Service manual

S-4000 BH Omron
1-44
Released 05/2010
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E - MACHINE ADJUSTMENTS
14. THREAD TENSION
The thread tension influences the appearance of the buttonhole. A thread tension change may be
needed in the thread and fabric change. Check to be certain all parts, which contact the thread are
smmoth and polished with no burrs or sharp edges.
· By turning the tension knob clockwise, the thread tension increases.
· By turning the tension knob couter clockwise, the thread tension decreases.
NOTE: Too tight a thread tension can cause the unsightly appearance of the buttonhole when sewing
on a thin and elastic material.
The S4000 BH machine has 2 thread tensions. The first one ➊ influences the thread tension when the
first and the second rows of stitches are sewn, the second one influence the thread tension when the
bars are sewn.
1. Adjustment of the tension discs opening
The opening of the tension discs is preformed when the bars are sewn. When the tension discs are
opened:
a) it is possible to pull the thread from the spool when the cutting lever ➋ receives the impulse
for operation
b) by decreasing or increasing of the air flow it is possible to regulate the tightening of the last
loop in the sewn buttonhole
➊
➋