25
AZ8600SD
6.Adjustment of sewing machine
6.6 Adjusting upper and lower knives
6.6.1 Height of lower knife
6.6.2 Height of upper knife (angled type)
Install the edge of the lower knife ① on a level
with the top surface of the stitch plate or 0 - 0.3
mm lower than it.
Loosen the screw ② to adjust it.
Loosen the screw ⑤ and apply the upper knife ③
to the screw ④ fully. It makes the height auto
-
matically.
Then tighten the screw ⑤ securely.
The engagement of the upper knife ③ and the low
-
er knife ① is 0.5 - 1.0 mm at the lowest point
of the upper knife ③ .
Loosen the nut ⑥ and turn the screw ④ to adjust
it.
Fig. 6-10
6.6.3 Sharpness of knives
After adjusting the knives and the width of over-
edge seam, check the sharpness of the edges by
setting the thread between the upper and the
lower knives while rotating the machine pulley by
hand.
③
⑤
④
⑥
①
thread
0.5 -
1.0 mm
Fig. 6-9
0 - 0.3 ㎜
①
②
Fig. 6-11