Over-platen document registration apparatus

Details Over-platen document registration apparatus Over-platen document registration apparatus

1981-10-19

1983-07-05

Braun, Fred L.

Photocopying

Including fiber optics

271259, 355 3SH, 355 75, G03G 1504

Patent

active

043915051

ABSTRACT:
In an original document sheet feeding 10 and registration apparatus for a copier 12, in which a document sheet 14 is fed with a document feeding belt 11 over the imaging station 16 of the copier, the imaging station having a copying lens 20 in an integrating optical cavity 22 under the platen 16, document registration is provided on the platen 16 without impacting the document edge, using at least one minor spectrally reflective patch 38, 44, 54 on the otherwise diffusely light reflective surface 37 of the document belt 11, and feeding the document sheets onto the belt 11 in synchronism with the spectral patches with an edge of the document partially overlying a patch, and detecting the edge of the document sheet over the platen and within but off-axis the field of view of the copier lens 20 with a photosensor system 30, 46 which is in the optical cavity but optically invisible to the copier and aimed at a registration position 21, 46 on the platen for detecting the change there in the light level from a separate sensor light source 32, 40 reflected from a spectral patch relative to a partially overlying (diffusely reflective) document, even though both the belt and document are "white".

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