Canon Kabushiki Kaisha

Kenji Takagi

Hideo Nanataki

Keita Nakajima

Akimichi Suzuki

Takashi Nomura

Takashi Yano

Kenji Watanabe

Shinsuke Kobayashi

Yusuke Shimizu

Takaaki Tsuruya

Tsutomu Shimano

Tomoaki Nakai

Kohei Matsuda

Yuki Nishizawa

Daizo Fukuzawa

Tetsuya Sano

Noritomo Yamaguchi

Taisuke Minagawa

Terutaka Endo

Toshiya Kaino

Hiroyuki Kadowaki

Masaki Shimomura

Shigeto Tamura

Keisuke Mitsuhashi

Kazuhiko Aono

Yusuke Jinkoma

Masamitsu Watahiki

In a case where a region of a heating pressurization unit in a longitudinal direction of the heating pressurization unit where the heating pressurization unit heats and pressurizes a sheet of a maximum size is a first region, and a region of the heating pressurization unit in the longitudinal direction where the heating pressurization unit heats and pressurizes a sheet of a minimum size is a second region, and a region of the heating pressurization unit inside the first region and outside the second region in the longitudinal direction is a third region, the heating pressurization unit heats and pressurizes the sheet of the maximum size with a pressurization force profile having a minimum value in the longitudinal direction at a position in the third region or a position of an end portion of the second region adjacent to the third region.

Booklet production apparatus and image forming system

A booklet forming device includes a sheet support portion, and a bonding unit including a pressurizing member and configured to form a bonding layer. In a case of forming a first booklet including a first number of sheets, the bonding unit is operated under a first operation condition so that a thickness of the bonding layer positioned closest to the pressurizing member in the first booklet becomes a first thickness. In a case of forming a second booklet including a second number of sheets more than the first number of sheets, the bonding unit is operated under a second operation condition different from the first operation condition so that the thickness of the bonding layer positioned closest to the pressurizing member in the second booklet becomes a second thickness larger than the first thickness.

Booklet forming device and image forming apparatus

An image forming apparatus includes an image forming portion, a fixing portion configured to heat the toner image formed on the sheet by the image forming portion and fix the toner image to the sheet, a folding portion configured to fold the sheet having passed through the fixing portion such that a surface of the sheet to which the powder adhesive is applied is inside, and a bonding portion configured to heat the sheet folded by the folding portion and bond the sheet by the powder adhesive. A relationship of Tmax1>Tmax2 is satisfied, where Tmax1 (° C.) is a highest temperature of the powder adhesive when being heated by the fixing portion and Tmax2 (° C.) is a highest temperature of the powder adhesive when being heated by the bonding portion.

Image forming apparatus

An image forming apparatus includes: an image bearing member that carries a developer image; a transfer member that forms a transfer nip portion with the image bearing member and transfers the developer image in the transfer nip portion from the image bearing member to a recording material; a fixing portion that includes a heater and fixes the developer image to the recording material using heat of the heater; a temperature detection portion that detects a temperature of the fixing portion; a control portion that controls power supplied to the heater such that the temperature detected by the temperature detection portion becomes a predetermined control target temperature; and an acquisition portion that acquires a temperature of the image bearing member or the transfer member. The control target temperature is changed based on the temperature acquired by the acquisition portion.

An image forming apparatus includes an image forming unit configured to form a toner image on one surface of a recording material, a fixing unit configured to fix the toner image on the surface of the recording material in a nip portion formed by a heating unit and a pressing unit, a discharge unit configured to discharge the recording material on which the toner image has been fixed to a discharge tray, and a recording material conveyance path between the fixing unit and the discharge unit. In a conveyance direction of the recording material from the fixing unit to the discharge unit, a fan is disposed between the fixing unit and the discharge unit. The fan takes in air from an intake portion that takes in air of the recording material conveyance path and exhausts air such that air is applied to the recording material discharged from the discharge unit.

A heater being used in an image heating apparatus includes a glass layer formed on one surface of a substrate of the heater, the heater has a base layer formed so as to extend in a longitudinal direction of the substrate between another surface of the substrate and the glass layer and at a position closer to an end side of the substrate than a center position of a heating element provided on the other surface of the substrate in a transverse direction that is orthogonal to the longitudinal direction of the substrate, the base layer having a glass content of 10 wt % or lower, and a peak portion with a peak height from the other surface in the glass layer is positioned within 1.0 mm from an end in the transverse direction of the substrate.

Heater having a glass layer provided on an opposite surface of a substrate from a surface on which a heating element is provided, image heating apparatus mounted with the same, and image forming apparatus

An image forming apparatus, including: a determining portion to acquire a density value for respective colors of toners, obtain a sum value of the density values of the colors of the toners, obtain a numerical value indicating the number of the density values being values larger than 0 out of the density values corresponding to the colors of the toners, and determine a target temperature on the basis of the sum value and the numerical value, wherein in a case the sum value is a first value and the numerical value is a first number, the determining portion determines a first temperature as the target temperature, in a case the sum value is the first value and the numerical value is a second number that is larger than the first number, the determining portion determines a second temperature that is lower than the first temperature as the target temperature.

Image forming apparatus and image forming method

An image heating apparatus includes a heater having a plurality of resistors, and a power supply control circuit that controls power supplied to the plurality of resistors so as to selectively heat a plurality of heating regions. A plurality of thermistors detect a temperature of each of a plurality of regions of the image heater, and a processor functions as a current amount correcting portion that corrects an amount of current supplied to the plurality of resistors. The current amount is corrected based on the temperature detected by each of the plurality of thermistors, so that a difference of a temperature rising amount per unit time among the plurality of heating regions at the start of an image heating operation becomes small and a total amount of power supplied to the plurality of heat generating elements is kept to within a predetermined limited power amount.

Image heating apparatus and image forming apparatus that correct an amount of current supplied to a plurality of heat generating resistors using detected temperatures

A heater used in a fixing device includes a substrate, a first heat generation resistor, a second heat generation resistor with a gap to the first heat generation resistor in the longitudinal direction, a first conductive pattern, a second conductive pattern, and the third conductive pattern, wherein a width of at least one of the first and second heat generation resistors in the transverse direction in a first area adjacent to the gap is smaller than the width in a second area, arranged adjacent to the first area, farther from the gap in the longitudinal direction than the first area.

Fixing device and heater used in fixing device

An image forming apparatus includes a fixing unit having a heater, an energization control unit configured to control energization to a first heat generation member of the heater depending on a temperature detected by a temperature detection element of the fixing unit, a resistance detecting unit configured to detect a resistance of a second heat generation member of the heater, and a temperature acquiring unit configured to acquire a temperature of the heater in the region in which the second heat generation member is formed based on the resistance detected by the resistance detecting unit. An image, formed on a recording material, is fixed to the recording material with heat form the heater.

Image forming apparatus that acquires a temperature of a heater in a region in which a heat generation member is formed based on a detected resistance of the heat generation member

A fixing apparatus includes a guide member that guides a rotating member. The guide member has a contact surface that restricts a position of the guide member with respect to a stay by coming into contact with a surface of the stay on the upstream side in a printing-material conveying direction. The contact surface is disposed, in a direction perpendicular to the printing-material conveying direction, in such a manner that a center is downstream from ends in the printing-material conveying direction.

Fixing apparatus having a restrictive guide member

An image forming apparatus includes a transfer unit, a fixing unit, and a control unit. The transfer unit transfers a toner image onto a sheet. The fixing unit fixes the toner image onto the sheet and includes a roller. The control unit controls a roller rotational speed. Where both a first loop amount of the sheet at one side in a width direction orthogonal to a sheet conveyance direction and a second loop amount of the sheet at the other side in a width direction are within a predetermined range, the control unit switches a roller rotational speed for controlling a loop amount of the sheet between the transfer unit and the fixing unit. Where either the first or second loop amount is not within the predetermined range, the control unit sets the roller rotational speed into a predetermined speed without switching the roller rotational speed.

Image forming apparatus to control rotational speed of a roller

An image forming apparatus includes a fixing unit, detection units, and a control unit. The control unit switches a sheet speed at the fixing unit to either a first or second sheet speed that is faster than the first sheet speed based on a first detection unit signal where the control unit detects that both a loop amount of a sheet loop at second and third detection unit positions are greater than or less than a predetermined amount. The control unit sets the fixing unit sheet speed as a predetermined sheet speed between the first and second sheet speed where the control unit detects that one of two loop amounts detected the second and third detection units is greater than the predetermined amount when the other one of the two loop amounts is less than the predetermined amount.

Image forming apparatus to control sheet conveyance speed

A fixing apparatus for fixing a toner image formed on a recording material includes a rotatable member; a cleaning unit for cleaning the rotatable member, the cleaning unit including a cleaning fabric for cleaning the rotatable member, a feeding roller on which the cleaning fabric is wound, and a winding-up roller for winding up the cleaning fabric fed from the feeding roller; and a load applying mechanism for applying a retarding force against a winding-up operation of the winding-up roller such that when a frictional force between the rotatable member and the cleaning fabric which is in a standstill state and which is in contact with the rotatable member which is rotating exceeds the retarding force of the load applying mechanism, the winding-up roller rotates to wind up the cleaning fabric.

Fixing apparatus provided with cleaning unit using cleaning fabric

An image forming apparatus includes a rotatable member-to-be-cleaned having elasticity; a cleaning member, having elasticity, for removing a deposited matter deposited on the member-to-be-cleaned; and a supporting portion for supporting the cleaning member so that the cleaning member swings around a swing fulcrum. The swing fulcrum of the supporting portion is provided so that a force exerted from the member-to-be-cleaned onto the cleaning member with respect to a direction along a tangential line where the cleaning member and the member-to-be-cleaned contact each other during movement of the member-to-be-cleaned has a vector component in a direction in which the cleaning member is moved away from the member-to-be-cleaned.

Growing community of inventors

Odawara, Japan

Kenji Takagi