S-7000DD
7. STANDARD ADJUSTMENTS
32
7-7. Adjusting the needle and rotary hook timing
The tip of the rotary hook (3) should be aligned with the
center of the needle (4) when the needle bar (1) moves up
1.8 mm (2.2 mm for –[]03A and –[]05 specifications) from its
lowest position to the position where reference line (b) is
aligned with the lower edge of the needle bar bush (2) as
shown in the illustration. (The distance from the upper edge
of the needle hole to the rotary hook tip will be 0.5 to 0.7 mm
at this time.)
1. Turn the machine pulley to raise the needle bar (1) from
its lowest position until reference line (b) is aligned with
the lower edge of the needle bar bush D (2) as shown in
the illustration.
2. Loosen the set screws (5), and then align the tip of the
rotary hook (3) with the center of the needle (4).
The distance between the tip of the rotary hook (3) and
the needle (4) should be approximately 0 - 0.05 mm.
3. Securely tighten the set screws (5).
2291M
2290M
<-[]03>
1.8 mm
<-[]05>
2.2 mm
3869M
0.5 - 0.7 mm
