IMAGE FORMING APPARATUS

摘要

An image forming apparatus includes a fixing unit, an apparatus main body, a nip pressure changing member, a driving source, and a clutch mechanism. The fixing unit includes a first rotating member, a second rotating member, and a fixing nip forming mechanism. The fixing nip forming mechanism forms a fixing nip between the first rotating member and second rotating member. To the apparatus main body, the fixing unit is detachably installed. The nip pressure changing member presses the fixing nip forming mechanism and to change a pressure of the fixing nip by rotating around a rotation axis. The driving source rotates the nip pressure changing member. The clutch mechanism permits a transmission of a rotation from the driving source to the nip pressure changing member and restricts a transmission of a rotation from the nip pressure changing member to the driving source.

主权项

1. An image forming apparatus comprising:
a fixing unit including a first rotating member heated by a heating source, a second rotating member facing the first rotating member, and a fixing nip forming mechanism forming a fixing nip between the first rotating member and second rotating member by bringing the second rotating member into pressure contact with the first rotating member; an apparatus main body to which the fixing unit is detachably installed; a nip pressure changing member configured to press the fixing nip forming mechanism and to change a pressure of the fixing nip by rotating around a rotation axis; a driving source that rotates the nip pressure changing member; and a clutch mechanism configured to permit a transmission of a rotation from the driving source to the nip pressure changing member and to restrict a transmission of a rotation from the nip pressure changing member to the driving source.