STEPPING MOTOR AND FRAME PLATE ASSEMBLY FOR A WRISTWATCH

STEPPING MOTOR AND FRAME PLATE ASSEMBLY FOR A WRISTWATCH MOVEMENT 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 memb...

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Bibliographic Details
Main Author WUTHRICH, PAUL
Format Patent
LanguageEnglish
French
Published 05.03.1991
Edition5
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
DYNAMO-ELECTRIC MACHINES
ELECTRICITY
ELECTROMECHANICAL CLOCKS OR WATCHES
GENERATION
HOROLOGY
PHYSICS
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Summary:STEPPING MOTOR AND FRAME PLATE ASSEMBLY FOR A WRISTWATCH MOVEMENT 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.
Bibliography:Application Number: CA19870530768