Pfaff 438 Series User Manual

Bobbin winder
When the bobbin winder is engaged, the winder spindle must be driven reliably; when
the bobbin winder is disengaged, however, friction wheel 3 must not contact drive
wheel 2.
The bobbin winder must stop automatically when the thread wound on the bobbin
has reached a point abt. 1 mm below its rim(Fig. 29.0.2).
29.0.2
Raise the presser bar lifterand engage the bobbin winder.
Loosen both screws 1 in drive wheel 2.
Set drive wheel 2 so close to friction wheel 3 that the bobbin winder spindle will be
driven reliably when the bobbin winder is engaged, but that friction wheel 3 will not
be driven by drive wheel 2 when the bobbin winder is disengaged.
Tighten both screws 1.
Place a bobbin on the winder spindle, thread the machine forbobbin winding, engage the
bobbin winder and start the machine.
Loosen screw 4 of stop latch 5.
If the bobbin is too full, push regulating stud 6 toward the right, if the bobbin Is not
full enough, push it toward the left.
After the adjustment, tighten screw 4.
If the thread piles up on one side of the bobbin, adjust the thread guide on the machine arm
accordingly.
Check this adjustment {see "Setting").
Finally, replace the arm
rear cover with the four screws
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

Pfaff 438 Series Specifications

General

Brand	Pfaff
Model	438 Series
Category	Sewing Machine
Language	English