Abstract: A drum for an electrophotographic copier with the drum serving as an image support and being connected to a rotary drive of the copier, the drum including a stock roll for accommodating a supply of a photosensitive weblike semiconductor material and an empty or takeup roll for receiving the weblike semiconductor material. The semiconductor material is guided over the outer peripheral surface of the drum from the stock roll and is taken up by the empty roll by means of a preferably stepwise adjustable drive. The drum including the stock roll, takeup roll, and semiconductor material form an exchangeable unit adapted to be inserted as a whole into the electrophotographic copier. The drum includes a slit defined by two deflector rolls from which slit the semiconductor material is adapted to be led into and out of the interior of the drum.

Abstract: A copying apparatus with a paper roll wound on a sleeve, a pair of roll holders having lugs frictionally held in the ends of the sleeve, each roll holder being provided with a journal pin adapted to engage an associated guide mounted on the copying apparatus.

Abstract: A detachably engaged unit associated with a copying machine wherein the unit includes a conveying arrangement for transferring a sheet or web of paper containing a charge relief image thereon to a station or position where a magnetizable powder is transferred to the charged surface of the web or sheet with a pressing arrangement being spaced rearwardly from the powder transfer station for fixing the image on the web or sheet under a pressure. The unit is supported on a pivot axis lying in the zone of a bottom edge of a housing on the copying machine whereby the unit can be pivoted from the copier housing in a conveying direction of the sheet or web thereby facilitating the repair, replacement, and/or service of the elements forming the detachably engaged unit.