Pfaff 571 Instruction Manual page 61

11 Height and stroke of the bobbin case opener
.04.11
Requirement
1. The top edges of the bobbin case opener 1 and bobbin case base 3 should be on one
level.
2. When the bobbin case opener 1 has deflected the bobbin case to its furthest point, the
catch of the bobbin case should be 0.3 – 0.5 mm from the back edge of the needle
plate recess.
Fig. 11 - 11
Adjust bobbin case opener 1 (screw 2) in accordance with requirement 1.
Turn the balance wheel until the bobbin case opener has deflected the bobbin case to its
furthest point.
Adjust bobbin case opener 1 (screw 2) in accordance with requirement 2.
2
On the PFAFF 574 these adjustments must be repeated on the right post.
Depending on the thread size, a variation of the setting in Requirement 2 is
permitted.
Adjustment
3
1
1
0.3 - 0.5 mm
11 - 15