| 摘要 |
PURPOSE:To permit the contact of working tool with the ground in a target attitude even when lowering it from any height by a method in which the height of the working tool is measured when the lowering operation of a boom is started, and when the height is low, the attitude controlling and acting speed of the working tool is increased. CONSTITUTION:In a front loader to automatically control the attitude of a working tool in its lowering position, during the starting period of lowering action of the tool, the height of the tool is calculated from angle sensor 32 for boom, etc., by a height measurer 62. According to the height signal, the gain of a variable gain amplifying circuit 63 is automatically adjusted. In short, when the working tool is in low position, it is necessary to quickly control the attitude and, therefore, the gain is raised. Even when the lowering distance is short, the working tool can be contacted with the ground in a target attitude. |
