Weighing scales – Weigher responsive material control – Feed
Patent
1989-03-06
1990-09-04
Miller, Jr., George H.
Weighing scales
Weigher responsive material control
Feed
177DIG11, 222196, G01G 1302, B65G 6906
Patent
active
049536435
ABSTRACT:
An inexpensive, reliable, accurate, high speed powder dispensing apparatus is disclosed which includes a barrel for transferring powder from a first retainer to a second retainer. The barrel is vibrated to cause the powder to translate on a surface thereof. The vibration is controlled to cause a measured amount of powder to be dispensed. In a specific embodiment, two barrels are included to provide coarse and fine rates of powder dispensation. A specific embodiment includes a scale for weighing the discharged powder. The scale is equipped with a sensor, the output of which is used to control and limit the rate of powder flow up to a preselected amount. An additional novel feature of the invention is the use of a mechanism to assist in overcoming the inertia of the scale.
The invention provides an inexpensive, reliable, accurate, high speed powder dispensing apparatus. As the need to rotate barrels of the prior art is eliminated, the likelihood of occasional jamming is minimized. The momentum of the apparatus of the present invention is orders of magnitude lower than prior similar apparatus. As a result, the apparatus of the present invention ceases to dispense powder as soon as the power is shut off. The extremely low inertia of the vibrating barrels and the unique spring allow all types of powder to be dispensed rapidly and reliably without the requirement to adjust the relative positions of the fast and slow barrel sensors thereby decreasing complexity and costs.
REFERENCES:
patent: 3259272 (1966-07-01), Larson
patent: 4359175 (1982-11-01), Lizenby
patent: 4684041 (1987-08-01), Jones et al.
patent: 4696356 (1987-09-01), Ellion et al.
Ellion Dolores D.
Ellion M. Edmund
Benman, Jr. William J.
Miller Jr. George H.
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