Patent ID: 6148720
Filing Date: 2000-11-21
Classification: B30B

Abstract:
A press machine comprisinga frame;a first crankshaft rotated by a driving source;a connection mechanism having a pair of levers pivotally connected with each other so as to perform a bending-stretching motion, one of the levers having a first pivot not moved by said bending-stretching motion and the other having a second pivot moved by said bending-stretching motion;a link for linking said first crankshaft with said connection mechanism so as to make said pair of levers perform an amount of bending-stretching motion with rotation of said first crankshaft;a second crankshaft having a first eccentric shaft portion connected with said second pivot and a second eccentric shaft portion connected with a slide; anda position adjusting device connected to the first pivot and movable for adjusting the position of said first pivot thereby to change the amount of bending-stretching motion.