| 摘要 |
PROBLEM TO BE SOLVED: To provide a press machine having a pressurizing mechanism using a four-node link type boosting mechanism, which can execute efficient press working by eliminating every useless stroke and which can securely prevent a C-frame from being subjected to the upward deflection of the open front. SOLUTION: The pressurizing mechanism of the press machine M1 comprises the boosting mechanism of which the lever ratio is variable with a four-node linkage formed among an L-type arm 40, a machine frame 10, a driving lever 20 and a connecting lever 30. External force works on one end of the driving lever so that the driving lever rotates by a specified range of angleαwith the second fulcrum A as the center. This drives the pressurizing mechanism so that a working section 41 presses a workpiece W. The range of the rotational angleαof the driving lever 20 is set to correspond substantially to the pressurizing stroke of the working section. COPYRIGHT: (C)2005,JPO&NCIPI
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