Setting The Movement Of The Feed Dog Stroke And The Upper Blade - Pfaff Coverlock 4872 Service Manual

8. Setting the movement of the feed dog stroke and the upper blade

Requirement:
The movement of the feed dog stroke and the upper blade must be synchronized (fig. 12).
Note:
Before any adjustments can be made, the needle bar height and the feed dog height must be set
correctly.
Check:
G Insert a new needle system ELx705 in "R1".
G Turn the handwheel in the normal direction until the needle bar is at its highest position.
G The upper blade should also be at its highest operating position.
G Carry out a visual check.
Setting:
G Turn the handwheel in the normal direction until the needle eye is positioned in accordance with fig.
13.
G Loosen the fastening screws 16 on the stroke eccentric (fig. 14).
G Turn the stroke eccentric until the markings "A" and "B" are aligned.
G Tighten the fastening screws 16 on the stroke eccentric.
Test:
G Carry out a visual check.
G Turn the handwheel in the normal direction and check that the machine runs freely.
26