Metal working – Method of mechanical manufacture – Electrical device making
Patent
1987-04-28
1988-07-26
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
29740, 29743, 29840, 294 2, 294 641, H05K 330, B23P 1900
Patent
active
047591242
ABSTRACT:
Pressures applied to a component for pickup and placement thereof are each selectable, according to introduction of gas under pressure into a piston and cylinder configuration defined by a tool, such as a vacuum spindle, telescopically supported in a tool holder. An actuator with closed loop velocity and displacement control moves the tool holder to and fro along a longitudinal axis according to a known programmable controller. Thus, compression of the gas and relative displacement between the tool and holder allows controlled pick and place pressures to be varied and monitored programmably. The pressurized gas also acts to prevent dirt contamination of the bearing surface between the tool and holder and consequent impairment of telescoping and rotational movements therebetween.
REFERENCES:
patent: 4527327 (1985-07-01), Van Deuren
patent: 4611397 (1986-09-01), Janisiewicz et al.
Biesecker Douglas A.
LeRoy Bruce W.
Snyder Michael D.
Soth Henry J.
York James E.
Fidelman Morris
Hall Carl E.
Universal Instruments Corp.
Wolffe Franklin D.
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