Service manual

S-4000 CAED Omron
1-37
Revised 10/2009
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Phone: [phone] (Service), [phone] (Spare Parts); Fax: [phone]
E - MACHINE ADJUSTMENTS
17. THREAD TRIMMING
The trimming mechanism ensures correct trimming of all treads after finishing
the last stitch. The trimming hook, which moves in the direction of the arrow
,
pulls both thread ends A, B. Once the hook is close to the uplift, it guides the left
side of the loop A on the knife edge. The thread is trimmed.
1. Adjustment of the trimming cylinder
a) tilt the machine head onto the support pin and close the air supply.
Push out the piston ➊ of the cylinder ➋ to the possible limit.
b) check that the lever ➌ does not overlap the surface of the plate ➍.
If the lever is above the surface, do the following:
c) loosen the screw ➏.
d) loosen the nut ➎ and by using some tools (pliers), turn the piston ➊
of the cylinder ➋ clockwise. It will ensure the lever ➌ is in the right
position.
e) tighten the nut ➎ and the screw ➏. Check, there is no axial play on
the shaft ➐ after the adjustment.
f) if there is some play on the shaft, loosen the screw ➏, move the
shaft ➐ to the left so that the lock ring 8 touches the cut in the plate
➌. Move the lever to the right until it stops and tighten the screw ➏.
16. THREAD TENSION
Correct thread tension affects the final appearance of sewing. The tension changes with the change of
material sewn. The thinner and the more elastic material is, the wider the thread tension must be opened.
When replacing any part affecting the thread passing,
check the smooth finish of surfaces getting in touch with
thread.
• Turn the tension knob ➊ clockwise to increase the
thread tension.
• Turn the tension knob ➊ counterclockwise to
decrease the thread tension.
NOTE: If there is too much thread tension when sewing
light and elastic materials, the workpiece can deflect in
the sewing area and the final look is not nice.
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