Unionspecial Lf600 series Setup guide

Adjusting instructions and

illustrated parts list

Two-

and

three-needle,

LF600

"Standard

Class"

differential

feed,

flatbed

coverstitch

machines.

From the library of: Superior Sewing Machine & Supply LLC

FOREWORD

This technical

manual

has

been

prepared to guide

you

in

the maintenance

of

your

new

UNION

SPECIAL

machine.

Careful

attention

to

the

instructions

for

operating

and

adjusting

these

machines

will

enable

you

to

maintain

the

superior

perfonnance

and

reliability

designed

and

built

into

every

UNION

SPECIAL

machine.

The

Adjusting

Instruction

portion

of

this

manual

explains

in

detail

the

proper

setting

for

each

of

the

components

forming

the

s~itch

and

completing

the

functions

of

the

machine.

Figures

are

used

to

illustrate

the

adjustments

using

reference

letters

to

point

out

specific

items discussed.

Adjustments

are

presented

in

sequence so

that

a

logical

progression

is

accomplished.

Some

adjustments

performed

out

of

sequence

may

have an

adverse

effect

on

the

function

of

other

Implementation

of

Preventive

Maintenance Schedule

can

bring

about

significant

improvements

in

operator

productivity

by

avoiding

costly

equipment breakdowns.

Whenever

it

becomes

necessary

to

make

repairs

or

replace

parts

on

your

machine~

be

sure

to

insist

on

genuine

UNION

SPECIAL

Repair

Parts.

These

parts

are

designed

specifically

for

your

machine and

manufactured

with

utmost

precision

to

assure

long

lasting

service.

This

Ca

ta

1

og

has been

made

on

the

basis

of

avai1ab1e

information.

Changes

in

design

and/

or

improvements

may

incorporate

a s1i

ght

modi

fi

cation

of

configuration

in

illustrations

or

part

numbers.

Reprinted

B/1192

CATALOG

NO.

143R

For

Styles

LF632K200MV

LF633K200MM

LF633K200MN

LF633K200MW

First

Edition

Copyright

1987

By

Union

Special

Corporation

Rights

Reserved In All

Countries

Printed

in U.S.A.

2

From the library of: Superior Sewing Machine & Supply LLC

Each

UNION

SPECIAL

machine

is

identified

by

a

Style

number, which

on

this

machine

Class,

is

stamped

into

the

Style

plate

affixed

to

the

right

front

of

the

machine.

The

serial

number

is

stamped

into

the

bed

casting

at

the

left

rear

base

of

the

machine.

NOTE:

Instructions

stating

direction

or

location.

such

as

right,

left,

front,

or

rear

of

machine,

are

given

relative

to

the

operator's

position

at

the

machine,

unless

otherwise

noted.

The

handwheel

rotates

counterclockwise

in

operating

direction,

as

viewed from

the

right

end

of

the

machine.

STYLES

OF

MACHINES

High

speed,

maximum

performance,

medium

sewing

capacity,

two

or

three

needle,

one

looper,

spreader,

differential

feed

flat

bed machines.

Totally

enclosed

feed and

looper

drive

mechanism,

fully

automatic

forced

feed

lubricating

system

with

easily

replaceable

oil

filter,

thumbscrew

adjustable

main

and

differential

feeds,

independently

driven

rear

needle

guard

and

quick

adjustable

looper

avoid.

LF632K200MV

Two

needle, four thread,

offset

differential

feed

machine

for

attaching

cellarettes

to

knitted

undergarments, long

length

rib

knit

strip

cut

perpendicular

to

the

wale

or

parallel

with

the

wale.

Stitch

type

602.

Standard

gauge

Nos.

8

and

12.

Speeds

up

to

6000

R.P.M.

Stitch

range 9

to

16

S.P.l.

LF633K200MM

Three

needle,

five

thread,

offset

differential

feed machine

for

attaching

cuffs

and

crotch

seaming

operation

to

knit

garments.

Stitch

type 605. Standard

gauge

No.

16.

Speeds

up

to

6000

R.P.M.

Stitch

range 9 to

16

S.P.l.

LF633K200MN

Same

as Style

LF633K200MM

except

fitted

with

tandem

differential

feed.

LF633K200MW

Same

as Style

LF633K200MM

except

fitted

with

parts

for

using a folder

to

attach

split

tube

borders

to

knitted

undergarments.

Stitch

range

9 to

12

S.P.l.

3

From the library of: Superior Sewing Machine & Supply LLC

SAFETY

RULES

CAUTION!

THIS

SYMBOL

INDICATES

YOUR

PERSONAL

SAFETY

IS

INVOLVED

TO

PREVENT

PERSONAL

INJURY:

-All

power

sources

to

the

machine

MUST

be

TURNED

OFF

before

threading,

oiling,

adjusting.

or

replacing

parts.

Wear

safety

glasses.

All

shields

and

guards

MUST

be

in position before operating machine.

DO

NOT

tamper with

safety

shields,

guards,

etc.,

while

machine

is

in operation.

LUBRICATION

IMPORTANT:

Machine

must

be

in a leveled

position.

Oil has been

drained

from main

reservoir

before

shipment.

Use

a

straight

mineral

oil

with

a Saybolt

viscosity

of

90

to

125

seconds

at

100

degrees

Fahrenheit.

This

is

equivalent

to

UNION

SPECIAL

Specification

No.

175.

Remove

oil

filler

cap (A,

Fig.

I)

and

fill

to

the

TOP

line

of

oil

level

gauge (B). Replace

oil

filler

cap.

CAUTION!

On

new

machines,

machines

that

have been

out

of

service

for

an

extended

period

of

time

OR

machines

that

have been

drained

of

oil

and

refilled

•...

RUN

MACHINE

SLOWLY

at

300

R.P.M.

for

approximately

five

minutes

while

paying

strict

attention

to

the

oil

flow

indicator

which

should

rise

in

the

oil

filler

cap

(A)

and remain

steady

while

machine

is

running.

This

must

be

noted

to

ensure

that

oil

flow

indicator

is

functioning

and

oil

is

circulating.

Check

oil

level

while

machine

is

running

which

MUST

be

maintained

between

the

red

lines

of

oil

level

gauge.

To

maintain

maximum

recommended speed and

serviceability

of

these

machines,

refer

to

General

Preventive

Maintenance

Schedule.

Under

no

circumstances,

should

oil

remain

in

the

machine

for

more

than

one

year.

Oil

drain

plug

is

located

in

bottom

of

oil

pan.

ALWAYS

change

oil

filter

when

oil

is

changed.

At

this

time,

evaluate

the

contaminated

condition

of

the

oil

to

determine

if

the

oil

filter

should

be

changed more

or

less

frequently.

To

replace

filter,

remove

four

screws (C,

Fig.

1)

and

cover

(0);

lift

out

filter

cartridge.

REMOVE

(brass)

BY-PASS

VALVE

FROM

TOP

OF

OLD

FILTER

AND

INSTALL

IN

NEW

FILTER.

Reassemble in

reverse

manner.

4

From the library of: Superior Sewing Machine & Supply LLC

l'l<.lt/1

LUBRICATION

DIAGRAM

I~

•

PRESSURE

OIL

L'·IINLET

/-

•

D

Fig. I

5

SIPHON

RETURN

FIL

TEA

BY-PASS

I

From the library of: Superior Sewing Machine & Supply LLC

PIVOT

GUARD

TO

LEFT

FOR

THREAD

I

A

111A

I

'

THREADING

DIAGRAM

6

From the library of: Superior Sewing Machine & Supply LLC

NEEDLES

Each

needle

has

both a

type

and

size

number.

Type

number

denotes the

kind

of

shank,

point,

length,

groove,

finish,

and

other

details.

Size

number, stamped on

the

needle

shank

in

metric,

denotes

largest

diameter

of

blade,

measured midway

between shank and eye.

Collectively,

type and

size

number

represent

the

complete

symbol,

which

is

given

on

the label of all needles

packaged

and

sold

by

UNION

SPECIAL

CORPORATION.

Standard

recommended

needle

for

machines

covered

is

Type 128

GBS,

Size

75/029.

Below

is

the

description

and

sizes

available:

NEEDLE

TYPE

128

GBS

DESCRIPTION

Round

shank, round

point,

short,

double groove, struck groove, ball

eye,

spotted,

ball

point,

chromium

plated.

SIZE

AVAILABLE

65/025, 70/027,

75/029, 80/032,

90!036, 100/040.

To

have

needle

orders

promptly

and

accurately

filled,

an empty

package,

a sample

needle.

or

the

type

and

size

number

should

be

forwarded.

Use

description

on

label.

A

complete

order

would

read

11

1000

needles,

Type 128

GBS,

Size

75/029".

The

following

instructions

explain

in

detail

the

proper

setting

for

each

of

the

components

forming

the

stitch

and

completing

the

functions

of

the

machine.

Adjustments

are

presented

in

sequence

so

accomplished.

Some

adjustments

performed

out

effect

on

the

function

of

other

THREAD

MACHINE

AS

ILLUSTRATED.

7

that

a logical

of

sequence

may

progression

is

have an

adverse

From the library of: Superior Sewing Machine & Supply LLC

Fig.

2

Fig.

3

Fig. 4

TIMING

FEED

TO

NEEDLE

Adjustment

would be

required

if

the

machine

is

feeding while

the

needles

are

in the

work.

This

can

be

accomp

1i shed

by

removing

top

cover,

head

cover,

left

cloth

plate,

and

top feed chamber cover. Rotate

handwheel

in

operating direction to position needle bar

at

bottom

of

stroke.

At

this

time,

the

first

screws

(A,

Fig. 2)

in

the

feed

drive

eccentrics

(B) must be

on

the

flat

of

the

feed

drive

shaft

and

in

a

vertical

position.

Adjustment

can

be

made

by loosening

two

screws (A,

Fig.

3)

in upper mainshaft

sprocket

(B).

Hold

the

handwheel

firmly

with

needle

bar

at

bottom

of

stroke

and

rotate

pulley

as required

to

position

screws

(A,

Fig. 2)

so

they

are

vertical.

Tighten screws

(A,

Fig. 3)

securely.

SYNCHRONIZING

LOOPER

AND

NEEDLE

MOTIONS

NOTE:

End

cover

has

been removed

for

clarity

in

Figure

4,

but

MUST

BE

IN

POSITION

WHILE

MAKING

THE

FOLLOWING

ADJUSTMENTS.

Looper

drive

belt

(A,

Fig.

4)

has proper

tension

if,

when

turning

handwheel

in

operating

direction

to

position

looper

in

the

center

of

its

(right

to

left)

travel

there

is

no

noticeable

{right

to

left)

play

in

the

looper

mechanism.

There

should

be

approximately

1/8

inch

(3.2mm)

deflection

in

looper

drive

belt

when

pressing

firmly

with

thumb,

midway

between

sprockets

(8 and C).

Adjustment

can

be

made

by

1ooseni

ng

two

screws (A,

Fig.

5)

and

turn

looper

module

(D,

Fig.

4) counterc1

ockwi

se to

tighten

be

1t

or

clockwise

to

loosen,

as

viewed

in

Figure'

4.

Retighten screws (A, Fig.

5).

To

synchronize machine,

remove

needle bar

eyelet

guard,

needle

thread

take-up wire

holder,

needles,

presser

foot,

throat

plate,

looper,

and

feed dogs.

Turn

handwheel

to

position

needle

bar

at

BOTTOM

of

stroke

and

looper

holder

at

EXTREME

right

end

of

travel.

8

From the library of: Superior Sewing Machine & Supply LLC

SYCHRONIZING

LOOPER

AND

NEEDLE

MOTIONS

(Continued)

Using gauge

No.

21227

R,

mount gauge

plate

with

throat

plate

attaching

screws.

Insert

(included

with

gauge)

into

looper

holder.

Mount

indicator

block

to

machine

head

with

one

of the screws

removed

from

needle

bar

eyelet

guard.

Insert

shank

of

indicator

gauge

into

indicator

block

and

tighten

screw

against

shank.

See

Sketch

A

for

reference.

Rotate

handwheel in

OPERATING

direction

until

the

in

looper

holder

contacts

gauge

plate.

Loosen screw

{A,

Fig.

6)

in

needle

bar

connection

(B) and

position

needle

bar

(C)

as

required

to

set

the

pointer

of

indicator

gauge

at

"0" and

tighten

screw

(A)

VERY

LIGHTLY.

NOTE:

This

screw

is

specifically

tightened

to

ONLY

10-

12

in-lbs

(12-

14

em/kg).

Rotate

handwheel

in

REVERSE

direction

until

in

looper

holder

again

makes

contact

with

gauge

plate

and

note

the

reading

on

the

gauge. A

variation

of

(1)

graduation

on

the

scale

is

permissible.

If

the

reading

is

above

"0".

loosen

screws (E,

Fig.

4) and

turn

rear

looper

drive

sprocket

(B)

towards

the operator (clockwise

as

viewed

in

Figure

4).

If

the

reading

is

below

non,

turn

sprocket

away

from

operator

(counter-

clockwise

as

viewed

in

Figure

4).

Tempor-

arily

snug

screws.

Rotate

handwheel

in

OPERATING

direction

until

in

looper

holder

contacts

gauge

plate

and

note

the

reading

on

scale.

If

the

reading

is

above

"0".

loosen

screws

{E)

and

turn

sprocket

{B)

away

from

operator

(counterclockwise

as

viewed

in

Figure

4).

If

the

reading

is

below

"0",

turn

sprocket

towards

the

operator

(clockwise

as

viewed

in

Figure

4).

Temporarily

snug

screws.

Continue

OPERATING

pointer

of

graduation

handwheel

tightening

have

.002

sprocket

connecting

to

check and

adjust

in

both

and

REVERSE

directions

until

indicator

gauge comes

within

(1)

on

the

scale

when

turning

the

in

either

direction.

Before

screws (E)

securely,

be

sure

to

inch

(.051mm)

clearance

between

(B)

and

needle

guard

drive

rod

(F).

9

Fig. 5

Sketch

A

Fig. 6

From the library of: Superior Sewing Machine & Supply LLC

A

lr.?

SYNCHRONIZING

LOOPER

AND

NEEDLE

MOTIONS

(Continued)

LOQPFR

I~

FRONT

OF

t\Ei:OLE

Sketch B

OPERATING

DIRECTION

If

a

synchronizing

gauge

is

not

available

...

turn

the

handwheel

in

operating

direction

to

position looper point

even

with the

left

side

of

RIGHT

needle

and check

the

distance

from

the

eye

of

needle

to

the

bottom

of

1

ooper

blade.

Turn handwheel

in

reverse

direction

to

position

looper

point

even with

the

left

I OOPFR

BEHIND

NEEDLE I '

side

of

RIGHT

needle

and

check

the

distance

from

the eye

of

needle to the bottom of

looper

blade.

If

the

distance

was

greater

when

handwheel

was

turned

in

operating

direction.

as

shown

in

Sketch

B, 1oosen

screws

(E,

Fig.

4)

and

turn

rear

looper

drive

sprocket

(B)

away

from

operator

For

Proper

SYNCHRONIZATION

of

looper

&

Ne~dle

the same

AI()H

Sketch C

REVERSE

DIRECTION

1

(counterclockwise

as

viewed

in

Figure

4).

If

the

distance

was

greater

when

handwheel

was

turned

in

reverse

direction~

as

viewed

in

Sketch

C,

turn

sprocket

towards

the

operator

Looper

BEHIND

Needle

--

-

Looper in

FRONT of

(clockwise

as

shown

in

Figure

4).

Needle

Temporarily

snug

screws.

Continue

to

check

;,

OPERATING

Direction

;,

REVERSE

Direction

and

adjust

in both

OPERATING

and

REVERSE

Ale!!

Sketch D

directions

until

the

distance

from

the

eye

of

the

right

needle

to

the

bottom

of looper

blade

is

the

same

in

either

direction,

as

shown

in

Sketch

D.

Before

tightening

screws

(E, Fig.

4)

securely,

be

sure to

have

.002

inch

(

.051mm)

clearance

between

sprocket

(B)

and

needle

guard

drive

connecting

rod

(F).

10

Fig. 7

From the library of: Superior Sewing Machine & Supply LLC

NEEDLE

BAR

ALIGNMENT

Insert

a

new

set

of

needles.

As

a temporary

setting,

the

TOP

of

needle

bar

(A,

Fig.

7)

should be approximately 2

inches

(50.8mm)

from

the

TOP

of

upper

needle

bar

bushing

when

needle

bar

connection

(B)

is

positioned

at

TOP

of

STROKE

as

shown

in

Figure 7.

Adjustment

can

be

made

by

loosening screw

{C)~

reposition

needle bar

up

or

down

as

required

and

tighten

screw

(C)

VERY

LIGHTLY

10 12

in-lbs

(12 -

14

em/kg)

maximum

torque.

Rotate

handwheel

to

ensure

that

needles

center

in

the

needle

holes

of

throat

plate

as

shown

in Figure 8. Adjustment

can

be

made

by

loosening

screw (C, Fig.

7)

slightly,

allowing

needle

bar

to

be

rotated

as

required,

while being

careful

to

maintain

the

temporary

height

setting

and

tighten

screw

(C)

AS

SPECIFIED.

An

additional

4-way

directional

adjustment

of

the

throat

plate

can

be

accomplished as follows:

IMPORTANT:

Adjustment

of

throat

plate

must

be

coordinated

between

needles

and

feed

dogs;

refer

to

11

FEED

DOG

SETTINGS

11

• Loosen

two

screws (A, Fig. 8)

in

throat

plate

support

(B).

Loosen

two

screws

(C)

which

secure

locating

ferrules.

allowing

the

throat

plate

support

to

be

repositioned

slightly.

Tighten

screws (C)

first,

then screws (A).

CAUTION!

Needle

bar

has a

special

coating.

DO

NOT

wedge

or

pry with any

type

of

tool,

as damage

to

same

may

result.

Should

needle

head

require

assembling

to

needle

bar,

TORQUE

14

-

16

in-lbs

(16-

18

em/kg).

LOOPER

SETTINGS

If

not

previously

done,

insert

a

new

set

of

needles.

With

looper

at

EXTREME

right

end

of

travel,

distance

from

centerline

of

RIGHT

needle

to

point

of

looper

should be dimension

("A", Fig.

9);

see

CHART.

Adjustment can be

made

by

loosening

screw (B) and

turn

screw

(C)

clockwise

to

increase

looper

gauge

or

counterclockwise

to

decrease.

Apply

pressure

against

upper

portion

of

looper

holder

(D)

to

the

left

while

making

this

adjustment

and

locking

with

screw (B).

Applicable

looper

gauge can

be

used

advantageously

in

making

this

adjustment.

Looper must

also

be

set

so,

as

it

travels

to

the

left

behind

the

needles.

NOT

to

contact,

but

with

a

clearance

of

.002

-.004 inch

(.051-

.102mm).

11

Fig. 8

Fig.

9

Fig.

10

From the library of: Superior Sewing Machine & Supply LLC

LOOPER

SETTINGS

(Continued}

Adjustment can be

made

by

loosening

screw

(B)

allowing

looper

holder

(D)

to

be

moved

forward

or

rearward

on

its

shaft,

as required. Apply pressure

against

upper

portion of looper holder to the

left

while tightening screw (B).

MACHINE

STYLE

LF632K200MV-8

LF632K200MV-12

LF633K200MM-16

LF633K200MN-16

LF633K200MW-16

Fig.

11

Fig.

12

DIMENSION

"A"

FIG.

9

5/32 inch

(4.0mm}

9/64 inch

(3.6mm}

1/8 inch

(3.2mm}

1/8 inch

(3.2mm}

1/8 inch

(3.2mm}

LOOPER

GAUGE

NO.

21225-5/32

21225-9/64

21225-1/8

NEEDLE

BAR

HEIGHT

Needle bar

height

is

set

correctly

when

the

point of looper

(A,

Fig.

10}

moving

from

right

to

left,

is

.020

inch

(0.5mm}

to the

LEFT

side of the

LEFT

needle

(B)

with

its

underside

even

with

the

TOP

of

needle

eye.

Adjustment can be

made

by

loosening

screw

(A,

Fig.

11}

and

move

needle bar

(B)

up

or

down

as required.

TORQUE

screw

(A}

to

10

-

12

in-lbs

(11.5-

14

em/kg}.

IMPORTANT:

Care

must

be

taken not to

disturb

ALIGNMENT

of needle bar while

making

this

adjustment.

CAUTION!

Needle bar has a

special

coating.

DO

NOT

wedge

or

pry with

any

type

of

tool,

as

damage

to

same

may

result.

LOOPER

AVOID

Machine

is

equipped

with

a

quick

adjustable

looper avoid

mechanism

to

accommodate

extreme

differences

in

needle

sizes.

As

the

looper

travels

from

left

to

right

with the needle

bar

descending, the

LEFT

needle should

contact

ONLY

the lower

THIRD

of the

back

of

looper blade. Adjustment

can

be

made

by

loosening

two

screws

(A~

Fig. 12)

and

turn

eccentric

stud

(B)

towards the plus

side

(counterclockwise)

for

MORE

looper avoid or

towards the

minus

side

(clockwise)

for

LESS.

When

properly

set,

tighten screws

(A}.

NOTE:

Whenever

looper avoid

is

changed,

always recheck

11

LOOPER

SETIINGS

11

•

12

From the library of: Superior Sewing Machine & Supply LLC

REAR

NEEDLE

GUARD

TIMING

AND

ADJUSTMENT

As

the

looper

travels

from

right

to

left~

position looper point

midway

between

the

right

and

center

needles

as

shown

at

('

1A

11

,

Fig. 13)

for

16

GAUGE

machines. For 8

and

12

GAUGE

machines, position looper point

even

with

the

right

side

of

right

needle.

At

this

time

the

rear

needle

guard

(B)

should

be

at

EXTREME

end

of

forward

travel.

Adjustment

can

be

made

by

loosening

two

screws (A,

Fig.

14)

and

rotate

needle

guard

eccentric

(B)

slightly

as

required

until

this

condition

exists.

Check

to

ensure

.002 inch

( .051mm)

clearance

between

needle

guard

eccentric

(B) and

looper

drive

sprocket

(C)

while

tightening

screws

(A)

securely.

Needle

guard

should

be

positioned

(left

to

right)

so

the

needles

center

in

the

width

of

their

guarding surfaces.

Adjust

by

loosening

collar

screw

(D)

and

pivot

link

screw

(E)

permitting

guarding

surface

to

be

centered

to

needles.

Position

collar

against

needle

guard

shaft

bushing

and

tighten

screw

(D)

securely.

Rotate

guard

as

required

to

obtain

.002

inch

(.051mm)

clearance

between

guarding

surface

and

needles.

Take up

thrust

by

exerting

pressure

against

collar

to

the

left

and

pivot

link

to

the

right

while

tightening

pivot

link

screw

(E)

securely.

As

the

looper

travels

from

right

to

left,

position

its

point

even

with

the

right

side

of

right

needle.

At

this

time,

the

height

of

needle

guard (A,

Fig.

15) should

be

positioned

so

the

lower

edge

of

its

guarding

surface

(B)

is

even with

the

TIP

of

RIGHT

needle (C).

Adjust

by

loosening

two

screws

(D),

reposition

as

required.

being

CAREFUL

to

keep

the

width

of

guarding

surfaces

CENTERED

to

needles

while

tightening

screws

(D).

NOTE:

Needle

guards

(individually)

required.

can be

front

bent

slightly

to

back,

if

IMPORTANT:

Chan~e

in

stitch

length

WILL

NOT

requ1re

change

in

needle

guard

setting,

but

a

change

of

needle

SIZE,

may.

13

Fig.

13

Fig.

14

Fig.

15

From the library of: Superior Sewing Machine & Supply LLC

Fig.

16

Fig.

17

Fig.

18

FRONT

NEEDLE

GUARD

Front

needle

guard (A,

Fig.

16)

is

magnetized

and must

be

positioned

vertically

to

provide

amp

1e c1

ea

ranee

on

a

11

sides

of

the

INNER

CONTOUR

of

1

ooper

when

1ooper

is

at

extreme

left

and

right

end

of

travel.

With

looper

even

with

the

right

side

of

RIGHT

needle,

needle

guard should

be

set

to

barely

contact

the needles.

Adjustments can

be

made

by

loosening

two

screws

(B)

to

reposition

bracket

(C) as

required.

,

..

retighten

screws. Loosen screw

(0)

allowing

needle

guard

(A)

to

be

moved

towards

or

away

from

needles as

required

....

retighten screw.

FEED

DOG

SETTINGS

Feed dogs

should

be

centered

in

throat

plate

with equal

clearance

on

both

sides

and

ends.

Feed dogs

should

be

level

with

and

parallel

to

the

top

of

throat

plate

as

they

begin

to

rise.

Feed dogs should

be

set

to

protrude

the

depth

of

a

full

tooth

or

approximately

3/64

inch (1.2mm) above

throat

plate,

at

highest

point

of

travel.

A

slight

4-way

directional

adjustment

of

the

throat

plate

can

be

accomplished

by

loosening

two

screws

(A,

Fig.

17)

in

throat

plate

support

(B).

Loosen

two

screws

(C)

which

secure

locating

ferrules,

permitting

movement

of

throat

p1

ate

support.

Reposition

as

required.

considering

BOTH

the

needle

ho

1

es

and

feed

dog s1

ots

in

throat

p1

ate.

Tighten

screws (C) FIRST,

then

screws

(A). Under

EXTREME

conditions,

a

very

slight

(right

to

left)

adjustment

of

feed dogs can

be

acquired

by

loosening

their

respective

feed

dog

holder

screws

•••.

RETIGHTEN.

Should

(front

to

rear)

adjustment

be

required.

remove

the

rear

feed

chamber

cover

which

is

secured

by

four

screws.

Turn

the

main

feed

(stitch

regulating)

knob

(A,

Fig.

18)

counterclockwise

while

simultaneously

ROTATING

HANDWHEEL

IN

OPERATING

DIRECTION

to

obtain

maximum

travel.

NOTE:

Collar

(A,

Fig.

19)

may

have

to

be

loosened

at

the

rear

of

bed

casting

on

the

main

feed

stitch

regulating

shaft.

Centralize

movement

of

main

feed

dog

by

loosening

Allen

screw (A,

Fig.

20) and

turn

eccentric

(B)

as

required.

14

From the library of: Superior Sewing Machine & Supply LLC

FEED

DOG

SETTINGS

(Continued)

Coordinate these adjustments to obtain

maximum

travel

and equal

clearance

at

both

ends

of

throat

plate.

Tighten

Allen

screw

(A)

TEMPORARILY.

Loosen

screw (

C,

Fig. 20)

and

rotate feed

rocker

tilting

shaft

(B,

Fig.

19)

slightly

as

required

while

ROTATING

HANDWHEEL

IN

OPERATING

DIRECTION

to

attain

maximum

forward

travel

of

feed

dogs,

yet

FLUSH

with

the

top

of

throat

plate

as

they

first

appear.

COORDINATE

this

adjustment

with

those

described

in

preceding paragraph. Apply a

slight

pressure

against

feed

rocker

tilting

shaft

(B)

to

ensure

no

BIND

or

SHAKE

at

the

rear

ENDS

of

feed bars while

tightening

screw

(C,

Fig.

20)

securely.

Tighten

Allen

screw

(A)

securely

and

collar

(A,

Fig.

19) on

the

main

feed

stitch

regulating

shaft

against

the

bed

casting.

Turn

main

feed regulator

knob

(A, Fig. 18)

clockwise

for

shortest

stitch

length.

Adjust

differential

feed

dog

(front

to

rear)

in

the

same

manner

as

main

feed

dog

by

loosening

collar

(C,

Fig. 19)

and

turning

differential

feed

knob (B,

Fig.

18).

Loosening

Allen

screw

(D,

Fig.

20) and

turning eccentric {E).

NOTE:

Adjustment

of

differential

feed

dog

should

not

require

resetting

of

feed

rocker

tilting

shaft

(B,

Fig.

19).

CAUTION!

While

adjusting

for

maximum

and

centralized

feed

travel,

continually

check c1earanee between

main

feed

dog

and

throat

plate.

Tighten

(stop)

collar

(C,

Fig.

19)

against

bed

casting

and

tighten

Allen

screw (D,

Fig.

20)

securely.

With

feed

travel

set

to

desired

stitch

length~

set

height

of

main

feed

dog (A,

Fig.

21)

as

spec1f1ed

by

loosening

its

mounting screw (B)

to

position

as

required.

Feed

dog supporting screw

(C),

located

in feed dog holder should be

adjusted

as required

to

support

feed

dog

before

tightening

screw (B)

securely.

Height

of

differential

feed

dog (A,

Fig.

22)

can be

set

by

1ooseni

ng

its

mounting screw (B)

to

position

as

required.

Tighten screw (B)

securely.

15

Fig.

19

Fig.

20

Fig.

21

From the library of: Superior Sewing Machine & Supply LLC

Fig.

22

Fig.

23

Fig.

24

CHANGING

STITCH

LENGTH

Stitch

length

is

controlled

by

the

distance

main

feed

travels

with

its

teeth

protruding

above

the

throat

plate,

which can

be

changed

by

turning

stitch

regulating

knob

(A,

Fig.

18) c1

oc

kwi

se

to

shorten

the

stitch

or

counterclockwise to lengthen

same.

Differential

feed

travel

is

controlled

independently

from main

feed

travel

by

turning

differential

ratio

feed

knob

(B,

Fig.

18) clockwise

to

gather

or

counterclockwise

to

stretch-the

material

between feed dogs.

NOTE:

Adjustments

were

performed

under

11

FEED

DOG

SETTINGS".

SPREADER

AND

Stationary

spreader

thread

guide (A,

Fig.

23)

should

be

positioned with

its

outer

front

edge 9/32 inch

(7.1mm)

to

the

front

of

the

centerline

of

right

needle.

The

left

rear

edge

of

the

(banana shaped)

SLOT

in

guide

(A), should

be

positioned

1/16

inch

(1.6nm)

to

the

right

of the

centerline

of

right

needle,

as

shown

in

Figure

24.

Front

to

rear

adjustment

can be

made

by

loosening

screw (A,

Fig.

25) while

left

to

right

adjustment

can

be

made

by

loosening

screw

(B).

When

stationary

spreader

thread

guide

is

properly

set,

tighten

screws

(A

and

B)

securely.

Fig.

25

16

From the library of: Superior Sewing Machine & Supply LLC

SPREADER

AND

(Continued)

With

needle

bar

at

TOP

of

stroke,

height

of

stationary

spreader thread guide should

be

positioned

with

its

UNDERSIDE

PORTION

(laterally

in

line

with

needles)

1/64

inch

(0.4mm) below

the

TIP

OF

RIGHT

needle

as

shown

in

Figure

26.

Adjustment

can be

made

by

loosening

screw

(A),

reposition

as

required

•• ,

IMPORTANT:

Care

must

be

taken to maintain

the

1/16

inch

(1.6mm) dimension

between the

left

rear

edge

of

SLOT

in

stationary

spreader

thread guide

to

centerline

of

right

needle,

while

tightening

screw

(A)

securely.

Spreader

(A,

Fig.

27)

should

be

positioned

so

its

upper

surface

clears

the lowest

edge

of

stationary

guide

(B)

by

.020

inch

(0.5mm) and

the

rear

side

of

spreader

blade

should

clear

the

shank

of

left

needle

by

1/64

to

1/32

inch

(0.4

to

0.8mm)

throughout

its

arc

of

travel.

Adjustment

can

be

made

by 1oosen i

ng

screws

(C),

reposition

as required

and

retighten

screws securely.

While

rotating

handwheel in

operating

direction,

spreader

should be

TIMED

so

it

begins

to

move

from extreme

left

position

to

the

right

as

needle

bar

descends 1/16 inch

{1.6mm)

from

TOP

of

stroke.

Adjustment can

be

made

by

removing top

cover,

1oosen

two

screws

{A,

Fig. 28)

in

hub

of

spreader

drive

eccentric

(B), advance

or

retard

eccentric

on

shaft

(C)

as

required.

When

proper

timing

is

obtained,

position

eccentric

on

its

shaft

(left

to

right)

so

as

to

ensure

that

spreader

connecting

rod

(D)

has

MAXIMUM

and

CENTRALIZED

SHAKE

(left

to

right)

while

tightening

screws

(A)

securely.

I7

Fig.

26

Fig.

27

Fig.

28

From the library of: Superior Sewing Machine & Supply LLC

\ I

/;;:,

' .''·f-' '

Spreader

at

lot~~

I

~

it's

farthest

o"'"trf,f-;'

position

to

LEFT

~

1

~,;1,

, ; 1

1,

\

I'

''

-j

I·

I'

\ ' •

Spreader

at

~~

·

1

1~D

it's

farthest

..-----[1

\I\

position

'o

RIGHT

I,~~

~

\

~

.,

::;..---:

c:~

B A

A 1

5~1

~----------------~

Fig.

29

7/32"

(5.6mml--l

Fig.

30

Fig.

31

SPREADER

AND

(Continued)

Spreader

travel

e'X

11

,

Fig.

29)

is

measured

by

p1

acing

a

sea

1e between

the

two

extreme

spreader

arc

travel

points

{not

considering

the

arc),

as

shown

between

points

{A

and

B).

See

chart

for

specified

dimensions. Adjust-

ment can

be

made

by

1ooseni

ng

nut

(

E,

Fig.

28),

move

connecting

rod

(D)

upward

to

shorten

spreader

travel

or

downward

to

lengthen spreader

travel.

After specified

length

of

travel

is

obtained,

tighten

nut

(E)

securely.

MACHINE

STYLES

LF632K200MV-8

LF632K200MV-12

LF633K20DMM-16

LF633K200MN-16

LF633K200MW-16

SPREADER

TRAVEL

11

X

11

33/64

37/64

5/8

inch

(13.1mm)

(14.7mm)

(15.9mm)

(15.9rrm)

With

spreader

at

extreme

LEFT

end

of

travel

the

TIP

of

thread

carrying

notch

(A,

Fig.

30)

should be 7/32

inch

(5.6mm)

to

the

left

of

the

centerline

of

LEFT

needle. Adjustment

can

be

made

by 1ooseni

ng

two

screws

{A.

Fig.

31)

allowing

spreader

holder

(B)

to

be

rotated

on

its

shaft

to

attain

dimension

shown

in Figure

30.

IMPORTANT:

Take

up

thrust

between

spreader

holder

shaft

lever

(C, Fig. 31)

and

spreader holder

(B)

while

tightening

screws

(A)

securely.

Recheck

spreader height.

18

From the library of: Superior Sewing Machine & Supply LLC

SPREADER

AND

(Continued)

With

needle

bar

at

BOTTOM

of

stroke,

spreader

thread

eyelet

(A,

Fig.

32)

should

clear

stationary

spreader

thread

guide

(B)

by

approximately

1/32

inch

(O.Bmm)

and

aligned

as

close

as

possible

with the

center

of

the

SLOT

in

same.

If

adjustment

is

required,

care

must be

taken

NOT

to

disturb

alignment

of

needle

bar.

Loosening

screw

(C)

which

allows a

4-way

directional

movement

of

eyelet

(A).

Retighten

screw

(C).

Needle

thread

guide

wire

(D)

should

be

centered

around

the

needles

and

as

close

as

possible

to

same

without pinching the

threads.

Adjustment

can

be made by

loosening

screw (E), reposition as required

and

retighten screw.

Spreader

thread

take-up

(A,

Fig.

33)

should

be

centered

(left

to

right)

between

eyelet

inserts

in

tension

bracket

(B).

It

should

also

be

positioned

to

travel

approximately

equal

distance

(front

to

rear)

of

eyelets.

Adjustment

can

be

made

by

loosening

screw

(C),

reposition

take-up

(A}

as

required

and

retighten screw

(C)

securely.

More

or

less

thread

can be

supplied

in

the

system

by

1ooseni

ng

screw

(D)

and

move

bracket

(B)

downward

for

more

thread

or

upward

for

less

thread.

Retighten

screw

(D)

securely.

PRESSER

BAR

AND

PRESSER

FOOT

With

needle

bar

at

bottom

of

stroke

and

presser

foot

resting

squarely

on

throat

plate.

there

should

be

a

minimum

clearance

of

1/64

inch

(0.4mm) between

the

bottom

of

screw

(A, Fig. 34)

and

bottom

of

slot

in

presser

bar

guide

plate

(B). At

this

time,

there

should

be

at

LEAST

1/32

inch

(O.Smm)

clearance

between bottom

of

presser

bar

guide

and

top

of

lower

presser

bar

bushing. There

should

also

be

1/16

inch

(1.6mm)

clearance

between bottom

of

slot

in

lifter

lever

link

(C) and

bottom

of

presser

bar

guide

(D)

when

foot

lifter

lever

is

released.

If

adjustment

is

required,

proceed

as

follows:

19

',

...

-

Fig.

32

Fig.

33

Fig.

34

From the library of: Superior Sewing Machine & Supply LLC

Fig.

35

Fig.

36

Clearance

with

foot

at

highest

position

PRESSER

BAR

AND

PRESSER

FOOT

(Continued)

Back

off

presser

bar spring

regulator

to

release

tension

on

spring.

Loosen

two

screws

(E)

in

presser

bar

guide

(D).

Loosen

nut

(F)

and

turn

screw

(A)

down

against

guide

plate

(B)

to

obtain

at

least

5/64

inch

(2.0mm)

clearance

between bottom

of

presser

bar

guide

(D)

and

guide

plate

(B).

Align

presser

foot

with needles

and

press

down

FIRMLY

while

tightening

two

screws

(E)

in

presser

bar

guide

(D).

NOTE:

This

setting

was

necessary

to

prevent

damage

to

the

scraper

edge

of

presser

bar bushing, should

presser

foot

be

removed

from

machine.

Turn

presser

bar

spring

regulator

down. Back

off

screw

(A)

to

obtain

the

1/64

inch

(0.4mm)

dimension between bottom of

screw and bottom

of

slot

in

presser

bar

guide

plate

(B),

lock

nut

(F).

loosen screw

(G)

in

lifter

arm

(H)

and

rotate

ann

slightly

as

required

to

obtain

the

1/16

inch

(1.6mm)

dimension

between

link

(C)

and

guide

{D),

retighten

screw

(G)

ensuring

no

left

to

right

shake

in

lifter

arm (H).

Loosen

lock nut

(A,

Fig.

35)

and

adjust

screw

(B)

in

presser

foot

lifter

lever,

allowing

presser

foot

to

be

raised

to

its

highest

position without

interfering

with spreader,

as

shown

in

Figure

36.

Lock

nut

(A,

Fig.

35)

securely.

Adjust

presser

bar

spring

regulator

so

it

exerts

only

enough

pressure

on

presser

foot

to

feed

the

work

uniformly.

Turning

it

clockwise

increases

the

pressure,

counter-

clockwise

acts

the reverse.

2D

From the library of: Superior Sewing Machine & Supply LLC

UnionSpecial LF600 Series Setup guide

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