– 31 –
Adjustment Procedures
Results of Improper Adjustment
™
Moving knife
1. Loosen setscrew
1
.
2. In the state that moving knife drive arm
2
comes in close
contact with drive arm stopper
3
, move moving knife
4
so
that the distance from the top end of moving knife
4
to the
end of the machine bed is 26.4
±
0.2 mm.
3. Tighten setscrew
1
.
Confirmation
1. Set the stitch dial to “0”.
2. Remove the air hose connecting to the regulator and cut off
the air.
3. Raising upward knife fixing plate
8
, advance moving knife
4
and waiting knife
9
by hand.
4. Turn the handwheel in the state that cam roller
!1
is located in
the groove of thread trimmer cam
!0
and adjust the needle bar
to the upper dead point of its stroke.
5. Advance moving knife
4
and check that moving knife
4
lightly
moves.
6. Return moving knife
4
and waiting knife
9
to the respective
initial positions and connect the air hose to the regulator.
™
Waiting knife
1. Loosen setscrew
5
.
2. Press waiting knife base
7
in the direction of arrow A in the
state that there is a clearance of 0.1 to 0.2 mm between waiting
knife drive arm B
6
and drive arm stopper
3
and make the
long hole in waiting knife base
7
come in close contact with
the knife shaft. (At this time, moving knife
4
should stay at the
initial position.)
3. Tighten setscrew
5
.
Confirmation
1. Set the stitch dial to “0”.
2. Remove the air hose connecting to the regulator and cut off
the air.
3. Raising upward knife fixing plate
8
, advance moving knife
4
and waiting knife
9
by hand.
4. Check that cam roller
!1
lightly enters the groove of thread
trimmer cam
!0
.
Standard : Lower end plane of waiting knife drive arm B
6
aligns with that of the waiting knife shaft.
5. Return moving knife
4
and waiting knife
9
to the respective
initial positions and connect the air hose to the regulator.
6. Move waiting knife
9
to and fro and check that there is a play
of 0.1 to 0.25 mm.
When the diatance from the top end
of moving knife to the end of
machine bed is larger than the
specified value :
™
Defective clamp will result.
™
Moving knife interferes with the
machine bed to cause the knife
to break.
When the distance from the top end
of moving knife to the end of
machine bed is smaller than the
specified value :
™
Moving knife interferes with the
feed dog to cause the knife to
break.
™
Detective thread trimming will
result.
When the clearance between the
waiting knife drive arm B and the
drive arm stopper is larger than the
specified value :
™
Waiting knife interferes with the
feed dog to cause the knife to
break.
When the clearance between the
waiting knife drive arm B and the
drive arm stopper is smaller than
the specified value :
™
Breakage of the waiting knife
base or the knife shaft will result.
™
When the cam roller does not
move smoothly, the cam and the
roller interfere with each other.
A s a r e s u l t , b r e a k a g e o r
machine lock will result.
™
If there is no play, breakage of
the waiting knife base or the
knife shaft will result.
