Service manual

S-4000 BH Omron
1-43
Released 05/2010
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E - MACHINE ADJUSTMENTS
13. THREAD DRAW-OFF
1. The 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
machine head. The 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 Ò to the pin ➓
with minimal clearance 0.1 mm. Tighten the screw ➏
c) check the correct adjustment by switching the valve of the draw-off cylinder (YV1)
2. Setting the thread tail length
If the missing stitches appear at the beginning of the sewing 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. Lock
ing the stitches
If the skipped stitches problem occurs during sewing, follow the below mentioned steps:
a) loosen the screw ➌
b) move the thread take-up ➍ down to increase the size of the needle loop.