Fujitsu Corporation

Yoshikazu Yamamoto

Yukitoshi Takano

Megumi Yasuda

Katsumi Adachi

Hiroaki Yoshida

Yoshinori Wada

Masato Matsuzuki

Takashi Inui

Daisuke Fujii

Mie Toyohara

Mikio Koga

Akio Itabashi

This invention relates to a printing device that performs fixation after transfer, and which prevents the occurrence of no transfer even when feeding the paper backward starting printing from the next page after the final page. This printing device comprises image-formation units ( ) that transfer a toner image, a fixation unit ( ), and a control unit ( ). The control unit ( ) control adjustment of the moisture content on either the final page or leading page. In order to do that, it lowers the fixation energy of the fixation unit ( ) for the final page. There is a moisture-adjustment mechanism ( ) that reduces the moisture content of the leading page. Heat energy is applied to the leading page by the fixation unit ( ). This reduces the difference in the amount of shrinkage between the final page and the leading page, and prevents wrinkling of the leading page.

Printer for continuous forms with moisture adjustment

An image forming apparatus is provided with a fixing unit having at least one fixing heat roller and a plurality of heat sources with respect to the one fixing heat roller, and a control unit for setting a target temperature with respect to each of the plurality of heat sources and independently controlling each of the heat sources.

Image forming apparatus with controlled heat sources in fixing unit

An image forming apparatus includes a transport belt for transporting a medium, image forming units for transferring a toner image onto the medium transported by the transport belt, and contacting/separating mechanisms for moving at least one of the transport belt and the image forming units to a contact position where the transport belt and the image forming units contact each other and to a separated position where the transport belt and the image forming units are separated from each other, where the contacting/separating mechanisms move at least one of the transport belt and the image forming units to the contact position and/or the separated position in a state where a transport speed of the transport belt and a transfer speed of the image forming units are approximately the same.

Image forming apparatus

An image forming apparatus includes a plurality of image bearing members bearing latent images, image forming units for forming the latent images on the image bearing members, developing units for developing the latent images on the image bearing members, a transport belt for transporting a transfer member on which images of different colors developed by the developing units are successively transferred as the transfer member is transported, and image pickup elements, arranged obliquely to a main scan direction of the image forming units and located on a downstream of a most downstream one of the image bearing members along a direction in which the transport belt transports the transfer member. The image pickup elements detect as image information transmitted or reflected light quantity distributions of regions which include marks transferred on the transport belt from the image bearing members. The image forming apparatus further includes a correction unit for detecting correction quantities from error quantities of marks transferred from the image bearing members other than a reference image bearing member with respect to a reference mark transferred from the reference image bearing member based on the image information detected by the image pickup elements, and correcting positions of the latent images formed on the image bearing members other than the reference image bearing member depending on the correction quantities.

An image forming apparatus such as an electrophotographic printer forms an image on paper fed from a continuous paper supply in a first direction. A photosensitive drum carries a toner image and a transfer guide selectively moves the paper between a first position in which the paper contacts the drum and a second position in which the paper is separated from the drum. A tractor and a scuff roller are provided downstream of the transfer guide, relatively to the feed direction of the paper. A controller controls the tractor and the scuff roller so as to produce a relative velocity difference therebetween during an operation in which the paper, as fed from the continuous paper supply, is moved by the transfer guide.

Growing community of inventors

Kawasaki, Japan

Yoshikazu Yamamoto