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:
Jul. 29, 1980
Filed:
Apr. 02, 1979
Stanley J Blanchard, Danbury, CT (US);
Unimation Inc., Danbury, CT (US);
Abstract
The disclosed forms of shaft-position encoder employ 'fast' and 'slow' rotary selectors coupled by gearing to each other and to the shaft whose position is to be encoded. The selectors cooperate selectively with elements in respective 'fast' and 'slow' circular series of elements. Two counters register the number of pulses in respective pulse trains, the number of pulses in a train varying in accordance with the number of elements in each of the 'fast' and the 'slow' series between one end of the series and an element in cooperation with a related selector. The combined values registered in the counters represents the shaft position code. The inherent uncertainty in recognizing when the 'slow' counter should register any particular value represented by the position of its selector along its series of elements could create significant ambiguity, which is here resolved through use of the value registered in the counter of the 'fast' series of elements.