Abstract: In a wire dot printer head of the present invention, an armature is formed by coupling a magnetic circuit formation member having a supported piece with one end inserted into a cavity formed on a surface of a yoke to an arm coupled to a wire. The supported piece of the armature is rotatably supported by a support point, thereby a side surface of the cavity and a side surface of the supported piece, and a bottom surface of the cavity and an end surface of the supported piece can be set in the proximity. Accordingly, magnetic resistance between the magnetic circuit formation member and the yoke can be reduced.

Abstract: A microarray printing device includes an elongate holder having a plurality of receiving slots, and printing pins. Each printing pin extends through and is linearly movable in a corresponding receiving slot in the holder, and has head and tip portions. The tip portion has a tapered surface, a tip end face, a plurality of capillary channels that extend axially on the tapered surface from the tip end face, and a plurality of passages formed on the tapered surface for collecting liquid and connected respectively to the channels opposite to the tip end face.