Punching unit
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United States of America Patent
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Nov 12, 2013
Grant Date -
Feb 3, 2011
app pub date -
Jun 7, 2010
filing date -
Aug 3, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a punching unit capable of punching holes in high-performance by increasing a punching force and by rotating a punch. A guide hole that guides the punch in the vertical direction is formed to have a narrow upper part, a wider lower part and inclined surfaces between them. An actuation pin engages with a cam and the punch moves up and down to punch a hole when a cam member reciprocates. The actuation pin abuts with the inclined surface of the guide hole at the punching position, so that the punch is rotated and a cam inclined angle is reduced by an inclined angle of the guide hole, allowing a large punching force.
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