SPECIAL
INSTRUCTIONS
FOR
MACHINE
271K2
DRIVING
ARM
SAFETY
Driving
arm
safety should prevent cutting
blades
from
getting under needle during sewing.
SETTING: Loosen screws shown in Fig. 95.
Set
upper
thread cutting blade
driving
arm
safety
on cutting cam, so that flange-edge of safety
just clears inside edge of
cam
follower,
during
full
cycle of
feed
wheel
shaft as
shown
in
Fig.
95, while still permitting cam follower to clear
end of flange-edge of safety
when
machine en
ters "stop" position, as
shown
in
Fig. 92, page
35. Securely retighten screws.
NEEDLE
THREAD TENSION
RELEASE
To allow thread to be pulled off for trimming,
adjust sleeve,
shown
in Fig. 96, to relieve ten
sion
on
thread
between
discs
when
machine
is
In
"stop"
position.
NEEDLE
THREAD
PULL-OFF
To
ensure
sufficient
loose
thread
for
trim
ming and for starting next buttonhole, adjust
needle thread pull-off roller
arm
to activate pull-
off
for
an approximate one inch stroke at pull-
off
end
on
return
of
knife
bar.
36
LOOSEN
2
SCREWS
TO
ADJUST
DISCS
ROLLER
ARM
FOLLOWER
ARM
JUST
CLEARS
CUTTING
CAM
FLANGE
OF
DRIVING
ARM
SAFETY
Fig. 95. Setting
Driving Arm Safety
LOOSEN TO
ADJUST SLEEVE
Fig.
96.
Needle
Thread
Tension
Release
Fig.
97.
Needle
Thread
Pull-off
PULL
OFF
LOOSEN
TO
ADJUST
KNIFE
BAR
n
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