Abstract: In order to solder a lead wire of an electronic device to a wiring pattern formed on a printed circuit board, the electronic device is first placed on a first face of the printed circuit board such that the lead wire thereof are protruded from a second face of the printed circuit board, on which the wiring pattern is formed. Then cream solder is coated on the protruded lead wire. On the other hand, there is provided a liquefied heat medium having a temperature higher than a melting temperature of the cream solder. The second face of the printed board is immersed in the liquefied heat medium in a predetermined time period, to melt the cream solder. Finally, the printed board is lifted from the liquefied heat medium.

Abstract: In order to solder a lead wire of an electronic device to a wiring pattern formed on a printed circuit board, the electronic device is first placed on a first face of the printed circuit board such that the lead wire thereof are protruded from a second face of the printed circuit board, on which the wiring pattern is formed. Then cream solder is coated on the protruded lead wire. On the other hand, there is provided a liquefied heat medium having a temperature higher than a melting temperature of the cream solder. The second face of the printed board is immersed in the liquefied heat medium in a predetermined time period, to melt the cream solder. Finally, the printed board is lifted from the liquefied heat medium.

Abstract: A air-core coil forming system which comprises a sheath peeling section and a coil forming section. The sheath peeling section includes a rotatable cylindrical cutting head having a through hole provided at radial center portion thereof into which the sheathed wire is inserted, a blade portion for peeling the sheath of the sheathed wire, and a blade support member for supporting in a manner that the blade is brought into contact with the sheath by means of a centrifugal force produced when the cutting head is rotated, a motor directly connected with the cutting head for rotating the same, and a rotary shaft provided in the motor such that a central axis thereof coincides with the through hole of the cutting head and having hollowed structure into which the sheathed wire is inserted.