Problems And Rectification of Sewing Machine

PROBLEMS AND RECTIFICATION:

Some of the common troubles and their possible cause are listed below. You can take care of most of these by yourself. In case of major troubles the help of a qualified mechanic should be obtained.

           Tangles thread at the beginning:

         Bobbin too full 2. Bobbin set in wrong direction 3. Under thread not drawn up

Both threads not pulled back under the presser foot 5. Machine not properly oiled and cleaned.

           Skipped stitches:

         Needle bent 2. Needle set with long groove turned to wrong side 3. Needle too high or too low in the needle bar 4. Needle too small 5. Needle threaded from the worng side 6. Excess oil on shuttle.

           Upper thread breaking:

1. Poor thread 2. Machine incorrectly threaded 3. Needle set on wrong side 4. Needle too fine for thread 5. Needle threaded from the wrong side 6. Upper tension too tight 7. Sharp edges on needle plate hole or shuttle 8. Thread take-up spring broken.

           Lower thread breaking:

         Poor thread 2. Lower tension too tight 3. Bobbin case threaded wrongly 4. Sharp edge on needle plate 5. Bobbin wound too full or uneven 6. Dirt in bobbin case.

           Fabric puckering:

         One or both tension too tight 2. Stitch too long for material being sewn 3. Blunt  needle.

         Needle breaking:

Incorrect size of needle for thread and fabric 2. Needle blunt 3. Pulling of material while stitching 4. Presser foot incorrectly set 5. Crossing a thick seam using a too small needle.

           Staggered stitches:

         Too little pressure on presser foot 2. Take-up spring weak, broken or missing.

           Uneven stitch length:

        Incorrect presser foot pressure 2. Feed dog dirty or worn out.

            Material not feeding correctly:

         Stitch regulator set too close to '0' point 2. Dirt under needle plate near feed dog

        incorrect presser foot pressure 4. Bent presser foot.

            Machine runs heavily:

   Lack of oil

 2. Thread wound round wheel or treadle bearing

 3. Belt too tight

 Bobbin winder pressed down

 5. Thread jammed in shuttle race

 6. Gummed oil or dirt on bearings.