Adjustment Procedure
Results of Improper Adjustment
4) Response to problems occurring at the beginning of
sewing
• In the case needle thread breakage occurs when using a thin thread
or fragile thread
• In the case needle thread is not tucked on the wrong side of material
• In the case needle thread breakage occurs when starting sewing
from the material end (such as sewing the material with needle thread
tucked on the undersurface of material)
If any of the aforementioned problems occurs, the assist function which
works to reduce the presser foot pressure at the beginning of sewing
can be set by using the auto-lifter device
❹
(AK-154)
* The AK-154
❹
can be optionally installed. (Part number: 40174617)
4)-1. DDL-9000C-S
When installing the auto-lifter device
❹
(AK), the function of auto-lifter
is actuated.
1) Turn ON the power switch.
2) Press
❾
.
❾
3) Move the cursor to
”
U290
”
by pressing
❶
. Input the lifting
time using with
❷
.
❷
❶
Factory-set value : 20
Adjustable range : 0 to 50
The longer the lifting time is increased, the higher the presser foot
sole is brought up above the throat plate.
(Caution) The amount of uplift of the presser foot above the
throat plate varies according to the material thick-
ness of the item to be sewn and the presser foot
pressure. Be sure to check the actual condition
before starting sewing.
◦ The AK-154 device
❹
is exclusive
for the DDL-9000C-S.
◦ In the case the AK-154
❹
is not
used, the presser foot pressure
should be reduced to allow the nee-
dle thread to be released smoothly.
(The recommended presser foot
pressure is 30 N (3 kg) or less.)
Adjust the presser foot pressure
and the sewing speed appropri-
ately to prevent insufficient feed
efficiency due to jumping or other
faults of the presser foot. Confirm
the adjustment result by actually
sewing the material.
◦ If the adjustment value of the op
-
erating time of the AK-154
❹
is
increased while the presser foot
pressure is high, the operating
noise will become larger. Adjust the
adjustment value of the operating
time of the AK-154 and the pressure
foot pressure while visually check-
ing the needle thread.
❷
❶
– 45 –
