JUKI SC-905 - Page 16

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Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
Adjustment Procedures Results of Improper Adjustment
B
A
A = B
1) Loosen setscrews 2 and remove bobbin winder unit 1.
2) Set both zigzag width and stitch base line to the position of “0”.
Set the position of the needle to the center and teporarily tighten it.
3) Set the zigzag width to 8 mm which is factory-adjusted at the time of
delivery, and securely tighten screw 3 at the position where the
clearances of zigzag widths A and B are equal.
Conditions : Needle enters the center of zigzag width.
: Max. zigzag width (8 mm)
(Caution) Do not flap or strongly press the needle bar at the time of
adjustment.
1) Loosen the screw, which can be observed through the hole for
adjustment, in the needle bar support base guide shaft with the face
plate attached.
2) Move the needle bar back or forth to adjust so that the needle enters
the center of the needle slot in the throat plate.
3) Fix the needle bar support base guide shaft.
4) Be sure to check the needle throw torque applied to the needle bar
support base.
(Caution)
1. The needle entry position in terms of the longitudinal direction
should be finely adjusted. If the needle bar has to be moved by
a large margin for the adjustment of the needle entry position in
case of replacement of gauges, carry out the adjustment
referring to “(10) Position of the needle bar connection guide”.
2. Be sure to check the left/right plays at the needle bar support
base.
In the case where there is any extra load applied to the base,
needle throwing action will be affected.
1) Loosen screw 1 in the face plate.
2) Remove rubber cap 2. Then tighten screw 1 while pressing pin 3 in
the needle bar support base guide located inside the face plate with a
screwdriver.
3) At this time, move the needle bar to the right and left by hand to confirm
that there is neither extra load nor a longitudinal play.
4) If the load applied to the needle bar and the longitudinal play existing at
the needle bar at the rightmost needle throw position differ from those
at the leftmost needle throw position, perform the adjustment by turning
pin 3 in the needle bar support base guide to change the orientation of
the engraved marker dot (toward the direction where the load and play
are larger).
(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 throwing action will be affected.
™ Thread will not be uniformly tensed
when the needle throws to the right
and left, or thread breakage or
needle breakage will result.