Advancing Movement Of The Top Feed - Duerkopp Adler 550-12-12 Service Instructions Manual

6.4 Advancing Movement of the Top Feed

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To bunch additional width the top feed and the differential feed dog
(left feed dog carrier) must together be set larger than the main feed
dog (right feed dog carrier). The length changes are effected by the
step cylinder. Setting occurs with the keys on the controls.
By length changes the stitch regulator guide is slewed by the step
cylinder and thus the stitch length of the main feed dog changed. Via
the clamping hub and lever the stitch regulator guide for the top feed is
changed at the same time.
Caution Risk of Injury !
Turn off main switch before adjusting.
In order to achieve a synchronized resetting of the stitch lengths of the
differential feed dog (left feed dog carrier) and of the top feed the
following settings must be made:
Transport length of the top feed foot
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Set the bottom Feed correctly (see chapter 3.).
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Replace the step cylinder with gauge 1 or set the controls to an
additional width of " 0 ".
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Loosen screw 4.
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Place gauge 5 on the pin of the clamping hub 3.
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Turn the clamping hub so that the lower edge of the gauge 5 is
flush with the lower edge of the block 2.
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Tighten screw 4.
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Remove the arm cover.
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Loosen screw 7.
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Set clamping hub 6 on the stitch regulator guide synchronized to
the bottom Feed.
Stitch length 2.5 mm at 2 800 min
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Tighten screw 7.
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Attach the arm cover.
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