Dispensing – Processes of dispensing
Patent
1975-10-01
1977-12-13
Reeves, Robert B.
Dispensing
Processes of dispensing
222 14, B67B 700
Patent
active
RE0294950
ABSTRACT:
An apparatus and method for a fluid metering system that employs a high resolution position sensor and electronics to very accurately control the amount of fluid dispensed. This sensor may be an optical sensor which translates the movement of a positive displacement pump into electrical signal pulses that are serially fed into a counter which converts them to parallel binary or binary-coded decimal form. The optical sensor uses a light-sensitive transducer to convert light rays to electrical pulses, a light source, and two graticule frames therebetween. One graticule frame moves relative to the other graticule. Each of the graticules has a large number of equally-spaced light-transmitting areas. Preset counts in the counter compensate for time lags in the system operation such as the lag due to the movement of the dispensing valve and the solenoid valve in an actuating piston. These preset counts are added to the serial counts from the sensor, and then an electrical signal from the counter is sent to a comparator which compares the sum with a programmable number. This programmable number directly relates to the amount of fluid it is desired to dispense. When it and the sum from the counter are equal, the comparator sends a second signal to actuate the solenoid valve which results in the fluid flow being stopped. The programmable number may be manually inputted or may be determined by any measurable characteristic of an object, like its weight, or any fixed relationship relating to the object, for example, a percentage of its weight. In a modification to the basic system, provision is also made to control the position of the object fluid is being dispensed into relative to the dispenser. Positioning is obtained by utilizing a control circuit and an hydraulic-linear actuator to move the object. This latter operation may be positionally controlled by a signal directly proportional to the object's weight, for example, the weight of a fowl that is being injected with a fluid additive.
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Graco Inc.
Reeves Robert B.
Rolla Joseph J.
Sjoquist Paul L.
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