In daily production on Ryobi (Ryobi / Liyoubi) series printing presses, gripper bar repair is one of the most common issues encountered by press operators and maintenance personnel. This model is a mainstay in the Japanese small-to-medium format segment, known for its ease of operation, simple air and water circuit design, and straightforward maintenance. However, if not addressed in a timely manner, it can range from affecting registration accuracy and print quality to causing extended downtime in severe cases.
I. Typical Fault Symptoms
Uneven gripper bite force leads to sheet fan-out at delivery, unstable registration, and paper marks caused by worn gripper pads.
II. Common Q&A
Q1: What is the most common cause of gripper bar repair?
A: Mainly fatigue of the gripper springs and reduced bite force; worn gripper pads or ink contamination on the pads.
Q2: What should be noted when handling this on a Ryobi press?
A: It is necessary to work in conjunction with the PCS console / automatic dampening system and follow the standard procedure.
Q3: How can recurrence be avoided?
A: Regularly calibrate the gripper bite force.
III. Handling Procedure
Use a tension gauge to calibrate each gripper for consistent bite force.
Replace worn gripper pads and clean them.
Grind or replace the opening/closing cam.
Check the straightness of the gripper shaft.
The above methods also apply to models such as the 920, 1050, 920PF, and MHI. For actual operation, please refer to the PCS console / automatic dampening system and on-site conditions. In complex situations, it is recommended to contact professional maintenance support through the printm.cn platform.
