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BA_170-22D_A14_180704_en
5.5
Problems during sewing and possible solutions
A T T E N T I O N !
Switch off machine electrically and confirm that the
machine is really in standstill position by operating the
treadle for the motor control.
Otherwise danger of finger bruises and needle
throughstitches.
•
Thread tears
Possible reasons:
-
sharp edges or grooves in the needle guide, thread take-up, looper
or needle eye after a long time of machine operation
-
looper or loop stroke are not set correctly, therefore the thread loop
is not always caught
-
thread tension set too high
-
thread size does not correspond to needle size (thread is too thick)
Solutions:
-
replace or polish the damaged parts
-
re-adjust looper and/or loop stroke
-
re-adjust thread tension, check thread course
-
choose the correct thread size
Please observe:
thread course, thread, needle plate with plunger and
cloth retainer, needle and thread tension should always
be set and chosen according to the material to be
sewn.
•
Inexact needle penetration
Possible reasons:
-
Incorrect needle system
-
worn out or damaged needle
-
wrong pressure or setting of cloth retainer
-
wrong setting of needle plate or needle guide
-
damaged or worn out needle glide plate
-
wrong needle size (too thin)
-
damaged plunger or wrong plunger setting
solutions:
-
replace damaged needle, choose suitable needle size
-
check settings and re-set, if necessary
-
replace needle glide plate
Summary of Contents for 170-22D
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