course allowable that fuzzy or small projections raised on the inner surface of the slit 16 may touch the printing wires 5 slightly accordingly substantial supply of ink to the printing ends 5a of the printing wires 5 hardly depends on direct contact between the inner surface of the slit 16 and the respective printing wires 5 ink absorbed in the lower end portion 15 is returned into the original liquid state or so called free liquid on the rear surface of the bearing plate 6 by the pressing action of the pressing means 21 the liquid ink moves along the rear surface of the bearing plate 6 to bores 23 which are formed at the bearing plate 6 so as to slidably support the printing ends 5a of the printing wires 5 thus the printing ends 5a are wet with the liquid ink all times in this embodiment the pressing means 21 comprises a pair of protrusions projecting toward the bearing plate 6 in the above described arrangement and functions it is possible to supply the printing ends 5a with the liquid ink uniformly and surely without causing deterioration as well as abrasion in the lower end portion of the capillary path member 14 and with a reduced load onto the actuator.