Offsetpress

Abstract

The invention discloses an offsetpress, and relates to the field of pressing equipment. According to the technical scheme, the offset press comprises a machine frame and a rubber roller. An ink scraping mechanism fixed to the machine frame abuts against the rubber roller. The ink scraping mechanism comprises a scraping tool assembly arranged in the generatrix direction of the rubber roller and abutting against the rubber roller, and an ink collecting groove connected to the bottom end of the scraping tool assembly. The scraping tool assembly comprises a fixedly connected scraping tool and an arc covering plate arranged close to the upper portion of one end of the rubber roller. The rotary tangential direction of the contact line between the scraping tool and the rubber roller and the bladeface of the scraping tool form an acute angle and are arranged inclined downwards. An ink inlet is formed between the covering plate and the scraping tool. The scraping tool assembly is provided witha flat channel used for communicating the ink inlet and the ink collecting groove. An air pump is connected with the position, corresponding to the exit of the flat channel, of the scraping tool assembly above the opening of the ink collecting groove. The offsetpress solves the problem of an existing offset press of subsequent printing stack caused by residual ink on the rubber cylinder surface,and printing clarity improvement is facilitated.

Description

technical field [0001] The invention relates to the field of printing equipment, more specifically, it relates to an offset printing machine. Background technique [0002] Offset printing press (offset printing press) is a kind of lithographic printing machine. When printing, the printed image is first printed from the printing plate to the rubber cylinder, and then transferred to the paper by the rubber cylinder. Offset printing machines can be divided into sheet-fed offset printing machines and web offset printing machines according to different feeding methods; according to the number of printing colors completed in one pass, they can be divided into single-color, two-color, four-color and multi-color printing machines. [0003] The prior art refers to the Chinese invention patent whose authorized notification number is CN1111477C, which discloses a color offset printing machine with a paper feeding mechanism, including a printing plate cylinder, a rubber cylinder, an imp...

AI Technical Summary

Problems solved by technology

However, this invention has the following disadvantages: after the blanket cylinder is printed on paper, a small amount of ink will remain on the surface of the blanket cylinder, which will cause ghosting in subsequent paper printing and affect the printing clarity

However, this utility model has the following disadvantages: after the rubber cylinder is printed on the paper, a small amount of ink will remain on the surface of the rubber cylinder, which will cause ghosting in subsequent paper printing and affect the printing clarity

However, this invention has the following disadvantages: when the non-woven fabric and the rubber cylinder move relatively and remove the impurities of the rubber cylinder, the impurities may fall on the paper under the action of gravity, which will adversely affect the printing pattern and reduce the printing quality

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