Briefly explain the working principle of the needle printer

The pin printer itself is a micro-computer system, the work of the whole machine is controlled by the CPU. Its control program is stored in ROM, so that the CPU can work when it is turned on.

The CPU can receive a variety of control instructions from the panel, as well as instructions from the host computer, and interpret the various instructions for execution. These connections are done through the computer's interface. There are two general ways of working with a needle punch, Text Mode (Text Mode) and Bit Image Print Mode (Bit Image Print Mode).

Expanded Information:

The principle of dot-matrix printing dates back as far as 1925, when German inventor Dr. Rudolf Hell invented it. The German inventor Dr. Rudolf Hell invented Hellschreiber, a method of parsing dot-matrix text facsimiles. 1929 Rudolf Hell filed an application for Hellschreiber. In 1929 Rudolf Hell patented the Hellschreiber. The evolution since then has been dot matrix typewriters and dot matrix facsimile machines that encode letters and send them, or receive a radio and then decode and record the text at the same time.

Dot matrix printers are no longer used in communications, starting with the OKI Wiredot, the first Serial Contact Dot Matrix (SIDM) printer developed by Japan's OKI in 1968, which reaped a large number of orders in government, research, education and other industries to record text messages.

Baidu Encyclopedia - Needle Printer