PUNCHING UNIT
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United States of America Patent
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N/A
Issued Date -
Jun 16, 2011
app pub date -
Dec 1, 2010
filing date -
Dec 10, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention provides a rotary-type punching unit that solves a problem of a prior art rotary-type punching unit that its punching torque is highly peaked in beginning and ending punching, thus disabling to punch a heavy paper or the like and degrading the quality level of punch holes. A blade surface of a punch of the invention is formed as an inclined surface inclined with respect to the outer peripheral surface of a punch shaft or of a die shaft such that a leading edge thereof is higher than a trailing edge with an inclination angle within a range of 5° to 15° (preferably 10°). A die surface of the die is formed into a surface of a circular arc centering on a rotational axis of the shafts. Thereby, the peaks of the punching torque are reduced and the quality level of the punch hole is kept high.
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