JUKI Sewing Machine - Adjusting the Thread Trimmer; AdjustNg the Thread TrMmer Cam TMNg; AdjustNg the NTAl PosTOn of the MovNg KnFe

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176
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1) Adjusting the engraved marker dot
Loosen knife drive arm clamp screw
4
, turn
knife drive arm
5
so that engraved marker dot
1
aligns with V groove
2
, and tighten the clamp
screw.
When V groove
2
in terms of engraved
marker dot
1
slips in the right-hand
direction, the blade section of moving
knife does not completely pass the blade
section of counter knife. As a result,
handling failure or thread trimming
failure will be caused.
When pulley cover engraved marker
dot
2
aligns with engraved marker dot
(colorless)
1
on the handwheel, the
timing is normal.
■
When the aforementioned normal timing is
improper, adjust it with the procedure below.
1) Remove the bottom cover and loosen thread
trimmer cam setscrews
7
.
2) Adjust engraved marker dot (colorless
1
) on
the handwheel to engraved marker dot
2
on the
pulley cover.
3) Pressing drive block
3
to the right-hand,
engage cam
4
with roller
5
.
4) Turn cam
4
only in the reverse direction of
the rotating direction of the hook driving shaft
without turning hook driving shaft
6
.
5) Press cam
4
to roller
5
at the position where
cam
4
does not turn and tighten cam setscrews
7
.
(1) Adjusting the thread trimmer cam timing
1) Turn the handwheel to the position where the thread
take-up lever comes a little before its upper dead point.
2) Turn ON the thread trimmer solenoid and slide the
roller to the thread trimmer cam to engage them with
each other referring to
"21-7 Performing the output
signal check"
, and slide the roller to the thread
trimmer cam to engage with each other.
3) In the state as it is, turn the handwheel in the normal
operating direction and in the reverse direction. Then
turn the handwheel until the handwheel stops.
24-5 Adjusting the thread trimmer
5
6
8
4
7
3
Slide
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Engraved marker
dot (colorless)
1
Engraved
marker
dot
2
3
2
1
4
5
(2) Adjusting the initial position of the moving knife
The initial position of the moving knife is the position where engraved marker dot
1
on the hook shaft
base aligns with V groove
2
on the moving knife base.
At this time, end
6
of the cam roller is higher by 1.7 mm than hook driving shaft center
7
.