摘要:
An automatic welding apparatus comprising a workpiece fixture carried by a moving member for rotation about a horizontal axis extending in a back and forth direction, said moving member being provided on a carriage for sliding movement in a lateral direction, said carriage being provided for sliding movement in said back and forth direction, and a torch fixture carried by an arm for rotation about a vertical axis, said arm being provided for sliding movement in the vertical direction. In another embodiment, the workpiece fixture is provided only for rotation about a horizontal axis extending in the back and forth direction, and the torch fixture is carried by the arm for rotation about the vertical axis, which arm is provided at the end of a column for sliding movement in said lateral direction, which column is provided on a sliding member for sliding movement in the vertical direction, which sliding member is provided on a guide for sliding movement in said back and forth direction. The movement of these components is controlled in an electronic manner in accordance with a preset, i.e. predetermined data. The degree of freedom of the movement of the workpiece and torch is thus divided into both workpiece and torch fixtures and as a result welding a workpiece of complicated shape is possible in a better attitude of the torch and the workpiece.
摘要:
In a numerical control grinding machine, movements of a wheel head and a work table respectively in first and second directions perpendicular to each other are controlled by reference to first and second present position registers which respectively represent positions of cylindrical and shoulder grinding surfaces of a grinding wheel rotatably carried on the work head. A reference member is secured to the work table, and a wheel head reference point is defined on the wheel head. A memory device stores data which represents positions in the first and second directions, of the wheel head reference point relative to a workpiece rotational axis and the reference member when the wheel head and the work table are at respective original positions. The memory device further stores data which represents positions in the first and second directions, of the cylindrical and shoulder grinding surfaces relative to the wheel head reference point. When given a command after the present position registers lose their contents due to power failure or emergency stop, a central processing unit of a numerical controller for the machine calculates the present positions of the cylindrical and shoulder grinding surfaces based upon the stored data in the memory device and sets the present position registers respectively with the calculated present positions.
摘要:
A drive apparatus has at least two electric motors. There is also a central control common to all motors which lie in series in a closed-circuit energy supply. Each motor has an individual control unit which can be turned on and off from the central control via a control line by an address. Each motor also contains a short-circuit device lying in parallel with its connecting terminals.
摘要:
A method and apparatus are disclosed for automatically realigning a machine element to a predetermined position after an interruption of power to a drive mechanism coupled to the machine element. After the termination of power, the apparatus measures a displacement of the machine element during a predetermined period of time; and this displacement is stored in a nonvolatile memory. When power is restored to the drive mechanism, the apparatus is operative to automatically move the machine element back through a distance equal to the stored displacement. Consequently, the machine element realigns to the position it had before the power interruption.