JUKI DDL-9000C-F Instruction Manual page 90

[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)
In the case any of the aforementioned problems occurs, the assist function which reduces the presser foot
pressure at the beginning sewing can be set by using the active presser lifting device.
* In the case the assist function is not used, adjustment should be carried out to allow the needle thread
placed between the presser foot and the material to smoothly come out from between them by decreasing
the presser foot pressure. (The recommended presser foot pressure is 30 N (3 kg) or less.)
Adjust the presser foot pressure and the sewing speed appropriately to prevent insufficient feed efficiency
due to jumping or other faults of the presser foot. Confirm the adjustment result by actually sewing the ma-
terial.
1. The amount of uplift of the presser foot above the throat plate varies according to the
material thickness of the item to be sewn and the presser foot pressure. Be sure to check
the actual condition before starting sewing.
2. If the adjustment value of the operating time of the AK-154 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 checking the
needle thread.
[How to set the active-presser assist func-
tion]
1) Enter the presser foot lift setting time with
"U290".
2) Press
Factory-set value : 20
❶
– 86 –
❶ to confirm the entered value.