There can be many reasons behind the problems that arise while sewing and knowing the cause of these problems and a solution for each particular cause is essential. These problems can be minimised by avoiding errors during handing of materials / machines and by following the right working methods.
Needle Thread Breakage
Cause :
Misaligned off winding from thread package.
Remedy :
Ensure that the overhead guide is directly above cop stand pin, at 2½ times the height of the thread package. Use a foam pad to prevent package tilting.
Cause :
Trapping at package base.
Remedy :
Reduce the thread stand height to prevent vibration and spillage. Use a foam pad to prevent trapping after spillage.
Cause :
Thread trapped at thread guide.
Remedy :
Can occur after thread breaks. Rethread correctly.
Cause :
Snarling before tension disc.
Remedy :
Increase the wraps on pre-tension thread guides and reduce disc tension. Ensure discs are smooth.
Cause :
Excessive tension.
Remedy :
Use a stronger thread or adjust tension.
Cause :
Broken check spring.
Remedy :
Replace and adjust.
Cause :
Sharp edges on throat plate, hook point, needle guard, bobbin case, needle groove or eye.
Remedy :
Polish rough edges and replace if necessary. Replace the needle being used with a higher quality needle.
Cause :
Thread fraying at needle.
Remedy :
Use finer thread or coarser needle, as appropriate.
Cause :
Excessive needle heat; groove or eye blocked with melted fabric.
Remedy :
Improve the fabric finish. Change to a better needle, style and finish. Apply needle lubricant via thread. Use a needle cooler.
Cause :
Hook overheating.
Remedy :
Ensure adequate oil supply. Check the needle to hook clearance.
Cause :
Poor quality thread.
Remedy :
Change to a correctly finished thread of better quality.
Answers & Comments
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Causes and Remedies
Needle Thread Breakage
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Hope it helps (◕ᴗ◕✿)