Pfaff 438 Series

20
Setting:
Adjustment:
20.1
.2
.3
Adjusting the slack thread control
When the needle bar is at b.d.c. the bottom edge of the slack thread controlwire must
be inline with the top edge of the hole in the threadguide(Rg. 20.0.2).
20.0.2
20.0.1
Push slack thread control wire 1 on bushing 2 and hold itin position.
Bring
the needle bar to b.d.c.
Adjust the position of slack thread control wire 1 so that its bottom edge Is In line
with the top edge on the hole in the thread guide, and make sure it is set parallel to
the bedplate.
Inthis position tighten screw 3.
Check this adjustment (see "Setting").
32
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com