Service manual

S-4000 ISBH+I Omron
Revised 03/2009
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13. THREAD DRAW-OFF
1. Adjustment of the Draw-Off Lever Position
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. The thread end adjustment
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. Locking the stitches
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