A press machine comprising: a press frame; a crankshaft rotatably supported by the press frame, wherein the crankshaft has at least one first eccentric portion; at least one crankshaft motor connected to the crankshaft and driven to rotate said crankshaft; a ram; a ram guide linearly guiding said ram; a linkage type ram drive mechanism comprising: at least one main ram drive link; at least one ram drive connecting link; at least one secondary ram drive link; and at least one pivot support pin; wherein the at least one secondary ram drive link is pivotally connected at a first end to the at least one pivot support pin and at a second end to a first end of the at least one main ram drive link; and wherein the at least one main ram drive link is pivotally connected at a second end to the ram; and wherein the at least one ram drive connecting link is rotatably supported by the at least one first eccentric portion of the crankshaft at a first end and pivotally connected at a second end to the at least one main ram drive link at a point between the first and second ends of the at least one main ram drive link; characterized in that the crankshaft has at least one second eccentric portion and wherein the press machine further comprises: a dynamic counterbalance mechanism comprising: at least one main counterbalance drive link; at least one counterbalance connecting link; at least one second pivot pin; and a mass counterbalance; wherein the at least one second eccentric portion is angularly displaced substantially opposite the at least one first eccentric portion; and wherein the at least one main counterbalance drive link is pivotally supported at a first end to the at least one second pivot pin; wherein the at least one main counterbalance drive link is connected at a second end to the at least one mass counterbalance; and wherein the at least one counterbalance connecting link is rotatably supported by the at least one second eccentric portion of the crankshaft at a first end and pivotally connected at a second end to the at least one main counterbalance drive link at a point between the first and second ends of the at least one main counterbalance drive link. a press frame; a crankshaft rotatably supported by the press frame, wherein the crankshaft has at least one first eccentric portion; at least one crankshaft motor connected to the crankshaft and driven to rotate said crankshaft; a ram; a ram guide linearly guiding said ram; a linkage type ram drive mechanism comprising: at least one main ram drive link; at least one ram drive connecting link; at least one secondary ram drive link; and at least one pivot support pin; at least one main ram drive link; at least one ram drive connecting link; at least one secondary ram drive link; and at least one pivot support pin; wherein the at least one secondary ram drive link is pivotally connected at a first end to the at least one pivot support pin and at a second end to a first end of the at least one main ram drive link; and wherein the at least one main ram drive link is pivotally connected at a second end to the ram; and wherein the at least one ram drive connecting link is rotatably supported by the at least one first eccentric portion of the crankshaft at a first end and pivotally connected at a second end to the at least one main ram drive link at a point between the first and second ends of the at least one main ram drive link; characterized in that the crankshaft has at least one second eccentric portion and wherein the press machine further comprises: a dynamic counterbalance mechanism comprising: at least one main counterbalance drive link; at least one counterbalance connecting link; at least one second pivot pin; and a mass counterbalance; wherein the at least one second eccentric portion is angularly displaced substantially opposite the at least one first eccentric portion; and wherein the at least one main counterbalance drive link is pivotally supported at a first end to the at least one second pivot pin; wherein the at least one main counterbalance drive link is connected at a second end to the at least one mass counterbalance; and wherein the at least one counterbalance connecting link is rotatably supported by the at least one second eccentric portion of the crankshaft at a first end and pivotally connected at a second end to the at least one main counterbalance drive link at a point between the first and second ends of the at least one main counterbalance drive link. a dynamic counterbalance mechanism comprising: at least one main counterbalance drive link; at least one counterbalance connecting link; at least one second pivot pin; and a mass counterbalance; at least one main counterbalance drive link; at least one counterbalance connecting link; at least one second pivot pin; and a mass counterbalance; wherein the at least one second eccentric portion is angularly displaced substantially opposite the at least one first eccentric portion; and wherein the at least one main counterbalance drive link is pivotally supported at a first end to the at least one second pivot pin; wherein the at least one main counterbalance drive link is connected at a second end to the at least one mass counterbalance; and wherein the at least one counterbalance connecting link is rotatably supported by the at least one second eccentric portion of the crankshaft at a first end and pivotally connected at a second end to the at least one main counterbalance drive link at a point between the first and second ends of the at least one main counterbalance drive link.