–
8
–
Standard Adjustment
Results of lmproper Adjustment
™
When length of rocking thread take-
up
2
is lengthened, needle thread is
tightened.
(Caution) When lengthening rocking
thread take-up
2
, check
whether it comes in contact
with the thread take-up cover.
™
When length of rocking thread take-
up
2
is shortened, needle thread is
loosened.
™
When installing position of rocking
thread take-up
2
is raised, needle
thread is loosened when the needle
bar thread take-up is used, and needle
thread is tightened when the needle
bar thread take-up is not used.
1. Length of the rocking thread take-up
(1) Loosen screws
1
and move rocking thread take-up
2
to the right
or left to adjust the length.
2. Position of the rocking thread take-up
(1) Loosen screw
5
and move rocking thread take-up
2
up or down
to adjust the position.
(Caution) When adjusting the position of rocking thread take-up
2
,
adjust the rocking thread take-up to the same plane of the
edge of rocking thread take-up shaft
3
and fix it so that
spreader thread take-up
6
and spreader thread guide
7
do not come in contact with each other.
3. To adjust the timing of the rocking thread take-up
2
, remove the top
cover, loosen setscrew
9
in the rocking thread take-up ball arm and
move the position of rocking thread take-up ball arm
8
to and fro.
(1) Standard adjustment figure is the position where the rear end (anti-
operator’s side) of rocking thread take-up ball arm
8
aligns with engraved
marker line
!0
on rocking thread take-up shaft
3
. (As the standard at this
time, note that the clearance provided between the rear end of rocking
thread take-up ball arm
8
and thrust collar
!1
is 4 mm.)
(Caution) 1. When loosening screw
9
in rocking thread take-up
ball arm
8
, there is a case where rocking thread take-up
2
rotates by its weight. After the adjustment, be sure to
check the rocking position (flush at the lowest position)
of rocking thread take-up
2
.
2. When moving rocking thread take-up ball arm
8
to the
operator’s side, adjust rocking thread take-up ball arm
8
within the range where it does not come in contact
with rocking thread take-up bushing
!2
(operator’s side).
4. Relation between timing of rocking thread take-up and needle
thread loop
When needle bar thread take-up is used
Loop becomes small.
Loop becomes large.
When needle bar thread take-up is not used
Loop becomes large.
Loop becomes small.
Advance timing
(Move to anti-operator’s side.)
Delay timing
(Move to operator’s side.)
Adjusting procedure is the same as step 3. Loosen setscrew
9
in rocking thread take-up ball arm
8
and adjust
the position of rocking thread take-up ball arm
8
.
(Caution) Adjust the timing of rocking thread take-up
2
each time in accordance with thread used or conditions.
