Conveyors: power-driven – Conveyor section – Reciprocating conveying surface
Patent
1990-10-09
1992-01-14
Dayoan, D. Glenn
Conveyors: power-driven
Conveyor section
Reciprocating conveying surface
198762, 198766, B65G 2500
Patent
active
050802186
ABSTRACT:
In a vibratory parts feeder, an output power of an inverter supplying AC voltage to each vibration generator (electric power supplied to the vibration generator) or input power to the inverter is controlled so as to reach the maximum during the feeding operation so that the operational frequency is automatically adjusted to the resonant frequency. That is, upon increase or decrease of the operational frequency at predetermined intervals, the value of power supplied to each vibration generator or the inverter input power is obtained. The obtained value is compared with the last obtained value whose data is stored in a storage. When the present value is larger than the last value, the operational frequency is repetitively increased or decreased in the same direction that the present power varies relative to the last power while it is repetitively increased or decreased in the direction opposite to the direction that the present power varies relative to the last power when the present value is smaller than the last value. These frequency shifts are repetitively performed until a resonant frequency is obtained, and the feeding operation is performed at the obtained resonant frequency.
REFERENCES:
patent: 3964600 (1976-06-01), Vensel
patent: 4216416 (1980-08-01), Grace
patent: 4795025 (1989-01-01), Doke et al.
patent: 4811835 (1989-03-01), Bullivant et al.
Izume Takatomo
Shiraishi Toshirou
Dayoan D. Glenn
Kabushiki Kaisha Toshiba
Shaw, Jr. Philip M.
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