| 摘要 |
PURPOSE:To reduce magnetic interference between print magnets of a print head for a wire dot printer by filling a casting agent containing magnetic agent between plural electromagnetic coils of the head. CONSTITUTION:When a current is caused to flow through a coil 2 of a pring magnet 21a of a print head 21 so that NS poles of a permanent magnet 8 become opposite to poles of a core 1, the core 1 becomes an electromagnet and acts to negate the attractive force of the permanent magnet 8 and an armature 3 is caused to fly to the side of a magnetic route 7a by the energy accumulated by a supporting spring 6 and printing is performed. As power supply to the core 2 is stopped, the electromagnetic force of the core 1 disappears, the armature 3 returns to its stand-by position as it is attracted to the core 1 by the attractive force of the magnet 8. At this time, since magnetic filler material 22 is poured and filled up between print magnets, the amount of magnetic flux affecting on the adjoining electromagnets becomes less. |
