Adjusting The Needle And Rotary Hook Timing - Brother S-7200B Service Manual

Single needle direct drive straight lock stitcher with thread trimmer
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6. ADJUSTMENTS

6-10. Adjusting the needle and rotary hook timing

2290M
<-[][]S / [][]3>
0.05mm
<Seen from above>
<-[][]S / [][]3> 0.4 - 0.7mm
<-[][]5> 0.6 - 1.1mm
2293M
31
0.5 - 0.7mm
1.8mm
<-[][]5>
2.2mm
0 - 0.05mm
The tip of the rotary hook (3) should be aligned with the
2291M
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.
(At this time, the gap between the upper edge of the needle
hole and the rotary hook tip (3) will be 0.5 - 0.7 mm.)
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 three 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 three set screws (5).
2292M
<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.
3700M
S-7200B

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