Check And Adjustment Aid - Pfaff 918 U Instruction Manual

Adjustment
12

Check and adjustment aid

.04
● Turn the balance wheel until the needle bar has approximately reached the required
● 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
Hole 1
Hole 2
Hole 3
Hole 4
Hole 5
12 - 2
By blocking with holes 1 - 5 the required needle bar positions can be fixed
exactly.
Fig. 12 - 01
position.
into the slot in the crank behind the bearing plate, thus blocking the machine.
= 2.0 mm after the bottom dead center of the needle bar (2.0 past tdc)
= Top dead center of the needle bar (tdc)
= 0.25 mm after the top dead center of the needle bar (0.25 past bdc)
= 1.0 mm after the top dead center of the needle bar (1.0 mm past tdc)
= 4 mm after the bottom dead center of the needle bar (4.0 past bdc)
4
3
1
2
5