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:
Mar. 27, 2001
Filed:
May. 13, 1999
Leonard G. Rich, West Hartford, CT (US);
Ronald B. Webster, Ellington, CT (US);
Mark E. Guckin, Middletown, CT (US);
Gerber Scientific Products, Inc., Manchester, CT (US);
Abstract
The friction drive system for printing, plotting or cutting graphic images on strip material includes a feedback for a drive motor driving a plurality of friction wheels for advancing strip material in a longitudinal direction. The feedback signal includes a short-term response component and a long-term response component to accurately pinpoint the exact longitudinal location of the strip material. The short-term response component is generated by comparing a motor encoder signal from a motor encoder secured to the drive motor with a commanded longitudinal position of the strip material and passing the resultant differential error signal through an all pass filter. The long-term response component is generated by comparing a detecting encoder signal from a detecting encoder secured to a device detecting the actual longitudinal position of the strip material with the commanded longitudinal position of the strip material and passing the differential error signal through a low pass filter.