Plural belt document feeder with optimum optical properties

Details Plural belt document feeder with optimum optical properties Plural belt document feeder with optimum optical properties

1989-04-12

1990-02-20

Hix, L. T.

Photocopying

Projection printing and copying cameras

Detailed holder for original

355312, 271245, G03B 2764

Patent

active

049030744

ABSTRACT:
A document feeder is provided for presenting documents to the platen of a copier for copying with a vacuum belt platen transport system having document transporting belts movable under a substantially planar vaccum plenum backing. Also included is a vacuum system for applying a partial vacuum to a document sheet being transported by the movable belts over the platen. Show-through and show-around problems are reduced by optically mtching the belts and the plenum backing. In the preferred embodiment, the background surface is slightly roughend and made to be approximately 92% reflective to light during image exposure. The belts are composed of a urethane material which is approximately 16% transmissive but provides a 91% reflectance when moving along the plenum surface.

REFERENCES:
patent: 4008956 (1977-02-01), Stemmle
patent: 4294540 (1981-10-01), Thettu
patent: 4412738 (1983-11-01), Ahern et al.
patent: 4589652 (1986-05-01), Silverberg
patent: 4618138 (1986-10-01), Silverberg
patent: 4825255 (1989-04-01), Iaia, Jr. et al.

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