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Adjustment Procedures
™ Lateral position
1. Loosen setscrews 1.
2. Move cylinder base 3 so that the clearance provided between
threading plate 2 and the end of the groove of machine arm is
1±0.5 mm.
3. Tighten setscrews 1.
™ Adjusting the stroke of the threading plate
1. Remove the air hose connecting to the regulator and cut off
the air.
2. Loosen nut 4.
3. Turn the shaft section of cylinder 5 and adjust so that the
distance from cylinder 5 to cylinder knuckle 6 is 22 to 23 mm
(when the cylinder shaft is stretched).
4. Tighten nut 4.
™ Turn the shaft in the direction A, and the distance is
shortened and the protruding amount of threading plate 2
is decreased.
/ Decrease the distance when stitch skipping occurs at
the start of sewing.
™ Turn the shaft in the direction B, and the distance is
lengthened and the protruding amount of threading plate
2 is increased.
/ Increase the distance when needle thread remains on
cloth at the start of sewing.
* Perform the fine adjustment with the tension controller No. 1
when stitch skipping or needle thread remaining on cloth occurs
at the start of sewing.
1. Remove the air hose connecting to the regulator and cut off the
air.
2. Loosen nut 1.
3. Turn the shaft section of cylinder 2 and adjust so that the
distance from cylinder 2 to thread presser 3 is approximately
5.5 to 6.5 mm (when the cylinder shaft is shrunk).
4. Tighten nut 1.
Confirmation
1. Connect the air hose to the regulator.
2. Pass a piece of tetoron thread #8 through the thread presser
device when air pressure is 0.5MPa, operate the cylinder and
check that the pulling force in the direction A is 2.94N or more.
Results of Improper Adjustment
When the clearance provided
between the threading plate and the
end of machine arm is larger than
the specified value :
™ Threading plate comes in
contact with the thread take-up.
As a result, breakage will result.
When the clearance provided
between the threading plate and the
end of machine arm is smaller than
the specified value :
™ Threading plate comes in
contact with machine arm. As a
result, breakage will result.
When the distance from cylinder to
knuckle is smaller than the specified
value :
™ Needle thread may remain on
cloth at the start of sewing.
When the distance from cylinder to
knuckle is larger than the specified
value :
™ Stitch skipping may occur at the
start of sewing.
When the distance from cylinder to
thread presser is smaller than the
specified value :
™ Bird's nest on the wrong side of
cloth may be lengthened at the
start of sewing.
– 39 –
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