Pfaff 3811-3/55 Instruction Manual page 108

Adjustment
13 Knife height
.07.04
 Adjust the knife 1 (screw 2) according to the rule.
108
Rule
At the knife 1 reversal point, the front edge of the knife 1 should be approximately 0.5 mm
below the upper edge of the stitch plate.
2
Fig. 13 - 39
1
1