Fujitsu Corporation

Hidefumi Tasaki

Hiroshi Kobayashi

Tomoyuki Nagamine

Katsumi Takada

Hiroyuki Okitsu

A fixing device comprises an upper heat roller and a lower heat roller which, by contact rotations of their roller surfaces, thermally fix images on cut sheets passing therebetween. The fixing device further comprises a single oil roller which supplies oil for cut sheet release to the upper and lower heat rollers. When conveying to a process unit a cut sheet B to be back-side printed which has been delivered via a circulation path, a conveyance control unit forms a conveyance spacing L from a precedent cut sheet A which spacing conforms to one turn or more of the lower heat roller, so as to ensure uniform application of oil from the upper heat roller to the lower heat roller during the cut sheet vacant interval.

Image forming apparatus and cut sheet conveyance control method

Disclosed is a liquid detection device wherein a condition in which there is no liquid remaining in either a storage member or a tank and a condition in which there is liquid remaining in at least either the storage member or the tank are easily discriminated using a single mechanism. When there is oil (liquid) remaining in at least either the oil tank or the impregnated member (storage member), light emitted from a light emitting part is passed into the oil through a prism face located partway along the light path, and does not reach a light receiving part. On the other hand, when there is no oil remaining in either the oil tank or the impregnated member, the emitted light reaches the light receiving part. When the oil tank itself is not mounted, the light emitted from the light emitting part also reaches the light receiving part. When the light emitted from the light emitting part is not detected by the light receiving part, a controller determines that there is oil.

Growing community of inventors

Kawasaki, Japan

Hidefumi Tasaki