JUKI DDL-9000C-S Series Engineer's Manual page 65

Adjustment Procedure
5) Response to problems occurring at the beginning of
sewing
(Caution) With respect to the memory switch settings, a sewing
speed of 250 sti/min is recommended for "U286 Sewing
speed during thread presser operation", and an angle
of 720 degrees is recommended for "U292 Soft-start
resetting angel when the thread presser operates".
In the case of carrying out shorter-thread remaining thread trimming
(when condensation is placed in ON), set values of the condensation
pitch and the number of stitches are adjustable. Adjust those set values
appropriately according to the item to be sewn.
5)-1. DDL-9000C-S
[Setting the number of condensation stitches]
1) Select "U280" by pressing
❷ and enter the number of condensation stitches
2) Press
at the end of sewing for shorter-thread remaining thread trimming.
(Factory-set value: 2)
3) Confirm your entry by pressing
displayed.
[Setting the condensation pitch]
1) Select "U281" by pressing
❷ and enter the condensation pitch at the end of
2) Press
sewing for shorter-thread remaining thread trimming.
(Factory-set value: S type 0.3; H type 0.5)
3) Confirm your entry by pressing
displayed.
❺ ❶ ❷ ❻
❶. Press ❺.
❻. Then, the sewing screen is
❺ ❶ ❷ ❻
❶. Press ❺.
❻. Then, the sewing screen is
– 49 –
Results of Improper Adjustment
◦ So-called "bird's nest phenomenon"
is reduced by increasing the pitch
of the first stitch at the beginning of
sewing.
◦ If the condensation pitch is de-
creased, the phenomenon where
the needle enters the same needle
entry point will likely to occur, result-
ing in unstable formation of thread
loop at the time of thread trimming.
As a result, thread trimming fault is
likely to occur. It is therefore nec-
essary to adjust the condensation
pitch carefully. (The needle entry
phenomenon differs according to
the material to be sewn and the
needle count, the pitch should be
increased if thread trimming failure
occurs.)