Canon Kabushiki Kaisha

Kazuhiro Funatani

Shinsuke Kobayashi

Ai Suzuki

Kensuke Umeda

Takanori Watanabe

Hiroyuki Seki

Shuichi Tetsuno

Toshihiko Takayama

Jun Hara

Hiroshi Kita

Yoshiro Saito

Yasutaka Yagi

Tetsuichiro Fujimoto

Masahide Hirai

Tatsuya Kinukawa

Akihiko Takeuchi

Masatake Tanaka

Tomoaki Nakai

Shuji Saito

Kimitaka Ichinose

Kenichi Iida

Takaaki Tsuruya

Hideyuki Yano

Kentaro Yamawaki

Masaki Shimomura

Yoshiki Kudo

Masanori Asai

Keita Sato

Tatsuya Kobayashi

Toshiaki Miyashiro

Akihiko Uchiyama

Naoki Enomoto

Takamitsu Soda

Masamichi Sato

Kenji Watanabe

Ken Nakagawa

Takao Kume

Akimichi Suzuki

Hiroaki Sakai

Tomonori Shida

Takayuki Miyamoto

Hitoshi Furukawa

Masatake Usui

Mikihiko Hamada

A heating device has a first rotating member that is heated by a heat source, and a second rotating member that forms a nip portion with the first rotating member, such that a recording material is heated up at the nip portion. The heating device further has: a first cover disposed along an outer peripheral surface of the first rotating member, so as to surround the first rotating member, and a second cover, disposed between the first cover and the first rotating member, and having a protruding portion that protrudes towards the first rotating member. In a longitudinal direction of the first rotating member, a length of the first rotating member is a first length, and a length of the protruding portion is a second length that is smaller than the first length.

Heating device and image forming apparatus

A mechanism that enables developer replenishment by a simpler structure and a mechanism that enables more user-friendly developer replenishment are provided. An attachment port to which a developer supply bottle containing a developer stored therein is detachably attachable is disposed in an interior of an image forming apparatus. The developer supply bottle can be attached when the cover is in an open state. According to this image forming apparatus, when the developer supply bottle is attached to the attachment port, the developer inside the developer supply bottle moves into a developer housing chamber by its own weight.

Image forming apparatus with simplified developer replenishment structure and that is user-friendly

An image forming apparatus to and from which a replenishment container accommodating toner is attachable and detachable includes a replenishment port to allow replenishment of toner from the replenishment container, an opening/closing portion to open the replenishment port in an open position and close the replenishment port in a closed position, a locking member to move between a restricting position in which the locking member restricts movement of the opening/closing portion from the closed position to the open position, and an allowing position in which the movement of the opening/closing portion from the closed position to the open position is allowed. A developer container accepts more toner for replenishment in a case where a second display is in a second state than in a first state, and a first display more accurately displays information related to the toner accommodated in the developer container than the second display.

Image forming apparatus having a toner replenishment operation

An image forming apparatus controls the number of rotations of a photosensitive drum based on information related to the use of the photosensitive drum and a suspension time in a rotation operation of rotating the photosensitive drum after a lapse of the suspension time between a first image forming operation of forming an image on a transfer material and a second image forming operation performed after the first image forming operation.

Image forming apparatus

An image forming apparatus includes a rotatable photosensitive member, a charging member, a developing device, a transfer member, a brush, a driving source and a control portion. The control portion controls the driving source to execute an image forming process, in which image formation on the recording material is executed, and a non-image-forming process, in which the photosensitive member is driven to rotate other than in the image forming process. The non-image-forming process between a first recording material and a second recording material, to which the image formation is executed following the first recording material, is defined as a first non-image-forming process, and the non-image-forming process between the second recording material and a third recording material is defined as a second non-image-forming process. The control portion determines a time of the second non-image-forming process based on history information correlating with a usage amount of the photosensitive member and a time of the first non-image-forming process.

Image forming apparatus controlling image forming and sheet interval operations

An image forming apparatus has a normal image formation mode and a wide color gamut image formation mode in which an amount of a developer per unit area of a developer image of at least a color that differs from a prescribed color among a plurality of colors is increased as compared to the normal image formation mode. Image data is generated such that an image portion formed in the prescribed color in an image formed on a recording material is formed solely by a developer image of the prescribed color in the normal image formation mode, but formed by superimposing a developer image of a color that differs from the prescribed color on a developer image of the prescribed color or formed solely by a developer image of a different color in place of a developer image of the prescribed color in the wide color gamut image formation mode.

Provided are an image bearing member; a charging member that charges the image bearing member; an exposure unit that exposes the image bearing member; a developing unit that develops an electrostatic latent image as a developer image by supplying a developer, charged to regular polarity, to the image bearing member; a transfer member that transfers the developer image to a transfer-receiving body; and a collecting member that collects a deposit on the image bearing member downstream of a transfer portion of the image bearing member at which the developer image is transferred to the transfer-receiving body by the transfer member, and upstream of a charging portion of the image bearing member charged by the charging member, in a rotation direction of the image bearing member. After transfer of the developer image to the transfer-receiving body, the developer remaining on the image bearing member is collected by the developing unit.

An image forming apparatus includes a charging unit that charges an image bearing member, a developing unit that forms a toner image on an latent image formed on the image bearing member, a transfer unit that transfers the toner image onto a transfer material, a charge neutralizer that neutralizes a charge of the image bearing member downstream of a transfer portion and upstream of a charging portion in a rotating direction of the image bearing member, a conductive collecting unit that collects a material adhering on the image bearing member downstream of the transfer portion and upstream of the charging portion, wherein the developing unit collects residual toner on the image bearing member, an voltage application unit sets a potential difference between the voltage applied to the collecting unit and the surface electric potential of the image bearing member not more than a discharge threshold.

Image forming apparatus with brush that collects material adhered to surface of image bearing member and that includes brush portion including threads having specified thread density

A cartridge attachable to and detachable from an image forming apparatus forming an image on a recording material, the cartridge includes: an image bearing member; a developer container that contains therein a developer; a developing member that is rotatable and carries the developer supplied from the developer container and supplies the developer to the image bearing member; a developer supplying member that is rotatable and provided in the developer container and in contact with the developing member to supply the developer to a surface of the developing member; and a contact member provided in the developer container and in contact with a surface of the developer supplying member, wherein the developer remaining on the image bearing member after image formation is collected to the developing member, and the developer collected to the developing member is collected into the developer container.

Image forming apparatus including brush for surface of developer supplying member

An image forming apparatus includes a photosensitive member, a charging member, an electrostatic image forming portion, a developing member, a transfer member, a transfer voltage source, a brush member, a brush voltage source, and a controller capable of executing a cleaning operation. The controller carries out control so that the cleaning operation includes a first operation in which a potential difference is formed between the transfer member and the photosensitive member so that toner charged to a normal charge polarity is moved from the transfer member toward the photosensitive member, and a second operation in which a potential difference is formed between the brush member and the photosensitive member so that the toner charged to the normal charge polarity is moved from the photosensitive member toward the brush member.

Image forming apparatus capable of suppressing an improper charge resulting from toner being moved from a transfer member to a photosensitive member

A control unit performs control to make a direction of an electric field generated in a first area of an image carrier forming a transfer portion during image forming operation, relative to a voltage applied to a brush member in a state where the first area passes through a contact portion, different from a direction of an electric field generated in a second area of the image carrier forming the contact portion, relative to the voltage applied to the brush member during a period when operation is shifted from first operation in which the image carrier is rotated at a first speed to second operation in which the image carrier is rotated at a second speed different from the first speed, during non-image forming operation different from the image forming operation.

An image forming apparatus including an image bearing member, a charging member, a developing roller, a transfer roller, and a brush configured to be brought into contact with a surface of the image bearing member on a side downstream of a transfer portion and upstream of a charging portion in a rotation direction of the image bearing member and in which, wherein, after the transfer of a developer image onto a transferred member, a developer remaining on the surface of the image bearing member is collected by the developing roller, the brush is disposed such that, in a cross section perpendicular to a rotation axis of the image bearing member, a contact region of the surface of the image bearing member in contact with the brush overlaps a virtual line containing the rotation axis of the image bearing member and extending upward from the rotation axis in a vertical direction.

An image forming apparatus includes a rotatable photosensitive member, a charging member, a developing device, a transfer member, a brush, a driving source and a control portion. The control portion controls the driving source to execute an image forming process in which image formation on the recording material is executed and a non-image-forming process in which the photosensitive member is driven to rotate other than in the image forming process. The non-image-forming process between a first recording material and a second recording material, to which the image formation is executed following the first recording material, is defined as a first non-image-forming process, and the non-image-forming process between the second recording material and a third recording material is defined as a second non-image-forming process. The control portion determines a time of the second non-image-forming process based on history information correlating with a usage amount of the photosensitive member and a time of the first non-image-forming process.

Image forming apparatus controlling condition of charging brush

Growing community of inventors

Mishima, Japan

Kazuhiro Funatani