Patent ID: 9511405
Filing Date: 2016-12-06
CPC Classification: B21D,H02K,Y10T

Claim Text:
1. A multi-workstation iron core-producing apparatus in combination with an iron strip that blanks iron cores from the iron strip such that a longitudinal direction of the iron cores is inclined relative to a direction of a width of the iron strip at an acute inclination angle, the multi-workstation iron core-producing apparatus comprising: a guide that guides the iron strip sequentially through a plurality of workstations along a longitudinal direction of the iron strip; a first workstation having caulking portion-forming holes and punches that intrude into the respective caulking portion-forming holes and that simultaneously form first plural sets of caulking portions at a predetermined pitch in the iron strip, wherein a longitudinal direction of rows of the caulking portion-forming holes and the punches in the first workstation is inclined at an acute angle relative to the direction of the width of the iron strip; and a second workstation that includes a die, a die holder for fixing the die, a punch, and a blanking drop hole formed in the die to form a first iron core from the iron strip by punch blanking, wherein the blanking drop hole extends in a longitudinal direction and is inclined at the acute angle relative to the direction of the width of the iron strip, a third workstation having a punch that intrudes into caulking portion-forming holes and that simultaneously forms second plural sets of caulking portions in the iron strip at the predetermined pitch in the iron strip; and a fourth workstation that forms a second iron core by blanking from the iron strip in which the second plural sets of caulking portions were formed at the third workstation, wherein the guide includes engagement projections for engagement of pilot holes formed at a predetermined pitch in opposite side edge portions of the iron strip, wherein the pilot holes in the opposite side edge portions of the iron strip are not directly opposite one another, and wherein a line that intersects the pilot holes on a first side edge portion of the iron strip also intersects the first iron core, and a line that intersects the pilot holes on a second side edge portion of the iron strip also intersects the second iron core.