Slot cutting machine for continuously advancing strip material

Claim 1

A SLOT CUTTING DEVICE FOR USE WITH CONTINUOUSLY ADVANCING STRIP MATERIAL, COMPRISING: (A) JUXTAPOSITIONED PUNCH AND BACK-UP MEMBERS (1) EACH HAVING ENDLESS PERIPHERAL EDGES THAT ARE ARRANGED FOR MOVEMENT AROUND PARALLEL AXES AND THROUGH CLOSED CYCLIC PATHS OF MOVEMENT THAT RESPECTIVELY INCLUDE INCREMENTS OF MOVEMENT THAT ARE SUBSTANTIALLY ADJACENT THE OPPOSED SURFACES OF SAID STRIP (A) WHEREBY SAID STRIP MAY PASS BETWEEN SAID PUNCH AND BACK-UP MEMBERS IN SUBSTANTIAL TANGENCY THEREWITH; (B) A SLUG RECEIVING CAVITY OPENING RADIALLY INWARDLY FROM THE PERIPHERAL EDGE OF SAID BACK-UP MEMBER; (C) AT LEAST ONE PUNCH ELEMENT (1) CARRIED BY SAID PUNCH MEMBER FOR MOVEMENT THEREWITH AND (2) PROJECTING BEYOND THE PERIPHERAL EDGE OF SAID PUNCH MEMBER TO AN EXTENT SUBSTANTIALLY EQUAL TO THE THICKNESS OF SAID STRIP AND (3) BEING ALIGNED WITH SAID SLUG RECEIVING CAVITY AND (4) HAVING A PUNCHING PORTION ON ITS PROJECTING END (A) SAID PUNCHING PORTION HAVING A FIRST SURFACE DISPOSED OUT OF PERPENDICULAR RELATIONSHIP WITH THE LONGITUDINAL EXTENT OF SAID PUNCH ELEMENT; (B) SAID PUNCHING PORTION HAVING A SECOND SURFACE DISPOSED OUT OF PERPENDICULAR RELATIONSHIP WITH THE LONGITUDINAL EXTENT OF SAID BODY AND IN ANGULAR RELATIONSHIP WITH SAID FIRST SURFACE; (C) AND FURTHER HAVING A CHAMFERED PORTION INTERCONNECTING SAID FIRST AND SECOND SURFACES; (D) SAID FIRST SURFACE BEING DISPOSED IN SUBSTANTIALLY PARALLEL RELATIONSHIP TO A PLANE EXTENDING NORMALLY TO THE PERIPHERY OF SAID BACK-UP MEMBER AT THE POINT OF CONTACT OF SAID PUNCH ELEMENT AND SAID STRIP MATERIAL.