Variable volume positive displacement dispensing system and method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Feb 4, 2003
Grant Date -
N/A
app pub date -
Jan 14, 2000
filing date -
Jan 14, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Aspects of the present invention are directed to methods and apparatus for dispensing material onto substrates. A dispensing system is provided for dispensing a metered quantity of dispensing material onto a substrate. The dispensing system includes a dispensing pump, a container, coupled to the dispensing pump, to contain the material prior to dispensing, and a computer control system to control operation of the dispensing pump. The dispensing pump includes an inlet that receives material from the container, an outlet from which material is dispensed, a plurality of dispensing chambers each chamber having a piston movable within the chamber, a valve, positionable to selectively couple the dispensing chambers to the inlet and the outlet, a drive cam, coupled to the pistons, to control movement of the pistons within the chambers to draw dispensing material into the chambers and to dispense dispensing material from the chambers, and a motor coupled to the computer control system and to the drive cam to provide movement of the drive cam to cause dispensing material to dispense from the dispensing pump.
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