Thin, Coated Paper Eject Error (Stapled Sheets)
In the binding process, when thin, coated paper [A] is discharged from the staple tray [B], as the staple tray that pushes and lifts up the trailing edge of the paper is at a steep angle (55°), it results in a difference in linear speed between the leading edge and trailing edge, making it buckle; the release pawl [C] is unable to lift it up, resulting in scratches on the paper and/or jams.
Cause:
During binding processes (edge stapling, saddle stitching), paper is transported to and assembled in a staple tray and then it is discharged by a release claw.
When discharging thin, coated paper, if the paper is weak-bodied, short-grained paper, as the mechanism tries to push and lift up the trailing edge of the paper, it makes it buckle, resulting in scratches on the paper and/or jams due to failure to release.
This is likely to occur if:
Environment: The higher the humidity, the weaker the body of the paper becomes and the more prone to buckling.
Paper body: If the paper is weak-bodied (short-grained), during discharge the efficiency drops in transmitting the transfer force to the leading edge of the paper, which is a factor in producing buckling.
Paper length: The discharge distance increases in proportion to the paper length and the resistance due to friction between the paper and the tray has a strong influence as a factor in buckling occurring.
Number of sheets: the fewer the sheets of paper, the weaker the body of the bundle of paper, and the more prone to buckling.
Solution:
