Patent ID: 7209820

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 the 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, wherein said working unit control apparatus is additionally provided with a mode selecting button setting a mode for outputting the bucket control command value in a continuous manner or a pulse manner, a mode selecting signal output from the mode selecting button is input to the controller, and said controller has automatic excavation control means setting and outputting an automatic excavation command value to each of the control valves on the basis of a manual command and a judgement of a load judging portion judging whether or not the vehicle is under excavation, and said automatic excavation control means is structured such as to switch the output mode on the basis of the mode selecting signal.