| 摘要 |
PROBLEM TO BE SOLVED: To provide an angle measurement device that enables measurement in the relatively narrow roll angle of a degree to turn a bottom according to a depth of tilling in the plowing work and has a low cost and simple structure.SOLUTION: An angle measurement device 30 includes a turning transmission tool 31 turned along with a main shaft 14 and a potentiometer 32 mounted on a mast 6. The potentiometer 32 has a turning rod 43 biased to become a fixed angle position with a stretching coil spring 49. The turning transmission tool 31 is engaged with the turning rod 43 of the potentiometer 32, in a predetermined turning angle range for tilting and turning the bottom in the working posture position in the field work centering on a main shaft 14 to a front frame, when any of a first bottom and a second bottom is in the working posture position of the lower side. The turning rod 43 of the potentiometer 32 is turned by the turning of the turning transmission tool 31 or by the biasing force of the stretching coil spring 49, and thereby the measurement of the turning angle is made possible.SELECTED DRAWING: Figure 4 |
