Lead edge paper curl sensor

Details Lead edge paper curl sensor Lead edge paper curl sensor

B - Operations, Transporting

41

F

B41F 33/02 (2006.01) B41F 21/00 (2006.01) B41L 21/00 (2006.01) G03G 15/00 (2006.01)

Patent

CA 2435403

A sheet curl measurement system and method and an automatic sheet decurling system controlled thereby for the printed paper sheets output of printer. The sheet curl may be remotely sensed without contacting or interfering with the motion of the sheets in their normal sheet path, using a simple but accurate optical sheet curl sensor operating on a portion of the moving sheet at an angle thereto and perpendicularly thereto, with displacement insensitive optics, in both an angular direction substantially parallel to the sheet movement direction and an angular direction substantially transverse to the sheet movement direction, with ratioing of the two output signals.

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