Konica Minolta Business Technologies, Inc.

Tetsuko Kurosu

Naohiko Hanyu

Hiroshi Matsumoto

Hideaki Tanaka

Hisayoshi Nagase

Atsushi Takahashi

Yoshihito Sasamoto

Akifumi Isobe

Makoto Fujii

Masami Maruko

Hidetoshi Katayanagi

Kiyoaki Kawamoto

Satoshi Hamaya

Miho Toyoda

Provided is an image forming apparatus having a fixing device for fixing an image at a nip portion formed of two rotary members which rotate while facing each other, wherein occurrence of uneven print gloss is prevented. The image forming apparatus having a fixing device for fixing an image at a nip portion formed of two rotary members which rotate while facing each other, wherein one of the two rotary members is a belt which rotates while being stretched around of a plurality of rollers, a roller arranged at the exit of the nip portion out of the plurality of rollers has a crown shape, and a slack absorbing member for absorbing a slack of both ends of the belt caused by the crown-shaped roller is in contact with the belt.

Fixing device and image forming apparatus

Provided is an image forming apparatus comprising a secondary transfer belt disposed at a position to face an intermediate transfer belt across the transfer passage of paper (P), a fixing belt disposed on the down-stream side of the secondary transfer belt in the transfer direction of the paper (P) and at a position to face a rotary fixing member across the transfer passage of the paper (P), a photo sensor for detecting the widthwise position of the fixing belt, a steering roller angle changing unit for making the rolling angle of a steering roller changeable, and a first control unit for controlling a stepping motor on the basis of the signal of the photo sensor. The control unit does not perform the angle change of the steering roller, if the paper is constricted by both a transfer nip and a fixing nip.

Image forming apparatus to control belt position

An image forming apparatus is provided with a fixing section, including a heating member, a pressing member, in which the heating member and the pressing member are arranged to form a nipping section therebetween, and a belt member inserted through the nipping section for fixing a toner image on a recordig sheet by conveying the recording sheet through the nipping section; and a control section for controlling the fixing section and obtaining recording sheet information with respect to at least one of a plurality of conditions. The pressig member includes a plurality of pressing heads differing in shape and with respect to at least one of a plurality of characteristics, and the control section selects one of the plurality of pressing heads in accordance with the recording sheet information and controls the fixing section to press the recording sheet through the belt member with the selected one of the plurality of pressing heads.

Image forming apparatus with a fixing device employing a plurality of pressing members

An induction heating type of fixing device to fix a recording material having a toner image thereon, having a heating member, an induction coil divided into a plurality of parts, a temperature detector for detecting a temperature of the heating member, a signal generator for generating a switching signal that periodically controls permission and prohibition of energization of each of the divided induction coils, and a controller for controlling supply of a driving current to each of the divided induction coils to heat the heating member. The controller controls the energization by periodically switching the driving current to each of the divided induction coils on the basis of an energization signal that determines the permission and the inhibition of the driving currents according to a signal of temperature detected by the temperature detector, and the switching signal.

Induction heating type of fixing device and image forming apparatus equipped therewith

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Hino, Japan

Tetsuko Kurosu