Ricoh Company, Ltd.

Yasukuni Omata

Hideaki Mochimaru

Norimasa Sohmiya

Chiemi Kaneko

Hisao Murayama

Shigeru Watanabe

Hiroshi Yokoyama

Koji Suzuki

Naoki Iwata

Kunihiko Tomita

Hirokatsu Suzuki

Toshiaki Higaya

Mitsuru Seto

Kenichi Taguma

Emiko Ishikawa

Masanori Matsuda

Yuzo Kouno

An image forming method and apparatus includes a first image carrying member, a first transfix unit, a second image carrying member, and a second transfix unit. The first image carrying member carries a first toner image thereon. The first transfix unit receives the first toner image from the first image carrying member and transfers and fixes the first toner image onto a first face of a recording sheet with a heat effect. The second image carrying member carries a second toner image thereon. The second transfix unit receives the second toner image from the second image carrying member and transfers and fixes the second toner image onto a second face of the recording sheet with a heat effect.

Image forming method and apparatus for transfer and fixing image with one process

An image forming apparatus including a plurality of photoconductive elements arranged on an inclined plane with respect to the ground, a plurality of developing devices, each of the plurality of developing devices corresponding to one of the plurality of photoconductive elements and configured to develop an image on a corresponding one of the plurality of photoconductive elements and a plurality of mirrors and a polygon mirror disposed inside a single housing and configured to reflect light beams to the plurality of photoconductive elements, the housing being arranged parallel to the inclining plane and below the plurality of photoconductive elements.

Image forming apparatus including a plurality of photoconductive elements developing devices and mirrors

An image forming apparatus includes a first image carrying belt, a second image carrying belt, a first transfer unit, a second transfer unit, a fixing unit, and a controller. Each of the first and second image carrying belt carries a toner image on their respective surface. The first and second transfer unit transfer the toner image from the respective first and second image carrying belt to a first and second face of a recording medium, respectively. The fixing unit receives the recording medium directly from the second image carrying belt and fixes the toner image on the respective first and second face of the recording medium. The controller variably controls a transport speed of the second image carrying belt depending on types of the recording medium when the second image carrying belt transports the recording medium from the second transfer unit to the fixing unit.

Image forming apparatus for higher speed printing

An image forming method begins with a first image transfer step for thermally transferring a first toner image from a first image carrier to a second image carrier contacting it. Subsequently, in a second image transfer step, the first toner image carried on the second image carrier and a second toner image newly formed on the first image carrier are thermally transferred to opposite sides of a recording medium substantially at the same time. Higher image transfer temperature is assigned to the second image transfer step than to the first image transfer step. An impurity collecting device is associated with a pair of registration rollers which stop the recording medium for a moment to thereby synchronize the recording medium to the toner image.

Image forming apparatus and an impurity collecting device associated with registration rollers

A one-pass system image forming apparatus for forming an image on both sides of a recording medium is capable of easily suppressing image disturbance caused when an unfixed toner image suffers abrasion when a sheet of transfer paper is conveyed from double-sided transfer means to a fixing device, and image disturbance caused when toner that has become adhered to a guide portion for guiding the transfer paper from the double-sided transfer means to a fixing nip of the fixing device is transferred to a subsequent sheet of transfer paper.

Image forming apparatus including a conveyance unit for passing a recording medium

An image forming apparatus includes an optical unit emitting light in accordance with image information that is inclined in a prescribed direction. At least two image bearing members bearing a latent image formed by the light emitted from the optical unit are provided that have shafts arranged on a line inclining in the prescribed direction. At least two developing units are provided for developing the at least two latent images with toner. Shafts of the at least two developing means units are also arranged on a line inclining in the prescribed direction. An intermediate transfer belt is provided to receive and superimpose the toner images from the at least two image bearing members at a first transfer station. The intermediate transfer belt also inclines in the prescribed direction. A transfer unit is connected to a cover of a main body and transfers the superimposed toner images from the intermediate transfer belt to a recording medium at a second transfer station. This transfer unit is arranged in a vicinity of the lower end of the intermediate transfer belt with the transfer unit being separated from the intermediate transfer belt when the cover is opened.

Image forming apparatus and belt unit therefor, and image forming system

An image forming apparatus capable of forming images on both sides of a recording medium of the present invention includes a first image carrier on which a toner image to be formed, and a second image carrier to which the toner image is transferred from the first image carrier. The toner image transferred from the image carrier to the second image carrier is transferred to one side of the recording medium while a toner image is transferred from the first image carrier to the other side of the recording medium. After the toner image has been transferred from the first image carrier to the second image carrier, the running condition of the second image carrier is varied.

Image forming apparatus operable in a duplex print mode

An image transferring device of the present invention includes a first and a second intermediate image transfer body whose surfaces endlessly move while forming a nip in contact with each other. When a sheet nipped by the nip is being conveyed toward a side downstream of the nip in the direction in which the above surfaces move, a first toner image transferred from an image carrier to the second intermediate image transfer body via the first intermediate image transfer body beforehand is transferred to one side of the sheet. At the same time, a second toner image transferred from the image carrier to the first image transfer body beforehand is transferred to the other side of the sheet. One of the two intermediate image transfer bodies is less deformable than the other intermediate image transfer body in the direction of thickness.

Method, system and apparatus for transferring toner images to both sides of a recording medium

An image forming apparatus includes first and second image carrying members, ejection trays, and a sheet transferring mechanism. The first image carrying member carries images in increasing order of corresponding sheet numbers. The second image carrying member carries an image transferred from the first image carrying member. The ejection trays include a first ejection tray, which stacks output sheets in a straight or forward orientation, and a second ejection tray, which stacks output sheets in a reversed orientation. The sheet transferring mechanism transfers a recording sheet to the first and second image carrying members. The first and second image carrying members transfer images onto both first and second surfaces of the recording sheet, at the same time, in response to a selection between the first and second ejection trays in a double-sided recording mode so that the first and second ejection trays stack the recording sheets in increasing order of page numbers.

Method and apparatus for image forming capable of effectively collating a stack of single-/double-sided recording sheets in a desired ejection tray

An image forming apparatus includes at least one image bearing member. A visual image forming device forms the visual images on the at least one image bearing member. A two-side transfer device transfers the visual images on the at least one image bearing member onto both sides of the recording medium held on a recording medium holding member. A fixing device fixes the visual images transferred onto the both sides of the recording medium. A recording medium conveying device including at least one recording medium supporting member supports the recording medium. The recording medium conveying device is positioned between the two-side transfer device and the fixing device, and conveys the recording medium from the two-side transfer device to the fixing device while supporting a non-image portion of the recording medium by the at least one recording medium supporting member.

Recording medium supporting member, recording medium conveying device for use in image forming apparatus and image forming system, and image forming method

An image forming method of the present invention begins with a first image transfer step for thermally transferring a first toner image from a first image carrier to a second image carrier contacting it. Subsequently, in a second image transfer step, the first toner image carried on the second image carrier and a second toner image newly formed on the first image carrier are thermally transferred to opposite sides of a recording medium substantially at the same time. Higher image transfer temperature is assigned to the second image transfer step than to the first image transfer step. Additionally, the second image carrier has a greater roughness than the first image carrier.

Image forming method having transfer temperature difference and apparatus for the same

An image transferring device of the present invention includes a first and a second intermediate image transfer body whose surfaces endlessly move while forming a nip in contact with ech other. When a sheet nipped by the nip is being conveyed toward a side downstream of the nip in the direction in which the above surfaces move, a first toner image transferred from an image carrier to the second intermediate image transfer body via the first intermediate image transfer body beforehand is transferred to one side of the sheet. At the same time, a second toner image transferred from the image carrier to the first image transfer body beforehand is transferred to the other side of the sheet. One of the two intermediate image transfer bodies is less deformable than the other intermediate image transfer body in the direction of thickness.

Image forming apparatus and image forming system including the same

An image forming apparatus of the present invention includes a first and a second intermediate image transfer belt contacting each other to form a nip for secondary image transfer. While the nip is heated, a sheet is passed through the nip to thereby transfer toner images respectively formed on the first and second belts to opposite surfaces of the sheet at the same time. The nip is sized such that image transfer and fixation can be effected at temperature higher than the melting point or the softening point of toner by 5&#xb0; C. to 50&#xb0; C.

Image forming apparatus configured for double sided printing

An image forming apparatus having a visible image bearing member in a main housing a recording medium conveying path formed in the main housing, and an installing part provided in the main housing that provides or easy installation and removal of any of at least two devices, with at least one of the two devices providing for transferring the visible image from the visible image bearing member to an intermediary image bearing member in the at least one device prior to forming the final image on the recording medium.

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Kanagawa, Japan

Yasukuni Omata