Print head and printer equipped with such print head

Abstract

A print head in which print force can be prevented from being reduced by making the distance between the tip of a print wire and a print medium adjustable. A printer equipped with such print head is also provided. When the tip of a wire (11) abrades through use of a print head (1) and print force is reduced due to increase in distance between the print surface of a print sheet (20) and the tip ofthe wire (11), a pull-out spacer (14) is pulled out.Consequently, the distance (L2) between the tip of a tracing roller (12) and the reference surface (16a) of a frame is shortened to a distance (L1-2t), and the distance between the print surface of the print sheet (20) and the reference surface (16a) of the frame, which is equal to the distance (L2), is also shortened. Furthermore, the distance between the tip of the projecting wire (11) and the print surface of the print sheet (20) is shortened to a distance (d1-2t), and the tip of the wire (11) approaches the print surface of the print sheet (20) thus the distance becomes the distance before the wire (11) abrades.

Description

technical field [0001] The present invention relates to a print head for printing on a print medium by striking the tip of a wire, and a printer provided with the print head. Background technique [0002] The dot-matrix impact type printhead is used in printing devices, recording devices, and the like. As such a print head, as shown in Patent Document 1, each includes a plurality of: a print bar that is powered to an excitation coil, is attracted by a magnetic force generated by a magnetic core, and swings to a standby position by a force of a return spring; The printing striker pins are respectively fixed at one end of the printing rod, and are acted by the printing rod to strike the printing surface of the printing paper through the ink ribbon to perform printing. [0003] In addition, as disclosed in Patent Document 2, a roller for securing the distance between the tip of the printing plunger and the printing surface of the printing paper is further provided. [0004] P...

AI Technical Summary

Problems solved by technology

[0007] If the tip of the striker is worn like this, the tip of the striker will not reach the printing surface of the printing paper, resulting in a problem that the printing performance on the printing paper will be reduced, such as white spots in the print.

[0008] In Patent Document 2, on the carriage on which the printing head is mounted, the opening of the supporting part for bolting the roller is extended in the adjustment direction, and by loosening the bolt, the position of the roller relative to the printing surface is adjusted, so that the printing can be adjusted. The distance between the tip of the striker and the printing surface. However, since there is no structure to specify the adjustment amount, the adjustment work is very complicated.

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