Fuji Xerox Co., Ltd.

Kouji Hamabe

Norio Ogawahara

Ryouichi Tsuruoka

Nobuo Hyakutake

Katsumi Harumoto

Jun Takagi

Osamu Handa

Yoshinari Iwaki

Takashi Fuchiwaki

Masato Serizawa

Shin Honda

Iwao Kuriki

Akira Ogita

Noriyoshi Kono

Takeshi Fukuda

Kunimasa Aoshima

Tsuyoshi Doubata

A collection vessel has a shutter for opening and closing collection ports . A rotation shaft of the shutter is provided with an opening/closing piece . The opening/closing piece abuts a protrusion on an image formation apparatus main unit and opens the shutter largely so that a discharge section inserted into the collection port does not abut. The collection port is made a long hole so as to allow the discharge section to move. Further, the shutter is formed integrally with a plurality of door parts so as to open or close the collection ports by one operation.

Image formation apparatus and developer collection vessel used therewith

In an image forming apparatus, such as an electrophotography-basis copying machine or laser printer, ribs are provided on and along both side ends of the inner surface of an intermediate transfer belt. Rib guides are provided on both ends of a drive roll. The ribs are brought into contact with the rib guides, whereby the intermediate transfer belt is guided. The diameter of each rib guide is slightly larger than the diameter of the drive roll, to thereby form a gap between the drive roll and the intermediate transfer belt. In a region including the gap and its vicinity, a friction created between the drive roll and the intermediate transfer belt is reduced. Therefore, thrust of each rib against each rib guide, caused by the walk, is reduced.

Image forming apparatus using an endless belt

The image forming apparatus according to the present invention forms a high quality color image with multiple colors of toner in accordance with an input signal. An electrostatic latent image is formed on an image carrier in accordance with the image signal. A developing bias is applied to the image carrier to form a toner image of the latent image for multiple toner colors. To transfer the toner image to an intermediate transfer belt, a rotatable transfer roller is positioned opposite the image carrier and across the transfer belt for attracting the transfer belt toward the image carrier at a transferring position. To reduce the frictional force between the image carrier and the transfer belt, which causes color deviation when multiple toner images are transferred to the intermediate transfer belt, a toner is placed on the image carrier in front of a leading end of a first toner image formed on the image carrier. The toner is applied to the transfer belt when the image carrier is in contact with the transfer belt and thus reduces the frictional force causing color deviation.

Image forming apparatus for high quality color images

A transfer apparatus is provided which is capable of effectively preventing a defect in transference caused from a gap between a transfer member and an intermediate transfer belt to form an excellent image free from an image defect such as whitening. The transfer apparatus for an image forming apparatus for primarily transferring a toner image formed on an image holding member to an intermediate transfer belt and then secondarily transferring the image, which has been primarily transferred onto the intermediate transfer belt, to a transfer member, includes a transfer unit for secondarily transferring the image having a transfer roll separably disposed on the surface of the intermediate transfer belt, which holds the toner image, and an opposite roll disposed to be in contact with the inner surface of the intermediate transfer belt at a position at which the opposite roll is opposite to the transfer roll. When the transfer roll has been brought into contact with the intermediate transfer belt, the central position of the transfer roll is disposed upstream with respect to the central position of the opposite roll in a direction in which the intermediate transfer belt is moved, and an angle made between a line connecting the center of the transfer roll and the center of the opposite roll to each other and the intermediate transfer belt is set to be smaller than 90.degree., and the intermediate transfer belt is deformed to have a shape along the transfer roll and the opposite roll.

Transfer apparatus for an image forming apparatus

In a recording sheet conveying device comprising: a dielectric sheet which moves at a predetermined speed while electrostatically retaining a recording sheet on the outer surface thereof; a charger positioned on the side of the inner surface of the dielectric sheet, to induce electrostatic attraction forces between the dielectric sheet and the recording sheet; and a deflector roll having an electrically conductive layer as an outer surface thereof, the deflector roll being confronted with the charger and adapted to push the recording sheet against the dielectric sheet, the number of electric charges provided by the charger is so adjusted that electrostatic attraction forces acting on the rear end portion of the recording sheet are weaker than those acting on the front end portion of the recording sheet, whereby the recording sheet is prevented from being wrinkled when electrostatically retained on the dielectric sheet.

Recording sheet conveying device

Growing community of inventors

Saitama, Japan

Kouji Hamabe