Trouble
Case (1)
Case(2)
Check and Corrective measures
Page
20.
Uneven
material lead
Presser fool pressure
The
presser foot pressure
Is
too
high.
Reduce
the presser loot pressure except for the uneven
material
feed
due
to
packering,
Presser
foot
The
hinge is
too
stiff.
Remove
the sllffness provided
no
hinge
play
is
produced.
Scratches
on
or dafective
flnlsh
on
the
presser loot
sole
Buff the presser foot sole for good surface finish.
produce
friction
between lhe presser
foot
and
materials.
TIit of
feed
dogs
The
front is too high.
Make the front down. However, be sure to align the
24
differential feed dog wllh
the
main feed dog.
Height
of
feed
dogs
A different
In
level exists between the main teed
dog
Eliminate
the difference
In
level.
24
and
dilferenlial
feed
dog.
Adjustment ol differential
feed
The
differential
feed
has
been
improperly adjusted.
Provide differential feed suited to
the
material.
21.
Puckering
Needle
The
needle
is too thick.
Use
a
thin
needle
as
much
as
possible.
(Malnly
concemed
with
double chain
stJIch)
Thread
The
thread
used
is
too
thick.
Use
a thin needle
as
much
as
poSSlble.
Thread tension
Bolh
the
needle thread
and
looper thread tensions are
Reduce
the both thread tensions to a minimum.
00
too
high.
c.n
Throat plate
The
throat
plate has a large
needle
hole.
Replace
the
throat plate
with
one
with
a small needle hole.
Thread
cam
timing
The
thread
cam
timing is too late.
Advance the cam timing. Refer to !he related Standard
Adjustment.
Feed
dogs
The leading edge of the feed dog teeth has been
Replace
the feed
dog.
rounded
off.
A difference
in
level exists
between
lhe
main
feed
dog
Ellmlnate such difference in level.
24
and
differential
feed
dog.
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