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1)
List of the needle bar
2)
Clearance between the needle and the blade point of the hook
o To adjust the clearance between the needle and the blade point of the
hook and the needle gauge
1. For the sewing machine provided with a thread trimmer, loosen the
setscrew
of the connector link
Loosen the setscrews
2. For the sewing machine of which sewing specification is S, or A, set
the stitch dial at 2.5 on the scale.
For the sewing machine of which sewing specification is G, set the
stitch dial at 3.5 on the scale.
For the sewing machine of which sewing specification is F, set the
stitch dial at 2 on the scale.
3. Raise needle bar
dimension A. At this time, align the lower marker line engaged on needle
bar
with the bottom end face of needle bar rocking base
lift of the needle bar will be 2.2mm.
4. Move the hook shaft base
clearance of 0 to 0.05mm is secured between the needle and the blade
point of the hook and that the needle guard attains the specified effective
amount of 0.03 to 0.1mm. Then, tighten the setscrews
fasten the hook shaft base
5. Install the connector link
At that time, keep the moving knife driving arms
against the moving knife driving arm stopper
the setscrew
.
(Caution) 1. If the hook shaft base setscrew
a lower shaft torque may be generated, thus giving rise
to seizure. (Tightening torque: 2.9N•m)
2. In the case of the sewing machine provided with a thread
trimmer, confirm the initial position of the moving knife
after the completion of adjustments. Refer to 5.- (12) –
1) Moving knife position.
3) Position of the needle and the blade point of the hook
o To change the position of needle and the blade point of the hook
1. Loosen the three setscrews
2. Let the hook blade tip coincide with the center of the needle to secure
Size B and tighten the setscrew
Adjustment Procedure
.
and
of the hook shaft base
from the lowest dead point of its stroke by
to the right or left so that the specified
.
by means of the hinged screw
of the hook shaft screw gear
.
.
, and the
and
to
.
and
pressed
respectively and fix
is tightened too much,
.
– 17 –
Results of Improper Adjustment
o S t i t c h s k i p p i n g o r t h r e a d
breakage will result.
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