It can be applied to the printing of a variety of printing materials. Heidelberg offset presses generally use step belt type standard paper feed (for start-up) or vacuum suction belt type paper feed (four open and eight start). The paper feeder has a stable structure. The suction belt type paper conveying makes the operation and adjustment convenient and quick; the paper table is raised in a stepless manner, which can change the rising height according to the actual thickness of the paper, so that the relative position of the suction nozzle and the pile of paper is kept stable; The teeth can ensure the simple delivery mechanism and easy adjustment; the cylinder arrangement uses the "seven o'clock" method for printing machines that use double-diameter impression cylinders, which can meet the cylinder arrangement requirements, facilitate paper transfer, and help improve the printing quality. It is especially suitable for the printing of thick cardboard-type printing materials; the inking system uses 21 ink rollers arranged to meet the principle of "front weight and light weight" inking, and can realize rapid reaction of ink flow; the dampening system is composed of 5 water rollers The water fountain roller and the ink fountain roller are treated like a partition, and a row of axially adjustable blowers is used to evaporate the excess fountain solution. The dampening device has an automatic speed compensation function, which can achieve fast water-ink balance and ensure stable water supply when the printing speed is changed; the paper collecting device adopts a blown paper guide stack, and the double-increasing powder spray device can make the paper stack stable and tidy, and can save 30 % Of powder sprayed.

Heidelberg is also making efforts to enhance the automation control capabilities of printing presses. From CPC ink remote control and registration system, CPPONIC printing press integrated control system to CP2000 printing press automatic control system, in addition. Realized automatic monitoring and control of printing quality. By configuring a fully digital electronic display system, it is also possible to achieve integrated operation and management, which can achieve better product quality, shorter print preparation time, less press maintenance, and higher print output.

2. Technology of Manroland Sheetfed Offset Press

Stable and accurate paper conveying; double-diameter impression cylinder, Roland 700 standard printing machine adopts hem-type front gauge and hem-type paper delivery teeth. Reduces the number of paper transfers between multi-color units, greatly reduces paper transfer errors, and smoothes the surface of the printed product, reducing dot deformation during imprinting; the use of "seven o'clock" cylinder arrangement allows the printed paper to pass through the rubber completely It is transferred to the transfer cylinder after the roller is imprinted, reducing the dot changes and overprinting problems caused by the paper transfer during the printing of the tail of the printed sheet; the ink supply system uses a fast-response ink path system with only 16 ink rollers to supply ink The method adopts the central ink feeding method, and has the functions of "automatic grading adjustment" and "automatic separation of ink chain" of the main ink channeling roller. It has the characteristics of large diameter of the ink roller, good heat dissipation performance, and is suitable for high-speed printing; the wetting system uses RolandDeltanmat Triangle-type wine-clearing version system has a good effect on eliminating "ghost images" and reducing "white spots"; the use of a "line-shaped" paper transfer device without a barrel body can prevent contact and smudging of printed sheets, and there is no need to add Equipped with anti-scratch mesh, the operation is very convenient, which is helpful to reduce the loss of printed products; the diagonal registration of the printing plate can be automatically adjusted by the eccentricity of the paper conveyor. It will be adjusted by an eccentric plate cylinder, thereby reducing the waste through the paper version, to overcome the bias due to the parallelism of the plate cylinder and the blanket cylinder eccentric adjustment of the rollers against the inking generated.

It is a major feature of manroland printing presses to use vacuum conveying paperboard, and to use a large number of pneumatic control systems to replace radical mechanical devices. The variable-speed suction belt and pneumatic side pull gauge greatly reduce the complicated mechanical structure, and reduce the difficulty of mechanical manufacturing, installation and commissioning. The left and right positions of the paper stack and the closed position of the paper feeder can be accurately controlled by the position switch, thus ensuring the accurate registration position of the double-sided printing. In order to improve the automation level of single-sheet multi-color offset presses, improve printing quality, and reduce labor intensity, Manroland adopts the PECOM control system, which can be used for electronic printing control and presetting. Enter the data of the paper web and paper thickness into the console when preparing for the prepress operation, and then you can automatically and accurately complete the front and back position of the feeder's feeder head, front regulation, side regulation, vacuum suction wheel, powder spraying device and printing Precise and quick pre-adjustment of pressure, etc., reduces preparation and downtime, and improves production efficiency. Manroland not only makes progress from time to time in the development of radical offset printing equipment, but also has some accomplishments in digital printing. From its independently developed DICOWeb web digital offset press, it can be seen that manroland combines aggressive offset printing technology with modern digital printing. The combination of ground and ground has opened up a new path for the development of offset printing technology.

3. Technology of KBA Sheetfed Offset Press

In addition to the currently popular hem-type paper transfer, hem-type front gauge, double-diameter impression cylinder, air-cushion paper transfer, automatic centering of the paper table, and pneumatic paper delivery device, KBA105 has a very high printing speed of 21,000 sheets / hour design speed. It also created the "four-lift six-feed" paper feeder, which can be electrically adjusted for blowing and suction nozzles, making the adjustment faster and more convenient, and the paper feeding is more stable and accurate. The vacuum paper feeding can realize four-stage variable speed paper transfer. One air cavity can ensure that the suction pressure is close to the end of the paper feeding table, and the air pressure at the end near the front gauge is zero, which realizes the speed change required for paper transfer; the pneumatic side pull gauge can achieve precise positioning, and the photoelectric control can not pull the paper in place. ; Ultrasonic double-sheet detection device is very beneficial for thick paper, special printing materials and thick ink products; Inking device is a single ink path inking system using 5 different diameter plate rollers, the ink roller can be pumped towards , Used to eliminate the "ghost" ink rollers with a small number (15) and a large diameter, which can realize rapid change of printing ink color, reducing paper waste and cleaning time; the wetting device adopts linear water transfer, which can be applied to ordinary wetting at the same time Wetting with alcohol; the paper transfer and impression cylinder adopts "anchor claw" teething, which can save the work of adjusting the tooth arrangement when the thick and thin paper is converted during the printing process; , Plate box) or automatic plate-feeding (with plate-feeding box) reduces downtime assistance time and improves production efficiency; the use of a transfer cylinder allows diagonal registration adjustment without the need to shift the plate cylinder on one side. Ensure the running accuracy of the printing press.

Improve running accuracy and ensure printing quality, in order to increase the stability of machine operation. KBA105 also adopts the integral casting of the lower fuselage and the T-shaped wall panel installation method, which not only reduces the vibration of the machine, but also solves the problem of lubricant leakage.

4. Technology of Komori Sheetfed Offset Press

It can realize the stable conveyance of paper with a thickness of 0.04mm-0.8mm; it adopts mechanical, photoelectric and inductive double-sheet and empty-sheet detection devices, and the paper feeding device of Komori printing machine adopts the design of eight nozzles. It can control printing errors such as skew, double sheets and empty sheets in the paper feeding process to ensure that the paper is conveyed accurately; the paper delivery mechanism is equipped with an anti-scattering tail device on the swinging paper delivery shaft to compensate for the paper tail; the same double Double-diameter impression cylinder and double-diameter paper transfer cylinder can meet the requirements of printing materials and printing quality; the tooth axis on the transfer paper cylinder adopts a large-diameter torsion bar tooth axis, which can increase its strength, improve safety and stability ， Paper tooth pad adjusting device can quickly respond to thick and thin paper, reducing the time of machine adjustment; due to the use of special plus harsh roller bearings with deflection of ± 0.2mm, the diagonal registration of the printing plate can be adjusted by printing The axial deflection of the plate cylinder is achieved; the inking system uses a long ink path, relying on four platen rollers of different diameters and four ink channeling rollers to ensure uniform ink color of the printing plate; The continuous water supply method of the roller can directly provide a stable and uniform fountain solution to the layout; the paper collection adopts an anti-printing deflection device, and is also equipped with a double paper collection device that can automatically separate the problematic printing sheets.

5. Technology of Mitsubishi Sheetfed Offset Press

The printing speed of its 3F series offset press is 13,000 sheets / hour. Mitsubishi sheet-fed offset press mainly includes F series, H series and diamond series. The maximum printing speed of 3H series and Diamond 3000 series offset presses can reach 16000 sheets / hour.

The Feida device uses simulation design technology, Mitsubishi Diamond (DIAMOND3000 series offset press. In addition to the widely used double-diameter impression cylinder, seven o'clock "cylinder arrangement and automatic and semi-automatic edition, and optimized design, you can Achieve a smooth paper separation of 4.5 sheets / second within various specified sizes; adopt vacuum variable speed paper feeding and vacuum paper feed adjustment to achieve stable paper feed and accurate handover; use new ink keys to reduce the ink and ink fountain keys Contact to make it responsive and easy to clean; the ink flow shaking stop mechanism can ensure that the ink flow stops when the machine is idling, reducing waste sheets and mechanism wear during recovery printing; the use of the ink roller temperature control system can make the ink roller surface The temperature remains unchanged, reducing the ink color deviation of the printed product and stabilizing the printing quality; the wetting system can perform triple transformation to reduce the ink color deviation of the printing product and stabilizing the printing quality; the wetting system can perform the triple transformation to adapt to various printing patterns. Wetting method; the double-narrowing structure is adopted for turning the teeth of the turning drum, which can ensure high-precision paper turning and turning; the paper receiving device adopts two thicknesses Vacuum deceleration paper take-up roller and paper take-up pneumatic chamber ensure that the printed sheets of various specifications can be collected stably, reducing scratches and smudging.

Mitsubishi has developed the MAX-net system in order to establish a digital workflow from pre-press system to post-press processing system. Not only can it have the control function of the printing machine, but also can be networked with the factory and the office at a long distance, so as to keep track of the operation status of the printing equipment at any time, find the printing failure in time and quickly guide the maintenance.