| 摘要 |
PURPOSE:To achieve the long life of wire dot printing head, by coating molybdenum disulfide powder on one side surface of abrasion resistant sheet on an armature side. CONSTITUTION:The magnetic flux of a permanent magnet 21 is bent when the plate spring 32 fixed with an armature 18 is attracted to a core 17. When the reverse directional magnetic flux is generated by selectively exciting the coil 23 of electromagnet, the armature 18 is released from the core 17. The armature 18 fixed to one end of the plate spring 32 clockwise pivots utilizing the corner of fulcrum block 28 provided at the corner of the core 17 as a pivot fulcrum and the printing wire 29 fixed to the armature 18 is driven by this pivoting operation. Molybdenum disulfide powder 19 coated on the surface 16a of abrasion resistant sheet 16 works as lubricant and at the same time, prevents the abrasion resistant sheet 16 from abrasion. |
