Photocopying – Contact printing – Light boxes
Patent
1992-06-12
1993-07-06
Braun, Fred L.
Photocopying
Contact printing
Light boxes
G03G 2100, G03G 1500, G03G 1300
Patent
active
052258777
ABSTRACT:
A control method and apparatus for tracking an endless belt. The tracking apparatus includes a roller and a belt steering roller. A span of the belt defined between the roller and the belt steering roller travels in a plane and both the roller and the belt steering roller are adapted for rotational movement about longitudinal axes perpendicular to the plane. The belt steering roller is also capable of a tilting movement through a midpoint of the belt steering roller in a soft tilt axis intersecting the longitudinal axis. A tilting mechanism including a solenoid and a spring controls movement of a yoke for tilting the steering roller about the soft tilt axis to either a positively tilted position relative to the plane or to a negatively tilted position relative to the plane. An optical sensor senses the lateral position of the belt and produces an electrical signal representing the lateral position. The electrical signal is analyzed and a first and a second time period are determined, these first and second time periods form a time duration ratio for keeping the steering roller at the negatively and positively tilted positions. A microprocessor control activates the tilting mechanism to move the steering roller to one of the two predetermined positions based on the electrical signal for the first time period. Subsequently, the tilting mechanism is activated to move to the other position after elapse of the first time period. The steering roller remains at the other position for the second time period.
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Braun Fred L.
Xerox Corporation
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