JUKI DDL-9000C-S Series Engineer's Manual page 79

Adjustment Procedure
The picker device is used in order to stabilize idling of the bobbin at
the time of thread trimming.
(Caution) When it is necessary to check how the picker ❻ is
adjusted, install the bobbin case and bobbin ❺ in the
hook first, then check the picker.
Checking the standard adjustment
1.
1. Check to make sure that the power switch is in the "OFF" state. Tilt
the sewing machine.
2. Bring thread trimming solenoid ❶ in the pull-in state by hand.
3. In this state, the standard adjustment value of the clearance between
picker link ❸ and picker arm ❹ is 0.5 mm. At this time, a clearance
of 0 to 0.3 mm is provided between bobbin ❺ and picker ❻.
2. Standard adjustment
1. Loosen picker link pin nut ❷ (9 mm). Carry out adjustment by mov-
ing picker link ❸ to the right and left.
2. After the adjustment, tighten picker link pin nut ❷.
3. Standard adjustment (Adjustment at the tip position)
1. Loosen picker setscrews ❼ (two pieces). Adjust the position of
picker ❻.
2. After the adjustment, tighten picker setscrews ❼ (two pieces).
Results of Improper Adjustment
◦ If there is no clearance between
bobbin ❺ and the tip of picker ❻,
picker ❻ strongly press bobbin
❺. As a result, the bobbin fails to
supply a required length of bob-
bin thread at the time of thread
trimming. In this case, the bobbin
thread is likely to be trimmed short
and thread slip-off at the beginning
of sewing is likely to occur.
◦ If there is an excessively large
clearance between bobbin ❺ and
the tip of picker ❻, thread required
for thread trimming may slip off the
tip of picker and the length of needle
thread remaining at the needle tip
after thread trimming will be short.
In addition, bobbin ❺ is likely to
idle frequently at the time of thread
trimming causing problems at the
beginning of sewing.
– 63 –