Ricoh Company, Ltd.

Ricoh Printing Systems, Ltd.

Yuji Ohmura

Sho Sawahata

Tsukasa Onose

Hidenori Iwanaga

Takeshi Terakado

Yoshikuni Sasaki

Souichi Nakazawa

Toru Kikuchi

By executing low-speed conveyance of web by a web feeding mechanism before the printing operation begins, slack W, W, and Win the web located downstream of the guide rollers, and the slacked web is accumulated in the air loop portion, thereby completing the standby for printing. At that time, the amount of web conveyance (accumulation) is saved. Then, high-speed printing operation begins, and when the amount of printing has reached the amount of web conveyance saved, high-speed conveyance by the web feeding mechanism begins.

Web conveyance method and apparatus of tandem printing system

According to an aspect of the present invention, there is provided a fixing apparatus including: a heat roller that includes: a heat source that generates heat to be supplied on a toner image formed on a recording medium; a cylindrical core; a rubber layer that is formed on the cylindrical core and includes a thermal-conductivity-enhanced rubber, the rubber layer having a thickness of Tg that satisfies 200 &#x3bc;m&#x2266;Tg&#x2266;600 &#x3bc;m and having a rubber hardness defined by JIS-A hardness of Hg that satisfies 40 degrees&#x2266;Hg&#x2266;80 degrees; and a fluororesin layer that is formed on the rubber layer, the fluororesin layer having a thickness of Tj that satisfies 80 &#x3bc;m&#x2266;Tj&#x2266;300 &#x3bc;m and 2 Tj&#x2266;Tg&#x2266;10 Tj; and a pressure roller that presses the recording medium against the heat roller.

Fixing apparatus and image forming apparatus using it

A web transporting mechanism of a printing apparatus has a buffer mechanism section for absorbing a fluctuation of the web length from a transporting section to a fixing section generated by a difference between a speed of transporting a web in the transporting section and a speed of transporting a web in the fixing section. The web transporting mechanism includes at least one brake member suppressing a motion of a movable buffer. The brake member has a drive means.

Web transporting mechanism of printing apparatus

A printing apparatus includes a conveyance mechanism for conveying a web to a transfer unit, and a tension generating mechanism for applying a tension to the web fed to the conveyance mechanism, wherein the tension generating mechanism includes a tension generating roller for changing the tension to be applied to the web in accordance with the rotational position, a tension guide that is rotated in accordance with the magnitude of tension generated by the roller, a first sensor for sensing the rotational position of the tension guide, a second sensor for sensing the rotational position of the tension generating roller, and a driver for controlling the rotation of the motor in accordance with the outputs of the first and second sensors.

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Ibaraki, Japan

Yuji Ohmura