Method of forming electromagnetic cores

Claim 2

IN A METHOD OF FORMING A HELICALLY WOUND LAMINATED STRUCTURE THE STEPS WHICH INCLUDE: HELICALLY WINDING A STRIP EDGEWISE ABOUT A FIRST AXIS INTO A NUMBER OF SUCCESSIVE HELICAL TURNS EACH FORMED WITH A GENERALLY RECTANGULAR CROSS SECTION AT ANY GIVEN LOCATION ACROSS THE TURN AND WITH A NOTCHED EDGE AND AN UNINTERRUPTED EDGE WHEREBY THE UNINTERRUPTED EDGE SUBSTANTIALLY DEFINES A HELIX WHICH CIRCUMSCRIBES THE HELIX SUBSTANTIALLY DEFINED BY THE NOTCHED EDGE GUIDING AND ADVANCING THE INDIVIDUAL TURNS ONTO A ROTATING ARBOR HAVING AN AXIS SUBSTANTIALLY COAXIAL WITH THE FIRST AXIS, PIERCING HOLES IN THE INDIVIDUAL TURNS AT SPACED INTERVALS AS THE TURNS ROTATE WITH THE ARBOR, AND SEVERING A SINGLE TURN OF THE ROTATING TURNS AFTER A PREDETERMINED NUMBER OF TURNS HAVE BEEN PIERCED TO FORM A LAMINATED STACK.

Claim 3

IN A METHOD OF FORMING A HELICALLY WOUND LAMINATED CORE FROM A STRIP OF MAGNETIC MATERIAL HAVING A SUCCESSION OF OPENINGS THEREIN, THE STEPS WHICH COMPRISE: SUCCESSIVELY ENGAGING THE WALLS OF THE STRIP DEFINING THE OPENINGS AND DRIVING THE STRIP EDGEWISE THROUGH A CONFINED ARCUATE PATH, COMPRESSING THE STRIP AXIALLY AS IT PASSES THROUGH THE CONFINED ARCUATE PATH TO MAINTAIN THE THICKNESS OF THE STRIP SUBSTANTIALLY UNIFORM AND FORMING SUCCESSIVE HELICAL TURNS, ADVANCING THE TURNS FROM THE CONFINED ARCUATE PATH ONTO A ROTATING ARBOR, MOVING A PUNCHING TOOL ADJACNET A PREDETERMINED POINT ON THE RESPECTIVE SIDES OF AN INDIVIDUAL TURN AS IT IS ROTATABLY DRIVEN THROUGH A CURVED PATH BY THE ARBOR, PASSING THE PUNCHING TOOL AND THE INDIVIDUAL TURN CONCURRENTLY THROUGH SAID CURVED PATH AT THE SAME SPEED AND IN THE SAME DIRECTION WHILE PUNCHING THE TURN AT THE PREDTERMINED POINT BY OPERATION OF THE TOOL DURING SUCH CONCURRENT TRAVEL, AND MOVING THE TOOL AWAY FROM THE PREDETERMINED POINT AFTER THE TURN HAS BEEN PUNCHED.

Claim 4

IN A METHOD OF FORMING A HELICALLY WOUND LAMINATED CORE FROM A STRIP OF MAGNETIC MATERIAL HAVING A SUCCESSION OF OPENINGS THEREIN, THE STEPS WHICH COMPRISE: SUCCESSIVELY ENGAGING THE WALLS OF THE STRIP DEFINING THE OPENINGS AND DRIVING THE STRIP EDGEWISE THROUGH A CONFINED ARCUATE PATH, COMPRESSING THE STRIP AXIALLY AS IT PASSES THROUGH THE CONFINED ARCUATE PATH TO MAINTAIN THE THICKNESS OF THE STRIP SUBSTANTIALLY UNIFORM AND FORMING SUCCESSIVE HELICAL TURNS, ADVANCING THE TURNS FROM THE CONFINED ARCUATE PATH ONTO A ROTATING ARBOR, MOVING A PUNCHING TOOL ADJACNET A PREDETERMINED POINT ON THE RESPECTIVE SIDES OF AN INDIVIDUAL TURN AS IT IS ROTATABLY DRIVEN THROUGH A CURVED PATH BY THE ARBOR, PASSING THE PUNCHING TOOL AND THE INDIVIDUAL TURN CONCURRENTLY THROUGH SAID CURVED PATH AT THE SAME SPEED AND IN THE SAME DIRECTION WHILE PUNCHING THE TURN AT THE PREDTERMINED POINT BY OPERATION OF THE TOOL DURING SUCH CONCURRENT TRAVEL, AND MOVING THE TOOL AWAY FROM THE PREDETERMINED POINT AFTER THE TURN HAS BEEN PUNCHED.