Digital printing roller

Abstract

The invention relates to a digital printing roller which is characterized in that a gripper mechanism adopts a gripping tooth and vacuum nozzle combined structure; a plurality of gripping teeth extending in the axial direction of the roller are mounted at the front end of the roller and are used for occluding the front end of paper; a plurality of vacuum nozzles extending in the axial direction of the roller are arranged at the tail part of the roller and are used for adsorbing the tail end of paper; and the roller adopts an axial and circumferential breadth adjustable structure. As to the paper, the printing roller receives paper from a paper transmitting roller through the gripping teeth, when the tail end of paper passes through a joint point, the nozzles at the tail part of the roller adsorb paper, and then an automatic paper tail end spreading mechanism is used for controlling the vacuum nozzles to rotate to enable air suction surfaces of the vacuum nozzles to deflect towards two sides to flatten paper, so as to ensure the flatness of paper in the ink jet process; the roller can be adjusted axially through controlling the opening / closing quantity of the vacuum nozzles according to the size of paper breadth; a breadth adjusting block and a roller body are matched to realize circumferential breadth adjustment, so that the adjustment is convenient and quick; and the roller does not need to be dismantled and replaced, so that the use cost is reduced.

Description

technical field [0001] The invention relates to a digital printing cylinder, in particular to a self-adsorption flattening digital printing cylinder with adjustable width. Background technique [0002] Printing is a process technology that uses printing plates or other methods to transfer the graphic information on the original manuscript to the substrate. There are many forms of printing: traditional offset printing, screen printing, digital printing, etc. Inkjet printing is a kind of digital printing. Part or all of the printed materials such as labels, electronic supervision codes, bills, and various special requirements for anti-counterfeiting occasions must be printed by inkjet. There are usually two ways. One is to use digital inkjet printing. ink printing machine to complete the printing of all the content required by the printed matter, its use cost is high, it is not conducive to mass production of printed matter, and the scope of application is small; the tradition...

AI Technical Summary

Problems solved by technology

Inkjet printing is a kind of digital printing. Part or all of the printed materials such as labels, electronic supervision codes, bills, and various special requirements for anti-counterfeiting occasions must be printed by inkjet. There are usually two ways. One is to use digital inkjet printing. ink printing machine to complete the printing of all the content required by the printed matter, its use cost is high, it is not conducive to mass production of printed matter, and the scope of application is small; the traditional offset printing machine can also be used for off-line inkjet, that is, the printed matter is printed in the printing process. After the printing of ordinary content on the machine, the inkjet printing of the inkjet part needs to be carried out on the machine again. The disadvantages are: low efficiency, easy to produce waste products, and increase labor costs and management costs.

However, it has certain disadvantages: if the end of the paper is wrinkled, the paper cannot be flattened, which directly affects the printing quality; and when adjusting the format, it is necessary to replace the printing plate cylinder. Adjustment is inconvenient, and increases resource consumption and cost input

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