Sharp Kabushiki Kaisha Corporation

Shotaro Okamoto

Yasumasa Morimoto

Masaki Saka

Seiichi Kizu

An image forming apparatus prevents link members for monochrome and for color from coming off while suppressing an increase in rotatory torque and a deficiency of clutch capacity for transmitting a driving force to a cam shaft. Coming-off protection sections for preventing the coming off of a second link member which is the link member for color is provided in a cam section for monochrome. In other words, it is not necessary to provide a coming-off protection section in a second cam section which is a cam section for color requiring a large rotatory torque. This eliminates the need for a coming-off protection section of the cam section for color to act on the link member for color when a cam is turned by a driving source.

Transfer device of image forming device including monochromatic and full color transfer modes

A belt driving device includes an endless belt, a tension roller, a shaft member, deviation transfer members, and biasing members. The deviation transfer members are fitted over the shaft member in such a manner as to adjoin respective of opposite ends of the tension roller in an axial direction of the tension roller. Of the deviation transfer members, at least that deviation transfer member which is located on a downstream side in a deviation direction along the axial direction is movable together with the endless belt along the shaft member. Each of the biasing members has an acting end pivotally supported on an associated one of the deviation transfer members and a base end pivotally supported on an associated one of apparatus frames at a predetermined position.

Belt driving device

A printer with a printhead pressure adjusting mechanism including a thermal head, a platen drum, an adjusting mechanism, a detection device [e.g., switch(es)] and a control unit. The thermal head transfers ink of an ink ribbon onto recording paper by heat generation. The platen drum sandwiches the ink ribbon and the recording paper under pressure together with the thermal head. The adjusting mechanism adjusts the pressure being applied to the thermal head when pressing the thermal head. The detection device detects the size of the recording paper. The control unit controls the adjusting mechanism in order to adjust the pressure being applied to the thermal head in accordance with the detected size of the recording paper.

Growing community of inventors

Osaka, Japan

Shotaro Okamoto