| 摘要 |
PURPOSE:To obtain the small size printer had of a high speed at a low cost, by a method wherein the part surrounded at a distance by a coil at a position inward in the radial direction of the yoke existing in the plane normal to the arranging direction of a magnetic circuit, is composed of permendur. CONSTITUTION:Permendur of 50% in Co, 48% in Fe, and 2%in V is used for plural number of the inside leg parts 8 arranged at an interval in the peripheral direction. When a coil 11 is in a demagnetized state, a printing wire 2 is magnetically attracted to the crest of the inside leg part 8 against the spring force of a plate spring 14 by the magnetic force of a permanent magnet piece 4 generated in the gap between an armature 6 and a yoke 3, and separated from the ribbon 18 of a platen 17. When the coil 11 is magnetically excited, the magnetic pass which is able to demagnetize the magnetic force caused by the permanent magnet piece 4 is formed and the armature 6 is energized with the spring force of the plate spring 14. Then, a printing wire 2 strikes the ribbon 18 on a platen 17 to print the recording paper 19 on the platen 17. |
