PURPOSE: To attain printing at high speed and the reduction of noises by using a member formed by joining a yoke section composed of iron silicon and a core section consisting of permendur as the magnetic path of a dot printing drive system.

CONSTITUTION: The magnetic path of a dot printing drive system is made up of a yoke section 2 composed of iron silicon and a core section 1 consisting of permendur, and shaped by joining these yoke section and core section. It is preferable that the components of the core are made up of 40-55% Co, 0.5-2.5% V, 1-3% W and 0.01-0.05% C at weight% and the remainder is composed of Fe substantially at that time. That is, the core section 1, a sectional area of which is limited and magnetic flux density of which is most heightened, in the yoke-core consists of permendur having saturation magnetic flux density higher than iron silicon as the materials of conventional yokes and cores. Accordingly, the increase of magnetic flux and miniaturization are enabled, and printing at high speed and the lowering of noises required for a printing head can be satisfied sufficiently.