One common issue when working with all kinds of sewing machines is thread tension. Without the proper tension, stitching can be uneven, the thread can break, and other problems can arise. Fortunately, correcting the tension on Juki sewing machines like the Juki HZL G-220 is not very difficult. After determining the tension problem, it only requires a few minutes to test and adjust the machine back to a more even tension setting.
Detecting Incorrect Thread Tension
Ideally, when the upper and bottom thread join to create a stitch, the stitches are balanced and the knot area is hidden between the layers of fabric. When the thread tension on sewing machines is not balanced, a number of problems can occur that can result in some common stitching issues. Top thread tension that has been adjusted too tightly is one of the causes of frequent thread breaking. A tight top thread pulls the bobbin thread all the way through to the top of the fabric, while a tight bobbin thread pulls the top thread all the way through to the bottom. With good observation, anyone who works on sewing machines like the Juki HZL G-220 should be able to determine where the problem lies in order to correct the issue.
Adjusting Bobbin Tension
When signs appear that the top stitch is being pulled all the way through the fabric, start by taking out the entire bobbin case and checking a few things. First, make sure the bobbin is wound in the right direction and that the thread is neither too tight nor too loose on the spool. Then inspect the bobbin case for damage. If in doubt, use a different case.
Test the bobbin tension by putting the spool in the case, holding the end of the thread, and then dropping the bobbin. If it releases a few inches of thread and then stops, the tension is correct. If no thread unwinds, tension is too tight. If the bobbin unwinds more than a few inches, it is too loose. Adjust the little screw on the front of the case until the tension is accurate again.
Adjusting Top Thread Tension
When the problem is the top thread, start by unthreading the machine, then carefully re-thread, making sure to pass the thread through all necessary guides, then try again. Next, clean the machine and look for other things that could be causing the problem. After confirming there are no other issues, adjust the tension dial. Although the dial may be in different places on each of the various types of Juki sewing machines, they all work the same. Turn the dial to a higher number if the top tension is too loose and to a lower number if it is too tight. Adjust in half number increments, testing in between, until finding the right balance between top and bottom stitches.
Getting the right sewing machine tension involves careful observation of what is occurring with the stitching and an understanding of how to rebalance it. By using a gradual approach, anyone sewing on Juki sewing machines like the Juki HZL G-220 should be able to adjust both their bobbin and top thread function so the stitching is neither too tight or too loose. In the event these tips do not remedy the problem, refer to the user manual that was included with the machine or get the machine professionally repaired!