for different arklengder instellbar overforingstrumma for tryckmaskiner

摘要

1455756 Transfer cylinders of printing presses HEIDELBERGER DRUCKMASCHINEN AG 22 Nov 1974 [22 Nov 1973] 50788/74 Heading B6C A transfer drum, D, of a printing press comprises a rotary shaft 1, a row of segments 2 fixed to shaft 1 and a row of segments 5 which are angularly adjustable with respect to the fixed segments. The outer surfaces of the segments support sheets 28 which are gripped at their leading and trailing edges by unitary gripper bars 4, 6. Thus, different sheet sizes can be accommodated by angular adjstment of the segment rows, e.g. to a small format, Fig. 2 (not shown). The segments 2, 5 of the rows are staggered to permit them to interact in a comblike fashion, Fig. 5. When the sheet format is such that the segments 2, 5 do not constitute a continuous support surface, bridging members 8, 8SP1/SP are arranged to span the gaps; these members 8, 8SP1/SP are pivoted about bearing pins 10 journalled in segment 2, and have camming surfaces 9 interacting with rollers 14 mounted on segments 5; springs 13 cause the members 8, 8SP1/SP to pivot inwards when not required, Fig. 2. In an alternative embodiment, Figs. 9 to 11 (not shown), the bridging members are arcuate straps (17), which are telescopically connected to grooves in the sheet-supporting segments.