| 摘要 |
PURPOSE: A heater in a conveyor system is provided to improve a conveyor system in a PCB processing by employing a conveyor system with a simple and easily manufactured convection system that provides a low volume of air in a consistent manner to provide even and consistent convection heating to a workpiece. CONSTITUTION: Referring particularly to Fig. 2, in a liquid dispensing system, when the circuit board is in the working position, motors(20,22) stop conveyor belts(16,18) and a liquid dispensing valve(28) is lowered to dispense liquid onto the circuit board(24). The liquid for dispensing is held in a syringe(30) coupled to valve(28). Valve(28) and syringe(30) are mounted for movement along three mutually orthogonal axes. As shown generally in Fig. 2, lead screws(32) and (34) are used to move the valve along the x-axis and the z-axis (y-axis is not shown but could include a rail that supports lead screws(32,34)). A computer system (not shown) controls the movement of valve(28) and its operation to dispense liquid at desired locations.
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