Brother LK3-B448E - Manual (Page 44)

LK3-B448E MARK II /BA-16
37
10. Adjustments
Adjust the needle bar lift amount as described below so that the tip of the rotary hook is aligned with the center of the
needle when the machine pulley is turned to raise the needle bar from its lowest position until the second reference
line from the top of the needle (reference line B) is aligned with the lower edge of the needle bar bush
q .
1. Open the support
w
in the direction of the arrow, and remove the felt support
e
.
2. Loosen the screw r , and move the driver to adjust so that the tip of the rotary hook is aligned with the needle
center line.
* When returning the felt support
e
, place it as shown in the illustration so as not to clamp the felt
t
, and then
gently press the felt
t
and the wick
y
until they are at the same height as the rotary hook race.
* Return the support w to its original position.
w
e
e
10-1 . Adjusting the needle bar height
Turn the machine pulley to move the needle bar to the lowest position. Then remove the rubber plug
w
, loosen the set
screw e and then move the needle bar up or down to adjust so that the highest reference line (reference line A) is
aligned with the lower edge of the needle bar bush q .
10-2 . Adjusting the needle bar lift amount
t
r
w
e
y
t
t
q
B
A
q