Adjustments In The Different Handwheel Positions - Duerkopp Adler N291 Service Manual

1.2 Adjustments in the different handwheel positions

For some adjustments the needle bar or take-up lever must be in a defined position.
This position is marked by letters on the handwheel 3 and can be locked as follows:
– Turn the handwheel into the position defined for the adjustment.
– Slide the timing pin 1 into the hole 2 of the housing.
– Turn the handwheel slightly forward and backward until the timing pin can be slid all the way into the
respective slot of the adjustment disk 4.
Only with position F the pin must rest against the respective side of the cutout.
Slot Position
A Needle bar 2 mm behind the
lower dead point
B Needle bar nearing its upper
dead point
C Take-up lever nearing its upper
dead point
D Take-up lever nearing its lower
dead point
E Needle bar at the lower dead
point
F Shortly behind the loop stroke
6
Adjustment
– Position of the adjustment disk on the arm shaft
– Loop stroke
– Needle bar height (without gauge)
– Distance between the hook and needle
– Timing of the feeding foot feed travel (with
gauge)
– Position of the thread trimmer cam
– Timing of the feeding foot stroke motion
– Setting the reference position of the
synchronizer
– Distance between the feeding foot bar and
sewing foot bar
– Checking the timing of the feeding foot feed
travel
– Needle bar height (with gauge)
– Timing of the feed dog feed travel
– Synchronizer (1st position)