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Q4 I am worried about the hook that becomes hot.
Q5 I am worried about stains such as cloth chips, thread waste, oil, etc. (In the case the sen-
sor head, bobbin case and/or the reflective seal are frequently stained with them)
A. When you use this device, it will not be able to detect a stitching failure correctly if there are obsta-
cles such as cloth chips on the sensor light path.
If you are worried about stains such as cloth chips or if you need to clean the device frequently,
use the optional part (separately available), "air blower set (part number: 40240043) as shown in the
figure given below.
A. When you use this device, it is recommended to minimize the hook oil amount in order to maintain
and improve performance of the device.
If you worry about the hook heating, use the op-
tional part (separately available), "hook cooling
device (part number: 40250042) as shown in the
figure given below.