Metal fusion bonding – With control means responsive to sensed condition
Patent
1989-06-20
1991-01-01
Heinrich, Sam
Metal fusion bonding
With control means responsive to sensed condition
228 39, 118406, 118504, B23K 300, B23K 306
Patent
active
049812483
ABSTRACT:
An electronically controlled mask shield for a wave soldering machine is disclosed which can be positioned to shield gold contacts on printed wiring boards (PWBs) during a wave soldering operation. The shield is a trough shaped member that is attached by a frame assembly to a conveyor rail of a conventional wave soldering machine. The frame assembly includes a pair of support sleeves to which the two ends of the shield are attached. The support sleeves are movable with respect to the conveyor rail between a retracted position and any desired extended position by means of a motor, and a chain and sprocket drive mechanism. A motor control circuit enables the shield to be positioned as desired, and a position responsive sensor is attached to the drive mechanism to provide signals for a position indicating display. The motor control circuit can be either manually controlled, or automatically controlled by a microprocessor.
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Digital Equipment Corporation
Heinrich Sam
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