Counter Knife; Pedal Pressure And Pedal Stroke - JUKI DDL-900B Instruction Manual

26. Counter knife

WARNING :
Be sure to turn the power OFF before the following work in order to prevent personal injury due to
unintentional starting of the sewing machine.
When sharpening again the counter knife ❶, extra special care must be taken on the handling of
the knife.
Fig A
❶
Oil Stone
* In the case the thread cannot be trimmed sharply, re-sharpen counter knife ❶ as illustrated in Fig. A be-
fore the knife has become dull and re-place it correctly.
1) Loosen setscrew ❸ of bobbin case opening lever ❷, and remove the bobbin case opening lever.
2) Loosen setscrew ❹, and remove counter knife ❶.
3) To install the counter knife ❶, follow the above procedure in reverse order.

27. Pedal pressure and pedal stroke

WARNING :
Be sure to turn the power OFF before the following work in order to prevent personal injury due to
unintentional starting of the sewing machine.
❶
❷
(1) Adjusting the pressure required to
1) This pressure can be changed by changing the
❷
2) The pressure decreases when you hook the
3) The pressure increases when you hook the
(2) Adjusting the pressure required to
❸
1) This pressure can be adjusted using regulator
2) The pressure increases as you turn the regulator
3) The pressure decreases as you turn the screw
(3) Adjusting the pedal stroke
1) The pedal stroke increases when you insert
– 18 –
❸
❶
depress the front part of the pedal
mounting position of pedaling pressure adjust
spring ❶.
spring on the left side.
spring on the right side.
depress the back part of the pedal
screw ❷.
screw in.
out.
connecting rod ❸ into the right hole.
❹