JUKI LU-2210N-7 Engineer's Manual page 23

Adjustment Procedure
1. Remove the throat plate.
2. Set the stitch dial to [0] on the scale.
3. Loosen the clamping screw
4. Slightly loosen the set screws
saddle.
To loosen the hook shaft base mounting screw
7, loosen the setscrew
der mounting plate
To move the hook shaft base of the LU-2220N-7 to the right or left,
remove three setscrews
take out the thread trimmer air cylinder together with the thread
trimmer air cylinder mounting plate
shaft base mounting screws
base to the right or left.
5. In the state that the needle holder is not effective, adjust the gap to
0 to 0.05mm between the needle and the hook blade point.
6. Turn the eccentric pin
screwdriver to move the hook driving shaft saddle in the opposite
direction of the operator (
7. Fix the hook driving shaft saddle, holding it in the state describing in
step 6, by fastening the set screws
shaft saddle in the written order.
8. Turn the needle holder effectiveness adjusting screw
the effectiveness value to 0.15 to 0.2mm until the gap between the
needle and the hook blade point is adjusted to 0.05 ~ 0.1mm.
9. At this time, confirm that the clearances
hook driving shaft coupling are respectively adjusted to 2.5 ± 0.3
mm.
If not, adjust the clearances properly.
10.Confirm that the needle-to-hook timing is correct. If the timing is
correct, fasten the clamping screw
collar. if not, refer to [(4)-3 Timing between the Needle and the Hook].
When the gap between the needle and the hook blade point has
been adjusted for the LU-2220N-7 and timing for the needle and
the hook has been checked and adjusted, install the removed thread
trimmer air cylinder mounting plate on the hook shaft base.
After the installation, it is necessary to readjust the thread trimmer
system.
of the hook driving shaft set collar.
and of the hook driving shaft
and take out the thread trimmer air cylin-
.
(hexagon socket head cap screws) and
. Since then, loosen the hook
and , and move the hook shaft
of the hook driving shaft saddle with a
) until it will go no further.
and
,
A
of the hook driving shaft set
for the LU-2220N-
in the hook driving
and adjust
, and in the
B C D
– 17 –
Results of Improper Adjustment
o If the clearance between the
needle and the blade point of the
hook is too large:
Stitch skipping or improper thread-
ing may result.
o If the clearance between the
needle and the blade point of the
hook is too small:
The needle may interfere with the
blade point of the hook. As a re-
sult, the blade point of the hook
may be damaged and thread
breakage may be caused.