Adjusting The Knife Installation Position - Brother LH4-B800E Service Manual

4. Adjustment

4-11. Adjusting the knife installation position

Pulled forward
Adjust so that the upper thread trimmer knife and the cutter do not touch when the cutter is pushed down by hand.
If the upper thread trimmer knife extends below the cutter, pull the stop plate q forward and move the upper thread
trimmer assembly w to the left. (Fig. A → Fig. B)
1. Loosen the screw e, and adjust the cutter Y direction using cutter holder DL r so that the clearance between the
needle bar and the cutter is 0.3 mm. (When replacing the cutter, be careful not to allow the cutter to touch the
needle bar because of any play in the cutter installation position.)
In addition, loosen the screw t and adjust the cutter X direction using cutter holder M y so that the cutter goes
into the center of the cutter groove. Loosen the screw u and move the cutter holder to adjust the direction of
rotation.
When the screw u has been loosened, check that the edge of the cutter holder is touching the stepped section of
*
the cutter driving shaft i, and then tighten the screw u.
After adjusting, push the upper thread trimmer assembly w back to its original position (Fig. A).
*
4 - 10
q
w
Knife groove
Cutter
i
(Fig. A)
u
y
0.3 mm
Y
Touching
LH4-B800E
w
Push
(Fig. B)
r
X
t
e