Stepping motor and frame plate assembly for a wristwatch

Details Stepping motor and frame plate assembly for a wristwatch Stepping motor and frame plate assembly for a wristwatch

G - Physics

04

C

58/11

G04C 3/12 (2006.01) G04C 13/11 (2006.01) H02K 1/18 (2006.01) H02K 5/128 (2006.01) H02K 37/16 (2006.01)

Patent

CA 1280898

STEPPING MOTOR AND FRAME PLATE ASSEMBLY FOR A WRISTWATCH MOVEMENT ABSTRACT OF THE DISCLOSURE A wristwatch movement has a Lavet stepping motor directly driving a center wheel attached to the minute hand. The frame plate of the movement is of non-magnetic plastic material with recesses locating the pole shoes of two stator members of the stepping motor. An integral plastic cylindrical wall extends from the recess. The stepping motor rotor is rotatably supported within the wall by a journal at one end in the frame plate and at the other end by a cap. The stator pole faces are accurately spaced from the rotor by the wall and held in place by deforming plastic material against the stator pieces toward the wall.

530768

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