Method Of Confirmation; Method Of Standard Adjustments (Adjustment Of Clearance); Method Of Standard Adjustments (Adjustment Of Tip Position) - JUKI DDL-9000B-SH Engineering Manual

Adjustment Procedure

1. Method of confirmation

(Cautions) Confirmation should be carried out under the
conditions that the hook and bobbin case plus bobbin
are installed.
(1) Let the sewing machine fall down and loosen two stopper plate
setscrew to remove the stopper plate
A
(2) Assume a condition that the thread trimmer solenoid
by hand.
(3) In this state, the standard clearance is 0.5mm at the stepped part
between the picker link
clearance between the bobbin
(Important) When standard adjustments are completed, an oblong
clearance is secured in the picker link
indispensable return motions (damper function) can
be performed.
(4) The position where the picker
center of Character U of the bobbin case.
[Type I]
(5) Fix the stopper plate
[Type II]
(5) Apply a slightly increased amount of appropriate grease (JUKI
Grease A) to Part
E
stopper guide .
D
(6) Insert the stopper spring
Part of the stopper plate
E
(7) Fix the stopper plate

2. Method of standard adjustments (Adjustment of clearance)

(1) Let the sewing machine fall down.
(2) Assume a condition that the thread trimmer solenoid
by hand.
(3) Loosen the picker link pin nut
to the right and left for adjustment.
(4) After the completion of adjustments, fasten the parts assuredly.

3. Method of standard adjustments (Adjustment of tip position)

(1) Let the sewing machine fall down.
(2) Assume a condition that the thread trimmer solenoid
by hand.
(3) Loosen two picker setscrews
(4) After the completion of adjustments, fasten the parts assuredly.
.
B
and the picker arm
and the picker
enters should stay almost in the
with the two stopper plate setscrew
B
of the stopper plate
B
and the stopper guide
C
.
B
with two stopper plate setscrews
B
(9mm) and move the picker link
to adjust positioning.
Results of Improper Adjustment
is attracted
When there is no clearance of the
. At that time, the
picker
is 0 to 0.3mm.
o Since the bobbin
and
When there is a large clearance of
.
A
the picker
o The needle thread is disengaged
and Part of the
F
in this order in
D
o A bobbin
.
A
is attracted
is attracted
– 59 –
:
is pressed too
much, the bobbin cannot make
a required turn at the time of thread
trimming and the bobbin thread is
cut short as a result. Therefore,
needle thread castoff tends to
occur at the beginning of sewing.
:
from tip of the picker at the time
of thread trimming. Thus, the
needle thread remaining at the
needle tip becomes short after
thread trimming.
idling phenomenon
occurs frequently and this can be
a possible cause of problems at
the beginning of sewing.