Beisler 739-23-1 Service Manual - Manual (Page 15)

2.11 Thread scissors
To replace and adjust the blades, dismantle the tread scissors.
Caution! Risk of injury!
Before dismantling the thread scissors, switch off the main switch.
Dismantling of thread scissors
–
Swivel machine head to the left.
– Pull out hose 1.
– Unscrew screws 2 and 3, remove thread scissors and disconnect
the hoses 4 and 5.
Installation of thread scissors
–
Connect hoses 4 and 5.
– Insert thread scissors carefully and tighten screws 2 and 3.
The hook-shaped blade of the thread scissors must run at the
centre of the slot in the throat plate!
– Connect hose 1.
Operational test of thread scissors
The functioning of the thread scissors can be tested by pressing key
“1" at the operating panel.
–
Pull needle and bobbin threads to the left.
– Press key “1" at the operating panel.
The thread scissors are lifted for a short moment.
– Pull needle and bobbin threads through the gap below the thread
scissors.
Both threads are cut and then held by the blades.
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1 3 2
5 4