Abstract: An electrographic multi-color copier capable of color correcting electrographic images formed on discrete dielectric sheets, and including improved apparatus for transporting and accurately registering selected ones of such sheets relative to others during color correction. Selected dielectric sheets are respectively transported at a predetermined linear speed along first and second travel paths associated with the color correction apparatus. A first registration mechanism is selectively movable to a position intercepting the first travel path upstream of such color correction apparatus for registering the sheet relative to such apparatus, and a position remote from such path. A second registration mechanism is selectively movable to a position intercepting the second travel path upstream of such color correction apparatus for registering such other sheet relative to such apparatus, and a position remote from such path.

Abstract: Apparatus for producing images on first and second sides of a copy sheet. Unfixed transferable images formed on an image transfer member are transferred to the opposite sides of a copy sheet brought into transferable relationship with the image transfer member. A copy sheet handling apparatus includes a vacuum member movable in opposite directions. The vacuum member is moved between first and second positions spaced from one another. At the first position, the vacuum member overlies the transfer member and is moved in one direction in synchronism therewith to separate a copy sheet to one side of which a first transferable image has been transferred. At the second position, the vacuum member is aligned with the transfer member and is moved in an opposite direction to bring the second side thereof into transferable relationship with the second transferable image on the transfer member.

Abstract: Apparatus operable in duplex and simplex modes for making copies having images on one or both sides thereof. In the duplex mode, first and second transferable images are formed on a movable image transfer member by an image forming device, a copy sheet is supplied from a copy sheet supply into transfer relationship with the transfer member and the first image is transferred to a first side of a copy sheet at a first image transfer station. A vacuum drum located adjacent to the transfer member is rotated in a first direction to separate the copy sheet from the transfer member. After the copy sheet has been separated, the drum is rotated in a second opposite direction to invert the copy sheet while the first image is unfixed and to register the second side with the second transferable image on the transfer member at a second image transfer station.

Abstract: An apparatus for producing duplex copies. First and second unfixed images are transferred to opposite sides of a copy sheet before fixing of either image to the copy sheet. The first and second unfixed images may be electroscopic images sequentially formed on a photoconductor by electrophotographic techniques. The first unfixed electroscopic image is transferred from the photoconductor to a first side of a copy sheet, the sheet is inverted while the first image thereon remains unfixed, the second unfixed electroscopic image is transferred to the second side of the copy sheet, the copy sheet with the first and second unfixed images thereon is then transported to a fixing station.

Abstract: Apparatus for producing duplex or simplex collated copies from duplex and simplex originals comprising a copier having a duplexing section with two transfer stations separated by a copy-sheet inverter. A document feeding section circulates and recirculates original sheets, one-after-another, for producing sets of copies in page-sequential order. The document feeder is provided with a single hopper for receiving and maintaining the originals in their usual page sequence or order so that no preparation (i.e., special arrangement) of an original is necessary prior or subsequent to copying for making collated copies. The duplexing section requires only a single fuser that is positioned so that the copy sheets pass through both transfer stations before entering the fuser, thus permitting transfer of images under similar conditions in both transfer stations.

Abstract: Method and apparatus for producing duplex copies. First and second unfixed images are transferred to opposite sides of a copy sheet before fixing of either image to the copy sheet. The first and second unfixed images may be electroscopic images sequentially formed on a photoconductor by electrophotographic techniques. The first unfixed electroscopic image is transferred from the photoconductor to a first side of a copy sheet, the sheet is inverted while the first image thereon remains unfixed, the second unfixed electroscopic image is transferred to the second side of the copy sheet, the copy sheet with the first and second unfixed images thereon is then transported to a fixing station.