Shutter calibration and document size detection

Details Shutter calibration and document size detection Shutter calibration and document size detection

1989-06-22

1990-05-08

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Detailed holder for original

355309, 355311, 355316, 356400, 250206, 271265, G03G 1500

Patent

active

049242628

ABSTRACT:
An apparatus in which shutters used to occlude the region of the platen not supporting the original document being reproduced are calibrated. After the fully open position of the shutters is determined, the size of each original document being reproduced may be determined. In calibrating the shutters, an original document having a predetermined size is positioned on the platen with one set of perpendicular edges thereof being located at a registration position. The shutters are moved from the fully open position to another set of perpendicular edges of the document. The distance that the shutters move between the open position and the edges of the document is measured. With this information, the distance between the open position and the registration position may be determined as a function of the size of the original document and the distance that the shutters move. After the location of the open position of the shutters has been calibrated, the size of other original documents may be determined. The original document of unknown size is positioned with one set of perpendicular edges thereof located at the registration position on the platen. The shutter is moved from the open position to the other set of perpendicular edges of the original document. The distance that the shutter moves from the open position to the edges of the document is measured and the size of the document calculated as a function of the shutter distance moved and the calibrated distance between the open position and the registration position.

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