JPS578170A - Inking mechanism for wire-type dot printer head - Google Patents

Abstract

PURPOSE:To contrive to achieve a ribbonless construction and enhance the density and quality of printed images by a method wherein a plurality of grooves are provided on the surface on the side of a printing end face at a wire tip part, and a part of a supplied ink is recovered in a regulated manner through the grooves so that a suitable amount of the ink is supplied to the printing end face of the wire. CONSTITUTION:When the ink is fed to a feed port 59 through a feed pipe 58 by a pump or the like, the ink impinges upon a wall surface 66 of a passage which is connected to bypaths 61, 62 and a passage 50 for the ink. The main flow of the ink enteres the bypaths 61, 62 while a small pulsating flow having a lowered pressure enteres into the passage 50, and the passage 50 is filled with the ink by, e.g., the attractive force of capillary action generated at a small gap between wire guides 52, 53. Further, the ink is drawn up to the printing end face of the wire 51 by the capillary action of a clearance between the wire 51 and a wire guide hole of the guide 52. A part of the ink is directed into ink regulating and recovering grooves 69 connected with the guide hole, and the suitable amount of the ink is supplied to the printing end face of the wire 51 between the tip part of the wire 51 and the guide hole of the groove 52. An excess ink in the grooves 69 is discharged via a discharge port 60.