Canon Kabushiki Kaisha

Toshiaki Miyashiro

Akihiko Takeuchi

Takehiko Suzuki

Tatsuya Kobayashi

Takaaki Tsuruya

Naoki Enomoto

Toshihiko Ochiai

Tetsuya Kobayashi

Motoi Katoh

Motoi Kato

Takao Kume

Haruo Fujii

Akihiko Uchiyama

Yoshiro Saito

Nobuaki Kabeya

Hiroshi Sasame

Akira Ito

Atsuyoshi Abe

Takao Aoki

Shinkichi Takahashi

Kazuhiro Funatani

Hisayoshi Kojima

Yoichiro Maebashi

Shinichi Tsukida

Mitsugu Inomata

Eihiro Sakaki

Fumihiro Ueno

Kimitaka Ichinose

Masahiro Suzuki

Yujiro Ando

Kazuhisa Kemmochi

Yuki Nishizawa

Jun Agata

Eiji Uekawa

Koji Nihonyanagi

Tomonori Shida

Wataru Uchida

Jun Asami

Tomoyuki Araki

Yasutaka Yagi

Naoto Tsuchihashi

Masao Nakano

Tetsuichiro Fujimoto

Taro Ishifune

Mitsuhiro Ito

Ryo Iwasawa

Keigo Akiya

Toshifumi Moritani

Yasuo Ito

Toshiki Nagase

A CPUsets the value of the applied voltage to a first set value when the absolute value of the amount of charge on the toner remaining on the intermediate transfer beltis lower than a threshold value, and sets the value of the applied voltage to a second set value when the absolute value of the amount of charge on the toner remaining on the intermediate transfer beltis equal to or greater than the threshold value, and when the first set value is Vand the second set value is V, the relationship |V|&#x3c;|V| is established.

Image forming apparatus

A roller used for a fixing apparatus has: a core; a first elastic layer that is formed outside the core and includes a first tapered portion on an edge of the roller in an axis direction; and a second elastic layer that is formed outside the first elastic layer and includes a second tapered portion on the edge in the axis direction on the same side as the first elastic layer. The second elastic layer has a hardness that is higher than the hardness of the first elastic layer. A second start point, which is a start point of the second tapered portion, is set in a position closer to the center of the roller in the axis direction than a first start point, which is a start point of the first tapered portion.

Roller having core with an elastic layer including tapered portion and fixing apparatus with such roller

A sheet interval, serving as the distance between conveyed recording materials, is properly controlled based on a kind of a recording material and any one of a printing ratio, an adhesion amount of toner, and the presence or absence of graphic data, thus allowing printing at throughput suitable for, for example, the kind of the recording material and the printing ratio without changing an image forming condition such that image quality does not vary.

In an image forming apparatus using an optical sensor for detecting light reflection characteristics of a toner image fixed on a transfer material, occurrence of gloss unevenness in a printed image can be prevented. The image forming apparatus includes a first transfer material conveying path for normal printing, a second transfer material conveying path for image density control, a sensor contact member integral with the optical sensor and a transfer material supporting member contacting a transfer material rear surface in a position opposing the sensor contact member. At the time of normal printing, the sensor contact member and the transfer material supporting member are disposed in a spaced position against the transfer material, and at the time of image density control, the sensor contact member or the transfer material supporting member moves so that the sensor contact member and the transfer material supporting member contact the transfer material.

Image forming apparatus with transfer material regulating members

An image forming apparatus includes an image bearing member for carrying a toner image; an image forming unit for forming a toner image on the image bearing member; a transfer material carrying member, for carrying a transfer material, wherein the toner image is transferred onto a transfer material carried on the transfer material carrying member or onto the transfer material carrying member; a density detecting unit for detecting a density of the toner image transferred to the transfer material carrying member; wherein a transfer intensity is smaller when the toner image for density detection is transferred onto the transfer material carrying member than when the toner image is transferred onto the transfer material carried on the transfer material carrying member.

Image forming apparatus with a changeable transfer bias for transferring a toner patch image

The present invention relates to a transfer material conveying apparatus for conveying a transfer material to which an image is fixed, comprising, an image surface roller located on an imaging surface side of the transfer material and disposed on a downstream side in a conveyance direction of the transfer material of a heating member and a pressing member for fixing an image to the transfer material and a facing roller located in facing to the image surface roller and disposed on a downstream side in a conveyance direction of the transfer material of a heating member and a pressing member for fixing an image to the transfer material. The image surface roller has a length equal to or longer than an image area on the transfer material in a direction perpendicular to the transfer material conveyance direction, and wherein the facing roller is spaced from the image surface roller with a prescribed distance.

Transfer material conveying apparatus and image forming apparatus

An image heating apparatus for heating an image formed on a recording material includes a flexible movable member: a supporting member, having a sliding surface for sliding relative to the movable member, for supporting the movable member; a pressing member for forming a nip with the supporting member with the movable member therebetween; wherein the supporting member is provided adjacent the sliding surface with a projection which is projected toward the pressing member beyond the sliding surface, the projection being extended in a longitudinal direction of the supporting member, and wherein the supporting member is provided at a longitudinal end portion with a cut-away portion providing a projection height which is smaller than that of the projection or providing a portion substantially flush with the sliding surface.

Image heating apparatus with projection extending in longitudinal direction of supporting member

An image heating apparatus for heating an image formed on a recording material, including a rotation member; an excitation coil for generating a magnetic field to induce an eddy current in the rotation member; a temperature detecting element for detecting a temperature of the rotation member; and a controller for controlling an electrical supply to the excitation coil so that the temperature detected by the temperature detecting element is maintained at a set temperature, wherein while the set temperature is set a stand-by temperature, the controller controls the electrical supply to the excitation coil and the rotation member is maintained in a stoppage of rotation.

Image heating apparatus using induction heating method

An image forming apparatus includes an image bearing member, image forming device for forming a toner image on the image bearing member, the image forming device including a charging member for electrically charging the image bearing member, an intermediary transfer member, voltage applying device for applying a voltage to send intermediary transfer member to electrically transfer the toner image on the image bearing member formed by the image forming device onto the intermediary transfer member, wherein the toner image on the intermediary transfer member is transferred onto a transfer material, and a controller for controlling the voltage applied to send intermediary transfer member by the voltage applying device in accordance with the voltage applied to the charging member when the voltage applied to the charging member is controlled to change a surface potential of the image bearing member.

System for reducing toner scattering

An image forming apparatus has an image bearing member for bearing a different color toner image; a movable intermediate transfer member; voltage applicator for applying a voltage to the intermediary transfer member to effect electrostatic, sequential and superimposing transfer of the different color toner images from the image bearing member onto the intermediary transfer member at a transfer position A first toner image on the intermediary transfer member passes through the transfer position in the period which is after a first toner image is transferred from the image bearing member onto the intermediary transfer member by the voltage applicator and which is before a second toner image which is immediately subsequent to the first toner image is transferred from the image bearing member onto the intermediary transfer member; and a control for switching a voltage applied to the intermediary transfer member from a first voltage for transferring the first toner image from the image bearing member onto the intermediary transfer member to a second voltage having an absolute value larger than that of the first voltage, before a leading edge of the first toner image on the intermediary transfer member reaches the transfer position during the period.

Image forming apparatus with control of voltage application to intermediate transfer member

A developing device mounted on a main body of an electrophotographic image forming apparatus and adapted to develop an electrostatic latent image formed on an electrophotographic photosensitive member, includes: a developer container including a developing portion with a developer bearing member for containing a developer therein and feeding the developer to the electrophotographic photosensitive member and a hopper for containing the developer therein and feeding the developer to the developing portion in order to develop the electrostatic latent image formed on the electrophotographic photosensitive member; and a developer residual amount detecting electrode pair having first and second electrodes disposed to interpose the developing portion and the hopper portion therebetween in order to detect the residual amount of developer by the main body of the electrophotographic image forming apparatus; wherein the first electrode of the developer residual amount detecting electrode pair comprises the developer bearing member, and the second electrode is fitted on an outer wall of the developer container.

Developing device, process cartridge and electrophotographic image forming apparatus with capacitance detector for detecting residual toner amount

An image forming apparatus includes an intermediate transfer member, an image forming device for forming a toner image on the intermediate transfer member, a charging device for charging residual toner remaining on the intermediate transfer member after the toner image formed by the image forming device and located on the intermediate transfer member is electrostatically transferred onto a transfer material. The residual toner charged by the charging device and remaining on the intermediate transfer member is electrostatically transferred onto the image forming device. After the toner image is transferred from the intermediate transfer member to a first side of the transfer material, a toner image can be transferred from the intermediate transfer member to a second side of the transfer material opposite to the first side, and a control device for controlling voltage to be impressed to the charging device in dependence upon whether the toner image was transferred from the intermediate transfer member to the first side of the transfer material or the toner image was transferred from the intermediate transfer member to the second side of the transfer material.

Image forming apparatus having different operating values for first and second side image formation

A developing device mounted on a main body of an electrophotographic image forming apparatus and adapted to develop an electrostatic latent image formed on an electrophotographic photosensitive member includes a developer container having a developing portion with a developer bearing member for containing a developer and feeding the developer to the electrophotographic photosensitive member, and a hopper portion for containing the developer and supplying the developer to the developing portion, in order to develop the electrostatic latent image formed on the electrophotographic photosensitive member, and a developer residual amount detecting electrode pair having first and second electrodes disposed to interpose said developing portion and the hopper portion therebetween in order to detect the residual amount of developer by the main body of the electrophotographic image forming apparatus, wherein the developer residual amount detecting electrode pair are shaped such that a space region defined between the first and second electrodes includes substantially 20% or more of a space in the developing portion and the hopper portion which is filled with the developer.

Developing device, process cartridge and electrophotographic image forming apparatus

An image forming apparatus includes an image bearing member, an image forming device for sequentially forming toner images of different colors on the image bearing member, the image forming device including a charging member for electrically charging the image bearing member to a polarity which is the same as a regular charging polarity of the toner. The apparatus also includes an intermediary transfer member having a volume resistivity of 10,-10,&OHgr;&middot;cm, an image transferring device for applying a voltage to the intermediary transfer member to transfer electrostatically, sequentially, and superimposedly the toner images of the different colors formed on the image bearing member by the image forming means onto the intermediary transfer member, wherein toner images on the intermediary transfer member are transferred onto a transfer material, and a control device for controlling a voltage applied to the charging member, the control device controlling the voltage applied to the intermediary transfer member by the image transferring device in accordance with the voltage applied to the charging member.

A color image forming apparatus has developing unit, an image bearing member capable of bearing thereon toner images of plural colors formed by the developing unit, a rotatable intermediate transferring member, transferring unit for transferring the toner images of plural colors on the image bearing member to the intermediate transferring member at a first transferring position in electrostatically superposed relationship with one another, and a charger for charging any residual toner remaining on the intermediate transferring member after the toner images on the intermediate transferring member transferred by the transferring unit have been transferred to a transfer material at a second transferring position to a polarity opposite to the regular charging polarity of the toners in the developing unit. Simultaneously with the next toner image on the image bearing member being transferred to the intermediate transferring member at the first transferring position by the transferring unit, the residual toner charged by the charger is transferred to the image bearing member at the first transferring position by the transferring unit, and the first toner image transferred from the image bearing member to the intermediate transferring member at the first transferring position by the transferring unit is a black toner image.

Color image forming apparatus which prevents the scatter of color characters and lines

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Shizuoka-ken, Japan

Toshiaki Miyashiro