Operation
Operating manual 171/173 Version 01.0 - 01/2016 27
5.5 Threading twin-needle machines
Twin-needle machines have a second tensioning wheel and
a second thread guide on the machine arm, to accommodate
both the needle thread and the looper thread.
Fig. 12: Threading twin-needle machines
The thread puller and the other thread guides on all machines
have two holes so that two threads can also be threaded.
The threading procedure corresponds to that for the single-needle
mach
ines:
• 5.3 T
hreading the needle thread, pg. 21
• 5.4 T
hreading the looper thread, pg. 24
Important: Take
care when threading the machine that
the threads do not cross over one another.
Risk of injury from the needle point
and moving parts.
Switch off the sewing machine before threading.
WARNING
(1) - 2nd Needle thread guide
(2) - 2nd Needle thread tensioner
(3) - 2nd Looper thread guide
(4) - 2nd Looper thread tensioner
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