Needle Bar Rotation Center - Duerkopp Adler 558 Service Instructions Manual

35. Needle Bar Rotation Center

The machine arm is aligned at the factory so that the needle bar
rotation center and hook block rotation center lie over each other. This
position is secured by the centering screw 1 and the setting pin 3.
The needle bar rotation center is correctly aligned when the clearance
between needle and hook tip always remains constant during the
needle bar and hook block rotation (see illus. ).
Caution Risk of Injury !
Pull the mains plug before adjusting.
For checking turn the handwheel until the left hook tip lies at the
needle center. Check the clearance between needle and hook tip in the
following positions:
1. In the hook block base position.
2. Hook block turned 90° with the hand crank.
3. Hook block turned 180° with the hand crank.
When there are different clearances in the three Positions:
–
Loosen mounting screws 2 and centering screw 1.
–
Loosen the securing screw 4 for the setting pin 3.
–
Tighten the centering screw 1 again and then loosen slightly.
–
Turn the setting pin 3 clockwise until touching.
–
Tighten securing screw 4.
–
Tighten centering screw 1.
–
Tighten mounting screws 2.
–
Check the clearances between needle and hook tip again.
By differing clearances:
–
As an exception loosen the yellow-sealed screws 5.
–
Through careful aligning of the upper needle bar bushing set the
correct clearances.
–
Tighten screws 5.
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