Singer 251-2 - Page 4

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
3
DESCRIPTION
Machines
of
Class 251
produce
top
quality,
straight-line,
single-needle,
lock
stitching
1n
fabrics
as
fine
as
ladies'
lingerie
or
as
heavy
as
mens'
overcoating.
General
Features
Federal
Stitch
Type
#301.
High
Speed
(see
chart
on
page
4).
Maximum
speed
dependent
upon
nature
of
work
and
ability
of
operator.
Gear
driven,
lubricated,
Rotary
Sewing
Hook
on
horizontal
axis
makes
two
revolutions
for
each
stitch.
Upper
gears
ore
spiral-bevel.
lower
gears
ore
hypo
id-bevel.
Hook
Shaft
mounted
.160
inch
forward
of
vertical
axis
of
Needle
Bar
for
improved
stitch
formation.
Drop
Feed
guided
by
mounted
journal
bearings
to
prevent
side
movement
of
Feed
Dog.
Length
of
stitch
determined
by
a
Push-Button
Stitch
Regulator
on
top
of
machine
arm.
Regulator
includes
Locking
Device
to
prevent
changing
of
stitch
length
during
machine
operation:
(For
maximum
possible
stitch
length,
see
chart
on
page
4).
Stitch
Length
Indi-
cations
on
Machine
Pulley
ore
in
view
of
operator.
Automatic
Lubricating
System
(see
X-Ray
View
on
opposite
page).
Centrifugal
Pump
delivers
oil
under
pressure
from
Reservoir
to
all
principal
bearings.
Oil
wicks
lubricate
bearing
surfaces
in
head
end
of
ma-
chine
and
return
excess
oil
to
Reservoir.
Oil
Guard
covers
entire
path
of
Take-up
Lever.
Oil
Flow
Window,
in
direct
view
of
operator,
reveals
circulation
of
oil
inside
machine
arm.
Machine
Dimensions:
Bed
length
18-3,
1
4
inches,
width
7
inches.
Space
at
right
of
Needle
11
inches.
Machine
Head
is
supported
by
Machine
Bose
and
Oil
Reservoir,
designed
to
fit
the
cutout
in
table.
Machine
Pulley
147016.
Outside
diameter
of
belt
groove
2.90
inches
for
3/8
inch
V-belt.
Effective
diam-
eter
for
5/16
inch
round
leather
belt
is
2-3/8
inches.
When
the
machine
is
in
operation,
the
top
of
the
machine
pulley
must
always
turn
over
toward
the
operator.
Knee
Lifter,
regularly
furnished,
is
an
integral
port
of
the
Machine
Bose
and
Reservoir.