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Lithographic offset presses, except for round press proofers, are all circular presses, but there are many types. There are manual feeds and automatic feeds; there are single-sided presses and double-sided presses. Printed; Monochromatic, but also multi-color; There are sheets of paper printed, but also a web printing; There are full-open, open, and four open; In addition, some lithographic offset The machine is also equipped with a drying device and a folding device.
No matter what kind of lithographic offset printing press, as shown in Figure 9-4, it consists of five parts: feed mechanism, ink supply mechanism, wetting mechanism, and delivery mechanism.
(1) Paper feeding mechanism. Consisting of paper storage and paper feeders.
(2) Printing organization. Including plate cylinder, blanket cylinder, impression cylinder.
(3) Ink supply mechanism. It consists of ink fountain, ink adjustment screw, ink output adjustment plate, ink fountain roller, ink transfer roller, ink distribution roller, ink string roller and reel roller.
(4) Wetting mechanism. Including water bucket, fountain roller, water transfer roller, uniform roller, water roller and so on.
Indirect structures are now used, that is, through a medium - rubber roller transfer printing graphics obtained. Therefore, lithographic printing presses are often referred to as offset printing presses.