Patent ID: 7545519
Filing Date: 2009-06-09
Classification: B41J,B65H,G01B,G03G

Abstract:
1. A lead edge sheet curl sensor apparatus, comprising: a transport media sheet substrate path, wherein said transport media sheet substrate path is a path of a media sheet substrate with zero curl; a first light emitter and a second light emitter aligned with said first emitter, wherein light beams emitted from said first light emitter and said second light emitter cross one another; a first light detector aligned to receive said light beams from said first light emitter in association with a second light detector wherein said second light detector is aligned to receive said light beams from said second light emitter; and a timing device, wherein said first and second light detectors provide output signals representative of interruptions of said light beams by said media sheet substrate to said timing device thereby providing for a lead edge sheet curl sensor apparatus.