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