JPH058489U - Fixed structure for watch parts - Google Patents

Abstract

(57) [Summary] [Objective] The present invention realizes fixing of components of a watch using a plastic base plate at a low cost. [Structure] A fixed shaft 3 having a long direction and a short direction is inserted into a long hole 1a of a plastic base plate 1 slightly larger than the fixed shaft 3 and rotated 90 degrees, and the main plate hole 1a is compressed and fixed to the fixed shaft 3. Give power. [Effect] With a simple-shaped fixed shaft and plastic base plate, a low-priced fixed structure can be realized, and the price of the watch move can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for fixing parts in a timepiece using a plastic base plate.

[0002]

[Prior Art]

 As a conventional fixing structure for watch parts, a fastening method using a set screw is widely used. This is a structure in which the components of the watch are fixed by fixing the screw tube to the main shaft member such as the main plate or by directly threading and fastening the set screw there.

Conventional techniques will be described below with reference to the drawings. FIG. 7 is a partial cross-sectional view showing a fixing structure with a set screw. In FIG. 7, 1 is a main plate, 12 is a screw tube fixed to the main plate 1, 2 is a pusher plate for supporting the components of the timepiece, and 11 is a set screw. The pusher plate 2 has a structure in which it is positioned and incorporated into the screw tube 12 and then fixed by screwing a set screw 11 to the screw tube 12.

Other methods include a structure in which a metal pressing plate having a hook portion is hooked and fixed to a plastic base plate or the like, or a boss of a base shaft member such as a plastic base plate is deformed by heat or the like. Recently, the caulking structure to be fixed has become commonly used.

In addition, a timepiece having a structure for fixing by a deformed fixed shaft formed of a plastic material has been realized. FIG. 8 is a partial sectional view showing the structure. In FIG. 8, 1 is a base plate, 2 is a pressing plate, and 13 is a fixed shaft molded of a plastic material. The fixed shaft 13 includes a cylindrical shaft portion 13a, a hook portion 13b protruding in one direction at its tip, and a brim portion 13c for holding the pressing plate 2. Further, the hole 1a of the main plate 1 has an elongated hole shape having a direction through which the hook portion 13b of the fixed shaft 13 can pass, and a sink portion 1d for hooking the fixed shaft hook portion 13b is formed on the lower surface side. . In this structure, a support member for a timepiece component such as a pusher plate 2 is placed on the main plate 1, and the fixed shaft 3 is placed in the main plate hole 1a, and the fixed shaft hook portion 13b and the main plate hole 1a are arranged in the long hole direction. Then, they are dropped together, and then a driver or the like is applied to the groove of the head of the fixed shaft collar portion 13c and rotated by about 90 degrees. At this time, the fixed shaft hook portion 13b is caught in the recessed portion 1d of the main plate hole 1a and hooked therein, so that the fixed shaft hook portion 13b cannot be pulled out in the vertical direction.

[0006]

[Problems to be solved by the device]

 However, in the case of a fixing structure with a set screw, the cost of parts increases because it is necessary to thread the base plate tube and the set screw. Also, in the case of assembly, especially when performing automatic assembly, it is necessary to have some skill and experience such as proper management of screw tightening torque and setting of a screw tightening jig for vertically tightening screws. Also, when using screws, it is difficult to reduce the move thickness of the watch because it is necessary to secure a certain length so that the screws will not be broken due to excessive tightening force.

[0007] Furthermore, in the fixing structure using hooks or the fixing structure using thermal caulking, it is possible to keep the cost low because no screws are used, but it is impossible to disassemble, or even if it can be disassembled. Since the parts are easily deformed by repeated assembly, repairs, overhauls, etc. are almost impossible.

In the fixing structure using the plastic fixed shaft 13 shown in FIG. 8, since there is no fixing force in the rotating direction of the fixed shaft 13, there is a possibility that the fixed shaft 13 may come off while the watch is carried, and the ground plate sinking part. It is considered that there is a slight problem in the fixing reliability, such as the pressing plate 2 cannot be securely fixed because a gap 14 is structurally generated in the vertical direction between the 1d and the fixed shaft hook portion 13b.

An object of the present invention is to solve the above problems and to provide a fixing structure for easily and reliably fixing a timepiece component at a low cost.

[0010]

[Means for Solving the Problems]

 The present invention for achieving the above object has the following configuration. That is, in an electronic timepiece using a plastic main plate, a shaft part having a long direction in one direction and a short direction in the vertical direction of the length direction, and a step having a diameter larger than the outer shape of the shaft part and a step with the shaft part. It has a fixed shaft consisting of a brim and a deformed hole that is slightly larger than the outer shape of the shaft of the fixed shaft, and is composed of a base plate molded of a plastic material. The dimension of the main plate hole in the short direction is set to be shorter than the dimension of the fixed shaft in the long direction, and the short part of the main plate hole is elastically deformed by the long part of the stop shaft, and fixed. It is configured to generate force.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial sectional view showing a fixing structure for a timepiece component according to a first embodiment of the present invention, FIG. 2 is a side view of a fixed shaft 3 used in the first embodiment of the present invention, and FIG. 3 is a first embodiment. It is the top view which looked at the fixed structure of an example from the lower surface side. Hereinafter, the first embodiment will be described with reference to FIGS. In the first embodiment, as an example of the present invention, an example using a fixing structure of a calendar portion of a timepiece is shown. In FIG. 1, reference numeral 1 is a base plate formed of a plastic material. As a kind of the plastic material, in order to have a strength as a base material of a timepiece and to have a fixing force by press-fitting the fixing shaft 3, a certain degree is required. A material that elastically deforms is desirable, and for example, a poly carbonate material, a poly phenylene sulfide material, a poly thio ether ether sulfone material, or the like may be used. Further, the main plate 1 is provided with a hole 1a for the fixed shaft 3 and a positioning boss 1b for the pressing plate 2. Reference numeral 2 is a pusher plate for holding the calendar parts with the main plate 1, reference numeral 4 is a date plate, and reference numeral 5 is a day wheel. Reference numeral 3 is a fixed shaft for fixing the main plate 1 and the pressing plate 2. The fixed shaft 3 may be formed of a plastic material, but it is preferable that the fixed shaft 3 is formed of a metal material in terms of strength and reliability of fixing.

The shape of the fixed shaft 3 will be described in detail with reference to FIG. 2A is a side view of the fixed shaft 3 as seen from the lateral direction of the shaft, and FIG. 2B is a rear view as seen from the direction of the tip of the shaft. In FIG. 2 (a), the fixed shaft 3 is composed of a cylindrical shaft portion 3a and a flange portion 3b formed at one end thereof, and the shaft portion 3a has cut surfaces 3c that are parallel to each other in a planar manner on both sides of the shaft. However, the width of both surfaces of the cut surface 3c is shorter than the outer diameter dimension of the portion of the shaft portion 3a without the cut surface. That is, in FIG. 2B, the axial width in the direction of arrow 6 which is the vertical direction of the arrow 7 is longer than the axial width of the shaft portion 3a in the direction of arrow 7. Further, the tip 3d of the shaft portion 3a has a slanted surface shape whose diameter is gradually reduced for guiding during assembly. The brim portion 3c has a disk shape having a larger diameter than the shaft portion 3a, and is provided with a groove 3e for rotating the fixed shaft 3 with a screwdriver or the like. As a normal machining method of the fixed shaft 3, a method of forming a cylindrical shaft by a lathe and the like and then cutting the cut surface 3c of the shaft is conceivable, but in order to reduce the processing cost, the shaft portion 3a is processed by the header processing. It is also possible to form the cylindrical shape, the cut surface 3c shape, and the brim portion 3b at the same time. In that case, although both sides of the shaft are cut in this embodiment, the shaft portion 3a can be formed in an elliptical shape having a long direction and a short length method.

In FIG. 1, a calendar plate such as a date dial 4 and a date indicator wheel 5 is positioned and held by a push plate 2 positioned on a main plate 1 and a main plate boss 1b. In this state, the elongated portion of the shaft portion 3a of the fixed shaft compresses the main plate hole 1a and elastically deforms it, thereby fixing the fixed shaft 3 to the main plate 1 in both the rotating direction and the pulling direction. At this time, the fixed shaft collar portion 3b presses and fixes the pusher plate 2 from above so that the calender component does not come off. The amount of compressive deformation of the main plate hole 1a varies depending on the material of the main plate 1, but it is preferable to set it to about 10 to 100 μm.

Next, the fixing structure of the fixed shaft 3 and the assembling method will be described again in detail with reference to FIG. In FIG. 3, (a) shows a state in which the fixed shaft 3 is inserted into the main plate hole 1a with the same shape, and (b) shows a state in which the fixed shaft 3 is rotated 90 degrees and fixed to the main plate 1. ing . In FIG. 3 (a), the main plate hole 1a is slightly larger than the axial shape of the fixed shaft 3 over the entire circumference, and like the fixed shaft 3, the shape of the hole has a long direction and a short direction. . In order to assemble the fixed shaft 3 into the main plate 1, first, the fixed shaft 3 is inserted into the main plate hole 1a by aligning the long axis direction and the short axis direction of the hole with the inclined surface of the tip 3d as a guide. At this time, since there is a slight gap 8 around the entire circumference between the fixed shaft 3 and the main plate hole 1a, the force for pushing the fixed shaft 3 is not necessary and it is sufficient to just drop it. After that, the screwdriver is aligned with the groove 3e of the fixed shaft collar portion 3b and rotated by 90 degrees. At that time, as shown in FIG. 3 (b), the longitudinal direction of the fixed shaft 3a is directed from the arrow 9 to the arrow 10, and the short direction of the main plate hole 1a is compressed and elastically deformed to generate a fixing force on the fixed shaft 3. . When disassembling, conversely, the fixed shaft 3 is rotated 90 degrees again to return the lengthwise direction of the fixed shaft 3a to the direction of the arrow 9 to release the elastically deformed portion of the main plate hole 1a and fix it. Remove the shaft 3. As described above, in this embodiment, it is only necessary to drop the fixed shaft 3 into the main plate hole 1a without rotating the shaft or pushing force unlike the screw tightening structure, and then rotate it by 90 degrees. Assembling workability is very good.

Next, the second and third embodiments will be described with reference to FIGS. 4 and 5. In the first embodiment, the fixed shaft 3 is fixed to the main plate hole 1a only by the compressive force due to the elastic deformation of the plastic main plate, so the impact resistance and the decrease in the fixing force due to the time-dependent deformation of the plastic main plate 1, etc. , There are some concerns about fixed reliability. Therefore, in the second and third embodiments, the structure for improving the reliability of the fixing force is adopted. In FIG. 4, as in the first embodiment, 1 is a base plate, 2 is a pressing plate, and 3 is a fixed shaft. However, a slit is made in the peripheral portion of the bottom surface side of the hole 1a of the base plate 1 so that the thin portion 1c is formed. Has formed. When the base plate hole 1a is compressed in the longitudinal direction of the fixed shaft 3, the base plate thin portion 1c is elastically deformed when a compressive force is applied from the fixed shaft 3a due to its thin wall, as compared with the shape of the base plate hole of the first embodiment. This is advantageous for the plastic deformation of the main plate hole 1a due to the deterioration of the fixing force over time and the repeated disassembly and assembly.

FIG. 5 shows a third embodiment of the present invention. In FIG. 5, 1 is a base plate, 2 is a pressing plate, and 3 is a fixed shaft, but the tip portion of the shaft portion 3a of the fixed shaft 3 has a tapered shape in which the tip portion is slightly thicker than the root portion. When the fixed shaft 3 is incorporated in the main plate hole 1a, the main plate hole 1a is compressed by the fixed shaft portion 3a, but the tapered shape of the fixed shaft 3a causes the main plate hole 1a to be elastically deformed more on the lower surface side than on the upper surface side. ing. Therefore, the hole diameter on the upper surface side of the main plate hole 1a is smaller than that on the lower surface side, so that the fixed shaft 3 has a shape that is difficult to pull out when a force for pulling it from the main plate 1 acts.

Further, as a fifth embodiment of the present invention, a fixing method using a fixed shaft having an eccentric brim will be described. FIG. 6 is a partial sectional view showing the fifth embodiment. In FIG. 6, 1 is a base plate, 2 is a pressing plate, 3 is a fixed shaft, and the shaft portion 3a of the fixed shaft 3 has a long-side direction and a short-side direction as in the above-described embodiments. The portion 3b has an eccentric structure in which the central axis is deviated from the shaft portion 3a, and a slope 3f is formed in the shaft portion 3a direction. Next, a fixing method according to this embodiment will be described. First, from the state shown in FIG. 6, the fixed shaft 3 is rotated by 90 degrees, and the shape thereof is dropped into the main plate hole 1a having a larger outer shape than the shaft portion 3a of the fixed shaft. At that time, the fixed shaft 3 is received by the bottom surface of the main plate hole 1a and its height is regulated, and a gap is secured between the upper surface of the main plate 1 and the fixed shaft collar portion 3b in which the pusher plate 2 is incorporated in a sectional manner. It Further, the eccentric flange 3b of the fixed shaft 3 is close to a position where it does not overlap with the position where the pressing plate 2 is incorporated in a plan view. In that state, the pusher plate 2 is installed on the main plate 1 from directly above, and then the fixed shaft 3 is rotated 90 degrees by a driver or the like. As a result, the fixed shaft 3 is compressed and fixed to the main plate 1, and the fixed shaft collar portion 3b hangs on the upper portion of the pusher plate 2 so that the pusher plate 2 is fixed by the slope 3f of the collar portion 3b. As described above, in this embodiment, it is possible to easily fix the component by the eccentric brim without previously fitting the fixed shaft 3 to the base plate or forming the screw structure.

Although the fixing structure by the fixed shaft has been described above, the structure of the present invention maintains the fixing force when a strong pulling force is applied from the outside to the fixed shaft or when a strong force is applied in the rotating direction. Since it may not be possible, it is suitable for fixing structural parts that have some dimensional allowance, such as the calendar part, etc., compared to parts that require high dimensional accuracy and reliable fixing such as around the train wheel. It is believed that In addition, the fixing structure using a fixed shaft is thinner than the fastening structure using a screw because it does not require a screw length and is therefore suitable for fixing the calender part, which is a relatively thin structural part.

[0019]

[Effect of the device]

 As described above, according to the present invention, since the components of the timepiece can be fixed by the inexpensive plastic base plate and the fixing shaft having a simple shape, the cost of the entire timepiece move can be reduced. In addition, the workability of assembly and disassembly is also good because it can be done only by a normal driver without the need for special tools. Even if compared with the screw fastening structure, problems such as the breakage of the screw groove due to excessive screw tightening force and the screw not standing upright can be performed quickly and simply by rotating the fixed shaft 90 degrees. it can. Also, in terms of move size, unlike the screw structure, there is no need for screw length, so the move thickness can be reduced.

[Brief description of drawings]

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

FIG. 2 shows a fixed shaft used in the first embodiment of the present invention,
(A) is a side view seen from the lateral direction of the shaft, and (b) is a back view seen from the tip direction of the shaft.

3A and 3B are state diagrams of the first embodiment of the present invention seen from the lower surface side, FIG. 3A shows a state before a fixed shaft is fixed to a main plate, and FIG. 3B shows a fixed state.

FIG. 4 is a partial sectional view showing a second embodiment of the present invention.

FIG. 5 is a partial sectional view showing a third embodiment of the present invention.

FIG. 6 is a partial sectional view showing a fourth embodiment of the present invention.

FIG. 7 is a partial cross-sectional view showing a first conventional example.

FIG. 8 is a partial cross-sectional view showing a second conventional example.

[Explanation of symbols]

 1 Main plate 2 Push plate 3 Fixed shaft 4 Day plate 5 Day rotating wheel 11 Set female screw 12 Screw tube 13 Fixed shaft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Takeo Muto 6-12 Hommachi Honmachi, Tanashi City, Tokyo Citizen Watch Co., Ltd. Tanashi Factory

Claims (1)

[Claims for utility model registration] 1. In an electronic timepiece using a plastic base plate, a shaft portion having a long direction in one direction and a short length in a direction perpendicular to the long direction and an outer shape of the shaft unit. A fixed shaft composed of a large-diameter shaft part and a flange part having a step, and a deformed hole slightly larger than the entire outer circumference of the shaft part of the fixed shaft, and a base plate formed of a plastic material. , The main plate hole has a long direction and a short direction, and the dimension of the main plate hole in the short direction is set shorter than the length of the fixed shaft, and the short part of the main plate hole has a length of the stop shaft. A fixing structure for watch parts, which is characterized in that it is elastically deformed by the shank to generate a fixing force.