Check And Adjustment Aid - Pfaff 918 Adjustment Manual

Adjustment
1

Check and adjustment aid

.04
● Turn the balance wheel until the needle bar has approximately reached the required posi-
● Place the 5 mm blocking pin in the appropriate hole and put pressure on it.
● Turn the balance wheel forwards and backwards a little until the blocking pin moves into
Hole 1 = 2.0 mm after the bottom dead center of the needle bar (2.0 past tdc)
Hole 2 = Top dead center of the needle bar (tdc)
Hole 3 = 0.25 mm after the top dead center of the needle bar (0.25 past bdc)
Hole 4 = 1.0 mm after the top dead center of the needle bar (1.0 mm past tdc)
Hole 5 = 4 mm after the bottom dead center of the needle bar (4.0 past bdc)
6
By blocking with holes 1 - 5 the required needle bar positions can be fi xed ex-
actly.
Fig. 1 - 01
tion.
the slot in the crank behind the bearing plate, thus blocking the machine.
4
3
1
2
5