S-101
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Revised 09/2004
1-22
UPPER THREAD DRAW OFF (ROCKING TENSION TYPE)
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.
Refer to sheets 4 and 5
for complete threading
diagrams.
Operation Of Upper Thread Draw Off
Tension should swing in the direction of arrow (X) immediately after the machine starts, and in
the direction of arrow (Y) when the machine is at the far end of its travel.
Adjustment Of Upper Thread Draw Off
To obtain maximum length of starting thread at
s
- make sure machine is in its normal stopping
position. Loosen screws
q
and
r
and rotate cam
p
to the point where pin
n
is at the very top
of the cam rise at
o
as shown above. Then tighten screws
q
and
r
securely.
To decrease length of starting thread at
s
adjust the position of cam
p
as required in the
direction of arrow marked less.
N o t e :
If machine is not equipped with this type of upper thread draw off, see Needle bar type
draw off on sheet 22.
r
s
p
q
o
n
CUT BEFORE - MACHINE ADJUSTMENTS