Troubleshooting Thread Tension Sewing Machines
If you have thread tension problems here you find tips how to fix many of them. Tips and tricks professional.
There are three kinds of shuttle mechanism. The most of modern sewing machines have shuttle hook system with top loading bobbin.
This built-in bobbin case works quietly and gently. But this device has some problems that will be discussed below.
Vertical oscillating shuttle hook system is the second popular type. The vertical oscillating shuttle has bottom loading bobbins. In this post you find how it works.
Be sure the metal surface of bobbin case and other detail are in perfect condition or during sewing fabrics together problems can occur.
Vertical rotary shuttle hook system is the third type. Many factors can lead to skipped stitches and other thread tension problems. But the correct position of the shuttle hook point is the main.
This device has the ability to adjust the position of the hook point relative to the needle. This feature allows perfect work with different fabrics, such as knitted fabrics. If your sewing machine has such type of shuttle hook you need start trouble shooting of the thread tension problems with check it.
So let's see what problems can occur in this type hook with top loading bobbin and how to fix them.
When loops appear on back of fabric you need adjust top thread tension. Start with adjusting your thread tension dial. If this does not helps check the tip of the needle which should be sharp and not bent. Check the threading. Perhaps you need to replace the spool of thread on a different type of thread.
These are simple tips using them you can fix thread tension problems easy. But there are times when all these methods do not resolve loops on back of fabric.
Soon you will know another reason for. But first let's look at how the stitch is formed.
The tip of the shuttle touches the upper thread and pulling it around bobbin case.
At this position the top thread jumps on the plastic surface of the shuttle.
This segment of plastic surface a shuttle is experiencing a heavy load. Over time, there appears notch.
They impede the free and easy sliding the top thread. This is the reason the loops in a bottom fabric.
Remove nicks can be using a special abrasive tool. The best way - buy new bobbin case and to replace it.
The second reason leads to problems of stitching is the displacement of the needle bar. During stitching the leather or thick fabrics the needle bar a sewing machine can shift up.
Check position needle ear with respect to the spout of the shuttle. If you need to lower the needle bar you need to loosen this screw.
Let's look closely at the thread tension assembly. Between them will collected pieces of threads, fluff and dust. They interfere the normal operation of the device which leads to various defects in the stitches.
Remove them with the tweezers or using an awl.
This driving belt can also cause to the thread tension problems of your sewing machine. During stitching the leather or thick fabrics the belt may jump on 1-2 "tooth". This is a very complex repair, but you need to know about it.
The surface of the needle plate should be without chipping of needle attacks. They can interfere the movement the fabric and the threads that affects the tension threads of stitches and affects the quality of the stitching.
Here is a list with the complex reasons of thread tension problems that is known only to the master. If you have tried the simple ways of setting the thread tension but your machine is still not working use this troubleshooting tips.
English isn't my first language, so please excuse any mistakes and help correct them.
E-mail for sending is on the contact page.
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