Toshiba Tec Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Masataka Muratani

Toshihiro Matsushima

Kazumasa Yasui

Toshiaki Tanaka

Masaya Arakawa

An interlock switch is switched according to the movement of a relay reversal unit rather than the movement of a front cover. The relay reversal unit is connected to a driver substrate by a drawer connector. The change-over of the interlock switch according to the movement of the relay reversal unit is turned off when margin time elapses after a cover detection switch is turned off.

Conveying unit for image forming apparatus

An ADU is turned around a first hole section that operates as fulcrum and opened by a first angle relative to the lateral side of an apparatus main body when dissolving a jam. The lateral side cover is temporarily taken away from a stationary side plate when maintenance the inside of a color copying machine. Then, a second engaging pin is put into a second hole section to engage the lateral side cover with the stationary side plate. The ADU is turned around the second hole section that operates as fulcrum and opened by a second angle greater than the first angle.

Image forming apparatus and opening/closing method of re-conveyance mechanism

A technique in an image forming apparatus in which the front and back sides of a sheet are reversed by using a reversal conveyance path is provided for causing the sheet to wait such that the sheet is not damaged when a unit for conveying the sheet to the reversal conveyance path is pulled out for the purpose of clearing a jam or the like. A roller for conveying the sheet is controlled such that the sheet to be turned back and directed into the reversal conveyance path is caused to wait until the sheet can be conveyed into the reversal conveyance path. As a standby position of the sheet while the sheet is caused to wait, a position is set such that an upstream end portion in the second conveying direction of the sheet to be directed into the reversal conveyance path does not extend for a predetermined length or longer into another conveyance unit adjacent to the intermediate conveyance unit upstream from the intermediate conveyance unit in the second conveying direction.

Image forming apparatus, sheet conveying method, and program for sheet conveyance

An ADU transport roller driving device, an image forming apparatus and an ADU transport roller driving method, in which a phenomenon of a warp does not occur on a succeeding sheet, are provided. There are included one drive motor that drives plural transport rollers to transport sheets in an ADU, a first one-way clutch that transmits only rotation force of the drive motor in a forward direction to an entrance side transport roller disposed at an ADU entrance side in a sheet transport direction among the plural transport rollers, a second one-way clutch that transmits only rotation force of the drive motor in a reverse direction of an opposite direction to the forward direction to an exit side transport roller disposed at an ADU exit side in the sheet transport direction among the plural transport rollers, and an electromagnetic clutch capable of transmitting only the rotation force of the drive motor in the forward direction to the exit side transport roller.

ADU transport roller driving device, image forming apparatus, ADU transport roller driving method

When an image is to be formed on a second surface of a paper sheet in a double-side printing operation, a main CPU corrects a main-scan magnification and a sub-scan magnification for printing on the second surface, by using correction data relating to the main-scan magnification and sub-scan magnification on the second surface, which is prestored in a RAM.

Image forming apparatus and image forming method

An image forming apparatus of this invention is provided with a conveying guide that is curved in the direction reverse to the curved shape of a nip portion of a fixing unit in order for leading sheet paper that is vertically conveyed at the time of fixing in the horizontal direction and the top of the curved portion of the conveying guide is constructed with a guide belt. The contacting force of the curl correction unit with the guide belt of the curl correction unit is adjusted according to amount of curl of sheet paper produced at the time of fixing and corrects the curve of sheet paper properly.

Image forming apparatus

The image forming apparatus having an image deviation correction function of the present invention measures passing waveforms of correction patterns on a transfer belt printed in the main scanning direction in a relationship of a reflected image and correction patterns thermally fixed on a sheet of paper by detection sensors and from measured results, obtains main scanning magnification Spand center position deviation amount Zfor double-side horizontal deviation correction with high accuracy. During double-side image forming, a toner image on the first side is printed at a main scanning magnification of 100%, while a toner image on the second side is printed using a correction signal to which main scanning magnification Spand center position deviation amount Zare applied, thus horizontal deviation of double-side image forming is corrected.

Image forming apparatus with image deviation correction function

The paper feeder of the present invention includes paper supply cassettes to house sheets of paper; friction paper pickup rollers to take out sheets of paper one by one by contacting a paper placed at the top of paper in the paper supply cassettes; openings formed on the paper supply cassettes to pass the air to the side of the paper at the downstream position from the friction pickup rollers; and air blowing mechanisms to blow the air into the openings. This paper feeder is used for supplying paper for an image forming apparatus.

Sheet feeding device, sheet feeding method and image forming apparatus

An image forming apparatus of the present invention comprising image forming sections for forming images by using developer, a supplying/transporting mechanism for feeding image formation media toward the image forming sections, identifying device for performing identification of the type of the image formation media, and a transportation speed adjusting unit for performing adjustment of the speed of transportation by the supplying/transporting mechanism for the 5image formation media. The adjustment is performed according to outputs from the identifying device, and an identification reference adjusting section for adjusting a reference value E used for identification of the image formation media. This allows the identifying section to securely identify the type of the image formation media.

Growing community of inventors

Tokyo, Japan

Masataka Muratani