Jamming: Jamming (卡齿)
A condition where the slider cannot move smoothly because teeth, fabric or foreign matter block its channel. Common causes are uneven tooth pitch, burrs, bent teeth, thread caught in the slider and incorrect slider gauge. Forcing a jammed slider can break teeth and damage the puller. Operators should stop, reverse slightly and clear the obstruction. Prevention relies on process control, burr removal and correct sewing so stitches stay clear of teeth.