Singer 331K4 - Machine Description; Machine Installation; Machine Speed Specifications; Machine Pulley Details

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
DESCRIPTION
Machines
331K1
and
331K4 produce
top
quality,
single-needle, straight-line lock stitching
in
suits, shirts,
skirts
and
other
clothing.
MACHINE 331 K 1 :
Stitch Type #301.
Central bobbin.
Short
beak,
oscillating shuttle on horizontal axis.
Link
take-up.
Thread
take-up
lever
guard.
Drop
feed.
Hinged presser foot 161066.
Feed
dog
149603.
Throat
plate
26606.
Length
of
stitch controlled
by
regulator thumb screw
on front
of
machine arm.
Maximum stitch
length-5-1
/3
to the
inch.
Front, intermediate
and
rear
plain bearings.
Clamp
type
needle
bar.
Tapped
hole
and
seat
in
rear
of
arm provided for
mounting light fixture independently
of
presser
bar
lifting lever hinge screw.
Needle
bar
stroke
is
1.472 inches.
Clearance
under presser foot
is
5/16
inch.
Machine dimensions: Bed length
18-3/4
inches,
width
7
inches.
Belt guar,d 174112
available
on
order.
Knee lifter 139625 regularly supplied.
3
MACHINE 331K4:
Similar to
Machine
331
K 1, with the following
exceptions:
Spring-biased, quick reversible
feed
mechanism
permits
operator
to
feed
work
backward
or
forward
at
will.
Solid presser foot 12144.
Feed
dog
149304. Throat
plate
12414.
INSTALLATION
Before placing the machine
in
its
cut-out on
table,
see
that
the four cushioning
pads
are
at
the four cor-
ners
of
the cut-out. Place the machine on these
pads.
SPEED
The maximum
speed
for these machines
is
2200
stitches
per
minute, according to the material sewn
and
the
type
of
work being done.
It
is
advisable
to
operate
these machines
at
a more
moderate
speed
the first few
days,
after
which they
can
be
operated
at
maximum
speed.
Reduce speed
of
machine when sewing closely
woven fabrics
or
treated
materials.
MACHINE
PULLEY
Machine pulley 139724 (solid discs,
balanced)
has
an
outside
diameter
of
belt
groove
of
2.90
inches
for
3/8
inch
V-belt. Effective
diameter
for
5/16
inch
round
leather
belt
is
2-5
/ 16 inches.
When
in
operation, the
top
of
the machine pulley
must
always
turn
over
toward
the
operator.