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:
Apr. 12, 1977
Filed:
Aug. 19, 1975
Robert L Wirth, Ithaca, NY (US);
David W Bell, Ithaca, NY (US);
NCR Corporation, Dayton, OH (US);
Abstract
A matrix print wire solenoid actuator for a high speed wire matrix printer is disclosed wherein a small diameter print wire is propelled against printing paper and ribbon by the linear motion of the solenoid plunger, to which the print wire is attached, in an improved impact printer having one or more in number and variously arranged print wires for use in dot matrix printing. High magnetic circuit efficiency, high repetition rate and minimized plunger coil heating and plunger mass are achieved by providing a continuous magnetic flux path through the solenoid interrupted only by two working air gaps of low reluctance for generating accelerating force on the plunger during coil energization. The opposing air gap surfaces formed by the plunger and solenoid pole pieces are conical for insuring that both air gaps generate accelerating force on the plunger.