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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
dot2
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.
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