Pre-registration method for printing machine based on phase retrieval

Abstract

The invention provides a pre-registration method for a printing machine based on phase retrieval. The pre-registration method comprises the following steps: step 1, a phase save command is send to all color unit drivers at the same time; step 2, all the color unit drivers receive the command at the same time and latch real-time phases; step 3, the latched phases are respectively sent to a PLC; step 4, the phase of the first color unit is subtracted from the phases of all the color units received through the PLC to acquire a phase difference, the calculated phase difference is temporarily saved, and then the next phase save command is sent to the color unit drivers; step 5, when the printing machine works stably, the phase difference in the stable state, namely the set phase difference is saved; step 6, the color unit drivers are controlled to perform phase retrieval on all the color units of the printing machine through the PLC according to the set phase difference when registration based on phase retrieval of the printing machine needs to be carried out. According to the pre-registration method for the printing machine based on phase retrieval, the overprinting recovery speed is high, and the operation is convenient.

Description

Technical field [0001] The invention relates to a printing press pre-register method based on phase recovery, which belongs to the field of industrial control. Background technique [0002] The existing initial registration technology is mostly based on the calculation method of material length and plate circumference, which requires the customer to first adjust the color plate rollers to the same position, and then perform the pre-registering action. This operation is more troublesome. At the same time, because the initial position of the pre-alignment plate is calculated mathematically based on the circumference of the plate roller, it is affected by factors such as mechanical accuracy, and the phase cannot be accurate. After printing, the operator manually adjusts the phase of each color group for calibration. The process of phase adjustment often needs to actually print a section, and then repeatedly adjust the phase until the best effect is achieved. These actions not onl...

AI Technical Summary

Problems solved by technology

These actions not only prolong the registration time, but also cause waste of printing materials, ink and labor, reduce production efficiency, and reduce the benefits of the enterprise.

Even for a printing machine that has been adjusted in phase, manual calibration is still required every time the color plate rolls are messed up or reloaded for some reason, which reduces production efficiency

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