Slitting apparatus for corrugated paperboard and the like

摘要

An apparatus for providing longitudinal, laterally spaced slits in a continuously moving sheet or web of corrugated paperboard or the like includes a plurality of upper tool heads each supporting a thin, circular rotary slitting blade. The blades are coaxially mounted and driven by a common drive shaft and each blade-carrying tool head is independently positionable across the width of the paperboard sheet. Each slitting assembly includes a lower tool head or counterhead carrying a roller assembly which supports the underside of the moving board and provides a firm surface to support the board against the upper rotary slitting blade. The roller assembly includes a circumferential radially extending slot in its outer surface through which an edge portion of the upper cutting blade travels with the sheet firmly supported by the roller surfaces on each side of the slot. A blade lubricator is attached to the upper head and applies a thin film of lubricant to the blade edge by direct engagement by a lubricating wick while the blade is rotating. The thin blade is maintained in a sharpened condition by periodic engagement with a rotary sharpening tool pivotally attached to the upper tool head for periodic light sharpening contact with one face of the beveled blade cutting edge.