Service manual

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Revised 09/2004
S-101
1-23
The amount of thread required to start the next buttonhole varies with the conditions and classes of
work. Usually thin work requires more thread for starting purposes than heavy work. If more than one
grade of work is passed thru the machine, it is desirable to make the adjustment on the lightest
materials.
The absolute maximum of thread that can be
drawn off is reached when disc o has
engaged the thread as illustrated in Figure
1a - and the thread lines are parallel at n
as the machine is stitching on the second
side of the buttonhole. Disc adjustment
shown in Figure 1 is the most desirable
location for average sewing.
COMBINED DRAW-OFF AND UNDER THREAD TENSION RELEASE
Note:
The lower thread tension should be fully released when machine has completed the buttonhole.
To adjust - loosen nut q (Figure 2) and raise or lower stud n a sufficient amount to overcome
the influence of the tension spring.
Tighten nut q securely.
To adjust for more or less thread - loosen
nut p (Figure 1), and swing disc o in
direction shown for the desired result.
CUT BEFORE - MACHINE ADJUSTMENTS