Sharp Kabushiki Kaisha Corporation

Kan Mukai

Takashi Yamanaka

Tatsuya Shinkawa

Kimihide Tsukamoto

Yasuhiro Takai

Kouji Wakamoto

Toshiki Takiguchi

Kyosuke Taka

Nobuo Manabe

Tatsuya Inoue

Yoshiharu Yoneda

Tomomi Tanaka

Motoaki Okitsu

Shinji Sugita

Kousuke Namisaki

Kenichi Isomi

Keiji Masuda

Tosikazu Kitaura

The cleaning member is disposed to be opposite to the first roller with the second roller being provided therebetween. Compared to a case when the second roller is placed at a first position on a side of the first roller, if the second roller is placed at a second position on a side of the cleaning roller, a pressure between the second roller and the first roller becomes smaller, and a pressure between the second roller and the cleaning member becomes larger.

Roller device, fixing device, and image forming apparatus

A fixing device includes a cleaning member configured to clean a fixing member and a re-adhering member to which toner that adheres to the cleaning member is caused to re-adhere. The re-adhering member is disposed so as to face the fixing member. A surface of the cleaning member, which makes contact with the fixing member, may be constituted by a nonmetal member, and a surface of the re-adhering member, which makes contact with the cleaning member, may be constituted by a metal member.

Fixing device and image forming apparatus

A fixing device includes a fixing roller, a single heating member that heats the fixing roller, a pressure roller, a first temperature detecting element that detects the temperature of the contact region, of the fixing roller, that comes into contact with the recording paper transported, and a second temperature detecting element that detects the temperature of the noncontact region of the fixing roller. The fixing device carries out energization control of the heating member based on the temperature detected by the first temperature detecting element and stops energization control of the heating member when the temperature detected by the second temperature detecting element reaches a prescribed temperature.

Fixing device and image forming apparatus provided with fixing device

A paper separation claw is separated from a surface of a pressure roller by a drive source being turned ON at a time tbefore commencement of rotation of the pressure roller, and the paper separation claw is made to contact the surface of the pressure roller by the drive source being turned OFF after commencement of rotation (a time t) of the pressure roller. Furthermore, the paper separation claw is separated from the surface of the pressure roller by the drive source being turned ON again before stopping of rotation (a time t) of the pressure roller after an image forming operation of a single job is finished, and the paper separation claw is made to contact the surface of the pressure roller by the drive source being turned OFF again after stopping of rotation (a time t) of the pressure roller.

Fixing apparatus and image forming apparatus

A cleaning member for cleaning the toner remaining on the outer peripheral surface of a heat roller that fixes an unfixed developer image formed on a sheet of paper onto the paper by heating under pressure, includes: a mesh portion having a predetermined mesh in the area abutting the heat roller. The mesh portion is formed of heat resistant wires.

Cleaning member and image forming apparatus using the same

A fuser unit for an image forming apparatus including: a tape-like cleaning member that abuts on a fuser roller and cleans its peripheral surface; a press roller that presses the fuser roller via the cleaning member; a feed roller that feeds said cleaning member; a wind roller that winds the cleaning member therearound; and a controller that actuates a fixing function before an image formation, stops it after said image formation, and rotates and stops the wind roller and/or the feed roller to control a winding quantity of the cleaning member, wherein said controller calculates a toner image amount based on the prescribed number of pages by tracking from a page on which an image is formed just before the image formation is completed, and determines whether or not said cleaning member is wound around the wind roller during a non-fixing period based on the calculated toner image amount.

Fuser unit and image forming apparatus equipped with the same

One embodiment of the present invention involves a roller drive control method for a fixing apparatus in which a separation claw for separating a recording paper and a cleaning unit for removing toner that has become residual on a surface of a heat roller are arranged near a surface of the heat roller that fixes toner onto the recording paper, wherein a predetermined period different from a fixing process period in which fixing of toner onto the recording paper is carried out is set as a toner removal period for removing toner that has adhered to the separation claw, and the heat roller is rotationally driven so that the rotation velocity of the heat roller is different in the fixing process period and the toner removal period.

Roller drive control method for fixing apparatus

A fixing device mounted in an electrophotographic image forming apparatus, for fixing a toner image formed on recording paper includes: a plurality of peeling claws provided for peeling off the recording paper from a fixing roller; a number-of-processed-sheet detecting portion for detecting a number of processed sheets of recording paper which is treated with a fixing process upon passing through the fixing roller; a peeling claw driving section for moving a plurality of the peeling claws in parallel with an axial direction of the fixing roller; and a control unit for controlling the peeling claw driving section to operate so that a relative position between the peeling claw and the fixing roller changes according to a detected output of the number-of-processed-sheet detecting portion.

Fixing device and image forming apparatus having the same

A fixing unit includes a heat roller and a pressing roller that comes in pressure contact with the heat roller, and passes the recording paper with an unfixed toner image formed thereon through the nip between the heat roller and pressing roller to thereby fix the toner image to the recording paper by applying heat and pressure thereto. A cleaning device for removing the toner remaining on the heat roller or pressing roller in the fixing unit includes cleaning rollers made of metal arranged in press-contact with the heat roller and pressing roller, the peripheral surface of the cleaning rollers being formed with projected and indented shapes to thereby remove the leftover toner appropriately.

Cleaning device for a fixing unit

A fixing apparatus that firmly adheres unfixed toner onto a recording sheet includes a first cleaning unit for cleaning up toner adhering to a surface of a heating roller by using a belt-shaped cleaning member, and a second cleaning unit for cleaning up toner adhering to a surface of a pressurizing roller by using a roller-shaped member, wherein oil for promoting releasability is not supplied from the first cleaning unit whose cleaning member is an oilless member to the heating roller, and the oil is supplied only from the roller-shaped member of the second cleaning unit to the pressurizing roller.

Fixing apparatus and image forming apparatus equipped with the same

The present invention provides a fixing device for fixing a toner image formed on paper by sandwiching the paper in a nip region between a heating roller and a pressing roller and pressing the paper while heating the paper to a fixing temperature. This fixing device includes a cleaning roller that is in contact with the pressing roller, and temperature control means that sets a temperature of the heating roller to a cleaning temperature that is higher than the fixing temperature.

Fixing device

A digital image forming apparatus equipped with an optical scanner unit which is detachable from a main body includes an upper image reading section and a lower part image forming section. The apparatus is arranged such that the optical scanner unit can be installed and removed in and from the apparatus in a vertical direction, and can be removed through an opening provided for removing the image forming section therethrough. According to the described arrangement, during the installation and removal of the optical scanner unit, removal of the image reading section and a special opening for the optical scanner unit are not required, thereby reducing the restriction on structural design of the apparatus and permitting easy installation and removal of the optical scanner unit. As a result, the maintenance of the apparatus can be performed with an improved efficiency.

Digital image forming apparatus capable of easily installing and

The object of the present invention is to provide a paper pressing mechanism which performs feeding of curling sheets with a simple and compact structure. In order to realize the object, the paper pressing mechanism comprises a driving shaft 19; a paper pressing roller 15; a paper pressing arm 11 provided at both ends thereof with paper pressing portions 12, 13; and a supporting arm 17, axially supported in a rotatable manner at its one end by the driving shaft 19, and holding at the other free end the paper pressing roller 15 and the supporting arm 17 in a rotatable manner; and is characterized in that the supporting arm 17 is driven by the driving shaft 19 between a retracted position in which the mechanism is kept away from sheets of paper on a sheet table and a pressing position in which the sheets are pressed by both the paper pressing roller 15 and paper pressing portions 12,13 at the ends of the paper pressing arm 11.

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Nara, Japan

Kan Mukai