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:
Mar. 10, 1981
Filed:
Dec. 31, 1979
Applicant:
Inventors:
Masami Ishikawa, Katsuta, JP;
Hirochika Okano, Katsuta, JP;
Shigenobu Katagiri, Katsuta, JP;
Mitsugu Asano, Katsuta, JP;
Toshiaki Fujieda, Katsuta, JP;
Assignee:
Hitachi Koki Company Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B41J / ; H01H / ; B41J / ;
U.S. Cl.
CPC ...
101 9329 ; 323280 ; 361187 ; 4001572 ;
Abstract
An improved printing magnet drive device for use in a printing apparatus, such as line printer, is disclosed. The improvement comprises a constant voltage control means in which an output terminal voltage of a transistor is compared with a reference voltage and the comparison result is fed back to the transistor so as to control the output terminal voltage of the transistor to a predetermined value, whereby the voltage applied to the printing magnets is substantially maintained unchanged.