PURPOSE: To stably supply ink from the tip of a needle by agitating the ink in a reservoir and a reservoir guide for each drive of the needle, by installing an agitation claw on that part of needle in the reservoir and the reservoir guide.

CONSTITUTION: When an electric signal is transmitted to an electromagnetic coil 6, it is magnetized and the piston 3 situated at the end in the electromagnetic oil 6 is attracted by magnetism. A return spring 14 is held down and at the same time, the needle 1 fixed by a screw to the piston 3 is moved to the lower limit position. At that time, the agitation claw 16 fixed to the needle 1 situated in a reservoir guide 7 agitates the ink in the reservoir guide 7. When the electric signal to the electromagnetic coil 6 is interrupted, electromagnetic oil 6 is deeneigized and the needle 1 returns to the upper limit end by the restoring force of the return spring 14 having been pushed down with the piston 3. At that time also, the agitation claw 16 agitates the ink in the reservoir guide 7.