JUKI LH-4128-7 Engineer's Manual page 43

1. Remove the three screws
2. Remove the eight screws
.
3. Adjust the needle bar stroke by adjusting the amount of screw-in of
the needle drive stopper
of screw-in of the needle drive stopper
the nut again. As the needle drive stopper
wards, the amount of stroke begins to decrease. When it is returned
upwards, the amount of stroke begins to increase.
Adjust the needle bar stroke to Size A.
(Caution) When the amount of stroke is adjusted, the needle bar
height is changed at the same time. Therefore, adjust the
as per 5.-(1)-3) Needle bar height.
4. Based on the amount of needle stopper
bar stroke to 0 ± 0.2mm in the position of needle stop. Loosen the nut
and adjust the amount of screw-in of the needle stopper
then, tighten the nut
5. Install the changeover solenoid
firm that the knuckle
cases when the changeover lever
and needle stop side.
6. Loosen the sensor mounting screw
ing screw again after a clearance of 1mm has been secured be-
tween the unilateral needle sensor
7. Fasten the top cover
Adjustment Procedure
, and remove the top cover
, and remove the changeover solenoid
. Loosen the nut
. After adjustments, tighten
screw-in, adjust the needle
again.
by means of eight screws
has a play in the revolving direction in both
stays on the needle drive side
and tighten the sensor mount-
and the solenoid knuckle pin
with three screws
.
and adjust the amount
is screwed in down-
. Since
. Con-
.
– 39 –
Results of Improper Adjustment
o If no play is provided and some
mechanical mismatch is present,
this can be a cause of solenoid
shaft destruction or similar
problem.
.