| 发明名称 | Fixing device and image forming device | ||
| 摘要 | According to an embodiment, provided is a fixing device that includes: a rotatable fixing member that heats a recording medium on a side carrying an unfixed image; a rotatable pressing member that is pressed and is contacted with the fixing member to form a nip portion between the pressing member and the fixing member; a heat source heating the fixing member; a relay switch provided in an energizing path for the heat source; a temperature detection sensor detecting a temperature of the fixing member; and a control unit that controls energization of the heat source according to the temperature detected by the temperature detection sensor. The control unit keeps the relay switch in an off state if the temperature of the fixing member is equal to or more than a predetermined temperature when the fixing member has stopped rotation. | ||
| 申请公布号 | US9031439(B2) | 申请公布日期 | 2015.05.12 |
| 申请号 | US201313754305 | 申请日期 | 2013.01.30 |
| 申请人 | Ricoh Company, Limited | 发明人 | Hase Takamasa;Ishii Kenji;Ogawa Tadashi;Kawata Teppei;Yoshiura Arinobu;Shimokawa Toshihiko;Yamaji Kensuke;Uchitani Takeshi;Yuasa Shuutaroh;Yoshikawa Masaaki;Yoshinaga Hiroshi;Takagi Hiromasa;Iwaya Naoki;Imada Takahiro;Gotoh Hajime;Seshita Takuya;Yamashina Ryota;Ishigaya Yasunori |
| 分类号 | G03G15/20;G03G15/00 | 主分类号 | G03G15/20 |
| 代理机构 | Oblon, McClelland, Maier & Neustadt, L.L.P. | 代理人 | Oblon, McClelland, Maier & Neustadt, L.L.P. |
| 主权项 | 1. A fixing device comprising: a rotatable fixing member that heats a recording medium on a side carrying an unfixed image; a rotatable pressing member that is pressed and is contacted with the fixing member to form a nip portion between the pressing member and the fixing member; a heat source heating the fixing member; a relay switch provided in an energizing path from a power supplying unit to the heat source; a temperature detection sensor detecting a temperature of the fixing member; and a control unit that controls energization of the heat source according to the temperature detected by the temperature detection sensor, wherein the control unit includes an overheat protection circuit that outputs an abnormal stop signal to stop power supply to the heat source upon the temperature detection sensor detecting an excessive rise in the temperature of the fixing member, and a relay control unit that keeps the relay switch in an off state in which the relay switch is open for a period of time, on condition that the temperature of the fixing member is equal to or more than a predetermined temperature when the fixing member has stopped rotation, and wherein the overheat protection circuit is prevented from outputting the abnormal stop signal to stop power supply to the heat source during said period of time when the relay switch is open. | ||
| 地址 | Tokyo JP | ||