| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to compensate travel curvatures in both forward and reverse directions accurately when the travel curvatures are different in forward and reverse travel, so that travel curvature can be corrected easily. SOLUTION: Throttle valves 31 32 are provided close to a hydraulic pump 1 and part way along pressurized oil supply conduit lines 21, 22, which run between the pressurized oil discharge openings 1b, 1c of the hydraulic pump 1 and direction control valves 23, 24. The throttle valves 31, 32 serve to bypass pressurized oil P1, P2 along the pressurized oil supply conduit lines 21, 22, and freely adjust the flow rate of the bypass pressurized oil. Similarly, part way along the forward motion hydraulic supply conduit lines 51A, 52A, and part way along the reverse motion hydraulic supply conduit lines 51B, 52B, throttle valves are provided to bypass the pressurized oil in the conduit lines and to freely adjust the flow rate of the bypass pressurized oil.
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