The Upper Thread Having No Tension
Sometimes there is no tension in the upper thread. You may at times find that the thread is tangled beneath the fabric. There will be several threads there. Most people are inclined to believe that this could be due to the problem with the bobbin.
But it is not that. It is because of a lack of tension in the top thread that leads to such a mess. There is not enough tension for the needle to pull the thread upward through the cloth. You can remedy the situation by rethreading the needle again. Please raise the presser foot for this purpose. Go through the instruction for threading your machine very carefully.
Dust And Lint Preventing Free Movement
Lint is a common by-product of sewing. Lint can accumulate in large quantities when you are stitching continuously. Dust is another thing that can get between the various parts of the machine. Oil and grease are commonly used to keep the parts lubricated for smooth functioning.
But if you don’t clean the machine regularly these two could become your enemies by making the lint and dust cling to them. The combination of all these will form a hard and sticky mess that will prevent the parts from moving. This is another reason for your handwheel to refuse to rotate.
Loosen The Inner Knob To Free The Handwheel
In older sewing machines you can see an inner knob which is a smaller wheel that is fixed in the middle of the handwheel. This inner knob might be locked which will not allow the handwheel to turn freely. Once you unlock the knob the handwheel will turn without any difficulty.
When you wind the bobbin and have to turn the handwheel you will unlock the inner knob. In the same way, you must unlock it to free the handwheel. If you are using an older model of sewing machine this is the first thing that you must do get the handwheel to turn.