Brother EF4-B561 User manual

SERVICE MANUAL
FOR
BROTHER MODEL EF
4- 8561
,
571
MA4-B581
BROTHER INDUSTRIES , LTD.,
NAGOYA . JAPAN .
From the library of: Superior Sewing Machine & Supply LLC

CONTENTS
Page
1. FEATURES I· ...................................................
2. SPECIFICATIONS I................................................ 2
3. DESCRIPTION OF
MECHANISM I· ..................................... 9
[!] Needle bar mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 9
[g) Under looper mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 9
[a] Over looper mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 9
III Double chain stitch looper mechanism· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 10
00 Knives mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 10
liD Feed mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 11
[1] Presser foot mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 12
4. DISASSEMBLING PROCEDURES I· ..................................... 12
[l] Cover · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 12
[g) Presser foot and feed mechanism· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 13
~ Knives mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 13
III Under looper mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 14
00 Over looper mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · : · · · · · · · · 14
liD Double chain stitch looper mechanism· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 15
[1] Needle bar mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 15
5. ASSEMBLING AND ADJUSTMENT PROCEDURES I· ........................ 16
[!] Needle bar mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 16
00 Under looper mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 18
[a] Over looper mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 19
III Double chain stitch looper mechanism· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 20
I]] Knives mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 21
liD Feed and presser foot mechanism · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 23
[1] Looper thread take-up and thread·guide mechanism · · · · · · · · · · · · · · · · · · · · · · · · 24
[ID Double chain stitch looper thread take-up and thread guide mechanism · · · · · · · · · · 25
[ID Cover · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 26
.~""".. 6. STITCH LENGTH AND DIFFERENTIAL FEED ADJUSTMENT I· ...............27
7.
SEWING INSTRUCTION I· ...........................................28
[!] Single needle two thread · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 28
00 Single needle three thread · · · · · · • · · · · · · · · · · · · · · · ·.· · · · · · · · · · · · · · · · · · · 29
[a] Twin needle four thread · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 31
III Twin needle five thread · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 31
8. TROUBLE SHOOTING I· ............................................32
[!] Thread breakage (Overlock Stitch Needle) · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 32
[g) Thread breakage (Looper Thread) · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 33
[a] Skip stitching (Overlock Stitch) · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 34
III Needle breakage · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 36
[§] Improper thread tension · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 36
liD Wrong chaining-off (Overlock Stitch) · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 36
[1] Excessive wrinkles . . . . · · · · . · · · · · · . · · · · · · · · · · · · · · · . . · · · · · · · · · · · · · · · 37
[ID Slipage of cloth ..... · · . · ... · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 37
From the library of: Superior Sewing Machine & Supply LLC

1. FEATURES
1. These models have the same sewing performance as the high-speed types (Models EF4-BS11, B531 and
MA4-B551) so they can be used for normal stitching, ruffling, bulky stitching and many other applica-
tions.
2. Differential feed ratio can be changed by a "banana
type" device which assures a wide differential
range.
3. High-lift specifications
··· 7mm in presser foot rise and 7mm in maximum stitch width ··· are available
for denim bulky and other thick materials.
4. Blade engaging angle can be easily adjusted for sharp cutting performance.
5. Oil level in the oil pan can be easily checked with the special oil guage on the front.
6. Superb design and colour brighten working environment and ensure to lessen the operator's fatigue.
* Most of the gauge parts, expendable parts, attachments and other devices of these models are inter-
changeable with those
of Models EF4-B511, B531 and MA4-B551. -~
- 1-
From the library of: Superior Sewing Machine & Supply LLC

2.\ SPECIFICATION
$ BROTHER INDUSTRIES LTD.
EF4-B561- / / I
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41'
0
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==
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(b)
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Maoumum
Height
Pitch
Differential
Maxomum
Needle stotch
of sewing
Sub-class
Stitch form No. of No. of
gauge Bight length Differential presser
(mm)of
Type of
Needle speed
No
needle thread (mml (mml (mm) feed ratio foot feed dog feed dog
IDCx1)
(spm) Usage (material) Attachment
001-3
3
II
Thin, medium
-4
? 4 #11
-5
1 3 -5 3.6 0.3"'1.8 6 1.6
II
5000 Knitted underwear, -
-6
6 shirts.
Sportswear
002-5
5
II
Bulky knit
-6
? 1 3 -6 2.5 0.4"'3.6 7 2
#14
5000 Sweater -
~
-7
7
hi
Cardigan
Bulky sweater
003-3
? 3
II
Blind hemming
-4
#9 Knitted underwear,
·Blind
1 3 -4 3.6
O.J......1.8 6 1.6
II
5000 hemming
_LV
shirts.
-5
5 Tee shirts ruler
004-3
? 3
II
Blind hemming
-4
1 2 4 3.6 0.3
...... 1.8 6 1.6 #9 500 Knitted underwear,
·Blind
-
II
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shirts. hemming
-5
5 Tee shirts ruler
005-3
3
II
Serging
-4
? 4 Trousers •Edge
-5
1 2 -5 3.6
O.J......1.8
4 1.6
II
#14
5000 hemming
Skirts
-6
6 ruler
006-3
3
II
Serging
-4
? 4 •Edge
-5
1 3 -5 3.6 O.J......1.8 4 1.6
II
#14
5000 Trousers hemming
~
Skirts
-6
6 ruler
007-2
? 2
II
Curling
-4 1 3 -4 3.6
O.J......1.8 6 1.6
II
#11 5000 Handkerchief -
_J
Scarf
*
008-5
?
II~
Ruffling
1 3 -5 3.3
O.J......2.7
5 1.6 #11 5000
Coasts for women & •Ruffler
-lfjJr
children.
*
on
Negligee
-2-
From the library of: Superior Sewing Machine & Supply LLC

SPECIFICATION
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(b)
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Maxomum Height
Differential
Maxomum
Needle stotch
of
Pitch
sewong
Sub-class Stotch
form
No. of
No of
gauge
Boght length Oifferentoal presser
lmmlof
Type of
Needle speed
No
needle thread
(mml
(mm) mml
feed ratio
foot
feed dog feed
dog
IDC·ll
(spml Usage tmateroall Attachment
009-5
7
~~~
Ruffling (w/piping) ·Wrapper
1 3 -5 3.3 0.3--2.7 5 1.6 #11 5000 Coasts
for women •
Ruffler
J__j
& children. ·Tape-
* u
n~
Negligee winder
010-3
7 3 n
Thin, medium taping
-4 4
Knitted underwear, ·Tape-
-5
1 3 -5 3.6 0.3--1.8 6 1.6
II
#11 5000 guide
_jjj shirts.
~~
-6
6 Tee shirts -
011-5
?\
5
II
Bulky knit taping
-6
#14
Sweater ·Tape-
1 3 -6 2.5 0.4--3.6 7 2 5000 guide
_jjj
hi
Cardigan
-7
7
Bulky sweater
*Extra cost of attachment will be required for the sub-class marked with asterisk.
-3-
From the library of: Superior Sewing Machine & Supply LLC

SPECIFICATION
fa& BROTHER INDUSTRIES L TO.
EF4-B571-
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Pitch
Difforential
Max1mum
Sub-class
Stitch form
Needle stitch
of
lmm)of
Type of
SOWing
No. of
No. of
p.auge
Bight
ength Differential rcresser Noodle speed
No. noodle thread
mml
(mm) mmt feed ratio
001
feed dog feed
dog
(0Cx1)
(spml Usage (material) Attachment
021-4
4
II
Thin
-5
? 2 4 1.8 5 3.6
0.3-1.8
6 1.6
II
#11 5000 Knitted & tricot -
(DCX3) underwear
022-5
5
~~
Thin, medium
-6
? 2 4 2.2 6 3.6
0.3-1.8
6 1.6
Ill
#11 5000 Knitted underwear, -
shirts.
~
-7
7 Tee shirts
023-5
? 5
~~
Thin, medium
-6
2 4 2.2 6 3.6
0.3-1.8
6 1.6
ll1
#11 5000 Collared shirts -
Blouse
-7 mock 7
024-5
II
Thin, medium
? 2 4 3 5 3.6
0.3-1.8 6 1.6
ll1
#11 5000 Knitted underwear, -
shirts.
Tee shirts
025-6
?
II
Thin, medium
2 4 3 6 3.6
0.3-1.8
6 1.6
ll1
#11 5000 Collared shirts -
Blouse
mock
026-4
4 n Bulky knit
-5
? 2 4 1.8 5 2.5 0.4--3.6 7 1.6
II
#11 5000 Sweater -
r---
(DCX3 Cardigan
Bulky sweater
027-5
5
II
Bulky knit
-6
? 2 4 2.2 6 2.5
0.4-3.6
7 2
#14
5000 Sweater -
IIi
Cardigan
-7
7 Bulky sweater
028-5
5
II
Bulky knit
-6
? 2 4 2.2 6 2.5
0.4-3.6
7 2
#14
5000 Sweater -
hi
Cardigan
-7
mock 7 Bulky sweater
031-7
~~
Extra heavy
~~
2 4 3 7 3.6 0.3-1.8 7 2.5
ll1
#21 5000 Denim -
Curtain
Cushin
032-7
?
II
Extra heavy
2 4 3 7 3.6
0.3-1.8
7 2.5
ll1
#21 5000 Denim -
Curtain
mock Cushion
-4-
From the library of: Superior Sewing Machine & Supply LLC

SPECIFICATION
~BROTHER INDUSTRIES l TO.
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Mu•mum
Needle stitch Otfferent•al of
(mm)of
Type of
sewtng
Sub-class Stitch
form
No. of
No. of
gauge Bight length prosser Needle speed Usage lmatonall
No. needle thread (mml
lmml
lmml
feed rat•o
foot
feed dog feed dog
IOCx 11
(spml Anachment
033-5
7
ij~l
Ruffling
3 4 2.2 5 3.3 0.3--2.7 5 1.6 #11 5000 Coats
for women &
·Ruffler
-/f!J
& children
HH~
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-
034-5
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It
Ruffling
mock
2 4 2.2 5 3.3 0.3--2.7 5 1.6 #11 5000 Coats
for women & •Ruffler
~
& children
~
*
no
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037-5
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Ruffling (w/piping) ·Wrapper
2 4 2.2 5 3.3 0.3--2.7 5 1.6 #11 5000 Coats
for women & •Ruffler
J!j
& children ·Tape-
*
no
I Blouse winder
-
038-5
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ijt
Ruffling (w/piping) •Wrapper
2 4 2.2 5 3.3 0.3--2.7 5 1.6 #11 5000 Coats
for women & •Ruffler
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children •Tape-
*
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041-5
? 5
~~
Thin, medium taping
-6
2 4 2.2 6 3.6 0.3--1.8 6 1.6
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#11 5000 Knitted underwear ·Tape-
_jj/
shirts. guide
-7
7 Tee shirts
042-5
~
5
~~
Thin, medium taping
Knitted underwear •Tape-
-6
2 4 2.2 6 3.6 0.3--1.8 6 1.6
~~~
#11 5000
~~~
shirts. guide
~
-7
7
Tee shirts
--
045-5
? 5
II
Bulky knit taping
-6
2 4 2.2 6 2.5 0.4--3.6 7 2
#14 5000 Sweater ·Tape-
-U
hi
Cardigan guide
-7
7
Bulky sweater
046-5
AA
5
II
Bulky knit taping
-6
mock 2 4 2.2 6 2.5 0.4--3.6 7 2
#14
5000 Sweater ·Tape-
_jj/
hi
Cardigan
-7
7
Bulky sweater
*Extra cost of attachment will be required for the sub-dass marked with asterisk.
-5-
From the library of: Superior Sewing Machine & Supply LLC

SPECIFICATION
@)BROTHER INDUSTRIES LTD
MA4-B581- / I
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MADE IN JAPAN/
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(a)
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Height Pitch
Differential
Noodle Maxomum
Needle stitch
of
(mm)of
(DCK 1)
sewing
Sub-class Stitch
form
No. of
No. of
gauge Bight length Differential
~rosser
Type of
speed
No. needle thread (mm) (mm)
(mmJ
feed ratio
oot
feed dog feed dog DMx13
(spmJ
Usage (material) Attachment
061-2
2
~~
Thin
-3
? 3 Blouse
2 5 2 3.6 0.3--1.8 4 1.6
I~
#11 5000 -
-4
4 Shirts
-5
5
~ 062-2
2
~~
Thin
-3
7 2 4 2 3
0.3-1.8 1.6 #11 5000 Blouse 3.6 4
I~
-
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-5
5
063-3
3
~~
Thin, medium
-4
7 2 5 3 4 3.6
0.3-1.8
6 1.6
#14
5000 Jumper -
I~
Pajamas
-5
5
Coasts
064-3
3
~~
Thin, medium
-4
?>
2 4 3 4 3.6 0.3--1.8 6 1.6
#14
5000 Jumper -
I~
Pajamas
-5
5 Coats
065-5
5
~~
Medium, heavy
-6
? 2 5 5 6 3.6 0.3--1.8 6 1.6
#16
5000 Working
dress,
-
In
trousers, coats
-7
7 6.5
for women
066-5
5
~~
Medium, heavy
-6
? 2 4 5 6 3.6 0.3--1.8 6 1.6
In
#16
5000 Working
dress,
-
I"- trousers, coats
-7
7 6.5
for women
067-4
,
~~
Thin, medium
2 5 2 4 3.3 0.3--2.7 5 1.6
#14
5000 Blouse •
Ruffler
~
Negligee
*
no
068-4
~
~~
Ruffling
2 4 2 4 3.3 0.3--2.7 5 1.6
#14 5000 Blouse •Ruffler
./!#}'
Negligee
*
no
069-5
,
~~
Thin, medium
2 5 3 5 3.3 0.3--2.7 5 1.6
#14
5000 Coats
for children
·Ruffler
-~iff~
& women
*
no
070-5
,
~~
Ruffling
2 4 3 5 3.3 0.3--2.7 5 1.6
#14
5000 Coats •Ruffler
./tfJ
Blouse
Negligee
* -
no
-6-
From the library of: Superior Sewing Machine & Supply LLC

SPECIFICATION
0 BROTHER INDUSTRIES L TO.
MA4-B581- / I
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MADE IN JAPAN/
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Nndle
Maximum
Neodlo
StitCh
of
(mmlof
Type of
sew•ng
No. of
No. of gauge Bight length Differential presser
(~~=,~)
speed
Sub-class No. Stitch form needle thread (mml (mm) (mml feed ratio
foot
feed dog feed dog (spml Usage (material) Anachment
071-5
~
5
~~0
Medium, heavy
-5
2 5 5 6 3.3 0.3--2.7 5 1.6 #14
5000 Coats
for children •
Ruffler
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&women
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072-6
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Ruffling
2 4 5 6 3.3 0.3--2.7 5 1.6 #14
5000 Coats
for children •
Ruffler
-./@
&women
*
000
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Thin, medium ·Wrapper
Ruffling (w/piping)
2 5 2 4 3.3 0.3--2.7 5 1.6 #14 5000 •
Ruffler
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Blouse ·Tape-
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*
no
074-4
~
~~
Ruffling (w/piping) ·Wrapper
2 4 2 4 3.3 0.3--2.7 5 1.6
#14
5000 Blouse •
Ruffler
.n
Negligee ·Tape-
*
000
winder
075-5
,
~~
Thin, medium •Wrapper
Ruffling (w/piping)
2 5 3 5 3.3 0.3--2.7 5 1.6
#14 500 •
Ruffler
n Coats
for women & ·Tape-
*
000
children winder
076-5
,
~~
Ruffling (w/piping) •Wrapper
2 4 3 5 3.3 0.3--2.7 5 1.6
#14 500 Coats
for women & •
Ruffler
~
-£1 children
·Tap~-
000
winder
* -
077-6
~
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Thin, medium ·Wrapper
Ruffling (w/piping)
2 5 5 6 3.3 0.3--2.7 5 1.6
#14
5000 •Ruffler
H Coats
for women & ·Tape-
gg
children winder
-
(j00
*
078-6
~
~~
Ruffling (w/piping) •Wrapper
2 4 5 6 3.3 0.3--2.7 5 1.6
#14 5000 Coats f.or women & •
Ruffler
-IY children •Tape-
oo
winder
*
[100
079-3
~
3
~~
Thin, medium taping
-4
2 5 2 4 3.6 0.3--1.8 4 1.6 #11 5000 Knitted underwear ·Tape-
-U
I~
Shirts guide
-5
5
Tee shirts, pajamas
080 ...... 3
~
3
~~
Thin, medium taping
-4
2 #11
Knitted underwear ·Tape-
4 2 4 3.6 0.3--1.8 4 1.6
I~
5000
~
Shirts guide
-5
5
Tee shirts, pajamas
-7-
From the library of: Superior Sewing Machine & Supply LLC

SPECIFICATION
~BROTHER INDUSTRIES L TO.
MA4-B581- / I
/
MADE IN JAPAN/
/
/ v
ll
[)j
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ij
[]
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==
~
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(a)
~
+
~
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(b) I
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--
MaKimurT Haight
Pitch
Differential
Needle
Ma~tomum
Needle slltch of
lmml of
Type of
(ocx1
sewong
No. of
No. of
gauge Bight length Differential prosser speed
Sub-class No. Stitch
form
needle thread (mm) (mm)
(mml
feed ratio
foot
feed dog
foeddog
0Mx131 (spm) Usage (material) Anachm"Jnl
081-3
7;~
3
~~
Thin, medium taping
-4
2 5 4 0.3
..... 1.8 1.6
#14
5000 Knitted underwear
·Tape-
3 3.6 6
I~
_IJ
Shirts guide
-5
5
Tee shirts, pajamas
A--~
~~
082-3
t~~~
3
Thin, medium taping
-4
~
2 4 3 4 3.6 0.3
..... 1.8 6 1.6
I~
#14
5000
Knitted underwear
·Tape-
_Jj/
Shirts guide
-5
5
Tee shirts, pajamas
083-5
~~7,
5
~~
Thin, thick taping
-6
#16
Knitted underwear
·Tape-
2 5 5 6 3.6 .0.3
..... 1.8 6 1.6 I
me
5000
-U
Shirts guide
-7
7
Tee shirts, pajamas
084-5
'?
5
~~
Thin, thick taping
-6
2 6 3.6 0.3 ..... 1.8 6 1.6 #16 5000 Knitted
underwear ·Tape-
4 5
In
_IJ
Shirts guide
-7
7
Tee shirts, pajamas
087-5
5
~u
Extra heavy
A-~
Denim
-6
~~~ . 2 5 5 6 3.6 0.3
..... 1.8 3.5 2.5
~80
#21 5000 -
Curtain
*
088-5
5
~~
Extra heavy
-6
7,
2 4 5 6 3.6 0.3
..... 1.8 3.5 2.5 #21 5000 Demim -
In
Curtain
*
089-5
,
~~
Thin, medium binding
2 5 3 5 3.6 0.3 ..... 1.8 6 1.6 #14 5000 Coats
for children
•Binder
_,tf
I~
& women,
·Tape-
knitted good winder
*
--~
~~
090-5
~~"!~
Thin, medium binding
2 4 3 5 3.6 0.3
..... 1.8 6 1.6
#14
5000
Coats for children
•Binder
-riJ
I~
& women,
•Tape-
knitted goods winder
*
092-5
5
~~
Extra heavy
-6
? 2 5 5 6 3.6 0.3
..... 1.8 3.5 2.5 #21 5000 Denim
·Serrated
~~~
Curtain angle
knife
*
093-5
5
IC
Extra heavy
-6
·~
2 4 5 6 3.6 0.3-1.8
3.5 2.5 #21 5000 Den
in
•Serrated
iou
Curtain angle
knife
**
Extra cost of attachment will be required for the sub-class marked with asterisk.
-8-
From the library of: Superior Sewing Machine & Supply LLC

3. DESCRIPTION OF MECHANISM
[j] NEEDLE BAR MECHANISM
®
®-~-"
(j)------/
(@--
@------
CD
• In case that crank shaft 0 may rotate to the direction indicated with arrow, with needle bar and upper knife eccentric
cam 8 ,needle arm driving crank rod 0 connected with crank shaft moves up and down.
• As the upper portion of needle arm driving crank rod Ct is connected with needle arm driving lever 8 with its pin ~,
needle bar crank shaft (t gets the oscillating movement.
• Needle bar clamp • connected needle bar crank shaft (t with needle bar crank shaft (;) and needle bar link is fitted
into the top
of needle bar crank shaft and gets up and down movement.
• Needle bar C) that is held by needle bar clamp fj is guided by needle bar bushing lower CD and needle bar bushing
upper
f).
12J UNDER LOOPER MECHANISM
• In case that crank shaft 0 may rotate to the direc-
tion indicated with arrow, with under looper ec-
centric cam
8, under looper connecting rod C)
moves up and down.
• Under looper 8 fitted into under looper holder (t
gets the oscillating movement with the intermediate
action
of under looper connecting lever 8 connected
with under looper connecting rod
Ct and under
looper lever shaft
•.
-9-
13] OVER LOOPER MECHANISM
®
@---
-CD
~@
~®
-----@)
-®
L _____ ____,
• In case that crank shaft 0 may rotate to the direc-
tion indicated with arrow, with over looper eccentric
cam
8, over looper connecting rod Ct moves up
and down.
• Over looper driving lever
(t gets the oscillating move-
ment with the intermediate action
of over looper
connecting lever 8 connected with over looper con-
necting rod C) and over looper lever shaft
•.
• Its oscillation motion makes the over looper "'
describe an ideal orbit about over looper holder (;)
and over looper holder guide assembly CD via over
looper holder pin
fj.
From the library of: Superior Sewing Machine & Supply LLC

~ DOUBLE CHAIN STITCH LOOPER MECHANISM
1) Double chain stitch looper back and forth movement mechanism
• In case that crank shaft 0 may rotate to the direction indicated with arrow, with longitudinal eccentric cam 8,
longitudinal feed driving rod • moves up and down.
• Longitudinal feed lever slide borck • with longitudinal feed lever e is fitted into the top end of longitudinal feed
driving rod • and gets back and forth movement making longitudinal feed lever shaft •
as a fulcrum.
• Longitudinal feed lever slide block • connected between thrust collar (;) upon longitudinal feed shaft fj and set
collar • ' it carrys to double chain stitch looper m
with the intermediate action of longitudinal feed shaft • and
double chain stitch looper holder
(0 .
2) Double chain stitch oscillating mechanism
• Chain stitch driving lever ~ is conveyed the oscillating motion by under looper connecting lever 41 with the
intermediate action
of under looper connecting lever pin f) , chain stitch link 41 and chain stitch driving lever pin
••
• Its oscillation motion is conveyed to longitudinal feed shaft fj, double chain stitch looper holder C) and double
chain stitch looper m.
~ KNIVES MECHANISM
1) Upper knife mechanism
· In case that crank shaft 0 may rotate to the direction indicated with arrow, with needle bar and upper knife eccentric
cam
8, upper knife driving rod • moves up and down.
-10-
From the library of: Superior Sewing Machine & Supply LLC

• The top end of upper knife driving rod 8 is connected with upper knife driving lever 8 with pin 8, then upper
knife driving lever e gets oscillating movement.
• Upper knife tD is connected upper knife holder 8, gets oscillating movement with the intermediate action of upper
knife driving lever 8 and upper knife driving arm (3.
2) Lower knife mechanism
• Lower knife CD is fixed with lower knife holder f) and being pushed to upper knife tD with the pressure of lower
knife holder spring
fD plays a role of edge trimming with upper knife tD. And lower knife holder guide fB
plays role of positioning of lower knife CD and guide of lower knife holder f).
12J FEED MECHANISM
@ •. ~:v'
@) ~ I :
: --- ®
(j)- ®
1) Horizontal feed mechanism
@
@)
®
®
@
• In case that crank shaft 0 may rotate to the direction indicated with arrow, with under looper eccentric cam 8,
feed rod e connected with under looper eccentric cam • ' gets back and forth movement.
• The top end of feed rod 8 is connected with feed arm 4D with pin C) thus feed arm makes oscillating movement.
• Feed arm CD is fitted with feed shaft 69, so that main feed arm fj and differential feed arm (t get oscillating
movements because these two arms are fitted with feed shaft
69.
• This oscillating movement becomes horizontal movement of main feed bar fD and differential feed bar CD> with
the movements
of main feed link CD and differential feed link tD.
2) Vertical feed mechanism
• The part being fitted with crank shaft 0 is eccentric, so that part @ of feed lifting slide block f) , main feed bar
4) and differential feed bar f) get vertical movements.
3) Stitch length regulator and differential feed mechanism
• As for the adjustment stitch length, loosen nut ell and adjust the scale on indicator plate CD in accordance with
the scale on main feed arm
fj and then retighten nut Cl).
• The differential ratio can be adjusted by changing the scale on differential feed arm (t against the scale on main
feed arm
fj.
• In case of shrink feed, set the scale on differential feed arm (t to a larger number than that of the scale on main
feed arm
8.
• In case of stretch feed, set the scale on differential feed arm (t to a smaller number than that of the scale on main
feed arm
fj.
- 11-
\ .. _. __
From the library of: Superior Sewing Machine & Supply LLC

~
iZJ PRESSER FOOT MECHANISM
• In case that presser foot lifter lever 0 is depressed down, presser foot supporter 0 is lowered with spring hook 8.
• Main presser arm connected with pin 8 is raised with presser foot supporter •.
• If presser bar lifter 8 is depressed down as per above figure, presser bar lever 8, presser arm roller shaft f) and presser
arm roller
fD are raised with roller fD knocked into presser bar lever as a fulcrum presser bar lever shaft t), thus main
presser arm
CD is released from the pressure of presser bar spring e.
4. DISASSEMBLING PROCEDURES
[I] COVER
\\
~
bill
®
DCX I
®
CXI3
Procedures
Q'ty of
Turn the pulley until the needle bar is raised to
the highest position, and then turn out presser
foot 0 above needle plate.
screw
2 Remove needles
8. 2
3 Remove cloth plate • . 2
4 Remove cloth guide (L)
8. 2
-12-
®
®
Q'ty of
screw
5 Open feed mechanism cover (B) CD and remove
feed mechanism cover
(t. 4
6 Remove front cover guide fj. 2
7 Remove front cover
@). 2
8 Remove front cover supporter
Ci). 2
From the library of: Superior Sewing Machine & Supply LLC

!2] PRESSER FOOT AND FEED MECHANISM
Procedures
Q'ty of
screw
Remove presser foot 0 .
(In case of safety stitch, after pull out pin 8,
remove presser foot 0 .)
2 Turn the pulley until the needle bar is raised to
the highest position.
131 KNIVES MECHANISM
1
Q'ty
of
screw
3 Remove needle plate 0 . 2
4 Remove differential feed dog 8.
5 Turn the pulley until the under looper to the left
mostly and remove main feed dog
t).
6 Remove chain feed dog. (0
®
~-- ... ~.
uu--(j) ~
~f.:.#---@
~Wr.;..ll...\'01
-- ®
• Q'ty of
Procedures screw
Loosen screw 0 and
turn lower knife holder 8
Q'ty of
screw
6 Remove lower knife holder guide e. 2
·~ - ..
to the left direction, then tighten it.
2 Remove upper knife 8.
7 Remove lower knife holder 8 as holding it by ~
hand. (Pull out spring for lower knife holder 1
3 Remove upper knife holder C) .
4 Remove nut 8.
5 Remove lower knife t) as holding it by hand.
-13-
8 also.)
8 Remove lower knife holder. supporter
~. 2
(At first loosen bolt Q) under the needle plate
support bracket
CD> .)
From the library of: Superior Sewing Machine & Supply LLC

~ UNDER LOOPER MECHANISM
Q'ty of
Procedures screw
Turn the pulley until under looper 8 to the
left mostly, and the remove movable needle 2
guard 8.
2 Set under looper 8 at the center position in
~ the operation range, and then remove under 1
looper 8.
~ OVER LOOPER MECHANISM
Procedures
Remove inside cover 0 .
(Set over looper 8 to the left mostly.)
2 Remove over looper 8.
Q'ty of
screw
2
®
G)
-14-
Procedures
3 Remove looper thread take up (L) @).
4 Remove under looper holder 8.
Q'ty of
screw
5 Remove over looper thread take-up (R) @) and
under looper thread take-up (R) (D
6 Remove under looper thread guide 8.
Q'ty of
Procedures screw
3 Remove over looper driving lever @) and over
looper holder guide assembly 8 at the same
time.
1·3
From the library of: Superior Sewing Machine & Supply LLC

12] DOUBLE CHAIN STITCH LOOPER MECHANISM
Procedures
1 Remove needle guard (B) 0 .
Q'ty of
screw
1
2 Remove needle guard (F) 8 from needle guide
(B) 0. 1
3 Remove double chain stitch-looper O. 1
4 Remove double chain stitch looper holder 8. 1
5 Remove thread guide (R) {it and (L) 8. 1
7 NEEDLE BAR MECHANISM
Procedures
1 Remove needle thread take-up 0 .
2 Remove needle thread guide (A) 8.
@
®
3 Remove needle thread take-up supporter t) .
Q'ty of
screw
1
1
1
4 Remove chain stitch needle thread guide 8
(B581).
5 Remove face plate 8.
4
(Stopper spring
{it is naturally to be removed
out.) 3(B581)
-15-
Procedures
Q'ty of
screw
6 Remove thread handler
fj. 1
7 Remove thread take-up bracket ~. 2
(Put screw driver into the hole
of double chain
stitch looper take-up and loosen set screw.)
8 Remove double chain stitch looper take-up t). 2
®
®
Procedures Q'ty of
screw
6 Remove needle mechanism cover 8, taking care
not to spoil the packing. 7 ~
(Put feed mechanism cover «;> on the machine
body.)
7 Loosen screw for needle bar clamp fj and pull-
out needle bar~ lower.
From the library of: Superior Sewing Machine & Supply LLC

5. ASSEMBLING ADJUSTMENT PROCEDURES
[]] NEEDLE BAR MECHANISM
~
@) (B571)
@
Procedures
1 Insert needle bar 0 into needle bar clamp 8 .
2 Turn the pulley until the needle bar clamp 8 is raised to the highest position, and then temporarily
fasten the needle bar 0 at a height where the needle clamp 0 is barely hidden in needle bar bushing
lower e.
3 Install face plate 8 to the machine body.
(Install stopper spring
.. at the same time, and adjust it when face plate cover 8 is closed without
cranky.)
4 Install needle mechanism cover 8 to the machine body firmly putting of face plate CD lightly, then
take care not make any clearance.
5 Install needle thread take-up supporter 0 to needle bar clamp 8.
6 Install needle thread guide (A) 0) to face plate 8.
7 Install needle thread take-up f.D) to needle thread
take-up supporter 0 .
• Normally, it should be fastened in the center of its
adjustable range.
,-...... Lower its position to increase the needle thread ten-
sion.
Raise its position to decrease the needle thread ten-
sion.
ISafety Stitch I Install chain stitch thread guide m to
face plate CD.
• Normally, it should be fastened in the center of its
adjustable range.
Raise its position if the needle thread winds itself
around the looper.
Also raise its position to increase the needle thread
tension.
Lower its position to decrease the needle thread ten-
sion.
Q'ty of
screw
-16-
Q'ty of screw
4
3 (B581)
7
From the library of: Superior Sewing Machine & Supply LLC

Procedures
8 Insert needles all the way into needle clamp 0 and
tighten screws.
9 Install needle plate
~ .
10 Check part ® on the over looper driving lever and see
whether the machine
is for standard use (S) or high-lift
use (H).
11 Standard needle for adjustment is as follows.
• In case of the twin-needle, use the left needle.
• In case of the safety stitch, use the hemming needle.
Ill The below items of f) and\Safety Stitch\ should be
taken simultaneously.
12 In case
of sewing machines made to the standard
specifications, adjust the distance between the needle
point and the
top of needle plate to 11 mm when
the needle
is up highest. The sewing machines of the
high-lift specifications must be adjusted
to a distance
of 11.5mm between them.
ISafety Stitch I Turn the pulley slowly, lower needle
slightly into needle plate and adjust it
so needles will be in the center of needle
plate slot,
by turning needle bar.
13 In case
of the single needle, tighten needle bar clamp
with screw.
In case
of the twin-needle, temporarily fasten needle
bar clamp with screw.
In case
of the safety stitch; after make sure needle
should be in the center
of needle plate slot, tighten
needle bar clamp with screw.
Q'ty of
screw
2
-17-
Safety stitch (B581)
From the library of: Superior Sewing Machine & Supply LLC

~ UNDER LOOPER MECHANISM
CD
Procedures
I Remove needles and needle plate.
2 Temporarily fasten under looper holder 0
on under
looper lever shaft 8 .
3 Insert under looper 0 all the way into under looper
holder
O.
4 Measure under looper 8 tilt at its point and bottom,
adjust it until the measurement difference is in the
range of 1 to 1.5 mm, and then fasten under looper 8
with screw (D.
5 Install the standard needle for adjustment into needle
clamp.
Ill The below items of 8 and fj should be taken
simultaneously.
6 In case
of sewing machines made to the standard
specifications, adjust the distance between the under
looper point and the needle center to 4.5
mm when the
under looper
is at the left most position. The sewing
machine
of the high-lift specifications must be adjusted
to a distance of 2.2mm between them. (Sidewise
positioning)
ISafety Stitch I In case of standard specifications, that
distance is 4.7mm.
In case of high-lift specifications, that
distance is 2.2mm.
7 With the point of under looper in line with the center
of needle, make an adjustment so that the point of
under looper will push needle 0.01 "'0.05mm {i.e.,
slightly contact needle) in the upward travel
of needle.
However, in case
of sewing for thick materials, must be
adjusted to
touch about 0 to 0.05mm between them.
(Longitudinal positioning)
* 0.05 to 0.07mm for cotton fabrics; 0.08 to O.l·mm
for chemical fabrics.
ITwin Needles I Iqstall the right needle into needle clamp,
loosen screw for needle bar clamp,
turn
the needle bar until the under looper
point hits
both needles by approximately
the same
depth or the right needle slightly
deeper, and
then retighten screw for
needle bar clamp. Also check the height
of needle bar at the same time.
Q'ty of
screw
(See the figure at right.) -
18-
Scale
slightly contact needle
From the library of: Superior Sewing Machine & Supply LLC