Pfaff 421E1 - Bobbin Case Opener Position

Adjustment
13.04.10 Bobbin case opener position
Requirements
1. The top edges of bobbin case opener 2 and bobbin case lug 5 must be at the same
height.
2. When the bobbin case 2 is at its rear point of reversal, the bobbin case carrier 3 and
the stop spring 4 must be the width of one thread apart.
● Loosen screw 1.
● Adjust the bobbin case height in accordance with requirement 1 by moving bobbin case
opener 2.
● Bring the fixing collar to rest on bobbin case opener 2.
● Bring the bobbin case opener 2 to its rear point of reversal.
● Adjust the clearance between the bobbin case base 3 and stop spring 4 in accordance
with requirement 2 by turning the bobbin case opener 2.
● Tighten screw 1.
Fig. 13 - 09
4
5
2
1
3
thread width
13 - 13