Method for punching before performing rotated lamination
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United States of America Patent
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Jan 29, 2013
Grant Date -
Feb 3, 2011
app pub date -
Jul 26, 2010
filing date -
Jul 31, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A movable punch punches a plate piece from an original material sheet. The punched plate piece is rotated relative to and laminated onto another plate piece. A plurality of projections are formed on the outer circumference of each plate piece. The movable punch has a plurality of projection forming blades, the number of which is greater than the number of the projections of the plate pieces. Prior to the punching of the plate piece by means of the movable punch, blank holes for nullifying the formation of the projections are formed in the original material sheet at positions that correspond to projection forming blades. Further, as the punching of the plate pieces from the original material sheet progresses, the positions of the blank holes are changed.
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