JUKI LU-2220N-7 Instruction Manual

ENGLISH

Lu-2220N-7

INStructIoN MaNuaL

i

CONTENTS

1. SPECIFICATIONS .................................................................................................................... 1

2. INSTALLATION ........................................................................................................................ 1

(1) Attaching the hinge seats and support rubber of the machine head .............................................. 1

(2) Attaching the oil pan ............................................................................................................................1

3. INSTALLING THE WASTE OIL CONTAINER ......................................................................... 2

4. ADJUSTING THE BELT TENSION .......................................................................................... 2

5. INSTALLING THE SYNCHRONIZER SUPPORT ROD ........................................................... 2

6. ATTACHING THE BELT COVER ............................................................................................. 3

7. INSTALLING THE KNEE SWITCH .......................................................................................... 3

8. INSTALLING THE AIR DRIVE UNIT ........................................................................................ 4

(1) Installing the air control unit ............................................................................................................... 4

(2) Connecting the air hose ....................................................................................................................... 5

(3) Adjusting the air pressure ...................................................................................................................6

9. INSTALLING THE THREAD STAND ....................................................................................... 7

10. LUBRICATION ....................................................................................................................... 7

11. ATTACHING THE NEEDLE ...................................................................................................9

12. ATTACHING/REMOVING THE BOBBIN ............................................................................... 9

13. THREADING THE HOOK .................................................................................................... 10

14. INSTALLING THE THREAD GUIDE .................................................................................... 10

(1) Installing the needle thread guide rod .............................................................................................. 10

(2) Installing the bobbin winder thread guide .......................................................................................10

15. WINDING A BOBBIN ........................................................................................................... 11

16. ADJUSTING THE AMOUNT OF OIL IN THE HOOK .......................................................... 11

17. THREADING THE MACHINE HEAD ................................................................................... 12

18. ADJUSTING THE STITCH LENGTH ................................................................................... 13

19. THREAD TENSION ............................................................................................................... 13

(1) Adjusting the length of thread remaining after thread trimming ...................................................13

(2) Adjusting the needle thread tension.................................................................................................13

(3) Adjusting the bobbin thread tension ................................................................................................ 13

20. THREAD TAKE-UP SPRING ............................................................................................... 14

(1) When you want to change the stroke of the spring : ......................................................................14

(2) When you want to change the tension of the spring : ....................................................................14

21. HAND LIFTER / HANDHEBEL ............................................................................................ 14

22. ADJUSTING THE PRESSURE OF THE PRESSER FOOT ................................................ 14

23. NEEDLE-TO-HOOK RELATION .......................................................................................... 15

24. ADJUSTING THE HOOK NEEDLE GUARD ....................................................................... 15

25. ADJUSTING THE BOBBIN CASE OPENING LEVER ........................................................ 16

v

26.

ADJUSTING THE THREAD TRIMMING MECHANISM COMPONENTS ...............................16

(1) Positioning the thread trimming cylinder joint ..............................................................................16

(2) Adjusting the position of the feed dog ............................................................................................16

(3)-1. Counter knife

(3)-2. Counter knife (Adjusting the lateral position) ............................................................................. 18

(4) Moving knife (Adjusting the vertical position) ................................................................................ 19

(5) Counter knife (Adjusting the vertical position) ...............................................................................20

(6) Thread guide installing position ....................................................................................................... 20

(7) Adjusting the knife pressure ............................................................................................................ 21

(8)-1. Initial position of the moving knife drive arm and the moving knife ........................................22

(8)-2. Adjusting the clearance between the moving knife drive arm and the moving knife drive arm

stopper .............................................................................................................................................. 23

(8)-3. Installing position of the moving knife return plate ...................................................................23

(9) Adjusting the thread trimming cam timing ...................................................................................... 24

(10) Installing position of the clamp spring .......................................................................................... 25

(11) Adjusting the condensation amount .............................................................................................. 26

(12) Explanation of the solenoid valve .................................................................................................. 27

(Adjusting the travel amount) (Positioning of the counter knife base stopper) ........... 17

27. ADJUSTING THE LIFTING AMOUNT OF THE PRESSER FOOT AND THE WALKING

FOOT ................................................................................................................................... 28

28. SEWING SPEED TABLE ..................................................................................................... 28

(1) Max. sewing speed in accordance with the amount of the alternating vertical movement of the

walking foot and the presser foot ................................................................................................... 28

29. RESETTING THE SAFETY CLUTCH .................................................................................. 28

30. OPERATION SWITCHES .................................................................................................... 29

31. KNEE SWITCH .................................................................................................................... 31

32. CAUTIONS WITH REGARD TO THE SEWING OPERATION ............................................ 31

33. TROUBLES IN SEWING AND CORRECTIVE MEASURES ............................................... 32

vi

1. SPECIFICATIONS

Model LU-2220N-7

Applications Car seats, furniture, etc.
Sewing speed Max. 3,500 rpm See “ 28. SEWING SPEED TABLE” on page 28.

Stitch length (max.) Normal feed : 9 mm Reverse feed : 9 mm
Needle SCHMETZ 34 x 35R (Nm 0 to Nm 60)
Hook Vertical-axis, .6-fold hook
Lift of presser foot Hand lifter lever : 9 mm Knee lifter : 6 mm
Lubricating oil JUKI New Defrix Oil No. 

Workplace-related noise at sewing speed

Noise

n = 2.500 min- : LPA ≦ 84 dB (A)

Noise measurement according to DIN 45635-48-A-.

2. INSTALLATION

Nail

Support rubber of
the machine head

Rubber cushion

Support rubber of the
machine head

Nail

Hinge seat

Spacer rubber

Support rubber of the machine head

Nail

A

Small articles
case

(1) Attaching the hinge seats and support

rubber of the machine head

Fix th e hinge seats and th e support ru bbers
supplied with the machine on the table using nails.

When driving nail A, drive it slantingly

so that it does not pass through the

side of the small articles case.

Nail

A

Small articles
case

Top surface of
the machine table

Operator’s side

1

Align

Align

Table

20 mm

(2) Attaching the oil pan

Fix oil pan 1 supplied with the machine on the

table in 8 places with wood screws.

50 mm

−  −

3. INSTALLING THE WASTE OIL CONTAINER

4
5

Oil pan

8
5

2

1

3

6

7

4. ADJUSTING THE BELT TENSION

WARNING :

To avoid possible personal injury due to abrupt start of the machine, turn off the power to the
machine and check to be sure that the motor has totally stopped rotating in prior.

) Attach drain plug 1, oil seal 2 and washer 3 to

the oil pan. Attach packing 5 and washer 8 to
screw 4 and x them with nut 6.

2) After they are xed, screw in waste oil container

into drain plug 1.

7

Adjust the belt tension with the height of the motor so

that the belt sags 5 mm when the center of V belt is

applied with a 9.8N load.

Handwheel

15mm

9.8N

Motor pulley

5. INSTALLING THE SYNCHRONIZER SUPPORT ROD

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.

) Attach synchronizer support rod 1 to the arm

using attaching nut 2.

2

1

− 2 −

6. ATTACHING THE BELT COVER

Notch (upper)

B

4

4

1

2

Notch (lower)

A

3

5

) Fix belt cover (rear) 1 on the arm with screws 2.

2) Fit belt cover (front) 3 to notch (upper) A and
notch (lower) B of the belt cover (rear).

3) Fix belt cover (front) 3 with screws 4 and 5.

4) Fix belt cover auxiliary plate 6 at the position of
0 mm from the rear end with wood screws 7

when there is a clearance of 2.5 mm between the
belt cover and the auxiliary plate.

5) When tilting the machine head, loosen wood
screws 7 and move the belt cover auxiliary plate
in the direction of the arrow until it stops. Then, tilt
the machine head.

6

7

2.5 mm

10 mm

7. INSTALLING THE KNEE SWITCH

2

1

3

Afterattachingthebeltcover,conrm

whether or not the respective cords do

not come in contact with the belt and

the handwheel. Disconnection of the

cords will result when they come in

contact with one another.

) Attach supporting base 2 of knee switch 1 onto

the underside of the table using wooden screws

.

3

2) Fix cord 4 to an appropriate position on the table
using a staple supplied with the machine so as to
prevent the cord from hindering the operation.

4

− 3 −

8. INSTALLING THE AIR DRIVE UNIT

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.

3

4

Rear view of table

2

1

(1) Installing the air control unit

) Install regulator (asm.) 1 on the bottom surface

of the table with wood screw 2 supplied as
accessories.

2) Install air control unit (asm.) 3on the bottom
surface of the table in four places with wood
screws 4 supplied as accessories.

3) Install regulator (asm.) 1 and air control unit
(asm.) 3 in the broken line frame as shown in
the illustration on the left side. Determine the
installing position where it is convenient to the
user.

− 4 −

1

2

(2) Connecting the air hose

) Connect the air hoses coming from the air control

unit to the air cylinders of the sewing machine
as shown in the illustration. Adjust the seal Nos.
pasted on the hoses to those pasted on the joints,
and connect as described in the list.

Be sure to pass the hoses through hole !0 in the

table.

After connecting them, bundle air hoses 1, 2, 5,

, and C, 6-stage switch cord 6 using cable clip

B

of the machine head.

!1

Directly pass air hoses 7 and 8 through hole !0

in the table.

2) Pass air hoses 3, 4 and 9 coming from the

sewing machine through hole !0 bin the table,
and connect them to the air control unit.

(There are clip bands in the accessories. Use

them to arrange the air hoses if necessary.)

!1

349

!0

78

Clip band

C

B

!2

5

6

− 5 −

!3

3) Pass air hoses 5 through cord cover !2 the same
as 6-range switch cord 6, pass them through

clearance A between 6-range switch !3 and the
machine arm, and connect them to the joint of air
hoses 5.

C

5

B

8 9 4

Decrease Increase

5

7 3 1

2

A

1

Solenoid valve Cylinder

Condensation

BT

Thread trimming

Thread trimming

Thread clamp

FL

FL

DL

2P
2P

1 1
2 2
3 3
4 4
5 5
7 7
8 8
9 9
B B
C C

(3) Adjusting the air pressure

Adjust the air pressure to 0.4 to 0.5 MPa using air

pressure regulating knob 1 of regulator. Pull knob

up and turn it to properly adjust the operating

1

air pressure. After the adjustment, press the knob
down into the home position.

− 6 −

9. INSTALLING THE THREAD STAND

) Assemble the thread stand and set it to the hole

2) Tighten locknut 1 to x the thread stand.

3) When ceiling wiring is possible, pass the power

2

1

10. LUBRICATION

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.

of the table.

cord through spool rest rod 2.

4

2

3

LU-2220N-7

Oil window

1

5

) Pour the JUKI New Defrix Oil No.  into the oil

tank in the bed from lubrication hole 1 until H
level 3 of oil gauge 2 is reached.

2) Add the same lubricating oil as soon as the oil
level has come down to L level 4.

3) After the lubrication, operate the sewing machine
and check that the oil rises up to the oil sight
window.

1. Do not use any lubrication oil other

thanthespeciedtype.Besureto

close cap 5 of the oil hole.

2. When you operate your machine

forthersttimeaftertheset-upor

after an extended period of disuse,

apply two or three drops of oil to

the sections indicated with arrows.

(Refer to Fig. 1 on the next page.)

3. To use the machine that has been

disused for an extended period

of time, run in the machine for

approximately 10 minutes at 1,800

rpm.

−  −

In the case where the machine is operated with

¡

the hook lled with normal amount of oil, the

oil level descends from H level to the L level in

approximately 00 hours .

Supply oil

Filter

7

8

Supply oil

Supply oil

Flg.1

[Cleaningthelter]

) Approximately once a month, remove screws 6

from the lter case and clean magnet 7 and lter

element 8 inside the lter.

2) If the lter is clogged with soil, circulation failure

will result.

This will give rise to oil leakage from the upper

portion of the hook driving shaft saddle.

6

7

6

− 8 −