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RE-LOADING THE
BOBBIN CORRECTLY
The
bobbin will need to be replaced frequently, allowing only 30,000 to
60,000 stitches per spool. This has to be done correctly every time.
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1. Ensure bobbin turns clockwise. Pull thread through
this slit. |
2. Feed
thread through eye
at the end of the metal tension flap.
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4. Perform
a drop test to check
tension: like releasing a yo-yo as shown on the right,
follow these steps:
a. Hold the loaded bobbin case
by the free end of the thread - let it hang about 6-12
inches from your fingertips
b. Dip your hand downwards and bring
to a quick stop (but not so suddenly the bobbin falls
out of the bobbin case)
You should cause enough
downward momentum that, after your hand stops, the bobbin case
should continue,
unspooling
downwards.
c. Watch for 1 of 3 things to happen:
Correct tension: Bobbin case unspools slightly and
stops.
Too Tight: Bobbin case does not unspool at all, no matter
how many times you try the "drop" test.
Too Loose: Bobbin case unspools continuously without you needing
to dip your hand.
d. Adjust the bobbin tension
by turning the larger of the 2 screws at the base of the tension
flap (right) and
perform the drop test again until the tension is correct.
If you happen to have a bobbin tension gauge,
you'll find that this test should consistently set the bobbin
tension correctly at 23 to 27 grams tension. |
adjusting bobbin tension |
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5.
Pass the bobbin thread through the wire loop (shaped like an
inverted "U" at the front of the bobbin case) and allow 4-6
inches to hang from it, down across the front of the bobbin
case. |
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6. Insert bobbin case (into
the basket of the rotary hook) and close the bobbin case door.
Be sure that the bobbin case is inserted COMPLETELY or
the machine will fail to sew. |
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