Abstract: A tool assembly includes first and second means which define between them a work station at which they periodically engage and release a moving web of material to perform a work operation, such as die cutting, on the web. A reciprocating shuttle has a pair of guide rollers on it which respectively engage the web before and after the tool means to alternately increase and decrease the work station velocity of the web by alternately decreasing and increasing the web path distance between the shuttle and the work station. The frequency of tool means movement is adjustable to adjust the repeat between work operations on the web. The shuttle means are synchronized with the tool means so that the work station web velocity at the time the tool means contact the web is substantially equal to the tangential velocity of the tool means.

Abstract: An adjustable eccentric assembly is mounted on a rotatable shaft and includes a first or drive collar having an arbor extending along the shaft and a second or guide collar mounted at the end of the arbor spaced from the drive collar. The drive collars have respective guide surfaces extending parallel to the axis of rotation of the shaft and a guide track is formed in the guide collar guide surface extending perpendicularly of the axis of rotation. A hub member is supported between the guide and drive collars and engages the guide track. Adjusting means serve to shift the hub member radially relative to the rotatable shaft to adjust the eccentricity of its rotation about the shaft. A throw member having a projecting link may be rotatably mounted on the hub member so that the eccentric rotation of the hub member imparts a reciprocating motion to the throw link.