| 摘要 |
A pressure lever (49) journaling a pressure roller (44) is rockably connected to a fixation frame (48) journaling a fixing roller (41) A pivotal position of the pressure lever (49) is adjusted by a motor (61) through driving gears (59), sector gears (58), press-contact adjusting levers (51), and press contact springs (57), so that a mode of a fixing press contact force is set to a heavy press contact mode or a light press contact mode. By a control section (14), at start-up immediately after power-on and on basis of a temperature and a humidity detected by a temperature and humidity sensor (67), the heavy press contact mode is established for rectifying poor curl conditions of paper sheets on condition that the present temperature and humidity environment is a high-temperature high-humidity environment or the light press contact mode is established for rectifying poor fixation performance on condition that the present temperature and humidity environment is a low-temperature low-humidity environment. Thus, satisfactory fixation performance and satisfactory curl conditions of paper sheets are expected to go together. |
