Setting The Looper Thread Guides Of The Two Thread Chainstitch Looper - Pfaff Coverlock 4772 Service Manual

32. Setting the looper thread guides of the two thread chainstitch looper

Requirement 1:
When the upper overedge looper is at its lowest position, the large looper thread guide 52,
in its standard setting, should have a clearance of approx. 0.5 mm to the raised part 53 of the base
plate (figure 56).
Setting:
G Turn the handwheel in the normal direction, until the overedge looper is in its lowest position.
G Loosen the screw 54.
G Move large looper thread guide 52, until it clears the raised part 53 of the base plate by 0.5 mm.
G Tighten the screw 54.
Test:
G As desribed under "Requirement".
Requirement 2
The small looper thread guide 55 should be set in the standard setting as seen in figure 56.
Setting:
G Loosen the screw 56
G Move the small looper thread guide until the eye of the looper thread guide is centered
to the fastening screw 57.
G Tighten the screw 56.
Test:
G As described under "Requirement".
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