Apparatus for adjusting the position of a rotatable cutter mechanism

Abstract

A shaft for a cutter mechanism having a cutter blade secured to the periphery thereof is rotatably mounted in a frame mechanism. A driven pulley is nonrotatably secured to the end of the cutter shaft and is connected to a pair of drive pulleys by a flexible timing belt that transmits rotation to the cutter shaft and the cutter blade. Rotation of the cutter blade cuts notches in the side edges of a moving web. A plate member is pivotally connected to the frame mechanism and includes an aperture through which the cutter shaft extends. An adjusting cam is eccentrically mounted to the frame mechanism and is secured to the plate member. A pair of idler shafts are secured to the plate member and extend outwardly therefrom. A pair of idler pulleys are rotatably positioned on the idler shafts respectively and engage the timing belt to maintain a preselected tension thereon. Rotation of the adjusting cam through a preselected angle pivots the plate member and the idler pulleys through a corresponding angle on the frame mechanism relative to the cutter shaft. Pivotal movement of the idler pulleys turns the timing belt to rotate the driven pulley and cutter shaft in preselected direction through a preselected angle. Rotation of the cutter shaft rotates the cutter blade to provide a change in the phase relationship between the cutter blade and the moving web to be cut while the cutter mechanism is operating or static.