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17
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Adjustment Procedures
Results of Improper Adjustment
Adjustment Procedures
Results of Improper Adjustment
1) Loosen the screw in the needle bar support base shaft referring to “(7)
Adjusting the position of needle entry (in terms of the needle rocking
direction)”.
2) Remove the thread take-up cover, thread take-up and face plate. Then
loosen screws
2
and
3
in the needle bar connection guide together
with screws
4
and
5
in the needle bar crank rod guide.
3) Loosen screw
1
in the needle bar support base guide shaft and adjust
the needle entry point in terms of longitudinal direction. Then tighten
the screw. (Refer to “(9) Adjusting the needle entry position (in terms of
longitudinal direction”.)
4) Bring the needle bar to the lower dead position. Move the needle bar
support base in the needle rocking direction until a position at which the
base smoothly slide without a play is found. Now, temporarily tighten
screw
3
in the needle bar connection guide.
5) Bring the needle bar to the upper dead position. Move the needle bar
support base in the needle rocking direction until a position at which the
base smoothly slide without a play is found. Now, temporarily tighten
screw
2
in the needle bar connection guide.
6) Sliding the needle bar support base, tighten screws
2
and
3
in the
needle bar connection guide.
7) Tighten screws
4
and
5
in the needle bar crank rod guide the same as
the steps 4), 5) and 6).
* Set the needle throw torque at the needle bar support base to 500g or
less.
8) Tighten the screw in the needle bar support base shaft referring to “(7)
Adjusting the position of needle entry (in terms of the needle rocking
direction”.
9) Attach the thread take-up cover, thread take-up and face plate in position.
(Caution) Be sure to check the longitudinal play at the needle bar
support base. In the case where there is any longitudinal play or
extra load, the needle throing action will be affected.
1) Set the mode to the hook adjusting mode. (See p.18.)
2) Remove the presser foot, throat plate, woodruff plate and feed
dog.
3) Place the woodruff plate on the surface of the machine bed onto
which the throat plate is to be attached. Now, loosen screw
1
and adjust so that the distance from the top face of the woodruff
plate to the bottom end of the needle bar is equal to the height
ofthe “1” side of the timing gauge.
(Caution) Thickness of the throat plate may be different from
that of the woodruff plate. So, be sure to use the woodruff
plate for the adjustment. (Thickness of the woodruff plate :
2 mm)
™
Engraved indication “1” side is the height of the needle bar and
“2” side the needle-to-hook timing.
(Caution) Even when the timing gauge is used, the indented
part of the needle may come in contact with the blade point
of the hook in accordance with the kind or size of the needle.
In this case, slightly lower the needle bar to adjust the height
to the indented part of the needle.
For the LZ-2290 Series, use timing gauge E.
