Patent ID: 7028611

Claim:
A link type punch press characterized by comprising a motor, a link mechanism that converts rotating operation transmitted by the motor via a drive transmitting system, into a linear operation, and a ram installed below said link mechanism to elevate and lower for press working on the basis of said linear operation, said link mechanism comprising a crank member having a crank shaft and an eccentric shaft portion, a pivoting link having a first to third connecting portions located at vertices of a triangle and which are used for rotatable connections, the first connecting portion being connected to the eccentric shaft portion of said crank member, a connecting rod having opposite ends connected to the second connecting portion and an upper end of said ram, respectively, and a restraining link having a proximal end rotationally movably connected to a frame and a leading end connected to the third connecting portion of said pivoting link, to regulate pivoting of said pivoting link, and in that the punch press further comprises working type selecting means for selecting the type of quality of punching and motor rotating-direction control means for switching a rotation of said motor between a forward direction and a backward direction depending on the type of working selected by the working type selecting means.