Ricoh Company, Ltd.

Hiroyasu Shijo

Masumi Sato

Motokazu Yasui

Tomotoshi Nakahara

Kazuhiko Kobayashi

Tetsuo Yamanaka

Hiroshi Ishii

Makoto Kikura

Kazuosa Kuma

Yutaka Fukuchi

Kazuki Suzuki

Yuusuke Noguchi

Yuzo Katsumata

Tadashi Shinohara

Akihisa Itabashi

Kouta Fujimori

Fumio Kishi

Hiromichi Ema

Mineyo Takahashi

Jun Hosokawa

Hiroyasu Sumida

Hiroshi Takashima

Yoshiaki Kanmoto

Kohtaroh Yonenaga

Hiroshi Fukano

Haruhiko Fukuda

Motonori Hanada

Yuzoh Katsumata

Takeshi Ogiwara

Masumi Satp

The color image forming apparatus comprises a transfer belt device which feeds a transfer member such as a paper and a plurality of image forming units. The image forming units are disposed facing toward the transfer belt device. The transfer belt device, at least in a portion in which the image forming units have been disposed, is arranged such that it is inclined with respect to the ground. Each of the image forming unit forms a desired image and sequentially transfers the formed image on the transfer member fed by the transfer belt device.

Color image forming apparatus, and toner replenishing apparatus

An image forming apparatus of the present invention includes image carriers arranged side by side in a preselected direction, developing means each for forming a toner image on one of the image carriers, a drive mechanism for driving in the preselected direction a member to which toner images are to be sequentially transferred from the image carriers one above the other, and image transferring devices each for transferring a toner image from one of the image carriers to the above member. At east during an image forming process, a slip condition is substantially the same throughout all image transfer positions where the image carriers face the members.

Image forming apparatus including controller driving image carriers

The present invention relates to an electrophotographic color image forming apparatus using a tandem-drum development, an indirect image-transfer method, and a vertical sheet supply path. An intermediate image-transfer member is angled relative to a horizontal line such that a rear side of the intermediate image-transfer member away from a recording sheet is lifted and a front side of the intermediate image-transfer member closer to the recording sheet is lowered. Further, image creating mechanisms of the tandem-drum development are aligned and arranged in parallel to a moving image transfer bed of the intermediate image-transfer member, such that one of the image creating mechanisms firstly forming an image faces the rear side of the moving image transfer bed and another one of the image creating mechanisms lastly forming an image faces the front side.

Desktop color image forming apparatus and method of making the same

An image forming apparatus of the present invention includes image carriers arranged side by side in a preselected direction, developing means each for forming a toner image on one of the image carriers, a drive mechanism for driving in the preselected direction a member to which toner images are to be sequentially transferred from the image carriers one above the other, and image transferring devices each for transferring a toner image from one of the image carriers to the above member. At least during an image forming process, a slip condition is substantially the same throughout all image transfer positions where the image carriers face the member.

The color image forming apparatus comprises a transfer belt device which feeds a transfer member such as a paper and a plurality of image forming units. The image forming units are disposed facing towards the transfer belt device. The transfer belt device, at least in a portion in which the image forming units have been disposed, is arranged such that it is inclined with respect to the ground. Each of the image forming unit forms a desired image and sequentially transfers the formed image on the transfer member fed by the transfer belt device.

An image forming apparatus of the present invention includes image carriers arranged side by side in a preselected direction, developing mechanisms configured to form a toner image on one of the image carriers, a drive mechanism for driving in the preselected direction a member to which toner images are to be sequentially transferred from the image carriers one above the other, and image transferring devices each for transferring a toner image from one of the image carriers to the above member. At least during an image forming process, a slip condition is substantially the same throughout all image transfer positions where the image carriers face the member.

A mark pattern forming unit forms a mark pattern on a transfer belt, and a reflection type optical sensor detects the mark pattern. An interval difference acquiring unit acquires an interval difference that is a deviation of each mark from a reference position. A speed detector detects a moving speed vof the transfer belt in a period between formation of the mark pattern and the detection of the mark pattern, and a moving speed vduring image formation. A speed difference calculating unit calculates a speed difference &#x394;v=v&#x2212;v, and a control unit controls a timing of forming an image based on the interval difference and the value of &#x394;v so as to reduce position misalignment.

Color image forming apparatus, tandem type color image forming apparatus, and process cartridge for color image forming apparatus

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Tokyo, Japan

Hiroyasu Shijo