The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1992
Filed:
Oct. 09, 1990
Takatomo Izume, Kuwana, JP;
Toshirou Shiraishi, Yokkaichi, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
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.