Vacuum-sucking paper feeding mechanism for offset press

Abstract

The invention discloses a vacuum-sucking paper feeding mechanism for an offset press. The vacuum-sucking paper feeding mechanism comprises an automatic ascending-descending paper stacking table, paper guide rails, paper distributing claws, blowing pipes, vacuum sucking tube components, movable parts, a paper feeding platform, a vacuum suction pipe and a discharge pipe, wherein air suction and discharge are delivered by a vacuum pump. The automatic ascending-descending paper stacking table is provided with a transmission part which includes a pair of gears, a transmission shaft, chain wheels, chains, guide rails, a paper stacking table and a paper pressing plate, and provided with an electric button and a positioning photoelectric sensor to control operating of the motor, and paper on the paper stacking table is fed to the specified position. Suckers in the vacuum sucking tube components suck paper to the paper feeding platform; the movable parts on two sides are matched with transmission cams so as to support forward and backward moving of the vacuum sucking tube components, the paper feeding platform is provided with a front wheel pressure-flexible-adjustment component and a paper feed belt to convey paper backwards, and front wheels adjust pressure through leaf springs by the aid of adjusting screws. The vacuum-sucking paper feeding mechanism is quick and accurate and has no damage on paper, and clean and clear paper products can be printed smoothly.

Description

technical field [0001] The invention relates to a vacuum suction paper feeding mechanism for an offset printing machine. Background technique [0002] Offset printing machine is a kind of indirect printing principle. Ink and water adhere to the printing plate surface wrapped in the outer circle of the printing plate cylinder through the ink rubber roller balance system, and the paper substrate is rolled by the meshing of the rubber cloth cylinder and the printing plate cylinder. A machine that transfers the graphics and text on the required printing plate to business cards, hang tags, postcards, various cards and other substrates for printing. The offset printing machine is composed of a cylinder, a rubber roller, a main body composed of a side plate, a paper feeding mechanism, and a motor drive control unit. Paper cards (hereinafter referred to as paper) as substrates are stacked on the stacking table, and the paper is placed on the paper feeding table by the paper feeding...

AI Technical Summary

Problems solved by technology

Generally, the speed of batch printing can reach 10,000 sheets per hour. At present, various paper feeding structures are difficult to guarantee the accuracy of high-speed paper feeding. Sometimes the paper is damaged, the paper is not fed properly, or two sheets of paper are fed. It will cause scratches on the printed paper, ink marks on the reverse side or ink marks on the printing surface of different thicknesses, and the cleanliness and clarity of the printed matter cannot be guaranteed.

[0003] At present, the paper feeding mechanisms used in offset printing machines are: 1. The steel pushing mechanism, the steel sheet or the pushing block with convex edge moves the stacking table to the top of the stacking table along the chute The lower paper is pushed to the paper feeding table. Due to the high friction force, the quality requirements of the paper are high, and it is easy to push the paper to damage or push out two sheets of paper.

2. The paper feeding tooth relies on the movement of the slide bar and the reset bar to feed the paper. It is easy to not clamp the paper or there are pinch marks on the paper surface, and the running speed is slow. Different supporting parts need to be replaced for different printing thicknesses, and the operation is cumbersome.

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