– 9 –
Adjustment Procedure
Results of Improper Adjustment
1. Set the dial to adjust the amount of alternating the vertical movement
of the walking foot and presser foot to [1] on the scale.
2. Remove the top cover.
3. Set the stitch dial to maximum value on the scale.
4. Loosen the set screw of the reverse feed cylinder. (Except for LU-
2212N-7 and LU-2220N-7)
5. Remove the reverse feed cylinder. (Except for LU-2212N-7 and LU-
2220N-7)
6. Remove the aperture plate.
7. Loosen the set screw
of the needle bar connecting rod.
8. Loosen the set screws
of the thrust collars of the needle bar
frame driving shaft.
9. Remove the presser spring regulating dial
.
10. Loosen the set screw
of the presser spring regulating arm shaft.
11. Remove the presser adjusting spring
.
12. Remove the presser adjusting arm
.
13. Remove the presser spring regulating arm shaft
.
14. Loosen the set screw
of the thread take-up crankshaft.
15. Loosen the set screw
of the thread take-up crankshaft support.
16. Draw out the thread take-up crankshaft
.
17. Remove the triangular lever shafts
and
.
18. Adjust the needle entry.
19. Fasten the set screws
of the thrust collar.
20. Adjust the position of the thread take-up crankshaft support
in
accordance with the position of the thread take-up crank
.
21. Fasten the set screw
of the thread take-up crankshaft support.
22. Insert the thread take-up crankshaft
into the thread take-up crank
until the shaft reaches the end face of the thread take-up crank.
23. Fasten the set screw
of the thread take-up crankshaft.
(Caution) Tightening torque shall be 2.45 to 2.94N•m (25 to
30kgf•cm).
24. Attach the triangular lever shafts
and
in place.
25. Attach the presser spring regulating arm
in place.
26. Attach the presser spring regulating arm shaft
in place.
27. Fasten the set screw
of the presser spring regulating arm shaft.
28. Attach the presser adjusting spring
.
29. Attach the presser spring regulating dial
in place.
30. Set the stitch dial to [0] on the scale.
31. Adjust the needle entry in the needle slot of the feed dog
in the
feeding direction.
32 . Fasten the clamping screw
of the needle bar connecting rod.
(Caution)
Fasten the screw with a tightening torque of 7.84 to
8.82N•m (80 to 90 kgf•cm).
33. Attach the aperture plate in place.
34. Attach the reverse feed cylinder in place, and fasten the set screw
in it. (Except for LU-2212N-7 and LU-2220N-7)
6’
For how to remove or attach the
aperture plate in LU-2212-N-7
and LU-2220N-7, refer to [3-
(17) and (18) Aperture Plate
Removal Procedure].
17’ Tilt the triangular lever
,
which has been set free, toward
the presser bar lifting lever. At
this time, eliminate a thrust play
at the needle bar frame
and
fasten the set screw while os-
cillating the needle bar frame
toward the operator.
20’ At that time, move the thread
take-up crank shaft support
and adjust so that the end face
of the thread take-up crankshaft
support
come in slight con-
tact with the end face of the
thread take-up crank, but pro-
viding no play between them.
21’ Fasten the set screw while
making the contact point of the
thread take-up crankshaft sup-
port
with the screw straight
up.
31’ Refer to [3.-(3)-2) Needle entry
in the needle slot of the feed
dog in the lateral direction].
32’ At that time, fluctuate the
needle bar connecting rod
to the right or left until the
needle bar connecting rod
is approximately placed at the
center of the play, and fasten
the clamping screw.
