Saturday, June 04, 2016

Janome Sewing machine - Janome Hello kitty - 13512 – 14412 – 15312 – Troubleshooting procedure – Skipping stitches - Fabric not moving - Home appliance repair and service

Category: Home Appliances Repair and Service 

Contents of this article 

  • Troubleshooting procedure 
  • Bobbin thread breaking 
  • Deformation of pattern 

Janome Hello kitty - 1351214412 15312

TROUBLESHOOTING PROCEDURE 
Skipping stitches
CAUSES
1. Needle is not inserted properly.
2. Needle is bent or worn.
3. Incorrectly threaded
4. Needle or thread is inappropriate for fabric being sewn.
5. Sewing on stretch fabric
6. Inappropriate needle bar height
7. Inappropriate needle to hook timing
8. Inappropriate needle to hook clearance
SOLUTIONS
Insert the needle properly.
Change the needle.
Rethread.
Use the recommended sewing needle and thread.
Use A #11 blue tip needle.
Needle bar height.
Needle timing to shuttle.
Clearance between needle and hook.
Fabric not moving
CAUSES
1. Incorrect feed dog height
2. Thread on bottom side of fabric is jammed up.
3. Feed dog teeth are worn.
SOLUTIONS
“Feed dog height.”
Make sure to bring both needle and bobbin thread under the foot when starting sewing.
Change the feed dog.
Breaking upper thread
CAUSES
1. Initial sewing speed is too fast.
2. Thread path is incorrect.
3. Needle is bent or dull.
4. Upper thread tension is too strong.
5. Needle size is inappropriate for fabric.
6. Needle eye is worn.
7. Needle hole in needle plate is worn or burred.
SOLUTIONS
Start with medium speed.
Use the proper thread path.
Replace with a new needle.
Adjust upper thread tension correctly.
Use appropriate needle and thread for fabric in use.
Change the needle.
Repair the hole or replace the needle plate.
Breaking bobbin thread
1. Incorrectly thread bobbin case.
2. Too much thread is around on the bobbin.
3. Lint is stuck inside the hook race.
4. Thread quality is too low.
5. Thread is jamming around the bobbin.
6. Bobbin thread tension is too strong.
SOLUTIONS
Thread bobbin case correctly.
Adjust the position of stopper.
Clean the hook race.
Change to a high quality sewing thread.
Clear out the jamming thread.
Adjust bobbin thread tension correctly.
Needle breaks
1. Needle is hitting the needle plate.
2. Needle is bent or worn.
3. Needle is hitting the hook race.
4. The fabric moves while the needle is piercing it, or the needle zigzags while in fabric.
5. Fabric is being pulled too strongly while sewing.
SOLUTIONS
Adjustment Needle drop.
Change the needle.
Clearance between needle and hook .
Needle swing.
Guide the fabric gently while sewing.
Noisy operation
CAUSES
1. Backlash between shuttle hook gear and lower shaft gear is too great.
2. Lower shaft gear is loose.
3. Inappropriate belt tension.
4. Upper shaft gear is loose.
5. Not enough oil.
SOLUTIONS 
Clearance between needle and hook.”
Eliminate the looseness.
Motor belt tension.
Eliminate the looseness.
Oil all moving parts.
Deformation of pattern
1. Inappropriate zigzag synchronization.
2. Inappropriate disengagement of cam follower.
3. Upper thread tension is too strong.
4. Inappropriate feed balance BALANCE
SOLUTIONS
Needle swing.
Disengagement of cam follower.
Adjust upper thread tension correctly.
Feed balance on stretch stitch.