Adjusting The Knife Unit - JUKI DDL-9000C-S Series Engineer's Manual

Adjustment Procedure

4) Adjusting the knife unit

Adjustment of the knife unit
2.
1. Check to make sure that the power switch is in the OFF state.
Remove the gauge (presser foot, throat plate and feed dog) from
around the needle.
2. Tilt the sewing machine head.
3. Remove protective cover ❶.
4. Loosen loop spreading knife eccentric pin setscrews ❸ (two
pieces). Turn loop spreading knife eccentric pin ❷ with a flat-blade
screwdriver to finely adjust the rotational-direction position of loop
spreading knife ❹.
5. After the adjustment, tighten loop spreading knife eccentric pin
setscrews ❸ (two pieces).
6. Attach protective cover ❶ back in place.
5）Adjustment of thread trimming speed
The thread trimming speed has been adjusted to 300 sti/min at the
time of shipment. This means that the high-speed thread trimming has
been selected. (In the case of H type model, thread trimming speed
has been factory set to 220 sti/min.)
Depending on the type of thread to be used, the thread trimming speed
should be increased. On the other hand, in the case of using fragile
thread (such as a high-count filament type thread or cotton thread),
the thread trimming speed should be decreased to reduce damage
to the thread.
Thread trimming speed should be adjusted when appropriate accord-
ing to the sewing process.
[How to adjust]
❾.
1) Press
❶ to align the cursor on "U036". Input a thread
2) Press
trimming speed with
❷.
– 59 –
Results of Improper Adjustment
◦ Position of marker dot A on loop
spreading knife eccentric pin ❷
should be adjusted only from the
operator's side.