Hook Drive Housing; Needle Avoidance Movement Of The Hook (Ellipse Width) - Duerkopp Adler 744-122 Service Instructions Manual

7.5 Hook drive housing

Turn main switch off
- Risk of Injury -
The needle tip should point to the middle of the
hook shaft and the lower edge of the hook shaft lie
parallel to the bottom of the throat plate.
This means a clearance of 50.5 mm between the
lower edge of the hook shaft and the throat plate
rest.
Remove the throat plate and hook bearer with hook.
Loosen clamp screw 2.
Align the hook drive bearing so that the hook shaft
lies in the cutout of gauge 1, order no. 933 80203.
Tighten clamp screw 2.
7.6 Needle avoidance movement of the
hook (Ellipse width)
Turn main switch off
- Risk of Injury -
The needle avoidance movement is properly set
when, with hook movement from right to left, the
needle clearance is between 0.05 and 0.1 mm
and, with hook movement from left to right, the tip
of the downward-moving needle touches the back
of the hook at that moment when the hook and the
needle are in the position shown in the
accompanying sketch.
The exact dimension of the avoidance movement is
dependent on the needle system and the needle
thickness.
The ellipse width with this machine should be
1.9 mm. (Needle thickness Nm 90)
For adjustment slide the lower shaft in the direction
of its axis.
To the right = Ellipse width smaller
To the left = Ellipse width greater
Setting the ellipse width occurs as follows:
– Fit a straight and undamaged needle.
Screw on holder 4 and insert dial gauge 5.
A complete dial gauge set is available under
order no. 933 80207.
– Set the hook shaft 6 at its lowest point with the
handwheel. Set the dial gauge to 0.
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