stitching the components as well as stitching the assembled components into

Stitching the components as well as stitching the

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stitching the components as well as stitching the assembled components into products before sending the stitched products for final finishing process :- Caution i)The machine must be cleaned and oiled periodically for smooth sewing performance. ii ) The important parts viz., shurtle, feed dog, throat plate, tension unit e.t.c must be cleaned periodically. iii) Thread of the same thickness must be used in the bobbin and needle. iv) Appropriate needle must be used according to the thickness of material. v) While changing the needle, the needle must be fixed in the correct position. Otherwise not only the stitching performance become affected but also the needle may break. vi) While stitching, the material should not be pulled because, it will not only affect the
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stitch but also cause damage to the need le. vii) Only after pressing the needle into the component, the component must be turned for stitching. Otherwise, uniformity of the stitches at the corners of the component will be affected SEWING MACHINE TROUBLE SHOOTING AREAS PROBLEM POSSIBLE CAUSE AND ACTION Motor runs but the machine does not operate -Tighten clutch at the hand wheel if clutch slipping or -release bobbin wind control -adjust drive belt replace if worn out or -broken or lubricate if needs oil. Ne Needle thread breaks breaks -Incorrect threading. -reposition the needle if needle is inserted incorrectly. -decrease the needle tension if thread tension is too high -use correct size of the needle if the the needle size is wrong -make sure the needle tip is not bent or blurred -smoothen the path of the needle with emery cloth paper - clean the feed dog clogged with lint or thread. Bobbin thread breaks Smoothen the needle plate hole Replace the needle plate edges if it is blurred Wind the bobbin thread correctly if poorly wound Clean the bobbin case area if entangled by lint or thread Decrease the bobbin thread if the tension is too high Smoothen the edges of the bobbin case with emery paper Replace the bobbin tension spring if blurs on rough edges on bobbin tension spring Bobbin winds incorrectly Or doesn’t wind Adjust incorrectly positioned bobbin thread Replace worn friction wheel or Replace rubber rim Needle breaks Use needle of proper size if wrong size is inserted Replace the needle if it is bent or Reposition the needle is incorrectly inserted or Use the correct presser foot and needle plate if the presser foot and needle plate Loose or of wrong type or insert bobbin case correctly if wrongly done. Thread loops or bunches Adjust incorrectly set thread tension Clean lint from thread tension disc bobbin area or replace the needle if bent or blurred Rewind bobbin if not wound correctly Machine doesn’t stitch or skip stitches Use proper size needle or replace if bent or reposition the incorrectly inserted needle.
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Machine feeds fabric poorly or not straight line Use the correct presser foot for the job or adjust the presser foot or remove the lint or thread clogged in the feed dog or replace the feed dog if its teeth is worn out b ut t shank sho uld er Long groove Eye Blade shaft
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  • Spring '14
  • Onyancha PhD

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