Photocopying – Contact printing – Light boxes
Patent
1989-11-16
1991-04-16
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355208, 355243, 355311, G03G 1504, G03G 2100
Patent
active
050087126
ABSTRACT:
This invention relates to a copying apparatus with variable magnification capability, wherein the reduced and enlarged copying operations are achieved by varying the speed of a photosensitive drum, while controlling an optical system. The size of a copying material is compared with the size of a reproduced image at a selected magnification, and the comparison is displayed. Also, the size of copy material and the selected magnification can be changed during an interrupt process, and the scanning stroke and timing for image formation are controlled differently for different magnifications. The size of a copying material is compared with the size of a reproduced image at a selected magnification, and the comparison is displayed. Also, the size of copy material and the selected magnification can be changed during an interrupt process, and the scanning stroke and timing for image formation are controlled differently for different magnifications. the optical system is moved to a determined position for a selected magnification and an error signal is generated when the optical system does not arrive at the determined position within a predetermined time after the selected magnification is input by the operator. The image forming cycle is stopped or inhibited in response to generation of the error signal.
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Inuzuka Tsuneki
Maeshima Katsuyoshi
Tomosada Masahiro
Braun Fred L.
Canon Kabushiki Kaisha
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