Large opposite-running perfect offset press

Abstract

The invention relates to a large opposite-running perfect offset press, comprising a paper feeding mechanism, a printing rack and a paper collecting mechanism, wherein a tick-mark nearside cylinder, a tick-mark farside cylinder, a front paper transmitting cylinder, a rear paper transmitting cylinder, two transfer printing cylinders, two printing plate cylinders and two ink transferring devices are arranged on the printing rack, the tick-mark nearside cylinder and the tick-mark farside cylinder are jointed, the front paper transmitting cylinder is arranged in front of the tick-mark nearside cylinder, the rear paper transmitting cylinder is arranged behind the tick-mark farside cylinder, the tick-mark nearside cylinder is provided with a transfer printing cylinder I, a printing plate cylinder I and an ink transferring device I, and the tick-mark farside cylinder is provided with a transfer printing cylinder II, a printing plate cylinder II and an ink transferring device II. Paper sheets are transmitted to the tick-mark nearside cylinder through the front paper transmitting cylinder for first printing, then are transmitted to the tick-mark farside cylinder from the tick-mark nearside cylinder for backside printing, and then are introduced into the paper collecting mechanism through the rear paper transmitting cylinder; the paper sheets pass through only four cylinders, so that errors in a transmission process are reduced, the transmission precision is increased, and the probability on ghosting is reduced; and the large opposite-running perfect offset press is compact in structure.

Description

technical field [0001] The invention relates to a large folio double-sided offset printing machine, in particular to a large folio double-sided offset printing machine with compact structure and high printing precision. Background technique [0002] When the traditional double-sided offset printing machine is used for printing, the transfer cylinder and the transfer cylinder are generally used for printing. Since the blanket of the transfer cylinder is soft, it is a soft-pressed structure during printing, which is prone to dot deformation, expansion, Small dots are easy to lose and other phenomena seriously affect the quality of printed products. Patent No. ZL 200620164976.3 discloses a single-color double-sided offset printing machine, which uses two sets of impression cylinders and transfer cylinders to print paper. The printing is a hard-press-soft structure, which solves the shortcomings of easy deformation and expansion. Yes: The paper is passed through several paper t...

AI Technical Summary

Problems solved by technology

[0002] When the traditional double-sided offset printing machine is used for printing, the transfer cylinder and the transfer cylinder are generally used for printing. Since the blanket of the transfer cylinder is soft, it is a soft-pressed structure during printing, which is prone to dot deformation, expansion, Phenomena such as small dots are easy to lose seriously affect the quality of printed products

Patent No. ZL 200620164976.3 discloses a single-color double-sided offset printing machine, which uses two sets of impression cylinders and transfer cylinders to print paper. The printing is a hard-press-soft structure, which solves the shortcomings of easy deformation and expansion. Yes: The paper is passed through several paper transfer rollers during printing, which is easy to cause cumulative errors and ghosting, and the structure is not compact and occupies a large area

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