In the daily production of Komori series printing presses, cylinder system repair is one of the most common issues encountered by press operators and maintenance personnel. These Japanese-made machines are known for their stability, with mature H-UV drying and automatic registration systems, and even ink distribution across the inking train. If the problem is not addressed in time, it can at best affect registration accuracy and print quality, and at worst result in extended downtime.
I. Fault Symptoms: Periodic ghosting, ink bars, or uneven pressure on the printed sheets; abnormal noise from cylinder bearings; local dot deformation.
II. Cause Analysis: Radial runout caused by wear of cylinder bearings and bushings; inconsistent thickness of cylinder packing (blanket + underlay); roller gap (bearer clearance) deviating from standard values, leading to uneven impression pressure; wear of transfer gears or drive gears, or excessive backlash in gear meshing. Given the characteristics of Komori Japanese presses—known for stability, mature H-UV drying and automatic registration systems, and even ink distribution—the inspection should prioritize key components and standard parameters.
III. Hands-On Repair: Use a dial indicator to measure radial runout and axial play of the cylinders; replace bearings if out of tolerance. Recalculate and standardize packing thickness according to the machine model's specifications. Correct the bearer clearance and adjust impression pressure to the recommended values. Inspect the gear mesh contact pattern on drive gears and replace worn parts in pairs.
IV. Preventive Measures: Regularly check cylinder runout; maintain traceable records of packing data; avoid forced impression with excessively thick stock. The above methods also apply to models such as LS440, LS629, Lithrone, GL840, and G40. For actual operations, 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.
