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Threading the sub tension adjuster
Feed it between the thread guide plates and through
the hole in the axis of the thread adjusting device.
Wrap the thread around the detector roller (V-shaped
groove) one time.
Threading the thread detector roller
Thread guide disk
(through the center
of shaft)
Thread detector roller
1 time rotation
Threading the main tension adjuster
Wrap the thread 1.5 times around the rotary tension
disk (V-shaped groove.)
Insert the upper thread, which comes from the hole at
the needle bar bottom, into the needle.
Threading around the needle
Rotary tension disk
1.5 times rotation
Passing the needle bar groove
