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US 5,767,455 AGranted
Apparatus and method for controlling a vibratory feeder in a weighing machine
AssigneeUpper Limits Engineering Co.
InventorOren A. Mosher
Life of this patent
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AssigneeUpper Limits Engineering Co.
InventorOren A. Mosher
Estimating the term…
Apparatus and methods are shown for controlling a weighing machine in which product is fed into one end a vibratable pan of a vibratory feeder and is discharged from the other end, for example into a weigh bucket. In a first embodiment, the amplitude of vibration of a pan is measured and is compared to a desired amplitude. The measured amplitude is compared to a desired amplitude, and the amplitude of vibration is adjusted by modifying an input signal to a vibrator attached to the pan until the measured amplitude equals the desired amplitude. In a second embodiment, a mechanism is included to stop the loading of product into a pan when a predetermined amount of product has been discharged from a pan into a weigh bucket, and the weight of product in the pan is monitored as additional product is discharged into the weigh bucket Only a preselected additional weight of product is subsequently discharged into the weigh bucket. A third embodiment involves at least two pans arranged in series, and the weight of product in the downstream pan is determined and monitored. The measured weight is compared to a desired weight of product in the downstream pan, and the amplitude of vibration of the upstream pan is adjusted, as needed, in a closed-loop manner to feed more or less product into the downstream pan to establish and maintain the desired weight in the downstream pan.
An apparatus for controlling the feeding of product in a weighing machine from a product supply source into one end of a pan of a vibratory feeder, moving the product towards an opposite end of the pan as a vibrator drives the pan in response to an input signal, and discharging the product from the opposite end of the pan into a weigh scale, the apparatus comprising:
A method for controlling the feeding of product in a weighing machine from a product supply source through a pan of a vibratory feeder, as a vibrator drives the pan in response to an input signal from a power source, and causes the product to be discharged from the pan into a weigh scale, the method comprising the steps of:
A method of controlling feeding of product in a weighing machine from a product supply source through a pan of a vibratory feeder as product is discharged from pan to a weigh scale, the method comprising the steps of:
Dependencies are inferred from the claim text.