Patent ID: 7402037

Claim:
A mold clamping unit comprising: a column mounted in a transfer means and moving in forward and backward directions; a mold clamping piston in which a locking operation with the column; a plurality of column teeth disposed on a surface of the column along an axial direction of the column, a space between the column teeth being defined as a column groove by the column teeth; a center bore provided in a central portion of the mold clamping piston so that the column can penetrate and can move through the center bore when the column moves in forward and backward directions; a clamping tooth seating groove provided inside the mold clamping piston contacting the center bore along a circumference of the center bore; a plurality of clamping teeth seated in the clamping tooth seating groove in a circumferential direction; a rotating plate in one side of the clamping teeth; a plurality of clamping tooth guide grooves having a predetermined length provided on the rotating plate toward a center from an outer wall of the rotating plate; and a teeth rod positioned in each of the clamping tooth guide groove, wherein each teeth rod is connected to each clamping teeth so that, when the rotating plate makes a rotational motion, each teeth rod can move in the clamping teeth guide groove, each clamping tooth can move in a central or radial direction of the rotating plate and clamping of the clamping tooth and the column can proceed.