38 PFAFF
41 Needle thread tension release
Requirement: When the presser bar lifter is raised, the tension disks must be 0.5 mm apart
(Fig. 1).
Tension actuator 1 (screw 2).
42 Thread check spring and thread regulator
Requirement: Thread check spring stroke = 5 to 7 mm
Thread regulator 3 (Fig. 2) must be roughly in the middle.
Both adjustments depend on the thread and the material and may deviate
slightly from this basic setting.
.1 Check spring stroke: loosen clamp plate (screws) and and turn thread tension accordingly.
.2 Thread regulator 3 (screws 5).
43 Bobbin winder
Requirement: When the bobbin winder is engaged, the winding spindle must be driven
reliably.
When it is disengaged, friction wheel 6 (Fig. 3) must not touch winder
driving wheel 7.
Axial adjustment of bobbin winder driving wheel 7 (screws 8).
Requirement: The bobbin winder must switch off automatically when the amount of
wound thread is about 1 mm from the edge of the bobbin.
Adjust pin 9 (screw 10).
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