Generally, a printing machine is a mechanical device that transfers ink to a print medium. This process is commonly used for printing posters, books, and stationery. Various types of machines are available, and each one is designed for different purposes.
The first printing machine was invented in the 3rd century. It was used for printing texts in the Tang Dynasty of China. Today, printing machines are mainly used in the commercial printing industry. These machines are used for large-scale, high-speed, and heavy-duty printing.
Several printing technologies are now available, and most printers have presses that are equipped with computers and sophisticated instruments. The process of printing is much easier with these machines.
In an offset press, a sheet of paper is passed through a roller to transfer ink. The inked image is transferred to a rubber blanket. The paper is then force dried. The press can print two or four colors at a time. Offset printing is still used for high-volume advertising print campaigns. It is also used for high-volume print production of wallpaper, greeting cards, and gift wraps.
An offset printing press can be web-fed or sheet-fed. Depending on the size of the printing job, a large or small print run is needed. In a large shop, assistants help load the press. In a small shop, the operator must clean and maintain the press. In addition, he must adjust the tension and feed controls for the press. He should also ensure that the plates are level in the press.