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:
Aug. 20, 1991
Filed:
Sep. 12, 1989
Applicant:
Inventor:
Shigeki Mizuno, Suwa, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
400124 ; 101 9305 ;
Abstract
An impact dot print head for driving a printing wire is provided. An armature has a printing wire mounted at one end and is attached to a leaf spring at its other end. A ring-shaped primary magnet provides a magnetic force for maintaining the armature in a stand-by condition. A plurality of coil electromagnets provided for each respective armature. The coil magnets form a ring having an inner circumference. A ring-shaped magnetic member is provided within the diameter of the ring formed by the coil electromagnets to reduce the magnetic interference between adjacent electromagnetic coils during driving of the printing wires.