| 摘要 |
PROBLEM TO BE SOLVED: To improve a durability of guide pins and surrounding parts and consequently improve a durability of an entire impact dot head and stably carry out a high-speed dot impact operation by preventing a plurality of all the guide pins from being out of control in a yoke. SOLUTION: A pin hole 11 having a larger inner diameter than outer dimensions of the guide pin 8 is formed to an armature 6. A rotary spindle is thus formed to rotate for exciting a printing wire 9 with the guide pin 8 inserted. The guide pin 8 is stored in a notch part 12 set to the side yoke 4. A width (a) of the notch part 12 is made larger than a diameter (b) of the guide pin 8. The guide pin 8 is fixed in position and restrained from moving by being pressed into the notch part 12.
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