44
*
. MAINTENANCE
1. Replacing the reflection label of the material end sensor
2
Setscrew
1
Chain-off thread
presser plate
Counter
knife
0 to 1 mm
Counter knife
should not
protrude from
the end face.
WARNING :
To protect against personal injury due to abrupt start of the machine, conduct maintenance works with
the power turned off.
The reflection label is always in touch with the sewing product. This causes the surface of the label to wear
to impair the reflection performance of the label. If the label has worn out, it has to be replaced with a new
one. In the case where the label loses the reflection performance, the sewing machine can operate with no
material placed on the machine at the start of sewing or cannot produce soft-chain type chain-off thread. In
this case, the chain-off thread rolling-in function will fail to work. If the reflection performance of the label
cannot be resumed by adjusting the sensor, be sure to remove the worn-out label and adhere a new one on
the cloth plate.
1) Peel off the reflection label from the cloth plate.
2) Degrease the surface of the cloth plate on which the label has been adhered and adhere a new label
there.
After the reflection label is replaced, adjust the sensor sensitivity.
See
“
^
-6-(4). Adjusting the sensitivity of the luminescence sensor”
for the adjusting
procedure of the sensor sensitivity.
When attaching the counter knife, attach the counter knife so that it comes in contact with the
bottom face. If the chain-off thread presser rises, retaining of the chain-off thread cannot be
performed well.
When the sharpness of the counter knife to cut the chain-off thread has been deteriorated, replace the
counter knife.
Perform the work with care so that your finger or the like is not cut with the counter knife when replacing the
knife.
1) Hold up and turn the chain-off thread presser plate
1
to see the counter knife.
2) Loosen the setscrews
2
and replace the counter knife.
WARNING :
To protect against personal injury due to abrupt start of the machine, conduct maintenance works with
the power turned off.
2. Replacing the counter knife
Chain-off thread presser plate
Counter knife
