Brother S-7300A-333P Instruction Manual page 96

12. STANDARD ADJUSTMENTS
Lowest position of
needle bar
Reference
line (a)
Direction of cam
rotation
85
<Thread trimming cam position adjustment>
1. Turn the machine pulley to raise the needle bar 6 mm
Raised 6 mm
Reference
line (b)
0958D
2. At the above position, push the plunger (1) of the thread
3. Check that the clearance between the edge of the thread
* Tighten the two set screws (5) to approximately 4 N.m.
0959D
S-7300A
from its lowest position (reference line (a) position) so
that reference line (b) is aligned with the bottom edge of
the needle bar bush.
trimming solenoid with your finger in the direction of the
arrow.
Adjust the position of the thread trimmer cam (2) at this
time so that the roller shaft (4) of the thread trimming cam
lever assembly (3) touches the hollow (c) of the thread
trimmer cam (2) and so that the clearance between the
edge of the thread trimmer is 0.6 to 0.8 mm. (Fig. A)
trimmer cam (2) and the roller shaft (4) is 0.5 mm when
the roller shaft (4) returns to the right. (Fig. (B))