ROTARY SHEET-FED PRINTING PRESS FOR
RECTO AND VERSO PRINTING HAVING AN
IMPRESSION CYLINDER DOUBLE THE
DIAMETER OF A BLANKET CYLINDER
AND SERVING AS A STORAGE DRUM
 Inventors: Karl-Heinz Helmstaedter, Sinsheim;
Nikolaus Spiegel, Walldorf, both of
 Assignee: Heidelberger Druckmaschinen AG,
 Appl. No.: 328,072
 Filed: Oct. 24,1994
 Foreign Application Priority Data
Oct. 22, 1993 [DE] Germany 43 36 047.5
 Int. CI.6 B41F 5/02
 U.S. CI 101/230; 101/409; 271/276;
 Field of Search 101/229, 230,
101/231, 231, 216, 409, 410; 271/112, 260, 276, 277
 References Cited
U.S. PATENT DOCUMENTS 2,395,444 2/1946 Belluche .
3,986,455 10/1976 Jeschke 101/409
3,992,993 11/1976 Kuhn et al. .
4,127,265 11/1978 Wirz et al 271/260
4,930,414 6/1990 Wirz 101/230
5,063,843 11/1991 Becker 101/230
5,186,107 2/1993 Wieland 271/276
FOREIGN PATENT DOCUMENTS
0452721 10/1991 European Pat. Off. .
0527424 2/1993 European Pat. Off. .
3-12517 3/1991 Japan .
1467602 3/1977 United Kingdom.
Primary Examiner—Eugene H. Eickholt
Attorney, Agent, or Firm—Herbert L. Lerner; Laurence A.
A rotary sheet-fed printing press for recto and verso printing has a turning drum disposed between impression cylinders having double the diameter of a conventional blanket cylinder, wherein a sheet gripped at a leading edge thereof by grippers of a first one of the impression cylinders is gripped at a trailing edge thereof by grippers of the turning drum upon transfer of the sheet to the turning drum. In the turning drum, suction nozzles are provided which suck the sheet, guided on the one impression cylinder, towards the turning drum in the vicinity of the trailing edge of the sheet and, in so doing, smooth it diagonally and peripherally on the circumference of the one impression cylinder, before the grippers of the turning drum which grip the sheet by the trailing edge thereof are closed, and the grippers of the one impression cylinder which grip the sheet by the leading edge thereof are opened.