B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
B05D 1/32 (2006.01) B05B 1/30 (2006.01) B05B 12/06 (2006.01) B05B 15/04 (2006.01) H05K 3/00 (2006.01) H05K 3/28 (2006.01) B05B 7/12 (2006.01)
Patent
CA 2097135
A film coater for applying a coating material to selected areas on a target substrate, such as a printed circuit board, having a dispenser body with a plunger moveable therein between an open and closed position. A flow of pressurized air which moves the plunger to the open position is controlled by a valve carried by the dispenser body, and a plurality of springs return the plunger to the closed position. The number of return springs is selected to provide a variable biasing force so that movement of the plunger is controlled to eliminate or at least significantly reduce hammering, tapering and drooling, particularly when the dispenser is operated intermittently.
Hogan Patrick T.
Turner James J.
Corporation Nordson
Macrae & Co.
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