Zeroing The Main Feed (Rear Feed Dog) On The Pfaff 939 U - Pfaff 939 U Adjustment Manual

1 Zeroing the main feed
.05.19
Requirement
With the stitch length set at "0", when the balance wheel is turned, there should be no
feeding motion of the rear feed dog.
Fig. 1 - 20
● Set the stitch length at "0".
● Fit the open-ended spanner (width 27) to the torsion-spring collar 1 and use it to hold
regulating shaft 2.
● Loosen screw 3.
● While constantly turning the balance wheel, adjust the spanner on the torsion-spring
collar 1 in accordance with the requirement.
● In this position, move adjustment crank 4 against the cast iron frame and tighten screw 3.
● Carry out a control in accordance with the requirement.
on the PFAFF 939 U
(rear feed dog)
3
4
Justierung
1
2
25