Patent ID: 9452581
Filing Date: 2016-09-27
CPC Classification: B30B

Claim Text:
1. A press machine comprising: a press frame; a ram; a crankshaft rotatably supported by the press frame, wherein the crankshaft has an eccentric portion; a linkage type ram drive mechanism operably connected between the ram and the crankshaft; a first drive motor, with a first rotary position feedback device, said first motor connected to a first end of the crankshaft and driven to rotate said crankshaft from said first end; and a second drive motor, with a second rotary position feedback device, said second motor connected to a second end of the crankshaft and driven to rotate said crankshaft from said second end; and wherein the eccentric portion of the crankshaft is located between the first and second ends of the crankshaft.