Set-off prevention device of printing machine

Abstract

The invention belongs to the technical field of ink printing equipment and relates to a set-off prevention device of a printing machine. The set-off prevention device comprises a shaft. A paper guideroller is supported on the shaft through bearings, the axial inner ends of the bearings are limited through inner boss shaft shoulders of the paper guide roller, the axial outer ends of the bearings are axially positioned through positioning clamping sleeves, the surface of the paper guide roller is evenly wound with filing skin in a spiral mode, the filing skin extends along the surface of the paper guide roller from one axial end to the other axial end, and each of the axial two ends of the shaft is connected with a support. The set-off prevention device is improved in pertinence to the faults of existing products of the same kind, by arranging the filing skin on the paper guide roller, it can be ensured that the surface stability is high, high duration and abrasion are achieved, skidding is not likely to occur, the set-off phenomenon and scratching marks are prevented, it is ensured that the print quality is not influenced, and the set-off prevention device is a necessary printing material of printing houses; and meanwhile, the set-off prevention device is compact in structure, reasonable in design, high in practicability and low in implementation cost.

Description

technical field [0001] The invention belongs to the technical field of ink printing equipment, and relates to an anti-smudge device for a printing machine. Background technique [0002] In offset printing production, due to the high-speed operation of the machine, the ink on the printed sheet passing the guide roller is not dry, and it is easy to cause smudges. The next printed sheet is stacked on it, and the ink of the previous printed sheet may be partially transferred to the next printed sheet. back, resulting in backside smudging. Dirt on the back will not only cause ink to stick to the back of the printed product, but also cause mottled graphics on the front, seriously affecting product quality, and even lead to the scrapping of the entire batch of products, especially in the dark parts of printed color products and spot colors. When printing on a large area, due to the thick ink layer, smearing on the back is a very easy failure. In addition, during the printing proc...

AI Technical Summary

Problems solved by technology

However, for those prints with poor ink absorption and thin paper, there will still be smudges

Moreover, when printing, due to the change of the paper size, ink accumulation will easily occur on the edge of the anti-smudge after a long time, and it is easy to change the surface characteristics during cleaning to cause paper smear

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