Setting The Looping Stroke - Duerkopp Adler 579 Service Instructions Manual

15. Setting the Looping Stroke

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Caution Risk of Injury!
Set the looping stroke only in the "Safe Stop" position or with the
machine turned off.
Rule and Control
With looping stroke, one means the distance that the needle bar
travels from its lowest position up to the point at which the left or right
looper tip lies at the center of the needle.
In the looping stroke position the looper tip must lie at the center of the
needle.
Turn the handwheel in the direction of rotation until the needle is at
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the lower dead center.
Measure the clearance from the edge 1 up to the needle bar 2 with
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a caliber gauge.
Reduce the dimension on the caliber gauge by 2.7 mm.
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Set the caliber gauge with the reduced dimension on the edge 1.
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Slowly continue to turn the handwheel in the direction of rotation
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until the needle bar touches the caliber gauge.
The needle bar is in the looping stroke position.
Repeat the same procedure for the second looper.
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With both loopers, the looper tips must lie at the center of the
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needle in the looping stroke position (see illustration at left).
Correction
Turn the set collars so that both looper points have the same
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clearance to the needle.
Set the left and right looper so that both looper points lie in the same
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position to the needle in the looping stroke position. That is, both
looper points lie either equally far in front of or behind the needle.
Loosen screws on the set collars 3 and 4.
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By turning the set collars, set the looper position as described.
Tighten screws 3 and 4.
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The looper turret must still be able to easily turn after the tightening
of the screws.
If the the looper points do not lie at the center of the needle, loosen
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the screws on the right cam 5.
Turn cam 5 until the looper points lie at the center of the needle.
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Tighten the screws on the cam 5.
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