19
14) Adjusting clearance between hook
and opener
KM-390BL
Loosen the fastening screw
and adjust the opener from
side to side so that the clearance between the hook
and the
opener
to be 0.2mm when the opener is pulled to its
maximum to the direction of arrow as shown in Figure 28.
When the adjustment is finished, fasten tightly the fastening
screw
.
[Figure 28]
15) Assembling feed cam
KM-380BL
The standard is when the No. 1 fixing screw
of the feed cam
“A”, the center of No. 1 fixing screw
of the feed cam “B”,
and the center
of the crank rod lubricating hole are being
coincided in one straight line like in Figure 29 after fixing the
needle to its lowest point.
In this state, turn the pulley to raise needle and make the end of
hook and needle cross. After that, feed dog and needle do not
move when moves reverse lever up and down.
[Figure 29]
KM-390BL
The standard is when the No. 2 fixing screw
of the feed cam
and the upper shaft marked line
are coincided as in Figure 30
after placing the thread take up to its highest point.
[Figure 30]
so only the pulley of safety assembly rotates idly.
In case that the safety assembly starts operating during the
work, turn power switch off and remove causing factors of load.
Later, with safety button
pressed, turn the pulley to place the
driving ball
of safety assembly to its original position.
Adjust the intensity of the safety assembly spring by
rotating three safety assembly adjustment screws
from
side to side in accordance with working conditions.
(Turning the screw to left makes the intensity stronger, and
right to make it weaker. Make sure to give same pressure
on the three screws.)
16) Adjusting safety assembly
KM-390BL
If the load occurs by foreign substances on thread, needle, etc. during the sewing operation, the driving ball
of safety assembly in
Figure 30 is removed to prevent damage of the hook and other major parts from the load, and the pulley
and the clutch plate
on the safety assembly are removed. Then, the driving force of timing belt on the upper shaft does not delivered to the lower shaft,
[Figure 31]
Feed cam “A” Feed cam “B”
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