IMAGE FORMING APPARATUS

• Main Authors: TAKEUCHI KIMIO, HATAKEYAMA SHINICHI
• Format: Patent
• Language: English; Japanese
• Published: 05.04.2024
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide an image forming apparatus that can prevent the occurrence of printing stains on a sheet by reducing the amount of water to be adhered to the sheet.SOLUTION: An upper frame 64 of a fuser 6 has an upper first rib 641 extending in a sheet conveyance direction, an upper second rib 642 arranged adjacent to the upper first rib 641 in a width direction and extending along the sheet conveyance direction, and a roller 643 nipping a sheet S with a driving roller 66. The upper first rib 641 includes a first guide surface 641a capable of guiding a top face of the sheet S, and a separation surface 641b arranged on the downstream side in the sheet conveyance direction of the first guide surface 641a. The upper second rib 642 includes a second guide surface 642a capable of guiding the top face of the sheet S. In a direction orthogonal to the sheet conveyance direction and the width direction, the distance between the second guide surface 642a and a nip point NP2 formed by the roller 643 and the driving roller 66 is smaller than the distance between the separation surface 641b and the nip point NP2.SELECTED DRAWING: Figure 8 【課題】シートに付着する水分量を減少して、シートの印字汚れの発生を抑制できる画像形成装置を提供する。【解決手段】定着器６の上フレーム６４は、シート搬送方向に沿って延びる上第１リブ６４１と、上第１リブ６４１の幅方向に隣接して配置され、シート搬送方向に沿って延びる上第２リブ６４２と、駆動ローラ６６とともにシートＳをニップするコロ６４３とを有し、上第１リブ６４１は、シートＳの上面をガイド可能な第１ガイド面６４１ａと、第１ガイド面６４１ａよりもシート搬送方向の下流側に配置された離間面６４１ｂとを備え、上第２リブ６４２はシートＳの上面をガイド可能な第２ガイド面６４２ａを備え、シート搬送方向および幅方向と直交する方向において、コロ６４３と駆動ローラ６６とのニップ点ＮＰ２と２ガイド面６４２ａとの距離は、ニップ点ＮＰ２と離間面６４１ｂとの距離よりも小さい。【選択図】図８