Duerkopp Adler 558 Service Instructions Manual page 66

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Caution Risk of Injury !
Pull the mains plug before adjusting.
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Bring the machine into the end position.
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Remove the clamping plates.
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Loosen the mounting screws 2 for the thread gripper.
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Set a clearance of 49 mm between the left edge 1 of the clamping
plate and the right edge 3 of the thread gripper.
ATTENTION !
If the thread gripper is too far to the right, that is, over the needle plate
surface, there is a danger of breakage during the turning movement
of the hook block.
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First tighten the mounting screws 2 slightly.
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Position the clamping plates.
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Slide the thread gripper until a clearance of about 0.3 mm to the
thread seperator 4 is reached.
To check the clearance manually swing the thread seperator 4 to
the left.
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Remove the clamping plates.
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Check the clearance of 49 mm between the edges 1 and 3 again
and correct if necessary.
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Tighten mounting screws 9.
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Align the operator 5 in its height so that the clamping spring 6 is
opened suitably for the underthread thickness used.
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Set the pressure of the cClamping spring 6 through dressing so
that the underthread is held slightly clamped after cutting and does
not jump back.
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