PURPOSE: To prevent breakage and running inability of electric conductive tape by detaching an electrode from an electric conductive tape about in the direction perpendicular to the surface of electric conductive tape after welding and detaching an electric conductive tape from the surface of material to be welded about in the direction perpendicular to the surface.
CONSTITUTION: The prescribed energizing time and holding time to materials 30, 31 to be welded by upper/lower electrodes 1, 2 are elapsed, the lower electrode 2 is detached from a lower electric conductive tape 33 about in the vertical direction by forces of each spring 72, the electric conductive tape 33 is detached from a lower material 31 to be welded about in the vertical direction by forces of each spring 82. Also, an upper electric conductive tape 32 is detached from a upper material 30 to be welded about in the vertical direction by elevation of each tape guide and the upper electrode 1, the upper electrode 1 is detached from the upper electric conductive tape 32 about in the vertical direction by forces of each spring 62.
OKADA TOSHIYA
SUGIMORI MIKIHIRO
