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    AUTOMATIC COPIER SHOW-AROUND ERASE SYSTEM
    5.
    发明专利
    AUTOMATIC COPIER SHOW-AROUND ERASE SYSTEM 未知

    公开(公告)号：CA1289613C

    公开(公告)日：1991-09-24

    申请号：CA542856

    申请日：1987-07-23

    Applicant: XEROX CORP

    Inventor： ACQUAVIVA THOMAS ,  SCHAEFFER DONALD W

    IPC: G03G15/04 ,  G03G15/00 ,  G03G15/043 ,  G03G15/047 ,  G03G21/00

    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 "showaround" 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.

    HIGHER PRODUCTIVITY RECIRCULATIVE DOCUMENT COPYING
    6.
    发明专利
    HIGHER PRODUCTIVITY RECIRCULATIVE DOCUMENT COPYING 未知

    公开(公告)号：CA1208689A

    公开(公告)日：1986-07-29

    申请号：CA435724

    申请日：1983-08-31

    Applicant: XEROX CORP

    Inventor： PELS SUSAN J ,  SCHAEFFER DONALD W

    IPC: B65H83/00 ,  G03G15/00 ,  G03G15/23 ,  G03G21/00 ,  G03G21/02 ,  G03G13/00

    Abstract: In recirculatively precollatively copying a set of plural original documents onto both sides of copy sheets to produce a desired plural number precollated duplex copy sheet sets, by normally copying the documents only once in each copying circulation of the document set onto one side of copy sheets to form a duplexing buffer and copying other documents onto the opposite sides of the buffer copies to form duplex precollated copies, the improvement comprising: counting the number of documents in the document set and determining that the number of documents is only two or three, and in response to the determination, automatically switching the mode of copying of the documents to a higher productivity two or three document set mode in which plural identical consecutive copies are first made from only one document (the first document page) by halting the first copying circulation of the document set to copy only the one document, and forming the buffer from these plural identical copies and then skipping the copying of the same one document in the subsequent production of a number of copy sheet sets corresponding to the number of the plural identical copies. If the determined number of documents is two, the number of plural identical copies made is equal to the number of copy sets made, but not more than 14, and the document set is circulated not more than three times for up to 14 copy sets. If the determined number of documents is three, the plural number of identical plural copies made is four, and all documents other than the first document copied are copied only once in each document set circulation.

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