NUMBER OF STITCHES
IN
BUTTONHOLE
{See Fig. 26)
The
number
of
stitches
in a
buttonhole
is
controlled by the
set
of stitch regulating gears
selected
for
use.
IMPORTANT: To avoid disturbingthe timing
of the machine, do not permit any of the gear
shafts
to turn, while changing stitch regulating
gears.
To change the
stitch
regulating gears, move
retainer, shown in Fig. 27, out of way and re
move each
stitch
regulating gear by lifting it
off
its
shaft. Select the desired
set
of gears
from
chart on page 13, noting, that for a finer
range of stitching, upper feed-ratchet gear and
feed driving gear may also require changing.
To change upper feed-ratchet gear, remove
cap screw, retainer, spring
and
washer,
shown
in Fig.
27
and
lift out gear. Select correct
upper
feed-ratchet gear, as listed in chart on page 13.
Place this gear
upon
its shaft and replace
washer, spring, retainer and cap screw
in
that
order.
To change feed driving gear, loosen
its
eccentric
stud
socket
screw, shown in Fig. 27.
Remove
eccentric
stud.
Gear will
slide
side-
wise and out. Replace with selected gear. Re
place eccentric stud and tighten socket screw.
Replace the selected stitch regulating gears
on their
correct
shafts,
as
listed
in
chart
on
page 13.
Make
certain that slot on bottom hub
of each gear engages
its
corresponding lug on
gear
seat.
The eccentric studs, serving as gear shafts
for
feed-ratchet
gears and feed driving gear,
permit
the resetting of the spacing
between
the
gear teeth,
whenever
gears are changed. These
studs, shown in Fig. 26, ore identified
by
the
screwdriver slot on top end. To adjust, loosen
the
eccentric
stud
socket
screws,
shown in
Fig.
27. Turn eccentric studs as required to avoid
possible
binding
or
unnecessary
play.
Securely
tighten socket screws.
12
TIMING
MARK
UP
STOP
CAM
HOOK
DRIVING
CONNECTION
BELT
PULLEYJ
GEAR
FEED
DRIVING
BEVEL
PINION
FEED
DRIVING q
BEVEL
GEAR
FEED
DRIVING
PINION
STITCH
REGULATING
GEARS
\
DRIVING
driven!
/
FEED
DRIVING
GEAR
eccentric
STUDS
FEED
ratchet
gears;
UPPER
lower
NEEDLE
BAR
FRAME
DRIVING
GEAR
Fig. 26. Gear Train at 'Stop' Position
ECCENTRIC
STUD
WASHER
UPPER
FEED
RATCHET
GEAR
SCREW
ECCENTRIC
SPRING
STUD
SOCKET
SCREWS
LUG
FEED
DRIVING
GEAR
Fig.
27.
Changing
Feed
Driving
Gears
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