Adjustment Wheels For Differential Feed (Only On The Pfaff 939 U) - Pfaff 939 U Instruction Manual

Adjustment
12 Adjustment wheels for differential feed
.05.14
● Loosen screws 1.
● Turn both adjustment wheels 2 until guide pin 3 is in the middle of the connecting link.
● Turn both scale rings in accordance with the requirement and tighten screws 1.
12 - 16
Requirement
With guide pin 3 in the middle of the connecting link and the ends of the toothed racks 4 flush
with each other, the zero markings on the adjustment wheels 5 must be at marking 6.
1
5
6
2
Fig. 12 - 15
The ends of the two toothed racks 4 must be flush with each other.
(only on the PFAFF 939 U)
4
3