Singer 81k70 User manual

SINGER

81K70,K72,K73,K76

From the library of: Superior Sewing Machine & Supply LLC

hiTln

KSHllS

IN

SrI'

I<

U(

~

T

ll)

NS

SINGER* SE

WI

N

Cl

~~1

A

c:

II

INE

~

81K70,

H1K72,

H1K73

AND

H1

I\7(J

* A

Trade

l\lad;.

of

TilE

SIN<;Jm

MA.NliFACTUIUNC

<:<>.

From the library of: Superior Sewing Machine & Supply LLC

To

all

whom

it

may

concern

:

The

impr·oper

placing

or

renewal

of

the

trade-mark

"SINGER"

or·

any

other

of

the

trade-marks

of

The

Singer

Manu-

facturing

Company

(all

of

which

are

duly

Registerer!

Trade-

mar·ks)

on

any

n)achine

that

has

been

r·cpaired,

rebuilt,

recon-

ditioned,

or

alter·ed

in

any

way

whatsoever

outside

a

Singer

factory

or

an

authorised

Singer

agency

is

for·bidden.

TilE

IMPORTANCE

OF

USING

GENUINE

SINGER

PARTS

AND

NEEDLES

IN

SINGER

MACHINES

The

successful

oper·ation

of

Singer

machines

can

only

be

assured

if

genuine

Singer

parts

and

needles

are

used.

Supplies

are

available

at

all

Singer

Agencies

for

the

Manufacturing

Trade

and

orders

will

receive

pr·ompt

attention.

Genuine

Sln~er

Needles

should

be

used

In

Sin~er

Machines.

Thes£'

Nccdl!'s

and

their

Containers

are

rnarked

with

the

Company's

Trade

Mark

SIMANCO.*

I

Nl'l'llles

In

Containers

mar·kcd

''For

Sin~er

Machines''

arc

not

Singer

made

needles.

2

DESCRIPTION

These

machines

make

either

the

two

or

t

hrce

l

hrPad

mTn'dl~~'

chain

stitch

and

trim

the

edges

of

LIH'

goods

in

advance

of t

l11·

stitching

so

!hal

Lhe

arliele

can

b!'

shaped

whilP it is

!wing

st

il

1·lwd.

They

are

automatically

oiled

by

means

of a s(•rir·s of

wicks

which

eonvey

the

oil

from

the

reservoirs

to

the

prineipallwarings.

Machine

81K70

is

fitted

with

a

gathering

feed

and

is

used

for

trimming

and

closing

seams

in

light

and

medium

m·ighl

knit

materials

and

rayon.

Machine

81K72

is

used

for

trimming

and

ovr·rPdging

ll:tntwls,

muslins,

denim

and

other

similar

materials

and

also

lor

r;tyon

where

a

gathering

feed

is

not

required.

]I is

used

lor

inserting

sleeves,

seaming

house

dresses,

l'l

e.,

also

for

stitching

Jl

1

H'

kets

into

trousers.

Machine

81

K7J

is

used

for

lrinuning,

mTn·dgin~~

;111d

cl<~:.itq•

seams

in

light

and

medium

weight.

knit

materials

and

rayon.

It

has

a

new

gathering

feed

which

ean

lw

quickly

adjusted

by

h:111d

to

regulate

the

fullness

of

gathering

on

swl'atPr

mat

nial,

or

for

rayon

where

gathering

is

nol

required.

For

loosely

knit

lr·d

sweaters,

lhe

knife

can

be

adjusted

to

trim

/',;inch

from

lhl'

111'('(111'.

Machine

81K76

is

used

for

trimming,

ove!Tdging

:llld

blind-

stitch

hemming

or

welting

in

knit

undcrw(·ar.

It

is lit l('d

11

illt

a

gathering

feed.

Note

Orders

for

the

above

machines

should

specify

lhe

class

ol

work

for

which

the

machine

is

required,

so

as

lo

insun·

fiLling l hl·

machine

with

the

parts

suitable

for

the

worlc

Speed

Important:

For

Lhe

first

week,

run

the

machirws

up

to '1000

revolutions

per

minute;

the

seeond

week

4BOO;

and

the

third

week

4500.

The

speed

of

4500

revolutions

per

minute

can

lw

main!

;1itH'd

for

long

runs.

From the library of: Superior Sewing Machine & Supply LLC

1

To

Set

Up

the

Machine

Line

up

the

machinP

on

the

table

so

that

the

lwlt

groove

of

the

balance

wheel is in line

with

the

belt

groove

of

the

driving

pulley.

To

Install

Base

132704:

By

means

of

at

Pmplale

or

other

method,

spot

and

drill live holPs in 1

he

table

before

the

base

is fastenPd

to

the

tabh•.

The

diameters

of

these

holes

arc

~

il"

for

the

three

machinl:

base

bolts,

~4"

for

the

machine

base

thumb

screw,

and

1

X"

for

the

oil

drain

pipe.

Fa.c;tcn

the

base

to

the

table

by

means

of

the

three

bolts.

Then

screw

the

drain

pipe,

from

the

underside

of

the

tablP,

into

the

drain

hole

in

the

machine

base.

Fw.

2

Be

sure

the

felt

cusmons

arc

in

place,

including

Llw

center

cushion,

llwn

set

the

machine

on

the

base.

Place

the

spring

and

washer

over

the

machine

base

thumb

screw,

put

this

screw

through

the

center

hole in the

base

from

the

underside

of

the

lablP,

and

spcurcly

lighten

the

screw.

To

Install

Lowered

Base

132705:

For

the

cut-out

in

the

I

abk,

lay

the

base

right

side

up

on

the

table

and

out.line

the

·base

with

pencil.

Cut

the

hole

~

P,"

larger

than

the

pencil

outline

so

that

the

base

will

not

touch

the

plank.

..

",ttl'ftLU

..

~~~

.

______

._.,:;_:_·~-~

--

Remove

the

three

screw

pins

from

the

base

and

with

a

center

punch,

through

lhe

serew

helPs,

make

a

spot

ntark

for

the

center

of

the

hil.

A

bit

~

s"

di-

ameter

should

br

used

and

the

three

holes

should

be

of

such

a

depth

that

the

three

rubber

cush-

ions

will

extend

~

i/'

above

the

top

of

the

table.

Replace

the

screw

pins,

and

wiH'n

placing

lhe

FIG. 3

base

in

position,

have

each

l'lller

llw hole in

the

center

or

1

he

rubbPr

cushions

as

shown.

Then

press

tlw b:1sr

down

~mtil

it

n'sts

on

the

cushions.

Tlw

oil

drain

jar

should

IH~

located

oul

of

the

operator's

way.

Fasten

llw

machine

to

the

base

as

instructed

aLuve.

Oiling

Before

Starting

the

Machine:

Apply

Singer

''OIL

FOR

HIGH

SPEED

SEWING

MACHINES

(Cloth

and

Leatlwr)"

/

I

l'IG.1.

Fnor-a

Vmw, SnoWING <liLIN(:

I'OINrs

for

general

use

or

"STAINLESS

OIL

FOI{,

IIICH

Sl'l·~l<ll

SI~\\'INC

.f\1ACIIINES"

wlwre

a

stainless

oil is

desired,

to

llw

oil holl'

(X,

Fig. 4)

and

oil

eup

(1<',

Fig.

'1)

until

the

rest•noirs

are

full. Fill

the

oil

cup

(C)

at

t

hP

top

of

the

machine

and

thor-

oughly

saturate

the

wick

through

the

hole

on

in

the

<;as

Iing

near

the

Lop

of

the

needle

bar.

Then

oil

thP

1wedle

ha:

lmk

connl;c-

lion

(.))

at

the

front

of

the

machine.

Also

apply

otl

to

tlw

kmfe

lever

and

presser

lever

bearings

(.f\1,

Fig.

G)

al

thL'

hack

of

the

machine.

Thereafter,

rPph•nish

the

oil

supply

in

llw

reservoirs

about

once

each

day,

or

often

enough

lo

keep

them

filled.

Twice

a

day

apply

oil

lo

the

remainder

of

the

oiling

points.

The

surplus

oil

drips

into

the

cast

iron

base

~nd

~his

oil.shou!d

be

occasionally

drained

by

turning

the

tap

wluch

1s

prov1ded

Ill

the

base

for

this

purpose.

Caution:

A

machine

new

from

t.he

factory,

or

one

!.hat

has

not

been

used

for

some

Lime,

should

not

be

operated

UJ?til

ab~mt

three

hours

after

filling

the

rPservoirs.

F'ailure

to

heed

th1s

cau~wn

may

result

in

serious

damage

Lo

the

nwchanism

of

the

maehme.

From the library of: Superior Sewing Machine & Supply LLC

{j

1.-w.

fi.

Hr:An

Vn:w,

;';nowiNG

Oli.ING

!'oiNT"

Needles

and

Thread

:\i•t·dlt·s

f.,r

!\Licliill<'S

Sll\7:!

:tnd

Sll\71)

;m·

of

(lass

dlld

\'aridy

Sl:d

and

:tit' llldd1·

i11

..,j;,

.

..,

S,

!1,

II.

II,

Hi,

17, IS, l!l

dlld

:?I

:\tTdks

f"r

~Licliilll'S

Sll\711

and

Sll\7:1

;JJ('

of

!');Iss

;JJHI

\';tlil'ly

Hlxl

and

Hl\1:1.

\,·,·dks

Sl\1:1

dll'

JJs,·d

<>It

J:I\IJ:I

:111d

:Ill'

lllad1~

ill

si;,·s

7,

!I

:111.!

II

The

sizP

or

llw

tH'edk

to

he

used

shoulu

be

determined

by

t

lw

size

or

tlw t

lm·ad

which

must

pass

freely

through

the

eye

of

the

tH'l'dh•.

Tlw

usc of

rough

or

uneven

thread,

or

thread

which

passps

with

dilli<·ulty

through

the

needle

eye,

will

in!Prfcre

with

t.he

proper

<IJH'ration of l

h1•

tnaC'hine.

Ordns

for Jll'edles

must

specify

the

quanlitu

required,

the

s1'ze

number,

also

the

cia~>~>

and

1•aricty

numbers,

spparatcd

by

an

x.

Tlw

l'ollowing is

an

example

of

an

intelligible

order:

"100

No.

lG,

81

x 1

Needles."

Tlw

best

resul

Ls

will

he

obtained

in

using

the

needles

fur-

nished

hy

the

Singer

S1•wing

~lachine

Company.

To

Set

the

Needle

r,oosen thl'

clamping

nul

(P,

Fig.

7)

at

the

lower

l'IHI

of

lhe

rw<·dlc

bar

and

put.

thP

needle

up

inlo

the

bar

as

far

as

it

will go,

with

the

cl<•arance

abovP

the

pye

at

the

back,

or

farthest

from

you.

Then

tighten

Uw

clamping

nut

(P).

7

Needle

Tlu-eading

un

1\larhines

81K70,

HIK72

and

HIK7.~

(For

Thn•L•-Thl·l'<lll

Stitch)

Pass

the

thread

from

the

unwinder

down

through

the

lwk

(1) in

the

tension

bracket,

from

back

to

front

through

the

lower

Fw.

G.

TmtF.ADING

Tim

NF.EDLE

hole

(2),

around

the

front

between

Llw

LPnsion

discs

(:~).

from

back

to

front

through

the

eyelet

('1),

to

the

kft.

of

the

take-up

(G),

through

the

eyPiel

(6),

down

through

the

hole

(7) in

the

thread

controller,

Lo

the

right. of

the

(8),

to

the

JpfL

belwcPn

the

thread

retainer

dises

(~)),

to

tlw

right

of

guide

(10)

and

from

front

to

hack

through

the

eye

(11) of

the

needle.

From the library of: Superior Sewing Machine & Supply LLC

R

Needle

Threading

on

Machines

81K70,

81K72,

81K73

and

81K76

(For

Two-Thread

Stitch)

A

machine

titled

for

making

the

three-thread

chain

stitch

can

he

changed

to

make

the

two-thread

chain

stitch

by

substituting

spread!·r 1326:H for llw

right

hand

looper

and

applying

tension

Un·pad guide 42082,

bracket

screw 228J,

take-up

132883

2

and

needle

t

hrrad

eyelet

42()%.

Machine

81K7(J

is

rPgularly

equip-

ped

with

thes?

parts,

PXct•pting

spreader

1:12631,

and

should

he

threaded

as

showu

in Fig.

7when

mak-

ing

either

the

two

or

three-thread

stitch.

To

Thread

the

Needle,

pass

the

thread

from

the

unwinder

clown

through

t

IH'

hole

(1) in tlw

tension

hracht,

from

hack

t.o

front

through

the

lower hole

(2),

around

the

front

lwlW!'!'ll

the

tension discs (3),

thnll'gh

the

hole (4), from

lw·k

to

front

through

tlw hole

(G)

in

the

take-up

and

from

front

to

hark

through

the

hole

(G)

in

the

needle

thread

Pyelet,

down

to

Uw

right.

of

thP

(7),

around

the

left

side

between

tlw

rC'-

tairwr

discs \H),

down

inlo

the

guide (9),

a11d

from

front

to

haek

t!trough t

lw

eye

of

the

needle

(1

0).

To

Thread

the

Left

Hand

Looper

(SEE

FIGs.

8,

\J

AND l!l)

Pass

lhr!

thread

from

the

unwinder

down

through

the

hole

(I,

Fig. 8) in

the

bracket

at

the

rear

of

the

machinP,

through

the

ho]p

(2,

Fig. 8) in

the

pull-ofT,

through

the

hole (3, Fig. 8),

down

through

the

hole (1, F'ig.

H)

in

lhe

frame

top

cover,

from

back

to

front

through

the

hole

(5,

Fig.

8)

in

the

cloth

plate

extension.

Swing

cloth

plate

(N,

Fig. 8)

to

the

lefl.

Then

pass

the

thread

up

through

the

hoiP in

the

extension

(fi,

Fig. 9),

over

helwe(•n

t

hP

tension

discs (7, Fig. 9),

from

back

to

fronl

under

the

nipper

spring

(X,

Fig. !l)

and

through

the

tube

(!l, F'ig. 9), down

1

~

l

and

from

back

to

front

through

the

thread

guide (10,

Fig.

9),

up

and

from

back

to

front

-

through

the

hole

(11, Fig.

10)

in

the

heel of

the

left

hand

looper,

and

from

front

to

back

through

the

eye

(12,

Fig.

10) of

the

left

hand.looper.

FIG. 10

g

2 3 4

Fto. 8

Fw. 9

Note:

The

pull-ofT

ancl

hraeket

(t,

2

and

:~.

Fig. S)

and

the

nipper

(8, Fig.

!l)

;m•

only

threaded

when

mak-

ing

the

three-thread

tight

stitch.

From the library of: Superior Sewing Machine & Supply LLC

JO

To

Thread

the

Right

Hand

Looper

!'ass

the

thread

from

the

unwinder,

down

through

the

hole

(A, Fig. 11) in

llw

tension

braekel,

from

baek

to

front

through

the

Flo.

11.

TunEADrNG

nm

llH;I!T

IIAND

Loorv.n

pull-otT (B, Fig. 11)

al

the

hack

of

the

machine,

up

through

lhe

hole (C, Fig.

11

),

down

through

the

hole

(D),

through

lhe

hole

(

1•:),

under

l)('lwecn

the

tension

discs

(

F,.

through

the

hole

(C),

from

haek

to

fronl

through

the

take-up

(ll),

down

under

the

loop

(.1) of

llw

slaple

LiH'n,

with

the

forefinger,

slide

the

thread

up

and

over

the

prong

(

K),

so

thal

the

thread

rests

in

baek

of

lhe

prong,

up

and

from

back

to

front

through

the

hole

(L)

in

the

heel

of

the

right

hand

loopPr,

and

from

fronl

to

back

through

Lhe

eye

(l\1) of Llll'

right

hand

looper.

Note:

The

pull-off (B,

Fig.

11)

is

only

threaded

when

mak~

ing

the

three-thread

tight

stitch.

11

To

Adjust

the

Gatlll'ring

Ft>Pd

on

Machine

HI K7.\

Tlw

amount

of

movcmPn

t of

the

rear

feed

dog

is de!

erm

inr·d

by

lhe

position

of

lhe

lever

(A)

al

the

haek

of

the

machine.

lt

~tl

F

/IV?

Fw.

12.

APJUSTINr.

THY.

CATIIEHfNr.

F~-:1m

For

more

gathering

motion,

pr!'ss

tiH·

latch

(I\) ag;tin:.l

llw

IPnT

(A)

and

move

the

IPver

upward.

For

lr•ss

g;tl IH·ring tnol ion,

move

the

lr·vcr

downward.

The

markings

on

tlw

indicator

plalr·

aid

in dttpli<":tling

:tny

parlintlar

selling.

To

Adjust

thl'

CathHing

Fl'l'd

on

l\lachinPs

HIK70

and

HIK7h

\\'hen

Yery

elastic

materials

an•

to

lw

snvn,

the

l>:wk

f(•('d

dog

should

l'l'main in

its

raised

posit ion

only

long

(•nouglt \o

permit

the

work

Lo

come

oul

flat.

To

adjust

the

gathering

fPPd, loosl'll

the

slllalll'r

sn('w

al)(l\'('

llw

regulating

thumb

screw

al

lhl'

back

of

the

machine

and

turn

the

thumb

screw

outward

for

more

galhl'r

and

inward

fur

Je~;s

gather.

From the library of: Superior Sewing Machine & Supply LLC

12

To

Regulate

the

Pressure

on

the

Material

The

pressure

on

the

material

is

regulated

by

means

of

the

thumb

screw (A, Fig. 13).

To

increase

the

pressure,

turn

this

thumb

screw

downwardly.

To

decrease

the

pressure,

turn

the

thumb

screw

upwardly.

To

Regulate

the

Length

of

Stitch

The

h•ngth of

stitch

is

regulated

by

means

of

the

adjusting

screw (H,

F'ig.l:l)

inthefPedeccentric.

Thisscrcwfacesdirectly

outward.

Fra.

13.

ADJUSTMENTs

ON

nr;;

MAcHINE

To

change

the

length

of

stitch,

turn

the

balance

wheel unti1

the

lock

screw in

the

feed eccentric

appears

in

the

hole of

the

cover

((~.

Fig. 13).

This

screw

faces

slightly

downward.

Loosen

the

lock screw.

Then

turn

the

balance

wheel

until

the

adjusting

screw

(H) is visible

through

the

hole in

the

cover

(G).

Turn

the

adjust-

ing screw

(II)

over

to

the

right

for a long

stiteh.

Turn

this

screw

over

to

the

left for a

short

stitch.

Then

turn

the

balance

wheel

over

unlilthe

lock serew

appears

and

securely

tighten

this

screw.

INSTRUCTIONS

FOR

ADJUSTERS

AND

MACHINISTS

To

Set

the

Needle

Bar

at

the

Correct

Height

Remove

the

throat

plate

in

order

lo

obtain

a c!Par

vi1·w

of

the

needle

and

looper.

Now

turn

the

balance

wheel over from you unl

il

l

h1·

IHTdlt•

bar

has risen 332 inch from

its

lowest position.

ThP

point of t

ht•

left

hand

looper,

on

its

loop

taking

slrokP,

should

Llll'n be at t

l!t'

eenler

of

the

needle,

and

lhe

eye of tlw needle

should

lw about.

,',,

inch below

the

looper

point.

If

the

nrcdle

bar

is

notal

tlw

l'OIT1TI

height,

loosPn

the

pinch

screw (K, Fig.

1:1)

and

movt•

the

lll'l'di!'

bar

upward

or

downward

as

requirPd,

lhen

securely

tighten

tbe

pinch screw

(K).

FIG.

14.

To

C:nANGE

TilE

NEV,IJLP:

BAH

SnWKIS

To

Change

the

Stroke

of

the

Needle

Bar

A

variation

in

the

amount

of needlr

bar

slrokP

can

lw

ohtainl'd

by

adjusting

the

ball

stud

(0,

Fig. 14).

To

lcngtlll'll

lllP

stroL<',

loosen

the

two

set

screws (L, Fig.

14)

in

Lhe

needle

bar

n:tnk

and

move

the

hall

stud

inwardly

or

toward

t

lw

nank.

To

slwrlcn

l

lw

stroke

of

the

needle

bar,

move

lhe

ball

stud

outwardly

or

:m:ty

frotn

the

crank,

then

securely

lighten

the

sPl.

sn\'ws

(L).

From the library of: Superior Sewing Machine & Supply LLC

II

To

Set

the

Left

Hand

Looper

Turn

the

balanee

whePI

over

from

you

until

the

ncediP

bar

i1;

in

its

luwcsl position. At

this

position,

the

looper

poinl

should

hP

about

:.\

in<"h

Lo

the

left

of !.he m•edle.

Now

turn

t

hP

balance

wheel

until

t

lw

needle

bar

has

risen

:i'l

inch from

its

lowest posi-

tion

and

Lhe

point

of thl'

looper

should

be

at

the

center

of

the

nePdk.

(Some

threads

and

materials

require

more

needle loop, in

which

cas•~

the

looper

point

can

be

set/,;

inch from tlw TH'l'dle).

Tlw

left

hand

looper

should

be se!. in

the

looper

l'arrier

by

nwans

of

the

screw (A, Fig. 16), so

thal

!.he

point

of tlw

looper

on

its

loop-laking

stroke

passPs as

dose

as

pussible

to

lhe

needle

wit

houl

striking

it.

The

point

of tlw

right

hand

looppr

or

spreader

should

pass

at

the

reeess

back

of

the

left

hand

loopPr

PYP

as

dose

as possible

without

touching

it.

A variation in

the

amount

of

the

looper

motion

can

be

obtained

by

adjusling

the

ball

stud

(Q,

Fig. 15).

To

increa.<;e

this

motion,

loosen

the

set

screw

(R,

Fig. 15) in

Lhe

looper

lever

and

move

the

ball

stud

(Q)

inwardly

or

toward

the

looper

lever.

To

decrease

the

motion,

move

the

ball

stud

outwardly

or

away

from

Lhe

looper

lever.

Afler

the

desired

moti<Jn

has

been

obtained,

securely

I·u;.

If>.

To

Ht;GIJLAH;

'JJIE

LooPER

lllonoN

tighten

the

sel

screw.

To

Set

the

Front

Feed

Dog

The

front

feed dog

should

be

set

so

that

when

it

is

raised

to

its

higlwst

point

by

the

feed

lifting

eccentric,

the

full

(kpth

of

the

L<'elh

wi

II

pro

jed

above

the

throat

plate.

This

ft·l'd dog

can

be raised

or

lowpred

after

loosening

screw

(AA, Fig.

!J).

After

making

Lhe

adjustment,

securely

tighten

this

serew.

Hi

T U

FIG. 16.

ADJUSTMENTS

ON

THE

liiACHINE

To

Adjust

the

Trimmer

The

lower

knife (B, Fig. 16)

should

always

be

fastened

in posi-

tion

when

removing

or

replacing

the

upper

knife.

The

lowPr

knife is

adjustable

to

the

right

or

left

and

its

position

governs

the

position

of

the

upper

one, also

the

width

of

bight

on

the

goods.

To

Remove

the

Lower

Knife

(B,

Fig.

16),

loosen

the

thum!J

screw

(T,

Fig.

16)

and

draw

the

knife

downwardly.

To

Replace

the

Lower

Knife,

have

the

pressn

foot

and

feed

down,

press

the

upper

knife

holder

(V, Fig. 16)

toward

the

balance

wheel,

and

push

the

lower

knife

upwardly

so

as

to

touch

the

presser

foot

without

lifting it,

then

tighten

the

thumb

scr<·w

(T,

Fig.

16).

To

Adjust

the

Trimmer

Sidewise,

loosen

the

thumb

scn•w

(E,

Fig

..

13)

and

move

the

extension

bracket

(D,

Fig. 1:n

to

the

right

or

away

from

the

upper

knife, loosen

the

screw (lJ, Fig. Hi)

and.

turn

the

thumb

screw

(S, Fig. 16)

inwardly

or

outwardly

until

the

trimmer

is in

the

desired

position,

then

seeurdy

tight

<'Tl

the

screw

(U).

Move

the

extension

bracket

(D,

Fig. 1:\)

ha<"k

toward

Lhe

upper

knife,

leaving

just

enough

dearanc<'

lwlw<·<·n

the

upper

knife

and

the

bracket

so

as

Lo

allow free movPlll<'lll

of

the

upper

knife,

then

tighten

the

thumb

serew

(!<:,

Fig.

1:1).

From the library of: Superior Sewing Machine & Supply LLC

16

To

Remove

the

Upper

Knife

(C,

Fig.

16), loosen the screw

(Z,

[•'ig.

16)

at

the end

of

the knife holder, press the knife holder

(V,

Fig. 16) toward the balance wheel

and

remove

the

knife.

When

replacing

the

Upper

Knife,

have

the

knife holder

in the lowest position

and

pressed

toward

the

balanc~

wheel,

insert the knife

and

set

it

so

that

its

cutting

edge is

just

below

the

cutting

edge

of

the lower knife,

then

tighten

the clamping

screw (Z, Fig. 16).

To

Chanre

the

Width

of

Bight

The

positions of the

trimmer

and

chaining-off finger deter-

mine

the

width

of

bight on the goods.

For

a wider bight, move the

trimmer

and

lhe

chaining-off

finger on

lhe

presser foot

to

the

right.

For

a narrower bight,

move

the

trimmer

and chaining-ofT finger

to

the

left.

If

the desired trimming margin

cannot

be secured by these

adjustments,

it

may

be obtained by removing the gib (D, Fig. 16)

and

replacing

it

at

lhe

left

of

the

upper

knife.

The

lower knife

should lhe:1 be adjusted accordingly.

To

Adjust

the

Upper

Knife

Tension

FIG.

17.

1\:NIFE

CRINIJER

Jl:l:l.i

l\1('

klll\·,·s

Ill

\I';\

;II\1';1\

s

han·

'-1''

in~

<'onl;td 11itlt

l'd<'h

olltcr;

lite

atllllltllt of pn·sstlll'

can

lw

obLtincd

,,,.

;tdjuslin~

\lw k11ik

ltoldn

guid,·.

\\'lll'n

tlw kni1·,·s

;111'

in

ron\;tcl,

till' spdl'l' lwl\\'l'<'n tlw

~ttidc

(Y.

Fi~.

IIi)

and

tlw

knilc

il-wr (\V,

Fig. IIi)

should

lw

about

,',

inch.

To

Sharpen

the

Knives

Enik

(~rin,kr

-11~\H,

is

recom-

!llCIHil'<l

fm

sh;tqwniltg

the

knives

on

:r-lacltiiH's

H\1~70,

HI

Kn

allll

S

IE

7:1.

l'

sc Kn

if<:

(

~

1inlh-r ·II

:1:1r;

[or l\Ltcltilll'

~ll~7ti.

The

usc of

Llwsc

grind•·rs

insmcs

the

correct

angle

and

shapl'

of tltc

cutting

crlge

of

both

knives.

From the library of: Superior Sewing Machine & Supply LLC

Singer 81K70 User manual

Popular Sewing Machine manuals by other brands