| 摘要 |
PURPOSE:To rapidly transmit the heat generated from a coil to a temperature-detecting element and prevent the coil from being burned, by disposing a metallic ring between the coils, which are arranged in an annular form, and a yoke in contact with both the outer peripheral surfaces of the coils and the temperature-detecting element. CONSTITUTION:When a coil 1a is brought to a high temperature due to heat generation, the heat of the coil 1a is transmitted to a heat ring 9 disposed in an annular form in contact with the outer periphery of the coil !a, the heat is conducted along the annular shape of the heat ring 9, and is conducted to a temperature-detecting element 8 disposed in contact with the heat ring 9. When the element 8 receiving the heat conducted from the coil 1a through the heat ring 9 reaches a predetermined temperature, a printing-stopping function is performed to stop printing. While the heat generated from the coils 1a, 1b is transmitted to the temperature-detecting element 8 through the heat ring 9, it is transmitted also to an inner peripheral part 2a of a yoke 2 disposed in proximity to the outer periphery of the heat ring 9, and heat conduction proceeds along the annular shape of the inner peripheral part 2a of the yoke 2. Thus, the yoke 2 also contributes to the heat conduction from the coils 1a, 1b to the temperature-detecting element 8, together with the heat ring. |
