Brother BAS-311F-0 Instruction Manual page 52

<Replacing the movable and fixed knives>
(2)
1245S
1. Remove screws (1), and remove feed plate (2). Remove screws (3) and (4), and remove needle plate (5). Now
disconnect the thread cutter connecting rod (6) from stud (7).
Movable
knife waster
1247S
2. Remove the movable knife, and replace it with a new
movable knife. Now check the cutting edge of the
movable knife (8) and the fixed knife (9). If necessary,
use the provided movable knife washer to adjust the
knives so that they cut properly.
Adjusting the engagement of the movable knife and fixed knife
A
Cutti
edge
0148Q
A. After the movable knife and fixed knife are properly engaged, tighten the screw as shown in Fig.1.
B. Turn the movable knife (in the direction of the arrow) while the screw is still tightened.
C. Loosen the screw.
D. Turn the movable knife (in the direction of the arrow) while the screw is still loosened.
Repeat above steps A, B, C and D four or five times to maintain the cutting performance of the knife.
(1)
(8)
(9)
B
ng
Cutti
ng edge
BAS-311F-0, 311F-L, 326F-0
(5)
(9)
3. Install the fixed knife (9) 0.5 mm away from needle hole
plate (10).
D
C
9. STANDARD ADJUSTMENTS
(3)
(7)
(6)
0.5 mm
Fig. 1
Movable knife
Fix knife
(4)
1246S
(10)
1248S
0149S
Cutti
ng edge
Cutti
ng edge
0150Q
45