| 摘要 |
PROBLEM TO BE SOLVED: To provide a farm working machine with a simple and inexpensive structure, which enables a working part to easily follow a surface subject to work, without depending on an operation by a worker and the worker's skill. SOLUTION: An attachment part 11 is connected to the working part 40 via a link mechanism for enabling the working part 40 to move in the direction of getting close to or being separated from the surface subject to work, at least during the work in the working part 40. A hydraulic cylinder 15, which is separated by a piston and which has the pressure of one cylinder chamber set higher than that of the other cylinder chamber, is attached to the link mechanism in a manner that the working part 40 is urged toward the surface subject to work. A valve 56, which reduces the pressure when the pressure of the cylinder chamber with higher preset piston pressure reaches a fixed value or above, is provided in the hydraulic circuit of the hydraulic cylinder. COPYRIGHT: (C)2008,JPO&INPIT |
