Apparatus for upward and downward movement of an arm in a robot

Details Apparatus for upward and downward movement of an arm in a robot Apparatus for upward and downward movement of an arm in a robot

1985-10-15

1987-07-28

Spar, Robert J.

Material or article handling

Load support has linear vertical movement and additional...

414751, 414718, 414719, 414732, 901 48, 901 21, 901 14, 74 8915, 212204, B66F 900, F16H 2512

Patent

active

046829300

ABSTRACT:
An apparatus connected to an arm in a robot system removes injection molded and die cast products while compensating for the load on the piston rods of the apparatus. A chuck for grasping the products is moved up and down by a pair of pneumatic cylinders on a frame and intermediate frame. The pneumatic cylinders carry the load of the various elements of the apparatus. In order to eliminate variations in the load carried by the cylinders and absorb the shock at the ends of the cylinder strokes, the apparatus includes surge tanks connected to the cylinders. Compressed air is provided through the surge tanks to provide an upward pressure offsetting the load on the cylinders. When the motor is axially movable on the frame of the apparatus, the chuck is moved over a ball nut rotatably supported on the frame, a first ball screw axially movable on the frame and connected to the motor output shaft and the intermediate frame, and a second ball screw fixed to a chuck lift frame and axially movable on the intermediate frame. The first and second ball screws are connected for synchronous rotation. When the motor is fixed on the frame, first and second ball screws are rotated synchronously through a spline shaft.

REFERENCES:
patent: 3734303 (1973-05-01), Blatt
patent: 3840128 (1974-10-01), Swoboda, Jr. et al.
patent: 3884363 (1975-05-01), Ajlouny
patent: 4024959 (1977-05-01), Gruner
patent: 4444540 (1984-04-01), Blatt et al.
patent: 4502830 (1985-03-01), Inaba et al.
patent: 4604027 (1986-08-01), Becker et al.

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