Handling: hand and hoist-line implements – Grapple – Load shifting
Patent
1988-02-08
1989-05-16
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Load shifting
294907, 901 46, B25J 1902
Patent
active
048304204
ABSTRACT:
A gripping device for an apparatus for placing electronic and/or electrical components on a substrate comprises a pair of grippers (1 and 2) which are movable relative to one another by compressed-air or vacuum to close and open the jaws (4 and 5) of the grippers. For indicating the absence of a component between the gripper jaws when the jaws are closed, an orifice (1) is provided which communicates with a source of compressed air or vacuum at least during the closing movement of the jaws so that air flows through the orifice during this movement. If the jaws are closed to less than a predetermined distance between them which is equal to the width of the smallest component to be handled by the gripping device, the orifice is closed by one (1) of the grippers to interrupt the flow of air through the orifice. The orifice is formed in a body (6) which is fixed in relation to the movements of the grippers and which is formed on two opposite sides with abutment surfaces (7 and 8) which limit the closing movement of the grippers and in one (7) of which the orifice is formed.
REFERENCES:
patent: 4533167 (1985-08-01), Johnson
patent: 4549425 (1985-10-01), Wisebaker et al.
IBM Technical Disclosure Bulletin, vol. 24, No. 10, Mar. 1982, "Combined Compliance Structure and Air Gauge Sensor" by Brennemann.
van de Ven Johannes T. A.
Vermeer Adrianus J. P. M.
Cherry Johnny D.
U.S. Philips Corporation
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