S-4000 LT
1-38
Revised 10/2004
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1 3 . T H R E A D D R AW- O F F
1.
A d j u s t m e n t o f t h e D r a w - O f f L e ve r Po s it io n
The correct adjustment ensures a long enough thread tail for starting the sewing of the next
buttonhole. Remove the covers because this mechanism adjustment is performed in the rear of the
head. Air supply is necessary for this adjustment.
a)
loosen the screw
➏
b)
the piston
➐
of the cylinder
➑
is in the home position (retracted). Move the lever
➒
to the pin
➓
with minimal clearance 0.1 mm. Tighten the screw
➏
c)
check the correct clearance adjustment by switching the valve
of the draw-off cylinder
(YV1).
2.
T h e t h r e a d e n d a d j u s t m e n t
If the first stitches are missing or the buttonhole is not sewn, follow the below mentioned steps:
a)
loosen the screw
➊
.
b)
turn the draw-off lever
➋
counter clockwise to increase the thread tail length; turn the
draw-off lever clockwise to decrease the thread tail length
3.
L o ckin g t h e s t it c h e s
If the skipped stitches problem appears during the sewing, follow the below mentioned steps:
a)
loosen the screw
➌
b)
move the thread take-up
➍
to increase the size of the needle loop
E - MACHINE ADJUSTMENTS