Toshiba Tec Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Other

Tadao Kamano

Shinichiro Fujii

Yasuhiro Suzuki

Takashi Kashiwagi

Sakae Shiida

Akira Nuita

Hiroshi Yamaguchi

Takashi Ogiwara

Hitoshi Ushiogi

Yoshifumi Hasebe

Masaaki Oyaide

Hiroyuki Takada

Takuro Ito

Juntaro Oku

Hidenobu Suzuki

Akira Sato

Izumi Araki

Tsugio Narushima

Mitsuo Kubo

Hisashi Kimura

Satoshi Hasegawa

Shigeru Morino

Yoshihide Akuzawa

Hiroaki Watanabe

Kyouichi Shibata

Hiroyuki Hazu

An image forming apparatus comprises a main body, a conveyance path, a first external cover and a second external cover. The first cover provided in the main body to cover the conveyance path includes a blocking wall facing the conveyance path; a concave portion provided below the blocking wall and recessed toward the main body with respect to a lower end of the blocking wall; a communication portion, provided between the lower end of the blocking wall and an upper end of the concave portion, that penetrates the first external cover and faces an outer space of the image forming apparatus at a position that extends from the concave portion to the blocking wall; and an air exhaust portion provided above the blocking wall.

Image forming apparatus

An image forming apparatus comprises a paper feeding unit which feeds a sheet-shaped recording medium, an image forming unit which forms a toner image on the recording medium fed from the paper feeding unit, a fixing unit which fixes the toner image formed by the image forming unit on the recording medium, a stacking unit which stacks the recording medium on which the toner image is fixed by the fixing unit, a temperature sensor which detects the surface temperature of the recording mediums stacked on the stacking unit and a control unit which determines, according to the printing information of the recording medium, whether or not to feed a new recording medium from the paper feeding unit when the surface temperature of the recording mediums detected by the temperature sensor is above a threshold temperature.

According to one embodiment, there is provided an image forming apparatus including a fan and a duct. The fan and the duct are provided in a housing. If the fan is driven, the duct guides the air flowing into the housing from an intake port of the housing toward components in the housing. The duct includes a bent section that changes a flowing direction of the air. The bent section includes holes.

An image forming apparatus of an embodiment has a printer portion, a fan motor, a counter, a timer, and a control unit. The control unit calculates a time interval between print jobs from the difference between a printing completion time of a first print job and a printing start time of a second print job based on the value which is measured by the timer when the print jobs are continuously performed. Furthermore, the control unit starts driving of the fan motor when the operation time of the printer portion which is counted by the counter or a value replaced with the operation time of the printer portion is greater than or equal to a second threshold value.

Image forming apparatus and cooling control method for image forming apparatus

The transfer device transfers a toner image to a recording medium. The recording medium passes through a nip portion formed by a belt roller which is disposed on a main body of an apparatus and a transfer roller which is disposed on an opening and closing cover. The opening and closing cover opens and closes an opening of a main body of the apparatus. The main body includes a positioning member which positions the transfer roller which moves according to a closing operation of the opening and closing cover, to a predetermined distance with respect to the belt roller. The main body also includes an engaging member which engages with the transfer roller and pushes the transfer roller toward a positioning position of the positioning member, by being urged by a pressurizing spring.

Transfer device of image forming apparatus and related image forming apparatus

An image forming apparatus includes a rotatable developing device incorporating first developer units, a second developer unit disposed outside the rotatable developing device, a photoconductor on which a toner image can be formed by contact of each of the first and second developer units, and a driving motor for rotating the rotatable developing device. A first value of angular acceleration of the rotatable developing device when development performed by a first one of the first developer units proceeds to development performed by the second developer unit and a second value thereof when the development performed by the second developer unit proceeds to development performed by a second one of the first developer units are set to be smaller than a third value thereof when development performed by the second one of the first developer units proceeds to development performed by a next one of the first developer units.

Image forming apparatus and image forming method

A process unit includes a unit body, a photosensitive device set in the unit body and designed to have a toner image formed thereon, a transfer unit body set in the unit and swingable between a first position in which the transfer unit body is located close to the photosensitive device to form a conveyor path for conveying a recording sheet between the transfer unit body and the photosensitive device, and a second position at a distance from the first position, and a transfer device set in the transfer unit body and capable of transferring the toner image formed on the photosensitive device to the recording sheet.

Image forming apparatus having a process unit which enables a recording sheet jammed in a conveyor path to be easily removed without damage to a photosensitive device

An ink-jet printer includes a rotary drum , having a dielectric peripheral surface , for rotating at a constant speed, a sheet loader for loading a sheet to the rotary drum , a sheet holding system for causing the sheet to be held on the peripheral surface of the rotary drum , and a print head section for printing an image on the sheet held on the peripheral surface of the rotary drum by jetting ink to the sheet while the rotary drum makes a predetermined number of rotations. Particularly, the sheet holding system includes a charging section and a supplementary charger section . The charging section is charges the peripheral surface of the rotary drum on an upstream side of the loading point where the leading end of the sheet loaded by the sheet loader contacts the peripheral surface of the rotary drum . The supplementary charger section charges the sheet to supplement the electrostatic attraction force attenuated during the rotation of the rotary drum

Ink-jet printer

A head loading device includes a print head for ejecting ink from a print position adjacent to a paper sheet to print an image with the ink, and an elevator for moving the print head upward from the print position at the time of non-printing and downward to the print position at the time of printing. The head loading device further includes a three-point support mechanism for supporting, at three points, the print head moved to the print position by the elevator to hold the print head at a preset distance from the paper sheet.

Head loading device

An ink-jet printer includes a rotary drum for rotating at a constant speed, a sheet loader for loading a paper sheet onto the rotary drum a sheet holding system for holding the paper sheet loaded by the sheet loader on the rotary drum and a print head for printing an image by ejecting ink onto the paper sheet which is held on the rotary drum by the sheet holding system and rotated together with the rotary drum In particular, the sheet loader has a pair of loading rollers and for feeding the paper sheet while pinching the paper sheet, and a roller moving mechanism for separating the loading roller from the other loading roller to release the paper sheet after the leading edge of the paper sheet has been held on the rotary drum

Toner cartridge

An ink-jet printer includes a sheet feed-in mechanism,for feeding a paper sheet, a rotary drum,having a peripheral surface,of a size larger than the paper sheet to be fed by the sheet feed-in mechanism,, for rotating at a constant speed, a sheet holding system,for holding the paper sheet on the peripheral surface of the rotary drum, a print head,for printing an image by repeatedly ejecting ink onto the paper sheet held on the peripheral surface of the rotary drum,while the rotary drum,performs a predetermined number of rotations, a sheet separator,for separating the paper sheet from the peripheral surface,of the rotary drum, a sheet feed-out mechanism,for feeding out the paper sheet separated by the sheet separator,, a control unit,for controlling the sheet feed-in mechanism,, the rotary drum,, the sheet holding system,, the print head,, the sheet separator,and the sheet feed-out mechanism,. In particular, the control unit,is constructed such that the sheet holding system,, the print head,and the sheet separator,are sequentially driven on the basis of the number of rotations of the rotary drum

An ink-jet printer includes a rotary drum,, having a dielectric peripheral surface,for rotating at a constant speed, a sheet loader,for loading a sheet to the rotary drum,, a sheet holding system for causing the sheet to be held on the peripheral surface,of the rotary drum,, and a print head section,for printing an image on the sheet held on the peripheral surface,of the rotary drum,by jetting ink to the sheet while the rotary drum,makes a predetermined number of rotations. Particularly, the sheet holding system includes a charging section,and a supplementary charger section,. The charging section,charges the peripheral surface,of the rotary drum,on an upstream side of the loading point where the leading end of the sheet loaded by the sheet loader,contacts the peripheral surface,of the rotary drum,. The supplementary charger section,charges the sheet to supplement the electrostatic attraction force attenuated during the rotation of the rotary drum

A sheet unloading apparatus is used for rotary drum rotatable in one direction along with a paper sheet which is wound around a peripheral surface of the rotary drum and at rear end mechanically engaged in an engagement groove formed in the peripheral surface. The sheet unloading apparatus includes a separation paws for separating a front end of the paper sheet from the rotary drum by contacting the peripheral surface of the rotary drum while the rotary drum rotates in the one direction, and a pair of pinch rollers for rotating to pinch and feed out the paper sheet supplied according to the rotation of the rotary drum in a state where the front end of the paper sheet is separated from the rotary drum by the separation pawl and the rear end of the paper sheet is engaged in the engagement groove. Particularly, the unloading apparatus further include a removal assisting mechanism for assisting the paper sheet to be pulled out from the engagement groove by bending the paper sheet spanning between the rotary drum and the pair of pinch rollers.

Growing community of inventors

Shizuoka-ken, Japan

Tadao Kamano