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US 4,331,263 AGranted
Control unit for use in a vibratory feeder system
AssigneeChristopher Scientific Company
InventorGeorge J. Brown
Life of this patent
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AssigneeChristopher Scientific Company
InventorGeorge J. Brown
Estimating the term…
A control unit for controlling a vibratory bowl feeder which is effective to maintain, for varying feeder loads, a constant preselected amplitude of bowl feeder vibration at a vibratory frequency which coincides with the changing mechanical resonant frequency of the feeder system. The control unit includes a sensor which detects the amplitude and frequency of feeder bowl vibration, a frequency control loop and an amplitude control loop. The frequency control loop is responsive to the detected frequency of vibration and provides an oscillating signal which coincides with the resonant frequency of the system. The amplitude control loop is responsive to the detected amplitude of vibration and includes a variable gain amplifier which amplifies the oscillating signal to provide a feeder driving signal which causes the feeder to vibrate at the system resonant frequency at a preselected amplitude. The sensor for detecting amplitude and frequency of the bowl vibration is preferably a device for sensing the third harmonic of the drive current in the electromagnetic drive of the system. A variable capacitive reactance coupling circuit between the power drive amplifier as the electromagnetic drive of the system is set to match the inductive reactance of the electromagnetic drive.
In a vibratory feeder system for delivering product at a predetermined rate including a vibratory feeder having a platform for receiving a product dispensing receptical and an electromagnetic driver unit for imparting reciprocal vibratory movement to said platform, an improved control unit therein comprising:
In a vibratory feeder system for delivering product at a predetermined rate including a vibratory feeder having a platform for receiving a product dispensing receptical and an electromechanical driver unit for imparting reciprocal vibratory motion to said platform, an improved control unit comprising:
In a vibratory system including a vibrating body having an electromagnetic driver unit for imparting vibratory movement thereto, an improved control unit comprising:
In a vibratory feeder system for delivering product at a predetermined rate including a vibratory feeder having an electromagnetic driver unit for imparting vibratory movement an improved control unit comprising:
In a system including a vibrating body and an electromagnetic driver unit for imparting vibrating motion thereto, an improved means for sensing the vibratory movement of said body, comprising:
Dependencies are inferred from the claim text.