Adjusting The Needle Bar Height; Adjusting The Needle And Feed Mechanism Timing - Brother S-7200B Service Manual

Single needle direct drive straight lock stitcher with thread trimmer
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6-8. Adjusting the needle bar height

6-9. Adjusting the needle and feed mechanism timing

<-[][]S / [][]3>
Approx. 1mm
Needle timing is
advanced
<-[][]5>
Approx. 3mm
Needle timing
(Standard)
is retarded
Reference line (a), which is the second line from the bottom
2286M
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).
3698M
The standard position for point of the needle is as described
2288M
below when the feed dog (1) is lowered from its highest
position until it is aligned with the top of the needle plate (2).
(At this time, the "-" mark on the lower shaft will be aligned
with the center of the scale (4) ("O" mark) on the vertical cam
(3).)
<-[][]S / [][]3>
The top of the feed dog (1) and the top of the needle plate
(2) should be aligned, and the point of the needle should
be approximately 1 mm below the needle plate (2).
<-[][]5>
The top of the feed dog (1) and the top of the needle plate
(2) should be aligned, and there should be a clearance of
approximately 3 mm between the point of the needle and
the needle plate (2).
1. Tilt back the machine head.
2. Loosen the two set screws (5), and then turn the vertical
cam (3) sligtly to adjust the timing. (Use the "-" mark on
the lower shaft and the alignment position on the scale (4)
of the vertical cam (3) as a guide.)
・ To set to the standard position, align the "-" mark on
the lower shaft with the center of the scale (4) ("O"
mark) on the vertical cam (3). ([A] in the illustration)
・ To prevent material slippage from occurring, retard the
needle timing. (Turn the vertical cam (3) in the
direction of (B). Refer to [B] in the illustration.)
・ To improve thread tightening, advance the needle
timing. (Turn the vertical cam (3) in the direction of (C).
Refer to [C] in the illustration.)
NOTE: Do not turn the vertical cam (3) too far in the
direction of (C), otherwise it could cause the
needle to break.
3. After adjustment is completed, securely tighten the two
3699M
screws (5).
S-7200B
6. ADJUSTMENTS
30

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