G - Physics – 03 – G
Patent
G - Physics
03
G
314/7
G03G 21/00 (2006.01) G03G 15/047 (2006.01)
Patent
CA 1289613
ABSTRACT OF THE DISCLOSED EMBODIMENT An improved fade-out system for a copier with a document feeder, for preventing the undesired development of areas of the photosensitive imaging surface relative to the desired latent images of the document thereon, especially with a variable magnification optical imaging system, the improvement particularly in preventing "show around" copy defects from the document feeder, where the document feeder transports the document sheets in a document path onto and over the copying platen of the copier, an array of plural document sensors is positioned in the document feeder for measuring both the length and width of the document sheets being transported onto the copying platen of the copier, and the fade-out system connects with and is controlled by both the array of plural document sensors and the magnification setting of the optical imaging system for preventing development of any areas of the photosensitive imaging surface outside of the latent images of the documents irrespective of the size of the document sheets or the magnification setting. The disclosed document feeder is a part of a document handler with two separate document sheet inputs for either recirculating a stack of document sheets or semiautomatically feeding larger document sheets, and the array of sensors is adjacent the platen and in the document path from both of the document sheet inputs to the platen. The disclosed fade-out system provides automatically variable area flood illumination of the photosensitive imaging surface. The disclosed fade-out system further is responsive to the actual size of the copy sheets on which copies are being made, for automatically preventing development of areas of the photosensitive imaging surface outside of the smaller of the two of the document latent image area or the actual copy sheet size,by fading out any portions of the document latent image area which will not be engaged for image transfer by the copy sheet, and fading out otherwise developable nondocument latent image areas of the photosensitive imaging surface even if they are within areas of the photosensitive imaging surface which will be engaged by the copy sheets, so as to provide complete fade-out for any selected magnification or document size or copy size even if the document latent image area is smaller than the copy sheet or the copy sheet is smaller than the document latent image area, to prevent either "show- around" copy defects or undesirable development of portions of the document latent image area which cannot be transferred to the copy sheet. The disclosed fade-out system can further automatically provide an additional preset fade-out of approximately 2 mm of at least one outer edge of the document latent image area to eliminate any latent images of any shadows of the document sheet edge.
542856
Acquaviva Thomas
Schaeffer Donald W.
Sim & Mcburney
Xerox Corporation
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