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10. CAUSES AND CORRECTIVE MEASURES AGAINST TROUBLES WITH
THE BOBBIN THREAD REMAINING AMOUNT DETECTING DEVICE
Phenomenon
Cause
Corrective measure
1) The bobbin thread
remaining amount
detecting function
fails to work even
when the bobbin
thread has run
out.
①
The bobbin thread remaining
amount adjusting counter has been
improperly set.
○
Check the specified data on the bobbin
thread remaining adjusting counter “
”.
If the value of “
” is excessive,
bobbin thread will run out before bobbin
thread remaining amount detection count-
up occurs.
Refer to
THREAD AMOUNT ADJUSTMENT
COUNTER" p. 39
.
②
The start position of bobbin wining
is defective.
○
Start winding a bobbin from the recess
designated.
③
The sensor amplifier fails to turn
ON/OFF because of the stained
lens.
○
Check whether the solenoid valve for the
bobbin thread remaining amount detecting
device operates normally.
○
Wipe clean the lens surface of the optical
fiber unit.
④
Sensor unit installing position.
○
Check that the spot of sensor light irradi-
ates the position of reflecting tape of bob-
bin.
⑤
The bobbin used is not the ex
-
clusive one for the bobbin thread
remaining amount detecting device.
○
Use the exclusive bobbin for the bobbin
thread remaining amount detecting device.
⑥
The bobbin case used is not the
exclusive one for the bobbin thread
remaining amount detecting device.
○
Use the exclusive bobbin case for the
bobbin thread remaining amount detecting
device.
⑦
The bobbin winder fails to wind the
bobbin uniformly.
○
Properly adjust the bobbin winder.
⑧
The sensor cable connection fail-
ure.
○
Check how the sensor scale and MAIN
circuit board are connected.