FIXATION DEVICE AND IMAGE FORMING APPARATUS

• Main Authors: GOTO SO, YOSHINAGA HIROSHI, HASE TAKAMASA, UCHITANI TAKESHI, ISHII KENJI, TAKAGI HIROTADA, SATO MASAHIKO, YOSHIURA ARINOBU, SUZUKI AKIRA, YOSHIKAWA MASAAKI, OGAWA SADAFUMI, KAWADA TEPPEI, SESHIMO TAKUYA, IMADA TAKAHIRO, YUASA SHUTARO, YAMAJI KENSUKE, IWATANI NAOKI, SHIMOKAWA TOSHIHIKO
• Format: Patent
• Language: English; Japanese
• Published: 23.02.2017
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To provide a fixation device capable of improving strength of a supporting member for supporting a nip formation member so as to prevent bending of the nip formation member.SOLUTION: A fixation device 20 includes: a rotatable endless fixation belt 21; a nip formation member 24 arranged inside the fixation belt 21; a counter rotary body 22 coming into contact with the nip formation member 24 via the fixation belt 21 to form a nip part N between the fixation belt 21 and itself; a heat source 23 for directly heating the fixation belt 21 at a location other than the nip part N; and a supporting member 25 for supporting the nip formation member 24. In the fixation device, a recording medium P carrying an unfixed image is conveyed to the nip part N between the rotating fixation belt 21 and the counter rotary body 22 to fix the unfixed image to the recording medium P. The supporting member 25 has a rising portion 25b which extends in a contact direction of the counter rotary body 22 with respect to the fixation belt 21 and whose tip is proximate to an inner peripheral face of the fixation belt, and is regulated to have a section modulus of a specified value (200 mm3 or larger).SELECTED DRAWING: Figure 6 【課題】ニップ形成部材を支持する支持部材の強度を向上させ、ニップ形成部材の撓みを防止することができる構成を備えた定着装置を提供する。【解決手段】回転可能な無端状の定着ベルト２１と、定着ベルト２１の内側に配設されたニップ形成部材２４と、定着ベルト２１を介してニップ形成部材２４と当接することにより定着ベルト２１との間にニップ部Nを形成する対向回転体２２と、ニップ部N以外の箇所で定着ベルト２１を直接加熱する加熱源２３と、ニップ形成部材２４を支持する支持部材２５とを備え、回転する定着ベルト２１と対向回転体２２との間のニップ部Nに、未定着画像を担持した記録媒体Pを搬送して、記録媒体Pに未定着画像を定着する定着装置２０において、支持部材２５は、定着ベルト２１に対する対向回転体２２の当接方向に延びてその先端が定着ベルトの内周面に近接する立ち上がり部２５ｂが設けられ、且つ断面係数を所定値（２００ｍｍ３以上）に規定したことを特徴とする。【選択図】図６