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1) Timing Adjustment of the Opener
1. Loosen the set screws (2 pcs.)
of the opener shaft screw gear
.
2. For LU-2210N/W-7, LU-2212N-7 and LU-2220N-7: Align the hand-
wheel pointer with the graduation [J] on the hand-wheel.
For LU-2260N/W-7: Align the hand-wheel pointer with the gradua-
tion [K] on the hand-wheel.
3. Turn the opener shaft
using the slot provided on the bottom end of
the opener shaft
.
4. For the standard adjustment turn the opener shaft
so that the
opener is brought to the forward end position in the state described
in item 2 . Then, fasten the set screws (2 pcs.)
of the opener shaft
screw gear.
(Caution)
Re-adjust the thread trimmer cam after the completion
of the adjustment of the opener timing. (Refer to [3.-
(11)-7) and 8) Thread Trimmer Cam and 3.-(12)-11) Ad-
justment of timing for the thread trimming cam]).
2) Clearance between the Opener and the Protruding Section of
the Inner Hook
1. Turn the hand-wheel
to move the opener in the direction of arrow
A. Then, loosen the opener set screw
.
2. Turn the hand-wheel
to move the opener in the direction of arrow
B. Then, loosen the opener set screw
. At that time, be sure to
loosen the screw with the opener positioned at its backward end.
3. Turn the inner hook
in the direction of arrow C, and press the
inner hook stopper
against the inner hook resting section
of
the throat plate.
4. Move the opener and adjust so that a clearance of 0.1 to 0.3 mm is
provided between the opener and the triangular projection
of the
inner hook.
5. Fasten the opener set screw
.
6. Turn the hand-wheel
to move the opener in the direction of arrow
A. Then, fasten the opener set screw
.
Adjustment Procedure
Results of Improper Adjustment
o Loose stitches may be caused.
2’ Refer to [3.-(1) Types and
Names of Graduations on the
Hand-wheel].
4’ Fasten the opener shaft screw
gear set screw
while pressing
the opener from the upper side
and pressing upward the opener
shaft screw gear
so as to
eliminate a play.
• If the opener shaft is turned clock-
wise as viewed from underside,
the timing of the opener is ad-
vanced. If the opener shaft is
turned counterclockwise, it is re-
tarded.
o If the clearance between the
opener and the inner hook trian-
gular projecting section of the in-
ner hook is too large:
• Loose stitches may be caused.
o If the clearance between the
opener and the inner hook trian-
gular projecting section of the in-
ner hook is too small:
• The inner hook
may break.
