Patent ID: 7392125

Claim:
A working unit control apparatus of an excavating and loading machine comprising: a boom cylinder controlling a lift of a boom; a boom control valve controlling extension and compression of the boom cylinder; a boom lever instructing an extension and compression speed of the boom cylinder; a boom lever operating amount detector detecting an operating amount of the boom lever; a bucket cylinder controlling a tilt of a bucket; a bucket control valve controlling an extension and compression of the bucket cylinder; a bucket lever instructing an extension and compression speed of the bucket cylinder; a bucket lever operating amount detector detecting an operating amount of the bucket lever; and a controller outputting a boom control command value to the boom control valve on the basis of the boom lever operating amount input from the boom lever operating amount detector, and outputting a bucket control command value to the bucket control valve on the basis of the bucket lever operating amount input from the bucket lever operating amount detector, an engine rotational speed detector detecting an engine rotational speed; and a load judging portion to judge whether or not the vehicle is performing excavation, and thereupon to enable automatic operation; wherein said controller includes an automatic-operation excavation control to set and output an automatic excavation command value to each of the control valves on the basis of (a) manual non-bucket control commands and (b) a non-manual bucket control command value to the bucket control valve, which is based on any one of the engine rotational speed and the boom lever operating amount, the bucket control command value being sent upon a judgement of the load judging portion that the vehicle is performing excavation.