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130524
6. Adjusting the sensitivity of sensors
Stitch skipping detection sensor amplifi er
7. Wiper
8. Thread hauler
Standard adjustment
No bobbin-thread
detection sensor amplifi er
Output indicator lamp
SET button
Current amount of light
received/set value
Standard adjustment
13mm - 15mm
Standard adjustment
Thrust collar
32mm
Adjustment procedures
Adjust the sensitivity of the sen-
sors with the sensor amplifi ers
mounted inside the heat cutter
control box.
1. Place thread to be used in front
of the refl ective plate. Press the
SET button shortly.
For the no bobbin-thread de-
tection sensor, press the SET
button with the refl ective plate
of the bobbin removed.
2. Press the SET button again with
the thread removed. For the no
bobbin-thread detection sensor,
press the SET button with the
refl ective plate of the bobbin
illuminated by the optical axis.
When the respective optical axes
of the sensors illuminate the cor-
responding refl ective plates, the
output indicator lamp of the corre-
sponding amplifi er lights up as long
as the sensor sensitivity is adjusted
correctly. The adjustment is com-
pleted by checking the above.
Adjustment procedures
1. Loosen the wiper
・ If the wiper is excessively spaced
mounting screw.
Adjust so that the left
end face of wiper is
spaced 13 to 15 mm
away from the center
of needle.
2. The center of the R
・ If the center of the concave sec-
section (concave sec-
tion) at the top end of
wiper has to pass the
needle tip.
3. The wiper must not
・ If the wiper comes in contact
interfere with the
needle.
Adjustment procedures
1. The standby position of the thread
hauler has to be adjusted so that it
does not interfere with the thread
which is passed between the thread
controllers Nos. 1 and 2 when the
cylinder is extruded the most.
2. Adjust the position of thrust
collar of stopper to adjust the
thread hauling amount. (Initial
value: 32 mm)
– 13 –
Results of improper adjustment
・ Faulty detection of bob-
bin thread can occur.
・ Faulty detection of stitch
skipping can occur.
Results of improper adjustment
from the needle, the remaining
length of needle thread will be lon-
ger, and if it is excessively close to
the needle, the remaining length of
needle thread will be shorter causing
slip-off of thread from needle eyelet.
tion of the wiper is not aligned
with the needle tip, faulty thread
trimming can occur.
with the needle, the needle can
break.
Results of improper adjustment
・ If the thread hauling
amount is too large, the
thread will slacken re-
sulting in faulty thread
trimming.
・ If the thread hauling
amount is too small, the
length of thread remaining
at the needle will be shorter
resulting in slip-off of the
thread from needle eyelet.
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