JPS6043746B2 - Manufacturing method of pulse motor for watches - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a pulse motor for a battery-powered watch.

[Conventional technology]

Since the motor of a battery-powered watch is small and uses a small-capacity battery, extremely high efficiency is required.

Therefore, tight tolerances are required for the accuracy and relative position of parts. Furthermore, when working on small parts such as wristwatches, there are significant difficulties in how to chuck the parts and in preventing deformation during processing. In terms of performance, the gap between the rotating rotor and the left stator or the right stator, and the relative position between the left stator and the stator, that is, the gap for generating effective magnetic flux that rotates the rotor, and the gap for regulating the rotation direction. Slight differences in level are important.

In other words, if current flows through the coil, NNS will be generated at the end of the stator.
The poles are induced, N and S attract, and like-poles repel, giving the magnetic rotor a rotational force. However, if the gaps between the left and right stators and the rotor are equidistant as shown in Figure 1, the rotor will move left and right. I don't know which direction it will rotate. The rotor of a watch needs to rotate only in one direction, for example clockwise; if it rotates counterclockwise, the second hand will rotate in the opposite direction. In order to prevent this reverse rotation, for example, a reverse rotation prevention lever can be provided, or the gap between the rotor and stator can be arranged so that it gradually narrows in the direction of rotation of the rotor, as shown in Figure 2. Rotates only. In other words, there is a certain relationship between the difference between the widest gap T between the rotor and stator and the narrowest gap between the rotor and stator, and the rotational torque (remaining force) of the rotor. be. When adjusting the step motor, the step difference between the left and right stators must be adjusted so that this surplus force is maximized. ``[Problem to be solved by the invention] Therefore, as shown in Utility Model Publication No. 44-13903 ``Adjusting device for drive mechanism of battery watch'', fine adjustment is required using eccentric pins, guide pins, etc., which requires a lot of man-hours. there was.

In the conventional type, as shown in FIG. 3, the left stator 12 and the right stator 11 were manufactured and assembled completely independently, so the relative precision between the height and the bottom was not achieved.

Therefore, the left stator 12 and the right stator 11, which sandwich the rotor 17, are connected to positioning pins 13 and 14 provided on the base plate (not shown), which is the center of rotation, and an eccentric adjustment screw 15, respectively.
, 16, etc., and methods such as strictly controlling and sorting parts were used. For this reason, not only did adjustment take an extremely long time and the yield of parts was poor, but the left and right stators also had to be inspected and adjusted separately. The present invention eliminates such drawbacks and provides a motor stator that does not require fine adjustment of the step difference between the left and right stators after the step motor is installed, has good assembly workability, and is excellent in machining and mass production. [Means for Solving the Problems] In order to eliminate the above-mentioned drawbacks, the present invention laminates and fixes a piece of stator material, which has been arranged in advance at a predetermined relative position, to a mating plate made of a non-magnetic material, and After forming an inner hole through the stator material and the mating plate so as to surround the outer periphery of the stator material, a slit is made to form the opposing magnetic pole tips of the stator (with a part of the mating plate in a bridging state). SIitting cutter
er), etc., and is divided into a plurality of parts.

〔Example〕

Next, an embodiment of FIGS. 4a to 4b will be described. In FIG. 4a, 21 is a mating plate made of non-magnetic material, 22 is a left stator, and 23 is a right stator. It is made of magnetic material and is fixed to the mating plate 21.

24 and 25 are positioning pin holes, and the pins (
left stator 22 together with plate 21 (not shown)
and the right stator 23 is positioned at the normal position.

The manufacturing method is as follows: left stator 22 and right stator 23
The stator material shall be manufactured from the stator material in the same arrangement as in the completed use condition, and the stator material having a partial notch 27 in the outer shape of the mating plate material as shown in FIG. Fix it in an appropriate way. Then, put this superimposed material into a highly precise cutting die, shape the outer shape,
Cut out the inner shape and small hole. And finally slitting. The opposing magnetic pole portions of the left stator 22 and right stator 23 are separated using a cutter. However, since the outer sides of the mating plates are connected, the left stator 22 and the right stator 23 are not separated.
As described above, the left stator 22 and the right stator 23 are integrally shaped in the same arrangement as in use, so their relative positions are secured.

In addition, the positioning pin holes 24 and 5 do not need two holes 13 and 15 on the left stator and two holes 14 and 16 on the right stator, respectively, as in the conventional case, but because they are provided across the left stator and the right stator, the distance between the pin holes can be reduced. It can be made long, and it is easy to center the rotor. Furthermore, the number of parts during assembly can be reduced and the number of screws can be omitted. Note that even if the left and right stators are connected by a small cross-sectional area on the mating plate, or even if the mating plate is made of a material with weak magnetic properties, there will be a slight electrical charge. Even if the mechanical conversion efficiency is reduced, it is within the scope of the present invention. Furthermore, the process of laminating the laminated plate material and the stator material can be selected at an appropriate stage, and methods such as pressing and laser processing can also be considered for dividing the left and right stators without using a cutter. Further, in the above embodiment, the case where there are two stators has been described, but it can be applied to cases where there are two or more stators, and of course there is no limit to the number of poles of the rotor. [Effects of the Invention] As is clear from the above description, according to the present invention, the following effects can be obtained.

(1) Since the left and right stators are integrated, relative positional accuracy is guaranteed, no adjustment is required, and the number of parts can be saved by omitting eccentric adjustment screws and reducing the number of set screws.

(2) Since the left and right stators are manufactured as a pair with the same arrangement as in use, their relative positions are preserved.

Therefore, no adjustment is required during assembly. (3) Left,
The distance between the positioning pin holes of the right stator can be increased,
Alternatively, since the matching plate can be used for positioning, it is easy to determine the position of the stator relative to the rotor.

(4) The mating plate is unrelated to performance, and the thickness, shape, and material can be selected relatively freely, so no stress deformation occurs due to pressing, cutting, drilling, or processing when dividing the left and right stators. Appropriate reinforcement of the stator can be done.

(Especially effective on the tip.)

[Brief explanation of drawings]

Figure 1 is a plan view showing the general principle of a pulse motor with no restrictions on the rotation direction, Figure 2 is a plan view showing the general principle of a pulse motor that rotates clockwise, and Figure 3 is a plan view of a conventional pulse motor. A plan view showing the structure of the stator, FIG. 4 is a view showing an embodiment of the present invention, FIG. 4 a is a plan view, and FIG. 4 b
FIG. 2 is a plan view showing an intermediate step of laminating the stator member and the laminated plate member. 17... Rotor, 21... Matching plate, 22, 23... Stator, 24, 25...
・Positioning holes, 61, 62... Stator, 63.
...Matching plate, 64...Bearing, 65...
...Drive coil.

Claims (1)

[Claims] 1. A method for manufacturing a pulse motor for a watch, which comprises a rotor, a plurality of stators made of a magnetic material and formed to surround the outer periphery of the rotor, and a drive coil for exciting the stator, in which the stator material is made of a non-magnetic material. After forming an inner hole through the stator material and the mating plate so as to surround the outer periphery of the rotor, the opposing magnetic poles of the stator are bonded with a part of the mating plate in a bridging state. A method of manufacturing a pulse motor for a timepiece, characterized in that the pulse motor is divided into a plurality of parts to form a tip part.