This article was provided by Zhao Diyi, senior vice president of Zhaodi Printing Machinery Co., Ltd., Zhaodi Printing Machinery Co., Ltd. 1. Mechanical Properties of Offset Press For the paper feeding part of modern high-speed sheetfed multicolor offset presses, it is not only necessary to guarantee high-speed printing. The stability and accuracy of the paper, but also take full account of various factors to adapt to different types and format of the printing materials. Komori's paper feeder uses an eight-nozzle design, which can deliver 0.04~0.8mm thick paper steadily, and the paperboard is still a step-type, equipped with an integral moving paper brush and paper. Wheels, this kind of arrangement also has better adaptability to printing materials that are not very standard or quality is not ideal. In order to ensure the accuracy of paper feeding and prevent paper feed failures and paper waste, Komori adopted a combination of mechanical, photoelectric, and inductive methods to control skew, double-sheet, and empty-sheet feeding processes. Its delivery mechanism did not adopt the popular pendulum type, and it was still the pendulum type. At present, the speed of printers can reach 15,000 sheets/hour, and the delivery of paper is smooth and accurate. There is no argument that the paper is not stable and the printing speed cannot be increased. Moreover, a paper feed (forward paper) roller is omitted, and the commonly used four colors are saved. Printing can be completed with just 8 paper transfers. Of course, there is a further guarantee for printing quality. In addition, the anti-dumping device installed on the swinging feed shaft can compensate for the paper's spread, which is of practical significance to domestic users. The arrangement of printing cylinders is not important, because both the “seven†and “five†arrangements are short and long. From the actual effect, different types of machines have little difference in the printing quality and the operability of the machine. Moreover, there are two layouts in some manufacturers' product lines. The advantages of double-diameter impression cylinders and double-diameter transfer cylinders in ensuring the quality of printing and expanding its adaptability have been confirmed by practice. Komori sheet-fed offset press is also a method of this type. However, the popular air-cushion type guide method is not adopted in the paper guide system. Instead, a roll-fed transfer cylinder with a special cloth for preventing scratching is used to ensure The paper sheet during the transfer process is not scratched or scratched. Komori is currently the only manufacturer that is printing back two ways, namely double-sided printing with double-sided printing and double-sided stencil printing. It is also the only manufacturer of double-sided offset printing that is commercially available. Manufacturers, this model is for the color books and magazines printing market, since 1998 the model has installed more than 40 in the world. From the point of view of manufacturing and user use, the double-sided printing with reversed in the two dual-printing methods has a large number of paper transfers. Accumulation of mechanical wear errors caused by long-term use has an impact on the quality of printed products and it is inconvenient. Maintenance, sub-external, there are special requirements for the quick-drying of the first four colors of ink. The double-sided single-passage double-sided printing method, which is based on one side of paper pick-up, adopts an imprinting method for hand-printing, not only guarantees the consistency of the printing quality on the backside and the accuracy of registration, but also largely solves the problem. The problems faced by the reversal printing, such as smudging, squeezing, front and back printing, etc. In addition, this single-passage method is very adaptable to the non-standard format paper in China. The shaft, tooth structure and material on the transfer paper roller play an important role in ensuring the accuracy of registration, reducing the instability of the ink color, the adaptability of the printing material, and the durability of the printing press. Komori adopted a large-diameter rod. The shaft reinforces the strength, and the gripper pad adjustment device can respond quickly to the thick paper. Among them, the caries are made of carbon steel coated with corundum, which can greatly enhance its durability. The printing part of the ink delivery system is either a long ink path or a short ink arrangement and should be justified. Komori adopts the long ink path method, which provides uniform and uniform ink film for the layout by four reel-backed rollers with different diameters and four ink-reducing rollers. The ink roller is a copper roller with excellent ink transmission performance and good heat dissipation. Easy to clean. The water delivery system adopts a five-roller continuous water supply design with reversed water transfer. Its feature is that it can provide stable, uniform, and minimal amount of fountain solution directly to the layout, and can be used for alcohol-free printing without changing the configuration. The various protective devices adopted by different manufacturers in the delivery section have the purpose of preventing scratches and scratches on the printed products and shortening the time required for the post-printing process. For example, Komori's double-precision offset device and The rewinder (which allows the flat edges of the paper to return to its original position), as well as a double delivery device that automatically separates the problematic sheets. Second, automation control and other modern offset printing, its automated program and printing monitoring capabilities is an important symbol of its advanced nature. For example, the automated job preparation and pre-setting function can quickly and accurately register and color the different printing materials without relying on experience. Among these, there are two ways of diagonal adjustment of the printing plate, which are related to the structure and design of the machine itself, rather than the relevant information. Komori uses an axial deflection of the plate cylinder because Komori's roller bearings are machined and installed with special materials and know-how. They allow ±0.2mm skew adjustment while avoiding the accuracy of the rollers. Cause long-term damage. Sheet-fed multi-color offset printing machines have very high requirements for durability, because any small mechanical or electrical failure will cause interruption of the printing and reduce the production efficiency. Therefore, the ability of overloading work and durability should be paid attention to. Judging from the current situation, the structure and design of offset presses are relatively mature. Common faults occur in the control of electrical appliances, but this was not the case from 8 to 10 years ago. At that time, faults were mostly caused by machinery. Therefore, at present all manufacturers are making great efforts in the stability and reliability of electrical control technology. At the same time, they also apply some technical features and functional configurations of web offset press to a sheet-fed offset press. Komori believes that domestic users of offset presses are more focused on the scope of application of thick and thin paper, stability of offset presses, cost-effectiveness, support for product sales and service, and technological advancement of the product itself.
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