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1. Adjustment of bobbin thread cam
1) Open the center top cover , loosen the setscrew , and remove
the cam thread path base .
2) Turn the pulley counterclockwise and confirm whether the first
bobbin thread cam setscrew stays on the same line with the first
setscrew of the pully .
If the bobbin thread cam setscrew seems to be displaced, loosen
two setscrews and and turn the bobbin thread cam forward
and backward for adjustment. Then, tighten the setscrew .
Subsequently, tighten another setscrew .
(Caution) At the time of bobbin thread cam adjustments, do
not move the bobbin thread cam to the right and left.
If it is moved to the right and left, the bobbin thread
cam may come in contact with the right/left side face
of the cam thread path base groove.
3) Install the cam thread path base so that it does not touch the
right and left faces of the bobbin thread cam . Then, tighten the
setscrew .
(Caution) The bobbin thread cam can be adjusted through the
peep window. However, since the inside is dark, a proper
light (pen light or the like) should be used during
adjustments.
o If the standard position is not
secured for the bobbin thread cam
, this can be a cause of stitch
skipping.
Adjustment Procedures Results of Improper Adjustment
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