Bobbin Case Opener Position - Pfaff 918 Instruction Manual

12

Bobbin case opener position

.05.21
Requirement
1. There must be a clearance of 0.5 mm between the top edge of the bobbin case
opener and the inner edge of the bottom section of the bobbin case.
2. Between the bobbin case opener finger and the bottom section of the bobbin case
opener there must be a clearance of 0.8 mm.
3. At the left point of reversal of the bobbin case opener the bobbin case positioning-finger
must be approx. 0.3 mm from the right side of the groove in the bottom section of the
bobbin case.
Fig. 12 - 22
Loosen screw 2.
Place bobbin opener 1 on the right side of the bobbin case base, press it against clamp
crank 3 located underneath this and slightly tighten screw 2.
Adjust eccentric bearing bush 4 (screw 5) in accordance with requirements 1 and 2.
Adjust bobbin opener 1 in accordance with requirement 3 and tighten screw 2, taking
care to see that bobbin opener 1 is touching clamp crank 3
0.8 mm
0.3 mm
1
2
3
4
5
Adjustment
12 - 23