Canon Kabushiki Kaisha

Yukihiro Fujiwara

Jiro Shirakata

Dai Kanai

Yoritsugu Maeda

Jun Nakazato

Jun Nakagaki

Satoshi Atarashi

Takahito Ueno

Atsushi Numagami

Kazunari Murayama

Takeshi Yasumoto

Shigeru Hoashi

Masahiko Yokota

Hiroshi Nakahata

Tetsuya Nagase

Toshihiko Kudo

Akio Ono

Fumio Tazawa

An image forming apparatus includes a rotatable belt member; a stretching roller for stretching the belt member; a plurality of line like marks which are arranged in a rotational direction of the belt member and are formed stepwisely on a surface of the belt member, the marks being tilted from a rotational axis direction of the belt member at least at end portions thereof on sides close to an end surface of the belt member; and control means for controlling rotation of the belt member on the basis of a result of detection of the marks.

Belt driving apparatus having belt with detection marks

An image-forming apparatus includes an image-bearing member configured to bear an image, a transfer belt to which the image on the image-bearing member is transferred and configured to transfer the image onto a sheet, a first drive unit configured to drive the image-bearing member to rotate, a second drive unit configured to drive the transfer belt to rotate via a speed reduction member interposed therebetween, a detection unit configured to detect a circumferential speed of the transfer belt, and a control unit configured to control the first drive unit in accordance with the circumferential speed of the transfer belt detected by the detection unit.

Image-forming apparatus

A rotary member apparatus includes a main drive unit configured to apply a driving torque to a photosensitive drum through a drive transfer unit, a torque limiter configured to limit the driving torque transmitted from the main drive unit to the photosensitive drum, a compensation drive unit configured to apply a torque for adjusting an angular velocity of the photosensitive drum, an encoder configured to detect the angular velocity of the photosensitive drum, and a compensation drive controller configured to control the torque applied by the compensation drive unit on the basis of a detection result obtained by the encoder.

Rotary member driving apparatus

The present invention relates to an image forming apparatus comprising: an exposing means and a developing means. The developing means comprises a plurality of developing devices, a rotating member rotatable while supporting the plurality of the developing devices, and a driving means for the rotation drive of the rotating member for selectively moving the plurality of the developing devices to the developing position such that the driving means transmits driving force to the rotating member via a gear at a drive transmitting position. An angle &#x3b8;e(&#xb0;) formed by a straight line linking the rotation center of the rotating member and the drive transmitting position and the tangent of the image bearing member at an exposing position in the image bearing member moving direction satisfies the following relationship with the premise that an pressure angle of the gear is &#x3b1;(&#xb0;) and the image bearing member rotating direction is positive:&#x2212;&#x3b1;&#x2266;&#x3b8;e&#x2266;&#x3b1;.

Image forming apparatus configured so that an angel is formed by straight line connecting a rotation center of a rotary and a drive transmitting position, and a tangent line at a transfer position of an image bearing member

A developer supply apparatus includes a portion receiving a developer supply container and being movable between mounting/demounting and developer supply positions, a mechanism for moving the container receiving portion between its two positions by a manually operable lever, and a mounting discrimination member on the container receiving portion movable therewith and operatively connected with the lever and provided for relative movement between the mounting discrimination member and a portion to be discriminated provided on the developer supply container in interrelation with a moving operation of the lever. When the mounting discrimination member makes relative movement to reach a regular position, the container receiving portion moves to the developer supply position, and when the mounting discrimination member makes relative movement, and the discrimination member interferes with the portion to be discriminated before reaching the regular position, the container receiving portion is prevented from moving to the developer supply position.

Developer supplying apparatus

The present invention relates to an image forming apparatus comprising: an exposing means and a developing means. The developing means comprises a plurality of developing devices, a rotating member rotatable while supporting the plurality of the developing devices, and a driving means for the rotation drive of the rotating member for selectively moving the plurality of the developing devices to the developing position such that the driving means transmits driving force to the rotating member via a gear at a drive transmitting position. An angle &#x3b8;e(&#xb0;) formed by a straight line linking the rotation center of the rotating member and the drive transmitting position and the tangent of the image bearing member at an exposing position in the image bearing member moving direction satisfies the following relationship with the premise that an pressure angle of the gear is &#x3b1;(&#xb0;) and the image bearing member rotating direction is positive: &#x2212;&#x3b1;&#x2266;&#x3b8;e&#x2266;&#x3b1;.

Image forming apparatus

A drive transmission apparatus includes a first coupling portion having a polygonal shape; a second coupling portion having a hole portion which has a cross-sectional configuration larger than the first coupling portion, the hole portion being engageable with the first coupling portion; and a center shaft provided on the first coupling or the second coupling, the center shaft penetrating the other one of the first and second coupling.

Growing community of inventors

Toride, Japan

Yukihiro Fujiwara