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Adjustment Procedure
Results of Improper Adjustment
Checking items:
* Check that the size of the needle thread loop is 1 to 2 mm (A) when
the lower looper blade point meets the needle center when sewing
two plies of cotton broad cloth with No. 90 spun thread.
How to perform adjustment:
○
Loosen the setscrew (C) of the needle thread guide (B).
○
Move the needle thread guide (B) up or down to make adjustment.
(The higher the needle thread take-up guide is raised, the larger the
needle thread loops will become.)
○
Retighten the setscrew (C).
(As the needle thread guide is moved up, the needle thread loop will be
larger.)
If the needle thread loops are
excessively large, the loops will fall
down to disable the lower looper to
scoop the loops, causing stitch skip-
ping. In addition, the looper blade
point prongs the needle thread,
resulting in needle thread fraying. (In
particular, lament thread which is
likely to untwine)
If the needle thread loops are
excessively small, stitch skipping
and needle thread fraying can be
caused. (In particular, the material
which cannot be fed smoothly)
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