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Positive Displacement Dispenser

IP.com Disclosure Number: IPCOM000083517D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Willard, LA: AUTHOR

Abstract

Described is a positive displacement dispenser for thick viscous liquid materials, such as epoxy, to within +/- 10 milligrams.

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Positive Displacement Dispenser

Described is a positive displacement dispenser for thick viscous liquid materials, such as epoxy, to within +/- 10 milligrams.

The apparatus comprises a base 10 containing a pipe 11 coupled to a reservoir, not shown. The reservoir forces a quantity of thick viscous epoxy material 12 into the pipe 11. Disposed over the base 10 is a dispense head 13 containing a cavity 14 into which a piston 15 can be introduced. The dispense head 13 is driven by an air cylinder, not shown, laterally across the surface of the base 10 until the cavity 14, has its inlet port 16 aligned with a connecting tube 17 coupled to the input pipe 11.

At this time the piston 15 is withdrawn from the cavity 14, permitting the viscous material 12 to flow into the cavity 14 and fill it with a specified amount of viscous epoxy. Once the known amount of epoxy has been forced into the cavity 14, the dispensing head 13 is again laterally translated until the port 16 is aligned with a dispensing tube 18, which passes through the bottom of the base 10 and is isolated from the dispensing pipe 11.

At this time the piston 15 is forced down through the action of an air piston 19 to which it is coupled. The action of the air piston 19 compresses a spring 20 forcing the piston 15 down into the cavity 14, causing the material contained in the cavity 14 to be dispensed out of the tube 18.

The amount of material admitted into the cavity 14 can be controlled by a regulatory nut 21,...