Pfaff 1491E1 Instruction Manual page 126

Adjustment
13 - 49
2
Fig. 13 - 44
When the scissor is advancing, the thread trapper must first trap and hold the threads on
the scissor ( if necessary adjust the thread trapper as required after loosening retaining
screw 4 ).
As the process continues, both the bobbin thread and the part of the thread loop closest
to the scissor which is held by the catching lug must be cut reliably.
If the threads are not cut or not cut cleanly check chapter 13.07.14 Scissor drive bar
again.
Carry out a check in accordance with the requirements.
3
4
1