Abstract: A thermocouple sensor is fitted to an iron tip of an electric soldering iron provided with a temperature controller. The sensor can detect the temperature of the iron tip and supply it to the temperature controller, which then adjusts the temperature to a desired value. The thermocouple sensor is formed of a pair of non-covered sensor wires. A contact point part of the thermocouple sensor is secured to a nose of the iron tip. The wires are laid along the surface of the nose in the rearward direction and introduced into a hollow portion through a lead-in hole opened in the vicinity of the boundary between the nose and a columnar base of the iron tip. Then, the wires are inserted into and through a pair of guide holes, respectively, formed in a cylindrical insulating support of a heater. The distal ends of the wires are coupled to a socket, which is an end portion for receiving a signal representing the detected temperature of the iron tip to supply it to the temperature controller.

Abstract: A contact point of a thermocouple sensor is welded to the nose of an iron tip of an electric soldering iron, and sensor wires of the sensor are laid along the surface of the iron tip through a groove to a columnar base of the iron tip. The columnar base of the iron tip is covered, together with the sensor wires situated on its outer surface, with a heater cover. A heater is fitted in an axial bore in the base of the iron tip. The temperature of the iron tip is directly detected by the thermocouple sensor, and on the basis of the detection and a reference temperature, an arithmetic processing is carried out by a signal processor of the temperature controller. Such arithmetic processing is used by the temperature controller to control the electric power supplied to the heater to cause the temperature of the iron tip to coincide with the reference temperature.