FIXING DEVICE AND IMAGE FORMING APPARATUS

• Main Author: MAMIYA YUSUKE
• Format: Patent
• Language: English; Japanese
• Published: 29.03.2018
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To reduce the size of a fixing device that fixes a toner image to a recording medium by driving to rotate a fixing belt at a nip part at which the heated fixing belt is brought into pressure contact with a pressure member rotated by a nip forming member attached to a support member.SOLUTION: A fixing device 30 fixes a toner image t to a recording medium S at a nip part at which a fixing belt 33 wound around a heating roller 31 and a nip forming member 32 is brought into pressure contact with a pressure roller 34 driven to rotate. A support member 35 to which the nip forming member is attached has an attachment surface 35a, and an upstream-side extension part 35b and a downstream-side extension part 35c are extended from the upstream side and downstream side of the attachment surface toward the heating roller and are provided with notches 35b1 and 35c1 at both ends. The support member is attached to a support member attachment part 303 provided on a side plate 300 of the fixing device while the lengths of the upstream-side and downstream-side extension parts extended toward the heating roller are reduced.SELECTED DRAWING: Figure 4 【課題】 加熱された定着ベルトを支持部材に取り付けられたニップ形成部材により回転する加圧部材に圧接させたニップ部において、定着ベルトを回転駆動させて、トナー画像を記録媒体に定着させる定着装置を小型化させる。【解決手段】 加熱ローラー31とニップ形成部材32とに巻き掛けた定着ベルト33を、回転駆動される加圧ローラー34に圧接させたニップ部においてトナー画像tを記録媒体Sに定着させる定着装置30において、ニップ形成部材が取り付けられる支持部材35の取付面35aの上流側と下流側とから加熱ローラーに向けて延出された上流側延出部35b及び下流側延出部35cの両端部に切欠き35b1,35c1を設け、加熱ローラーに向け延出される長さを短くした状態で、定着装置の側板300に設けた支持部材取付部303に取り付けた。【選択図】 図４