JPH0447276B2 - - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece mechanical body used in a quartz watch.

[0002]

[Prior art and its problems] Traditionally, the watch has a three-piece base plate structure consisting of an upper case, a lower case, and a middle plate, and the watch wheel train is driven by a small watch motor consisting of a stator and a rotor. A clock mechanical body for an analog crystal clock is known.

[0003] In this known three-piece base plate structure, the stator is positioned by the middle plate, but the rotor is supported by the upper plate and the lower plate. With this configuration, both ends of the rotor are rotatably supported by the main plate (upper plate and lower plate) that is different from the main plate (middle plate) that positions the stator, so the stator's magnetic poles It becomes difficult to increase the gap precision between the rotor and the permanent magnet of the rotor, and it is inevitable that the performance or quality of the watch mechanical body will vary.

[0004] Furthermore, stator positioning can be divided into vertical positioning and horizontal positioning, but conventionally this was done using the same support pillar, so accuracy control of the stator support pillar was difficult. It was strictly required.

[0005]

[Object of the Invention] Therefore, an object of the present invention is to reduce the influence of manufacturing errors in the upper case, middle plate, and lower case on the gap accuracy in the horizontal direction between the magnetic poles of the stator and the permanent magnets of the rotor. The object of the present invention is to provide a timepiece mechanical body that is easy to control accuracy and is simple in structure and assembly.

【0006】

[Means for Achieving the Object] In order to achieve the above object, the timepiece machine body of the present invention having a three-piece base plate structure has an upper case and a lower case that are arranged in contact with both sides of the stator so as to extend the vertical direction of the stator. Support columns for positioning are formed respectively, and the middle plate has protrusions that fit into through holes formed in the stator to position the stator in the horizontal direction, and a permanent magnet side of the rotor shaft. A bearing is formed to rotatably support the end of the shaft.

【0007】

[Function] The relative positional accuracy between the stator and rotor includes positional accuracy in the vertical direction (rotor axial direction) and horizontal direction (radial direction of the rotor). is the positional accuracy, especially in the horizontal direction (radial direction of the rotor).
According to the configuration of the present invention, the rotor shaft end portion of the rotor on the side closer to the permanent magnets is supported by the middle plate that positions the stator in the horizontal direction. (radial direction) positional accuracy, that is, gap accuracy, can be easily ensured to the necessary and sufficient level. Furthermore, since the vertical positioning and horizontal positioning of the stator can be managed separately, it becomes easy to manufacture molds for the upper plate, middle plate, or lower plate.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. As shown in the first diagram, the watch body has a three-piece base plate configuration consisting of an upper case 1, a lower case 2, and a middle plate 3, and the wheel train of this watch body consists of a small stator 4 and a rotor 5. It is designed to be rotationally driven by a motor. The rotor 5 coaxially includes a permanent magnet 6 that faces the magnetic pole portion 4a of the stator 4, and a pinion 51 that meshes with a transmission gear 7 that is a next-stage gear.

[0009] Support columns 1a and 2a are integrally formed at opposing positions of the upper case 1 and lower case 2, and the tip surfaces of both support columns are in contact with both sides of the stator 4. This stator is clamped. Therefore, the stator 4 has both support columns 1a,
Positioning in the vertical direction is performed on the distal end surface of 2a.

[0010] A through hole 4b is bored in the stator 4,
A protrusion 3a formed on the intermediate plate 3 is fitted into this through hole. Therefore, the stator 4 is positioned in the horizontal direction by the projections 3a.
This stator is prevented from moving in the horizontal direction.

[0011] The middle plate 3 that positions the stator 4 in the horizontal direction is provided with a bearing 3 that rotatably supports the end 5b of the shaft portion 5a of the rotor 5 on the permanent magnet 6 side.
b is integrally formed. An end 5c of the shaft 5a of the rotor 5 on the pinion 51 side is rotatably supported by a bearing 2b integrally formed with the lower case 2. A bobbin 8 around which a coil 9 is wound is fitted onto the stator 4. Further, the transmission gear 7 meshing with the pinion 51 of the rotor 5 is supported by a bearing 2c of the upper case 2 and a bearing 3c of the middle plate 3. Note that, as shown in the second figure, a tip 21a of an engaging column 21 formed integrally with the lower case 2 is inserted into a through hole 41 formed in the stator 4.

[0012] To assemble the watch mechanical body with the above configuration, first, the rotor 5 and gear 7 are placed between the lower case 2 and the middle plate 3.
The assembly is completed by assembling the other components, then assembling the stator 4, and finally covering the upper case 1 with the lower case 2.

[0013] In this assembled state, the vertical positioning of the stator 4 is performed by the tip surfaces of the support columns 1a and 2a, and the horizontal positioning of the stator 4 is performed by the protrusions 3a of the middle plate 3. It is being carried out.

[0014] By the way, when considering the stator 4 as a reference, the bearing 2b of the lower case 2 is more sensitive to the horizontal position of the stator 4 than the bearing 3b of the middle plate 4, which directly positions the stator 4 in the horizontal direction. It is undeniable that the positional accuracy in the direction decreases and this is a win. Therefore, in the bearing 2b of the lower case 2, where the horizontal positional accuracy with respect to the stator 4 is likely to decrease, the rotor shaft end 5 on the square side, which is located far from the permanent magnet 6,
The permanent magnets 6
Permanent magnet side rotor shaft end 5b located closer
By supporting the stator magnetic pole portion 4a and the rotor 5, the horizontal forming position error of the bearing 2b can be avoided.
The effect on the horizontal gap accuracy between the

[0015] Motor performance is greatly affected by the gap accuracy in the horizontal direction between the stator magnetic pole part 4a and the rotor 5, so by adopting the above configuration, the horizontal gap accuracy of the bearing, especially 2b, can be improved. This means that the influence of molding position errors on motor performance becomes smaller.

【0016】

[Effects of the Invention] As described above, according to the present invention,
By supporting the permanent magnet side end 5b close to the permanent magnet 6 by the bearing 3b of the intermediate plate 3 that positions the stator 4 in the horizontal direction, the other bearing 2b can be shaped in the horizontal direction. The influence of positional errors on the gap accuracy in the horizontal direction between the stator magnetic pole portion 4a and the rotor 5 is further reduced. As a result, the influence of the horizontal molding position error of the bearing 2b on the motor performance is reduced, and therefore, it is possible to stably mass-produce a timepiece mechanical body without variations in performance or quality.

Furthermore, since the vertical positioning and horizontal positioning of the stator 4 can be managed separately, it is easy to manufacture molds for the upper case 1, middle plate 3, or lower case 2. become. That is, for the support columns 1a and 2a that position the stator 4 in the vertical direction, only the length accuracy needs to be managed, and for the protrusion 3a of the middle plate 3 that positions the stator 4 in the horizontal direction, it is necessary to manage only the length accuracy. need only manage its horizontal position accuracy. the result,
It becomes easy to manufacture the upper case 1, lower case 2, and middle plate 3, and to manufacture molds for these.

[Brief explanation of the drawing]

[Fig. 1] A sectional view showing an embodiment of a timepiece mechanical body according to the present invention.

[Figure 2] Cross-sectional view of the main parts of the mechanical body of the same watch

[Explanation of symbols] 1...Top case 1a...Support pillar 2...Lower case 2a...Support pillar 2b...Bearing 3... Middle plate 3a...protrusion 3b...Medium plate bearing 4...Stator 4a... Magnetic pole part of stator 4b...Through hole 5...Rotor 51...Rota's kana 5a... Rotor shaft 5b...End of rotor on permanent magnet side 5c... End of the rotor on the pinion side 6... Permanent magnet of the rotor.

Claims (1)

[Claims] Claim 1: It has a three-piece base plate structure consisting of an upper case, a lower case, and a middle plate, and a watch wheel train is driven by a small watch motor consisting of a stator and a rotor, and the rotor is In a timepiece mechanical body coaxially having a permanent magnet facing the stator magnetic pole portion of the stator and a pinion meshing with the next stage gear, the upper case and the lower case have opposing faces on both sides of the stator. Support columns are formed in contact with each other to position the stator in the vertical direction, and the middle plate is fitted with through holes formed in the stator to position the stator in the horizontal direction. A projection and a bearing rotatably supporting the end of the rotor shaft on the permanent magnet side are formed, and one of the upper case and the lower case is provided with a bearing that rotatably supports the end of the rotor shaft on the permanent magnet side. A watch mechanical body, characterized in that a bearing is formed to rotatably support an end on the pinion side.