Abstract: A minute work piece in various mechanical or electric component parts is securely brazed by shooting a thin gas flame toward the work piece at a pinpoint while supplying a thread of soldering metal straight to the work piece to heat the work piece and melt the soldering metal, thereby to braze the soldering metal to the work piece. The pinpoint brazing method and device makes it possible to form reliable connection between the conductive terminal of a relay coil and a lead wire wound on a coil bobbin through a sphere-shaped soldering metal. The relay coil thus produced by the brazing method is suitably applicable to various kinds of machinery bringing about vibration, such as automobiles.

Abstract: A device for controlling the operation of an injection molder is disclosed. A fall detection signal is produced when a product falls from the mold. If the full detection signal is generated before the lapse of a fixed time preset in a timer from the instant of appearance of a mold-opening signal from a mold-opening signal generator, the next molding cycle is started. If no fall detection signal is generated within the preset time of the timer, an alarm is generated.