To Adjust The Positions Of The Upper Knife And The Lower Knife - Janome AirThread 2000D Service Manual

To adjust the position of the upper knife and the lower knife
When the upper knife is at the lowest position, the front lower corner of the upper knife should be 1.0 to 2.0 mm below
the edge of the lower knife.
The distance between the left surface of the lower knife and the front lower corner of the upper knife should be 0.6 to 1.0
mm.
Edge of the lower knife
1.0 to 2.0 mm
Edge of the
Edge of the
lower knife
lower knife
Front lower
corner of the
upper knife
Bolt
Mechanical Adjustment
Surface of the
needle plate
1.5 mm
Gauge
Upper knife
0.6 to 1.0 mm
To check:
1. Open the looper cover (unit).
2. Set the upper knife to the lowest position by turning
the handwheel toward you.
3. Check if the front lower corner of the upper knife is 1.0
to 2.0 mm below the edge of the lower knife.
4. Check if the distance between the left surface of the
lower knife and the point of the upper knife is 0.6 to 1.0
mm.
If not, adjust as follows.
To adjust:
1. Open the looper cover (unit).
NOTE:
When replacing the upper knife:
(1) Set the upper knife to the highest position and remove
it.
(2) Attach the new upper knife and partially tighten the
bolt.
2. Set the upper knife to the lowest position by turning
the handwheel toward you.
3. Loosen the bolt.
Adjust the position of the upper knife so that the front
lower corner of the upper knife should be 1.0 to 2.0
mm below the edge of the lower knife.
4. While maintaining the height of the upper knife
unchanged, adjust the position of the upper knife and
the lower knife so that the distance between the left
surface of the lower knife and the point of the upper
knife is 0.6 to 1.0 mm.
NOTE:
Do not move the upper knife vertically.
After adjustment, tighten the bolt.
While tightening the bolt, the upper knife may turn
clockwise. After tightening the bolt, re-check if the
distance is 0.6 to 1.0 mm.
Push the upper knife support plate (unit) to the right to
check if the upper knife supporter moves smoothly.
5. Check if the front lower corner of the upper knife is 1.0
to 2.0 mm below the edge of the lower knife.
Check if the distance between the left surface of the
lower knife and the point of the upper knife is 0.6 to 1.0
mm.
6. Close the looper cover.
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MODEL: AirThread 2000D