In daily production on Komori series presses, feeder delivery faults are among the most common issues encountered by press operators and maintenance personnel. These Japanese machines are known for their stability, with mature H-UV drying and automatic registration systems, and uniform ink distribution across the inking unit. If not addressed promptly, the consequences range from compromised registration accuracy and print quality to extended downtime in severe cases.
I. Fault Symptoms: Frequent double sheets, missed sheets, skewed sheet travel, or sheets striking the front lays during printing, resulting in increased stoppage rates and unstable front-lay registration.
II. Cause Analysis: Insufficient vacuum in the separating and forwarding suction heads, or blocked/damaged air lines; improper height adjustment of the pile joggers and sheet-separating blowers, causing poor sheet separation; deviations in front/side lay adjustments on the feeder, or uneven pile surface; dirty or drifting sensitivity on the double-sheet detector (ultrasonic or mechanical type). Given that Komori Japanese presses are renowned for stability, with mature H-UV drying and automatic registration systems and uniform ink distribution, troubleshooting should prioritize checking key components against standard parameters.
III. Treatment Steps: Clean the air pump, air lines, and filters; measure and restore suction-head vacuum levels. Re-set the height and air volume of the separating and forwarding suction heads according to paper grammage. Use a feeler gauge to correct the pile jogger height (approximately 3 sheets thick) and adjust the sheet-separating blower angle. Clean the double-sheet detector and recalibrate it; replace the sensing element if necessary.
IV. Preventive Measures: Clean the feeder air-line filters and suction heads every shift. Regularly lubricate the feeder drive cams and bearings. Recalibrate feeding parameters after changing paper grammage. The above methods also apply to models such as the 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 seek professional maintenance support through the printm.cn platform.
