Adjusting The Needle Bar Height; Adjusting The Needle And Feed Mechanism Timing - Brother S-7100A-403 Instruction Manual

7. STANDARD ADJUSTMENTS

7-5. Adjusting the needle bar height

7-6. Adjusting the needle and feed mechanism timing

<-[]03>
Approx. 1 mm
<-[]03A>
Flush with top
of needle
plate
Needle timing is
advanced
31
<-[]05>
Approx. 3 mm
Needle timing
(Standard)
is retarded
Reference line (a), which is the second line from the bottom
of the needle bar (1) (fourth line from the bottom when using
a DA x 1 needle) should be aligned with the lower edge of
the needle bar bush D (2) as shown in the illustration when
the needle bar (1) is at its lowest position.
1. Turn the machine pulley to set the needle bar (1) to its
lowest position.
2. Remove the oil cap (3).
3. Loosen the screw (4) and then move the needle bar (1) up
or down to adjust its position.
4. Securely tighten the screw (4).
5. Replace the oil cap (3).
0535D
The illustration at left shows the standard position for the
needle tip when the feed dog (1) is lowered from its highest
position until it is flush with the top of the needle plate (2).
1. Remove the rubber cap (3).
2. Loosen the two set screws (5) of the vertical cam (4), and
then turn the vertical cam (4) slightly to adjust the timing.
・ To advance the needle timing, turn in the direction of
<A>. 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 vertical cam (4) is turned too far in the direction
of <A>, it may cause the needle to break.
3. After adjusting, securely tighten the set screw (5).
4. Replace the rubber cap (3).
0536D
S-7100A