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. 03, 1984
Filed:
Jun. 07, 1982
Mitchell D Forcier, Vancouver, WA (US);
Other;
Abstract
A daisy wheel printer with a low mass carriage is driven by a pair of bidirectional stepping motors mounted on the printer frame. The carriage and print wheel are each driven by their respective motor through a belt and pulley drive extending side to side of the printer frame. The motors and pulleys are proportioned so that a step of either stepping motor rotates the print wheel from one character position to the next, thereby synchronizing print wheel rotation with carriage movement. The motors are driven independently, under control of a microcomputer in the printer, to vary the phase of rotation of the print wheel relative to movement of the carriage. Stops at one end of the printer frame are used to physically position the carriage and wheel to known initial locations. The microcomputer is programmed to electrically synchronize the motor controls to such locations and to track the positions of the print wheel and carriage when moving them from their initial locations, without using extrinsic position-sensing and control circuitry. The printer has a platen mounted on a rack which is pivotable by rotatable cams away from the print wheel to ease removal of the wheel and to optimally adjust the platen-to-wheel spacing for printing on papers of different thicknesses.