③Caused by fraying thread (anti-fray)
・Is the timing of the closing time wrong?
In the case of the mechanical type, the timing may be out of order if the gear is engaged or worn due to aging.
・Is the tension of the anti-fray thread appropriate?
The tension of the anti-fray thread may be low due to dust.
・Is there a pill on the anti-fray thread?
The warp threads may not be fluffed, and depending on the spacing between the reeds and the material of the warp threads, pills may form on the warp threads.
・Is there any deterioration in the mechanism around the anti-fray thread?
Due to the wear of each part, the timing may be out of order or the opening amount may be incorrect.