Adjusting The Needle And Feed Mechanism Timing - Brother S-7300A-333P Instruction Manual

12. STANDARD ADJUSTMENTS

12-8. Adjusting the needle and feed mechanism timing

(1)
(6)
<-[][]3>
Needle timing is
advanced
79
<-[][]5>
0mm
(Standard)
Needle timing is
retarded
1. Turn on the power.
2. Start backtack sewing, best PFM mode, slow start, special
locus and X-over seam assist will turn off.
3. Set the feed pitch to 3 mm (for -[][]3 specifications) or to 4
mm (for -[][]5 specifications). (Refer to "5-4-3. Main sewing
settings ".)
4. Press the menu key (1).
* The standard position for the point of the needle is as
described below when the feed dog (2) is lowered from its
highest position until it is aligned with the top of the
needle plate (3).
<-[][]3>
1 - 4mm
<-[][]5>
0919D
5. Tilt back the machine head.
6. Loosen the two set screws (5) of the feed lifting eccentric
cam (4), and then turn the feed lifting eccentric cam (4)
slightly to adjust the timing.
・ To advance the needle timing, turn in the direction of
<A>, and to retard the needle timing, turn in the
direction of <B>.
・ To prevent material slippage from occurring, retard the
needle timing. (Fig. (B))
・ To improve thread tightening, advance the needle
timing. (Fig. (A))
NOTE: If the feed lifting eccentric cam (4) is turned too
far in the direction of <A>, it may cause the
needle to break.
7. After adjusting, securely tighten the set screw (5).
8. Press the home key (6).
0920D
S-7300A
This is the position where the top of the feed
dog (2) and the top of the needle plate (3)
are aligned, and the point of the needle is
aligned with the bottom edge of the needle
plate (3).
The top of the feed dog (2) and the top of the
needle plate (3) are aligned, and there is a
clearance of 1 to 4 mm between the point of
the needle and the top of the needle plate
(3).