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(2) With regard to thread trimming
One or several stitches
Thread remaining at the Check the routing of Thread the needle thread correctly.
skip at the start of sewing.
needle top after thread needle thread. Adjust so that abnormal needle
trimming is short. thread tension is not applied.
Thread tension given Decrease the tension given by
by the tension controller
the tension controller No.1.
No.1 is too high.
Check the rising amount
Adjust so that the disk is raised
of the thread tension by means of the thread release
disk No.2 at the time solenoid.
of thread trimming.
Thread trimming timing
Refer to “(22)-6) Threader cam
is excessively advanced
. timing”.
There are scratches on
Polish with buff or replace the
the moving knife and part.
the hook.
Presser foot drops from
Perform thread trimming on cloth.
cloth at the time of
thread trimming.
Bobbin thread is not Position of the clamp Refer to “(22)-1) Position of the
clamped. spring. counter knife and the clamp
spring”.
Pressure of the clamp Refer to “(22)-1) Position of the
spring is too low. counter knife and the clamp
spring”.
There are scratches Replace the clamp spring with a
on the clamp spring. new one.
Needle thread removes
Increase or decrease the tension
bobbin thread. of the tension controller No.1.
Needle is too thick. Replace the needle with a thinner
one.
Needle hole in the feed Replace the feed dog with an
dog is too large. optional one with small needle
hole.
Pressure of the presser Increase the pressure of the
foot is too low. presser foot.
Stitches are too small. Do not pass thread through the
thread presser section of the
thread guide on the needle bar.
1
Troubles Causes Checking Corrective measures
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