Patent ID: 6247399
Filing Date: 2001-06-19
Classification: B30B

Abstract:
A press machine comprising a frame;a plurality of posts mounted to the frame for movement relative to the frame;an upper slide fitted to upper end portions of said posts;a lower slide fitted to lower end portions of said posts;a crankshaft rotated by a driving source;a link mechanism having first and second levers pivotally connected with each other about a joint so as to perform bending and stretching motions about that joint through a range, one of said levers having a first fulcrum connected with said frame, the first fulcrum being immovable by the bending-stretching motion, and the other lever having a second fulcrum connected with the lower slide, the second fulcrum and connected lower slide being movable by the bending-stretching motion;a connecting mechanism for connecting said crankshaft with said link mechanism so as to have the first and second levers bent and stretched as said crankshaft is rotated; andan adjusting device supported by the frame and connected by the connecting mechanism to said link mechanism and movable relative to the frame so as to adjust the range of the bending and stretching motions made by said first and second levers.