– 4 –
5. ON THREADS
6. HOW TO PASS THE BOBBIN THREAD
WARNING :
To protect against possible personal injury due to abrupt start
of the machine, be sure to start the following work after turning
the power off and ascertaining that the motor is at rest.
7. HOW TO THREAD THE MACHINE HEAD
WARNING :
To protect against possible personal injury due
to abrupt start of the machine, be sure to start
the following work after turning the power off
and ascertaining that the motor is at rest.
For the needle thread, left-twist thread should be used. For the bobbin thread,
either left-twist or right-twist thread can be used.
To verify the twist of thread, hold the thread as shown in the fi gure and if the
thread is twisted toward front by the left hand and is wound tight, it is a right-
twist thread. On the contrary, if the thread in the right hand is twisted toward
front and is wound tightly, it is left-twist thread.
Open the lever of the sewing hook, insert the bobbin and knock down the lever
to its original position.
If the bobbin thread is pulled out from the groove of the sewing hook, the thread
will pass under the bobbin thread tension spring.
Pull out the bobbin thread about 5cm (about 2”) on top of the slide plate.
Pass the needle threads in order shown in below.
As you face the machine, left side needle thread should be
passed from
❶
-
⓭
(Left thread tension disc
→
upper hole of
take-up lever
→
left needle)
The right side needle should be passed, in order, from
-
-
-
❺
-
❽
-
-
❿
-
⓫
-
-
(right thread tension
disc
→
lower hole of take-up lever
→
right needle)
❶
❽
❿
⓫
❷
❸
❹
❺
❻
❼
❾
⓬
⓭
– 5 –
8. THREAD TENSION
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the following
work after turning the power off and ascertaining that the motor is at rest.
* Needle thread tension
The thread tension of the right side needle can be adjusted by the right side
thread tension nut
❶
and the left side needle thread can be adjusted by the left
side thread tension nut. Turn the nut to right to make the needle thread tension
stronger and to left to make the tension weaker.
* Bobbin thread tension
The thread tension of the bobbin thread can be adjusted by turning the thread
tension screw of the bobbin case holder.
If the screw is tightened, the tension becomes stronger and if it’s loosened, the
tension becomes weaker.
* Thread take-up spring
To adjust the strength of the thread take-up spring, loosen the thread take-up
spring shaft screw
❶
, and turn the thread take-up guide shaft
❷
gently toward
left. To weaken the tension, rotate it toward right. After the adjustment, tighten
the screw
❶
. To adjust the stroke of the take-up spring, loosen the stopper set
screw
❸
and move the stopper
❹
to right and left. If the stopper is moved to-
ward right, the stroke gets bigger.
Thread tension screw
❶
❷
❶
❷
❸
❹
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