– 47 –
Height of the Moving Knife (for the left-hand side hook)
1. Tilt the machine head.
2. Loosen the set screws (two pcs.)
of the moving knife shaft thrust
collar
and the clamping screw
of the moving knife driving arm
C
.
3. Loosen the clamping screw
of the moving knife driving arm A
.
4. Adjust so that a clearance of 0.4 to 0.5 mm is provided between the
moving knife
and the inner hook
, by moving the moving knife
shaft
up and down.
5. Fasten the set screws (2 pcs.)
of the moving knife shaft thrust
collar
.
6. Fasten the clamping screw
of the moving knife driving arm C
and the clamping screw
of the moving knife driving arm A
.
(Refer to [3.-(10)-4) Moving Knife Driving Arms A, B and C]).
o If the clearance between the
moving knife and the bobbin case
is too large:
• The needle thread and the bob-
bin thread may fail to be caught
by the knife.
o If the clearance between the mov-
ing knife and the bobbin case is
too small:
• The moving knife
may inter-
fere with the bobbin.
Adjustment Procedure
Results of Improper Adjustment
