Ink supply tank for a wire dot matrix printer head

摘要

There is provided a dot matrix printer head comprising an ink supply tank containing ink absorbing parts characterised in that the ink absorbing parts have been impregnated with ink at a pressure lower than atmospheric pressure. Pref. the pressures at which the ink is impregnated is in the range 5 to 10 mmHg. The ink supply tank pref. has an air hole which communicates with air in at least one space between the ink absorbing part and an inner wall surface of the ink supply tank. The ink absorbing part may comprise porous members which are in contact with each other so that ink may flow from one to the other. Moreover, the ink supply tank may have an ink supply port which is arranged to receive ink from the second porous member. The first porous part has pores whose average diameter is greater than those of the second porous part.