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SPECIAL
INSTRUCTIONS
FOR
MACHINE
271K2
CUTTING
LEVER
CAM
FOLLOWER
CONNECTION
FEED
WHEELS
SHAFT
GUIDE
PLATE
FLANGE
EDGE:
^'
OF
DRIVING
ARM
SAFETYK^^,
Fig. 92. Setting Upper
Thread Cutting Cam Follower
CLAMP
SCREW
STOP
ROD
SEWING
SAFETY
LEVER
ROLLER
Fig.
93. Setting Sewing
Safety
Lever
CUTTING
CAM
ROLLER
LOOSEN
SCREWS
TO
ADJUST
FEED
mEEL
SHAFT
CUTTING
CAM
FOLLOWER
Fig.
94.
Timing Upper
Thread
Cutting
Cam
UPPER
THREAD
CUTTING
CAM
FOLLOWER
Upper thread cutting com follower shouldbe
set
to assure trimming action while preventing
guide screw
from
striking end of
slot
in guide
plate.
SETTING:
With
machine in
"stop"
position,
loosen screw in
slot
of upper thread cutting
lever connection, shown in Fig. 92. Set body of
cam follower flush against feed wheel shaft, to
hold guide screw on cutting blades approximately
1/64
inch
from
end of slot in upper thread cut
ting plate guide plate
as
shown. Securely re-
tighten screw.
SEWING
SAFETY
LEVER
Sewing safety lever should be
set
so that
trimmed
end of thread will be held in position
forcovering.
SETTING:
With
machine in
"stop"
position,
loosen clamp screw, shown in Fig. 93 and posi
tion the sewing
safety
lever on stop rod in re
lation to the upper thread cutting cam follower
so
that
1. Roller on safety lever, as machine is
set
in "run" position, will engage
cam
fol
lower,
as
shown
in
Fig.
93,
withdrawing
clamping blades 3/16 inch behind needle.
2.
Clamping
blades will avoid losing thread
at start of sewing by not withdrawing be
yond point of opening position in guide
plate.
UPPER
THREAD
CUTTING
CAM
Upper thread cutting cam should be timed to
assure
covering of trimmed end of thread while
preventing needle
from
striking trimmer blades.
TIMING:
Set machine for
maximum
length of
buttonhole. Loosen screws, shown in Fig. 94.
Turn cutting cam on feed shaft, until roller on
cam engages upper thread cutting cam follower.
This setting should start clampingblades
moving
away
from
needle,
when
point of needle is ap
proximately
1/32
inch
from
clamping blades.
35
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