US 7,254,358 B2Granted

Color image forming apparatus

AssigneeKonica Minolta Business Technologies, Inc.

InventorsTakenobu Kimura, Yotaro Sato

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Abstract

A color image forming apparatus includes plural developing units that respectively form toner images of different colors on plural photoreceptors, plural primary transferring devices that successively transfer each of the toner images of the plural photoreceptors onto an intermediate transfer belt, which holds a color toner image transferred and superimposed by primary transfer, a secondary transferring device that transfers concurrently the color toner image onto a transfer material, a drive roller that drives the intermediate transfer belt and that is placed between one of the plurality of primary transferring devices which is arranged on the most downstream side in the direction of movement of the intermediate transfer belt and the secondary transferring device, and a controller that controls a discharger discharging the color toner image and the drive of the drive roller.

Claims3

Dependent claims

A color image forming apparatus for forming a color image, comprising:

(a) a plurality of photoreceptors each for carrying a toner image having a color different from each other;
(b) a plurality of developing devices each for forming each of the color toner images on each of the plurality of photoreceptors;
(c) a plurality of primary transferring devices each for primary transferring each of the toner images successively onto an intermediate transfer belt;
(d) a intermediate transfer belt for carrying a color toner image which has been primary transferred and superimposed;
(e) a secondary transferring device for secondary transferring concurrently the color toner image onto a transfer material;
(f) a drive roller provided between one of the plurality of primary transferring devices which is arranged on the most downstream side of the intermediate transfer belt in a moving direction thereof and the secondary transferring device, and inside the intermediate transfer belt for driving the intermediate transfer belt;
(g) a discharger provided facing the drive roller for discharging the color toner image on the intermediate transfer belt;
and
(h) a controller for controlling the discharger and a drive of the drive roller,
wherein the controller operates the discharger at least from a start time of the primary transferring to a completion of the secondary transferring.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/183,596Filed 18 Jul 2005
Priority: JP 2004-3203144 Nov 2004
Published: US 2006/0093408 A14 May 2006
Granted: 7 Aug 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G03G 15/161
Using at least one intermediate support: with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
G03G 15/1605
Of a toner pattern, e.g. a powder pattern , e.g. magnetic transfer: using at least one intermediate support
G03G 2215/1623
Main transfer electrode: transfer belt
G03G
Electrography