the base plate and the receiving member, and a crushing margin at the top is crushed. The resin member can be securely fixed without being affected by the size of the gap. (2) Press the dial foot for fixing the dial to the resin member.
And a plurality of foot holes for
Since the protrusion is provided near the hole, the dial
When attaching the foot to the resin member, the tree due to the clearance with the receiving member
No deformation of the grease member occurs. For this reason, when returning the resin member
The lifting of the dial due to this is reliably prevented. (3) Deformation such as warpage of the receiving member can be prevented,
The amount of change in the wheel train is suppressed. (4) The dimensional accuracy of each part does not have to be as high as in the past,
Production efficiency is greatly improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a main cross-sectional view showing a state before fixing a receiving member in the embodiment.

FIG. 3 is a sectional view showing the structure of a winding stem receiving portion of a conventional timepiece.

FIG. 4 is a cross-sectional view showing a case where a gap is formed between a winding stem receiver and a receiving member in the conventional example.

FIG. 5 is a main cross-sectional view showing how the dial is attached in the case of FIG. 4;

FIG. 6 is a cross-sectional view showing a case where a winding stem and a receiving member in the conventional example overlap each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dial 1a ... Dial foot 2 ... Ground plate 3 ... Stator 4 ... Magnetic core 5 ... Spacer 6 ... Receiving member 7 ... Winding true receiving 7a ... Winding true receiving projection 7b ... Crushing margin of projection top 8 ... Screw pipe 9 ... Screw 10: Foot hole portion ΔA: Gap ΔB: Lifting of dial plate ΔC: Warpage of receiving member

Claims (4)

(57) [Claims] 1. A fixing device sandwiched between a main plate and a receiving member.
In the resin member of the watch, The top of the crushing margin that is crushed by contact with the main plate or receiving member
At least one of the base plate side and the receiving member side
To form multiple A foot hole for press-fitting the dial foot to fix the dial
Number forming, The projections are provided near these foot holes.
Timepiece resin member. 2. The timepiece resin member according to claim 1,
Sandwiched between the plate and the receiving member to fix the main plate and the receiving member.
When pressing, crush the margin of the protrusion and fix the resin member
A resin member fixing structure for a timepiece. 3. A resin member and a plate between the base plate and a receiving member.
The main plate, the plate member and the receiving member are screwed together.
3. The fixing device according to claim 2, wherein the fixing member is fixed by means.
A resin member fixing structure for a watch. 4. A winding stem is formed by the resin member.
The timepiece resin member according to claim 2 or 3, wherein
Construction.