Photocopying – Contact printing – Light boxes
Patent
1988-05-17
1990-07-03
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355290, 355309, 271900, G03G 1520, G03G 2100
Patent
active
049395505
ABSTRACT:
An electrostatic photographic apparatus includes a photosensitive drum and a fixing device composed of a pair of rollers pressure-contacted with each other over a predetermined nip width, in which a toner image formed on the photosensitive drum is transferred onto a lower surface of a transfer paper transported over an upper portion of the photosensitive drum while contacting therewith and is fixed by a nip portion of the rollers of the fixing device, an inlet end of the nip portion is disposed on a curve of a cross section of the transfer paper when the latter is warped with a radius of curvature smaller than a radius of curvature of cross section of a transfer paper having stiffness smallest among other transfer papers usable in the apparatus when the transfer paper of the smallest stiffness is supported at its rear end horizontally at a point at which the transfer paper leaves the photosensitve drum while allowing the other portion thereof to be drooped freely by gravity, a tangential line of the rollers at a center of the nip portion being substantially coincident with a tangential line of the curve, and guide member having a lower guide surface convexed upwardly is arranged along the curve between the separating point of the transfer paper from the photosensitive drum and the inlet end of the nip portion.
REFERENCES:
patent: 3774907 (1973-11-01), Borostyan
patent: 3914041 (1975-10-01), Opravil
patent: 4752801 (1988-06-01), Kando
Aoki Hideo
Okamoto Keiji
Shimazaki Toshio
Takada Hiromi
Grimley A. T.
Pipala E.
Ricoh & Company, Ltd.
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