Re: Thread from bobin doesn`t leave smooth sewing on...
Hi make sure pressure foot is raised before you start to thread machine ortherwise thread will not slide between tension discs this will cause bunching underside of fabric ...good idea to replace needle good luck
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Be sure you leave a 3-4" tail on the bobbin when you insert it. Hold the end of the top thread, turn the fly wheel toward you until the needle goes down into the bobbin, grabs the bobbin thread and pulls it up. Take both threads toward the back of the machine and pull out about 6". Hold both threads as you take the first stitch in your fabric.
I would suggest replacing the needle, make sure the needle is correct for the fabric and thread being sewed.
sometimes when the fabric gets caught in the feed dog area, there are different reasons, I'll list some below
fabric is too thin--needs stabilizer
top thread has some off the thread take up lever
bobbin is turned the wrong way in the bobbin case
needle is damaged--replace needle with correct size for fabric being sewed--and insert the needle correctly into the needle holder.
if these suggestions don't help, I also suggest having the machine checked to see if there is some other problem like timing.
Have you checked the Bobin that the thread is in, sometimes the thread is been loaded on more on one side of it, when that happen it is very difficult to sew, check the tightness of the thread for the bottom and readjust it.
Load your sewing machine with one color on top, threaded through the needle. Load the second color thread into the bobbin and thread.
Fold the scrap fabric in half, and sew a straight stitch at least 2 inches long. Look closely at the seam. If you see loops of the bottom color thread on top of the fabric, proceed to Step 3. If you see loops of the top color thread on the bottom of the fabric, proceed to step 4.
Loosen the top tension. Since the top tension is so tight, it is pulling the bottom thread up through the fabric. Loosen the top tension by turning the numbered knob on the front of the sewing machine counterclockwise by one number.
Tighten the top tension. Since the top tension is too loose, the bottom thread is pulling the top thread down through the fabric. Tighten the top tension by turning the numbered knob on the front of the sewing machine clockwise by one number.
Sew a straight stitch 3 inches in length. Check the stitching. It is perfect if the threads meet in the middle, and you can only see the top thread on top and the bottom thread on bottom. If it still needs adjusting, go back to step 2 to repeat the needed steps.
Using two different colored threads makes it easier for you to see which thread is being pulled.
Always use proper precautions when working with electrical machines.
you can either increase the bottom tension or reduce the top tension .. you will notice a little screw on the bobin case ... that screw adjusts the force on a small flat spring which provides the bottom tension (the thread goes under the spring when properly threaded) .. .. tighten that screw a little to increase bottom tension .. you can pull thread thru the bobin case to get a feel for how much tension you have ... you dont have to turn the screw very far to make a significant difference .. try just 1/4 of a turn at a time .. remember where it was originally set so you can put it back when you are finished with your present project .. the greater the bottom tension the less bobin thread will show at the top ... if you get the tension too high then you might see some puckering as you sew ..
From your description it appears that you have tried tension settings on the upper tension control adjustment knob without success.
Check that the bobin tension is adjusted correctly by taking out the bobin complete with the spool.
Pull the cotton thread and it should be a smooth light pressure if the tension is correct. If it is tight to pull or pulls freely then adjust the tension screw which is found on the outside of the bobbin. The screw is very small and requires a minature size screwdriver. The adjustment will only be a slight turn of the screw one way or the other to obtain the correct tension(depending if it was loose or tight).
Once this is set reinstall the bobin and tread up the machine, hopefully with the upper tension set at approx."2" the machine will sew correctly.
You also need to adjust the pressure foot on the top of the machine. This regulates how much pressure is put on the fabric and the feed. Sounds like it is wrong somehow-maybe you need more pressure. Check the pressure adjustment is screwed in properly if it is this type which unscrews.The pressure adjuster Im reffering to is generally a silver colour and looks a bit like a basic tyre pressure guage or pressure cooker valve-it just got a cuple of lines on it and sits on the top left of the machine above the needle bar. The other thing which could cause problems is the bobbin tension-make sure it is running thru smoothly but not too loose.