| 摘要 |
PURPOSE:To prevent errors from being generated in assembled dimensions after a heat treatment by a construction wherein a yoke and a nose serving gas a guide part for aligning needles are formed respectively of materials which have approximately equal coefficients of thermal expansion. CONSTITUTION:A second yoke 2 is connected to an opening surface of a U-shaped first yoke 1. A permanent magnet 3 is disposed along an inner bottom surface of the yoke 1, and a magnetic coil 7 is fitted on each of cores 6 fixed to the magnet 3. Each of armatures 8 opposed respectively to the cores 6 is provided with a thin arm 9 at the tip thereof, and a needle 10 is fixed to the tip of the arm 9. A nose 12 serving as a guide part for aligning the needles 10 has a needle guide 11 for slidably supporting the needles 10. The yoke 2 and the nose 12 are formed respectively of materials which have approximately equal coefficients of thermal expansion. The nose 12 is formed from an iron- based material by sintering or the like. The nose 12 is fixed to the yoke 2 by screws 29 made of an iron-based material. |
