7-4
7-3) PICKER ADJUSTMENT
If the position or the starting height of the picker is incorrect, the machine may not be able to separate the upper and
the lower thread and cut them both, resulting in short upper thread.
①
Adjusting the picker position
Manually move the picker so it touches the
bobbin. Using the picker screws, adjust so the tip
of the picker is in the correct position as in
[Fig.7-7].
②
Adjusting the starting height
Unfasten the screw on the picker stopper. Adjust
eccentricity so that the picker softly touches the
bobbin when pressed by hand.
Correct
position
of picker
Picker
Picker
Picker stopper
Bobbin
case
Picker
screw
Picker stopper
[Fig.7-7]
[Fig.7-8]
7-4) ADJUSTING UPPER THREAD HOLDER
①
Adjusting Sensor Adjustment Rings
Make the following adjustments if you find errors in the wiper return system.
ⓐ
Open the cover of the wiper motor. Of the two sensor adjustment rings, align the center of the sensor screw in
the rear ring with the #1 carve point on the fixed block on the cam shaft. Align the center of the sensor screw
in the front ring with the #2 carve point on the fixed block on the shaft.
ⓑ
Adjust so the wiper return sensor is 1-1.2mm from the upper head of the sensor screw. Make sure to check if
the wiper return sensor turns on.
[Fig.7-9]
Wiper return sensor
Sensor screw (rear)
Sensor screw (front)
#2 carve point
Fixed block on the cam shaft
Sensor adjustment ring
#1 carve point