Setting The Timing Of The Lower Overedge Looper - Pfaff Coverlock 4772 Service Manual

12. 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.
A new needle system EL*705 Nm 90 must be used for all the following steps.
Check:
G Turn the handwheel until the needle bar is in 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 4 is positioned on the left
edge of the needle A (figure 22).
G Push the needle rise clamp up against the machine's housing and secure lightly,
paying attention to the correct positioning.
G Turn the handwheel in the opposite direction to the normal direction (figure 23)
until the needle rise clamp rests against the machine's housing.
G The looper point 4 must now be exactly positioned on the left edge of the right needle,
when the handwheel is turned back and forth.
Setting:
G Slightly loosen both screws 5 of the drive eccentric 6 (figure 24).
G Attach the needle rise clamp again and repeat the operation as described under "Check".
G Turn the drive eccentric 6 until the looper point is on the left edge of the right needle.
G Tighten both screws 5 of the drive eccentric 6.
Test:
G As described under "Requirement".
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