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Requirements for adjusting the coverlock 4872
Requirement:
When the needle is at its lowest position, the lower overedge looper must be at the left point of reversal
and the upper looper point, in the downward movement, approx. 5 mm below the needle plate.
The two thread chainstitch looper is at the right point of reversal, when it is at its lowest position.
The eccentrics are set in accordance with the illustrated figures to provide the adjusting requirements.
Check:
1. The screw “a” of the retaining collar 2 must be in line with the screw of the drive eccentric 1 (fig. 6).
The main shaft must not have any axial play.
Turn the handwheel (90°) in the opposite direction of the normal direction. Check whether the screw of
the retaining collar 2 and the eccentric 3 are aligned (fig. 5).
2. Turn the handwheel in the normal direction until the needle bar is at its highest point (fig. 1).
Check the position of the counterweight A in accordance with fig. 2.
Note:
When the eccentric 3 is set correctly, it is possible to see the fastening screw from above (fig. 3).
3. Turn the handwheel (180°) in the normal direction. Check that the counterweight 9 and the eccentrics
7 and 8 are set in accordance with fig. 4.
4. Turn the handwheel (180°) in the normal direction. Check that the screw “a” of the retaining collar and
the screws of the eccentrics 1,6 and 7 are set in accordance with fig. 6.
5. Turn the handwheel (90°) in the normal direction. Check that positions of the eccentrics 1 and 4 are
set in accordance with fig. 7.
6. Turn the handwheel (90°) in the normal direction. Check that positions of the eccentrics 4 and 5 are
set in accordance with fig. 8.
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