JP2509037Y2 - Watch parts fixing structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a fixing structure for parts incorporated in a main plate of a timepiece.

[Conventional technology]

The conventional fixing structure for a timepiece component has a structure as shown in FIGS. 4 and 5. FIG. 4 is a sectional view showing a first conventional example. In FIG. 4, the shaft 1a formed on the main plate 1 and the hole 2a of the train wheel bridge 2 which is a component incorporated in the main plate are engaged and positioned, but because of the relationship of shaft 1a <hole 2b When the circuit block 3 guided by the shaft 2b of the train wheel bridge 2 is detached and attached, the stability is poor, and the train wheel bridge 2 sometimes comes off the main plate 1.

FIG. 5 is a sectional view showing a second conventional example. In FIG. 5, the shaft 1a of the main plate 1 is larger than the hole 2a of the train wheel bridge 2 by 1a.
> 2a interference fit. In this example the hole when incorporating
Since the shaft 2a is installed while expanding the shaft 2a, a considerable force is required when the shaft is installed and disassembled, and the shaft and hole are scraped. In addition, since there are variations in the machining accuracy of both the shaft and the hole, the variation must increase the setting of the amount of squeeze and the force must be increased. Therefore, the train wheel bridge is stable without being detached from the circuit block 3 or due to an impact. However, the train wheel bridge 2 was built in and was not easily disassembled, and there was a great risk of damage.

[Problems to be solved by the device]

In the conventional fixing structure for a timepiece component, as in the first conventional example, when attaching and detaching other components, there are problems such as poor stability, misalignment, and disengagement from the main plate, resulting in poor assemblability. Further, in order to fix the parts, it is necessary to use parts such as screws, resulting in an increase in cost. Also, when engaging with the ground plate as in the second conventional example, there is a large variation in the amount of interference and a considerable force is required at the time of assembling / disassembling, the assemblability of the parts is poor, and the parts may be damaged. there were.
In addition, parts were scraped by assembling the shimshiro, and the scraps scraped moved inside the timepiece and adhered to the drive part and stopped. Further, since it is not possible to correct the positions of the ground plane and the parts, it is necessary to recreate the parts when the position shift occurs, and the parts and the ground plane must have strict machining accuracy, and an increase in the machining cost cannot be avoided. Therefore, the method of fixing parts of the present invention is to improve the assemblability, to prevent the parts from being detached from the main plate and to be damaged or scraped off, to improve the positioning accuracy of the parts, and to reduce the fixing parts such as screws to reduce the amount of the main plate and parts. The purpose is to reduce the processing cost.

[Means for Solving the Problems]

The method of fixing a timepiece component of the present invention comprises a main plate that serves as a machine frame and a component that is positioned and incorporated in the main plate, and a shaft portion formed in the main plate and a hole portion provided in the component are engaged with each other. The parts are detachably fixed by plastically deforming the periphery of the hole.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a fixing portion including one embodiment of the present invention, and FIG. 2 is an overall sectional view including other parts, and FIG.
The figure is a plan view thereof. In FIG. 1, a train wheel bridge 2 of a component that is positioned and incorporated in a shaft 1a of a main plate 1 serving as a machine frame
Hole 2a is engaged. At this time, the diameter d1 of the shaft 1a and the diameter of the hole 2a
Compared with d2, the backlash engagement is d1> d2, and assembly can be done smoothly. In this state, the jigs 21 and 22 for plastically deforming the hole 2a of the train wheel bridge 2 are pushed to the vicinity 2c of the hole 2a to the positions 21 'and 22' by pushing the train wheel bridge 2 to the holes 2a to 2a '. Plastically deform. At this time, the shaft diameter of the shaft 1a of the main plate and the hole 2a of the train wheel bridge 2 is
Since d1 ≧ hole diameter d2, the train wheel bridge 2 is less likely to come off the main plate 1. The hole diameter d2 at this time is determined by the pushing amount of the jigs 21 and 22. Therefore, the amount of crimping can be adjusted by adjusting the amount of pushing of the jigs 21 and 22, which can be easily removed or not removed at all. There is no variation in the tolerance of shaft diameter and hole diameter as in the past, the amount of interference can be stabilized, and the removal force of parts can be made constant.
The present invention, which easily adjusts the amount of shimshiro, improves the workability when assembling / disassembling and damages the parts because the amount of shimshiro is increased in consideration of the variation in tolerance.

The position of the shaft 1a of the main plate and the hole 2a of the train wheel bridge also deviates due to processing accuracy. In particular, in the train wheel bridge, there are many train wheels for indicating the pointer, and if the positional deviation from the main plate becomes large, creases and the like in the train wheel will increase and the clock will stop. Positional accuracy and diameter were always managed with severe acne. Fig.1 Jig
Although 21 and 22 are pressed almost evenly, if the balance is changed, the amount of crushed holes by the jig 21 and that of the jig 22 can be changed. By this operation, the main plate 1 of the train wheel bridge 2
It is possible to correct the position with respect to
The positioning accuracy with respect to the main plate 1 can be built in with high accuracy regardless of the processing accuracy of the parts.

In FIG. 1, a considerable force is required to plastically deform the train wheel bridge 2. Therefore, it is necessary to receive the force of the jig by the receiving member 23 so that the base plate 1 is not damaged by the force of the jigs 21 and 22.

An outline of a timepiece using an embodiment of the present invention will be described with reference to FIGS. A stator 14 that constitutes a step motor is sandwiched between the main plate 1 and the train wheel bridge 2, and a rotor 4 is provided.
Is pivotally supported. Further, a fifth wheel 5, a second hand wheel 6, a minute hand wheel 7 and a third wheel 8 which are a wheel train group for indicating hands are pivotally supported and transmit the rotation of the rotor 4. Further, the time adjusting member such as the shiori 10, the lantern 9, the train wheel setting lever 11 and the like also properly maintain the play in the cross-sectional direction between the main plate 1 and the train wheel bridge 2. Further, the minus lead plate 12 guided by the shafts 1b and 1c formed on the main plate 1 is incorporated, and the train wheel bridge 2 is guided and incorporated by the dowel 1a of the main plate 1 and the screw pin 19 press-fitted into the main plate 1. There is. The minus lead plate 12 is a battery that serves as a power source.
It is in contact with 24 and has negative conduction with circuit block 3. Conventionally, after the train wheel bridge 2 is assembled, the train wheel bridge 2 is screwed so as not to come off from the main plate 1 due to vibration or impact. However, in order to tighten the screw, a screw and a screw pin are required, and further, a space is required, which hinders the miniaturization of the timepiece. In this example, a jig is pressed near the 2a and 2d parts of the train wheel bridge 2 to deform the hole of the train wheel bridge so that the dowel 1a of the main plate 1 and the screw pin 19 are crimped. The train wheel bridge 2 is fixed to the main plate 1. After incorporating the wheel train bridge 2, the circuit block 3 on which the crystal oscillator 3b serving as the oscillation source and the integrated circuit 3c serving as the drive circuit are mounted is guided to the dowel 2b of the train wheel bridge 2 through the guide hole 3a of the circuit block 3. Incorporated as a plus lead plate 13
, And is fixed with screws 17 and 18. The coil block 15 is fixed by screws 16. Also coil block
15 is fixed by a screw 16 and can be replaced without removing the train wheel bridge 2. Therefore, the workability is improved because the coil block that easily cuts the thin coil wire can be replaced without removing the train wheel bridge 2. The positive lead plate uses the lead spring 13f for positive conduction from the battery 24. The positive lead plate 13 ensures that the train wheel bridge 2 is firmly attached to the main plate by the springs 13a, 13d and the dowels 13g. Also, the lever 10 is pressed by the spring 13e so as not to come off from the external operating member 25 by the operation of the external operating member 25. The positive lead plate receives these reaction forces, but it can not be supported by only two screws 17 and 18, so the hooks 13b and 13c have 1d of the main plate 1,
The train wheel bridge 2 is hooked to the 1e part and the reaction force pushing up from the oshidori 10 is received.

FIG. 6 is a sectional view showing a second embodiment of the present invention.
In the example of FIG. 1, the train wheel bridge 2 is deformed, but in FIG. 6, the shaft 1a of the main plate 1 is deformed to 1a ′ and fixed to the train wheel bridge 2. In this method, if the shaft 1a becomes thin, the shaft may break due to the force when it is deformed, so care must be taken when the shaft 1a is thin.

In Fig. 1, the height h1 of the shaft and the train wheel bridge 2 that can be deformed
The heights h2 of the two are the same. Fixing is possible if h1 ≥ h2, but if h1 <h2, the part deformed by the jig will not engage with the shaft and cannot be fixed. Where h2 and h1
If the difference is small, it can be fixed enough. H1 at this time
The relationship between h2 and h2 is h1 ≦ 4 / 3h2.

In the embodiment shown in FIG. 1, the train wheel bridge 2 is fixed to the base plate 1 after it is plastically deformed by the jigs 21 and 22. However, the same effect can be obtained by deforming the hole 2a of the train wheel bridge 2 in advance by the jig itself and then incorporating it into the main plate 1.

Next, regarding the shapes of the jigs 21 and 22, when the jig 21 is pushed down to near the center of the train wheel bridge 2 in FIG. 1, the back side 2e of 2c part bulges toward the main plate 1 and the train wheel bridge 2 The height of will change. If the pushing amount of the jig is 1 / 3h2 or less, the bulging of the 2e portion does not occur, but in the case of a conical jig with a constant depth and a small volume, the pushing depth becomes deep and the bulging of the 2e portion easily occurs. FIG. 7 is a diagram showing the shape of the jig. By making the jig shape into a plate prism shape similar to that of a driver as shown in FIG. 7 (a), the volume at a certain depth is increased and the amount of pushing in the jig is reduced compared to the conical jig. 1
It is possible to prevent the 2e portion of the train wheel bridge 2 in the figure from bulging. FIG. 7 (b) shows a jig having the shape shown in FIG. 7 (a).
The train wheel bridge 2 pushed into the position is shown. In the case of a jig having a rectangular cross section, if the long side is set to face the direction of the hole 2a like 2c, the deformation amount of the hole 2a becomes larger than the pushing amount.

[Advantages of the Invention] As described above, according to the present invention, the following effects can be obtained by plastically deforming and fixing a component positioned on the main plate with a jig or the like.

First, the stability of the parts is improved, and the parts will not come off from the main plate when the parts to be assembled later are attached or detached. Further, it is difficult to disengage from vibration caused by movement between processes due to automatic assembly or the like. Further, the amount of interference between the shaft and the hole can be kept constant depending on how the jig is deformed, and the removing force is also constant. Therefore, it is possible to disassemble with a small force, and there is no problem that the components cannot be disassembled when they are assembled like the conventional fixing with the shimshiro, or the parts are damaged when disassembling.

Next, since the amount of deformation can be adjusted by the jig, the position of the hole of the component can be set at an arbitrary position with respect to the axis of the base plate. Therefore, the position of the component can be finely adjusted with respect to the ground plane. Particularly in the case of a train wheel bridge that holds the train wheel, misalignment with the main plate can be corrected to reduce creases and inclination of the train wheel, it is possible to compensate for lack of machining accuracy and lower machining accuracy to make parts at low prices be able to.

With this fixing structure, it is possible to reduce the number of screw tightening points, which leads to cost reduction by downsizing the watch and reducing the number of parts.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention. FIG. 2 is a sectional view showing the entire timepiece of one embodiment of the present invention.
FIG. 3 is a plan view thereof. FIG. 4 is a sectional view showing a first conventional example. FIG. 5 is a sectional view showing a second conventional example. FIG. 6 is a sectional view showing a second embodiment of the present invention. FIG. 7 is a view showing the shape of the jig of the present invention. 1 …… Main plate 2 …… Race train receiver 3 …… Circuit block 13 …… Plus lead plate 21 …… Jig 22 …… Jig 23 …… Receiving member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shozo Kushida 6-31-1, Kameido, Koto-ku, Tokyo Seiko Denshi Kogyo Co., Ltd. (56) References: 63-135189 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A base plate that serves as a machine frame and a component that is positioned and incorporated into the base plate. A shaft portion formed in the base plate and a hole portion provided in the component engage with each other, and A structure for fixing a timepiece component, characterized in that the periphery is plastically deformed to fix the component detachably.