I) Needle being bent.
2) The op
er
ation
of
feed d
og
being n
ot
well regulated in 1) Needle to
be
r
ep
laced by another
of
proper size.
reference to the motion
of
2) Readjusting the timing to feed
dog
in
r
es
pect to the
needle.
needle.
Breakage
of
3) Setting-up
of
the pres
se
r 3) To make both the centre
of
the hole
of
the presser
4
n
ee
dle
foot foot and the
ce
ntre of the eyel
et
of
the throat.
4) The problem
of
the timing 4) The positioning & the timing
of
the needle gua
rd
to
of
needle guard remaining be taken into account.
un
solved 5) Relax
in
g needle thread
5) Needle thread tension being 6) Appropriate nee
dl
e to be used.
too high.
6) Needle being too thi
ck
.
L
Thr
ead tension being too
high.
2
The problem
of
the timing
l . Decreas
in
g thread tension, esp. tension
of
bobbin
of
the bobbin thread cam
for thread guiding failing
thread.
to be solved.
2.
Readjosting of the very cam sa
id
to solve
th
e timing
5 Puckering
3 The problem
of
surface
problem.
finish arising from bobbin
3. Surface finishing all the parts on
th
e thread guide.
thread going through the
4. Thming
co
unter-clockwise the pressure-regulating
parts on
th
e thr
ea
d gui
de
.
screw.
4 The force on the presser
foot being too great.
-15-
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