Abstract: A process of, and apparatus for, the feeding of elongated strips of magnetic core stock material to successive stations of a multi-station die assembly for forming successive lamination blanks into individual magnetic core lamina is disclosed. To properly align the material with the corresponding dies, relative motion between each pair of successive lamination blanks is facilitated while those blanks are still joined. This relative motion is provided by significantly weakening the material in the region between two successive lamination blanks. In the illustrated preferred embodiment, the provision for relative motion includes removing the majority of the material interconnecting two adjacent lamination blanks without separating the individual lamination blanks from one another by use of an additional punch and die at the initial station for partially severing the strip between adjacent lamination blanks.

Abstract: A method and apparatus for manufacturing a lamina stack having laminas with a plurality of outer perimeter configurations. Each of the outer perimeter configurations has at least one common choke surface. The common choke surfaces form, when the laminas are stacked, a choke contacting surface on the outer perimeter surface of the lamina stack which extends continuously in the axial direction from the top lamina to the bottom lamina. The invention provides a method for manufacturing interlocked lamina stacks using a selectively actuated punches in a die assembly to stamp laminas with a plurality of outer perimeter configurations and to stack the laminas in a choke barrel with an alignment surface which cooperates with the common choke surface and securely holds the stamped laminas in position while the stack is being formed. Rotation of the choke barrel compensates for strip thickness variations.

Abstract: A tandem press system for the high speed manufacture of rotor cores and stator cores of electric motors. The tandem press system includes a rotor press and a stator press arranged in series for stamping out laminations from a web of stock material and pre-assembling them into rotor cores and stator cores, respectively. Structure is provided between the rotor and stator press to maintain control of the web and provide a substantial barrier to transmission of vibrations in the web to the stator press. The rotor and stator presses are capable of shifting from stamping one type of lamination to stamping another type of lamination without any interruption in the operation of the presses.

Abstract: A method and apparatus for manufacturing a lamina stack having laminas with a plurality of outer perimeter configurations. Each of the outer perimeter configurations has at least one common choke surface. The common choke surfaces form, when the laminas are stacked, a choke contacting surface on the outer perimeter surface of the lamina stack which extends continuously in the axial direction from the top lamina to the bottom lamina. The invention provides a method for manufacturing interlocked lamina stacks using a selectively actuated punches in a die assembly to stamp laminas with a plurality of outer perimeter configurations and to stack the laminas in a choke barrel with an alignment surface which cooperates with the common choke surface and securely holds the stamped laminas in position while the stack is being formed. Rotation of the choke barrel compensates for strip thickness variations.

Abstract: A tandem press system for the high speed manufacture of rotor cores and stator cores of electric motors. The tandem press system includes a rotor press and a stator press arranged in series for stamping out laminations from a web of stock material and pre-assembling them into rotor cores and stator cores, respectively. Structure is provided between the rotor and stator press to maintain control of the web and provide a substantial barrier to transmission of vibrations in the web to the stator press. The rotor and stator presses are capable of shifting from stamping one type of lamination to stamping another type of lamination without any interruption in the operation of the presses.