Two speed step motor driving apparatus for copying machines
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorYasufumi Tanimoto
Life of this patent
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Abstract
A pulse motor driving apparatus for the optical unit in a copying machine includes an excitation phase designating circuit for designating phase windings alternately from one phase to two phases and from two phases to one phase at the time of original scanning or forward rotation, and also designating the phase windings in pairs with every two phases at the time of return of the optical unit or reverse rotation. A drive circuit supplies drive pulses successively to the phase windings designated by the excitation phase designating circuit to rotate a pulse motor faster at the time of reverse rotation than at the time of forward rotation.
Claims6
An apparatus for driving a pulse motor provided with a plurality of windings, said pulse motor being used for scanning in a copying machine, said apparatus comprising:
- excitation phase designating means for selectively setting a document scanning mode and a return mode designating the phase windings alternately from one phase to two phases and from two phases to one phase in the document scanning mode, and successively designating the phase windings in pairs with every two phases in the return mode, the pulse motor being rotated faster in the return mode than the document scanning mode;
- and
- drive circuit means for suplying a drive pulse and drive pulses alternately to the one phase winding and two phase windings designated by the excitation phase designating means in the document scanning mode, and supplying drive pulses to the two phase windings designating by the excitation phase designating means in the return mode.
Dependencies are inferred from the claim text.