JPH0626462B2 - Method for manufacturing coil core of watch motor - Google Patents

Description

The present invention relates to a method for manufacturing a coil core of a timepiece motor applied to a quartz timepiece.

[Prior Art] Japanese Patent Laid-Open No. 61-8 as a conventional technology for manufacturing a timepiece motor.
No. 5048 discloses a method in which a flat surface is formed by pressing at both ends of a round bar-shaped iron core made of a magnetic material, and a coil is wound around the round bar-shaped portion.

Further, in Japanese Patent Laid-Open No. 62-44050, a bar made of a magnetic material is bent into a U-shape, and its central portion and both end portions are processed into a flat shape by pressing, and the processed portion has a magnetic pole and a coupling portion. There is disclosed a configuration for forming.

[Problems to be Solved by the Invention] The above-mentioned first conventional technique (Japanese Patent Laid-Open No. 61-85048).
Then, it is necessary to first cut a round bar-shaped iron core made of a magnetic material into a predetermined length, and then crush both ends of this iron core with a press to form a flat surface. However, since there is a lack of continuity in manufacturing, there is a problem in manufacturing efficiency, and it is not possible to manufacture a large number of coil cores at once, which is unsuitable for mass production.

Further, the above-mentioned second conventional technique (Japanese Patent Laid-Open No. 62-4405).
No. 0), a bar made of a magnetic material is first cut into a predetermined length, and then the bar is bent into a U shape,
It is necessary to crush the central portion and both end portions of this bar material with a press to form a flat surface.In such a manufacturing process, there is a problem in manufacturing efficiency due to lack of manufacturing continuity, and a large number of them are processed at once. It is not possible to manufacture the stator, and it is not suitable for mass production.

Therefore, an object of the present invention is to enable bending and pressing to be the first and second steps, and the cutting step, which was conventionally the first step, to be the final step, thereby enabling continuous processing of the coil core, It is an object of the present invention to provide a method of manufacturing a coil core of a timepiece motor, which is effective in reducing the manufacturing cost due to mass production by preventing the waste of waste.

[Means for Solving the Problems] A feature of the present invention is that a wire rod having a circular cross-sectional shape is bent into a rectangular wave shape such that horizontal portions and vertical portions are alternately and continuously positioned by the first step. Then, in the second step, the rectangular wave-shaped vertical portion is pressed into a flat surface, and in the third step, the wire rod is vertically cut along the central portion of the flat surface to form a U-shaped coil core. Where it is.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, one end of a wire 1 wound in a roll and having a circular cross-sectional shape is pulled out.

In the first step, as shown in the second drawing, the drawn wire 1 is bent into a rectangular wave shape in which horizontal portions 11 and vertical portions 12 are alternately continuous. In the wire rod 1 bent into the rectangular wave shape, the horizontal portions 11 have the same length and the vertical portions 12 also have the same length.

Then, the wire rod 1 bent as shown in FIG. 3 by the second step is sent out in the direction of the arrow to perform the progressive feed type multi-stage press working, and the rectangular wave-shaped vertical portion 12 located at the front side is processed.
The flat surface 12a is sequentially formed from the above.

Then, as shown in FIG. 4, the stator connecting holes 2, 2 are sequentially formed at upper and lower portions of the flat surface 12a fed in the direction of the arrow in the forward direction, and two adjacent stator connecting hole portions are formed. Line 3 is formed between 2 and 2.

Further, in the third step, as shown in the fifth drawing, the flat wire 12a is cut along the line 3 between the stator coupling holes 2 and 2, and the wire rod 1 is divided into upper and lower parts to form a U-shape. Use as coil core.

The wire rod 1 that has undergone the above steps has a flat surface 1 as shown in FIG.
2a is divided into upper and lower parts, which are flat connecting surfaces 121a and 121a for easy connection with a stator (not shown).
Becomes

The present invention forms a U-shaped coil core whose both ends are bent by performing the bending, pressing and cutting processes shown in FIGS. 1 to 6.

On the coil core completed through the above steps, as shown in FIG. 7, a known coil bobbin 4 is attached to the horizontal portion 11 of the wire rod 1, the motor drive coil 5 is wound, and the connecting surface 121a is formed.
The stator connecting hole 2 is used to connect to a stator (not shown).

The coil core for spot-welding the stator to the connecting surface 121a includes the stator connecting hole portions 2 and 2 shown in FIG.
The step of piercing is unnecessary.

EFFECTS OF THE INVENTION Since the present invention has the above configuration, there is no waste of material, continuous processing is easy by applying a progressive press machine, suitable for mass production, and reduction of manufacturing cost. Is extremely effective for

[Brief description of drawings]

The drawings show first to third processing steps according to the present invention. FIG. 1 is a front view of a wire rod in a drawn state, and FIG. 2 is a front view showing a shape in which the wire rod is bent in a rectangular wave shape. FIG. 3 is a front view of a state in which the vertical portion is processed into a flat surface, FIG. 4 is a front view of a state in which a stator connecting hole is formed in the flat surface, and FIG. Front view of the cut state,
FIG. 6 is a front view of the completed coil core, and FIG. 7 is a front view showing a state in which the drive coil is wound around the coil core. 1 ... Wire rod, 11 ... Horizontal part, 12 ... Vertical part, 12a ... Flat surface.

Claims (1)

[Claims] 1. A first step of bending a wire rod having a circular cross section into a rectangular wave shape such that horizontal portions and vertical portions are alternately and continuously positioned, and the rectangular wave-shaped vertical portion is flattened. Manufacture of a coil core for a timepiece motor, which comprises a second step of pressing into a coil and a third step of cutting the wire material up and down along the central portion of the flat surface to form a U-shaped coil core. Method.