Setting The Timing Of The Lower Overedge Looper - Pfaff Coverlock 4872 Service Manual

11. Setting the timing of the lower overedge looper

Note:
The timing of the lower overedge looper is set by turning the handwheel back and forth.
This method guarantees a 100 % setting.
This is very important for machines with double eccentric for the overedge and two thread chainstitch loo-
pers.
Check:
G Turn the handwheel until the needle bar is at its lowest position.
G Push the needle rise clamp (00-870 137-01) over the needle bar.
G Turn the handwheel in the normal direction until the looper point 2 is positioned in the exact middle of
the needle "R1".
G Push the needle rise clamp up against the machine's housing and secure lightly (fig. 20).
Pay attention to the correct positioning!
G Turn the handwheel in the opposite direction to the normal direction (fig. 21) until the needle rise
clamp rests against the machine's housing.
G The looper point 2 must now be positioned in the exact middle of the right needle, when the hand-
wheel is turned back and forth (fig. 20).
Setting:
G Slightly loosen both screws 7 on the drive eccentric (fig. 22).
G Attach the needle rise clamp again and repeat the operation as described under "Check".
G Turn the drive eccentric until the looper point is in the middle of the rear of the right needle.
G Repeat this procedure, until the setting is correct.
G Tighten both screws 7 of the drive eccentric.
Test:
As described under "Requirement".
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