In daily production on Beiren (BEIREN) series presses, roller system maintenance is one of the most common issues faced by press operators and maintenance personnel. As a representative domestic offset press, this model offers strong parts interchangeability and low maintenance costs, with electrical systems mostly controlled by domestic PLCs. If not addressed promptly, the consequences can range from compromised registration accuracy and print quality to extended downtime in severe cases.
I. Fault Symptoms
Periodic ghosting, ink bars, or uneven pressure on printed sheets; abnormal noise from roller bearings; local dot deformation.
II. Cause Analysis
Wear of roller bearings and bushings causing radial runout; inconsistent thickness of cylinder packing (blanket + underlay); roller gap (bearer clearance) deviating from standard values; uneven impression pressure during engagement; wear or excessive backlash in bridge gears and drive gears. Given the characteristics of Beiren domestic offset presses—strong parts interchangeability, low maintenance costs, and domestic PLC-controlled electrical systems—troubleshooting should prioritize checking key components against standard parameters.
III. Practical Repair Procedure
Use a dial indicator to measure radial runout and axial play of the rollers; replace bearings if out of tolerance. Recalculate and standardize packing thickness according to the machine model's specifications. Correct bearer clearance and adjust impression pressure to recommended values. Inspect gear mesh contact patterns on drive gears; replace worn parts in matched pairs.
IV. Preventive Measures
Regularly measure roller runout; maintain traceable records of packing data; avoid forced impression with excessively thick stock. These methods also apply to Beiren 300, Beiren 400, PZ4880, and N300 models. For actual operations, refer to the domestic CNC system / centralized lubrication controls and on-site conditions. For complex cases, it is recommended to contact professional maintenance support via the printm.cn platform.
