Feeding Motion Of The Main And Differential Feeds - Pfaff 939 U Adjustment Manual

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Feeding motion of the main and differential feeds

.05.27
Requirement
With the maximum stitch length set and the needle bar positioned 1.0 after t.d.c. (hole 4),
when the reverse stitch key is operated, there should be no feeding motion of the main
and differential feed dogs.
Fig. 1 - 28
● While constantly operating the reverse stitch key, adjust the main feeding eccentric 1
(screws 2) in accordance with the requirement (the cutout on feeding eccentric 1 must
be visible).
● While constantly operating the reverse stitch key, adjust the differential feeding
● eccentric 3 (screws 4) in accordance with the requirement (the cutout on feeding eccen-
tric 3 must be visible).
Eccentric 1 and 2 should not be axially displaced.
Justierung
2 4
1
3
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