－
48
－
Narrow
(Tension release link)
Widen
(Thread
tension disk)
❶
❷
❺
❹
❸
1) Remove the top cover. Make sure that ten-
sion release pin
❸
rides on tension release
notch
❹
.
2) If the pin does not ride on the notch, push
cam follower
❺
by hand to the
⇨
direc-
tion, and rotate the main shaft in the correct
direction to make a state as illustrated in the
gure.
3) Under the state as illustrated in the gure,
loosen setscrew
❷
in the tension release
adjusting arm. By moving tension release
adjusting arm
❶
to the left or right the rising
amount of the thread tension disk will change.
S type : 0.6 to 0.8 mm
H type : 0.8 to 1.0 mm
If the rising amount is insufcient, the
length of the remaining thread after thread
trimming will be not stable. If the rising
amount is excessive, after releasing the
rising of the thread tension disk, the disk
closing will be defective.
7-5. Adjusting the rising amount of the thread tension disk
❶
❷
❸
1) Adjust so that thread breakage detector plate
❶
is always in contact with thread take-up
spring
❷
in the absence of needle thread.
(Slack : approx. 0.5 mm)
2) Whenever the stroke of thread take-up spring
❷
has been changed, be sure to readjust
thread breakage detector plate
❶
. To make
this adjustment, loosen screw
❸
.
7-6. Thread breakage detector plate
Adjust so that thread breakage detec-
tor plate
❶
does not touch any adjacent
metallic parts other than thread take-up
spring
❷
.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
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