Reworking methods and apparatus for surface mounted technology c

Details Reworking methods and apparatus for surface mounted technology c Reworking methods and apparatus for surface mounted technology c

1986-02-21

1987-09-29

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Electrical device making

29700, 228 20, 2281802, H05K 300, B23P 1900

Patent

active

046960961

ABSTRACT:
Methods and apparatus for reworking printed circuit boards carrying surface mounted components by removing faulty or improperly connected components and replacing them with new components, incorporate an X-Y table for clamping the board with the target component positioned on a vertical working axis, using a heated, component-gripping vacuum head movably mounted for vertical movement and angularly rotatable pivoting adjustment, and jets of hot compressed air directed at the component's peripheral terminal leads, bringing them to solder-melting temperature, with a reversible angular drive motor connected to deliver torque to the head gently or abruptly or in reciprocating fashion, producing pivoting head movement over a small angle of rotation, shearing the adhesive which bonds the component in place, all under control of a programmed microcomputer governing operating sequences selected and initiated by the operator. The same mechanisms and techniques are employed to position and solder a new component in place.

REFERENCES:
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patent: 4552300 (1985-11-01), Zovko et al.
patent: 4564135 (1986-01-01), Barresi et al.
patent: 4605152 (1986-08-01), Fridman

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