Device for adjustment of oscillation amplitude on zigzag folding apparatus

Claim 1

In a folding apparatus for printing machines including reciprocating guide channel devices for delivering a web of paper or other material downwardly from a web conveyor device in zigzag folds, driving means for each guide channel device being provided at opposite side edges of the web, said driving means including rotatable cams supporting each said guide channel device for reciprocating same upon rotation of the cams, each cam being mounted on a drive shaft, gear means operatively interconnecting the drive shafts to effect synchronous rotation of the cams; drive means in operative engagement with at least one of said drive shafts; means connected with said guide channel devices for quickly and positively adjusting the oscillation amplitude thereof, each of said cams having an elongated opening extending therethrough, fastening means extending through said openings for mounting said cams to their respective drive shafts, a surface of each said cam adjoining a surface of its respective shaft when mounted thereto, the adjoining surfaces between said respective cams and said drive shafts being roughened, said surface of each of said drive shafts being provided with a groove extending parallel to said elongated openings, and each of said cams having nose portions extending into respective ones of said grooves, whereby each said cam may be shifted by actuation of said adjustment means with respect to its respective drive shaft upon a loosening of said fastening means and, upon tightening said fastening means, said roughened surfaces serve to positively maintain the adjusted position of said drive channel devices.