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:
Dec. 05, 1978
Filed:
May. 11, 1977
Evan L Ragland, III, Atherton, CA (US);
Periphonics Corporation, San Carlos, CA (US);
Abstract
Printing apparatus uses a daisy type print wheel which is continuously driven through a magnetic clutch arrangement. Characters are selected by actuation of either an electromagnetic brake acting on the print wheel or a toothed character selector acting on the spokes of the print wheel. When a character is selected and the print wheel is stopped, rotation of the motor continues because of the slippage of the magnetic clutch. Other features of the invention include a fast recovery time for the hammer because of its constant rate of actuation, a change in spacing by varying this constant rate and also an improved carriage scan technique which provides for fast return.