Metal working – Method of mechanical manufacture – Electrical device making
Patent
1988-02-16
1989-01-10
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
2940208, 29740, 29743, 294 641, H05K 330
Patent
active
047963573
ABSTRACT:
A placement head assembly for use in an electrical component placement machine. A hollow main shaft has a carriage assembly disposed thereabouts with rollers providing axial movement along the shaft. A vacuum support shaft within the main shaft telescopes downwards to pickup and retain a component. The carriage assembly carries actuator means urging it into axial movement in response to fluid pressure differentials. Tweezer means are pendantly disposed in quadrature from pivot points about the shaft. Pivoting action of the tweezer means forces jaws radially inwards into contact with the component, thereby aligning it for subsequent board placement. In one embodiment, the actuator means includes a piston-cylinder assembly. Pressure differential across the piston causes downward movement of the carriage assembly. Reverse pressure differential urges the carriage assembly upward.
REFERENCES:
patent: 3845284 (1974-10-01), Taguchi et al.
patent: 3985238 (1976-10-01), Nakura et al.
patent: 4132318 (1979-01-01), Wang et al.
patent: 4260187 (1981-04-01), Bejczy
patent: 4329110 (1982-05-01), Schmid
patent: 4624050 (1986-11-01), Hawkswell
Carwell Robert M.
Hall Carl E.
International Business Machines - Corporation
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