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:
Oct. 04, 1983
Filed:
Jun. 16, 1980
David A Hall, Austin, TX (US);
George P Olson, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In an impact printer including a print wheel having a plurality of selectable character type bearing elements for respectively printing a plurality of characters, said print wheel being rotatable for selectively positioning selected type elements in successive print positions, impact means impellable against the selected elements to drive said elements against the printing medium and means for impelling the impact means against said selected type element, the present invention provides the improvement comprising the combination of means for sensing the flight time of the impelled impact means until impact by sensing variations in the velocity of said impact means, means for comparing the sensed flight time to a predetermined ideal flight time, and means for selectively varying the amplitude of the current to the impelling means to adjust the sensed flight time to equal the ideal flight time.