Konica Corporation

Konica Minolta Business Technologies, Inc.

Konica Minolta, Inc.

Satoshi Hamaya

Masami Maruko

Naoto Tokutake

Susumu Tashiro

Yotaro Sato

Takenobu Kimura

Tadashi Miwa

Tetsu Sekine

Toru Makino

Mikihiro Yamakawa

Hideo Isohara

Kazunori Katada

Yujiro Ishida

Tetsuko Kurosu

Takehito Hiraga

A paper conveying apparatus and an image forming apparatus are described which can appropriately convey a sheet when the sheet is restarted after forming a loop. The paper conveying apparatus includes a conveying roller pair in the upstream side of a loop roller pair, a stepping motor for rotationally driving the conveying roller pair, and a processor for controlling rotation of the stepping motor by controlling pulse signals and excitation current supplied to the stepping motor. This processor halts rotation of the conveying roller pair by stopping output of the pulse signals when loop formation of the sheet is completed, and switches the excitation current to a lower current value which is lower than a reference current value at which excitation is turned on.

Paper conveying apparatus and image forming apparatus

An image-forming apparatus contains an image-forming portion, a first conveying portion that is arranged at an upstream side of the image-forming portion along a sheet conveying direction, a second conveying portion that is arranged at an upstream side of the first conveying portion along the sheet conveying direction and a control portion. The control portion controls the first conveying portion to move a pair of registration rollers along a direction that is orthogonal to the sheet conveying direction while the pair of registration rollers nips the sheet when conveying the sheet to the image-forming portion. The control portion controls the second conveying portion to move one of the pair of conveying rollers along the direction that is orthogonal to the sheet conveying direction while the pair of conveying rollers does not nip the sheet.

Image-forming apparatus

Provided is an image forming apparatus having a fixing device for fixing an image at a nip portion formed of two rotary members which rotate while facing each other, wherein occurrence of uneven print gloss is prevented. The image forming apparatus having a fixing device for fixing an image at a nip portion formed of two rotary members which rotate while facing each other, wherein one of the two rotary members is a belt which rotates while being stretched around of a plurality of rollers, a roller arranged at the exit of the nip portion out of the plurality of rollers has a crown shape, and a slack absorbing member for absorbing a slack of both ends of the belt caused by the crown-shaped roller is in contact with the belt.

Fixing device and image forming apparatus

An image forming apparatus provided with a bent sheet feeding guide member in the transportation path for transporting the recording material with the inclination along the width direction of the guide surface configured by the bent sheet feeding guide member being variable, or provided with a pair of transporting rollers that transports a recording material in the transportation path for transporting a recording material with the inclination of the pair of transporting rollers along the axial direction being variable with respect to the transportation surface.

Image forming apparatus

In the discharge section to correct the potential of toner image on the intermediate transfer body before the secondary image transfer and to obtain a good secondary transfer image, it is made that the opposite electrode is brought into contact with the back surface of the intermediate transfer body under the stable condition. Between the primary image transfer unit and the secondary image transfer unit along the intermediate transfer body, the scorotron discharger is arranged at the position where the intermediate transfer belt is supported plane-likely, and on the rear side of the intermediate transfer body opposing to the grid of the discharger, the opposite electrode composed of the electric conductive brush is arranged, the electric conductive brush is brought into contact with the intermediate transfer body, and electrically grounded, and at least one of the plurality of support members has a configuration for adding more tension in the vicinity of the center of the intermediate transfer belt than in the vicinity of the both ends.

Color image forming apparatus having pre-transfer discharger

An image forming apparatus having an image forming unit that forms an image on an image bearing member, and a mainframe that firmly supports and positions the image bearing member and the image forming unit. The main frame has two side walls which are opposed to each other and substantially support the image bearing member and the image forming unit, a bottom wall to which the two side walls are rigidly connected, and a stay which is rigidly connected to the two side walls and is spaced away from the bottom wall. The bottom wall and the stay have a box type structure with an inner hollow room.

Mainframe structure of image forming apparatus

A transmission mechanism for transmitting rotation of a driving source in a main body to an object mounted on the main body for receiving the rotation, the transmission mechanism comprising a plurality of couplings provided at different positions along an axial direction of a rotating axis; wherein each of the couplings comprises, a male coupling member having a plurality of protrusions provided at an identical internal on an outer circumferential surface of the rotating axis; and a female coupling member having a plurality of protrusions for engaging with the male coupling's protrusions.

Drive power transmission device, image forming apparatus and process cartridge

An image forming apparatus having a rotational body. The apparatus includes: the rotating body such as a photoreceptor drum; a driver for driving the rotating body; the first member, provided in a driving transmission path of the driving force, for transmitting the driving force from the driving source to the rotating body, and for elastically deforming itself so as to control a natural frequency value of a driving system including the rotating body and driving source; and the second member, provided in the driving transmission path of the driving force, for controlling damping characteristics of the driving system.

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Hachioji, Japan

Satoshi Hamaya