| 摘要 |
An apparatus for perforating corrugated tubing includes at least one pair of feeder-cutter wheels, each feeder-cutter wheel including a worm a helical threading disposed at an angle on the worm for intersecting corrugations of corrugated tubing, and a cutter disposed on the worm in line with the threading, a drive shaft for each feeder-cutter wheel, each of the drive shafts including a front end portion having a longitudinal axis, one of the feeder-cutter wheels being coaxially mounted to a front end portion of each of the drive shafts for rotation thereby; and an assembly for moving each feeder-cutter wheel in a direction which is substantially transverse to the longitudinal axis of its associated drive shaft front end portion. In a preferred apparatus, the wheel moving assembly is operable to move the feeder-cutter wheels from a first position, in which the wheels are spaced to make contact with the tubing, to a second position, in which the wheels are spaced to allow the tubing to pass therebetween without substantial contact therewith. The present invention also includes a method of perforating corrugated tubing,which includes the steps of feeding a piece of corrugated tubing into a tubing perforation machine, the machine having a plurality of feeder-cutter wheels thereon, each feeder-cutter wheel including a worm, a helical threading disposed at an angle on the worm, and a cutter disposed on the worm in line with the threading; moving the tubing through the machine by rotating the feeder-cutter wheels, the helical threadings riding in corrugations of the tubing to advance the tubing as the wheels are rotated, the cutters intermittently intersecting the tubing to cut perforations therethrough as they rotate around the wheels, the tubing traveling along a longitudinal axis therof; and moving each feeder-cutter wheel outwardly away from the tubing, in a direction which is substantially transverse to the longitudinal axis of the tubing to temporarily disable the cutters.
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