In the daily production of Komori series printing presses, misregistration is one of the most frequently encountered problems by press operators and maintenance personnel. This Japanese-made model is renowned for its stability, with mature H-UV drying and automatic registration systems, as well as uniform ink distribution across the inking train. If not addressed promptly, it can range from affecting registration accuracy and print quality to causing extended downtime in severe cases.
1. Fault Symptoms: Front-to-back or side-to-side misalignment between colors, side lay failing to feed paper, inconsistent gripper bite sizes, and ghosting on fine lines.
2. Cause Analysis: Insufficient side lay (lateral register) tension or adjustment deviation; inconsistent front lay heights; uneven gripper bite force; paper stretch (due to moisture content changes); cumulative errors in blanket cylinder packing thickness. Combined with the characteristics of Komori Japanese presses—known for stability, mature H-UV drying and automatic registration systems, and uniform ink distribution—the troubleshooting process should prioritize checking key components against standard parameters.
3. Parts Replacement: Use a tension gauge to calibrate side lay tension and roller nip clearance; calibrate front lay heights and gripper bite force color by color; control workshop temperature and humidity, allowing paper to acclimate in advance; recheck packing for each color and standardize it.
4. Consumable Parts Checklist: For misregistration issues, it is recommended to keep the following in stock: related bearings/bushings, Komori-compatible sensors and suction nozzles, seals, and standard wear rollers. When replacing, always use original or certified parts and verify model numbers.
5. Preventive Measures: Run registration test sheets before startup; monitor paper moisture content; periodically calibrate the side lay. The above methods also apply to models such as LS440, LS629, Lithrone, GL840, and G40. For practical operation, refer to the PQC Print Quality Control system / KMS console and on-site conditions. For complex situations, it is recommended to contact professional maintenance support through the printm.cn platform.
