Photocopying – Contact printing – Light boxes
Patent
1993-07-13
1996-03-12
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355309, G03G 1516
Patent
active
054990866
ABSTRACT:
A belt-type transfer device which includes an endless belt rotating in contact with a photosensitive drum, with the belt being electrically charged by a corona discharger in a region of contact between the belt and the drum. A plate is provided for shielding the belt from the corona discharging in a vicinity of an outlet of the contact area to reduce electrostatic traction forces between the drum and the sheet in a vicinity of the outlet. The corona discharger may be located near an inlet of the region of contact with respect to a center thereof or a dielectric or electrically conductive film may be provided on an inner surface of the corona discharger on the contact area outlet side to increase the electrical charge of the belt at the inlet and the central portion of the region of contact. A control system detects an electric resistance value of the sheet and changes the corona discharging intensity in accordance with a detected value to stabilize an electrical charge of the belt or, a control system may be provided for slightly lowering a moving speed of the sheet as compared with a rotational speed of the drum at an outlet of the region of contact. Surface roughness of the belt is 5 .mu.m or less and the sheet delivery guides are provided having a volume resistivity of 10.sup.11 .OMEGA.cm or less, which reduces electrical charge caused on the sheet due to frictional contact.
REFERENCES:
patent: 4864363 (1989-09-01), Shinada
patent: 4984024 (1991-01-01), Ohkaji et al.
patent: 5144383 (1992-09-01), Murano et al.
patent: 5250999 (1993-10-01), Kimura et al.
patent: 5268724 (1993-12-01), Koizumi et al.
patent: 5283116 (1994-02-01), Tomari et al.
patent: 5291253 (1994-03-01), Kumasaka et al.
Matsuno Jun-ichi
Miwa Masato
Obata Shigeru
Takuma Yasuo
Uno Kazuo
Grimley A. T.
Hitachi , Ltd.
Hitachi Koki Co,. Ltd.
Lee Shuk Y.
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