Loop Stroke And Needle Bar Height - Duerkopp Adler 195 Service Manual

2.12 Looping Stroke and Needle Bar Height
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The looping stroke is 3.5 mm.
This means:
When the needle has been raised 3.5 mm from its lowest point in the
direction of rotation the hook point must lie at the middle of the needle.
When the hook eye lies at the middle of the nneedle the lower edge of
the needle eye and the upper edge of the hook eye should be at the
same height.
Caution Risk of Injury!
Turn off main switch before adjusting.
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Insert new needle into the needle bar.
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Position and secure the machine in position E with timing pin.
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Position hook tip behind the center of the needle.
For this loosen screw 4 and adjust screws 2 and 3 accordingly.
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Remove timing pin.
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Pull plug 1 out of the hole and loosen the needle bar securing
screw.
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Adjust needle bar height such that the lower edge of the needle
eye and the upper edge of the hook eye are at the same height.
Tighten the needle bar securing screw.
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By axial displacement of the hook carrier adjust a clearance of
0.1 mm between the hook tip and the needle scarf.
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Check hook position as shown positions E+F (Section 2.10).
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