Conveyors: power-driven – Conveyor for changing attitude of item relative to conveyed... – By actuating item-holder relative to holder-carrying conveyor
Patent
1975-03-21
1976-09-21
Love, John J.
Conveyors: power-driven
Conveyor for changing attitude of item relative to conveyed...
By actuating item-holder relative to holder-carrying conveyor
148182, 198342, 198655, B65G 4724
Patent
active
039813924
ABSTRACT:
In fabricating sealed contacts, often their axially extending leads are solder coated to protect them from contamination and to enhance their solderability into circuits. An apparatus for solder coating the leads, which minimizes their bending, includes a conveying apparatus that moves the contacts through various stages of the solder coating apparatus to form layers of solder on the leads. These layers, which are carefully controlled, are no greater than a certain maximum thickness, and are thinner on the ends of the leads than on the side surfaces thereof.
To coat the leads, the contacts are individually mounted in a plurality of holders, each of which is fixed to an individual bead of an endless bead chain of the conveying apparatus. As the chain is advanced through a passageway of a tube having various curvilinear and rectilinear slots formed in the outer surface thereof, the holders extending through these slots are oriented in various longitudinal positions along the tube and angular positions about the chain to appropriately orient the leads through the stages of the solder coating apparatus.
In a first stage, the contacts are loaded into the holders from a bin and moved in a predetermined orientation to a second stage where a mixture of powdered solder and flux is applied to each lead by coating wheels having resilient peripheral surfaces. The leads are moved into simultaneous contact with these surfaces to coat the side surfaces and ends of the lead with the mixture.
Next, the leads are moved in the same orientation by the chain through a heating apparatus having a baffle arrangement to substantially confine hot gases to the vicinity of the leads to melt the solder of the mixture. The chain then moves the solder coated leads longitudinally along the tube and rotatably about the chain due to the camming action of the slots on the holders. This changes the angular orientation of the leads and immerses the contacts and leads in a cleaning bath to remove any residual flux from the leads. The contacts are next rotatably and longitudinally moved out of the cleaning bath and into a rinsing bath. Finally, the contacts are moved through a drying chamber to remove any remnants of the rinsing bath and are stripped from the holders into a bin.
REFERENCES:
patent: 2952567 (1960-09-01), Nordquist et al.
patent: 2974773 (1961-03-01), Vaughan et al.
patent: 3788455 (1974-01-01), Dieckmann
Western Electric Technical Digest, vol. 24, pp. 7-8, Oct. 1971, "Bead Chain Orienting Conveyor," Brown & Merwarth.
Booz David L.
Brown Ford J.
Merwarth Richard J.
Love John J.
Peters R. Y.
Watts Douglas D.
Western Electric Company Inc.
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