Jumper problems and solutions

During the sewing process, the needle and thread loops are not set up by the hook or hook tip, resulting in incomplete stitches.

Question	Recommendations
Improper adjustment of adjusting spring	Readjust the adjusting spring
Line tension is too tight	Re-adjust line tension
Hook/hook timing error	Return to standard position and check for coil formation
Damaged hook/hook tip	Grind the damaged part of the shuttle/hook or replace the damaged part
Wrong needle bar height	Readjust to standard position
Wrong needle type	Use the correct needle type
Needle blocked by residue	Use needle with anti-plug treatment instead and lubricated suture
Poor suture quality	Change to correctly processed quality line
Needle thread extension length is too high	Use low extension length sutures instead
Slack in high stretch fabrics	Adjust the needle plate tongue to fit the needle size and use the round mouth needle
Wrong Pin Number	Use a needle with a needle number matching a line code instead
The pinhole of the needle plate is too large	Use needle plates with smaller pinholes instead
Jumper due to mechanical timing error	Adjust back to standard position
Slack due to poor contact between presser foot and material	Readjust the presser foot or use special presser foot
The needle is deformed or bent	Reinstall the needle protector, change the needle number, and replace the needle.
Jumpers due to poor quality stitches	Replacement of stitches with low elongation and better handling

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Jiangsu Flying Tiger Needle Industry Co., Ltd

Address: Shaozhi Industrial Concentration Zone, Qidong City, Jiangsu Province

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