Dispensing – Movably mounted supply container
Patent
1983-05-26
1985-05-07
Rolla, Joseph J.
Dispensing
Movably mounted supply container
2281802, 427 96, B67D 564
Patent
active
045152977
ABSTRACT:
A multipoint dispensing of viscous material onto a board (23) comprises the monitoring and controlling of several process parameters such as the initial gap (.delta.) between a dispensing tool (20,25) and the board (23), the dispense pressure time cycle within the tool (FIG. 3A) and the tool velocity cycle (FIG. 3B). Also, an improved method for loading solder paste into the dispensing tool includes applying vacuum to two regions of the tool while vibrating it in its axial direction (FIG. 4). Furthermore, improved techniques for preventing crust formation on the paste within the tool, and for controlling the viscosity of the solder paste within the tool, achieve consistent dispensing results in a production environment.
REFERENCES:
patent: 2794417 (1957-06-01), Starkey et al.
patent: 3077857 (1963-02-01), Widner
patent: 3570721 (1971-03-01), Cushman
patent: 3970222 (1976-07-01), Duffield
patent: 4030640 (1977-06-01), Citrin et al.
patent: 4154379 (1979-05-01), Schermutzki
patent: 4156398 (1979-05-01), McDaniel
patent: 4156495 (1979-05-01), Weinhold
patent: 4295596 (1981-10-01), Doten et al.
"Soldering Circuit Assemblies in the 1980's" by D. Schoenthaler; Western Electric Co., Inc. U.S.A., 1980.
Schoenthaler David
Wojcik Thaddeus
AT&T - Technologies, Inc.
de Picciotto M.
Kirk D. J.
Noland Kenneth
Rolla Joseph J.
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