Metal working – Method of mechanical manufacture – Electrical device making
Patent
1994-03-28
1996-08-27
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
72332, 72348, 310 42, 310 49R, 310263, H02K 1502
Patent
active
055488854
ABSTRACT:
A method of forming a stator for a stepping motor, including the steps of forming comb teeth by cutting a flat section of a plate having a cylindrical section around the flat section and bending the comb teeth up to a first angle. Next, the comb teeth are bent up to a second angle larger than the first angle and the thickness of the comb teeth is reduced so as to render uniform the thickness of all the comb teeth. Then, the cylindrical section is subjected to a drawing process at least one time. Finally, the comb teeth are bent up to a right angle. As a result, the occurrence of cambers in the comb teeth is eliminated and the comb teeth are not inclined in the peripheral direction. Also, the accuracy with which the comb teeth are bent to a right angle can be improved thereby.
REFERENCES:
patent: 1728033 (1929-09-01), Blake et al.
patent: 4418471 (1983-12-01), Torii et al.
Patent Abstracts of Japan, vol. 7, No. 107, published May 11, 1983, which is an English Abstract of Japanese Patent Nos. 58-29351, 58-29350, published Feb. 21, 1983.
Canon Kabushiki Kaisha
Canon Seiki Kabushiki Kaisha
Hall Carl E.
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