– 106 –
1) If the knife sharpness has deteriorated, re-sharpen
counter knife
1
soon as illustrated in Fig.
C
. Then
re-attach it in position.
2) If the mounting position of the counter knife is
moved in the right (direction
A
) from the standard
mounting position, length of the thread remaining
after thread trimming will be longer than the stan-
dard length by the distance between the standard
position.
3) If the mounting position of the knife is moved in the
left (direction
B
), length of the thread remaining af-
ter thread trimming will be shorter than the standard
length accordingly.
4
Needle
Hook
Hook blade
point
Center
0.04 to 0.1 mm
Needle
Hook
Hook blade
point
3) Adjust so that the lower end of the needle bar is aligned with the top surface of hook timing gauge
4
on 2
side, a clearance of 0.04 to 0.1 mm is provided between the needle and the blade point of the inner hook and
the blade point of the hook meets the center of the needle. Then, tighten three screws that are used to secure
the hook.
4) Attach knife mounting base
C
to the bed surface.
At this time, pressing the knife mounting base in the direction of the arrow to provide a 0.5 mm clearance be-
tween the base and the bed surface. Then, tighten screws
2
and
3
. Finally, tighten screw
1
.
1-3. Counter knife
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
A
B
C
1
1
