– 16 –
If the knife does not cut thread sharply, immediately
re-sharpen counter knife ❶ as illustrated in Fig. A and
re-install it properly.
1) If the mounting position of the counter knife is
moved in direction A from the standard mounting
position, the thread length after thread trimming
will be increased accordingly.
2) If the mounting position is moved in direction B,
the thread length will be decreased accordingly.
a
Moving knife
b
Center of needle
c
Standard : 4.0mm
❶
A
B
a
❶
b
c
25. Cunter 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.
Adjust the force required to operate the foot pedal
Spring A : Downward force adjustment
Bolt B : Heeling back force adjustment
Hole C : Pedal stroke adjustment
For General Application
B
C
A
26. 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.
When sharpening again the knife blade, extra special care must be taken on the handling of the
knife.
Fig A
Oil Stone
[DDL-8100B-7R]
❸
❷
❹
❶
❶
Fig A
* 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 ❷ of bobbin case opening lever ❶, and remove the bobbin case opening lever.
2) Loosen setscrew ❹, and remove counter knife ❸.
3) To install the counter knife, follow the above procedure in reverse order.
4) When attaching the bobbin case opening lever, tighten the setscrew while pressing the lever in direction A.
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