86
9-1-2022
APQS.com
Machine Operation
Bobbin Case Brake Spring
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Bobbin Case Brake Spring Removal
To use magnetic bobbins, you must remove the bobbin brake
spring from your bobbin case. Use a small screwdriver or
other flat tool to gently pry the brake spring out of the case.
Put the spring in a safe place, and reinsert it when you switch
to any other bobbin style (it’s a good idea to purchase a
second bobbin case if you like the magnetic core bobbins so
that you can leave the brake spring out of the case
permanently on one of them).
•
Bobbin Case Brake Spring Replacement
To reinsert the brake spring into the bobbin case, position it so that the small “fingers” point out. These will
be slightly raised compared to the rest of the brake spring. In the photos that follow, the Smart Bobbin
case (Photo A below) has a brake spring that has two straight pieces of metal that look like fingers bending
slightly up from the bottom of the case. The Big Bobbin case in Photo B has U-shaped fingers that also
bend up slightly. These “fingers” apply pressure on the bobbin once it is inserted into the bobbin case;
it will stop the bobbin from over-spinning when you stop sewing or change directions.
Align the shorter “cut out” edge or rounded edge of the brake spring with the cut-out opening in the
bobbin case as shown below, making sure the brake “fingers” point out away from the case. Use a small
screwdriver to force the outermost “pins” on the spring back into the slots that are on the outer rim of the
bobbin case. The brake spring should snap firmly in place with the small brake fingers facing outward.
For magnetic core bobbins only!
No Brake Springs
Depending on the size of bobbin case you have, your
bobbin case brake spring will look like either example
above. The one on the left is from a Style “L” bobbin
case and the one on the right is for a Style “M”
bobbin case.
Photo A
Photo B
