Automatic copier show-around erase system

Details Automatic copier show-around erase system Automatic copier show-around erase system

1986-09-16

1988-05-17

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14E, 355 55, G03G 2100

Patent

active

047454385

ABSTRACT:
A 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 with a variable magnification optical imaging system, 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, 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 array of sensors is adjacent the platen and in the document path from both of the document sheet inputs to the platen. The fade-out system is further responsive to the actual size of the copy sheets on which copies are being made, for automatic flood illumination 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.

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