Canon Kabushiki Kaisha

Munehito Kurata

Mahito Yoshioka

Noriaki Sato

Daizo Fukuzawa

Kuniaki Kasuga

Masahide Hirai

Tooru Imaizumi

Satoru Izawa

Ryo Suzuki

Shinji Hashiguchi

Tomonori Sato

Keisuke Mochizuki

Teruhiko Namiki

Hiromitsu Kumada

Yuuji Takayama

Atsunobu Mori

Hikaru Uchidate

Toshifumi Kitamura

Yasuhisa Matsumoto

Tetsuichiro Fujimoto

Satoru Koyama

Yoshimichi Ikeda

Atsushi Iwasaki

Hiroshi Hagiwara

Hideo Nanataki

Hiroshi Kataoka

Toru Imaizumi

Aoji Isono

Michio Uchida

Takaaki Akamatsu

Hiroyuki Sakakibara

Hisashi Nakahara

Satoru Taniguchi

Katsuhiko Shinjo

Satoshi Murasaki

Hirohiko Aiba

Masahito Omata

Takayuki Miyamoto

Daisuke Sato

Yoshihito Oshima

Kazuhiko Okazawa

Shizuma Nishimura

Hiroki Eguchi

Masaaki Nakamura

Hisahiro Saito

Yusuke Hirota

Hirokazu Okugawa

Masayuki Takao

Senju Sato

Koichi Sugawara

An image forming apparatus includes a sheet feeding cassette, a pickup roller to feed a sheet stored in the sheet feeding cassette, a conveyance roller, an image forming portion, first and second conveyance guides, a driving motor, a torque detection unit, and a control unit. The torque detection unit detects a value related to a driving torque of the driving motor produced in a period when the pickup roller feeds the sheet. The control unit determines an image forming condition under which image formation is to be performed on the sheet at the image forming portion. The control unit determines the image forming condition in accordance with a performed result of detection by the torque detection unit performed in a period in which the sheet is guided with both the first conveyance guide and the second conveyance guide by being conveyed with the conveyance roller and the sheet is bent.

Image forming apparatus

A grease composition for heat fixing devices contains a base oil and polytetrafluoroethylene. The base oil contains a perfluoropolyether having at least one of the structures represented by formulas (I) and (II) in the molecule and has a kinematic viscosity v40 of 800 mm/s to 2500 mm/s at 40° C., and whose kinematic viscosity v200 at 200° C. is 1/50 or less of the kinematic viscosity v40.

Grease composition for heat fixing devices and heat fixing 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.

The present invention provides an image heating apparatus including an acquiring portion which acquires thickness information of a recording material, and a control portion controls a power to be supplied to a heating element which heats a region where the recording material does not pass through among a plurality of heating regions based on a control target temperature which is set based on the thickness information.

Image heating apparatus and image forming apparatus

An image forming apparatus includes a control unit configured to, in executing a job to form images continuously on a plurality of sheets of a recording material, accumulate an addition amount per sheet to an index in accordance with a number of sheets of the recording material to which images are formed in the job. A value of the addition amount per sheet is determined in correspondence with an attribute of the recording material used in the job. The control unit is configured to, during execution of the job, change a throughput of the job so that images are formed at a first throughput if an accumulated value of the index still does not exceed a predetermined threshold value and images are formed at a second throughput slower than the first throughput if the accumulated value of the index has exceeded the threshold value.

Image forming apparatus that changes a throughput based on a value related to a number of sheets on which images have been formed

An image forming apparatus that forms an image on a recording material has a second image forming mode that (i) controls the target control temperature of a heater to be lower than in a normal image forming mode and at least (ii) extends a period of time from the start of image forming to a point of time at which the recording material reaches the nip portion to be longer than in the normal image forming mode based on (A) recording material information indicating the hardness of the recording material, at least one of (B) margin information indicating the size of the margin at the leading end in the transport direction of the recording material and (C) toner amount information at the leading end of the image formed on the recording material, and (D) information of an environment in which the image forming apparatus is installed.

Image forming apparatus that conditionally extends a preparatory rotation time until a recording material enters a fixing portion

In a fixing apparatushaving a heatercapable of selectively causing a plurality of heat generating blocks divided in a longitudinal direction of a substrateto generate heat, an energization control portionacquires, when performing a fixing operation, a cumulative amount of heat generation in each of a plurality of heating areas, a cumulative rotation time of a pressure roller, and information on a recording material that passes through a fixing nip portion, and controls energization of heat generating elementsandon the basis of the acquired information.

A supporting member supporting a heating member includes a lubricant storage portion storing a lubricant on an upstream side of a nip portion in a rotation direction of an endless film sliding with respect to the heating member. The supporting member further includes a lubricant supplying portion supplying the lubricant stored in the lubricant storage portion to an inner peripheral surface of the film. An amount of the lubricant supplied from the lubricant supplying portion to the inner peripheral surface of the film per unit time is larger in an area through which a small-sized recording material smaller than a maximum-sized recording material fixable by the image heating device does not pass in a longitudinal direction than in an area through which the small-sized recording material passes.

Image heating device that prevents failure caused by insufficient supply of lubricant at ends parts

A control unit of the invention compares printing setting suitable for a determined type of a recording material and printing setting of the recording material input by a user, and in a case where a difference between the printing setting suitable for the determined type of the recording material and the printing setting of the recording material input by the user falls in a predetermined range, the control unit performs a printing operation in accordance with the printing setting of the recording material input by the user, and in a case where the difference is greater than the predetermined range, the control unit performs the printing operation by changing the printing setting of the recording material input by the user, which is used when the difference is smaller than the predetermined range.

An image forming apparatus includes a fixing unit to fix a toner image which has been transferred onto a sheet by a transfer portion, a loop detector to detect an amount of a loop formed on the sheet at a position between the transfer portion and the fixing unit, and a controller to control a sheet conveyance speed of the fixing unit based on a detection result of the loop detector and control a rotational speed of rotary members to convey the sheet based on an area ratio which is a ratio of an area in which the toner image is formed by the transfer portion within a predetermined region set on a printing surface of the sheet onto which the toner image is transferred. The predetermined region is located at a position distant from a leading edge of the sheet more than a distance between the transfer portion and the fixing unit in the sheet conveyance direction.

Image forming apparatus having sheet loop control

The present disclosure relates to an image forming apparatus that forms toner images on a recording material. A control unit is configured to set, when performing fixing processing to fix a toner image onto the recording material, a first mode where thermal generation distribution of the heater is switched in accordance with electric power supply to the heater, a second mode where thermal generation distribution of the heater is switched in accordance with the electric power supply to the heater and temperature at the non-sheet-passing portion, and a third mode where the blower unit is driven in accordance with temperature at the non-sheet-passing portion.

Image forming apparatus and fixing device

Growing community of inventors

Suntou-gun, Japan

Munehito Kurata