26
AZ8600SD
6.7 Height of feed dogs
6.Adjustment of sewing machine
6.6.4 Sharpening knives
If the lower knife cuts badly, re-sharpen it. (See
Fig. 6-12)
The upper knife made of super hard alloy is un-
necessary to re-sharpen for about one year and
normal grinder is not useful for re-sharpening
it.
Keep another upper knife for spare.
If needed, contact us directly or the dealer for
re-sharpening it.
1.0 ㎜
③
①
Fig. 6-13
Fig. 6-14
stitch
plate
①
②
③
④
⑤
⑥
Fig. 6-12
10°
55°
To set the standard position, set the tops of the
main and differential feed dogs parallel to that
of the stitch plate when the tops of the feed
dogs are raised and even with that of the stitch
plate.
Install the auxiliary feed dog ⑤ 0.3 ㎜ lower
than the main feed dog ③ .
Adjust the height between the top of the stitch
plate and the rear side of the main feed dog ③
to 1.0 mm when the feed dog is at the highest
point.
Loosen the screws ②④⑥ to adjust the differen
-
tial feed dog ① , the main feed dog ③ , and the
auxiliary feed dog ⑤ respectively.
Make sure there is no step between the main feed dog
③ and the differential feed dog ① . If different height
between them, it can cause the unstable feeding and feed
scratch mark.
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