The Anatomy of a TinLizzie18 Bobbin Case

Posted by on November 13, 2017

Becoming familiar with the TinLizzie18 bobbin case will increase quilting success.  Each part has an important function.  Looking inside the bobbin case, you will see what is called the anti-backlash spring.  It looks like a little man with his hands held above his head.  The anti-backlash spring function is to stop the bobbin from continuing to spin when the quilter stops or hesitates.  Think of that perpetual motion that happens when a cat plays with a toilet paper roll, batting it and watching the paper spin to the ground.  The thread would continue to spin in the bobbin case, making loops on the back of the quilt where the quilter hesitates and then resumes quilting.  The anti-backlash spring fits into the bobbin case with four prongs.  There are two prongs on the left that fit into holes in the bobbin case that are set wide apart.  The other two prongs are on the right side and are set closer together. You will know you have the prongs correctly place when the round “head” part of the spring is sitting almost against the back of the bobbin case.  If it is more than a 1/16th of an inch away from the back of the bobbin case, the prongs are not set properly in place.  Press them with your fingernail until they snap into place.  Pre-wound bobbins with magnets have the same function as the anti-backlash spring.  Remove the backlash spring when using these bobbins.

On the side of the bobbin case is the tension strap.  Its function is to stop the thread from coming off the bobbin too quickly and to keep enough tension on the thread to lock with the needle thread.  There are two screws.  The larger one is the tension adjustment screw.  It requires very small increments to adjust tension, one or two minutes on a clock, at a time.  Move the screw right to increase tension and left to loosen the tension.  The small screw is a set screw that holds the strap in place.

On the opposite side from the tension strap is an opening that accommodates the needle as it comes down towards the hook that picks up the needle thread, pulls it around the bobbin case and creates a stitch.  It is important to place the bobbin case in correctly so this opening is at the top and secure.  The lever on the bobbin case is to hold onto while placing the bobbin case in the basket.  When the lever is opened, a curved finger slides in to keep the bobbin from falling out.

The little curled wire on the bobbin case is affectionately called the Piggy Tail.  The thread from the bobbin is pulled through the piggy tail to align it with the needle and add a bit of tension to the bobbin thread.  To place the thread in the piggy tail, while the bobbin is in the bobbin case and the thread in the tension strap, put the thread between the bobbin and the piggy tail and wiggle the thread.  In it goes as easy as that.

This industrial, M size, bobbin case has been in use for generations.  It is dependable and sturdy.  Keep it clean and avoid dropping it and the TinLizzie18 bobbin case will serve you well.

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