Large-character inkjet printers are widely used in the printing of batch numbers, production dates, expiration dates and bar codes on food packaging due to their large printing characters. In general, large-character inkjet printers can print characters with a height of 18mm-64mm, but the SX32-8000 series of multifunctional inkjet printers developed by Konova Matthews, which is famous for large-character inkjet printers, has achieved new breakthroughs in character height. Using the unique nozzle rotation technology, the character height can be adjusted at will from 5mm to 128mm, thereby expanding the printing range from large characters to small characters and high-resolution inkjet printers. The advantage of this multi-function is that the same type of inkjet printer can be installed on the same production line according to the characteristics of users, and the information printing of small characters and large characters can be completed at the same time. With the development of enterprises, more and more information requirements are required for printing on outer packaging. In addition to factory information and batches, there are also bar codes and patent numbers, which require inkjet printers to print multiple lines of characters at a time. SX32-8000 series inkjet printers can not only print large and small characters, but also provide a single nozzle with 32 nozzles to achieve up to 5 lines of printing, while general large character inkjet printers can only print one or two lines of information respectively. In the production process of the product, the coding is only a small part. However, due to the high failure rate of the coding machine and the need for more manual maintenance, it often becomes a big trouble in the production process. Therefore, the stability of operation is a very critical element of the inkjet printer. As the latest model of Konova Mathews in 2009, the KN2120/2130 printer has achieved remarkable stability and reliability on the basis of integrating the latest international coding technology. Its nozzles are automatically cleaned, and the whole machine is automatically discharged and cleaned; one-key switch control can realize multiple automatic detection fault early warning and alarm functions in an instant; it can meet the long-term continuous work of various production and processing enterprises. And its maximum printing speed can reach 1076 characters per second, which can be used with high-speed assembly line coding operations. The ink circuit circulation system designed with patented technology does not pollute the ink and greatly saves the cost of consumables and labor.