| 摘要 |
Apparatus for sequentially coating opposite major surfaces of a workpiece such as a printed circuit board and wherein the amount of manual handling is significantly reduced. Boards are arranged end-to-end preferably in closely spaced fashion upon a conveyor having an adjustable drive. First and second spray assemblies provide a low pressure spray having a substantially oval-shaped spray pattern and are arranged upon guide tracks to move in a reciprocating fashion in a direction transverse to the direction of movement of the conveyor for coating opposing surfaces of the workpiece. The speed of movement of the spray heads and the extreme ends of the range of movement are adjustable by controlling the operation of a drive motor to create a substantially Z-shaped spray pattern on the workpiece with the size of the Z-shaped pattern being a function of the conveyor speed spray head assembly, drive speed and range of movement of each spray head assembly. Control may be exerted by a microprocessor based computer system receiving input information regarding size of workpiece, thickness of coating and the like for automatically controlling the conveyor motor and the spray assembly motor thus further simplifying the speed and ease of setup changes as well as significantly reducing waste of coating material and the like. An exhaust system is provided for each spray assembly to remove and dispose of unused spray, fumes and the like. Shields are provided to shield marginal edges of workpieces and the edge conveyors from overspray and to divert accumulated overspray to a collector.
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