Mitsubishi LZ-720, LZ-780, LZ-790 User Manual

MITSUBISHI
Industrial Sewing

Model

LZ-720
LZ-780
LZ-790

1..

2.*

3.

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1111

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Machine Parts Catalog

INDEX

[i)

f;f.

1f.

if.

w.

fl

~

~

1*-

f~

f;f.

Total assembly
Arm bed

Thread
Upper shaft
Thread take-up lever
Zig

Presser bar

Reverse sewing mechanism ....................................................................................... .. ·····•·· ·

Feed rocking mechanism .. ·· ........ · · ..... · .. · · · .. · · · .. · · · ... · · · · · · · · · · ... · .. · .. · .. · · · ·

Lower shaft

Rotating hook mechanism .....

Oil

Accessories box· .................................. · ....... ··· ................ . ··· ...

Accessories·· ......................................................................................................................... ..

& its accessori

take-up

-zag motion mechanism····················································································· ······ •···••· ·· ··1 1

lubrication mechanism· ...... · .......... ... ···· ........................ ··

~

mechanism······ ......... ······················································· .. ·······················•····· " ···

li

fting mechani

&

st

es

· · ··· ·· ·

··

··· ..... · · · · · · · · · · · ··· · · ·

ovre

mec

han

ism·· ....... ······ ..... ······ .... ···

& needle bar rocking mechanism ... ·····•······ ............ ·················· · • ······· · 9

sm

............ .................. ................................................. .... ·······••··· ··

itch regulator mechanism ... .............................................................

....

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

··

· · ·· · · · · ·· · ·· · ··· · · ··· ·
..

············· ..... · ........... ······· .. ···· · ········ ··· ·· · · 5

··

· · · · · · ·· ··· · ·· ·

..

· · · .... · · · · · .... · · .... · ..... · ........... .. 25

..

· ........... · ..... ·

..

· ..... ·

.. · ..

Page

··

· · · · · · · · ··•••·· · ······ ·· 1

..

19

·· ·23

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

...........

..

· .... ·· ...... · ....

............... ·· ..... ............ · ... 37

....

···

· ...... ...

.. 27

31
33

J9

7

PURCHAS

ING

DfP

T.

P-

100A

198010

'"

--~

TOTAL

ASSEMBLY

LZ-720 ·

780 · 790

*1*001~

ARM

BED & ITS

ACCESSORIES

- 1-

LZ-720 ·

780 · 790

(32)1---

32~----_..,

21

20

6

~:

-

------

--------

--------~

*1*n!H~

'----

ARM

--=g

-

- 2 -5 -

-

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BED & ITS

Fig.
No.

2

3

4

- 5

=---..:M:=T 70A<D

- 6­7

8

10

11

12
13
14
15
16

17 M9
18

19
20
21

22
23
24

26
27

28

29

30
31

001

32

:m

£

Parts. No.

MT

70AO 691

MT

70AO

M9

111 7 oo""-=-2---=s'"""

MT

70AO

MF

20AO

M9

1900

M9

~-----:

~_

- MT 70E1

0881

M

:-::::-

T

-::

7=oA2

MT

70A 1

MT

70AO

MT

80AO

M9

1113

M9

1117

M9

0621

MT

40AO

M9

0922
0401

M9

0409

MT

60AO

M9

0903

MF

30AO

MT

40AO 7

MT

70A3

M9

0880

"M9T1 10

MT

40AO

MT

40AO

MT

40AO 101

MT

60AO 101

MT

70AO 101

M900M~

MT

70AO

MT

40AO

M9

0915

:::1

- r

600
880

691
135

080
080

691
742
844
844
003

002

053

150

002
053
050

477
002
478

42
691
080

002
500

788

192

470

470

011

ACCESSORIES

Ref.

No.

W231704H01
W231703H01

50384"-H01

W343993H01

W34399ZH0

p

674006X01

W50137LH01
W502944H01

W484230H01
W484228H01
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W468706H01
W464016H0

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W468805H01
W48341 ?He;­W501320H01

W50029Th0
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W446404H01
W44640SH01
W475455H01

W483476H01

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(iloi.llf) Gasket 1 0 0 0

(LZ-720) Feed length indicating plate 1 0 I I
(LZ-780)(LZ-790) Feed length indicating plate 1 0 0 t I

11/64(40)x4
11/64(40)x13
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(

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tor

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Arm side cover 1 0 0 0 I

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Gasket for·side·
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check window 1 0 0 0 t I I r

Rubber plug
Rubber plug

Cover plate 1 0 0 0 I I

Screw11
Screw 11/

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Spring washer - 1

St

oper

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9164'-(4-,0~)-x~s-=.5------------~,-

Stopper 1 0 0 0
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11

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top

cover _

13 13

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LZ-720 ·

780

· 790

-3-

*i*mli~

ARM

BED & ITS

ACCESSORIES

LZ-720 ·

780 · 790

*1*"-n*

ARM BED & I

F~g

No

36
37
38
39
40

902

41
42
43
44
45

903

46
47

48

49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65

1\.!f..:J-1'

Pans

No

MF

20AO 181
MF 10A1
M9

1101
MF

10A1
MF 10A1
MF

10EO
M9

1116
MF 36A1
M9

1108
MF

10AO

M9

1501
MF 71EO
M9

1608

MT

SOAO
MT

60AO
MT

70AO

MT

70AO
MT

70A4
M9

0228
MT

70EO
MT

70A1
MT

70AO
M9

1108

M9

0901
MT

70AO
M9

0911 011
M9

1116

M9

0403
MT

70A1
MT

70AO

M9

0601

MT

70A2

653

046

245

555
660
002

180
001

180
085

210

046

802

246

556

555

740

060

553

187
709
001
002

180

002
050

180
477
003

180

TS

ACCESSORIES

W.f;I:J-f

No

Ret

W470269H01
W602171H01
W501637H01
W502193H01
W501636H01
W450619G02
W501400H01
W471432H01
B

503846H01

B

409034H0

P

648001X01
W34497
W476469H01
W476470H01
W473335H01

W487137H01

W341659H01

W487140H01

W481633H01

W487136G01
W487138H01
W487139H01

B

W500741H01
W484233H01
W502316H01
W601400H01

S

W484226H01

W487141H01

W500833H01

W484232H01

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503846H01

562211

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4

Thread guide

Tension
Tension spring
Tension disc Jor pretension
Pretension
Screw

Set
Thread guide

0-ring

Thread tension
Thread tension regulating
Thumb nut revolution
Tension spring
Tension releasing disc
Tension disc

Felt

Thread tension releasing pin
Thread tension stud
Thread take-up spring

Bushing

Screw
Thread guide
Screw
Screw 11/6
Washer
Thread guide
Stopper

Screw

Thread guide

rEJg_ulati'!9_

complete

11/64(40)X8

screw

S15

for

screw

9/64(40)X4

9/64(40) X 7.5

M4

3/32(56) X 3.4

Oescr.pbon

for

pretension

for

pretensjon

nut

for

p(etension

for

pretension

11/64(40)x5

regulator

thread tension regulator

11/64{40)X 5.5

4{40)x8

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complete

thumb

stopper

nut

ffm

Gift

Amt

Req

1
1
1

1
2
1

1

1

1

1

1

1

1

1
1
1
1
2

1

1

1

1

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Parts

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LZ-720 · 780 · 790

-

~f¥1J.r\-fJO~

THREAD

TAKE-UP

....

-,

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(

904

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69

)

10

COVRE MECHANISM

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79

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LZ-720 · 780 · 790

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THREAD

Fig

No. Parts

66
67
68
69
70

71

904

72

73
74
75
76
77
78
79
80

905

81

83

84

85
86

IB.fi.::t-~

M9

1215

M9

0622

M9

0612

MT

70AO

M9

0604

MT

70A2

MT

70EO

M9

0908

MT

70AO

MT

70A1

M9

090

M9

0901

M9

0906

MT

70A1

MT

70AO

MT

70A4

MT

70EO

M9

1103

M9

0501

M9

1207
MF 40AO
M9

1206

TAKE-UP

~tf::t-f

No

015
053
050
584
011
742
584
003
838
584

1 001

045
011
838

830

691 W343991HC1
830
011

050
002
352
002

Ref. No.

W501777H01
W483414H01
W474387H01
W231707H01
W501205H01
W484227H01
W344923G01
W602003H01
W484226H01
W231706H01
W600588HC1
W500307HC1
B

509269
W484223HC1
W231705HC1

W34

3990G0

W502941HC1

W500384HC1
W461723HC1
W475495HC1
W469860HC1

COVRE

MECHANISM

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~

X 19 Hinged screw 3

Spring washer 1 0
Washer
Thread take-up cover
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Cover plate (Plastic)
Thread take· up cover(2) complete
Screw
Thread cutting knife 1 0
Thread take-up cover

9/64(40)X3

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Set

screw
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plate 1

Gas

ket
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9

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for

face plate

co

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11

64(40)x7

16(28)x8

16(28)X22

phon

16(28)X

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4(40)X3

2.5 (knite adjust) 1

te

19

(2)

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filll

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I

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SHAFT

MECHANISM

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780 · 790

r.

l ,

(97) (97) 1

99

t

(102)

-~

J:.fSI001*

UPPER

Fig.

No

.

91
92
93
94
95

906

96

907

97
98

99

110
111

99
100
101
102

103

104

105
107

108

109

SHAFT

..

,H,:J-f

Parts. No. Ref.

M9
M9
M9
MT
MT
MT
MT
MT
M9
MT
MT
MT
MT

M9
MT

MT

M9

M9

MT
M9
MT
MT
M9
MT
MT

1261

003

1606

001 B

0501

064

70AO

383

70AO

456

70EO

383

70AO

230

70EO

230

1602

001

70A1

146

70AO

683

SOAO

235

70A2

146

0912

001

85AO

235

70A1

456

1503

007

1504

002

70AO

767

1502

002

70AO

682

80AO

682

2201

003

70AO

523

70AO 768

MECHANISM

~~:J-f

No

W484239H01

504016H01

S

684412H04

W484238H01

W484237G01
W343996H01

W343995G01
W500036H01
W483416H01
W484240H01
W484815H01

W483488H01

W483489H01

W487106H01

W501212H01
8

508963H01
p 980006:-<01
W500509H01
W343997H02
W343998H02
W461726H01

p

980008)(01

980007X01

P

e

:ijl

1L

~1":/Jl:.;f.:?-y

A 7

~

fa

~

1:.

J:.

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;!II

"

.,

1'

1-

.,

ta

~$t::IL:ijl,:t.y

3ft

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ljZ.

7

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Jv

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y

t/4(40x12

1/4(40)X7

5X28AV

~

6204LLBNR

~

(~)

?

~

(tJl) Upper shaft compete

..

1/4(40)x4

~

IJ

(LZ-7201JJ)

*

J...

(LZ-780ffl)

I)

v

9/64(40)X 12.5

J...

(LZ-7901J!)
6004LLBNR

~

15/64{28)X 10.5 Screw

::;

15/64(28)X10

(J::.)

::;

1

5/64(28x

(LZ-720.1JJ)

-

-

(LZ-7801tl)(LZ-790ffl) Balance wheel complete (LZ·780)

::;

1 1

/32(28) X 10

1-

("f)

12 Screw

i!ffl

illllt

Description

Screw
Set screw
Spring pin
Crank
Ball
Crank complete
Upper shaft 1

Set screw
Oil
Spiral gear
Worm

Ba
Screw

Timing belt pulley (upper)

Balance wheel complete

Screw
Timing belt
Timing belt pulley (under)

1/4(40)X

bearing 6204LLBNR

shelter

ll bearing

15/64{28) X 10.5
15/64(28) X 10

15/64(28)

1 1

12
1/4(40)X7
5X28AV

1/4(40)X4

X 1 2

/32{28)X

10

(U-7

20)

Amt
Req

1
1
1
1
2

1

1

12

2

4

~1!iicff.

0 0 0

N

co

0>

" " "

N

~

~

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()

0

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0 0 c

0 0

u

n

0

0

0 0 0

0

0 0

0

0 I I

0

0

0

0 I

0 0 0

1

0 0

0

1

0

1

0

1

0

0 0
0 0

0

1
1
1

1
2
1
1
1

1
1

0

0 0 0 I I

0 0

0

0

0 0

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00

0

0

00

00

0

00

0

00

0

I

I

I

--

-

I

I

LZ-720 · 780 · 790

-8-

-9

-

~fli,

it.fliJJBlH~

THREAD

TAKE-UP

LEVER

&

NEEDLE

BAR

ROCKING MECHANISM

LZ·

720 · 780 · 790

~"'

it.fiiiJfUH*-

THREAD

Ftg

No

116
117
118
119

908

120
121
122
123
124

126
127

• 128
129
130
131
132
133

e&~:J-t:

Parts

M9

0911 011

MT

70AO 601

MT

70AO

MT

70E1

MT

70EO

MT

70EO

MT

70AO 661

MT

70AO

M9

1117

MT

70/lD

MT

70AO

M9

1118

M9

0507

MT

70AO

MN

10AO

M9

1516 001

MT

70AO

M9

0400

TAKE-UP

Yt~::J-1-'

No

W502316H01

W484235H01
582
454
682

772

476
002
667

669
002
050
662

740

420
085

P

978001X01
W484234G01
P

978000X01
P

959001X01
P

951000X01
W484236H01
B 503844H01
W484247H01

W484217H01
B 509061H01
W484249H01
W484248H01
W500499H01
W500006H01
W484250·i01
S

64800H02

LEVER

Ref No

&

NEEDLE

0

;t.

fltti

o (fll)

"

..

,

-

JE

~ '#

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? Jl-

r

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~

(:11:")

fl\

{lft~

c

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t:

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y

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y

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(

ftt:::'

fi

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:g

641401

x 7.5

"'J\,"J"

'J

/64(40) X 13

64(40!X

8) X

/)

10

13

ROCKING

Screw

Thread take-up lever

-

Thread take-up lever
Thread
Thread take-up lever comolete

/ :1)

Needle
Needle bar connecting crank rod
Spacer

-

Screw
Needle bar connecting stud guide I

Needle bar rocking shaft bushlna
Screw
Washer 2
Needle bar connectina link au:de
Felt 1
Set screw
Ne;d!;
0 -ring

MECHANISM

~m

Descrptton

9

6M40lx7

take-y~

bearing

11

/64(40)X

11

/64(40) X 1 0 2

15/64(28

bar frame stopper 1

4P

.5

flttina

lever setting

13

)X

l3

olate

!;!In

illi

Ami

Aeq

2

1

1
1

,

1

1
1

2

,

2

1

2
2

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oo

0

CX)O'l

N

..........

.....

~~

~

l,

r 1

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(I

{ (

0

l

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0

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0

C)

(J

n

(J

0

0

0

0

0

(J

0

0

0

0 0

(

(J

0

(J

0 I

0

!(J

0

l

()

0 I

.....

<_l (

tIC

)(

(,

Common

Parts

I

I

I

I I

I

I

I

I

135
136
137
138
139
140
141
142
143

909

147
148
149

160

MF 10E1
M9

0602

M9

0816

MT

70AO 181

MT

70NJ

MT

70A1

MT

70AO

M9

0909

MT 70A1

MT

70EO

MT

70A2.

MT

70AO

M9

0922

M9

0302

148
002
002

660
740

~

003
420

--

866

740

780
002
053

W468715-101
W501567-101
W48421 0-101

W484244H01
W483420H01
W484246-101
W501901-101

- W484251

W343999G01

W483421H01
W483439H01
W464016H01

S561

121H02

-101

t:

:qL

:qL.

*'

jt

7

it

A

~

it

7

*

3f

/ ( ;r.

•

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:qL

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~

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~

-r

~

3/

32(56l

.;;

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~

<

tttt*-m

•

~

~

y

9/64(40!

(fi~t:·/)

..

.X

(t.ll)

~

$'"

y

9!

64(40)x8

>t

3.5

x 3 Screw

--

>

-

X6

--

-·

Oil braid

3/

32(56)X3

Screw 1/8(44)X

Thread guide

Needle
Felt
Needle bar·connectino stud
Screw
Needle bar frame

-

Needle bar frame complete 1

Felt 1
Holder 1
Screw 9/

bar

9/64!40lx6

4.5

for

needle bar

stOQQer

64{40)x8

-10-

1

1

1

1

1
1

,

1

,

1

1

(

r

()

JO

co

00
00

;..)

0

00
00

IOIO

00
00
00

00

1

"-'

(

c

I W484245-101

(l

0

('

0
0

0

0
0
0
0

LZ-720 ·

780-

I

I

790

=f-1.1~~00~

ZIG-ZAG MOTION MECHANISM

159

-

11

-

LZ-720 · 780 · 790

1 9

185

li~~~~~;:~

...

-1.01~

179

911

6

--

~+-175

-----.1

,

(1---17

I

6

-T-~~JIH~

ZIG-

ZAG

Ftg.

No Parts. No.

156
157
158
159
160 MF

MOTION

·~:J-~

M9

0920

MT

70A1

MT

70A1

M9

1 109 001
10E2

002
780
454

148

MECHANISM

~*'!:J-

Ref.

W501523H01
W472569H01
W483418H01
W500985H01
W462979H01

No

t:

.

$

=f.

:if-

*

'"

..

~T~~;t:f-

t:

dL

:;

9/64(40)X6.5

.,.

y

11/64(40)X6.6

'1:

~

Screw
Holder
Set pin

Set screw

Oil

9/64{40)X6.5

wick

for

Decripnon

11/64{40)X6.6

set pin

~.Iii

illlt

oo

NM

,...,...

Amt.

~~

Req

.

1

I

DI

1

IOI

1

IO

I

IO

I

f""'

I

~illS&.

0

en

,...

~

I

Common Parts

I

I

163
164

910

166
186
166
167
167
168
169
170
171

172

173

175

176

178
911
179
180

182

18

3

184
185 MF

MT

70AO

M91513001

MT

70EO

M9

1603

M9

1620

M9

1604

MT

70A1

MT

85AO

M9

1606

MT

70AO

M9

2402

MT

70AO

M9

1508

MT

70Al

MT

70A2

M9

1500

M9

1117

MT

70EO

MT

70A2

MT

70AO

MT

70AO

MT

70AO

M9

0919

10E2

843

886
022
045
022
886
886
001
950
035
910
001
833

833
086

002
683
454
760

666

606

002

148

W484220H01

B

60906

0H01

W346003G01
W468647
W482843H01
W487119H01
W484260H01
W487114H01

8

504016H01
W346007H01
W484269H01
W484261H01

8

509088H01
W484219H01

W484218H01

W468763H01

B

503844H01
W346002H01
W484252-i01
W484265-i01

P

980005X01

W484256H01

W465620rl01
W462729H01

H01

-T.~UU.b

~-r::;...~;l:f-

'f-

;f.

T

;f.

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;-~

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-'f 1\ v

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l)

~T~~;t-*':;

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-T~.ft;l

:t1Jv:::.--Jt-

A\

~

..

;t

~

Jv

15/64(28)

11

Jl-

"I

Jv

ti

ti

-

::,...

IIJR

DJ?

lb

'"

.:?-

(a!)

1/4(40)X
1/4(40)x5

..

"

l/4(40)X19

"

li

1/4(40)X7

- Zlg·Zag

:;

3/8(28)X20

? L

15/64(28)x8

~

JL-

(It}

~~~-

(1~)

NTN G15

-

:qz

I\

A

;-

{l;

-'f

.'iii!

.7.7.7.~~;/

3ft

;a

:r

,

I<

.

~

·l:

c

'*

t:

•

';I

:;

11/64(40)X 13

•

..

..

t:

;t&

:;

9/4(40)~6

'1:

9/64(40)X6

X 1 0 Set screw

Zig-Zag connecting

13

Bolt
Nut 1/
Bolt

Zig-Zag connecting rod

Zig-Zag connecting
Set screw

Thumbscrew

ink

Set screw

Zig·Zag motion shaft bushing (rear)

Zig-Zag motion shaft bushing (front) 1
Oil seal

Screw
Spiral gear
Zig-Zag motion shaft
Eccentric link 1

Zig

-Za_g_

Thrust plate cting rod

Screw
Oil wick

15/64(

28)X

10

link

complete

4(40)X5

rod

1/4(40)x7

width

regulating lever

3/8(28)X20

15/64(28)X8

NTN

G15

11

/ 64(40) X 1 3 3

connecting rod

9/64(40)X6

()

->

0

tH)

r l C

2
2

1

1

1
1

nc

1

1

6

0(

1

0[

1

0

1n 1r

1

2

1

1

) I

1

0 I

1

0

()

1

( I

1

l

(I

3
1

lv

)10

I

I

'

I

I

I

I

I

I

I

I

I

I

l

'

I I

I

I

LZ

-720 ·

-

12

-

780 · 790