Photocopying – Contact printing – Light boxes
Patent
1990-09-19
1991-06-11
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355282, 355284, 355285, G03G 1522, G03G 1520
Patent
active
050234641
ABSTRACT:
In a heat roll consisting of a mandrel and a surface layer, this invention comprises a fixing apparatus and a recording apparatus, wherein a thickness of the surface layer is formed not exceeding the thickness determined by a square root of the product of a heat diffusion rate of the surface material and a nip time required for a form to pass a nip zone, and a thickness of the mandrel is formed not less than the thickness determined by a square root of the product of a heat diffusion rate of the mandrel material and a one rotational period of the mandrel. Since the surface layer and the mandrel are so specified for the thickness as mentioned, a quantity of heat flowing from the mandrel into the surface layer multiplies, and thus a high fixing strength is obtainable. The fixing apparatus and the recording apparatus are provided further with a cleaning device high in cleaning capacity.
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Endou Michio
Fujiwara Shigetaka
Mitsuya Teruaki
Terakado Akira
Grimley A. T.
Hitachi , Ltd.
Hitachi Koki Co,. Ltd.
Hoffman Sandra L.
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