Needle And Rotary Hook Timing - Brother S-7300A Instruction Manual

12-9. Needle and rotary hook timing

2290M
<-[][]3> 0 - 0.1mm
<-[][]5> 0 - 0.15mm
<Seen from above>
<-[][]3> 0.4 - 0.7mm
<-[][]5> 0.6 - 1.1mm
2293M
2291M
0.5 - 0.7mm
<-[][]3>
1.8mm
<-[][]5>
2.2mm
0948D
0921D
The rotary hook tip (3) should be aligned with the center of
the needle (4) when the needle bar (1) moves up 1.8 mm (for
-[][]3 specifications) or 2.2 mm (for –[][]5 specifications) from
its lowest position to the position where reference line (b) is
aligned with 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 (2) as shown in the
illustration.
2. Loosen the three set screws (5), and then align the rotary
hook tip (3) with the center of the needle (4).
There should be a gap of 0 to 0.1 mm (for -[][]3
specifications) or 0 to 0.15 mm (-[][]5 specifications)
between the rotary hook tip (3) and the needle (4) at this
time.
3. Securely tighten the three 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 to 0.7 mm (for -[][]3
specifications) and 0.6 to 1.1 mm (for -[][]5 specifications).
S-7300A
12. STANDARD ADJUSTMENTS
80