Large-size thermal color printer

Abstract

The invention discloses a large-size thermal color printer which comprises a stand, medium-placing rollers which are parallelly installed on the stand, a front constant tension assembly, a rear constant tension assembly, a printing mechanism composed of at least three printing assemblies and a ribbon conveying mechanism composed of at least three pairs of ribbon assemblies. By the adoption of the printing mechanism in upper and lower parallelism and through the front constant tension assembly and the rear constant tension assembly, constant-tension and constant-speed conveying of a printing medium can be guaranteed so as to prevent wrinkling and slipping of the printing medium. In addition, through a regulating mechanism for flatness and levelness of a print head, it can be ensured that the print head is stably contacted with the rubber covered rollers, and printing quality is guaranteed. Thus, printing of large-size color photo images is finally realized.

Description

technical field [0001] The invention belongs to the technical field of banner printers, in particular to a large-size photo-grade precision thermal printer. Background technique [0002] At present, most of the photo field is inkjet printing, the printing speed is very low, many inks take a long time to dry after printing, the nozzles are easily blocked, the maintenance of the printer is troublesome, the production efficiency cannot be improved, and the weather resistance is poor. The production process is long and expensive. In the prior art in the thermal field, there are two working principles of thermal printers: one is to use thermal paper, the thermal printing head heats up during the printing process, and the heat is transferred to the thermal paper. Display text and patterns when heated, suitable for postal, fax, retail and other ready-to-use fields, but because the text and patterns on thermal paper are easily faded by the environment and time, the short storage ti...

AI Technical Summary

Problems solved by technology

[0004] However, at present, printing with ribbons cannot accurately print complex color images such as photo images due to precision reasons, and can only be used for printing simple patterns, such as barcode printing, train ticket printing, luggage tag printing, etc.

In addition, for the field of photo images, the printing size is usually large, with a width of 1.5 meters and a length of tens of meters or even longer, which makes the cumulative error of printing larger, so the existing ribbon printers are far from meeting the technical requirements

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