Abstract: A system for providing duplex images on copy sheets wherein the images are formed on the copy sheets by delivering the sheets to an impression cylinder for transfer of the images to the sheets. First and second ink images are provided, and each sheet is fed to the impression cylinder in synchronism with a first image for transfer of the first image to one side of each sheet. Each sheet is then removed to a staging area which includes a conveyor mechanism for re-feeding the sheet to the impression cylinder, trailing edge first. The re-feeding is in synchronism with the movement of the second image whereby this second image is transferred to the opposite side of each sheet. The impression cylinder is provided with a first gripper for engaging the leading edge of each sheet and with a second gripper for engaging the trailing edge of each sheet. The staging area comprises a plurality of conveyor belts and a chamber with air exhaust means beneath the belts.

Abstract: A mechanism for driving a computer form web along a predetermined path includes a ratchet wheel having two sets of oppositely facing teeth, mounted on a support shaft for rotation. The wheel is driven in both clockwise and counter-clockwise directions. A drive gear in meshing engagement with a plurality of gears for driving the sprocket mechanism transporting the computer form web is also mounted on the support shaft for rotation. The gear is joined to a coupling plate also mounted on the support shaft for rotation thereon. The coupling plate includes first and second pawls which extend therefrom for cooperative engagement with the ratchet teeth sets, respectively. Pawl actuator arms also mounted on the coupling plate are movable to first and second positions and when in a first position engage the pawls to maintain the latter out of engagement with respective ratchet teeth sets. Pawl actuator arm engaging levers are mounted adjacent the pawl actuator arms and are movable to first and second positions.

Abstract: A guide chute arrangement for an apparatus used to feed a computer form printout web to the original document platen of a copying machine which includes a pivotally mounted copyboard overlying the platen over and about which the web is fed, includes an upper chute assembly for guiding the web between the upper surface of the copyboard and a first supply tray and a lower chute assembly for guiding the web between the lower surface of the copyboard and a second supply tray. Each of the chute assemblies includes complementarily, predeterminedly shaped upper and lower walls forming channels therebetween. The lower walls of the chute assemblies are fixedly mounted. The upper wall of the upper chute assembly is mounted for pivotal movement on extension arms which permit the movement of the upper wall away from the lower wall for easy threading of the web thereinto.