Quick Reverse Mechanism; Matching Stitch Lengths For Normal Feed And Reverse Feed - Brother S-7200A Service Manual

5. ADJUSTMENTS

5-10. Quick reverse mechanism

5-11. Matching stitch lengths for normal feed and reverse feed

Normal feed
11 stitches
Normal feed length
becomes smaller
29
2295M
2296M
1822M
Reverse feed
Normal feed length
becomes longer
2297M
S-7200A
1. Turn the stitch length dial to the maximum setting.
2. Tilt back the machine head.
3. Loosen the two screws (1).
4. With the reverse lever (2) fully lowered, move the solenoid
base (5) so that there is no gap between the quick reverse
solenoid (3) and the rubber stopper (4), and then tighten
the screws (1).
* If the gap mentioned above is large, the operation of the
quick reverse solenoid (3) will become sluggish.
The following operation matches the stitch lengths for normal
feed and reverse feed.
1. Turn the stitch length dial to the "3" setting.
2. At a low sewing speed (220 rpm), sew using normal feed
and using reverse feed (11 stitches in each direction).
3. If adjustment is required, carry out the following.
1) Tilt back the machine head.
2) Loosen the screw (1).
3) Adjust by turning the eccentric pin (2) within a range of
90°. (If the eccentric pin (2) is turned more than 90°,
the adjustment will be reversed.)
・ If the stitch length is larger for normal feed than
for reverse feed
Turn the eccentric pin (2) clockwise.
・ If the stitch length is smaller for normal feed
than for reverse feed
Turn the eccentric pin (2) counterclockwise.
4. After making the adjustment, set the eccentric pin (2)
gently against the solenoid lever (3) and securely tighten
the screw (1).
NOTE:
After tightening the eccentric pin (2), operate the quick
reverse lever and check that the solenoid lever (3)
operates smoothly.
If the solenoid lever (3) does not operate smoothly,
retighten the eccentric pin (2) while referring to step 4
above.