JPS6126634B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a timepiece, in particular, the stator yoke of a step motor, which is a driving source, is used as a case of the timepiece, and the rotor of the step motor is also used as a minute hand, thereby reducing the number of parts. This article relates to a watch that aims to reduce the amount of waste.

Conventionally, there is no timepiece that uses the stator yoke of a motor as a watch case. Furthermore, there are no watches that use the motor rotor itself as the minute hand.

The present invention has been proposed in view of the above points, and the timepiece of the present invention will be invented below with reference to the drawings.

1 to 4 show an embodiment of the present invention. In the figures, 1 is a shallow cup-shaped first stator yoke, and this first stator yoke 1 is as shown in FIG. At the peripheral edge, magnetic pole teeth 1a bent outward in an L-shape are spaced apart from each other by 30 mm.
It is arranged in equal parts. Reference numeral 2 denotes a deep cup-shaped second stator yoke that houses the first stator yoke 1 therein, and magnetic pole teeth 2a extending along its length are spaced apart from each other on the peripheral edge of the second stator yoke. It is arranged in equal parts, and the outer periphery forms the case of the watch. Reference numeral 3 denotes a coil frame disposed at the lower central part of the second stator yoke 2. A coil 4 is wound around the outer periphery of the coil frame 3, and a substantially cylindrical core is formed in the air core formed in the central axial direction. The iron core 5 is inserted. A stator yoke 1 is fixed to the upper end of the iron core 5 inserted into the air core of the coil frame 3, and a stator yoke 2 is fixed to the lower end. They are each connected concentrically via an iron core 5. In this case, as shown in FIG. 3, the magnetic pole tooth 1a of the stator yoke is arranged between the magnetic pole teeth 2a, 2a of the stator yoke 2, and the magnetic pole tooth 1a
The position is slightly offset from the middle of the magnetic pole teeth 2a, 2a that are spaced apart from each other. A bearing hole 5a is bored in the iron core 5, and an hour hand shaft 6 is rotatably supported in the bearing hole 5a.

Reference numeral 7 shown in FIG. 4 is a disc-shaped minute hand board made of a transparent molded material such as acrylic, and a portion of the surface of this minute hand board 7 has a minute hand 7a extending radially from the center as shown in the figure. printed or affixed. In addition, a rotor is formed on the outer periphery of the minute hand board 7, and a ring 8 made of permanent magnets equally divided into 60 poles (N, S, N, S...) is provided integrally with the minute hand board 7. , this permanent magnet ring 8 is arranged opposite to the magnetic pole teeth 1a, 2a with a gap therebetween. Thus, the minute hand board 7 is integrated with the minute hand wheel 9. The hour hand shaft 6 is smoothly inserted into a through hole bored in the axial direction at the center of the minute wheel 9, and the minute hand wheel 9 is supported on a main plate 10. The minute wheel 9 is the transmission wheel 11
The transmission wheel 11 meshes with the hour hand wheel 12 which is integrated with the hour hand shaft 6.

13 is an hour hand attached to the tip of the hour hand shaft 6; 14 is a disc-shaped dial placed below the minute hand board 7; are in contact and supported. 15 is a ring-shaped front cover having a bent part 15a extending inward, and this front cover 15 is attached to the open end of the second stator yoke 2 and is slightly curved. A bent glass 16 is inserted between the bent portion 15a and the end portion 15b. Therefore, when looking into the inside of the timepiece of the present invention configured as described above through the glass 16, the hour hand 13, the minute hand 7a printed on the minute dial 7, and the dial 14 can be seen through the transparent minute dial 7. be able to. Note that since the permanent magnet ring 8 is hidden by the bent portion 15a of the front cover 15, the aesthetic appearance is not impaired.

Next, the operation of the present invention will be explained.

In the timepiece of the present invention, the permanent magnet ring 8, which is equally magnetized into 60 poles alternately as N, S, N, S..., is connected to the stator yoke 1 and the stator arranged as shown in FIG. It faces the magnetic pole teeth 1a, 2a of the yoke 2 with a predetermined distance therebetween as shown in FIG.

Therefore, when the coil 4 is energized now, the magnetic pole teeth 1a and 2a are alternately N, S, N, S.
...and are excited to different polarities. In this case, when the polarity of the current is alternately reversed, the polarity of the magnetic pole teeth 1a and the magnetic pole teeth 2a is also alternately reversed, so a repulsive and attractive action occurs between the permanent magnet ring 8 and the permanent magnet ring 8. Rotate. At this time, since the magnetic pole teeth 1a and the magnetic pole teeth 2a are arranged offset, the direction of rotation is always constant. That is, if the excitation current is an alternating current pulse current of 1/120 Hz, the permanent magnet ring 8 will be rotated by 6 degrees by one pulse of excitation current per minute. Therefore, the minute hand 7a on the minute hand board 7, which is integrated with the permanent magnet ring 8, rotates by one minute every minute. The hour hand wheel 12 is decelerated to 1/12 of the rotational speed of the minute hand 9 through the intervention of the transmission wheel 11, so that the minute hand 7a changes from 1 hour to 1
When rotated, the hour hand 13 rotates by 1/12 (30 degrees), which means that it rotates for exactly one hour.

5 to 7 show other embodiments of the present invention, and this embodiment differs from the previous embodiments in that the long minute hand 7a attached to the minute wheel 9 has a substantially arc-shaped permanent tip. A magnet piece 8a is integrally attached to constitute a rotor, and this permanent magnet piece 8a has two magnets, N and S, at an interval of 6 degrees from the attachment point of the base of the minute hand 7a, that is, the center of the clock face. It is at the point where the pole is magnetized.

Note that the other structures are exactly the same as those of the previous embodiment, so the same members are given the same reference numerals and explanations will be omitted.

Therefore, in this embodiment, N, S
A permanent magnet 8a magnetized to two poles is attached to the stator yoke 1.
The magnetic pole teeth 1a and 2a of the stator yoke 2 are arranged opposite to each other at a predetermined interval, and when current is applied to the coil 4, the magnetic pole teeth 1a and 2a
As shown in Figure A, different poles are excited.

Then, when the polarity of the excitation current is alternately reversed, the polarities of the magnetic pole teeth 1a and 2a are also alternately reversed, as shown in FIG. 4B. Therefore, a repulsive and attractive action occurs between the minute hand 7a and the permanent magnet 8 attached to the tip thereof, and as shown in FIG. 4C, the permanent magnet 8a moves due to the repulsive force, and as a result, the minute hand 7a rotates. In this case, since the magnetic pole teeth 1a, 2a are arranged offset as shown in FIG. 6, the direction of rotation is always constant. Note that other operations are substantially the same as those of the previous embodiment.

As described above, according to the timepiece of the present invention, the stator yoke of the motor is used as the case of the timepiece, and the rotor is used as the minute hand of the timepiece, so the number of parts can be reduced, and the number of parts can be reduced. This has the practical effect of making it possible to obtain an inexpensive watch.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory view of an embodiment of a timepiece according to the present invention, FIG. 2 is a partially exploded perspective view of the same, FIG. 3 is a partially assembled view of the same, and FIG. 4 is a minute hand plate used in the present invention. 5 is a cross-sectional explanatory diagram of another embodiment of the present invention, FIG. 6 is an explanatory diagram of the assembled state of the stator yoke and the minute hand used in the same, and FIG. 7 is an explanatory diagram of the operation. DESCRIPTION OF SYMBOLS 1... First stator yoke, 2... Second stator yoke, 1a, 2a... Magnetic pole teeth, 3... Coil frame, 4... Coil, 5... Iron core, 5a... Bearing hole, 6...Hour hand shaft, 7...Minute hand plate, 7a...Minute hand, 8...Permanent magnet ring, 8a...Permanent magnet piece, 9...Minute wheel, 10...Main plate, 11...Transmission wheel, 12 ...Hour hand wheel, 13...Hour hand, 14...Dial, 15...Front cover, 15a...Bending part,
15b... end.

Claims (1)

[Scope of Claims] 1. A cup-shaped first stator yoke in which magnetic pole teeth extending in the length direction are formed on the peripheral edge and whose outer peripheral part forms a watch case; An alternating current is passed through a cup-shaped second stator yoke which is bent into a shape and has magnetic pole teeth positioned between the magnetic pole teeth, and which is housed in the first stator yoke. , and the magnetic pole teeth of the first and second stator yokes are coupled concentrically via an iron core inserted into a coil frame around which a coil is wound to alternately excite each magnetic pole tooth to a different polarity. A timepiece characterized in that rotors having permanent magnets are disposed opposite each other with a space therebetween, and the rotors form a minute hand. 2. The timepiece according to claim 1, wherein the rotor comprises a disc-shaped minute hand disk with a minute hand displayed on its surface, and a ring-shaped permanent magnet ring attached to the outer periphery of the minute hand disk. 3. The timepiece according to claim 1, wherein said rotor comprises a longitudinal minute hand and a substantially arc-shaped permanent magnet piece attached to the tip of said minute hand.