Image transferring device for image forming equipment

Details Image transferring device for image forming equipment Image transferring device for image forming equipment

1995-05-24

1997-06-17

Beatty, Robert

Electrophotography

Image formation

Transfer

G03G 1516

Patent

active

056406606

ABSTRACT:
An image transferring device incorporated in an image forming apparatus and capable of surely preventing a sheet from wrapping around a photoconductive element and from being incompletely separated from a transfer belt. A transfer bias and discharge are effected to prevent changes in the resistances of the transfer belt and sheet ascribable to changes in environment from translating into changes in a current to flow to the photoconductive element, and to efficiently dissipate a charge deposited on the belt. Various members constituting the device are positioned relative to one another such that the discharging effect is achievable most effectively while preventing the transfer bias from causing dielectric breakdown in any constituent part. For example, if a discharge member is spaced from a transfer electrode by L.sub.3 and if the transfer electrode is spaced from a nip portion between the transfer belt and image bearing member by a distance L.sub.2, than L.sub.3 .gtoreq.L.sub.2. Additionally, if the vokage applied to the transfer electrode is V.sub.O, than L.sub.2 .gtoreq.a.vertline.V.sub.O .vertline., where a is 1.0 (mm/kv); if a distance between the nip and an upstream roller entraining the belt is L.sub.1, than L.sub.1 .gtoreq.a.vertline.V.sub.O .vertline.; and if the distance between to discharge members is L.sub.4, the transfer belt has a time constant of .tau., and a process speed is .nu., than .tau..ltoreq.L.sub.4 /.nu.. Finally, the transfer belt has a double layer structure made up of an outer layer having a surface resistivity of 1.times.10.sup.9 to 1.times.10.sup.12 .OMEGA. and an inner layer having a surface resisitivity of 8.times.10.sup.6 to 8.times.10.sup.8 .OMEGA. and a volume resisitivty of 5.times.10.sup.8 to 5.times.10.sup.10 .OMEGA.cm.

REFERENCES:
patent: 3647292 (1972-03-01), Weikel, Jr.
patent: 3830589 (1974-08-01), Allen
patent: 3832053 (1974-08-01), Goel et al.
patent: 4162843 (1979-07-01), Inoue et al.
patent: 4220699 (1980-09-01), Ishida et al.
patent: 4268157 (1981-05-01), Ebi et al.
patent: 4407580 (1983-10-01), Hashimoto et al.
patent: 4411977 (1983-10-01), Tarumi et al.
patent: 4916547 (1990-04-01), Katsumata et al.
patent: 4931839 (1990-06-01), Tompkins et al.
patent: 4984024 (1991-01-01), Ohkaji et al.
patent: 5040028 (1991-08-01), Kamimura et al.
patent: 5053827 (1991-10-01), Tompkins et al.
patent: 5138363 (1992-08-01), Yuge
patent: 5140376 (1992-08-01), Gotoda et al.
patent: 5148224 (1992-09-01), Yamada et al.
patent: 5153653 (1992-10-01), Fuma et al.
patent: 5172173 (1992-12-01), Goto et al.
patent: 5182598 (1993-01-01), Hara et al.
patent: 5189479 (1993-02-01), Matsuda et al.
patent: 5198863 (1993-03-01), Goto et al.
patent: 5268725 (1993-12-01), Koga et al.
patent: 5291253 (1994-03-01), Kumasaka et al.
patent: 5300984 (1994-04-01), Fuma et al.
patent: 5386274 (1995-01-01), Sanpe et al.

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