Plane surface printing roller of needle printer

Abstract

The invention discloses a plane surface printing roller of a needle printer, which comprises a bracket, wherein both ends of the bracket along the length direction are connected with a support shaft for mounting and fixing the bracket on the fame of the printer, and an irregular mounting surface is arranged at the tail end of the support shaft; the top of the bracket is provided with a neck part; a flexible glue layer is injected on the neck body; the middle surface of the flexible glue layer is a horizontal surface, and both side surfaces of the flexible glue layer are inclined surfaces. The plane surface printing roller and the frame are convenient and accurate to install and locate; the flexible glue layer is not easy to drop off from the bracket, and the middle surface is the horizontal surface, so that the distances between printing work surfaces and a printing head are the same, the uniformity of ink printed on paper by the printing head is ensured, and the printing quality is improved; moreover, relatively thin thickness of the flexible glue layer can be ensured through the structure, so that only few changes of the printer in a gap between the printing work surfaces and the printing head in a specified temperature range are ensured, and the printing quality under extreme temperature condition can be efficiently improved.

Description

technical field [0001] The invention relates to a plane printing roller of a dot matrix printer. Background technique [0002] For dot matrix printers, a printing roller is usually arranged directly below the printing head, and the printing needle of the printing head falls and hits the printing roller to print ink on the paper. The printing roller in the traditional technology includes a central circular shaft fixed on the printer frame. The central circular shaft is glued and bonded with a full circle of rubber layer. The thickness of the rubber layer generally reaches more than 5mm. During the working process of the printer, the printing The roller is rotating, and the top surface of the printing roller, that is, the printing surface is the circumferential surface of the rubber layer, which makes the distance between the printing surface and the print head unequal, presenting a state of being near the middle and far on both sides, making the printing The ink marks printe...

AI Technical Summary

Problems solved by technology

The printing roller in the traditional technology includes a central circular shaft fixed on the printer frame. The central circular shaft is glued and bonded with a full circle of rubber layer. The thickness of the rubber layer generally reaches more than 5mm. During the working process of the printer, the printing The roller is rotating, and the top surface of the printing roller, that is, the printing surface is the circumferential surface of the rubber layer, which makes the distance between the printing surface and the print head unequal, presenting a state of being near the middle and far on both sides, making the printing The ink marks printed on the paper by the printing head are uneven, which affects the printing quality to a certain extent; in addition, because the rubber layer is glued in a circle and bonded to the central shaft, the overall quality of the printing roller is heavy and wastes raw materials; at the same time , the thickness of the rubber layer is relatively thick. During the working process of the printer, due to the effect of thermal expansion and cold contraction, the distance between the printing surface and the print head changes due to temperature changes, especially at extreme temperatures, which may affect the printing of the printer. quality

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