Operation Manual

Sewing
problems
and
solutions
These
machines
have
been
developed
for
easy
operation,
and
there
are
no
difficult
adjustments
to
be
made.
Sewing
problems
of
the
kind
described
below
may
occur
due
to
minor adjustment.
and
operation
errors.
They
can
easily be
corrected
by
following
the
instructions
below.
Problem
Cause
Solution
Needle
breakage
Needle bent
Insert
new
needle
or
point damaged
Needle not
fully
inserted
Insert
new
needle
correctly
(see
p.
29>
Material
pulled
Do
not
pull
material
during
sewing
Thread
breakage
incorrectly
threaded
Thread
corrcetly
(see
pp.
7-1
1
Thread
has
caught
Check
whether
thread
catches
at
the
reel
stand,
etc.
Thread tension
too
tight
Regulate
tension,
(pp.15—16)
Needle
not
fully
inserted
Insert
needle
correctly
(p.
29>
Incorrect
needle
used
Use
needle
system
1
30/705
H
Skipped
stitches
Needle
bent
or
point
Insert
new needle
damaged
Needle
not
fully inserted
Insert
needle
correctly
(p.
29>
Incorrect
needle used
Use
needle
system
1
30/705
H
Incorrectly
threaded
Thread
correctly
(pp.7-li)
Incorrect
stitch
incorrect
setting of
Set
thread
tensions
corformation
thread tensions
rectly
(pp.15—iS)
The
3-
or
4-thread
The
converter
is
in
its
Set
converter
in
its
right
overedge
seam
has
left
position
A
position
8
(see
p.
18>
an
irregular
ap- (see
p.
18>
pearance,
and
the
right
looper
thread
has
not
interlocked
in
the
seam
40