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S-7200C
10. ADJUSTMENTS
123
１０-１２. 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
from its lowest position to the position where reference line
(b), which is the line at the bottom of the needle bar (1) (third
line from the bottom when using a DA x 1 needle), is aligned
with the lower edge of the needle bar bush D (2) as shown in
the illustration.
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.
(The needle should rise by 1.8 mm [2.2 mm for -[][]5
specifications] and the distance from the needle hole to
the tip of the rotary hook should be 0.5 - 0.7 mm.)
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).
<Checking the clearance between the rotary hook and
bobbin case holder position bracket>
Check that the clearance between the rotary hook (6) and the
bobbin case holder position bracket (7) is enough to allow the
thread being used to pass through smoothly.
The clearance should be 0.4 - 0.7 mm for -[][]S / [][]3 models,
and 0.6 - 1.1 mm for -[][]5 models.
2293M 4258M
2291M 2290M
3869M
0.5 - 0.7mm
1.8mm
<-[][]S / [][]3>
2.2mm
<-[][]5>
<-[][]S / [][]3> 0.4 - 0.7mm
<-[][]5> 0.6 - 1.1mm
<Seen from above>