Canon Kabushiki Kaisha

Inoac Corporation

Yoshiro Saito

Tetsuya Kobayashi

Naoki Enomoto

Hiroshi Sasame

Akihiko Uchiyama

Tatsuya Kobayashi

Haruo Fujii

Hiroyuki Seki

Kazuhiro Funatani

Toshiaki Miyashiro

Masahide Hirai

Tatsuya Kinukawa

Tatsuhiko Hayakawa

Tomoaki Nakai

Yoichiro Maebashi

Yasutaka Yagi

Takaaki Tsuruya

Michio Uchida

Arihiro Yamamoto

Motoi Katoh

Youichirou Maebashi

Masahide Kinoshita

Kazuhisa Kemmochi

Tomonori Shida

Takao Aoki

Tsuyoshi Nakagawa

Kimitaka Ichinose

Yoshiro Tsuchiya

Motoi Kato

Kazunori Takashima

Shunichi Ebihara

Toru Ishigaki

Masahiro Suzuki

Satoshi Saito

Satoshi Shimizu

Takehiko Suzuki

Takashi Kawana

Akira Ito

Kenta Kamikura

Takao Kume

Yasunari Watanabe

Mahito Yoshioka

Toshihiko Ochiai

Shun-ichi Ebihara

Hiroaki Kawakami

Yuzo Seino

Takashi Shibuya

Masaki Shimomura

Masao Nakano

Norihisa Hoshika

Kazunori Hashimoto

Noriyuki Yanai

Tohru Saito

Keisuke Mitsuhashi

Hitoshi Furukawa

Kentaro Yamashita

Toshifumi Moritani

Eiji Tanaka

Tetsuya Hase

Hideo Kimata

Tomoyuki Ohkura

An image forming apparatus includes an image bearing member, a transfer member, a voltage applying portion applying a voltage to the transfer member, and a controller. The controller starts a control operation by applying a control voltage to the transfer member before a toner image is transferred to a transferred member from the image bearing member. On the basis of a coverage ratio indicating a ratio occupied by an image region per predetermined area regarding the toner image transferred to the transferred member from the image bearing member, the controller determines execution or non-execution of the control operation capable of being started before the toner image is transferred to the transferred member.

Image forming apparatus capable of setting transfer voltage and suppressing deterioration of members due to control operation of transfer voltage

In an image forming apparatus, a fixing member has a surface layer having conductivity. A developer is a toner having a toner particle including a binder resin, a reactant of a polyhydric acid and a compound containing a group 4 element is present on a surface of the toner particle, and Tv/Fv&#x3e;100 is satisfied where Tv represents a volume resistivity upon being unfixed, and Fv represents a volume resistivity after fixing. A bias applying unit can selectively apply a bias of a positive polarity and a bias of a negative polarity, and applies a bias of the same polarity as the charged polarity of a filler included in a recording material when the recording material passes through a fixing nip portion, and when the recording material does not pass through the fixing nip portion, respectively.

Image forming apparatus

An image forming apparatus includes an image bearing member configured to bear a non-fixed toner image, a transfer portion configured to transfer the non-fixed toner image onto a sheet at a transfer nip, a fixing portion including a first rotary member, a second rotary member and a heating portion configured to heat the first rotary member, a control portion configured to execute a nip image forming process of forming a nip image, on the sheet, corresponding to a shape of the fixing nip, and a reading unit configured to read the nip image, wherein the control portion sets the heating portion to a first temperature in a case where the non-fixed toner image passes through the fixing nip and sets the heating portion to a second temperature which is lower than the first temperature in a case where the nip image passes through the fixing nip.

Image forming apparatus that can form a nip image corresponding to a fixing nip shape

There is provided an image forming apparatus in which an image forming speed is changed in a state where toner is provided between a photosensitive drum and an intermediate transfer member. Therefore, even if a speed difference between the photosensitive drum and the intermediate transfer member is generated, a drive torque can be suppressed, and deterioration caused by abrasion of the photosensitive drum and the intermediate transfer member can be reduced.

Image forming apparatus with changing photosensitive member speed

An image forming apparatus includes an image bearing member on which a toner image is to be formed; a transfer device for transferring the toner image carried on the image bearing member; and a rotationally movable endless transfer belt onto which the toner image is to be transferred or on which a transfer material onto which the toner image is to be transferred is to be conveyed. The transfer device includes a sheet member contacted to an inner peripheral surface of the transfer belt while being supported by a supporting member at an end thereof and includes an urging member for urging the sheet member against the transfer belt in contact to the sheet member. The urging member includes a projected portion projected toward the transfer belt at its downstream end portion more than at its upstream end portion with respect to a movement direction of the transfer belt.

Image forming apparatus with urging member with projected portion to urge sheet against transfer belt

There is provided an image forming apparatus which shortens the time taken for circumference detection and measures the circumference at high precision without obstructing downsizing of the apparatus. To accomplish this, the image forming apparatus detects, at an arbitrary timing, the physical pattern of the image-formed surface of a rotation member that changes over time. In the second round, the image forming apparatus detects the second pattern at a timing a predetermined time after the arbitrary timing. By using the detected patterns, the image forming apparatus obtains information associated with the circumference of the rotation member.

Image forming apparatus and control method thereof

There is provided an image forming apparatus including a rotation member used for image forming and a detector for detecting light from the rotation member. First waveform data of an image-formed surface used to form an image on the rotation member is acquired by the detector. Second waveform data of the image-formed surface used to form an image on the rotation member is acquired. The second waveform data includes at least part of a detected section of the first waveform data. Information on the actual circumference of the rotation member is calculated based on matching between the acquired first and second waveform data. The acquired first waveform data and second waveform data are compared to determine whether or not to use the calculated information on the circumference. When it is determined not to use the calculated information on the circumference, information on the circumference of the rotation member is recalculated.

Image forming apparatus including a rotation member circumference calculator and control method thereof

An image forming apparatus includes a transfer roller that can be separated from an intermediate transfer belt. When an operational mode is switched from a multicolor mode to a mono-color mode, the image forming apparatus changes a rotational speed of the intermediate transfer belt to a level slower than a rotational speed of the intermediate transfer belt to be set in the multicolor mode to transfer a toner image to the intermediate transfer belt, then separates a first transfer member from the intermediate transfer belt, and after the first transfer member is separated from the intermediate transfer belt, the image forming apparatus increases the rotational speed of the intermediate transfer belt to a rotational speed to be set in the mono-color mode to transfer the toner image to the intermediate transfer belt.

Image forming apparatus that includes a transfer member that can be separated from an inner circumferential surface of a transfer belt when belt is rotating

There is provided an image forming apparatus that accurately obtains the dynamic characteristic of the apparatus when a foreign substance is adhered to a driving roller for driving an endless belt, such as a facing roller. To accomplish this, the image forming apparatus uses an optical sensor to detect information of a foreign substance on the facing roller. When it is determined that there is no foreign substance information, the image forming apparatus executes profile detection of an intermediate transfer belt using the nominal circumference of the facing roller. When the optical sensor detects foreign substance information, the image forming apparatus measures the circumference of the facing roller, and performs profile detection of the intermediate transfer belt using the measured circumference of the facing roller.

Image forming apparatus and control method thereof featuring image member surface data detection

Image forming apparatus with dynamic characteristic calculation

Image forming apparatus taht includes a transfer member that can be separated from an inner circumferential surface of a transfer belt when belt is rotating

An image forming apparatus operates in a marginless print mode in which the toner image is formed on a first region on a first image bearing member corresponding to a sheet size and a second region on the first image bearing member outside the first region. Reverse-transfer efficiency TRand reverse-transfer efficiency TRsatisfy TR&#x3c;TR. TRis a percentage of a mass/area, of toner back-transferred from the sheet onto the second image bearing member by a second transfer member to a mass/area, of toner transferred from the first region onto the sheet by a first transfer member. TRis a percentage of a mass/area, of toner back-transferred from a sheet feeder onto the second image bearing member by a second transferring means to a mass/area, of the toner transferred from the second region onto the sheet feeder by the first transfer member.

Image forming apparatus with marginless printing mode

An image forming apparatus includes an image bearing member, and a transfer member, wherein an image on the image bearing member is transferred to a member to be transferred by applying a voltage to the transfer member, and wherein the transfer member has an ion conductor part having an antioxidant. Variation in resistivity accompanying a change in applied voltage is thereby reduced, whereby sufficiently high transferring efficiency can be maintained during a durability test.

Transferring roller, transfer device, and image forming apparatus

There is provided an image forming apparatus that can suppress the formation of creases when forming images on both surfaces of a sheet and can greatly reduce the incidence of unprinted areas. The image forming apparatus has a sheet stacking section in which sheets are stacked, a sheet conveying section that conveys a sheet, an image forming section that forms an image on the sheet while the sheet is conveyed, a re-conveying section that again conveys the sheet with the image formed on a first surface thereof to the image forming section, and a sheet feeding section that feeds a sheet from the sheet stacking section or the re-conveying section to the image forming section. When a sheet is fed from the sheet stacking section for image formation on the first surface of the sheet by the image forming section, the sheet is fed at a first speed, and when a sheet is fed from the re-conveying section for image formation on a second surface of the sheet by the image forming section, the sheet is fed at a second speed that is slower than the first speed and is slower than the speed at which the sheet is conveyed by the sheet conveying section.

Image forming apparatus and image forming method

Growing community of inventors

Yokohama, Japan

Yoshiro Saito