Method for making a timepiece stepping motor

Details Method for making a timepiece stepping motor Method for making a timepiece stepping motor

1989-05-22

1990-04-03

Echols, P. W.

Metal working

Method of mechanical manufacture

Electrical device making

29418, 156152, 156256, 156268, 156305, 21912167, 21912172, 310 40MM, 310 49R, 368156, H02K 1500

Patent

active

049128329

ABSTRACT:
Method for manufacturing a timepiece stepping motor comprising the steps of: providing a flat one-piece stator member defining an opening for the rotor and having a pair of diametrically opposed narrow sections on either side of the opening; providing a movement frame having stator locating projections and defining a pair of holes larger than the narrow sections and extending through the movement frame; locating and attaching the stator to the frame with the narrow sections spanning the holes in the frame; cutting through the narrow sections with a laser to sever the stator into two members, utilizing the holes in the frame to dispose of vaporized metal from the stator; encapsulating and re-joining the severed sections with a plastic fixation; and attaching a coil core assembly to the stator members and in magnetic circuit therewith.

REFERENCES:
patent: 3949251 (1976-04-01), Takatsuki
patent: 3978651 (1976-09-01), Yoshino
patent: 4795930 (1989-01-01), Schwartz et al.

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