1. The noodle thread is floating
Analysis: The clamp pressure is too small. Treatment method: Tighten the thread clamp to increase the tension of the cotton thread.
2. The bottom line is floating
Analysis: The bobbin spring is too loose. Solution: Tighten the bobbin spring screw to increase the tension of the bottom thread.
3. The stitch length is long and short
Analysis: The pressure of the presser foot is too small. Treatment method: Tighten the pressure regulating screw.
4. There is a thread sleeve under each stitch under the sewing material, which is like a towel thread sleeve
Analysis: The cloth feeding and thread take-up actions are not compatible. Treatment method: adjust the cloth feeding cam screw to make the cloth feeding and thread take-up actions harmonized.

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