| 摘要 |
In a press brake relatively moving an upper table ( 5 U) or a lower table ( 5 L) upward and downward by a plurality of hydraulic cylinders ( 17 L and 17 R) so as to perform a bending work, the respective hydraulic cylinders ( 17 L, 17 R) are driven by individually controlling a pair of left and right two-way fluid pumps and hydraulic devices ( 21 L, 21 R) provided in correspondence to the respective hydraulic cylinders ( 17 L, 17 R) The two-way fluid pumps and the respective hydraulic devices ( 21 L, 21 R) are mounted to a base plate ( 23 ) mounted to cylinder heads ( 18 L, 18 R) of the respective hydraulic cylinders ( 17 L, 17 R), and an oil tank ( 27 ) is provided in an upper side of the hydraulic devices ( 21 L, 21 R).
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