| 摘要 |
PURPOSE:To check the generation of leaked magnetic flux by enabling simple and proper adjustment of the amount of flux by means of a small hole for magnetic resistance formed in the sub-magnetic path composing a yoke. CONSTITUTION:When excited, an electromagnet 6 receives an excitation opposite to a permanent magnet 5 and the magnetic flux generated from the permanent magnet 5 is diverged into a suction part 2 and a side current part 7 causing decrease in the flux of the suction part. Consequently, an armature 4 is released by force of a spring 1 and a printing wire 9 impacts on the surface of the recording paper so as to effect printing. In an apparatus of such a type, a small hole 10 for magnetic resistance is provided on the side current part of a yoke 3 for example at the angle of flux flowing to the section. With such an arrangement, the amount of flux flowing through the main and submagnetic paths can be adjusted simply and properly. This checks the generation of leaked magnetic flux eliminating adverse effect on the adjacent head thereby stabilizing actions. |
