Punching Unit
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United States of America Patent
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-
N/A
Issued Date -
Mar 20, 2008
app pub date -
Oct 6, 2004
filing date -
Oct 6, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An inventive punching unit is provided with punches (2) whose blade (2a) is cut away in a shape of V at a shearing angle (a) whose apex (b) is set at a position offset from an axial center line (O-O) of the punch (2) by a predetermined distance (c). Because the lengths of left and right edges (P3 and P4) of the blade (2a) are different and these edges (P3 and P4) contact with a sheet at staggered timing, a peak value of punching force of the punch (2) may be lowered. Thus, the peak values of the punch are lowered and hence a driving force is lowered.
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