DEVICE FOR FLATTENING SINGLE SHEETS IN NON-MECHANICAL PRINTERS AND PHOTOCOPY MACHINES

摘要

PCT No. PCT/DE88/00373 Sec. 371 Date Nov. 26, 1990 Sec. 102(e) Date Nov. 26, 1990 PCT Filed Jun. 22, 1988 PCT Pub. No. WO89/08872 PCT Pub. Date Sep. 21, 1989.In a single-sheet page printer for both-sided printing of recording media, a flattening device is provided for flattening the curled recording media resulting from pressure and temperature influences in the print fixing station of the printer. The flattening device deforms the recording media in the plastic domain so that the recording media are again lent a smooth and flat form. To this end, the recording medium is pulled over an edge by paper conveyor rollers opposite a pressing power exerted by spring elements and is thereby pulled taut and aligned. When the flattening device is arranged immediately following the fixing station, then it is proposed that the pressure roller be set back in the direction of the recording medium delivery relative to the position of the fixing drum. The geometrical design of a paper guide channel that immediately follows the fixing nip of the fixing means is such that the recording medium is thereby first curved in one direction and is subsequently curved in the opposite direction, so that a smooth and flat recording medium is ejected from the paper guide channel. Recording media of the greatest variety of paper qualities having different weights is flattened by the flattening device.