To Adjust The Timing Of The Upper Looper And The Lower Looper - Janome AirThread 2000D Service Manual

To adjust the timing of the upper looper and the lower looper

When the lower looper moves to the right from the leftmost position and the tip of the upper looper meets the lower
edge of the lower looper as shown in the Fig. 1, the standard distance (front view) between the tip of upper looper and
the tip of the lower looper is 3.5 to 4.1 mm.
3.8 mm
Fig. 1
Upper looper tip
Fig. 2
Fig. 3
Mechanical Adjustment
Gauge
Lower looper tip
3.5 to 4.1 mm
Upper looper cam
Setscrew
(A)
(B)
Setscrew
To adjust:
NOTE:
Adjust adjusting the timing of the needle and the lower
looper, the position of the tip of the upper looper and the
leftmost position of the upper looper, and the timing of
the upper looper and the lower looper (Refer to pages 24,
25 and 27).
1. Open the side cover and remove the base plate.
2. While pressing the upper knife release knob, turn it
clockwise by half a rotation to deactivate the upper
knife.
3. Turn the handwheel toward you to set the upper
looper and the lower looper to the phase shown in
the Fig. 1 (when the lower looper moves from left to
right and the upper looper moves upward). Turn the
spreader to the right.
4. Place the plate gauge on the lower looper and check
the position of the tip of the upper looper.
5. If the position of the tip of the upper looper is not
correct, loosen the setscrews (2 pcs.) and adjust the
position by turning the upper looper cam.
⇨ If the timing of the upper looper is early (as shown
in Fig. 2), turn the upper looper cam in the direction
(A) and tighten the setscrews (2 pcs.).
⇨ If the timing of the upper looper is late (as shown in
Fig. 3), turn the upper looper cam in the direction (B)
and tighten the setscrews (2 pcs.).
6. After adjustment, check the clearance between
the needle and the upper looper and the clearance
between the upper looper and the lower looper (Refer
to pages 26 and 29.)
7. Attach the base plate and close the side cover
8. While pressing the upper knife release knob, turn it
clockwise by half a rotation to activate the upper knife.
27
MODEL: AirThread 2000D