Gripping Movement - Duerkopp Adler 558 Operating Instructions Manual

5.5.4 Gripping Movement

Bringing the thread gripper in gripping position
After sewing the left buttonhole seam the thread gripper 3 must be set in the precise
gripping position for the upper thread.
–
Turn the handwheel until the sewing sequence for the left buttonhole seam is
completed and the handwheel catches.
–
Turn the material support plate with the hand crank about 14 mm farther.
For this measure the distance between bearing block 2 and machine arm 1.
If the measured distance is e.g. 21.5 mm, then we get a distance to be set of 7.5
mm by subtracting 14 mm.
–
Move the bearing block 2, by turning the hand crank, toward the machine arm 1.
Opening width
If, in gripping position, the magnet is operated manually, then the opener lever 9 must
glide onto the front of the opener 7 and open the thread gripper 3.
The opening width of the thread gripper should thereby be 3 - 3,5 mm.
–
Set the opener 7 more or less in the path of the opener lever 9 by turning the
setting screw 6.
Position the thread gripper
The upper thread to be caught must, with lowered and opened thread gripper 3, lie in
the center of its opening.
–
Set the thread gripper by turning the setting screw 5.
The screw 5 is hidden in the illustration by the lever.
Timing of the closing
The closing of the thread gripper 3 should only occur shortly before reaching the lowest
position of the thread catcher.
At the end of the slewing movement of the thread catcher in the direction of the needle
the pin 8 should have moved past the upper thread approx. 2 mm.
The timing of the closing is determined by the opener 7.
–
Loosen screws 4.
–
Set the opener 7.
Opener higher = earlier closing
Opener lower
–
Tighten screws 4 again.
–
Check the timing of closing by slow manual lowering of the magnet.
= later closing
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