Canon Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubishi Heavy Industries Limited

Japan Vilene Company, Ltd.

Mitsubishi Denki Kabushiki Kaisha

Mitsui Petrochemical Industries, Ltd.

Miyoshi Kasei, Inc.

Yasushi Takeuchi

Yuichi Ikeda

Yusuke Ishida

Hiroaki Yamazaki

Takanori Iida

Toshiyuki Yamada

Masaaki Kawabe

Jun Tomine

Kazuya Sato

Jun Mochizuki

Yasuhito Shirafuji

Kazukiyo Akashi

Yuichi Yamamoto

Kuniyasu Kimura

Yoshihito Osari

Eiichi Motoyama

Hiroaki Tomiyasu

Masahiko Mega

Hideho Inagawa

Takahiko Yamaoka

Yoshimi Terayama

Toshiya Kobayashi

Tomoaki Kitagawa

Toru Otaki

Shiro Higashikozono

Ken Fujita

Toshihiko Tsunatani

Genya Anan

Hiroto Kakinuma

Masashi Kaneko

Tomoyasu Arakawa

Masahiro Arioka

Takahiro Nakase

Kenichi Koyama

Taisuke Matsuura

Ryuta Ai

Mitsuru Tsukima

Takehiro Kishi

Toshie Takeuchi

Michihito Yamazaki

Tohru Ohsaka

Hideki Fujita

Masaakira Horino

Koji Arimura

Yuichiro Murata

Kosuke Takeuchi

Yoshiyuki Inoue

Daisuke Makino

Yukari Shibuya

Kunio Satomi

Koji Tsukimoto

Takehiro Suzuki

Takayuki Handa

Tatsuya Inoue

Takayuki Ganko

Toru Osaka

Shinya Kuwazuru

Yosuke Kawachi

Takakazu Inoue

Hisazi Seki

Yuki Osame

Hiromi Honda

Kousuke Takeuchi

Masumi Kato

An image forming apparatus includes a rotatable photosensitive member, a charging member, a developing device, a blade, a detecting portion, and a controller. The controller causes the photosensitive member to rotate through one full circumference or more on the following conditions during a predetermined operation: (i) a voltage which is a discharge start voltage or more is applied to the charging member, and (ii) an operation condition of the developing device is a first condition on which an amount of fog toner deposited from the developer carrying member on the photosensitive member is less than an amount of the fog toner in a second condition which is an operation condition of the developing device during a sheet interval before the image formation during the continuous image formation is interrupted.

Image forming apparatus

A cleaning process (blasted-particles cleaning process) includes performing, a plural number of consecutive cycles, an ultrasonic cleaning treatment including immersing a turbine rotor blade in a water basin and conducting an ultrasonic wave into the water basin to clean the turbine rotor blade, and a pressurized-water cleaning treatment including spraying pressurized water into an internal cooling flow channel after the ultrasonic cleaning treatment is performed. The cleaning process is performed after a bonding coat layer removing process of removing a bonding coat layer (first coating layer) by chemical treatment, and a cleaning process of cleaning the turbine blade by blast treatment. Heat tinging process is then performed.

Turbine blade maintenance method

An image forming apparatus includes an image bearing member; an intermediary image transfer belt; primary and secondary transfer members; a first cleaning member; a second cleaning member; an electrical discharge member; a voltage source for supplying a voltage to produce the discharge current; and a controller, which controls the voltage source such that an absolute value of a first current balance is not more than 50% of an absolute value of a second current balance. The first current balance is a sum of a primary transferring current, a secondary-transfer current, a first cleaning current, a second cleaning current and a discharge current at the time when an image region on the belt passes the primary transfer member, the secondary transfer member, the first cleaning member, the second cleaning member and the discharge member, respectively, and the second balance is the first balance minus the discharge current.

An image forming apparatus includes a photosensitive member; a charging device, a developing device, a transfer device, and a controller. The controller is capable of executing an operation in a first mode in which an image forming operation is controlled so that an exposure start enable timing is set during movement of the photosensitive member through one full circumference from first passing, through an exposure position, of a region of the photosensitive member which has passed through a charging position, and executing an operation in a second mode in which an image forming operation is controlled so that the exposure start enable timing is set after the movement of the photosensitive member. On the basis of image information of the first sheet of an image forming job, the controller selects an executing mode from a plurality of modes including at least the first mode and the second mode.

Image forming apparatus having variable exposure start timing depending on image information

A developing device includes a developing container, a developing sleeve, a magnet and grooves provided at a surface of the sleeve and formed along a direction crossing a circumferential direction of the sleeve. In a cross-section, each of the grooves is formed by a flat bottom portion contacting a carrier particle and a pair of side surface portions provided in both sides of the flat bottom portion with respect to the circumferential direction of the sleeve and satisfies the following relationship:&#x3c;22&#xd7;, and/2&#x2264;&#x3c;2 In the above, r is a volume-average particle size of the carrier particles, w is a length of the flat bottom portion, L is a width between the side surface portions at the surface of the sleeve, and s is a depth of each of the grooves.

Developing device

In the present invention, an image forming apparatus using a method of replacing a developer is configured such that an immobile area in which the heights of a discharge passage and a conveyance passage are changed on the upstream side of a returning screw is filled. This causes the immobile area of the developer to be unlikely to occur and accordingly suppresses formation of a toner stain image due to an aggregation toner, enabling stable image formation over a long period of time.

Developing device and conveying screw for developing an electrostatic latent image on an image bearing member

When ending image forming, a state is realized where charging by a charging roller is stopped (charging bias off) and also applying DC voltage at a developing device is stopped (developing bias DC off). In this state, AC voltage is applied to the developing device (developing bias AC on), thereby adhering toner to the surface of a photosensitive drum and forming interposing toner. Driving of the photosensitive drum and an intermediate transfer belt is then stopped in the state with the interposing toner interposed between the photosensitive drum and intermediate transfer belt.

Image forming apparatus to suppress excessive interposing toner

A developing device includes a developing container, a developing sleeve, a magnet and grooves provided at a surface of the sleeve and formed along a direction crossing a circumferential direction of the sleeve. In a cross-section, each of the grooves is formed by a flat bottom portion contacting a carrier particle and a pair of side surface portions provided in both sides of the flat bottom portion with respect to the circumferential direction of the sleeve and satisfies the following relationship:22&#xd7;and2&#x2266;&#x3c;2 In the above, r is a volume-average particle size of the carrier particles, w is a length of the flat bottom portion, L is a width between the side surface portions at the surface of the sleeve, and s is a depth of each of the grooves.

Removal control performing both first and second control in series is performed. The first control involves rotating the plurality of developer bearing members in a state in which the developing bias is applied to the plurality of developer bearing members so that force acting on opposite-polarity particles from a normally charged toner in the direction of moving the particles from the developer bearing member toward the image bearing member. The second control involves rotating one developer bearing member at a faster circumferential velocity than the other developer bearing member in a state in which the developing bias is applied to the plurality of developer bearing members or the developing bias is turned off so that the force acting on the opposite-polarity particles from the normally charged toner in the direction of moving the particles from the developer bearing member toward the image bearing member.

Image forming apparatus configured to execute removal control

There is provided an electromagnetic operation device for a vacuum circuit breaker, which controls by its electromagnetic operation, a speed of contact switching operation of a vacuum switch tube used in the vacuum circuit breaker, the electromagnetic operation device including a closing drive coil for the vacuum switch tube; and a first temperature sensor that measures a temperature surrounding the closing drive coil, wherein a current caused to flow through the closing drive coil is controlled based on the temperature measured by the first temperature sensor.

Electromagnetic operation device for vacuum circuit breaker

A toner image for measurement of an area coverage modulation of 90% or more is formed on a photosensitive drum in a non-image formation, and a setting condition for defining a developability of a toner image in an image formation is set so that a detection result of an optical sensor detecting the toner image for measurement becomes a preset target value. The target value is set to be lower as a value of the setting condition increases from a lower side to a higher side of the developability. The target value is set so that a color difference &#x394;E of an image having half the maximum image density obtained after the setting condition is set with respect to an image having half the maximum image density obtained after the setting condition is set in a setting mode with use of unused developer is 6.5 or less.

Image forming apparatus with developing contrast control

An image forming apparatus includes an image carrying member for carrying a toner image; an intermediary member for carrying the toner image transferred from the image carrying member; a first transfer member for transferring the toner image from the intermediary member onto a sheet, the first transfer member having a first resistance and being contacted to the intermediary member; a second transfer member for transferring the toner image from the intermediary member onto the sheet, the second transfer member having a second resistance higher than the first resistance and being contacted to the intermediary member at a position downstream of the first transfer member; and a voltage applying source, connected to both of said first and second transfer members, for applying the same voltage to the first and second transfer members to transfer the toner image onto the sheet.

In an image forming apparatus, a voltage applied to a pre-transfer charger is set to the highest voltage, and is then reduced at a position corresponding to a predetermined range from a leading edge of a recording material, to suppress a phenomenon of backward scattering of toner formed just before entering a transfer nip, when a burr formed on the leading edge of the recording material exits the transfer nip.

A first transfer inner roller and a first transfer outer roller are arranged such that the leading edge of a recording material is pressed against an intermediate transfer member on the downstream side of an upstream side transfer portion to change a traveling direction of the recording material.

In a gas-turbine-stator-vane insert removing device with which welding metal that connects an insert collar, which protrudes outward from an outer circumferential surface of an insert, and a stator-vane-outer-shroud non-gas path surface, which surrounds the periphery of the insert collar, is removed by means of an arc discharge repeated at a short cycle between an electrode and a gas-turbine stator vane, a bottom surface of the electrode has the same plan-view shape as a plan-view shape of the welding metal.

Gas-turbine-stator-vane insert removing device and method of removing gas-turbine-stator-vane insert

Growing community of inventors

Moriya, Japan

Yasushi Takeuchi