Service manual

S-4000 BH Omron
1-49
Released 05/2010
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E - MACHINE ADJUSTMENTS
16. THREAD TRIMMING
Trimming mechanism ensures the correct thread trimming after sewing the last
stitch. A the trimming hook moves in the direction of arrow, both thread loop
legs A and B are pulled forward. When the thread hook approaches the end of
the stroke, leg A contact the trimming knife, cutting the thread.
1. Trimming cylinder adjustment
a) tilt the machine head onto the rest pin and close the air supply.
Extend the piston ➊ of the cylinder ➋ to the maximum position.
b) check to be certain that the cylinder does not push the lever ➌ too
high and into contact with the bedplate casting ➍. If no clearance
ex
ists, adjust as described in c, d, and e below:
c) loosen the screw ➏
d) to obtain the correct position of the lever ➌, loosen the nut ➎
and turn the cylinder piston ➊ in or out as needed
e) tighten the nut ➎ and the screw ➏. After this adjustment check if
no axial clearance exists on the shaft ➐.
f) if the axial clearance exists on the shaft, loosen the screw ➏,
move the shaft ➐ to the left so that the locking ring ➑ touches
the recess in the plate ➌. Move the lever to the right and tighten the
screw ➏.
2.
The trimming hook adjustment
a) push the piston ➊ of the trimming cylinder ➋ to the maximum
position and loosen the screw ➒ of the trimming actuator ➓.
b) turn the trimming actuator ➓ and set the clearance 1.0 mm
between the throat plate and the point of the trimming hook.
c) tighten the screw ➒ of the trimming actuator ➓.
d) open the air supply and check by switching the valve of the
trimming cylinder if the actuator ➓ does not hit the bedplate casting.