To Replace The Lower Looper - Janome AirThread 2000D Service Manual

To replace the lower looper

Upper knife
Bolt
Needle plate
Setscrew A
Looper cover guide
Setscrew B
Upper knife
Upper knife release knob
Chaining finger
Chaining finger switch knob
Lower looper
connecting pipe arm
Setscrew D
Mechanical Adjustment
Lower looper
Setscrew C
Lower looper base
Lower looper (unit)
Mouth of the
lower looper
pipe
Tube
Lower looper
connecting pipe arm
Lower looper
connecting pipe (unit)
To remove:
1. Open the looper cover (unit) and the side cover (unit).
2. Set the chaining finger switch knob to "R" and lower
the chaining finger.
3. While pressing the upper knife release knob, turn it
clockwise by half a rotation to deactivate the upper
knife.
4. Remove the left needle and the right needle.
5. Remove the presser foot (unit).
6. Remove the setscrew A and remove the needle plate.
7. Remove the setscrews B (2 pcs.) and remove the
looper cover guide.
8. Remove the bolt and remove the upper knife.
9. Set the lower looper to the rightmost position by
turning the handwheel toward you.
10. Remove the setscrew C and the setscrews D (2 pcs.).
Remove the lower looper connecting pipe arm with the
lower looper (unit) and the lower looper connecting
pipe (unit) connected.
NOTE:
Make sure that the looper does not hit the chaining finger.
Remove the lower looper pipe from the mouth of the
lower looper (unit).
11. Remove the tube from the lower looper (unit).
To attach:
1. Insert the mouth of the lower looper (unit) into the
tube and pull the tube upward until the upper end of
the tube aligns with the mouth of the lower looper (unit).
2. Turn the handwheel counterclockwise to move the
lower looper base to the rightmost position.
3. Insert the lower looper connecting pipe into the tube
on the mouth of the lower looper pipe and push the
edge of the lower looper connecting pipe into the
mouth of the lower looper pipe to engage them.
NOTE:
Make sure that the tube is not clipped between the
edge of the looper and the edge of the lower looper
connecting pipe.
4. Partially tighten the setscrews D (2 pcs.) to fix the
lower looper connecting pipe arm.
Aligning the the screw hole of the lower looper with
the screw hole of the lower looper base, artially
tighten the setscrew C to fix the lower looper.
5. Place the U groove of the lower looper height gauge
on the lower looper crank shaft.
Loosen the setscrew C and adjust the height of the
lower looper (unit).
Tighten the setscrew C. (Refer to pages 17 and 18.)
6. Attach the left needle and the right needle.
7. Check the clearance between the needle and the
lower looper, the timing of the needle and the lower
looper, the clearance between the upper looper and
the lower looper, and the timing of the upper looper
and the lower looper (Refer to pages 21, 23, 25 and
27.)
8. Loosen the setscrews D (2 pcs.). Adjust the position
of the mouth of the looper connecting pipe (unit) and
the slide pipe (refer to page 34). Check if the looper
can be threaded the the looper thrader (air) and
tighten the setscrews D (2 pcs.).
9. Tighten the bolt to fix the upper looper. (Refer to page
20).
10. Tighten the setscrews B (2 pcs.) to fix the looper
cover guide.
11. Tighten the setscrew A to fix the needle plate.
12. Attach the presser foot (unit).
13. While pressing the upper knife release knob, turn it
clockwise to activate the upper knife.
14. Close the looper cover and the side cover.
18
MODEL: AirThread 2000D