At present, many printing companies have a shortage of operators, especially the captain who can independently operate the offset printing machine is hard to find. The phenomenon that the printing enterprise is "digging the wall" is very common, and the wages of the operators are also increasing. It has brought huge cost pressures to printing companies. In addition, the skill level of the operator will directly affect the quality of the print. Therefore, it is extremely urgent to increase the automation of the offset press, which not only reduces the number of operators, but also reduces the quality of printed products due to the low skill level of the operators. This article will introduce the technical difficulties of the unmanned offset press.
The main technical difficulties of the unmanned offset printing machine
Control algorithm
In the feedback control of the unmanned offset printing machine, the RIP software analyzes the data such as the dot size, color saturation, and cross-line registration, and also needs to calculate the ink adjustment motor, the water volume adjustment motor, and the adjustment motor through the control algorithm. And the adjustment of the voltage regulating motor, and what kind of mathematical model the control algorithm should use, how to choose the model parameters, how to achieve the best effect, etc., need to slowly explore in practice.
2. Bus controller
The bus controller is connected to the computer through the computer's universal PCI slot, exchanges data and commands upwards with the computer, and directly receives data and commands from the sensors and relays. Therefore, the communication speed should not be lower than 100Mb/s. The bus controller can adopt the PLC-like structure developed by the optocoupler isolation technology, which not only has fast communication speed, but also makes the versatility and anti-interference stronger, which is beneficial to the transformation and upgrading of the product.
3.ACC water quantity sensor
In the printing process, because the water film is relatively thin, it is very difficult for the ACC water quantity sensor to detect small changes in the amount of water and to resist interference. Therefore, the ACC water sensor should not use a common infrared sensor, but a laser sensor and a high-gain, high-stability amplifier can be considered for joint development with the photoelectric sensor manufacturer.
With the unmanned offset printing press, the operator only needs to put the cut paper on the paper feeding table, remove the printed product, and input several setting parameters in the computer remotely connected to the unmanned offset printing machine in the office. The work can be done automatically by the unmanned offset press, which eliminates the dependence of the printing on the operator, the printing quality is more stable and reliable, and the efficiency is higher. In addition, the wireless network card can be embedded in the unmanned offset printing machine, and the Internet cable can be connected to the Internet through the network cable to realize remote control, remote monitoring and diagnosis of the unmanned offset printing machine and automatically generate reports, thereby comprehensively improving the degree of automation and intelligence.
The above content is selected from Keyin Media. Printing Technology ·Digital Graphic Arts , No. 2, 2013, please pay attention to the journal channel for more journal content . Click on the latest journal content to enter the electronic journal channel of Keyin.com.
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