| 摘要 |
A side lay assembly for lateral registration of sheets fed periodically along the surface of the feed table of a printing press. A sucker having a sucking surface flush with the feed table is slidably mounted on a sucker tube for movement toward and away from the table side guide. A side lay drive shaft, coupled to the press drive, is spaced below the sucker and parallel with the tube. A cam on the shaft engaging a cam follower on the sucker causes the sucker to move toward the side guide timed with the arrival of a sheet. An air valve is provided in the form of a valve disc close coupled to the cam for connecting the sucker tube to a source of suction in phase with lateral movement of the sucker so that the arriving sheet is urged into engagement with the side guide. To vary the degree of suction an adjustable bleed valve is interposed between the air valve and the source of suction. The sucker is of composite construction having a hollow body and a head, the head being removable from the body for replacement by a head having a different surface or set of apertures. |
