Unionspecial 51300 series Instruction sheet

FINEST

QUALITY

STYLES

51300KK

51300

KL

CATALOG

N0.266

®

INDUSTRIAL

SEWING

LEWIS

•

COLUMBIA

MACHINES

CLASS 51300

STREAMLINED

DOUBLE

LOCKED

STITCH

MACHINES

WITH

THREAD

UNDERTRIMMER

CHICAGO

From the library of: Superior Sewing Machine & Supply LLC

Catalog

No.

266

( S

up

p 1e m e n t t o C a t a 1o g

No

•

249

)

INSTRUCTIONS

FOR

ADJUSTING

AND

OPERATING

LIST

OF

PARTS

CLASS

51300

Streamlined

Lockstitch

Styles

51300

KK

51300

KL

First

Edition

Copyright

1970

by

Union

Special

Machine

Co.

Rights

Reserved

in

All

Countries

MACHINE COMPANY

INDUSTRIAL

SEWING

MACHINES

CHICAGO

Jp.nuary

1970

From the library of: Superior Sewing Machine & Supply LLC

,-------------

From the library of: Superior Sewing Machine & Supply LLC

IDENTIFICATION

OF

MACHINES

Each

Union

Special

machine

is

identified

by

a

Style

number

which

is

stamped

into

the

name

plate

on

the

machine.

Style

numbers

are

classified

as

standard

and

special.

Standard

Style

numbers

have

one

or

more

letters

suffixed,

but

never

contain

the

letter

"Z".

Example:

"Style

51300

KK".

SpecialStylenumberscontaintheletter"Z".

When

only

minor

changes

are

made

in

a

standard

machine.

a "z"

is

suffixed

to

the

Standard

Style

number.

Example:

"Style

51300

KKZ".

Styles

of

machines

similar

in

construction

are

grouped

under

a

class

number

which

differs

from

the

style

number,

in

that

it

contains

no

letters.

Example:

"51300".

APPLICATION

OF

CATALOG

This

catalog

is

a

supplement

to

Catalog

No.

249

and

should

be

used

in

con-

junction

therewith.

Only

those

parts

which

are

used

on

Styles

51300

KK

and

KL

but

not

used

on

Styles

51300

CC,CD

areillustratedandlistedat

the

back

of

this

book.

For

clarity.

certain51300

CC,CD

parts

are

showninphantomto

help

locatethe

51300

KK

and

KL

parts.

NOTE:

When

ordering

repair

parts

always

use

the

part

number

listed

in

the

second

column.

Opposite

the

illustration

page.

parts

are

identified

by

detail

number.

part

number.

description,

and

amount

required.

Adjusting

and

operating

instructions

for

Styles

51300

KK

and

KL

are

similar

to

those

in

Catalog

No. 249

for

Styles

51300

CC.CD

respectively.

The

only

instructions

included

in

this

catalog

are

the

ones

that

are

different

from

Styles

51300

cc,

CD

or

are

additional

instructions

that

pertain

specifically

to

Styles

51300

KK

and

KL.

The

catalog

applies

specifically

to

the

Standard

Styles

of

machines

as

listed

herein.

It

can

also

be

applied

with

discretion

to

some

Special

Styles

of

machines

in

this

class.

Reference

to

direction.

such

as

right,

left,

front.

back,

etc

.•

are

given

from

the

operator's

position

while

seated

at

the

machine.

Operating

direction

of

handwheel

is

toward

the

operator.

3

From the library of: Superior Sewing Machine & Supply LLC

Adjuttinl Instructions

Description

of

Machines

Streamlined

Flat

Bed.

Single

Needle

Medium

Duty

Machine

with

"KLIPP-

IT"

(under-

trimmer)

for

use

with

Needle

Positioner.

Enclosed

Oiling

System.

Reverse

Feed

and

Back-

Tacking

Mechanism.

Needle

Bearing

Needle

Bar

Drive,

Light

Weight

Presser

Bar

and

Light

Weight

Needle

Bar

Mechanism,

Equipped

with

Light

Weight

Handwheel,

Oil

Pan

Assembly

and

Head

Oil

Siphon

Assembly.

51300

KK

For

seaming

and

hemming

dresses,

skirts.

shirts,

towels,

sheets.

curtains

and

similar

operations

on

light

to

medium

weight

woven

material

where

controlled

back

tacking

is

required.

51300

KL

For

seaming

pants,

dresses,

skirts;

for

hemming

shirts,

towels,

curtains

and

similar

operations

on

medium

weight

woven

materials

where

controlled

back-tacking

is

required.

NEEDLE

LEVER

STUD

Check

the

location

of

the

needle

lever

stud

with

respect

to

the

oil

groove.

The

head

of

the

needle

lever

stud

is

marked

with

an

arrow

and

the

word

11

up

11

•

These

studs

are

set

correctly

when

the

arrow

points

vertically

up.

Also,

check

the

position

of

the

oil

tube

inside

the

arm

casting

which

lubricates

the

needle

lever

stud.

Make

sure

that

it

is

tilted

downwards

and

that

its

delivery

end

contacts

the

wall

of

the

bed

casting

just

above

the

notch

in

the

needle

lever

thrust

collar.

Do

not

allow

the

oil

tube

to

rest

on

the

needle

lever.

LUBRICATION

Clean

the

machine

thoroughly.

Fill

oiling

system

to

first

red

line

of

the

oil

sight

gauge

in

front

of

the

machine

and

oil

all

bearings.

Run

machine

slowly

for

a

minute

to

allow

the

oil

wicks

to

carry

the

oil

to

the

bearings.

Then,

repeat

the

oiling

and

run

the

machine

at

higher

speed.

Inspect

oiling

system

for

leaks.

Wipe

up

surplus

oil,

particularly

around

the

take-up.

Oiling

diagram

No.

PL616

is

available.

CAUTION!

Oil

has

been

drained

from

the

main

reservoir

before

shipment,

so

the

reservoir

must

be

filled

to

the

proper

level

as

indicated

on

oil

gauge

before

beginning

to

operate.

RECOMMENDED

OIL

Use

a

straight

mineral

oil

of

a

Saybolt

viscosity

of

200

to

250

seconds

at

100°

Fahrenheit

in

the

main

reservoir.

This

is

equivalent

to

Union

Special

specification

No.

83.

Fill

main

oil

reservoir

at

opening

in

upper

crank

chamber

cover

and

check

oil

level

at

gauge.

Oil

is

at

maximum

level

between

two

red

lines

on

sight

gauge

on

front

of

machine.

CAUTION!

It

is

important

that

these

machines

not

be

over

filled.

It

is

recommended

that

a

new

machine,

or

one

that

has

been

out

of

service

for

an

extended

period

be

lubricated

as

follows:

Remove

the

head

cover,

clean

out

lint

and

directly

oil

the

needle

bar

link

and

the

needle

bar.

Oil

bearings,

looper

rocker,

eccentrics

and

all

other

parts

that

have

oil

wicks

touch-

ing

them.

Replace

head

cover

as

no

further

hand

oiling

will

be

required.

Run

machine

slowly

for

several

minutes

to

distribute

oil

to

the

various

parts.

Oil

may

be

drained

from

main

reservoir

by

removing

plug

screw

located

below

the

handwheel

in

the

main

frame.

4

From the library of: Superior Sewing Machine & Supply LLC

Adjuadn1Inetructions

THREADING

AND

OILING

DIAGRAM

FOR

CLASS

51300

MACHINES

WITH

"KLIPP-

IT"

Thread

machine

as

indicated.

The

looper

threading

has

been

enlarged

for

clarity.

Oil

has

been

drained

from

the

machine

before

shipping,

and

the

reservoir

must

be

filled

before

beginning

to

operate.

Oil

is

filled

at

spring

cap

(A)

in

top

cover.

Oil

level

is

checked

at

sight

gauge

(B);

maintain

oil

level

between

lines

on

gauge.

Use

a

straight

mineral

oil

with

a

Saybolt

viscosity

of

200

to

250

seconds

at

100°

Fahrenheit.

Excessive

oil

in

the

main

reservoirmay

be

drained

byremoving

plug

screw

located

directly

helow

the

handwheel.

5

From the library of: Superior Sewing Machine & Supply LLC

Adjuatin1 Instructions

NEEDLE

Put

in

a

new

'

needle

of

proper

type

and

size.

For

Style

51300

KK

Type

130

GHS-036

and

for

Style

51300

KL

Type

130

GHS-040

Place

throat

plate

support

and

throat

plate

on

the

bed

to

check

that

the

needle

enters

the

throat

plate

slot

in

the

middle.

Then,

remove

these

parts

for

adjusting

the

looper

and

mounting

of

gauge

for

setting

the

feed

mechanism.

ADJUSTMENT

OF

THE

FEED

MECHANISM

BY

A

GAUGE

H J K

F

E

G

Q c

L D G21227 L

__

.,.,

AB

I

----'

_,.,.,

p

Fig. 1

--

N

M

The

feed

mechanism

is

set

in

the

assembly

department

by

using

gauge

G21227

L.

To

adjust

rocker

"G"

loosen

nut

(A.

Fig.

1)

(CAUTION!

NUT

HAS

LEFT

THREAD).

Place

the

feed

crank

stud

(B)

in

the

main

shaft

slot

(D)

and

regulate

screw

(C)

so

that

the

(E)

of

the

gauge

fits

into

the

hole

(F)

of

the

feed

rocker

shaft.

when

the

upper

part

of

the

segment

of

the

rocker

(G)

is

in

its

end

position

to

the

needle

.

Tighten

nut

(A).

Loosen

screw

(H).

place

distance

gauge

(V)

in

the

segment

of

the

rocker

(G)

and

press

the

sliding

block

against

the

distance

gauge

(V).

Move

lever

(J)

until

the

head

of

screw

(K)

contacts

the

stop

(L)

of

the

gauge.

Tighten

screw

(H).

Then

set

stop

ring

(M)

against

lever

(N).

For

the

adjustment

of

reverse

feed

place

distance

gauge

(R)

in

the

segment

of

the

rocker

(G).

Move

the

sliding

block

with

the

knee

press

against

the

distance

gauge

(R)

and

set

the

stop

ring

(P)

against

the

lever

(N).

6

From the library of: Superior Sewing Machine & Supply LLC

AdJutrinl Instructions

ADJUSTMENT

OF

THE

FEED

MECHANISM

BY

A

GAUGE

(Continued)

After

this

adjustment

the

stitch

length

should

be

about

8 1I2

stitches

per

inch

in

both

directions.

For

correction

reset

stop

ring

(M).

CAUTION!

BE

SURE

THAT

THERE

IS

1132

INCH

SPACE

BETWEEN

THE

SEGMENT

(G)

AND

THE

BED

AT

THE

LARGEST

STITCH

LENGTH

(Q,

Fig.

1).

If

a

larger

stitch

length

than

8 1I2

stitches

per

inch

is

needed,

re-adjust

stop

ring

(M)

downwards.

All

other

stitch

length

changes

must

be

made

by

the

stitch

regulating

screw

(C)

after

loosening

the

nut

(A)

of

the

feed

crank

stud

(B).

ADJUSTMENT

OF

THE

FEED

MECHANISM

WITHOUT

GAUGE

H J

G

_,

......

I

--.&

......

-

s

Fig,2

·--

First

adjust

the

feed

rocker

segment

(G)

to

the

largest

movement

by

the

regulating

screw

(C)

after

loosening

nut

(A,

Fig.

2).

(CAUTION!

NUT

HAS

LEFT

THREAD).

The

distance

from

the

main

shaft

head

(D)

to

the

head

of

the

feed

crank

stud

(B)

should

be

9l32inch

(Fig.

3).

As

the

movement

of

the

feed

rocker

segment

is

limited

by

the

bed,

make

sure

that

the

fre.e

space

(Q)

is

not

less

than

1I32

inch

(Fig.

2).

For

adjusting

the

sliding

block

turn

handwheel

until

the

top

part

of

the

segment

(G)

is

in

its

end

position

to

the

needle.

Loosen

screw

(H),

place

a

of

114

inch

dia.

(e.

g.

a

drill

of

114

11

dia.)

between

the

sliding

block

and

the

upper

end

of

the

segment.

When

the

sliding

block

is

pressed

against

this

pin,

set

the

lever

(J)

so,

that

the

distance

between

the

head

screw

(K)

and

the

shaft

(S)

is

4

118

inches.

Tighten

screw

(H)

and

set

the

stop

ring

(M)

against

lever

(N).

For

adjusting

the

reverse

feed

place

a

of

5I

16

inch

dia.

in

the

lower

part

of

the

segment

(G).

Move

the

sliding

blockwith

the

kneepress

against

the

of

5116

inch

dia.

and

set

the

stop

ring

(P)

against

the

lever

(N).

7

From the library of: Superior Sewing Machine & Supply LLC

AcUuttintE

Instructions

ADJUSTMENT

OF

THE

FEED

MECHANISM

WITHOUT

GAUGE

(Continued)

After

this

adjustment

the

stitch

length

should

be

about

8

1/2

stitches

per

inch

in

both

directions.

For

correction

reset

stop

ring

(M).

If

a

larger

stitch

length

than

8

1/2

stitches

per

inch

is

needed.

re-adjust

stop

ring

(M)

downwards.

All

other

stitch

length

changes

must

be

made

by

the

stitch

regulating

screw

(C)

after

loosening

the

nut

(A)

of

the

feed

crank

stud

(B).

LOOPER

ADJUSTMENT

Insert

the

looper

in

the

looper

rocker.

Notice

that

the

screw

rests

on

the

looper

flat.

The

looper

gauge

represents

the

measurement

from

the

centerline

of

the

needle

to

the

point

of

the

looper

when

the

looper

is

at

the

right

end

of

the

stroke.

This

measure-

ment

should

be

5/32

inch.

Looper

gauge

No.

21225-5/32

can

be

used

advantageously

in

making

this

adjustment.

For

the

looper

gauge

adjustment

loosen

the

two

nuts

on

the

looper

connecting

rod.

After

the

right

gauge

is

set.

tighten

the

nuts

securely.

Notice

that

the

connecting

rod

ball

joints

have

clearance

in

all

positions.

LOOPER

AVOID

MOTION

When

the

looper

moves

to

the

left.

its

point

should

pass

the

rear

of

the

needle

as

close

as

possible

without

contacting.

SYNCHRONIZING

LOOPER

AND

NEEDLE

MOTIONS

Use

gauge

No.

21227

R.

Insert

the

pin.

which

is

included

with

the

gauge.

in

the

looper

rocker.

Place

the

gauge

plate

on

the

throat

plate

seat

using

the

throat

plate

screws

for

attaching.

Place

the

indicator

portion

of

the

gauge

in

the

needle

thread

take-

up

wire

holder

with

the

pointer

to

the

right.

Do

not

tighten

the

set

screw

at

this

time.

Turn

handwheel

in

operating

direction

until

the

in

the

looper

rocker

contacts

the

edge

of

the

gauge

plate

and

set

the

indicator

so

that

the

left

end

of

the

pointer

rests

against

the

top

of

the

needle

bar

and

the

right

end

of

the

pointer

rests

at

"O".

Tighten

set

screw

and

note

indicator

reading.

Turn

the

handwheel

in

the

reverse

direction

until

the

again

contacts

the

plate.

If

motions

are

in

synchronization

the

pointer

on

the

indicator

will

return

to

the

same

reading.

A

variation

of

one

graduation

on

the

scale

is

allowable.

If

the

reading

is

higher

on

the

scale

when

the

handwheel

is

turned

in

operating

direction.

the

looper

drive

lever

rocker

will

have

to

be

moved

to

the

rear.

If

the

reading

is

lower.

this

rocker

will

have

to

be

moved

to

the

front.

Remove

the

oil

reservoir

top

cover

and

drain

the

reservoir.

Loosen

the

screws

in

the

looper

drive

eccentric

mechanism

and

move

the

eccentric

as

far

to

the

right

as

it

will

go.

Then

drive

the

rear

bushing

to

the

front

or

the

middle

bushing

to

the

rear.

To

avoid

distorting

the

parts

remove

the

plug

screw

in

the

rear

bushing

before

driving

to

the

front

and

place

a

horse

shoe

shape

metal

washer

approximately

1/16

inch

thick

between

the

looper

drive

lever

and

the

adjacent

bushing

when

driving

the

bushing

to

the

rear.

Retighten

all

screws

and

seal

the

reservoir

cover

in

position

with

Permatex

Gasket

Cement

to

prevent

oil

leakage.

A

convenient

1/2

pint

can.

including

brush.

is

identified

by

the

symbol

"CE5C".

and

will

be

promptly

furnished

by

Union

Special.

Automobile

supply

shops

carry

it.

If

the

gauge

is

not

available.

synchronization

may

be

checked

as

follows:

Insert

the

looper

in

the

looper

rocker

and

turn

the

pulley

in

the

operating

direction

B

From the library of: Superior Sewing Machine & Supply LLC

Aclluatinllnatructiona

SYNCHRONIZING

LOOPER

AND

NEEDLE

MOTIONS

(Continued)

until

the

looper

point

moves

to

the

left

and

is

even

with

the

needle.

Note

the

height

of

the

eye

of

the

needle

with

respect

to

the

looper

point,

then

turn

the

pulley

in

the

reverse

direction

until

the

looper

point

again

moves

to

the

left

and

is

even

with

the

needle.

If

the

motions

synchronize,

the

height

of

the

eye

of

the

needle

with

respect

to

the

looper

point

will

be

the

same.

A

variation

of.

005

inch

is

allowable.

If

the

distance

from

the

eye

of

the

needle

to

the

point

of

the

looper

is

longest

when

the

pulley

is

turned

in

operating

direction,

move

the

looper

drive

lever

rocker

to

the

rear.

Moving

it

in

the

opposite

direction

acts

the

reverse.

NEEDLE

BAR

Set

the

needle

bar

so

that

the

top

of

the

needle

eye

is

less

than

1/64

inch

below

the

looper,

when

point

of

looper

moving

to

the

left

is

even

with

left

side

of

the

needle

.

When

tacking,

skip

stitches

may

occur

if

the

needle

is

set

too

low.

RETAINING

FINGER

DRIVE

Adjust

the

retaining

arm

in

or

out

of

its

slot

so

that

the

hook

point

at

its

furthest

travel

to

the

left

is

1/8

inch

from

center

line

of

needle.

Set

the

pivot

bracket

back

or

forth

in

its

adjustment

so

that

the

hook

point,

when

passing

the

back

of

the

needle,

has

1/32

inch

clearance

back

of

the

needle.

No

part

of

the

hook

should

ever

contact

the

needle.

TIMING

THE

RETAINER

To

time

the

retainer

drive

remove

access

plug

screw

in

casting

just

to

the

right

of

the

looper

drive

lever,

insert

screw

driver

and

loosen

screws

in

the

driven

gear

on

the

vertical

shaft.

Set

the

needle

bar

at

the

bottom

of

the

stroke

and

turn

the

vertical

crank

shaft

by

hand

(gripping

the

crank

strap)

until

the

timing

mark

on

the

face

of

the

vertical

crank

check

lines

up

with

the

timing

mark

on

the

top

cover.

If

the

retainer

gear

drive

is

located

properly

and

if

it

becomes

necessary

to

remove

the

oil

chamber

top

cover,

the

entire

retainer

drive

will

lift

off

with

the

top

cover

except

the

main

shaft

gear.

When

the

cover

is

to

be

replaced,

the

machine

should

first

be

turned

over

so

that

the

needle

is

at

the

bottom

of

its

stroke,

and

the

retainer

drive

should

be

positioned

so

the

timing

rnarks

are

in

line.

The

top

cover

with

the

retainer

drive

set

as

above

can

then

be

put

in

place

being

careful

that,

when

the

main

shaft

drive

gear

and

the

driven

gear

mesh

together

the

crank

shaft

does

not

turn.

If

the

crank

shaft

does

not

turn,

the

cover

screws

can

be

inserted

and

tightened

and

the

retainer

timing

will

be

correct.

Check

the

timing

to

be

sure

.

it

is

correct.

FRONT

NEEDLE

GUARD

Set

the

front

needle

guard

high

enough

so

that

its

top

surface

is

as

high

or

slightly

higher

than

the

looper

point,

and

so

that

the

guarding

surface

just

contacts

the

needle

as

the

looper

point

comes

up

to

the

needle.

Needle

breakage

will

occur

when

back-

tacking

if

the

front

guard

is

not

as

high

as

possible

and

the

rear

guard

as

low

as

possible.

See

paragraph

for

setting

rear

needle

guard.

9

From the library of: Superior Sewing Machine & Supply LLC

AdJUJrinl

Instruction~

FEED

DOG

ADJUSTMENT

Set

the

feed

dog

so

that

the

tips

of

the

teeth

are

parallel

with

and

3I

64

inch

above

the

throat

plate

at

highest

point

of

travel.

Adjust

the

supporting

screw,

under

the

feed

dog,

to

maintain

this

setting.

Check

clearance

between

top

of

retainer

hook

and

bottom

of

feed

dog

at

closest

approach.

REAR

NEEDLE

GUARD

The

needle

must

barely

contact

the

needle

guard

when

the

point

of

the

looper

-

moving

to

the

left

-

is

.

005

inch

before

the

right

edge

of

the

needle.

THREADING

THE

MACHINE

Thread

the

machine

according

to

threading

diagram

No.

PL616

and

start

sewing

tests.

LOOPER

THREAD

TAKE-UP

The

looper

thread

take-up

must

be

placed

on

the

main

shaft

so

that

both

discs

have

equal

clearance

on

each

side

of

the

shield.

The

looper

thread

take-

up

is

not

spotted

on

the

main

shaft

and

consequently

can

be

set

to

compensate

for

varying

conditions

•

When

the

needle

moves

down

and

the

looper

starts

its

movement

from

left

to

right

the

discs

must

come

out

of

the

cast-

off

plate

to

take

the

slack

from

the

looper

thread

.

The

looper

thread

must

cast

off

from

the

highest

lob

of

the

take-

up

when

the

point

of

the

needle

has

entered

the

triangle

deep

enough.

The

retaining

finger

controls

the

amount

of

slack

thread

in

the

system

and

must

be

set

on

the

cast-

off

plate

so

that

it

has

clearance

between

the

two

discs

of

the

take-up

and

so

that

it

releases

the

looper

thread

just

after

the

eye

of

the

needle

comes

up

out

of

the

material.

THREAD

TENSION

The

looper

thread

tension

should

be

about

1I4

of

the

needle

thread

tension.

If

the

tension

is

too

low,

the

take-

up

may

lose

control

over

the

thread

causing

triangle

skips.

If

the

tension

is

too

high

the

stitch

may

be

pulled

down.

NEEDLE

THREAD

NIPPER

It

may

not

be

necessary

to

use

the

needle

thread

nipper

in

front

of

the

casting

just

above

the

needle

if

light

thread,

under

60-

2

cord,

is

used.

If

heavy

thread

is

used,

50-

2

cord

or

heavier,

the

nipper

spring

helps

to

throw

a

needle

loop

when

reverse

feeding.

PRESSER

FOOT

See

that

the

presser

foot

hinges

freely

and

that

its

under

surface

is

in

lateral

align-

ment

with

the

feed

dog

and

the

throat

plate.

PRESSER

FOOT

PRESSURE

The

presser

spring

adjusting

screw

is

the

knurled

screw

directly

behind

the

needle

bar.

Turning

it

clockwise

increases

the

pressure,

counterclockwise

acts

the

reverse.

Set

the

pressure

only

high

enough

to

feed

properly.

10

From the library of: Superior Sewing Machine & Supply LLC

Adj111tiq lnatructiona

NEEDLE

THREAD

TAKE-UP

WIRE

Set

the

needle

thread

take-

up

wire

(strike-

off)

located

to

the

right

of

the

needle

bar

,

as

low

as

possible.

Raise

it

only

if

needle

loop

skips

occur

and

cannot

be

corrected

any

other

way.

NEEDLE

THREAD

FRAME

EYELET

Set

the

needle

thread

frame

eyelet

(No.

539)

located

to

the

left

of

the

needle

lever

stud-

in

the

middle

of

its

slot.

Raising

it

brings

better

needle

thread

pull

up.

Lowering

is

necessary

if

thread

breakage

occurs,

at

cross

seams.

The

position

of

the

thread

frame

eyelet

influences

the

size

of

the

needle

thread

loop.

Raising

causes

a

larger,

lowering

a

smaller

needle

thread

loop.

SEAM

CONTROL

Check

the

seam

produced

for

chafed

or

cut

threads

by

unravelling

the

stitch.

Apply

a

triangular

oil

stone

for

polishing

the

middle

row

of

the

feed

dog

teeth

which

may

be

too

sharp.

Check

that

the

machine

chains

off

well

without

chafing

the

chain.

Chaining

will

be

worse

if

the

teeth

are

too

highly

polished.

ADJUSTING

"KLIPP-IT"

MECHANISM

With

all

of

the

electrical

plug-connections

disconnected,

adjustments

should

be

made

in

the

following

sequence:

ADJUSTMENT

OF

CUTTING

SOLENOID

STROKE

I

1

I

(

B

c

The

length

of

stroke

of

the

arma-

ture

shaft

(A,

Fig.

4)

should

be

approximately

45I64

inch

(See

Fig.

4) .

Since

the

armature

of

the

solenoid

is

designed

to

operate

in

one

direction

only,

when

actuated,

its

only

means

of

returning

to

its

rest

position

is

by

the

spring

loaded

shaft

(B).

Loosen

nut

(C),

move

head

(D)

to

the

right

or

left

on

shaft

(B)

to

obtain

desired

dimension,

retighten

nut

(C).

ADJUSTING

LOOPER

HEIGHT

The

looper

height

should

be

set

5I3

~

inch

below

the

surface

of

the

throat

plate

support

(A,

Fig.

5)

when

at

its

extreme

left

position(See

Fig.

5).

ADJUSTING

SEVERING

DEVICE

Fig.

4

With

theneedle

indown-position,

slowly

depress

the

cutting

solenoid

armature

shaft

(A,

Fig.

4)

observing

that

the

lower

knife

(A,

Fig.

6)

must

pass

to

the

rear

of

th

·e

needle

(B)

as

close

as

possible

without

contacting.

Should

adjustment

be

required.

loosen

screws

(C),

reposition

knife

and

retighten

screws.

With

the

lower

11

From the library of: Superior Sewing Machine & Supply LLC

AdJUJtiaa

lrutructioru

ADJUSTING

SEVERING

DEVICE

(Continued)

. N

knife

at

its

extreme

left

position,

the

cutting

~I

edge

(D)

for

the

needle

thread

must

be

1/8

A---..~c.-----..,.

----

-

·

~

inch

to

the

left

of

the

center

of

the

needle

(See

---

T

Fig.

6).

Should

adjustment

be

required,

loosen

locknut

(E)

remove

snap

ring

(F)

and

rotate

connecting

rod

(G)

as

necessary

to

obtain

required

dimensions.

Replace

snap

ring

and

retighten

locknut.

With

the

needle

in

up-position

and

the

lower

knife

swung-in,

there

should

be

approxi-

mately

•

012

inch

clearance

between

the

lower

knife

(A,

Fig.

7),

looper

retainer

(B)

and

looper

(C).

If

adjustment

is

necessary,

CAREFULLY

BEND

the

knife

carrier

bracket

at

points

(H,

Fig.

6)

to

suit.

H

Fig.

6

ADJUSTING

KNIVES

Fig.

5

F

r-·-·

te

·""

To

avoid

pinching

the

needle

thread

when

the

lower

knife

(A,

Fig.

8)

swings

out,

the

edge

of

the

lower

knife

and

the

cut-out

on

the

looper

thread

retaining

plate

spring

(B)

must

be

in

alignment

as

shown

at

point

(C).

To

obtain

this

adjustment

loosen

screws

(D),

move

the

upper

knife

(E)

and

plate

spring

(B)

as

required,

retighten

screws

(D) -

12

From the library of: Superior Sewing Machine & Supply LLC

Ac:IJUitinainatructiona

A

Fig.

7

ADJUSTING

KNIVES

(Continued)

A B

Fig.

8

With

both

knives

in

their

resting

position,

the

upper

knife

(A,

Fig.

9)

must

over-

lap

the

lower

knife

(B)

approximately

.

020

inch.

Adjustment

can

be

made

by

loosen-

•

C)

....

C)

I

()

~*=t

=~~:::;:.._

__

,

Fig.

9

Fig.

9A

ing

screw

(C)

and

rotating

the

hexagonal

stop

plate

(D) .

Retighten

screw.

With

the

needle

in

up-position

and

the

lower

knife

swung-in,

a

clearance

of

.

020

- .

040

inch

must

be

maintained

between

the

upper

knife

(A,

Fig.

9A)

and

loop

retainer

(E).

Adjustment

can

be

made

by

loosen-

ing

screws

(F,

Fig.

9)

and

moving

stop

(G)

forward

or

rearward.

Care

must

be

taken

to

also

maintain

.

020

-

.

040

inch

clearance

between

stop

(G)

and

the

correspond-

ing

edge

of

the

upper

knife

carrier

(H),

with

the

cutting

solenoid

in

its

resting

position.

Retighten

screws

(F).

The

looper

thread

(A,

Fig.

10)

must

be

clamped

between

the

plate

spring

(B)

and

lower

knife

(C)

after

being

severed

Fig.

10

by

the

upper

knife

(D).

Tension

on

the

looper

thread

retaining

plate

spring

can

be

adjusted

by

turning

the

tension

regulating

screw

(F,

Fig.

8).

13

From the library of: Superior Sewing Machine & Supply LLC

F

AdjUitinglnatructiona

THREAD

PULL-

OFF

HOOKS

AND

TENSION

RELEASE

ADJUSTMENTS

Fig.

11

Fie:.

12

Loosen

clamp

screw

(A,

Fig.

11)

in

clamp

(B)

located

at

the

rear

ofthe

machine

and

set

lever

(C)

in

a

horizontal

position,

retighten

clamp

screw.

Adjust

the

tension

disc

separator

(D)

by

turning

eccentric

(E)

so

that

the

tension

is

released

as

soon

as

the

cutting

process

begins.

Adjust

thread

pull-

off

hook

(F)

so

that

the

needle

thread

is

long

enough

to

start

sewing

immediately

on

the

A

needle

thread

tail

of

1/16"

-

1/8"

on

top

of

the

material

is

permissible.

Adjust

thread

pull-

off

hook

(G)

so

that

the

looper

thread

is

clamped

securely

after

it

has

been

severed.

CAUTION:

Observeto

insure

ample

clear-

ance

of

the

pull-off

hooks

during

the

cutting

operation.

ADJUSTING

THREAD

WIPER

With

the

power

lead

removed

from

the

thread

wiper

solenoid,

sew

on

a

piece

of

fabric

and

sever

threads.

Actuate

the

thread

wiper

(A,

Fig.

12)

by

hand,

observing

that

the

needle

thread

must

be

deflected

by

the

hook

of

the

wiper

coming

in

(See

Fig.

12),

and

is

caught

by

the

hook

of

the

wiper

when

returning

(See

Fig.

13).

The

wiper

must

not

contact

the

needle

or

the

presser

foot

during

its

arc

of

travel.

This

condition

can

be

accomplished

by

loosen-

ing

screws

(A,

B,

C,

Fig

.

14),

reposition

as

required.

assuring

that

the

wiper

moves

smoothly.

Guard

plate

(D)

must

be

position-

ed

so

the

wiper

will

not

hook

into

the

fabric.

Re-

tighten

screws.

14

Fig.

13

From the library of: Superior Sewing Machine & Supply LLC

AdJUidnilnatructiona

ADJUSTING

THREAD

WIPER

(Continued)

Fig.

14

When

returning

to

rest

posi-

tion

the

thread

wiper

lever

(A,

Fig.

15)

must

be

stop-

ped

by

stop

(B)

slightly

be-

fore

the

armature

of

the

solenoid

stops.

This

can

be

accomplished

by

loosening

screw

(C),

reposition

lever

as

required,

re-

tighten

screw.

Reconnect

power

lead

for

thread

wiper

assembly.

15

Fig.

15

From the library of: Superior Sewing Machine & Supply LLC

TRIMMER

TROUBLESHOOTING

Condition

Causes

Cures

Both

threads

not

cut

Solenoid

not

working

Check

fuse,

check

solenoid

movement

by

hand

Solenoid

jammed

by

linkage

Re-adjust

tension

assembly

of

tension

assembly

linkage

for

free

movement

Improper

synchronizer

tim-

Reset

synchronizer

ing

Solenoid

plug

disconnected

Connect

plug

for

solenoid

Power

lead

to

motor

not

Connect

motor

power

lead

connected

Bent

relay

contacts

Reshape

relay

contacts

Loose

lower

knife

Tighten

lower

knife

Needle

thread

too

short

Needle

thread

pull-

off

set

Adjust

thread

strike-

off

lower

after

trimming

too

high

on

tension

assem-

for

more

needle

thread

bly

Lower

knife

trims

both

sides

Re-adjust

lower

knife

of

needle

loop

around

looper

Needle

thread

pinched

after

Not

enough

spring

tension

Adjust

spring

tension

between

trim

cycle

between

upper

and

lower

upper

and

lower

knife

Lower

knife

and

clearance

Re-adjust

knives

cut

in

looper

thread

retain-

ing

spring

not

aligned

pro-

perly

Dull

kirlfe

Replace

knives

Upper

and

lower

knives

do

Re-adjust

knives

not

overlap

enough

for

proper

shearing

Machine

does

not

start

sew-

Thread

tail

too

short,

thread

Re-adjust

pull-offs

for

suf-

ing

after

trimming

pull-

offs

set

too

high

ficient

needle

thread

and

loop-

er

thread

Looper

thread

control

cam,

Re-adjust

looper

thread

con-

and

tension

not

adjusted

trol

cam,

and

tension

properly

Looper

thread

retaining

Remove

lint

from

between

spring

does

not

retain

looper

knives

and

re-adjust

knives

thread

Needle

thread

cut

but

looper

Lower

knife

does

not

move

Re-adjust

knife

assembly

and

th~ead

not

caught

far

enough

to

the

left

connecting

rod

(see

adjusting

instructions)

Lower

knife

not

properly

Adjust

lower

knife

adjusted

Too

much

needle

thread

on

Needle

thread

pull-

off

set

Raise

needle

thread

pull-off

top

side

of

garment

when

too

low

starting

to

sew

16

From the library of: Superior Sewing Machine & Supply LLC

INSTRUCTIONS

FOR

QUICK

NEEDLE

POSITIONER

17

From the library of: Superior Sewing Machine & Supply LLC

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From the library of: Superior Sewing Machine & Supply LLC

UnionSpecial 51300 Series Instruction sheet

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