14
Gap (a): Feed dog ascending to the level of the needle plate
Gap (b): Feed dog descending to the level of the needle plate
Presser foot (unit)
Needle plate
Main feed dog
Set the stitch length dial set to “3” and the differential feed dial to “1.0”.
The gap (a) is the gap between the main feed dog and the sub feed dog when ascending to the level of the needle
plate.
The gap (b) is the gap between the main feed dog and the sub feed dog when descending to the level of the needle
plate.
The difference of the gap (a) and the gap (b) should be 0.1 mm or less.
To adjust:
NOTE:
Adjust the differential feed, after adjusting the feed dog
height (Refer to page 13).
1. Set the stitch length dial to “3” and the differential feed
dial to “1.0”.
2. Open the looper cover and remove the belt cover.
3. Remove the presser foot (unit).
4. Turn the handwheel toward you to raise the main feed
dog and the sub feed dog until the upper surface
of the feed dog aligns with the upper surface of the
needle plate.
5. Measure the gap (a) between the main feed dog and
the sub feed dog.
6. Turn the handwheel toward you to lower the main
feed dog and the sub feed dog until the upper surface
of the feed dog aligns with the upper surface of the
needle plate.
7. Measure the gap (b) between the main feed dog and
the sub feed dog.
8. If the difference between gaps (a) and (b) is larger
than 0.1 mm, loosen the setscrew and adjust the
differential feed as follows.
⇨
If the gap (a) is larger than the gap (b), turn the
stitch length adjusting pin to the direction where
the differential feed adjusting rod ascends.
⇨
If the gap (b) is larger than the gap (a), turn the
stitch length adjusting pin to the direction where
the differential feed adjusting rod descends.
9. Repeating the steps 4-7, adjust the differential feed
until the difference between gaps (a) and (b) becomes
0.1 mm or less.
10. After adjustment, tighten the setscrew.
11. Attach the presser foot (unit).
12. Attach the belt cover and close the looper cover.
Stitch length
adjusting pin
Differential feed
adjusting rod
Setscrew
Sub feed dog
To adjust the differential feed
Mechanical Adjustment
MODEL: AirThread 2000D
