Fixing device of an electrostatic copying apparatus.

摘要

A fixing device for fixing a toner image on the surface of a sheet material comprising a rotatably mounted driven fixing roller (474) drivingly connected to a drive source (308) and a rotatably mounted follower fixing roller (476). At least one end of the follower fixing roller (476) is mounted on a movable supporting member (518) mounted for free movement between a press-contacting position at which the follower fixing roller (476) is maintained in press-contact with the driven fixing roller (474) and an isolated position at which at least a greater portion of the follower fixing roller (476) in its longitudinal direction is isolated from, or maintained out of press-contact with, the driven fixing roller (474). Furthermore, a press-contacting control mechanism is provided which moves the movable supporting member (518) to the press-contacting position upon energization of the drive source (308) and to the isolated position upon deenergization of the drive source (308).