– 16 –
1. When raising the intermediate presser height, turn the pulley by hand to lower the needle
bar, and confirm that the needle bar does not interfere with the intermediate presser.
2. Take care not to get your hands and fingers caught in the feeding frame or intermediate
presser.
4-9. Intermediate presser height
Press INTERMEDIATE PRESSER SETTING button
A
and adjust
with TEN keys
B
so that the clearance between the bottom end of
intermediate presser and the cloth is 0.5 mm (thickness of thread
used).
A
B
4-8. Procedure for adjusting the thread breakage detection sensor
The thread breakage detection sensor is a sensor
for detecting that the thread feeding (movement)
is stopped by thread breakage.
The sensitivity of the sensor has been factory-ad-
justed to the standard adjustment value at the
time of shipment. In the following cases, however,
the sensor should be re-adjusted.
◦
The sewing machine stops even when the
thread does not break.
(In the case of using thin thread, the thread
tension is too high, the sewing machine runs at
a low speed, etc.)
⇒
Turn the adjusting knob
❶
clockwise to in-
crease the sensitivity.
◦
The sewing machine does not stop even when
the thread breaks.
(In the case of the sewing machine runs at a
high speed, etc.)
⇒
Turn the adjusting knob
❶
counterclockwise to
decrease the sensitivity.
* The sensor sensitivity should be adjusted to
3 to 4.5, as a guide, according to the thread
tension and the type of thread.
※
The figure shows the adjustment value 3.5.
❶
❷
ON
OFF
1. The thread breakage detection sensor is provided with ON-OFF switch
❷
. The sensor
does not work unless the switch is placed in ON.
2. The standard adjustment value of adjusting knob
❶
is 3.5.
3. One scale mark corresponds to the angle of approximately 45º. After the adjustment,
loosen setscrews
❸
to remove the cover and check the scale mark.
4. In the case the sensor sensitivity adjustment dial is set at 5 or larger value, the sensor
can be susceptible to the sewing-machine vibration or noise and can malfunction.
❸
0.5 mm
