Printing system

A printing system comprising:

• a computer device;
• and
• a large size ink jet printer transmitting and receiving a data with the computer device,
• wherein said computer device includes:
• a RIP (Raster Image Process) program configured to convert an image/text signal into an image/text raster (bit map) image data for printing;
• a data pump interface configured to transfer said image/text raster (bit map) image data into a data path board of the large size ink jet printer;
• a carriage driving part control program controlling an operation of the carriage driving part of the large size ink jet printer;
• and
• a carriage driving part controller interface configured to transfer said signal of the carriage driving part control program into an I/O (Input and Output) controller board of the large size ink jet printer, and
• wherein said large size ink jet printer includes:
• at least one main ink tank;
• a level sensor configured to detect an ink level in said main ink tank;
• at least one printer head configured to inject ink on a printing object which is to be printed;
• a printer head controller configured to control the operation of said printer head;
• at least one reservoir ink tank configured to supply ink into the printer head;
• a reservoir ink tank level sensor configured to detect an ink level of said reservoir ink tank;
• an ink pump supplying an ink from the main ink tank to the reservoir ink tank;
• a pneumatic and negative pressure selection valve configured to selectively apply either a pneumatic or negative pressure to the reservoir ink tank;
• the data path board equipped with a MCU configured to analyze said image/text raster (bitmap) image data received from the data pump interface by the MCU, transfer an analyzed control signal into the head controller, and based on the analyzed control signals, controls the operation of the pneumatic and negative pressure selection valve and transfers the signal of the reservoir ink tank sensor to the I/O controller board;
• an ink supply control board configured to receive the ink level data of the reservoir ink tank from the I/O controller board, control the operation of the ink pump, and transfer the ink level data of the main tank to the I/O controller board;
• a carriage with the printer head;
• the carriage driving part configured to move the carriage in at least one direction;
• and
• the I/O controller board equipped with a MCU configured to analyze the data received from the computer device, the data path board and the ink supply control board, and to control the operation of the data path board, the ink supply board and the carriage driving part by the MCU of the I/O controller board.