Abstract: The corona paper charging unit includes unique corona wire support means affording a corona structure of simple construction while assuring proper corona wire tension and insulation.

Abstract: An improved microfiche reader-printer includes an electro-mechanical control mechanism, roll paper storage and feed mechanism, paper cutter and a corona paper charger unit in the upper portion of the machine. Disposed in the lower portion of the machine are a paper developer, dryer and discharge chute, a light source, microfiche carrier and an optical lens system. The optical system includes two moveably disposed mirrors selectively operable to project one selected fiche image either forwardly onto a viewing screen or rearwardly to an exposure station where a selected size paper is momentarily retained to permit exposure. The control mechanism functions to effect sequential operation of each of the machine elements whereby a selected fiche image is read and printed.