11. Sheet-fed offset printing machine The difficulty of double-sided glazing on double-sided offset presses is that the first side must be sufficiently dry after glazing. In addition to UV printing and drying can be carried out immediately, water-based glazing is mainly due to insufficient drying time. Komori recently introduced the installation of two sets of processing units after the first glazing unit. The processing units do not have plate cylinders and rubber cylinders, only impression cylinders. This will allow the paper sufficient drying time before turning over. The advantages are: (1) there is sufficient drying time to ensure drying after glazing; (2) it is beneficial to the heat generated by drying; (3) the drying ability is improved. In order to cope with the changes of water and UV glazing, add Equipped with UV curing device to adapt to different printing and glazing requirements for drying, improve the use of the machine; (4) improve the printing quality and production efficiency, the waste rate is very low. 12. Online slitting In order to avoid the printing of medium and small-format printed products on large-format offset presses before slitting, Manroland and KBA each launched online slitting devices. The on-line slitting device is generally installed on the impression cylinder of the last unit. The slitting device consists of a slitting knife and a steel belt on the impression cylinder. The cut paper is collected and sent out in two piles. Manroland's online slitting device is shown in Figure 8 and has its own drive components. KBA's online slitting device, the pressure of the cutting knife against the impression cylinder is controlled by air pressure. On-line slitting is suitable for small or medium quantity of live parts and the paper weight is below 450g / m2, which is helpful to reduce the wear of slitting knife and steel belt. It is more cost-effective to use offline paper cutter for cutting when the printing volume is large and continuous operation. Figure 8 Manroland online slitting mechanism 13. Single-sided double-sided multi-color offset printing machine without flipping mechanism The earliest sheet-fed double-sided printing machine was a double-sided printing with a reversing mechanism, printing one side first, and reversing the paper for the other side printing. This type of machine has a complicated structure and strict requirements on the paper length. Because there are two grippers, the paper length needs to be increased. In recent years, special-purpose sheet-fed double-sided printing machines have developed rapidly. There are currently 350 sets of sheet-fed double-sided printing in Japan, including 200 sets of dedicated sheet-fed double-sided printing and 150 sets with a flip mechanism. There are two types of single-sheet double-sided multi-color offset presses without flipping mechanism: BB type and impression cylinder. Its main feature is that the gripper of the printing process is always the same, the machine structure is simpler than the model with the flip mechanism, and the adjustment and maintenance are more convenient. 14. Online printing quality detection device In order to fully test all print quality and ensure that the products delivered to users will not have quality problems, many printer manufacturers such as KBA, Manroland, Komori have launched their own online print quality detection devices. Figures 9 and 10 are examples of on-line printing quality inspection of sheet-fed offset printing presses. KBA's online printing quality detection device is installed in front of the take-up cylinder (as shown in Figure 10), which can detect the printed sheets and the printed sheets after glazing. If the detected printed sheet is different from the standard sample sheet, the error message on the printed sheet will be displayed on the display of the console. Manroland has launched the Eagle Eye Connected Inspection System on Roland700 sheet-fed offset printing press to check all printed products online, and the inspection results can be backed up. Figure 9 Double delivery device and image detection device Figure 10 Print quality online inspection [next] 15. Connect numbers, emboss and punch holes In the printing of various bills, it is often necessary to type numbers. Previously, these jobs were carried out separately on special machines after printing, and now they can be connected for processing. The connection process can be completed by a numbering and embossing unit after the printing unit, or a simple numbering and embossing device can be installed on the printing unit (see Figure 11). As can be seen from Figure 11a, the numbering system consists of the ink supply unit, the shaft of the coding box, and so on. The simple ink supply unit injects the code box, the number on the code box is printed on the paper at the impression cylinder, the code box can be automatically loaded, so the printed matter can be automatically printed with different numbers. As can be seen in Figure 11b, the numbers are installed in different directions, and vertical or horizontal numbers can be printed on the printed sheet. Remove the number box and install a embossed block in its place to emboss the printed matter. Fig. 12 is a punching device arranged on a sheet-fed offset printing machine. To punch, cut, dent, and emboss in the longitudinal direction (printing paper direction), install the corresponding tool (such as a punching knife) on a bracket, as shown in Figure 12a. The bracket is installed in the position to be processed (transversely adjustable), as shown in FIG. 11a. Figure 12b shows an example of a method for installing tools for drilling, cutting, creasing, and embossing in the lateral direction, and related processing tools are installed on a support shaft. Whether it is vertical or horizontal punching, cutting, indentation and embossing, it is all squeezed by related tools and impression cylinders. Figure 11 Numbering device Figure 12 Punching tool 16. Wire die cutting and indentation Previously, only web offset presses were equipped with die-cutting indentation. The web die-cutting of web offset press is generally equipped with a separate die-cutting unit, which can be flat flat die cutting or round pressure round die cutting. In recent years, die-cutting and creasing devices have also been installed on sheet-fed offset printing machines. Figure 13 shows that a special metal plate is installed on the rubber cylinder (or impression cylinder) and squeezed with the impression cylinder (or rubber cylinder) to complete the punching, die cutting, indentation and embossing of the printed matter . Since the relevant processing tools are directly made on the metal plate, the above-mentioned processing can be completed at once in either longitudinal or horizontal directions. Figure 13 Perforated plate on the rubber roller Whether it is punching, die cutting, indentation, embossing, it is necessary to take protective measures on the surface of the impression cylinder (or rubber cylinder). Use the lining (or sheath) for necessary protection, as shown in Figure 13, there is a protective foil on the impression cylinder. 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