Wooden receptacles – Baskets – Closures
Patent
1995-12-27
1997-05-20
Paschall, Mark H.
Wooden receptacles
Baskets
Closures
21912154, B23K 1000
Patent
active
056309520
ABSTRACT:
A plasma-arc power supply apparatus includes a main electrode terminal, a nozzle electrode terminal and a workpiece terminal which are respectively coupled to a main electrode, a nozzle electrode and a workpiece of a plasma-arc apparatus. A DC power supply has its first output terminal coupled to the main electrode terminal, and a second output terminal. A pilot arc path is coupled between the second output terminal and the nozzle electrode terminal. A switch is connected in the pilot arc path. A plasma-arc path is coupled between the second output terminal and the workpiece terminal. A current detector has its first input coupled to the plasma-arc path, has its second input coupled to the pilot arc path, and produce a detection signal corresponding to the values of pilot arc and plasma-arc currents in the pilot arc and and plasma-arc paths, respectively. When the pilot arc current is flowing, a control unit closes the switch and controls current from the DC power supply in accordance with the difference between detection signal and a predetermined pilot arc reference signal, and when the plasma-arc current is flowing, the control unit opens the switch and controls current from the DC power supply in accordance with the difference between the detection signal and a predetermined plasma-arc signal.
REFERENCES:
patent: 5170030 (1992-12-01), Solley et al.
patent: 5225658 (1993-07-01), Yamaguchi et al.
patent: 5506384 (1996-04-01), Yamaguchi
patent: 5530220 (1996-06-01), Tatham
Fujiyoshi Toshikazu
Hashimoto Takashi
Karino Kunio
Kinoshita Atsushi
Moriguchi Haruo
Murray William H.
Paschall Mark H.
Rosenthal Robert E.
Sansha Electric Manufacturing Company Limited
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