Patent ID: 7143675
Filing Date: 2006-12-05
Classification: B26D,B26F,Y10T

Abstract:
1. A puncher having a double cutter linkage structure comprising: a rotatable driving shaft; a driving plate having an intermediate portion affixed to said driving shaft for rotation therewith, said driving plate having a pair of end portions extending from said intermediate portion; a front linking rod having a first end pivotally coupled to a first of said pair of end portions of said driving plate for substantially linear displacement thereof responsive to rotative displacement of said driving plate and a second end displaced from said first end by a first distance; a rear linking rod having a first end pivotally coupled to a second of said pair of end portions of said driving plate for substantially linear displacement thereof responsive to rotative displacement of said driving plate, said rear linking rod having a second end displaced from said first end by a second distance, said second distance being greater than said first distance, said second end of said rear linking rod being curved to face said first end thereof; a front cutter seat pivotally coupled to said second end of said front linking rod for linear displacement therewith; a rear cutter seat pivotally coupled to said second end of said rear linking rod for linear displacement therewith; a front cutter affixed to said front cutter seat for displacement therewith and extending in a first direction; a rear cutter affixed to said rear cutter seat for displacement therewith and extending in a second direction, said second direction being opposite to said first direction; and a positioning seat disposed between said front cutter and said rear cutter, said positioning seat having a front plate and a rear plate, said front plate having a through hole for said front cutter to extend therethrough and said rear plate having a through hole for said rear cutter to extend therethrough, wherein said front cutter and said rear cutter are simultaneously displaced through a respective one of said through holes of said front plate and said rear plate responsive to rotation of said driving shaft.