FIXING DEVICE AND IMAGE FORMING APPARATUS

To provide a fixing device that achieves both prevention of wrinkles and reduction of curls during double-sided printing on plain paper, and prevention of wrinkles during printing on an envelope.SOLUTION: A fixing device has a fixing member (fixing roller 1) and a pressure member (pressure roller 2) that are in pressure contact with each other to form a nip part, and the fixing device has: a pressure plate (pressure arm 10) that rotates centered on a fulcrum 14 and applies pressure to the pressure member; an applied pressure adjustment device (cam 9) that adjusts the applied pressure of the pressure plate; an entry guide member (entrance guide 7) that guides a recording medium (sheet 5) entering the nip part; an ejection guide member (exit guide 8) that guides the recording medium ejected from the nip part; and transmission members (first support arm 12 and second support arm 13) that transmits displacement of the pressure plate to the entry guide member and the ejection guide member.SELECTED DRAWING: Figure 1 【課題】普通紙両面印刷時のしわ防止およびカール低減と、封筒印刷時のしわ防止とを両立させる定着装置を提供すること。【解決手段】定着装置は、定着部材（定着ローラ１）と加圧部材（加圧ローラ２）とが押圧当接してニップ部を形成する定着装置であって、支点１４を中心に回動し、加圧部材を加圧する加圧板（加圧アーム１０）と、加圧板の加圧力を調整する加圧力調整装置（カム９）と、ニップ部へ進入する記録媒体（用紙５）を案内する進入案内部材（入口ガイド７）と、ニップ部から排出された記録媒体を案内する排出案内部材（出口ガイド８）と、加圧板の変位を、進入案内部材と排出案内部材とに伝達する伝達部材（第一の支持アーム１２および第二の支持アーム１３）と、を有する【選択図】図１