Sewing on sewing machines such as the Juki F300 is an activity enjoyed by many people who enjoy creating beautiful garments and other sewn items. It can take some practice to learn how to use sewing machines; however, once such skills have been acquired, the possibilities are endless in what a person can create. Something many sewers may not know about sewing machines is exactly how a stitch is formed. Understanding the basics of stitch formation may help sewers troubleshoot problems with their Juki or any other type of sewing machines when the stitches are not holding together properly.
Lockstitch Sewing Machine Technology
Sewing machines work by sewing two threads through fabric in such a way that they lock together, forming a line of stitches that can be sewn flat and hold together. This technique is called lockstitch sewing and is the basis on which every modern sewing machine, including the Juki F300 and other Juki sewing machines, are designed.
Lockstitch sewing using a needle and a rotary hook is technology that was developed in the 1800's. Although the idea was very progressive for its time, it revolutionized sewing and the advancement of the sewing machine. Today, although there are various stitches that can be done with a sewing machine, they are all a form of lockstitch that involves sewing one or two threads in such a way that they hold the fabric together and do not unravel.
Bobbins and Rotary Hooks
Sewing with sewing machines requires the use of a bobbin of thread and a spool of thread. Bobbins, which hold threat and provide the underside portion of a stitch to lock the thread in lockstitch sewing, are placed inside a bobbin case, then set into the machine beneath the sewing surface and the feed dogs. There is a rotary hook mechanism on the bobbin case, which is a critical factor in lockstitch sewing when using any modern sewing machine. The rotary hook mechanism rotates so that the bobbin thread is incorporated into the path of the main thread, locking it into place.
How Sewing Machine Stitches Are Formed
Sewing machine stitches are formed by pushing a main thread through fabric, then locking that thread in with a second thread that is fed from the bobbin. As the needle on the machine pushes the main thread through the fabric, the rotary hook mechanism on the bobbin case grabs this thread, pulling it out and around the thread fed by the bobbin, then releases it.
As a result, the main thread remains hooked around the locking thread from the bobbin, securing the stitch in the fabric so that it cannot come out. On the top surface, only the main stitch is visible. On the underside of the sewn surface, the locking thread is visible. Removing stitches sewn on sewing machines requires pulling both the main thread and the bobbin thread in order to unlock the stitches.
Understanding how stitches are sewn on sewing machines like Juki sewing machines can be very helpful, as it allows sewers to understand how and what the machine is doing. In order for sewing machines to actually make stitches hold fabric together, both the needle pushing the main thread and the rotary hook mechanism incorporating the bobbin thread must function properly. Any type of sewing on a Juki F300, or any other machine always involves this intricate process!