Material advance tracking system

Details Material advance tracking system Material advance tracking system

B - Operations, Transporting

41

L

B41L 21/00 (2006.01) B41F 21/00 (2006.01) B41J 11/42 (2006.01) B41L 5/00 (2006.01) B65H 23/04 (2006.01) B65H 23/188 (2006.01)

Patent

CA 2308360

The friction drive system (10) for printing, plotting or cutting graphic images on strip material (12) includes a feedback for a drive motor (40) driving a plurality of friction wheels (34, 36) for advancing strip material (12) in a longitudinal direction. The feedback signal comprises a short-term response component and a long-term response component to accurately pinpoint the exact longitudinal location of the strip material (12). The short-term response component is generated by comparing a motor encoder signal from a motor encoder (44) secured to the drive motor (40) with a commanded longitudinal position of the strip material (12) and passing the resultant differential error signal through an all pass filter (78). The long-term response component is generated by comparing a detecting encoder signal from a detecting encoder (54) secured to a device detecting the actual longitudinal position of the strip material (12) with the commanded longitudinal position of the strip material (12) and passing the differential error signal through a low pass filter (76).

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