Brother T-8720A User Manual

-8720A

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TWIN NEEDLE LOCK STITCHER WITH LARGE HOOK

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17 19

21 23 25

. 27

29

31 32 33

37

0

Notes for using this parts book

1.

This book was prepared based on information available

2.

Parts are subject to changes

3.

Parts supplied as complete assemblies are circled by a dotted line

4.

If the

symbol*

gauge parts list on page 32 -36.

is found

in

design without prior notice.

the"

Parts No." column, refer to the different parts lists,

in

May 2004.

CONTENTS

A.

Machine body

B.

Upper shaft mechanism ......................... 3

C.

Needle bar rocking mechanism .............. 5

D. Presser foot mechanism ........................ 7

E.

Feed mechanism .................................... 9

F.

Feed shaft mechanism ...........................

.. .. .. .. .. .. ..

..

.. ..

..

.. ..

....

..

.. .. ..

f.'

.'.'.·.·.·.·.·.·.

. 1

11

'J.

G

1.

Rotary hook mechanism

G2. Rotary hook mechanism ......................... 17

H.

Gauge parts

.. ..

....

.. .. ..

..

......

.. .. .. ..

.... . 13

..

....

.. ..

..

.. .. ..

....

.. .. ..

..

J. Lower shaft mechanism......................... 19

K.

Lubrication ..............................................

L.

Threading mechanism

M. Bobbin winder mechanism..................... 25

Z1. Accessories ............................................ 27

Z2. Accessories............................................ 29

Wa. Warning labels ......................................

Sp. Different parts list ................................... 32

Ga. Gauge parts

Index....................................................... 37

list ...................................... 33

.. .. ..

....

.. ..

....

.. .. .. ..

..

17

21 23

31

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REF.

1 2 3 4 5 6

7

8

9 10 11 12 13 14 15 16

17

18

19 20 21

22 22

NO

CODE

140063001 5A3924001 5A2440001 5A2929001

062500816 2 7-"::J5X8 5A2441001 1

062501216 7 7-"::J5X12 5A2443001

062500616 2 7-"::J5X6 5A2444001 5A2445001

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SLIDE SCREW, SET RUBBER RUBBER LABEL, GROUNDING

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PLATE

CAP,

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COVER PROTECTOR

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PLATE

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PLATE F ASSY

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SCREW,

CAP, 12.5 CAP, 12.5

For

Japan

CAUTION

for

CAUTION

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M5X8 M5X12 M5X6

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ASSY,

SM3.18-40X4

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NAME OF

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10 11 12 14 15 16 17 18 19 20 21 22 24 26 27 30 31 32 33 34 35 36

8A2746201 8A4089001

825234001 838707001 838398001 8A4335001

113014000 825260001 8A1120001

823651001

825235001

825236001

076023800

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158115001

012061036 8A2720001

823651001

8A2463001

8A2937101

8A2861001

012061036 813160001 8A2469001

062500816

8A3057001

8A3058101

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062500816

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CODE

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SHAFT.

TAKE-UP BEARING, BEARING,

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6X6(L=90) PUSHER SET

SCREW,SOCKET BOBBIN SET SCREW, SET BALL SET

WINDER

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SCREW, DUST SHELTER

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SLIDE

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SHELTER

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NAME

ST

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(FT)

DRIVING

(FT) (FT)

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T-8720A-109

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REF.NO

1 2 3

4

5

6

7

8

9

10

11

12

13

14

15

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

CODE

8A4124101

8A3854001

8A2474001

062401016 8A2475001 8A3710001

062350816

112728001 8A3711001 8A3712001 8A2482001 8A2483001 8A2484001

148394000

8A4007001

062500616 8A3848001 807465000

8A3852001

8A2485001 825260001 8A2486101

062500816

062061616 8A2489001

018062032

118735002 8A2490101 823460001

8A4117001

012060636 8A4118001

018062532

8A2493001 8A2494001 1

018062032

I Needle bar rocking mechanism

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SCREW, NEEDLE NEEDLE SCREW, WICK, CRANK SLIDE NEEDLE

BAR

ROCKER

BAR

BASE

BLOCK

PAN

SLIDER

M4X10 BAR BAR

CLAMP

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BLOCK

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PLAIN

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M5X8

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LINK,

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LINK

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SOCKET BUSH,

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U

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P

ARM

OF

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SHAFT

M6X5

LEVER

(FT)

M6X6

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1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

I Presser foot mechanism

CODE

SA2495001

062500816 SA1174001 SA1175001

141208001

807346101 SA2496001

5A2498001

525289001 5A2499001

531006001

539051001

507353001 012061832

021080306 5A2500001 5A2501001 5A2502001 5A1179001

507349001 5A2504001

012500536

507355051

062501416 1

021500106 5A2506001 5A2507001 5A1179001 5A2165001 5A1179001 5A4149001

021060306

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PRESSER SCREW, PESSER ADJUST SPRING PRESSER PRESSER GUIDE

BOLT, (CP) PRESSER

LIFTING

SCREW,

TENSION

SET NUT, KNEE PRESSER KNEE SHOULDER P-BAR SET SET SPRING, SCREW, NUT, 1 MS KNEE KNEE SHOULDER SHOULDER SHOULDER ADJUSTING NUT, 3 M6

BAR

PAN

ADJUSTING SCREW GUIDE

BAR BAR

BRACKET,

M6X10

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LEVER

PAN

RELEASE

SCREW,

3M8

LIFTER

BAR

LIFTER

SCREW,

LIFTING SCREW SCREW,

EXTENSION

PAN

LIFTER LIFTER

SCREW, SCREW, SCREW, SCREW,

NAME

OF

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M5X8

SCREW,

NUT

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LIFTING

(S/P

SOCKET

C-ROD

LIFTING

CONNECTING

LEVER

COLLAR

SOCKET

M5X14

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P-BAR

W) M3.

PLATE

{FT)

ASSY

MS

SHAFT

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MS M6 MS

6

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5X12

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PARTS

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10 11 12 13 14 15 16

17

18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

42 43 44 45 46

47 48 49 50 51 52 53

LJ

IMH*

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CODE

5A3062001 5A2511001

062501016

5A2512001

SA2515001

5A2516001

062060816

143611201 143612100

118954000 SA2791001 5A2585001

S25236001 5A2793001

018062032

143613051 143616001 048060342

S38428001 5A3056001

142746002 129458102 108549001

S50098101

100328001

SA2523001

S39830101 SA2796001

016061031 5A2526001 5A2527001

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048080342

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507374109 5A2531001 5A3067001

548367000

062501216

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12

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'T'.:JI--5

FEED

REGULA

GUIDE

SCREW, SLIDE

BLOCK

PLATE

PAN

TOR

M5X10

ASSY

FELT

STOPEER SCREW, PAN F-ROCKER FEED NEEDLE LEVEL SET

SCREW,

SET

SCREW, SOCKET FEED BOLT,

M6X8

CONNECTING

ROCKER

BEARING

FEED

ECCENTRIC

SOCKET

ROCKER

SOCKET

CONNECTING

ARM

M6X20 LINK SHAFT RETAINING STITCH FEED FEED

SCREW,

RING,

LENGTH

REGULATING

SM4.76 ORING POSITIONING NOTCH DIAL

LOCK

SPRING

LEVER

SPRING

FEED

REGULATOR

SET

SCREW, CONNECTING ECCENTRIC SET

SCREW, SOCKET SHOULDER

SOCKET

ROD

SHAFT

SCREW, SHAFT, R-LEVER RETAINING WASHER,

RING,

PLAINS SPACER REVERSE

STITCHING SPRING LEVER

GUIDE RUBBER SCREW, WASHER, RUBBER SCREW,

PAN

MSX12

PLAIN

CAP, 10.5

PAN

M5X8 STOPPER SCREW, WASHER,

FEED

SPRING

SCREW, PAN SCREW,

PAN

M5X12

PLAIN

REGULA

TOR

HOOK

M6X8

PAN

MSX12

NUT, 1 MS

NAME

OF

ASSY,

11

ROD

WHEEL (FT) (FT)

7

E6

DIAL,

7 STUD SUPPORTER

7

(CN)

(FT)

M6

TR

E8

10

LEVER

L 5

M 5

SPRING

PARTS

ASSY

ROD

M6

M6X10

M6X6

RM

7

T -8720A-202

10

Brother T-8720A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual