MODEL 3128
18
MECHANICAL ADJUSTMENT
ADJUSTING SCREW
A
LEFT SIDE LINE
TACK WIDTH
RIGHT SIDE LINE
TACK WIDTH
ADJUSTMENT OF RIGHT HAND LINE TACK WIDTH AND CAM
FOLLOWER RELEASE AMOUNT
* The width of the left and right side line tack of buttonhole should be equal. If there is large
difference between left and right line tack width, the cam follower may be hindered with the
zigzag cam block when you turn the pattern selector dial.
1. Sew a buttonhole and check the difference in both line tack widths.
2. Remove the front cover (see page 6).
3. Adjust the line tack width by turning the adjusting screw.
* The right side of the line tack is fixed so the adjustment should be done on the left side line
tack.
If the left side line tack is wider than the right side:
Turn the adjusting screw in the direction of
"
A
"
If the right side line tack is narrower than the left side:
Turn the adjusting screw in the direction of
"
B
".
B
