1. Slit thick material broken needle

       Analysis: The needle is too thin or curved, the thickness of the sewing material is uneven, and the needle bar is too large.

       Treatment method: change the new thick needle, adapt to slow down the sewing speed and help the feeding by hand, and replace the new needle bar or needle bar sleeve.

       2. Short needle spacing constant needle, long needle distance broken needle

       Analysis: The feed dog movement is delayed, the feed dog is unqualified, and the needle is broken at the rear end of the cloth.

       Treatment method: The positioning of the feeding cam should be adjusted, and the needle spacing or replacement of the feeding teeth should be appropriately shortened.

       3. The needle is broken under the needle plate

       Analysis: the needle position is low, the needle touches the shuttle, the shuttle is not installed, the shuttle tip touches the needle, the shuttle and the needle end are too small or too large, and the shuttle is hit or lost. Needle effect.

       Treatment method: adjust the position of the needle bar or the needle, reinstall the shuttle, and adjust the gap between the end of the shuttle and the needle.

       4. The needle is broken on the needle plate

       Analysis: the hand sewing material is too strong, causing the needle to bend, the presser foot screw is loose, causing the presser foot to tilt the needle, the feeding cam displacement causes the sewing material to break the needle, and there is a hard object in the sewing material to break the needle .

       Treatment method: Strengthen the operation practice, adjust the presser foot to tighten the screw, and adjust the position of the feed cam screw.