White Overlock Machine Problems

Overlock machines use several spools of thread.

An overlock machine is better known as a serger. Most sergers are white in color. Sergers are intricate machines which use as many as six thread sources to stitch over seams, providing a non-fraying, professional seam on clothing and other items. Most problems that occur are centered around thread or fabric feed.

Skipped Stitches

When an overlock machine skips stitches it usually means the needle is dull. You may not be aware, but different fabric thickness requires different sizes of needle. Using the wrong size needle can also cause your machine to skip stitches.

Machine Stops Sewing

If your serger suddenly stops sewing, check for thread lock. Thread lock occurs when threads get wrapped around the bobbin case. If this has not occurred it could be that the motor belt is slipping, in which case the belt should be replaced.

Fabric Feed

If your machine is not feeding fabric correctly, the sewing foot pressure may be too light. It could also be that the stitch length is set too small, or the cutting knives are dull and should be replaced.

No Power

Some overlock machines will not work if the light bulb is blown; change the bulb. A safety precaution keeps the machine from working if the looper threading lid is not completely closed. One other thing to check is the fuse inside the wall plug end of the power cord.

References

• PFAFF Machines: Overlocker Troubleshooting