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1-2) An inappropriate needle, throat 2-A) The dimension A of the foot is Check whether the shapes of the A and B portions of the
plate, or presser is used. too large. Too much clearance presser and the C portion of the throat plate are appropriate.
Alternatively, the pressure of the on the underside of B interferes * For sewing tricot with chemical fiber thread: A < 0.8 mm
presser is too low. with pressing the needle thread Rs of B and C portions < 0.3 mm
when a sewing pitch is short. * For using chemical fiber thread: A < 1.2 mm,
B and C portions without clearance recommended
* For using cotton thread: smaller clearance at A, B and C
portions recommended unless there is no defective
thread tension
2-B) The clearance at the C portion
of the throat plate is too much.
1-3) The sewing material is likely to 3-A) The thread is not held and is Use a thinner needle or the T-type needle bar thread guide
hold sewing traces or loose. likely to be released because (B1418227T00).
the needle traces on the material
do not recover. Alternatively, the
thread is likely to be released
from a loose material.
3-B) The needle is too thick. The thinner the needle is, the better the situation becomes
unless no defective needle thread tension is found.
3-C) The needle hole of the throat Replace the current throat plate with a throat plate with smaller
plate is too large needle hole.
3-D) The pressure is too low. Use the presser stroke adjusting screw to increase the
pressure without decreasing the feeding force (or without
causing clogging).
1-4) The blade top of the hook does 4-A) The timing between the needle Check the needle bar height, and align it with the ruled line
not scoop the needle. and hook is inappropriate. on the needle bar. For sewing knitted cloth, lower the
(stitch skipping) needle bar slightly to delay the timing.
4-B) The tension and momentum of Decrease the tension and momentum.
the thread take-up spring are
too high.
4-C) The blade top of the hook is Reshape the blade top or replace the hook.
worn out.
4-D) The needle is inappropriately Adjust the needle inclination, or replace the needle if the
mounted. current needle is bent.
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