Abstract: An apparatus for transporting web-shaped recording media through an electrographic printer or copier has a support member which supports driving and guiding elements. The support is pivotally mounted in the housing via a support shaft. The recording medium is transported by friction by a drive roller mounted on the support, the recording medium being pressed against the toner carrier by a pressing member. The supporting shaft and the drive roller run in a coaxial manner.

Abstract: A transfer printing station is provided which has two pairs of tractor drives movably arranged side-by-side on two drive shafts. During operation with only a single paper web, the unused tractor drives can be moved to a lateral parking position. The two pairs of tractor drives can be easily moved to match two different webs of paper of different widths. The structure enables a user to adapt the paper conveyor of a transfer printing station to operate with only a single paper web or two parallel webs.

Abstract: In a printing station, pins for engaging edge perforations of the paper are mounted on a toothed belt. The paper is lifted from a position fully engaged on the pins to a tapered head portion of the pins higher up on the pins to avoid stress on the paper from the pins. Lifting of the paper is provided by a paper guide element.

Abstract: A printing station includes pins for engaging into edge perforations of continuous paper. The pins are mounted on a toothed belt at the gaps between the belt teeth. A two part pin mounting has a portion engaged between the teeth of the belt.

Abstract: In the cleaning station of an electrophotographic printer, the stripper element is driven with the assistance of a cable roller arranged outside of a stripping chamber. The cable roller arranged in alignment with the through openings for the traction cable comprises guide grooves for the traction cable on its generated surface, these guide grooves proceeding left-hand or right-hand in a plurality of spirals or turns. Via a thread, the cable roller is arranged on a stationary rotational axis which has the same characteristic as the guide grooves in terms of direction and pitch or slope. As a result thereof, the traction cable is conducted on a straight line through the seals of the stripping chamber at a constant angle given movement of the cable roller.

Abstract: A drive transmission gear unit is constructed to make possible adjustments in the relative spacial relationship between the unit gear wheels and a load shaft. The adjustment in the relative relationship between the unit and the load shaft may be carried out without varying the engagement relationships of the rotary elements within the unit. A centering arrangement is provided in the unit whereby the gear housing portion is rotatable about a driven shaft, thus enabling the gear unit to adjust for slack developing in any belt or chain tension means used to transmit rotary motion to a load shaft.

Abstract: A stacker assembly for a prefolded continous web of paper is provided with an air jet means for directing an air stream onto the upper sheet of the paper stack being piled in the stacker to press down the folded edges in the stack. The direction and intensity of the air stream are controlled by means of a directional control device and an intensity control device. These control devices have variable settings in order to properly accommodate the particular form lengths of the paper being folded and the particular rigidity characteristics and weight of the paper. The two control devices may be connected via a mechanical coupling device so as to permit automatic adjustment in accordance with lateral displacement of form length guide walls positioned on opposed sides of the paper stack, these guide walls being displaced to accommodate prefolded web paper having different form lengths.

Abstract: A stacking device for a prefolded endless paper-web in a paper stacker, in which the paper-web is stacked on a paper support which is designed to move downward in accordance with the stack height, a compensating element being provided which moves downward with the paper support and is adapted to elevate the central portion of the stack, with respect to the folded edges thereof, to reduce the formation of a depression in such central portion resulting from the transversely folded edge portions, means being provided for varying the elevation height of the compensating element as a function of the stack height.