Photocopying – Contact printing – Light boxes
Patent
1991-05-20
1996-07-02
Barlow, Jr., John E.
Photocopying
Contact printing
Light boxes
355311, 283901, G03G 1500
Patent
active
055327893
ABSTRACT:
The image forming apparatus, in forming an image on the blank surface of a recording paper the one-side surface of which has an image already formed thereon for the purpose of promoting further utilization of the recording paper, forms on the aforementioned one-side surface of the recording paper a mark indicating unnecessariness of the image already formed on the one-side surface. This apparatus is provided with a marking unit capable of inscribing on the used surface having an unnecessary image recorded thereon a mark indicating unnecessariness of this image. This marking unit is actuated only when the fact that the reverse surfaces of recording papers have unnecessary image information already recorded thereon is detected, when the fact that the particular one of a plurality of paper feeding trays which accommodates used recording papers has been designated is detected, or when recording papers have been supplied from the paper feeding tray accommodating used recording papers. The choice between setting a marking mode in which the mark is printed by the marking unit on the reverse surface and canceling this mode is made by a selection switch.
REFERENCES:
patent: 3940210 (1976-02-01), Donohue
patent: 4573409 (1986-03-01), Clar et al.
patent: 4609283 (1986-09-01), Murata et al.
patent: 4973036 (1990-11-01), Yamashita et al.
patent: 5051779 (1991-09-01), Hikawa
Yaginuma Shigeru
Yamamoto Jun-ichi
Barlow Jr. John E.
Minolta Camera Kabushiki Kaisha
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