3)
Important points in adjustment
CD
Increase the thread take-up amount of the needle thread take-up lever.
Refer to
the
adjustment values related to the needle thread guide and needle thread take-up lever.
® Reduce the feed of the looper threads. (Mainly lower looper thread)
Set J,
K,
Land
M for
the
soft chain distances.
Fine adjustment of J and M is required to produce even stitches.
(3)
Adjsut the thread tension while checking the appearance
and
touch of the stitches produced.
1)
Minimize the needle thread tension
as
far
as
satisfactory tightness of needle thread stitches
is
obtained.
2) Increase the upper looper thread tension
as
much as possible.
© If the chain:.off thread does not stretch satisfactorily, and
if
it
is
not satisfied, proceed with the
following.
1) Increase the upper looper thread tension.
2)
Further increase distances J
and
K.
3) Further increase the upper looper thread tension.
4)
Increase the lower looper thread tension to a maximum
as
far as good tightness
of
needle
thread stitches is maintained.
5) Increase the thread take-up amount. If the needle thread
is
poorly tensed, increase the needle
thread tension.
@ Fine adjustment for producing stitches with better appearance
and
touch
1) If the knotting point varies at high or low sewing speed, slightly reduce
L,
and increase the
lower looper thread tension.
2) If a
knot
is
made
at
a high point, increase J and
I.
3) If the needle thread
is
likely to break, decrease the thread take-up amount
and
lower the needle
thread tension.
®
Pay
attention
to
the following
1) Minimize the needle thread tension as far as satisfactory tightness of needle thread stitches is
obtained.
2) The knot of upper
and
lower looper threads should be made near the upper edge of a material.
3) Minimize
the
lower looper thread tension as far
as
even stitches are maintained.
4) For a safety stitch machine, adjust the soft chain making mechanism
so
that uniform chain-off
thread
is
produced during double-chain stitching and overlocking.
Upper
looper
thread
guide (middle)
Upper looper
thread
guide
(upper)
G K
17
5
14 Upper looper thread guide (right)
Lower looper
thread
guide
Lower
looper thread
tako-up
Soft chain stitches
The value given
in
( ) parentheses
is
the
adjustment
value
for
the
safety stitch machine. (Unit : mm)
When the chain-off
thread is pulled.
c:::>
~saess:
Looper
thread should not be
loosened and stretch well
Standard stitches
When the chain-off
~lftf'li"trw'll"'I
//
~
thread
is
pulled.
c:::>
OiO\tmll!U~rna:
:ti
The looper thread loosens
-65-
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