Abstract: A connection mode of connector members is changed so that a control signal for the same control direction (e.g. fore and back direction) of a control member is output from different terminals (a terminal for an arm drive signal) and (a terminal for a swing drive signal) of the connector member.

Abstract: A control device for working machines capable of controlling the moving of a tool continuously over a wide range, and capable of moving it accurately along a desired path. Out of not less than three control shafts (3a, 4a, 5a), a first combination of two control shafts (3a, 5a) is selected, and a bucket (6) is moved in a first section (A-B) out of travelling path thereof with the driving of the two selected shafts (3a, 5a) controlled. A second combination of two control shafts (3a, 4a) which is different from the selected first combination of two control shafts (3a, 5a) is then selected, and the bucket (6) is moved in a second section (B-C), which is continuous from the first section (A-B), with the driving of the two selected shafts (3a, 4a) controlled.

Abstract: A construction machinery having a first boom 1 rotatably mounted on a vehicle frame, a second boom 4 rotatably mounted on the first boom 1, a first boom cylinder 2 connecting the vehicle frame 3 and the second boom 4, and a second boom cylinder 5 connecting the second boom 4 and the first boom 1, characterized in that it is arranged in such a way that the drive of the working machines in the new link mechanism is controlled simply and with high precision by indicating the position or the velocity of the working machine leading end by subjecting a working machine leading end target value to coordinate conversion to the target angles for the first and second boom angles, determining the target cylinder length for the first boom cylinder 2 from the target angles for the first and second boom angles obtained by the coordinate conversion, and driving the first boom cylinder 2 according to the target cylinder length.