Photocopying – Contact printing – Light boxes
Patent
1994-05-12
1995-11-28
Beatty, Robert
Photocopying
Contact printing
Light boxes
355 30, 355215, G03G 2120
Patent
active
054712807
ABSTRACT:
A developing unit, an image-transfer unit and a fixing unit are located in that order in a vertically long housing from the bottom to the top of the housing, and a ventilation passage different from a sheet conveying passage, is formed having an inlet opening formed in the bottom part of the housing and the outlet opening formed in the top part of the housing and extending by way of the developing unit, the image-transfer unit and the fixing unit. Air in the ventilation passage is warmed up by extra heat from the fixing unit so as to induce an ascending air stream which expels NOx and ozone generated by corona discharge and which cools the fixing unit. With this arrangement, the necessity of a ventilating fan can be eliminated so as to miniaturize the electrophotographic printing apparatus and to reduce the cost while eliminating noise caused by a ventilating fan.
REFERENCES:
patent: 4073587 (1978-02-01), Selwyn
patent: 5087943 (1992-02-01), Creveling
patent: 5134960 (1992-08-01), Shirai
patent: 5187525 (1993-02-01), Fushimi et al.
patent: 5216467 (1993-06-01), Esser et al.
patent: 5315354 (1994-05-01), Mordenga
Beatty Robert
Matsushita Electric - Industrial Co., Ltd.
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