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. 02, 1990
Filed:
Apr. 27, 1989
Ronald R Wierszewski, Henrietta, NY (US);
Richard F Scarlata, Rochester, NY (US);
Thomas Acquaviva, Penfield, NY (US);
James F Matysek, Fairport, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A vacuum corrugation feeder stack height detection calibration system and method includes placing a single document in the document tray. Coupled to the stack height arm at the pivot point is a high resolution rotary encoder and dual beam sensor. The stack height arm is flipped up and then back down onto the document and pulses are counted. This difference in up and down pulses represents the 'one sheet case.' Software then stores this number in non-volatile memory and uses it to create a table of values for various document stack heights by adding constant values to the originally obtained 'one sheet case' value.