Apparatus and method for lateral belt control with backlash comp

Details Apparatus and method for lateral belt control with backlash comp Apparatus and method for lateral belt control with backlash comp

1994-08-29

1996-05-07

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

198807, 2425341, G03G 1500, B65G 3916

Patent

active

055151396

ABSTRACT:
An apparatus and method for controlling lateral movement of a belt supported on two or more rollers in an electrophotographic printing machine. The belt is rotated for several revolutions and the actual profile of the belt edge is sensed and stored. A steering roll is then tilted at an angle large enough to overcome any steering system backlash and the belt drift rate is measured. Incremental steering adjustments are then made in the opposite direction until the belt drift rate reverses direction. The steering system backlash is then determined as a function of the incremental angle (which is a known number of steering motor steps) and the number of corrective steering changes made. The backlash for the system in the opposite direction is then determined in the same manner. Steering corrections to the belt are then made with compensation for backlash so that the steering system is more responsive.

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