Canon Kabushiki Kaisha

Tetsuichiro Fujimoto

Kazuhiro Funatani

Yasutaka Yagi

Hiroyuki Seki

Keisuke Mochizuki

Shuji Saito

Masanori Asai

Munehito Kurata

Kimitaka Ichinose

Noriaki Sato

Toshiaki Miyashiro

Mahito Yoshioka

Shun-ichi Ebihara

Tsuyoshi Ogawa

Hiromitsu Kumada

Kohei Haematsu

A fixing apparatus includes a rotatable fixing member, a rotatable pressurizing member, a heating portion, and a circuit portion including a contact member and configured to remove electric charge from the fixing member, the contact member being in contact with the fixing member. A surface layer of the pressurizing member is electrically connected to the circuit portion via a surface layer of the fixing member. In a case where a surface resistivity of the surface layer of the pressurizing member is represented by X (Ω/□) and a surface resistivity of the surface layer of the fixing member is represented by Y (Ω/□), 4.0≤log X≤13.0, 5.0≤log Y≤14.0, log Y≥13.0−log X, and log Y≤23.0−log X are satisfied.

Fixing apparatus and image forming apparatus

An image forming apparatus includes a control unit configured to execute a first mode and a second mode. The first mode is a mode in which a toner image is formed on a sheet at a time when a sheet passes through an image formation position for a first time after detecting a property of the sheet by a detection unit. Wherein the second mode is a mode in which a toner image is not formed on a sheet at the time when the sheet passes through the image formation position for the first time after detecting the property of the sheet by the detection unit and is formed on the sheet at a time when the sheet is conveyed via the second conveyance path and passes through the image formation position for a second time.

Image forming apparatus

An image forming system includes a first image forming apparatus and a second image forming apparatus connected with the first image forming apparatus by a network line. When a second stacking portion of the second image forming apparatus is associated with a first stacking portion of the first image forming apparatus by a setting portion, an arithmetic portion acquires information related to the characteristic of a second recording medium stacked by the second stacking portion via the network line and obtains a degree of deterioration of a feeding rotatable member of the first image forming apparatus based on the acquired information related to the characteristic of the second recording medium.

Image forming apparatus and image forming system

A cylindrical film for use with an image heating apparatus includes a plurality of heat generating elements configured to generate heat by a flow of a current, in which each of the heat generating elements has a ring shape and is arranged along a longitudinal direction of the film; a ring-shaped insulating portion configured to electrically insulate the heat generating elements adjacent to each other; and a heat conductive layer different from a layer of the heat generating elements with respect to a thickness direction of the film, The heat conductive layer is 3 W/mK or more in thermal conductivity and overlaps with the heat generating elements with respect to the longitudinal direction.

Cylindrical film and image heating apparatus

An image forming apparatus includes an image forming unit, a transfer portion that transfers a toner image to a transfer material, a first roller disposed upstream of the transfer portion in a conveying direction of the transfer material, and a second roller disposed upstream of the transfer portion and downstream of the first roller. The triboelectric charge polarities of the surfaces of the first and second rollers when the surfaces are triboelectrically charged by contact with the transfer material differ from each other.

Image forming apparatus for forming and transferring a toner image

An image forming apparatus includes a controller for forming an adjustment toner image in a region corresponding to between a first region corresponding to a preceding sheet and a second region corresponding to a subsequent sheet, wherein the controller selectively executes a first mode for setting as a first length a gap between the adjustment image and a trailing edge of the first region and for setting as a second length a gap between the adjustment toner image and a leading end of the second region, or a second mode for setting as a third length a gap between the adjustment toner image and the trailing edge of the first region and for setting as a fourth length a gap between the adjustment image and the leading end of the second region. The third is shorter than the first, and the fourth length is longer than the first length.

Image forming apparatus utilizing adjustment toner image

An image forming apparatus including a cleaning member having a belt cleaning blade and a conductive brush. A value of a charging current that is generated when charging residual toner with the conductive brush is smaller when a color mode is executed compared to that when a monochrome mode is executed.

In an adjustment step, an adjustment purpose toner image is formed on an intermediate transfer belt, and the adjustment purpose toner image is removed from the intermediate transfer belt by a cleaning member contacting the intermediate transfer belt and through an electrostatic cleaning step. This adjustment step is executed in a state where a toner attachment amount on a charging member is switched from a first limit value, which is allowed in the image forming step to a second limit value, which is allowed immediately before executing the adjustment step. This switching is performed by the execution of a toner discharging step, where a power supply changes the state of applying voltage to the charging member from that in the electrostatic cleaning step, so that toner attached to the charging member is transferred to the intermediate transfer belt.

Image forming apparatus with cleaning using cleaning member and charging member

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.

An image forming apparatus includes an image bearing member; an intermediary transfer member; a controller; and a cleaning unit. The cleaning unit includes a cleaning member for collecting a residual toner in contact with the intermediary transfer member, a charging member, which is provided downstream of the cleaning member with respect to a movement direction of the intermediary transfer member, for electrically charging the residual toner, and an accommodating member for accommodating the residual toner. The controller is capable of executing an operation in a discharging mode in which the toner is discharged from the charging member onto the intermediary transfer member. When the operation in the discharging mode is executed, the cleaning unit collects the toner, discharged from the charging member on the intermediary transfer member, by the cleaning member and then accommodates the collected toner in the accommodating member.

An image forming apparatus includes a control unit, which is configured to, if a developing material image transferred to another member is formed on an image carrier, obtain a print ratio that is a ratio of the area of the formed developing material image with respect to the area of a developing material image capable of being formed on a recording material that is to be printed on, and a threshold value corresponding to a consumption amount of the developing material in a image forming unit and a number of sheets printed, and control an amount of developing material that is to be supplied to a cleaning unit in accordance with the print ratio and the threshold value.

Image forming apparatus including cleaning unit for removing developing material

An image forming apparatus has a control unit configured to: after an image is formed in a color mode, if an integrated supply amount is larger than or equal to a reference supply amount, cause a supply image with a first amount of developer, otherwise, cause a supply image with a second amount of developer larger that the first amount; and, after an image is formed in the monochrome mode, cause a supply image with a third amount of developer smaller than the first amount, and, to make an interval between recording materials when the supply image with the third amount is formed shorter than an interval between recording materials when the supply image with the first amount or larger is formed.

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Mishima, Japan

Tetsuichiro Fujimoto