The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 05, 1991
Filed:
Nov. 25, 1987
Applicant:
Inventors:
Akira Orii, Tokyo, JP;
Haruhisa Watanabe, Tokyo, JP;
Assignee:
Janome Sewing Machine Co. Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318696 ; 318685 ;
Abstract
In a four-phase stepping motor driving apparatus phase-A and phase-A, or phase-B and phase-B are prevented from simultaneously becoming conductive. A device for this includes a change-over circuit which validates either of the phase-A and the phase-A, a change-over circuit which validates either of the phase-B and the phase-B, a change-over circuit which renders both the phase-A and the phase-A conductive or nonconductive and a change-over circuit which rendered both the phase-B and the phase-B conductive or nonconductive.