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:
May. 03, 1977
Filed:
Oct. 21, 1975
Richard S Quaif, Dryden, NY (US);
John D Hays, Ithaca, NY (US);
NCR Corporation, Dayton, OH (US);
Abstract
A matrix printer hammer repetition rate control is disclosed for varying the print hammer repetition rate in accordance with printing speed, thereby maintaining constant width of printed characters without dot column sensing. A master clock is counted over each character period to generate a digital code which, after conversion to an analog signal, serves as the control voltage for a voltage controlled oscillator. The VCO output is a variable clock from which the timing for various print heads is derived. Printing data is gated to the hammer drive circuits at a variable rate proportional to the speed of the printing heads across a printing medium.