– 10 –
4-8. Adjusting the thread take-up spring
❸
❷
❶
❹
1) Adjusting the stroke
Loosen setscrew
❷
, and turn thread tension
asm.
❸
. Turning it clockwise will increase the
moving amount and the thread drawing amount
will increase.
2) Adjusting the pressure
To change the pressure of the thread take-
up spring
❶
, insert a thin screwdriver into the
slot of thread tension post
❹
while screw
❷
is
tightened, and turn it. Turning it clockwise will
increase the pressure of the thread take-up
spring. Turning it counterclockwise will de-
crease the pressure.
Decrease
Increase
5. OPERATION OF THE SEWING MACHINE
A
B
C
1)
2)
3)
5-1. Sewing
[In case of the mechanical valve pedal]
1) Set a workpiece under the feeding frame and
depress pedal
A
of the pedal switch. Then the
feeding frame comes down.
When the foot is detached, the feeding frame
returns to its home position.
The lowering speed of the feeding frame
changes according to the depressing amount.
This is used when positioning the parts.
2) When positioning the workpiece and depress-
ing pedal
B
, the feeding frame comes down to
the bottom and holds the workpiece.
3) Depress pedal
C
when the feeding frame
comes down to the bottom and sewing starts.
[For the 2-step stroke pedal (PK47)]
* Refer to
