Image forming device

Abstract

Abstract Translated from Japanese (57)【要約】 【課題】 定着加熱ローラの芯金を薄くして省エネルギ 化した定着装置を有する画像形成装置において、コピー 終了時にかなり大きな温度上昇が見られて異常警告がで てしまう現象が、ヒータ回路の異常と混同されて検出さ れてしまい、画像形成装置を効率悪くしていたが、この ような各現象を弁別して真に異常な状態のみを検出して 排除する制御のできる制御手段を持つ画像形成装置を提 供する。 【解決手段】 定着加熱ローラの検知温度が所定閾値温 度を超えたら異常と判断し、該定着加熱ローラの加熱ヒ ータへの通電を遮断する定着装置を有する画像形成装置 において、定着加熱ローラの通常の制御温度Ｔｃよりも 高い所定温度Ｔ１からそれよりも高い所定温度Ｔ０に至 るまでの時間ｔ１によって異常と判断する閾値温度を変 更するように制御する制御手段を有する画像形成装置。 (57) [Problem] In an image forming apparatus having a fixing device in which the core of a fixing heating roller is thinned to save energy, a considerable temperature rise is observed at the end of copying, and an abnormal warning is issued. However, this is confused with the abnormality of the heater circuit and is detected, and the efficiency of the image forming apparatus is reduced. However, such control that can discriminate such phenomena and detect and eliminate only the truly abnormal state can be performed. An image forming apparatus having means is provided. SOLUTION: In an image forming apparatus having a fixing device which determines that an abnormality is detected when a detected temperature of a fixing heating roller exceeds a predetermined threshold temperature and interrupts energization to a heater of the fixing heating roller, a normal operation of the fixing heating roller is performed. An image forming apparatus having control means for controlling so as to change a threshold temperature for determining an abnormality based on a time t1 from a predetermined temperature T1 higher than the control temperature Tc to a predetermined temperature T0 higher than the control temperature Tc.

Inventors

• 👤 Naohiko Haniyu
• 👤 羽生　　直彦

Bibliographic Details