In daily production on CHENGSENG series presses, feeder malfunctions are among the most common issues encountered by press operators and maintenance personnel. This model is a cost-effective domestic machine whose mechanical structure borrows from mature designs, leaving ample adjustment room for the air circuit and dampening rollers. If not addressed promptly, the consequences range from compromised registration accuracy and print quality in minor cases to extended downtime in severe ones.
I. Fault Symptoms: Frequent double sheets, missed sheets, skewed paper travel, or paper striking the front lays during printing, resulting in higher stoppage rates and unstable front-lay registration.
II. Cause Analysis: Insufficient vacuum in the separating and forwarding suction nozzles, or blocked/leaking air lines; improper height adjustment of the puller feet and blowing nozzles, causing poor sheet separation; deviation in front/side lay adjustments on the feeder and uneven pile surface; dirty or drifting sensitivity of the double-sheet detector (ultrasonic or mechanical type). Given that the CHENGSENG is a cost-effective domestic model with a mature borrowed mechanical design and generous adjustment range in the air circuit and dampening rollers, priority should be given to checking key components and standard parameters during troubleshooting.
III. Handling Steps: Clean the air pump, air lines, and filters, then measure and restore nozzle vacuum; re-set the height and air volume of the separating and forwarding suction nozzles according to paper weight; use a feeler gauge to correct the puller foot height (approximately three sheets thick) and adjust the blowing nozzle angle; clean the double-sheet detector and recalibrate it, replacing the sensing element if necessary.
IV. Preventive Measures: Clean the feeder air-line filters and suction nozzles every shift; regularly lubricate the feeder drive cams and bearings; recalibrate feeding parameters after changing paper weight. The above methods also apply to models such as the CS102, CS104, CS920, and half-format four-color presses. For practical operations, refer to the domestic PLC control console / automatic centralized lubrication system and on-site conditions. For complex situations, it is recommended to contact professional maintenance support through the printm.cn platform.
