Sii
E •
~
.:II
~~-'./
PARTS
JW-SBLC-20 JW-28BLC-20
JW-SBLC-20-BTFL
JW-SBLC-30
JW-SBLC-30-BT
JW-SBLC-30-BTFL
JW-8BLC-30R-BTFL JW-28BLC-30R-BTFL
THREAD TRIMMER
AUTOMATIC REVERSE FEED
1)
~"
LIST
JW-28BLC-20-BT
JW-28BLC-20-FL
JW-28BLC-20R
JW-28BLC-20R-BT
JW-28BLC-20R-FL
JW-28BLC-20R-BTFL
JW-28BLC-30
JW-28BLC-30-BTFL
AUTOMATIC FOOT LIFTER
CLOTH PULLER
• SEIKO SEWING MACHINE CO.,
LTD.
*'
\-'Y'JA.HiJw~:,.,:,0)*-1;7JLJ,
JW-8BL-2G-1/JW-28BL-20-1/JW-8BL-30-1/JW-28BL-3G-1
~;h,
""(t;)LJ*"t
JW-28BL -20-1 I JW-8BL
o
1/t~
'*L
""C,
*J\-'Y1JA.~~;:"~Jffl~:h..~tl~l;t,
-30-1
'\·;.~??·;.~?,
I JW-28BL -3G-1
~JJ.Jtfl!~..t.lf,
(/)I
\-'Y1JA.~~Fals:tl::;:"f!Jffl(t;:~~
:1-7-*IMm-c:-t o
t;.O)~il$~1;t~~
JW-8BL
-20-11
'o
This is
mechanism of JW machines. Common parts are indicated on
JW-8BL-20-1/JW-28BL-2G-1/JW-8BL-30-1IJW-28BL-3G-1. Refer
parts list of JW-8BL
together when you use this parts list.
the
parts list for thread trimmer, auto back tack, auto foot lift, cloth puller
the
parts list
-2o-1
I JW-28BL
-20-1
I JW-SBL
-30-1
I JW-28BL
to
the
-30-1
of
t.rx
±
HOOK
t.r-x
±
HOOK
-EJ-
< ;tJ)
..
trx
SADDLE (RIGHT), HOOK
-EJ-
<
'-i: ) ..
tr-x
SADDLE (LEFT),
HOOK
§~
CONTENTS
I.
I
.0
••••
e
I I I
••
Ill
I I
Page
••••
e.
I'
• • e e e • e e e I I I I o I I I I I I I I 1 f 2
I.
I I I I
I.
I I I I I I . I I I I I I t I I I I I
I.
3,
4
*i;JJLJ'Jv/1'F,;£.A??:..-?
THREAD
'Y31':..-~
JOINT, JOINT CONNECTING
:f-1)-,
MACHINE
~+1&
THROAT PLATE,
I
\·/?1l·/?ffiH~
AUTOMATIC
13iJ.Jtffl;tl:.lfmif~
AUTOMATIC FOOT LIFTER
Cl-'5-(l'),
ROLLER
Cl-?-(1:.),
ROLLER
TRIMMER
..
'Y31':..-~~
~~
PULLEY,
..
fqij;&
REVERSE
KNIFE,
..
IDIJ.::F-1&
THREAD TAKE-UP
BED
SLIDE
FEED
0-7-~LJ*'IJ,
(LOWER),
ROLLER
7-.L.O-?--Ei'
(UPPER), ROLLER BASE
DRIVING
ROD
MECHANISM
FEED
.. · ..
· · · · · · · · · ·
KNIFE
CRANK
1111.1.1111
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LEVER.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TENSION
e I I I
....
· · · · · · · · · · · · ·
I.
I I I I I e 1 I e I I I e I I I I I I e I I
..
BRACKET
· · · · ·
9,
11
5,
7,
, 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13, 14
MECHANISM
. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15, 16
?'5•/=f-· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 17, 18
SHAFT,
FEED
CLUTCH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19, 20
6
8
10
7-.L.a-?--El'
ROLLER
7-.1'·/=f,
SWITCH,
~J±M1*1
AIR
~J±Mi*2
AIR
fg-~~1
BASE, PULLER CYLINDER
:::::J-F
CABLE
PRESSURE
PRESSURE
..
"1-?-~'J:..-;r
..
_ · ·· · · ·· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MECHANISM 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27. 28
MECHANISM 2
I I I I I I I I I I
I.
I O I
I.
I e I O O I I O O
ACCESSORIES 1
f;j-~~2
IIIIIIIIIIIIO
1110e
• o I I I e o
ACCESSORIES 2
~ •<>
'/
TABLE
::~:.
-
':/;:r..~
OF
GAUGE
PARTS
0
O I I I O O I
lo
oeooeeO
01
I I I 2
OIIOI
21.22
23
, 24
25 26
11
30
• 2
n-x
±.g. (1:1)
HOOK
16~
--~-,
SADDLE (RIGHT), HOOK
"nx
17
43
37
__
/
_
38~
39
-1-
:t.r'<'
±it
(
15)
..
:t.r'<'
HOOK SADDLE (RIGHT), HOOK
f§B~~~
No.
PARTS
1
70762
31092
2
70763
3
4
70764
5 70765
6 70782
7 27174
70784
8
9 70783
10 70780
11
70781
12
2067
13
70779
14
70777
15
70778
16
70769
17 70770
18
70773
19
11176
70761
20
21
27174
22 70760
23 70758
24
70756
25 11176
26
70757
27
27170
28
10559
29
90625
30 70774
31
27171
32 70775
33 70144
34 10646
35
10647
36 70772
37
15092
38 70776
15007
39
40
15093
41
15094
42 10629
43
70516
44 70770-01
45
70770-02
46
70140-3A
47
70140-3B
16407- 04
48
49
70104-05
50
70140-06
51
70140- 10
70140-11
52
53
70140-12
54 70140- 19
0
N
I
0
No.
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* *
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~:I:
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:b.
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THREAD RETAINING PIN BRACKET
SCREW
THREAD RETAINING PIN
SCREW
THREAD RETAINING PIN SPRING
FIXED KNIFE BRACKET (LOWER)
SCREW
FIXED KNIFE BRACKET SPRING
FIXED KNIFE BRACKET PIN
FIXED KNIFE BRACKET (MIDDLE)
PINCH SCREW 9/ 64 X 40 L=8
SCREW
FIXED KNIFE BRACKET (UPPER)
FIXED KNIFE
SCREW
BOBBIN
HOOK COMPLETE
HOOK BUSHING (UPPER)
SCREW
DRIVING KNIFE
SCREW
DRIVING KNIFE SHAFT
DRIVING KNIFE SHAFT BUSHING (UPPER)
DRNING KNIFE SHAFT BUSHING (LOWER)
SCREW
DRIVING KNIFE SHAFT COLLAR
SCREW
SCREW
WASHER
BOBBIN CASE OPENER LEVER HINGE P
SCREW
OIL RESERVOIR SPACER
SCREW
SCREW
WASHER
HOOK SADDLE (RIGHT)
HOOK SADDLE GASKET
OIL RESERVOIR (RIGHT)
SCREW
OIL REGULATING DIAL
0- RI
SCREW
MACHINE SUPPORTING
HOOK
BOBBIN CASE
HOOK GIB (A)
HOOK GIS (B)
SCREW
NEEDLE GUARD
SCREW
BOBBIN CASE TENSION SPRING
SCREW
BOBBIN CASE TENSION REGULATING SCREW
FELT
M4 x 0.7 L=12
11
M4 x 0.7
7/ 32 x
6.75 x
9/ 64 x 40 L= 1 0
NG
DESCRIPTION
/ 64X40
L=l
0
11
/ 64 X 40 L=6
1/ 8 X 44 L=5.2
7/ 32 X 32 L=5.5
M4X0.7
7/ 32 X 32 L=5.5
M5 X 0.8 L=6
M4.5 X
M5 X 0.8 L=10
1/8
L=10
32
L=8
32
L=21
24
L=28
X 40 L=8
rN
BOLT
-2-
:h
-x
±.g.
HOOK SADDLE (LEFT), HOOK
Cli:)
..
:tr~
17
1---
ClD
4~
~36
---------37
39
HOOK
SADDLE
(LEFT),
HOOK
ml~il~
No.
PARTS
1
70762
31092
2
70763
3
4
70764
5 70765
6 70782
7
27174
8 70784
9 70783
10 70780
11
70781
12
2067
13
70779
14 70777 -
15
70778
16
70769
17
70770
18
70773
19
11176
20 70761
21
27174
70760 -
22
70758
23
24
70756
25 11176
70757
26
27
27170
28
10559
29
90625
30 70774
31
27171 -
32 70906
32 70984 -
33
10524-G
34
70907 -
35 28031 -
70905 -
36
36 70983
37
15092
38 15521
39
15007 -
40 15093
41
15094
42 10629
43
70770-01
70770-02
44
45
70140-3A
70140-38
46
47
16407-04
48
70104-05
49
70140-06
70140-10
50
70140-11
51
70140-12
52
70140-19
53
No.
0
0 N
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A
B
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-
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THREAD RETAINING PIN BRACKET
SCREW
THREAD RETAINING PIN
SCREW
THREAD RETAINING PIN SPRING
FIXED KNIFE BRACKET (LOWER)
SCREW
FIXED KNIFE BRACKET SPRING
FIXED KNIFE BRACKET
FIXED KNIFE BRACKET (MIDDLE)
PINCH SCREW
SCREW
FIXED KNIFE BRACKET (UPPER)
FIXED KNIFE
SCREW
BOBBIN
HOOK COMPLETE
HOOK BUSHING (UPPER)
SCREW
DRIVING KNIFE
SCREW
DRIVING KNIFE
DRIVING KNIFE
DRIVING KNIFE
SCREW
DRIVING KNIFE SHAFT COLLAR
SCREW
SCREW
WASHER
BOBBIN CASE OPENER LEVER HINGE PIN
SCREW
/ 4")
HOOK SADDLE
HOOK SADDLE SHAFT
SCREW 6.
HOOK SADDLE SHAFT BRA.CKET
SCREW
HOOK SADDLE (LEFT) {
HOOK SADDLE
HOOK SADDLE GASKET
OIL RESERVOIR (LEFT)
SCREW 9/ 64 x
OIL REGULATING
0-RING
SCREW
HOOK
BOBBIN
HOOK
HOOK
SCREW
NEEDLE GU
SCREW
BOBS
SCREW
BOB
FELT
M4X0.7
11
M4X0.7
7/32
M5 X 0.8 L=6
4.5 X 32 L=8
CASE
GlB
Glo
C
B
CASE
DESCRIPTION
L=12
/ 64X40
L=10
9/ 64 X 40 L=8
11/64
X 40 L=6
1/8 X 44
M4X0
7/ 32 X 32 L=5.5
M5X0
75
M6
1/ 8 X
ASE
L=5.2
X 32 L=5.5
.7 L=10
SHAFT
SHAFT
SHAFT
.8 L=10
SHAFT
x 24 L=6.5
X 1
L=14
(LEFT ) (2" -2- 3/8-)
40
L= I 0
DIAL
;!
Q
L=S
(A)
(B
ARD
TE
PIN
BUSHING (UPPER)
BUSHING (LOWER)
(
-1-3
/ 4")
(2"
-2-3/8")
-J-3/4
::J
=
n)
~
--
I
-
*~~J/v/1~',
;J.A.'J7":/'J
THREAD
TRIMMER
14
KNIFE,
DRIVING
KNIFE
CRANK
3~
6
27
~
-5-
~20
lfttJ.JLJ'Jv/1'~'
..
;J."A'J7':/'J
THREAD
$~iiiS-
No.
PARTS
1 30102
2
30122
37713
3
6031-01
4
30105
5
6 30124
7
70742
8
30068
9 13076-01
10
38158
11
50409
12
70737
13
35034
14
70754
15
70739
16
70741
17
70740
18
4070
19
38149
20
70745
21
70746
10636
22
23
70747
70748
24
25
13076-01
26
70749
27
70738
10571-G
28
29
70743
30
18065
31
27186
32
70744
33
30075
34
30078
TRIMMER
0 0
N
No.
0
N
0
_J
co
co
*
I
I
0
_J
co
co
N
I I I
I
* * *
0
C'?
0
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co
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* * * *
*
*
* * * *
* *
* *
*
*
*
*
*
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*
*
*
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* * *
* *
* *
*
*
*
* *
*
*
*
* * *
*
*
* * *
* *
*
* *
* *
*
*
*
*
* *
* *
* *
*
* *
*
* *
* *
* *
* *
*
*
KNIFE,
C'?
I
I
0
_J
co
co
N
* *
*
*
* *
* *
* *
*
*
*
*
*
*
* *
*
*
*
* *
* *
*
*
*
*
*
*
*
*
*
*
* *
*
*
* *
*
*
*
*
* *
*
*
*
*
DRIVING
~~
QTY
ttt;JJL)'Jv/1'H24V)
1
ttt;JJ
LJ
4
1
2
1
2
1
1
1
1
1
1
2
2
1
1
1
2
1
1
1
1
1
1
1
1
1
2
1
4
4
1
2
2
'Jv
ttt;JJLJ'Jv/1j.:'~:lE:t&
ttt;JJLJ
'Jv
:17:..-~-'1'-t":..-
:17:..-~-'(1-t":..-ltd)t&ft
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fl7t.
tJj
t;JJ~;tt.&~td.L.
t;J]fl;t#it":..-td.L.
t;J]fl;t#it::..-td.L.-T·/
ttt;JJL)')v/1j.:'-2l'
!f-t;JJLJ
'Jv
ttt.JJ
LJ
'Jv
/-.A'/7:..-?
I-.A?7:..-?.A:1•J:..-'f
f..A?7:..-?*HJ
1-.A'/7:..-?
I-.A?7:..-?'Jt.J
f..A?7:..-?~L.A:1
1-.A'/7:..-?~L.A
i.A?7:..-?~L.A:1•J>?''f!t7·/l--
f..A'/7:..-?I:l-7f..A?7:..-?I:l-7-td.L.
f..A?7:..-?I:l-7-td.L.-T·/I--
I-.A?7:..-?I:l-7-td.L.'J~:---'I'-
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I-.A?7:..-?.AI--•/J\I-.A?7:..-?.AI--'/J\-ltd)td.t.
1-.A'/7"./.?.A
KNIFE
/
1'j.:'lb~')td.L.
/
1'j.:'~:lEf<d)td.t.
~~
td.
L.
7-·/1--
/ 1'j.:'-2i'ltd)td.L.
/ 1'i-=-2l'ltd:>.A
ltd:>td.L.
\•/.:t-:..-
:t•J
l--·/1
CRANK
~16
1--
:t•J
:..--~·?·/:---'1'-
1
J:..-'f
:..-'11#
\-ltd)td.C:.'J·/:---'1'-
THREAD TRIMMER SOLENOID (24V)
SCREW
THREAD TRIMMER SOLENOID BASE
SCREW
PIN
RETAINING
DRIVING KNIFE CRANK CONNECTING LEVER
HINGE
NUT
SCREW
NUT
DRIVING KNIFE CRANK
SCREW
SPRING WASHER
DRIVING KNIFE CRANK
DRIVING KNIFE CRANK SPRING
DRIVING
SCREW
PACKING
SPRING
SCREW
NUT
DRIVING KNIFE CRANK ROLLER
SCREW
NUT
WASHER
THREAD TRIMMER CAM
SCREW
DRIVING KNIFE CRANK GUIDE
SCREW
WASHER (M5)
DRIVING KNIFE CRANK STOPPER
SCREW
WASHER
M3 X0.5 L=6
11/64
RING
SCREW
15/64X28
M6
X 1 L=20
KNIFE CRANK SHAFT
M5
X0.8
STUD
7/32X32
6.
75
X 24 L=20
M5
x 0.8 L=14
M4 x 0.7
DESCRIPTION
X 40 L=8.3
FRAME
L=5
L=8
-6-
~31'JI--
JOINT, JOINT
~--
'
:/
31':,
. CONNECTING
"4-.:£
~
ROD
19
20~
~
~17
18
16
12
.·
14
-7-
~31':,ti--
..
~31':,t!--~
JOINT,
No.
1 70751
2
3
4
5 70752
5 70922
6 11412
7
8
9
10
11
12
13
14
14
14
14
15
16
17
18
19
20
21
22
JOINT
fffl~ii~
PARTS
70753
11412
70754
70755
28076
70751
70753
11412
70754
70918
70917-A
70917-8
70917-C
70917-D -
70915
70916
70914
70753
11412
70754
70913
28076
No
CONNECTING
0
N
0
N
I
0
0
...J
co
co
I I
*
*
*
* * *
* *
-
* * *
* * *
* * *
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-
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-
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-
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0
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co
co
co
N
co
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*
-
*
* -*
-
*
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*
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*
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*
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*
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*
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*
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*
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*
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0
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co
co
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*
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*
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*
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*
~:M
QTY
ROD
~:g
.Y3-(:,.,-f-.
2
:;3-(
:,.,-j..;td.
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1'
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t.:
(=/:i)
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t:p)
L.)
~td.C
2
:;3-(:,.,-j..-j-·;;1--
2
'Y3-(:,.,-f-.:fd.t.:~~~:,.,-~?~~~-
2
:;3-(:,.,-f-.f*
1
:;3-(:,.,-f-.f*(1-3/4"
1
'Y34:,.,-f-.-j-·;;t-
2
.,c~tmt::{)1f;
1
.,c~tmt::~-a;
1
:;3-(:,.,-f-.
1
:;3-(:,.,-t-:fd.t.:
1
'Y3-(:,.,-t--j-·;;t-
3
'Y34:,.,-t-:fd.C~~~:,.,-~?~~~-
1
'Y3-(:,.,-t-:fd.t.:
1
:;3-(:,.,-t-Jl*6
1
~3-(:,.,-f-.ii*6
1
:;3-(
1
:;3-(:,.,-j.-],1*6 ( :{l)
1
'Y31':,.,-t-:fd.L. C
1
.Y3-(:,.,-f--j-·;;
2
:;3
1
'Y34:,.,-t-;td.C
1
'Y3-(:,.,-f--j-·;;t-
1
'Y3-(:,.,-t-;td.t.:~~~:,.,-~?~~~-
1
.,c~.wt.::~
1
.,c~*filt.::~
1
JOINT
SCREW
NUT
SPRING WASHER
JOINT CONNECTING
JOINT CONNECTING
NUT
DRIVING KNIFE ARM (RIGHT)
PINCH
JOINT
SCREW
NUT
SPRING WASHER
SCREW
DRIVING KNIFE SHAFT CONNECTING ROD
DRIVING KNIFE SHAFT CONNECTING ROD (SHORT)
DRIVING KNIFE SHAFT CONNECTING ROD (MIDDLE)
DRIVING KNIFE SHAFT CONNECTING ROD (LONG)
SCREW
NUT
JOINT
SCREW
NUT
SPRING WASHER
DRIVING KNIFE ARM (LEFT)
PINCH SCREW
M6X1
SCREW
M6Xl
M6X1
M6X1
M6X1
M6
X 1 L=18
L=50.0
L=50.0 (LEFT -HANDED SCREW)
M6X
DESCRIPTION
ROD
ROD
(1-3/4"
1 L=18
-2-1/4")
-8-
-:/-IJ-
MACHINE PULLEY, THREAD TAKE-UP LEVER, TENSION BRACKET
..
::Rff
..
gWJ-T-1&
20
5
6
8
-9-
14