Weighing scales – Weigher responsive material control – Discharge valve or gate
Patent
1978-01-27
1980-03-18
Miller, Jr., George H.
Weighing scales
Weigher responsive material control
Discharge valve or gate
222505, G01G 1316, B67D 300
Patent
active
041934652
ABSTRACT:
A door mechanism for controlling flow of loose products, such as potato chips, from a scale hopper in a packaging machine comprises a hinged door, a spring biasing the door towards its closed position, an arm attached to the door, a cam follower carried by the arm, and a cam acting in combination with the cam follower to force the door open against the influence of the spring. The cam is mounted independently of the scale hopper and the cam follower is not in contact with the cam while product is being weighed in the scale hopper. When weight has been made, the cam is rotated in response to signals generated by the weighing scale. The profile of the cam is such as to rapidly open and close the door for dumping and provides smooth vibration-free operation. The slope of the cam lobe portion during opening of the door provides an uplifting scale restoring force so that the scale is immediately returned to zero weight in readiness for the next cycle.
REFERENCES:
patent: 1560416 (1925-11-01), Dickinson et al.
patent: 2890013 (1959-06-01), Schieser et al.
patent: 2904304 (1959-09-01), Zwoyer et al.
patent: 3086564 (1963-04-01), Staff
patent: 3379267 (1968-04-01), Mackenzie
Miller Jr. George H.
The Woodman Company, Inc.
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