Pfaff coverlock 4872

16
Needle bar height and needle penetration points
1. Setting the needle bar height
Requirement:
The vertical clearance between the overedge needle “R1” and the top edge of the needle plate must be
12 mm when the needle bar 1 is at its upper dead center (fig. 1).
Check:
● Turn the handwheel in the normal direction until the needle bar 1 is at its upper dead center (u.d.c.).
● Insert a new needle Nm 90 into “R1”. The needle must be inserted into the needle holder 2 as far as it
will go.
● Check the needle bar height using the adjustment gauge (measurement A).
Setting:
● Remove the face cover.
● Turn the handwheel in the normal direction until the needle bar 1 is at its upper dead center (u.d.c.).
● Slightly loosen the screw 3 of the needle bar connection (fig. 2).
● Move the needle bar 1 upwards without turning it until the needle touches the adjustment gauge (mea-
surement A).
● Tighten the screw 3.
Test:
● Check the clearance.
The needle holder must be parallel to the machine housing.
● The sides of the needles “L0”, “L1” and “L2” must not touch the sides of the needle plate (fig. 3).