Dürkopp Adler 868-M, Руководство по эксплуатации

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Operation
Operating Instructions 868-M - 01.0 - 12/2020 69
4.16 Remaining thread monitor
Remaining thread monitor in action
Fig. 46: Remaining thread monitor in action (2)
Depending on the subclass of the machine, the hook may be fitted
with a remaining thread monitor. The remaining thread monitor
monitors the hook thread quantity on the bobbin inside the hook.
If the light beam from the light barrier is reflected off the flat (1) on
the bobbin core during sewing, the LED next to the push button
panel on the machine arm comes on. This signals that the hook
thread quantity is running low.
The remaining hook thread quantity will be sufficient to complete
the seam and change the bobbin.
Proceed as follows when the remaining thread monitor signals the
end of the hook thread:
1. Finish the seam you started.

The hook thread quantity in the supply groove (2) of the
bobbin is usually sufficient to do so.
WARNING
Risk of injury from moving, cutting and sharp
parts!
Crushing, cutting and punctures are possible.
Only change the hook bobbin with the machine
switched off.
(1) - Flat (2) - Supply groove
②
①