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. 12, 1994
Filed:
Feb. 25, 1993
Applicant:
Inventors:
John W Fraser, Dayton, OH (US);
Curtis Woods, Centerville, OH (US);
Assignee:
Ohio Electronic Engravers, Inc., Dayton, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05D / ;
U.S. Cl.
CPC ...
318603 ; 318632 ;
Abstract
A leadscrew driving arrangement which is corrected to eliminate the effect of pitch errors. The leadscrew is mapped to create a table of differences between the leadscrew angular position and the corresponding angular position of a perfect leadscrew which has been advanced the same axial distance. The differences are used to create a correction table which is stored in a PROM. During operation of the leadscrew, the correction table is used to adjust the leadscrew driving signal.