Abstract: A dot printer wherein magnetic ink is fed by magnetic-flux generating means to a slit formed between a pair of magnetic poles, and needles are selectively driven so that tips thereof furnished with the magnetic ink are brought into contact with a recording paper to perform printing with the ink. Since the magnetic ink is fed to the slit only during the operation of the printer, the ink is not present in the slit when no printing operation is being performed, hence preventing occurrence of a trouble that may otherwise be induced by evaporation of the magnetic ink.

Abstract: An ink-dot printer comprises a magnetic ink storage tank storing magnetic ink, a pair of pole plates facing each other so as to define a slit one end portion of which is contacted with the magnetic ink supplied from the magnetic ink storage tank, an electromagnet for magnetizing the pole plates, thereby feeding the magnetic ink from the magnetic ink storage tank into the slit to form a magnetic ink curtain in the slit, and a plurality of needles arranged adjacent to one another along the longitudinal direction of the slit and adapted selectively to move in the longitudinal direction thereof between a first position where one end portion of each needle is immersed in the magnetic ink curtain in the slit and a second position where the one end portion is projected from the magnetic ink curtain in the slit, the cross-sectional area of the one end portion of each needle being made to narrower than that of the remaining portion of the needle so that the distance between the one end portions of any two adjacent nee