Singer 471U User manual

SERVICE

MANUAL

FOR

SINGER

MODEL

471U

THE

SINGER

COMPANY

From the library of: Superior Sewing Machine & Supply LLC

CONTENTS

MECHANISMS

|T|

Needle

bar

mechanism

m Rotary hook

mechanism

ITj

Needle

zigzag

mechanism 2

|T|

Feed

mechanism

m Clutch mechanism 4

B Cutter

mechanism

(1)

B Cutter

mechanism

(II) 7

[Tj

Upper thread cutter

mechanism

Lower

thread cutter

mechanism

[lo]

Presser

bar

lifter

mechanism

Tension

releasing

mechanism

fll]

Clutch

and

brake

fi2]

Cutter safety

device

[III Needle

bar

ini Rotary hook shaft 32

[i^ Upperclamping foot and

lower

thread

cutter

[I^

Base

needle

plateand cutter

position

control

Oil

Upper

clamping

foot

position

control

...

M Rotary hook 35

[li]

Lubrication

[2ol

Needle sidewise

movement

adjustment

(HI

Needle

zigzag

reference

position

adjustment

Scissors

assembly

position control

Scissors guide position control 38

[24]

Covers

((ADJUSTMENtH)

Needle

sidewise

movement

adjustment

Needle

bar

and

rotary

hook

adjustment

Upper

clamping

foot

lifter

adjustment

Cutter

adjustment

Buttonhole

width

and

reference

position

adjustment

Upper

thread

cutter

adjustment

Lower

thread

cutter

adjustment

Movable

knife

and

fixed

knife

adjustment

((DISASSEMBLY

PROCEDURES)).

Covers

Lower

thread

cutter

Presser

Rotary

hook

Upper

thread

cutter

Length feed

Clamping

foot

Cutter

safety device

[9] Clutch and brake

Feed

Needle

bar

Cam

relay

Upper

shaft

Auxiliary

shaft

Needle zigzag

Needle breakage detection

Cutter

Lower

shaft

and

rotary

ASSEMBLY

PROCEDURES 1

Lower

shaft

U] Cutter

IT]

Thread breakage detection

[Tj

Needle

zigzag

[Tj

Auxiliary shaft

|T| Uppershaft

m Cam relay

(D Feed

rri upper clamping foot

flo]

Upperthread cutter

15 m

18 m

21 M

21 mi

(Hj

Qzl

Belt shifter

adjustment

Lubrication

adjustment

Tension pulley

adjustment

Bobbin winder

adjustment

Main tension and auxiliary

tension

adjustment

Thread

breakage

detection

adjustment

Adjustment

for changing the

stitch

number

Cutter

safety device adjustment 57

Adjustment of feed cam segment 59

From the library of: Superior Sewing Machine & Supply LLC

(MECHANISMS

))

[T]

Needle

bar

mechanism

When

the

pulley

rotates

the

direction

the

arrow,

this

movement

transmitted

the

thread

take-up

crank O

fixed

on the end of the upper shaft

O-

The

needle

bar

crank

O is

fixed

to the

thread

take-up

crank

andan

up-down

motion

transmitted

tothe

needle bar clamp O through the needle bar crank rod

The

needle

barO is

fixed

the

needle

bar

clamp

and

guided

the

vertical

bushing

the

needle

bar

support 0 so that is moves smoothly up and down.

[T]

Rotary

hook

mechanism

When

the

pulley

0 rotatesinthedirection ofthearrow,this

movement

istransmitted tothetiming

pulley

fixed on the upper shaft

2. The

timing

belt0 is

wrapped

around

the

timing

pulley

U0 and

assures

sure

transmission

of the rotating

movement of the upper shaft to the timing pulley D

3. Thetiming

pulley

D0 is

fixed

to thelowershaft0 and transmitstherotating

movement

tothelowershaftgear

0 fixed to the end of the lower shaft

4. The rotary hook shaft gear0 mesheswith the lowershaft gear

and therotating movementistransmitted to

the rotary hook shaft

5. The rotating hook assembly 0 is

fixed

on the rotary hook shaft 0 and rotates completely.

- 1 -

From the library of: Superior Sewing Machine & Supply LLC

|T|

Needle

zigzag

mechanim

DilQvi

1. Whenthe

pulley

O rotates in thedirection ofthe arrow, the rotating movement istransmitted to the reduction

gear O

fixed

on the upper shaft

Q-

2. Thereduction gear©

meshes

with

thesubshaftgear

reduces

therotation oftheuppershaft© by

half,

and

transmits this motion to the sub shaft

©.

3. The

needle

zigzag

cam © is

fixed

to theauxiliaryshaft

©,

and the triangular portion of the

needle

zigzag

cam

fits in the needle zigzagforked link

©.

4. The upper end of the

needle

zigzag

forked

link

fitted

on the

needle

zigzag

link

©,

and an oscillating

movement is transmitted to the needle zigzag lever R © linked with the lower end of the needle zigzag forked

link

©.

5. The needlezigzaglever F © isfixed on the needlezigzagleverR © and causes the needlebarframe slideblock

o fitted on the end of the needle zigzag lever F © to oscillate.

6. The needle bar support slide block © fits in the groove of the needle bar support © and causesit to oscillate

back

and

forth.

-2-

From the library of: Superior Sewing Machine & Supply LLC

Feed

mechanism

When

the

upper

shaft

rotates

the

direction

the

arrow,

the

worm

fixed

the

upper

shaft

also

rotates.

2. The

worm

wheel

meshes

withthe

worm

o ,and therotating

movement

istransmitted tothe

worm

wheel

shaft

The

change

gear

attached

the

end

the

worm

wheel

shaft

meshes

with

the

change

gear

which

causes the change gear shaft 0 to rotate.

The

free

wheel

gear

fixed

the

change

gear

shaft

meshes

with

the

feed

cam

causing

it to

rotate.

The

roller

attached

the

end

the

feed

adjusting

lever

fits

inthe

heart-shaped

groove

ofthe

feed

cam

and

causes

the

feed

connecting

rod

0 to

move

back

and

forth

using

the

feed

adjusting

lever

shaft

0 asa

pivot

point.

The

end

the

feed

connecting

rod

linked

the

feed

drive

shaft

arm

pivot

point

and

causes

the

length

drive

shaft

feed

arm

clamping

foot

and

length

feed

plate

connected

the

feed

drive

shaft

arm

pivot

point 0 to move back and forth.

ffiGear

ratios

Change

gear

/30

rotation

Change

gear

reduction

gear

rotation

rotations

rotation

Bychanging the gear ratio (change gear combination) of the upper shaft rotation with respect to one rotation

(one

cycle)

the

feed

cam,

the

number

stitches

can

be varied

between

and

347.

-3-

From the library of: Superior Sewing Machine & Supply LLC

Clutch

mechanism

Starting

1. When the starting leverO islowered inthe direction of the arrow, it pressesagainst the lowerend of the clutch

lever causing it to pivot on the clutch lever shaft O ^nd move in the direction of the arrow.

2. When the clutch levere moves in the direction of the arrow, the stop leverclawO fixed on the stop lever0

rises to mesh with the clutch claw O fixed on the clutch lever 0

3. The belt shifter drive lever0 isfixed on the end of thestop lever

and the beltshifter roller 0 attached to the

lower end of this moves the top side of the belt shifter cam 0 attached to the belt shifter lever

4. The belt shifter lower 0 linked to the belt shifterlever 0 moves in the direction of the arrowto shift the flat belt

the

low-speed pulley.

Belt

shifter

The belt shifter U 0 and the belt shifter lower 0

fixed

the

clutch

lever

are

linked

the

movement

the

clutch

lever

and

shift

the

flat

belt

between

the

high-speed pulley

and

low-speed pulley so as to

transmit

stable

rotation

the

machine.

0-^

1)1

///

High-speed

pulley

-4-

From the library of: Superior Sewing Machine & Supply LLC

III

Stopping

When

thestopcamcontact plate0

fixed

tothestop

lever

comes

incontact

with

thestopcam

segment

®,

the

stop lever tongue O moves one step away from the clutch tongue

O-

When

thestopcamcontactplate0

fixed

to thestop

lever

comes

incontactwiththestopcam

segment

thestop

lever

tongue

moves

away

from

the

clutch

tongue

and the

clutch

lever

returnspring

moves

the

clutch

lever

0 backinthedirection ofthearrow.Theclutchstopper0 entersthe

groove

onthestopcam0 and

stops the machine.

Emergency

stopping

1. When the emergency stop arm 0 is pushed down,

the tongue of the emergency stop lever 0 meshes

with the clutch tongue

and the machinegoesto

slow-speed

operation.

2, When the emergency stop arm 0 is released, the

tongue of the emergencystop lever0 movesaway

from the clutch tongue

and the machinestops.

-5-

From the library of: Superior Sewing Machine & Supply LLC

Cutter

mechanism

(I)

When the sub shaft O

moves

in the direction of the arrow, the cutter eccentricrod O fitted to the cutter

eccentric wheel O fixed on the sub shaft oscillates.

The

cutter

drive

lever

O is

linked

to the

end

ofthecutter

eccentric

rodO andso

oscillates

inthe

same

way.

When

thecuttercam

segment

0 attachedto the

feed

cam

pushed

against

thecutterpushbar

the

clutch

riding on the clutch collar 0 moves to the clutch set collar

4. When the cutter push bar 0 movesaway from the cutter cam segment

the clutch 0 falls in between the

clutch collar 0 and the clutch set collar

When

this

happens,

the cutter

drive

lever

0 entersthe dent in the

clutch

0 and

lifts

it up.

6. Thelowerendoftheclutchis

linked

tothecutteroperationarm0 andcausesthecutteroperationlink0

linked

to the end of the cutter operation arm 0 to move up and down.

7. Thecutter holder0 islinkedtothecutter operationlink

and thecutteroperationshaft0

fixed

tothecutter

holder 0 is moved up and down.

-6-

From the library of: Superior Sewing Machine & Supply LLC

|T]

Cutter

mechanism

(II)

Cutter

drop

prevention

mechanism

during

thread

breakage

I. Whenthe needlethread breaks, the thread breakage perceivingleverO automaticallycomesdown,and theend

ofthecutter

clutch

stopper

fixed

to the

thread

breakage

perceiving

lever

shaft

catches

onthepinofthe

clutch O and stops the cutter from falling.

Stop

cam

tab

Thread

take-up

lever

link

Lever

Cutter

drop

prevention

mechanism

during

high-speed

operation

1. When the clutch lever rises, the cutter stop connection rod 0 is pushed in the direction of the arrow, and the

movement is transmitted to the cutter stop lever O linked to its end.

2. The cutter stop levershaft O is fixed to the cutter stop leverO and transmits the movementto the stop lever

bracket

3. The clutch stop leverbracket O fixed to the stop leverbracket O ismoved inthe direction of the arrow. This

holds the pin of the clutch O and locks it securely in place, thus stopping the cutter from dropping.

-7-

From the library of: Superior Sewing Machine & Supply LLC

Upper

thread

cutter

mechanism

Clamping

Cutting

thread

Scissors

Clamping

foot

1. Whenthe presser bar lifterconnectingrod O movesinthedirection ofthe arrow, presserlifter0 drops down in

the direction of the arrow pivoting on presser lifter lever shaft

2. The trimming clutch guideO isfixedon the end of the presser lifter ^nd the clutch cam0 isfixedon this and

drops

down in the same way.

3. When the clutch cam 0 comesaway from the trimming clutch plate

the upper thread trimming leverO is

moved in the direction of the arrow by the scissors operating spring

4. The upper thread trimming lever B O is

fixed

to the end of the upper thread trimming lever

and the

movement is transmitted to the scissors D 0 fixed on the upper thread trimming B

5. The scissors M 0 attached to the scissors D 0 come in contact with the clamping foot, and the scissors M0

cut

the

needle

thread.

6. The scissors guide 0 fixed on the length feed arm advances in the direction of the arrow when the machine is

started, and the scissors M 0 open.

-8-

From the library of: Superior Sewing Machine & Supply LLC

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