Common Troubles and Troubleshooting Methods of VC008 C Multi-needle Machine

JK008-13032P

Common troubles and troubleshooting methods of VC008 multi-needle machine

• Needle is Broken

possible causes:

1. The specification of the needle is not suitable for the materials.
2. The needle is incorrectly assembled.
3. One of the adjustmens of the needle/looper/thread wiper is incorrect.
4. The pulling roller (VCL) does not cooperate with the feed dog.
5. The presser foot is rubbing against the needle.
6. The feed dog height is not enough.
7. The height of needle bar is too low.
8. Thread is too thick or in bad quality.
9. The needle doesn’t go through the needle plate hole correctly.JK008-12064P PQ

• Skipped Stitch

possible causes:

1. The needle size is not right.
2. The needle is bent or has burrs.
3. The timing of needle/looper/thread wiper is incorrect.
4. The position relation between needle and needle guard is incorrect.
5. The quality of thread is poor.
6. The threading quantity of VF18 is not enough.
7. The timing of VE06 is incorrect.
8. The pressure of thread control knob is incorrect.
9. The speed of the puller is incorrect.
10. The position of VK13 is incorrect.
11. Incorrect threading.
12. The timing relationship of looper is incorrect.
13. The clearance between the needle guard and the needle is too wide.
14. Improper pressure adjustment of the presser foot.
    JK008-12064P VPT

• Thread broken

possible causes:

1. The needle is bent or uneven.
2. Poor quality of the thread or uneven thread.
3. The looper rubs against the needle.
4. The timing ofneedle/looper/thread wiper is incorrect.
5. The threading quantity of VF18 is not enough.
6. The thread control knob is too tight.
7. Incorrectly threading.
8. Improper adjustment of the looper thread.
9. Inappropriate left and right adjustments of the needle/looper/thread wiper.
10. Sewing starts before the fabrics are fed completely under the presser foot.
11. The needle doesn’t go through the needle plate hole correctly.JK008-12064P-VSQStitch of JK008-12064P-VSQ

• The sewing is not smooth

possible causes:

1. The height of the feed dog doesn’t match the fabrics.
2. Improper pressure adjustment of the presser foot.
3. The timing adjustment of the puller is inappropriate.
4. The lower surface of the presser foot is worn or not smooth.
5. The feed dog is worn or doesn’t keep horizontally.
6. The chosen needle is not suitable for the sewing fabrics.
7. There are burrs on the gear puller
8. The pressure of the puller is too strong or too weak.
9. The clearance between the upper and the lower puller is not correct,or the two puller are not parallel to each other.
10. The roller VCL33 doesn’t function well.
11. Inappropriate pressure adjustment of the thread control knob.
12. Inappropriate pressure adjustment of the rear puller.JK008-12064P VSQ VSM

• Noise

possible causes:

1. The feed dog has touched the needle plate.
2. The VB14 and VB07 are not assembled well.
3. The thread wiper runs into the feed dog.
4. The left/right positions of the VD31 are incorrect.
5. The preeser foot doesn’t stay on the needle plate flatly and well.

Common troubles and troubleshooting methods of VC008 auxiliary parts 

• VWL Auxiliary parts – VWL

JK008-04085P VWL

The elastic ribbon band carrier is not smooth.

possible causes:

1. Keep VWL08 and VWL14 these two rollers parallel and close to each other,in order to prevent the elastic ribbon from slipping.
2. The surface of VWL08 and VWL14 these two rollers is worn, so they can not hold the elastic ribbon on tight.
3. The screw for SM612, VWL11 get loose or was not locked,which caused bad rollers’
4. The adjustment of press for LF131 is too weak and it causes slipping of the elastic ribbon during sewing.
5. Inappropriate fabricadjustment by operator when sewing.

• VCE 

The position of the elastic ribbon is not stable when sewing.

possible causes:

1. Inappropriate position adjustment of VCE02. It didn’t matach the width of elastic ribbon.
2. The VCE group has been deformed or is not locked and loose.
3. The worker is unskilled.

• VPQ 

JK008-12064P VPQ-T

Pleating pattern is bad.

possible causes:

1. Improper position adjustment of the presser foot-P9212/P9213.
2. The stitch length is too narrow or improper tightness adjustment of thread control.
3. The pulling quantity of rear roller does not cooperate with the stitch size.
4. The pressure of press foot is too strong or too weak.

• VPL 

The left & right stitch length and the cloth edge is asymmetric.

possible causes:

1. Improper adjustment of horn
2. Improper angle adjustment of the press foot

• The cloth folding edge is not smooth.

possible causes:

1. The horn size does not match to the stitch length(The specification of machine).
2. The width of cloth and the entrance size of horn are wrong.
3. The poor quality of horn. Need to change to a good horn.

• VSF 

The cloth is unstable when sewing.

possible causes:

1. The width of cloth dose not match to the entrance size of horn.
2. The cloth is badly tailored with wrong height or width.
3. The specification of horn dose not match to the needle stitch.
4. The worker is unskilled.