Checking And Adjustment Aid - Pfaff 481 Service Manual

Checking and adjustment aid

By inserting the cylindrical pin in one of the adjustment holes 1 to 6 it is possible to fix the
required needle bar positions very precisely.
Turn the handwheel until the needle bar is roughly in the required position.
Insert the 5 mm thick cylindrical pin in the specified adjustment hole and press against it.
Turn the handwheel slightly to and fro until the cylindrical pin engages in the crank recess
behind the bearing plate, thus blocking the machine.
Adjustment hole 1 = 0.6 mm past top dead center of the needle bar (0.6 past t.d.c.).
Adjustment hole 3 = 0.6 mm past the bottom dead center of the needle bar (0.6 past b.d.c).
Adjustment hole 4 = 1.8 mm past the bottom dead center of the needle bar (needle rise position).
Adjustment hole 5 = top dead center of the needle bar (t.d.c. N).
Adjustment hole 6 = 4 mm past bottom dead center of needle bar (4 past b.d.c).
6
3
4
1
5
3