Fuji Xerox Co., Ltd.

Sumitomo Electric Industries, Limited

Matsushita Electric Industrial Co., Ltd.

Mikio Kobayashi

Norio Hokari

Yukio Hayashi

Shuji Iseki

Ryoichi Tsuruoka

Junichirou Sameshima

Shikou Kodama

Nobuo Hyakutake

Satoshi Fukada

Yoshiaki Watanabe

Satoru Torimaru

Takashi Fuchiwaki

Takeo Seike

Makoto Ochiai

Tetsuaki Watanabe

Ryouichi Tsuruoka

Yuzo Tokumaru

Tomio Wada

Teruhiro Sato

Atsuhiro Ona

Takizo Sagawa

Hidemitsu Hisata

Hiroshi Ohzeki

Jyunichiro Sameshima

Kenji Tomizawa

Kimiyuki Tominaga

An image forming device has plural photoreceptor drums on which a latent image is formed, wherein one of the photoreceptor drum is different diameter from the other photoreceptors. A belt in contact with the plural photoreceptor drums and plural transfer rollers press the photoreceptor drums from a side of the belt, the side being opposite to the side contacts with the photoreceptor, wherein a distance from a contact reference position. The contact reference position at which the photoreceptor contacts with the belt, to a pressed position of the transfer roller of a large-diameter photoreceptor drum is greater than that of a small-diameter photoreceptor drum.

Image forming device

In a method for fusing splicing optical fibers having different diameters of fiber coating portions, the fiber coating portions of optical fibers to be spliced are clamped on V-groove boards and end faces of the optical fibers are aligned. Then, the end faces of the optical fibers are fused spliced by a discharged heating. An inclination angle &thgr;g of glass fibers of the fusion spliced optical fibers is measured from an observed image of a fusion splicing portion after fusion splicing the optical fibers to estimate a splice loss of the optical fibers.

Method for fusion splicing optical fibers

An image forming apparatus capable of minimizing local degradation of the image carrier and effectively preventing image defects due to resistance reduction and adhesion of release agent, without lowering productivity. The image forming apparatus includes an image making unit, having an image carrier, with plural image carrying regions, the image making unit adapted to cause the image carrying regions on the image carrier to carry images and then to transfer the images onto the sheet in a series of image making cycles, and an image making controller for controlling the image making unit according to job commands for making images. The image making controller includes a reference signal changing circuit for changing reference signal for each job, and the reference signal determines which of the image carrying regions on the image carrier should be an image writing position.

Image forming apparatus with reference signal changing circuit

An image forming apparatus includes a control unit for executing a control operation in which the photoreceptor drum is not to directly contacted with a divided holding region surface on the transfer belt onto which a transfer sheet fed again by the trayless device is held. In the control operation, the two-sided image formation is previously conducted on the transfer sheets, the number of which corresponds to the surplus number (2) obtained when the number (7) of transfer sheets of continuous two-sided image formation is divided by the number (5) of the divided holding regions (panels) on the transfer belt passing through a transfer position on the photoreceptor drum in a period of time from when a transfer sheet, onto the first image surface of which an image is formed, is held on the transfer belt to when the transfer sheet is fed again to the transfer belt via a transfer sheet conveyance passage of the trayless mechanism, and then the two-sided image formation is conducted on the residual number (7-2=5) of transfer sheets.

Two-sided image forming apparatus with oil contamination prevention

An endless belt type delivery device includes a drive roller, a plurality of driven rollers including a tension apply roller disposed in such a manner that the respective axial directions of the rollers are set parallel to each other, an endless belt wound around the respective rollers in such a manner that the endless can be driven by rotating the drive roller, and meandering adjusting means, provided in at least two of the above-mentioned rollers, for biasing contact pressures between the two or more rollers and the endless belt toward the axial-direction end portions of the rollers. The contact pressure between the rollers and the endless belt are biased in the opposite direction to the meandering direction of the endless belt by the meandering adjusting means, thereby being able to correct the meandering of the endless belt.

Endless belt type delivery device

In an optical detecting device, used for an image forming apparatus, for detecting an object to be detected, such as a paper, by an optical means including a light emitting means 20c, a photo sensing means 20d, a reflecting means 20b, and the like, there is provided at least one of a paper detecting devices in which conductive attracting means connected to a predetermined potential is disposed close to the optical means, the optical means is attached to a periodical replacing component of the image forming apparatus, a reflecting means 20b and a paper transporting path are oriented in different directions with respect to a photo sensing means 20d and a distance from the light emitting means 20c and the like to the reflecting means 20b is different from a distance from the light emitting means 20c and the like to the paper transporting path.

Optical detecting device for an image forming apparatus and an image

A belt transporter roller for an image forming apparatus according to the present invention has a rotating shaft of an elastic roller; and an elastic fin wound around the rotating shaft and provided along an axial direction thereof, the fin including at least two spiral groups different in winding direction.

Roller for belt transporting apparatus and image forming apparatus

The method reduces vibrations generated in a contactor due to movement of the moving body by which the contactor contacts with a moving body. When a stroke of vibration of the contactor is halved at an intermediate point of an amplitude thereof, the vibrations are made different from each other in frequency between the reciprocation stroke in the forward side which corresponds to one of the halved stroke portions and the reciprocation stroke in the backward side which corresponds to the other halved stroke portion.

Vibration reducing method

An image formation apparatus for forming an image includes an endless belt member and an inner face cleaning member which is provided on an inner face of the endless belt member. The cleaning member captures deposits deposited on the inner face of the endless belt member and holds the captured deposits. The inner face cleaning member includes fibers densely arranged and projecting radially outward from the inner face cleaning member. The inner face cleaning member is fixed in a contact state so that a contact face does not move while the endless belt is moving.

Inner face cleaning member for an intermediate transfer device

In order to set a position of a movable member in which a strip-like movable member which is disposed to be movable along a width direction perpendicular to a longitudinal direction of the member is disposed so that one edge of the movable member along the longitudinal direction facing a defined line; and the strip-like movable member is positioned with respect to a fixing member under a condition where the one edge is parallel to the defined line to maintain a uniform protruding amount from the defined line is maintained, the one edge of the movable member is made coincident with the defined line; the movable member is temporily fixed to the fixing member by interposing a position setting jig according to the protruding amount between the movable member and the fixing member; and after cancelling the temporarily fixing step to remove the position setting jig, directly fixing the movable member to the stationary member. Alternatively, a position setting jig according to the protruding amount is made coincident with the define line; and after abutting the one edge of the movable member against the position setting jig, the movable member is fixed to the fixing member. Further, position setting jigs for a movable member suitable for the above methods is provided.

Method of setting a position of a movable member, and a position setting

To bring a sheet 6 electrostatically into intimate contact with a conveyor belt 1 for transporting the sheet 6 by attraction means 60, a press roll 50A for pressing the sheet 6 against the conveyor belt 1 is disposed upstream from the attraction means 60. The press roll 50A is formed at the center with a large diameter part 51 for pressing the center of the sheet 6 stronger than both ends thereof. When transfer to the rear side of the sheet is executed at double-sided image formation, if both ends of the sheet 6 come in contact with the conveyor belt 1, the center of the sheet 6 is pressed strong, whereby deformation at the center is suppressed and a swell is smoothed out in the both-end direction. Relief parts at the rear end of the sheet are also prevented. Resultantly, the intimate contact property of the sheet 6 with the conveyor belt 1 is improved.

Image formation system with swell correction

Image forming apparatus with transfer belt pressing member

An image forming apparatus including a plural number of paper transporting units including at least first and second paper transporting units, in-unit paper sensing mechanism located in the first paper transporting unit, unit-to-unit paper sensing mechanism located between the first and second paper transporting units, and drive control mechanism for controlling the operations of the plural number of the paper transporting units, wherein the drive control mechanism includes first mechanism operating such that when any of the in-unit paper sensing mechanism located in the first paper transporting unit detects a paper transport trouble, the first mechanism stops the paper transporting operation of the second paper transporting unit in response to a sensing signal indicative of the presence of a paper from the unit-to-unit paper sensing mechanism, and second mechanism stops the paper transporting operation of the first paper transporting unit upon the stop of the paper transporting operation of the second paper transporting unit, and drives the first paper transporting unit to move the paper a predetermined distance in the direction that is reverse to the normal direction.

Paper transport control system for an image forming apparatus

An image forming apparatus comprising: an image recording unit including image carriers on which toner images are respectively formed, a paper carrier which conveys paper fed to a paper drawing-in position while drawing therein, and transfer units which transfer respective toner images on the image carriers onto the paper on the paper carrier at predetermined image transfer positions of the image carriers; paper jam detecting means for detecting a paper jam occurring when the paper drawn in by the paper carrier adheres to the surfaces of the image carriers; conveyor rollers disposed in a paper feeding unit which feeds the paper to a paper drawing-in position in the image recording unit at a predetermined timing; an inlet chute including an upper paper guide and a lower paper guide for guiding the paper fed from the conveyor rollers toward the paper drawing-in position; conveyor roller rotation control means which suspend the rotation of the conveyor rollers until the paper stretched between the image recording unit and the conveyor rollers of the paper feeding unit has passed through the conveyor rollers, if a paper jam arises while the paper is stretched between them; reverse rotation suspending means which rotates the paper carrier in a reverse direction if a paper jam arises and then suspends the rotation; and a removable member configured so as to be detachable from, and attachable to, a main unit of the image forming apparatus.

Growing community of inventors

Ebina, Japan

Mikio Kobayashi