Zero error Z-axis compliance robotic device and process

Details Zero error Z-axis compliance robotic device and process Zero error Z-axis compliance robotic device and process

1992-10-30

1995-06-06

Underwood, Donald W.

Material or article handling

Load carried along a horizontal linear path

Having gripper means

29740, 29832, 901 16, 901 29, 901 45, 901 49, B25J 1702

Patent

active

054216966

ABSTRACT:
Disclosed is a robotic device having a sub-assembly constructed and arranged for zero error Z-axis compliance. The sub-assembly includes a vertically positioned bearing assembly having a shaft received in a ball bushing. The ball bushing may be received in a race. Spherical-shaped bearings are positioned in the bushing and project outwardly from the outer and inner surfaces of the bushing to form a smooth linear traveling surface. A plurality of lines of bearings may be positioned in the bushing. Each line of bearings may be skewed from the longitudinal axis of the bushing so that the lines of bearings form a blanket bearing surface covering substantially the outer surface of the shaft and inner surface of a race. In such a construction each bearing engages a different portion of the shaft and race as the bushing and shaft move in a vertical direction along the Z-axis. This reduces the wear on all contact surfaces and prolongs the life of the sub-assembly.

REFERENCES:
patent: 3824674 (1974-07-01), Inoyama et al.
patent: 3922037 (1975-11-01), Yamada et al.
patent: 4648727 (1987-03-01), O'Neil et al.
patent: 4827607 (1989-05-01), Kobunsky et al.
patent: 4836111 (1989-06-01), Kaufmann
patent: 4848757 (1989-07-01), DeFazio

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