Checking And Adjusting Aid - Pfaff 487 Service Manual

2

Checking and adjusting aid

.05
Fig. 2 - 01
Turn the balance wheel until the needle bar is roughly in the required position.
Insert the blocking pin in the required hole and press against it.
Turn the balance wheel slightly back and forth so that the pin enters the cutout in the
bearing plate behind and thus blocks the machine.
Hole 1 = = = = = 0.6 mm past top dead centre of the needle bar (0.6 past t.d.c.)
Hole 3 = = = = = 0.6 mm past bottom dead centre of the needle bar (0.6 past b.d.c.)
Hole 4 = = = = = 1.8 mm past bottom dead centre of the needle bar (needle rise position)
Hole 5 = = = = = top dead centre of the needle bar (t.d.c.)
Hole 6 = = = = = 4 mm past bottom dead centre of the needle bar (4 past b.d.c.)
By blocking holes 1 to 6 with a pin it is possible to accurately fix the required
needle bar positions.
3
4 6
1
5
Adjustment
2 - 2