JUKI MOL-254 Engineer's Manual page 23

Adjustment Procedures
○ Determine the position of the thread trimmer cam and
tighten screw No. 1
upper face of the sewing machine.
Turn the main shaft by 1/4 in the normal direction of
rotation, and similarly, tighten screw No. 2
upper face of the sewing machine.
(Loosen the screws in the thread trimmer cam in the order
→
of .)
① Tilt the machine head.
② Turn the main shaft to fit thread trimmer roller
supporting run section
trimmer cam.
③ Loosen nut
and loosen thread trimmer link stopper screw
up to the position where the screw is away from section
of the thread trimmer connecting rod.
④ Press cam follower
and lightly fit thread trimmer roller
cam. (The roller does not enter the groove in the cam.)
⑤ Start tightening thread trimmer link stopper screw
Top end of thread trimmer link stopper screw
contact with section
further tightening the screw, cam follower
direction of the arrow mark (←), then thread trimmer roller
which has been lightly pressed enters the groove in the
thread trimmer cam.
⑥ Further, tighten by 1/2 turn thread trimmer link stopper
screw from the time when thread trimmer roller
entered the groove in the thread trimmer cam, and tighten
nut to fix the screw.
At this time, fix thread trimmer link stopper screw
that it turns no further and tighten nut
of the thread trimmer cam from the
of the groove in the thread
in the direction of the arrow mark
to the thread trimmer
of the thread trimming rod. When
turns in the
.
16
−
Results of Improper Adjustment
○ Failure of thread trimming will
occur.
○ Machine-lock will occur at the
start of sewing or at the time of
from the thread trimming.
○ Return to the initial position of
the thread trimmer mechanism
is delayed, and defective thread
tightness of the first stitch at the
start of sewing will occur.
(Caution)
When machine-lock occurs,
check the play of main shaft
in the axial direction, position
and timing of the thread
t r i m m e r c a m , o r r e l a t e d
components.
○ Failure of thread trimming will
to
occur.
○ Machine-lock will occur at the
start of sewing or at the time of
thread trimming.
○ Return to the initial position of
the thread trimmer mechanism
is delayed, and defective thread
tightness of the first stitch at the
start of sewing will occur.
.
(Caution)
comes in
When machine-lock occurs,
check the play of main shaft
in the axial direction, position
and timing of the thread
t r i m m e r c a m , o r r e l a t e d
components.
has
so
−