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Adjusting The Needle And Rotary Hook Timing - Brother S-7220D Instruction Manual

Single needle direct drive needle feed lock stitcher with thread trimmer
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Adjusting the needle and rotary
hook timing
When the machine pulley is turned forward to raise the
needle bar (1) 1.8 mm (2.2 mm for -405 specifications)
from its lowest position, the rotary hook tip (3) should
be aligned with the center of the needle (4) as shown in
the illustration when the distance from needle plate
mounting surface A to the bottom edge of the needle
bar (1) is the same as the height of surface C on the
<2> side of the accessory timing gauge (2). At this
time, the gap between the upper edge of the needle
hole and the rotary hook tip (3) will be 0.5 to 1.0 mm
(0.8 to 1.3 mm for -405 specifications).
1
Remove the presser foot (5), needle plate (6) and
feed dog (7).
2
Set the stitch length dial as follows.
Standard stitch length
Specifications
-4[]3
-405
Stitch length dial
0
3
3
Loosen two of the three set screws (9) which are
securing the rotary hook (8).
4
Turn the machine pulley to raise the needle bar
(1) from its lowest position until the distance from
needle plate mounting surface A to the bottom
edge of the needle bar (1) is the same as the
height of surface C on the <2> side of the
accessory timing gauge (2).
5
Loosen the remaining set screw (9) and align the
rotary hook tip (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 to 0.1 mm at this time.
6
Securely tighten the three set screws (9).
7
Install the feed dog (7), needle plate (6) and
presser foot (5).
Adjusting the clearance between the rotary hook
and the hook stopper
8
Check that the thread being used passes
smoothly through the clearance between the
rotary hook (8) and the hook stopper (10).
Standard clearance
Specifications
-4[]3
-405
Clearance
0.4 to 0.7 mm
0.8 to 1.2mm
57

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This manual is also suitable for:

S-7220d-403S-7220d-405S-7220d-433