Abstract: A roller fuser including a driven roller and an idler roller which form a nip to fuse toner images to copy sheets. The idler roller is moved into and out of engagement with the driven roller by an expandable bladder which is inflated with a pressurized gaseous medium. A copy sheet detector is positioned very close to the nip exit of the rollers. In case of a copy sheet jam in the roller nip, the detector provides a jam detection signal which effects rapid exhaustion of gaseous medium from the bladder to disengage the rollers and prevent further driving of a copy sheet into the roller nip.

Abstract: Apparatus for producing duplex copies including an image transfer member movable at a first velocity and having first and second unfixed transferable images; and image transfer apparatus for transferring the first and second images to the first and second sides respectively of a copy sheet. A copy sheet turnover member is also provided adjacent to the image transfer member. The turnover member is movable in a first direction to separate a copy sheet to the first side of which the first image has been transferred. The turnover member is then movable in a second opposite direction to turnover the copy sheet while the first image is unfixed and to register the second side of the copy sheet with the second image on the image transfer member at the image transfer apparatus.