Corrugated tubing perforating machine

A machine for perforating corrugated tubing at accurately spaced locations, comprising:

• a frame structure,
• means for advancing the tubing along a predetermined path in intermittent steps of equal length,
• releasable clamping means mounted on the frame structure and operable to clamp the tubing in a stationary position relative thereto,
• the clamping means comprising a plurality of clamping members each movable between clamping and release positions and each having a clamping face matched to the corrugations of the tubing for locating the tubing positively in the stationary position,
• a plurality of cutters mounted on the frame structure, each cutter being operable to move through a cutting stroke lying in a plane which is transverse to said path and intersects a valley between adjacent corrugations of the tubing when the tubing is clamped in said stationary position,
• means responsive to completion of a step of said advancing means for initiating movement of the clamping members into the clamping position,
• means operable in accordance with movement of the clamping members into the clamping position for initiating movement of the cutters through a cutting stroke,
• means responsive to completion of a cutting stroke for initiating release of said clamping means, and
• means responsive to return of the clamping members to the release positions for initiating a subsequent step of said intermittent advancing means.