lu-2220n-7 instruction manual （english）...tank n the bed from lubr cat on hole 1 unt l h level 3...

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ENGLISH

INStructIoN MaNuaLLu-2220N-7

v

CONTENTS

1. SPECIFICATIONS .................................................................................................................... 12. 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 ......................................................................... 24. ADJUSTING THE BELT TENSION .......................................................................................... 25. INSTALLING THE SYNCHRONIZER SUPPORT ROD ........................................................... 26. ATTACHING THE BELT COVER ............................................................................................. 37. INSTALLING THE KNEE SWITCH .......................................................................................... 38. 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 ....................................................................................... 710. LUBRICATION ....................................................................................................................... 711. ATTACHING THE NEEDLE ................................................................................................... 912. ATTACHING/REMOVING THE BOBBIN ............................................................................... 913. THREADING THE HOOK .................................................................................................... 1014. 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 ........................................................................................................... 1116. ADJUSTING THE AMOUNT OF OIL IN THE HOOK .......................................................... 1117. THREADING THE MACHINE HEAD ................................................................................... 1218. ADJUSTING THE STITCH LENGTH ................................................................................... 1319. 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 ............................................................................................ 1422. ADJUSTING THE PRESSURE OF THE PRESSER FOOT ................................................ 1423. NEEDLE-TO-HOOK RELATION .......................................................................................... 1524. ADJUSTING THE HOOK NEEDLE GUARD ....................................................................... 1525. 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 (Adjusting the travel amount) (Positioning of the counter knife base stopper) ........... 17(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

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 ...................................................................................................2829. RESETTING THE SAFETY CLUTCH .................................................................................. 2830. OPERATION SWITCHES .................................................................................................... 2931. KNEE SWITCH .................................................................................................................... 3132. CAUTIONS WITH REGARD TO THE SEWING OPERATION ............................................ 3133. TROUBLES IN SEWING AND CORRECTIVE MEASURES ............................................... 32

− � −

1. SPECIFICATIONS

Model LU-2220N-7Appl�cat�ons Carseats,furn�ture,etc.Sew�ngspeed Max. 3,500 rpm See “ 28. SEWING SPEED TABLE” on page 28.St�tchlength(max.) Normalfeed:9mmReversefeed:9mmNeedle SCHMETZ �34 x 35R (Nm ��0 to Nm �60)Hook Vertical-axis, �.6-fold hookL�ftofpresserfoot Hand lifter lever : 9 mm Knee lifter : �6 mmLubr�cat�ngo�l JUKI New Defrix Oil No. �

No�seWorkplace-relatedno�seatsew�ngspeedn=2.500m�n-�:LPA≦ 84 dB (A)Noise measurement according to DIN 45635-48-A-�.

2. INSTALLATION

Spacer rubber

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

F�x the h�nge seatsand the support rubberssuppl�edw�ththemach�neonthetableus�ngna�ls.

When driving nail A, drive it slantingly so that it does not pass through the side of the small articles case.

Nail

Hinge seat

(2) Attaching the oil pan F�xo�lpan1suppl�edw�ththemach�neonthe

table�n8placesw�thwoodscrews.

Table

Align

1

50 mm

20 mm

Operator’s side Align

Rubber cushion

Support rubber of the machine head

Small articles case


NailNailA

Nail

A

Small articles caseTop surface of the machine table


− 2 −

1

2

3. INSTALLING THE WASTE OIL CONTAINER

Oil pan

7

4

5

58

2

1

3

6

�) Attach drain plug 1,o�lseal2andwasher3totheo�lpan.Attachpack�ng5andwasher8toscrew4 and fix them with nut 6.

2) After they are fixed, screw in waste oil container 7�ntodra�nplug1.

5. INSTALLING THE SYNCHRONIZER SUPPORT ROD

�) Attach synchronizer support rod 1tothearmus�ngattach�ngnut2.

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

4. ADJUSTING THE BELT TENSION

Adjust thebelt tens�onw�ththehe�ghtof themotorsothat the belt sags �5 mm when the center of V belt is appl�edw�tha9.8Nload.

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.

Handwheel

Motor pulley

9.8N15mm

− 3 −

�) Fix belt cover (rear) 1onthearmw�thscrews2.2) F�tbeltcover(front)3tonotch(upper)Aand

notch(lower)Bofthebeltcover(rear).3) F�xbeltcover(front)3w�thscrews4and5.4) Fix belt cover auxiliary plate 6atthepos�t�onof

�0 mm from the rear end with wood screws 7whenthere�saclearanceof2.5mmbetweenthebeltcoverandtheaux�l�aryplate.

5) Whent�lt�ngthemach�nehead,loosenwoodscrews7andmovethebeltcoveraux�l�aryplate�nthed�rect�onofthearrowunt�l�tstops.Then,t�ltthemach�nehead.

Afterattachingthebeltcover,confirmwhether 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.

6. ATTACHING THE BELT COVER

4A

41

35

B2

Notch (upper)

Notch (lower)

10 mm2.5 mm

76

7. INSTALLING THE KNEE SWITCH

�) Attach supporting base 2ofkneesw�tch1ontotheunders�deofthetableus�ngwoodenscrews3.

2) F�xcord4toanappropr�atepos�t�ononthetableus�ngastaplesuppl�edw�ththemach�nesoastopreventthecordfromh�nder�ngtheoperat�on.

4

2

3

1

− 4 −

(1) Installing the air control unit�) Install regulator (asm.) 1onthebottomsurface

ofthetablew�thwoodscrew2suppl�edasaccessor�es.

2) Installa�rcontrolun�t(asm.)3onthebottomsurfaceofthetable�nfourplacesw�thwoodscrews4suppl�edasaccessor�es.

4

2

3

1

8. INSTALLING THE AIR DRIVE UNIT


3) Installregulator(asm.)1anda�rcontrolun�t(asm.)3�nthebrokenl�neframeasshown�nthe�llustrat�ononthelefts�de.Determ�nethe�nstall�ngpos�t�onwhere�t�sconven�enttotheuser.

Rear view of table

− 5 −

2) Pass air hoses 3,4and9com�ngfromthesew�ngmach�nethroughhole!0b�nthetable,andconnectthemtothea�rcontrolun�t.

(Therearecl�pbands�ntheaccessor�es.Usethemtoarrangethea�rhoses�fnecessary.)

(2) Connecting the air hose�) Connect the air hoses coming from the air control

un�ttothea�rcyl�ndersofthesew�ngmach�neasshown�nthe�llustrat�on.AdjustthesealNos.pastedonthehosestothosepastedonthejo�nts,andconnectasdescr�bed�nthel�st.

Be sure to pass the hoses through hole !0�nthetable.

Afterconnect�ngthem,bundlea�rhoses1,2,5,B,andC, 6-stage switch cord 6us�ngcablecl�p!1ofthemach�nehead.

D�rectlypassa�rhoses7and8throughhole!0�nthetable.

1

2

349

78

!0

!1

Clip band

C

B

6

5!2

− 6 −

(3) Adjusting the air pressure Adjust the air pressure to 0.4 to 0.5 MPa using air

pressureregulat�ngknob1 of regulator. Pull knob 1upandturn�ttoproperlyadjusttheoperat�nga�rpressure.Aftertheadjustment,presstheknobdown�ntothehomepos�t�on.

1

Decrease Increase

B

C

57 3 1Soleno�dvalve Cyl�nder

Condensat�on 1 1

BT 2 2

Threadtr�mm�ng 3 3

Threadtr�mm�ng 4 4

Threadclamp 5 5

FL 7 7

FL 8 8

DL 9 9

2P B B

2P C C

8 9 4 2

3) Pass air hoses 5throughcordcover!2thesameas 6-range switch cord 6,passthemthroughclearanceA between 6-range switch !3andthemach�nearm,andconnectthemtothejo�ntofa�rhoses5.

5

!3

A

− � −

10. LUBRICATION

5

2

4 3

1

LU-2220N-7

Oil window

�) Pour the JUKI New Defrix Oil No. � into the oil tank�nthebedfromlubr�cat�onhole1unt�lHlevel3ofo�lgauge2�sreached.

2) Addthesamelubr�cat�ngo�lassoonastheo�llevelhascomedowntoLlevel4.

3) Afterthelubr�cat�on,operatethesew�ngmach�neandcheckthattheo�lr�sesuptotheo�ls�ghtw�ndow.

1. Do not use any lubrication oil other thanthespecifiedtype.Besuretoclose cap 5 of the oil hole.

2. When you operate your machine forthefirsttimeaftertheset-uporafter 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.

¡ Inthecasewherethemach�ne�soperatedw�ththe hook filled with normal amount of oil, the o�lleveldescendsfromHleveltotheLlevel�napproximately �00 hours .


�) Assemble the thread stand and set it to the hole ofthetable.

2) T�ghtenlocknut1 to fix the thread stand.3) Whence�l�ngw�r�ng�sposs�ble,passthepower

cordthroughspoolrestrod2.

9. INSTALLING THE THREAD STAND

2

1

− 8 −

Supply oil

Supply oil Supply oil

Flg.1

Filter

7

7

6

8

6

[Cleaningthefilter]�) Approximately once a month, remove screws 6

from the filter case and clean magnet 7 and filter element8 inside the filter.

2) If the filter is clogged with soil, circulation failure w�llresult.

Th�sw�llg�ver�setoo�lleakagefromtheupperport�onofthehookdr�v�ngshaftsaddle.

− 9 −

12. ATTACHING/REMOVING THE BOBBIN

1

�) Lift latch 1ofhook,andtakeoutthebobb�n.2) Put the bobbin into the shaft in the hook correctly

andreleasethelatch.

11. ATTACHING THE NEEDLE

2

1

Use a SCHMETZ �34 x 35R needle.�) Turn the handwheel to bring the needle bar to the

h�ghestpos�t�onof�tsstroke.2) Loosenneedleclampscrew2,andholdneedle

1sothatthelonggroove�ntheneedle�sfac�ngexactlytotheleft.

3) Push the needle 1deep�ntotheneedleclampholeunt�l�tw�llgonofurther.

4) Tighten needle clamp screw 2 firmly.Long groove



− �0 −

2

1

14. INSTALLING THE THREAD GUIDE

(1) Installing the needle thread guide rod�) Install needle thread guide rod 1w�thnut2.

(2) Installing the bobbin winder thread guide

�) Attach bobbin winder thread guide 1tothebobb�nw�nderonthemach�nearmus�ngscrews2.

2) Adjustthepos�t�onofthethreadgu�dereferr�ngto“15. WINDING A BOBBIN”.

1

2

13. THREADING THE HOOK

12

�) Pass the thread through thread path 1�nthehookandthreadhole2�nthelever,anddrawthethread.

Now,thethreadw�llbebroughttothethreadhole2v�athetens�onspr�ng.

• Makesurethatthebobb�nrevolves�nthed�rect�onofthearrowwhenyoudrawthethread.


− �� −

16. ADJUSTING THE AMOUNT OF OIL IN THE HOOK

�) Adjust the amount of oil in the hook by turning o�lamountadjustmentscrew1mountedonthehook.

2) Turn�ngtheadjustmentscrewclockw�sew�lldecreasetheamountofo�l�nthehookorcounterclockw�sew�ll�ncrease�t.

3) Place a piece of paper near the periphery of the hook, and run the machine for approximately five seconds.Theproperamountofo�l�nthehook�sobta�nedwhentheo�lspotsl�ghtlymakestr�peson the paper as shown in the figure.

A piece of paper

15. WINDING A BOBBIN

�) Pass the thread in the order, AthroughH.Thenw�nd�tseveralturnsroundthebobb�n.

2) T�ltbobb�npresser1.3) Adjustbobb�nthreadamountadjustmentscrew2

tow�ndabobb�nabout90%of�tscapac�ty. Turnthescrewcounterclockw�seto�ncreasethe

amountofthreadtobewoundroundthebobb�n,orclockw�setodecrease�t.

4) If the bobbin is wound unevenly, correct it by mov�ngthreadgu�de3ofthebobb�nw�nderbackorforth.

Thent�ghtenscrews4.5) When the bobbin is filled up, the bobbin presser

automat�callyreleasesthebobb�nandthebobb�nw�nderstopsrunn�ng.

AB

CD

E

F

4

G

H

3

5

2

1

1



− �2 −

17. THREADING THE MACHINE HEAD

Thread the mach�nehead follow�ng the order ofAthroughtoPasshown�nthe�llustrat�ong�venabove.


I

L

K

J

M

N

O

A

F

D

B

C

E

G

H

P

Threading method : draw the thread to the operator's side.

Needle thread

N

− �3 −

Turn standard feed adjust�ng d�al1 or 2P feed adjust�ngd�al3counterclockw�seorclockw�sesothatthe number correspond�ng to the des�red number �sbrought to the topof thed�alunt�l themark�ngspot �sreached.

When turning 2P feed adjusting dial 3,besuretoconfirmthat2PswitchisOFF.The scale 3 or less of 2P feed adjusting dial (place where the dial stops with the dial stopper) is for adjusting the 2P feedadjustingdialto"0"point.The scale 3 or less cannot be used.

For the details of 2P device, refer to "30.OPERATIONSWITCHES".

[Reversefeedstitching]�) Press down reverse feed control lever 2.2) Reversefeedst�tch�ngcanbeperformedaslong

asyoukeeppress�ngtheleverdown.3) Releasethelever,andthemach�new�llrun�nthe

normalfeedd�rect�on.

18. ADJUSTING THE STITCH LENGTH

3

1

2

19. THREAD TENSION

3

2

1

B A

B A C

D

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

Turn thread tension nut No. � 1clockw�seAtoshortenthelengthofthreadrema�n�ngafterthreadtr�mm�ng.Turnthenutcounterclockw�seBtolengthen�t.

(2) Adjusting the needle thread tension Turnthreadtens�onnutNo.2 2clockw�se

Ato�ncreasetheneedlethreadtens�on,orcounterclockw�seBtodecrease�t.

(3) Adjusting the bobbin thread tension Turntens�onadjustmentscrew 3clockw�se

Cto�ncreasethebobb�nthreadtens�on,orcounterclockw�seDtodecrease�t.

− �4 −

20. THREAD TAKE-UP SPRING

IncreaseDecrease2

5

14

3

21. HAND LIFTER / HANDHEBEL

1

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

�) Loosen screw 2�nthestopper,andmovestopper3tother�ghtorlefttochangestrokeofthreadtake-upspr�ng1.

2) Movethestoppertother�ghtto�ncreasethestrokeofthethreadtake-upspr�ng,orthelefttodecrease�t.

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

�) Loosen nut 4,andmovespr�ngstud5counterclockw�seto�ncreasethetens�onofthespr�ng,orclockw�setodecrease�t.

�) When you want to keep the presser foot in the l�ftedpos�t�on,turnhandl�fter 1�nthed�rect�onofthearrow.Th�smakesthepresserfootr�se9mmandstayatthatpos�t�on.

2) Tomakethepresserfootcomedownto�tshomepos�t�on,lowerthehandl�fter.

1

Increase

Decrease

22. ADJUSTING THE PRESSURE OF THE PRESSER FOOT

�) Turn presser spring regulating dial 1clockw�seto�ncreasethepressureofthepresserfoot,orcounterclockw�setodecrease�t.

(Be sure to operate the sewing machine with the pressureofthepresserfootm�n�m�zedaslongasthepresserfootsecurelyholdsthemater�al.)


− �5 −

23. NEEDLE-TO-HOOK RELATION

0.02 - 0.1 mm3

2

51

4

1.4

mm

2.0

mm

�) Adjustthestandardfeedadjust�ngd�alto"0".2) Loosenhookdr�v�ngshaftsetcollarclamp�ngscrew3,andturnthehandwheelcounterclockw�setomake

theneedlebarascendby2.0mmfromthelowestpos�t�onof�tsstroke.3) Inthestatedescr�bed�n2),al�gnbladepo�nt1ofthehookw�ththecenterofneedle2,andt�ghtenhook

dr�v�ngshaftsetcollarclamp�ngscrew3. At this time, a clearance of �.4 mm is provided between the blade po�ntofthehookandthetopendoftheneedleeyelet.(Asreference,thehandwheelpo�ntermeetsthemarkerl�neofthescaleLonthehandwheel.)

4) Loosen screw 4�nthetopfaceofthebedandscrew5�nthehookdr�v�ngshaftsaddle,andadjustsothat a clearance of 0.02 to 0.� mm is provided between the blade point of hook and the needle by moving the hook driving shaft saddle to the right or left. Once the specified clearance is obtained, securely tighten screws4and5.

5) Setthestandardfeedadjust�ngd�altomax�mumvalue,andcheckthatthebladepo�ntofthehookdoesnotcome�ncontactw�ththeneedle.

The operation panel could come in contact with the thread stand when tilting the machine head. To protect the relevant parts from contact, shift the thread stand to a position at which the thread stand does not interfere with the control panel.

24. ADJUSTING THE HOOK NEEDLE GUARD

30.15 - 0.2 mm

1

2

2

Whenahookhasbeenreplaced,besuretocheckthepos�t�onofthehookneedleguard.Asthestandardpos�t�onofthehookneedleguard,hookneedleguard2mustpushthes�defaceofneedle1 to lean the needle by 0.�5 to 0.2 mm away from�tsstra�ghtpos�t�on.Ifnot,adjustthehookneedleguardbybend�ng�t.�) If you want to move the hook needle guard

�nwards,turnadjust�ngscrew3clockw�se.2) Ifyouwanttomovethehookneedle

guardoutwards,turnadjust�ngscrew3counterclockw�se.



− �6 −

25. ADJUSTING THE BOBBIN CASE OPENING LEVER

�) Turn the handwheel to move bobbin case opening lever1�nthed�rect�onofthearrowA,andloosenscrew2.

2) Turnthehandwheeltomovebobb�ncaseopen�nglever1�nthed�rect�onofarrowB,andloosenscrew3.

3) Turnbobb�ncase4�nthed�rect�onofarrowCtount�lbobb�ncasestopper5rests�ngrooveDonthroatplate6.Inth�sstate,adjustsothataclearance of 0.� to 0.3 mm is provided between topendEofbobb�ncaseopen�ngleverandprotrus�onFonthebobb�ncasewhentheyapproachmost.Then,t�ghtenscrews2and3.

F

6 C

5

AB

D3

E 4

0.1 - 0.3 mm

1E

2

(1) Positioning the thread trimming cylinder joint Thread tr�mm�ng cyl�nder1 and thread tr�mm�ngcyl�nderjo�nt2havetobeassembledasshown�nthefigure on the left side.

(2) Adjusting the position of the feed dogInstallthefeeddog�ntermsofthew�ndowholeofthethroatplatetothepos�t�onbelowoncond�t�onthatthestandard feed dial : P = 0.

• Laterald�rect�on:Clearancebetweentheleftandr�ght�sequal(centerofthew�ndowholeofthroatplate)

• Long�tud�nald�rect�on:Clearanceontheoperators�de�s5.7±0.2mm.

A = B

5.7

± 0.

2 m

mP=

0

A B

1

2

26. ADJUSTING THE THREAD TRIMMING MECHANISM COMPONENTS

7.0 ± 0.5 mm



− 17 −

1

a

(3)-1. Counter knife (Adjusting the travel amount) (Positioning of the counter knife base stopper)

1) Turn the handwheel to adjust the thread take-up lever to the lower dead point, loosen counter knife base stopper setscrew 4 and counter knife drive arm clamp screw 2, and adjust the clearance between thread trimming cylinder joint 3 and joint stopper 4 to 9.0 ± 0.5 mm.

(At this time, the gauge for adjustment supplied as accessories can be used.)

2) When the distance between the tip of counter knife and the groove of machine bed is 37.8 ± 0.1 mm, make the counter knife base and counter knife base stopper come in contact a with each other.

(At this time, gauge for adjustment supplied as accessories can be used.)

3) Tighten counter knife base stopper setscrew 1 and counter knife drive arm clamp screw 2.

3

4

9.0 ± 0.5 mm

37.8

± 0

.1 m

m

37.8 ± 0.1 mmTop surface of machine bed

Groove section of slide plate

Counter knife

2.4 mm

Gauge for adjustment supplied as accessories

37.8 mm

26.8 mm29 mm

Thickness : 0.6 mm

43 mm

9 m

m

2

− �8 −

�) Loosen counter knife setscrews 1.2) Setthefeedd�alto"0",adjustthethreadtake-

uplevertothelowerdeadpo�nt,andactuatethesoleno�dvalvebyhandtomatethestatethatthethreadtr�mm�ngcyl�nder�sdrawn.

(Press the manual switch of solenoid valve No.3tomakethestateoflock.Referto"(12)Explanationofthesolenoidvalve".)

3) Keep�ngthestateof2),movecounterkn�fe2tother�ghtandleft.Thenadjustthed�stancefromfeeddog3tothreadgu�de4 to 2.4 ± 0.�5 mm andt�ghtencounterkn�fesetscrews1.

(Atth�st�me,thegaugeforadjustmentsuppl�edasaccessor�escanbeused.)

4) Release the manual switch of solenoid valve that hasbeenactuated�n(3)–2–2).(Referto"(12)Explanationofthesolenoidvalve".)

2

4

3

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

When installing the counter knife, tighten the screws while pressing the counter knife to the anti-operator side.

Confirmation:Actuatethesolenoidvalvebyhandtomovethethreadtrimmingaircylinderandconfirmthefollowingsinthestatethatthecounterknifebasecomesincontactwiththecounterknifebase stopper :

• Distance between the tip of counter knife and the machine bed is 37.8 ± 0.1 mm. • Clearance between the cylinder joint and the joint stopper is 9.0 ± 0.5 mm. • Distance from the left end of feed dog to the thread guide is 2.4 ± 0.1 mm.

2.4 ± 0.15 mm

Counter knife base

2.4 mm


37.8 mm

26.8 mm29 mm

Thickness : 0.6 mm

43 mm

9 m

m

1

− 19 −

(4) Moving knife (Adjusting the vertical position)

1) Loosen moving knife drive arm clamping screw 1 and moving knife shaft thrust collar setscrew 2 and tighten them again after adjusting the vertical direction of moving knife 3. When tightening moving knife drive arm clamping screw 1, perform the items (7), (8), (9) and (10) that are mentioned later.

2) The vertical position of moving knife is the position where the clearance between the bottom surface of throat plate (reverse side) and the top surface of moving knife 3 is 0.5 to 0.6 mm.

(At the time of adjustment, the gauge for adjustment supplied as accessories can be used.)

3

0.5 to 0.6 mm

Throat plate

2.4 mm


37.8 mm

26.8 mm29 mm

Thickness : 0.6 mm

43 mm

9 m

m

2

1

− 20 −

(5) Counter knife (Adjusting the vertical position)

�) Loosen counter knife base clamping screw 1,adjust�ttothepos�t�onwheretheupperendofthebladesect�onofcounterkn�fe2al�gnsw�ththetopsurfaceofmov�ngkn�fe3,andt�ghtenthescrewaga�n.(Atth�st�me,becarefulofthebladepo�ntofhook.It�ssafetoworkwh�leadjust�ngthema�nshaftangletothepos�t�onnearLengravedmarkerl�ne.)

1

2 3

(6) Thread guide installing position

�) Loosen thread guide setscrews 1andt�ghtenthemaga�nafteradjust�ngthepos�t�onofthreadgu�de2.

Install�ngpos�t�on:Thetopsurfaceofthreadgu�de2shouldal�gnw�ththetopsurfaceofmov�ngkn�fe3�nthevert�cald�rect�onandthethread guide should be fixed after fully moving it tothed�rect�onofthearrowmarkasshown�nthefigure in the longitudinal direction.

1 23

To align with the top surface of moving knife

To align the top surface of thread guide with the top surface of moving knife.

− 2� −

(7) Adjusting the knife pressure

�) Adjust the thread take-up lever to its lower dead po�nt,andactuatethesoleno�dvalvebyhandtomakethestatethatthethreadtr�mm�ngcyl�nder�sdrawn.

(Press the manual switch of solenoid valve No.3tomakethestateoflock.Referto"(12)Explanationofthesolenoidvalve".)

2) Keeping the state of �), slowly turn the handwheel byhand,andadjustthed�stanceofRsect�onofthemov�ngkn�feandtheendofmach�nebedtothepos�t�onof29to30mm.


3) Loosenmov�ngkn�fesetscrews1andt�ghtenthemaga�nafteradjust�ngthekn�fepressure.

4) Release the manual switch of solenoid valve that has been actuated in (�) – �). (Refer to "(12)Explanationofthesolenoidvalve".)

*1 : When the knife pressure is low, tighten moving knife setscrews 1 while lightly pressing the moving knife to the counter knife. When the knife pressure is high, worn-out or damage of the blade section will be caused . So, adjust the knife pressure as low as possible.

*2 : When thread cannot be cut even when the knife pressure is increased, change the height of moving knife or counter knife within the range of adjustment and adjust so that the blade sections meet together. The height of moving knife and counter knife should be a clearance of 0.5 to 0.6 mm between the knife and the bottom surface of throat plate.

29.0

to 3

0.0

mm

2.4 mm


37.8 mm

26.8 mm29 mm

Thickness : 0.6 mm

43 mm

9 m

m

1

− 22 −

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

1) Tilt the sewing machine and actuate the solenoid valve by hand in the state that the thread trimming cam roller is not entered the cam groove to make the state that the thread trimming cylinder is pushed out.

(Press the manual switch of solenoid valve No. 4 to make the state of lock. Refer to "(12) Explanation of the solenoid valve".)

2) Loosen setscrew 1 for the leaf spring (asm.) to remove leaf spring (asm.) 2.

3) Loosen moving knife return plate setscrews 3 and remove moving knife return plate 4.

4) Loosen moving knife drive arm stopper nut 5 and loosen moving knife drive arm stopper screw 6.

5) Loosen moving knife drive arm clamping screw 7.6) Adjust the clearance between the thread trimming

cam roller and the periphery of thread trimming cam to 0.05 to 0.15 mm, and adjust moving knife 8 to the initial position.

The initial position of moving knife is the position where the distance between the top end of moving knife and the machine bed is 26.8 ± 0.1 mm.

(At this time, the gauge for adjustment supplied as accessories can be used.)

7) Keeping the state of 6), tighten moving knife drive arm clamping screw 7.

(Tightening torque : 5.9 to 6.9 N•m) At this time, for the vertical direction of moving

knife drive arm, both ends of the bottom surface of moving knife drive arm and the lower end of moving knife shaft align with each other.

To be continued to (8) – 2 Adjusting the clearance between the moving knife drive arm and the moving knife drive arm stopper

Clearance between the periphery of thread trimming cam and the thread trimming cam roller is 0.05 to 0.15 mm.

26.8

± 0

.1 m

m

26.8 ± 0.1 mm

8

Top surface of machine bed

Groove section of slide plate

2.4 mm


37.8 mm

26.8 mm29 mm

Thickness : 0.6 mm

43 mm

9 m

m

8

1

24

3

5 6 7

− 23 −

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

1) Maintaining the clearance of 0.05 to 0.15 mm between the thread trimming cam roller and the periphery of thread trimming cam, adjust moving knife drive arm stopper screw 1 to make a clearance of 0.05 to 0.1 mm between the moving knife drive arm and the moving knife drive arm stopper, and tighten it with moving knife drive arm stopper nut 2.

To be continued to (8) – 3. Installing position of the moving knife return plate

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

1) Maintaining the clearance of 0.05 to 0.1 mm between the moving knife drive arm and the moving knife drive arm stopper, make the moving knife return plate come in contact with the return pin and fix it with moving knife return plate setscrew 1.

2) Secure the leaf spring (asm. ) with setscrew 2 with its top end aligned with the center of the moving knife returning plate.

3) Release the manual switch of solenoid valve that has been actuated in (8) – 1- 1. (Refer to "(12) Explanation of the solenoid valve".)

Clearance between the moving knife drive arm and the moving knife drive arm stopper is 0.05 to 0.1 mm.

Moving knife return plate aligns with the returning pin. (Contact)

When the machine lock has occurred during thread trimming operation, confirm whether or not the adjustment values of (8)-1 to 3 are proper. When they are not proper, it is necessary to perform re-adjustment.

12

1

Align the top end of the leaf spring with the center of the moving knife returning plate.

2

− 24 −

(9) Adjusting the thread trimming cam timing

�) Loosen thread trimming cam setscrews 1andt�ghtenthemaga�nafteradjust�ngthepos�t�onofthreadtr�mm�ngcam2.

2) Thepos�t�onofthreadtr�mm�ngcam�sthepos�t�onwherethreadtr�mm�ngcamroller3comes�ncontactw�thRsect�onwhere�tstartsenter�ngthecamgroovewhenthepos�t�onofhandwheel�satLengravedmarkerl�ne.

Confirmation:Makesureagainofthepositionof

L engraved marker line and R section where the roller starts entering the cam groove after fixingthethreadtrimmingcam.

1

2

3

Close contact

Pointer on handwheel

Scale on handwheel

− 25 −

(10) Installing position of the clamp spring

�) When the moving knife is at the initial position, loosenclampspr�ngsetscrews1,maketheclampspr�ngcome�ncontactw�ththemov�ngkn�feandt�ghten�tw�thclampscrewsetscrews1.(T�ghten�ngtorque:0.2to0.3N•m)

Thed�stancebetweentheclampspr�ngandtheend of machine bed becomes 43.0 to 43.5 mm.


Atthet�meofadjustment,becarefulofthecontactoftheclampspr�ngandthehook,andthecontactoftheclampspr�ngandthemov�ngkn�fewhen�tmovesto�tsforwardtravelend.

* When using the clamp spring for optional thin thread, adjust the adjustment value to 43.5 mmandfixtheclampspringwhilemakingit strongly come in contact with the side of moving knife.

1

43.0

to 4

3.5

mm

Be careful of the contact of clamp spring and moving knife when it moves to its forward travel end.

Move of moving knife

When there is a clearance between the clamp spring and the moving knife at the initial position of moving knife, bobbin thread cannot be clamped after thread trimming.

2.4 mm


37.8 mm

26.8 mm29 mm

Thickness : 0.6 mm

43 mm

9 m

m

23

* Whenthepos�t�onoftheclampspr�ngcannotbeadjustedevenclampspr�ngsetscrews1areloosened,loosenclampspr�ngbasesetscrews2andmoveclampspr�ngbase3 to the operator's s�detoadjust.

(Thepos�t�on�nvert�cald�rect�onoftheclampspr�ngbasehastobeplacedtothehookshaftbase.Therefore,t�ghtentheclampspr�ngbasew�thsetscrews2wh�lel�ghtlypress�ng�t�ndownwardd�rect�on.

− 26 −

(11) Adjusting the condensation amount

�) Loosen lock nut 3ofreversefeedcyl�nderknucklejo�nt2.

2) Adjusttheclearancebetweenthetopendofreversefeedcyl�nderrod1andtheendofreversefeedcyl�nderknucklejo�nt2referr�ngtothestandardofthetable.(It�sposs�bletoadjustbyturn�ngrod1.)

3) Aftertheadjustment,t�ghtenlocknut3.

Confirmation: 1. Perform the thread trimming sewing in

practice.2. Confirmthatthecondensationamount(pitch

before one stitch of thread trimming) is proper ( * ) in accordance with the sewing conditions.

* The length of thread remaining on the cloth side is shortened by decreasing the condensation amount. When the amount is excessively decreased, however, the cloth is tore by the seams and the stitch skips. As a result, thread trimming trouble occurs.

In addition, when the amount is excessively increased, thread-handling trouble occurs. As a result, thread trimming trouble occurs.

Condensation amount of 1.5 to 2 mm is recommended.

1

3

2

Condensat�onamount

(Standard)

D�mens�onA��.5 mm �.5 mm�2.0 mm 2.0mm

A

− 2� −

(12) Explanation of the solenoid valve

1Condensat�on2 BT3Threadtr�mm�ngON(Cyl�nder�sdrawn.)4Threadtr�mm�ngOFF(Cyl�nder�spushedout.)5Threadclamp(Cyl�nder�spushedout.)

7 AK (Presser foot rises.)8 AK (Presser foot lowers.)9DL(Cyl�nder�spushedout.)B(C) 2P

�) By pressing the switch (green) inside the cover, thesoleno�dvalvecanbeactuatedbyhand.

2) By turning the switch in the direction of the arrow markwh�lepress�ng�t,�t�sposs�bletolock.

By turning the switch in the reverse direction of thearrowmark,�t�sposs�bletoreleasethelock.

* WhenturningONthepower,confirmthatallcovers of the solenoid valve are closed.

(Under the state that the manual switch is locked, the covers are not closed and it is possible to prevent the malfunction of the solenoid valve.)

With regard to the switch of solenoid valve (Manual)

B

C

57 3 1

8 9 4 2

8

9 4 2

B

C

7 5 3 1

− 28 −

28. SEWING SPEED TABLE

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

1

The maximum sewing speed has been specified in accordance with sewing conditions as shown in the table below.Setthemax�mumsew�ngspeedappropr�ately�naccordancew�ththesew�ngcond�t�onsg�ventak�ngcare not to exceed the corresponding specified value.

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

�) When stitch length is 6 mm or less, the max. speed hastobetheupperl�m�tvalueorlowerl�m�tvalue.

2) When stitch length is more than 6 mm and 9 mmorless

Rev

olut

ions

per

min

ute

(rpm

)

Amount of alternate vertical movement of walking foot and presser foot (mm)

4000350030002500200015001000

5000

1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5

The l�ft�ngamountof thepresser footand thewalk�ngfoot �s adjusted us�ng d�al1.Turn the d�al clockw�seto �ncrease the l�ft�ng amount or counterclockw�se todecrease�t.

Amountofalternatevert�calmovementofwalk�ngfoot

andpresserfoot

Revolut�onsperm�nute

� to 6.5 mm 2000rpm

29. RESETTING THE SAFETY CLUTCH

The safety clutch funct�ons when an excess�ve load�sappl�edtothehookortheothercomponentsdur�ngsew�ng.Wh�lethesafetyclutch�ffunct�on�ng,thehookw�llneverrotateeven�fturn�ngthehandwheel.�) Reset the safety clutch with the sewing machine

t�lted.2) F�tscrewdr�ver(med�um)2suppl�edw�ththe

mach�neasanaccessory�nholeA�nsafetyclutchbush�ng1.

3) Hold�ngscrewdr�ver2byhandtopreventsafetyclutchbush�ng1fromrotat�ng,turnthehandwheel�nthereversed�rect�onofrotat�on.

4) The resetting procedure completes when the handwheelcl�cks.

A

1

2


Upper limit value

Lower limit value

− 29 −

1 One-touch type reverse feed switch • Wh�lethemach�ne�s�noperat�on,themach�ne

performsreversefeedst�tch�ngaslongasth�ssw�tch�sheldpressed,andresumesnormalfeedst�tch�ngwhenthesw�tch�sreleased.

• Ifth�ssw�tch�spressedwh�lethemach�ne�satrest,thefeedw�llbesettothereversefeedstate.(Thesew�ngmach�nedoesnotrun.)

If�t�sreleased,thefeedw�llreturntothenormalfeedstate.

30. OPERATION SWITCHES

31 2 4 6

2 Alternating vertical movement amount change-over switch Ifth�ssw�tch�spressedtheamountofthealternat�ngvert�calmovementofthewalk�ngfootandthepresser

footw�llbemax�m�zed.(Lampabovethesw�tchl�ghtsup) Useth�ssw�tchwhenamult�layeredport�onofthesew�ngproduct�snotsmoothlyfed. When performing the alternating vertical movement amount change-over with the knee switch, fix the

kneesw�tchsuppl�edw�ththemach�neonthetablew�thwoodscrewsanduse�t.Forthew�r�ng,referto“INSTRUCTION MANUAL (SUPPLEMENT) for sewing machines for leather and heavy-weight materials”.

3 Automatic reverse feed stitching cancellation/addition switch • If this switch is pressed when the following automatic reverse feed stitching has been specified, the reverse

stitching will not take place (for once immediately after it is pressed). (Example �) • If this switch is pressed when no automatic reverse feed stitching has been specified, the reverse feed

st�tch�ngw�lltakeplace(once�mmed�atelyafter�t�spressed).(Example2)

(Example 1) In the case where both automatic reverse feed stitching for start and that for end have beenspecified:

(Example 2) In the case where neither automatic reverse feed stitching for start nor that for end havebeenspecified:

If the sw�tch �s pressed before start�ngsew�ng, theautomat�creversefeedst�tch�ngforstart (between A and B) will not be carried out.

If the sw�tch �s pressed dur�ng sew�ng, theautomat�creversefeedst�tch�ngforend(betweenCandD)w�llnotbecarr�edout.

If the sw�tch �s pressed before start�ngsew�ng, theautomat�creversefeedst�tch�ngforstart (between A and B) will be carried out.

If the sw�tch �s pressed dur�ng sew�ng, theautomat�creversefeedst�tch�ngforend(betweenCandD)w�llbecarr�edout.

5

AB

CD

A B

CD

CD

AB

CD

AB

− 30 −

4 Needle lifting switch Ifth�ssw�tch�spressed,themach�new�lltravelfromtheneedle-downstoppos�t�ontotheneedle-upstop

pos�t�on.

When raising the machine head which has been tilted, do not hold the operation switch to raise it.

5 2P switch Ifth�ssw�tch�spressed,thest�tchlength�s

changedovertothatofthescaleonthefeedadjust�ngd�al.(Lamp�nthebutton�sl�tup.)

Be sure to make the number of 2P feed adjusting dial less than that of the standard feed adjusting dial.

Example

¡ Standard feed adjusting dial scale : 9

¡ 2P feed adjusting dial scale : 6

¡ If this switch is pressed, stitch length is changed over from 9 to 6.

\OFF ON

¡ If this switch is pressed again, stitch length returns from 6 to 9.

− 3� −

1

31. KNEE SWITCH

If knee sw�tch 1 �s pressed, the amount of thealternat�ng vert�cal movement of the walk�ng foot andthe presser foot w�ll be max�m�zed. (Samew�th theperformance carr�ed out by press�ng the alternat�ngvert�calmovementamount change-over sw�tch “ ”onthemach�nehead.)

The knee switch can be used as the presser lifting switch by setting of the motor. (When the switch is used as the presser lifting switch, the function as the alternating vertical movement amount changeover switch is lost.)For the details, refer to the Instruction Manual (Supplement) for SC-510.

6 Needle thread clamp switch Whentheneedlethreadclampsw�tch�sturned

ON,theneedlethreadclampmot�on�sperformedatthestartofsew�ng,andwhen�t�sturnedOFF,theneedlethreadclampmot�on�snotperformed.

However,theneedlethreadclampdev�ceaswellasthepresserfootl�ft�ngmot�ondoesnotfunct�onunt�lthethreadtr�mm�ng�sperformedafterturn�ngONthepower.

Inadd�t�on,whenthepresserfoot�sl�ftedafterthreadtr�mm�ngmot�on,theneedlethread�sclampedw�ththeneedlethreadclampdev�ce,butwhentheneedlethreadclampsw�tch�sturnedOFF,theneedlethread�sreleased.

Needle thread clamp switch can be set to effective or ineffective by setting of the motor.For the details, refer to the Instruction Manual (Supplement) for SC-510.

ON OFF

32. CAUTIONS WITH REGARD TO THE SEWING OPERATION

�. Be sure to perform the sewing operation after confirming that the needle bar position (needle UP stop pos�t�on/needleDOWNstoppos�t�on)whenthesew�ngmach�nestops�sproperlypos�t�oned.

(For the setting of the designation of needle bar position, refer to the Instruction Manual (supplement) for SC-5�0.)2. Perform a trial sewing and confirm the finished state of sewing since the state at the start of sewing is

d�fferentfromthatattheendofsew�ng�naccordancew�ththesewnproduct(mater�alandthread).3. Whenus�ngtheneedlethreadclampdev�ce,use�ttogetherw�ththereversefeedst�tch�ngatthestartofsew�ng.4. Be sure to perform the thread trimming motion on the cloth.

− 32 −

33. TROUBLES IN SEWING AND CORRECTIVE MEASURES

Troubles Causes Correct�vemeasures

�. Thread breakage(Threadfraysor�swornout.)

(Needlethreadtra�ls2to3cmfromthewrongs�deofthefabr�c.)

1Threadpath,needlepo�nt,hookbladepo�ntorbobb�ncaserest�nggrooveonthethroatplatehassharpedgesorburrs.2Needlethreadtens�on�stooh�gh.3 Bobbin case opening lever prov�desanexcess�veclearanceatthebobb�ncase.

4Needlecomes�ncontactw�ththebladepo�ntofhook.5Amountofo�l�nthehook�stoosmall.

6Needlethreadtens�on�stoolow.7Threadtake-upspr�ngworksexcess�velyorthestrokeofthespr�ng�stoosmall.8T�m�ngbetweentheneedleandthehook�sexcess�velyadvancedorretarded.

藺 Removethesharpedgesorburrsonthe blade point of hook using a fine emery paper. Buff up the bobbin case resting grooveonthethroatplate.藺 Decreasetheneedlethreadtens�on.藺 Decreasetheclearanceprov�dedbetweenthebobb�ncaseopen�ngleverandthebobb�n.Referto“25. ADJUSTING THE

BOBBIN CASE OPENING LEVER.”藺Referto“23. NEEDLE-TO-HOOK

RELATION.”藺 Adjusttheamountofo�l�nthehookproperly.See“16. ADJUSTING THE

AMOUNT OF OIL IN THE HOOK.”藺 Increasetheneedlethreadtens�on.藺 Decreasethetens�onofthespr�ngand�ncreasethestrokeofthespr�ng.

藺Referto“23. NEEDLE-TO-HOOK RELATION.”

2.St�tchsk�pp�ng 1T�m�ngbetweentheneedleandthehook�sexcess�velyadvancedorretarded.2Pressure of the presser foot is too low.3Theclearanceprov�dedbetweenthetopendoftheneedleeyeletandthebladepo�ntofhook�snotcorrect.4Hookneedleguard�snotfunct�onal.

5Impropertypeofneedle�sused.

藺Referto“23. NEEDLE-TO-HOOK RELATION.”

藺T�ghtenthepresserspr�ngregulator.藺Referto“23. NEEDLE-TO-HOOK

RELATION.”

藺Referto“24. ADJUSTING THE HOOK NEEDLE GUARD.”

藺Replacetheneedlew�thonewh�ch�sth�ckerthanthecurrentneedlebyonecount.

3.Loosest�tches 1 Bobbin thread does not pass through thetens�onspr�ngofthe�nnerhook.2Threadpathhasbeenpoorly finished.3 Bobbin fails to move smoothly.

4 Bobbin case opening lever provides toomuchclearanceatthebobb�n.5Needlethreadtens�on�stoolow.6 Bobbin thread tension is too low.7 Bobbin has been wound too tightly.

8Thread�sth�ck.

9Thread supply�ng amount of threadtake-uplever�sexcess�velylarge.

藺 Threadthebobb�nthreadcorrectly.

藺 Remove rough parts with a fine emery paperorbuff�tup.藺 Replacethebobb�norhookw�thanew

one.藺Referto“25. ADJUSTING THE BOBBIN

CASE OPENING LEVER.”藺 Increasetheneedlethreadtens�on.藺 Increasethebobb�nthreadtens�on.藺 Decreasethetens�onappl�edtothebobb�n

w�nder.藺 Replacethefeeddogw�thoneforth�ck

thread.藺 Remove the pre-tens�on of needle thread

clampdev�ce.藺 Increasetheneedlecount.藺 Move the thread take-up threadgu�de to

the r�ght s�de to decrease the supply�ngamountbythethreadtake-uplever.

− 33 −

Troubles Causes Corrective measures

4. Thread slips off the needle eyeletsimultaneously withthread trimming.

1 Thread tension given by the tension controller No. 1 is too

high.

藺 Decrease the thread tension given by the tension controller No. 1.

5. Thread slips off theneedle eyelet at thestart of sewing.

1 Thread tension given by the tension controller No. 1 is too

high.2 Clamp spring has improper

shape.3 Bobbin thread tension is too low.

藺 Decrease the thread tension given by the tension controller No. 1.藺 Replace the clamp spring with a new one

or correct the current one.藺 Increase the bobbin thread tension.

6. Defective sharpness at the time of threadtrimming.

1 The blades of moving knife andcounter knife have been

improperly adjusted.2 The knives have blunt blades.

3 Needle thread tension is too low.4 Bobbin thread tension is too low.

藺 Refer to “26. ADJUSTING THE THREAD TRIMMING MECHANISM COMPONENTS”.

藺 Replace the moving knife and counter knife with new ones, or correct the current

ones.藺 Increase the needle thread tension.藺 Increase the bobbin thread tension.

7. Thread is nottrimmed.

1 Initial position of the movingknife has been improperlyadjusted.

2 Bobbin thread tension is too low.3 Position of the thread guide is improper.4 Torque at the time of cutting thick thread is insufficient.

藺 Refer to “Adjusting the initial position ofthe knife” in the Engineer’s Manual.

藺 Increase the bobbin thread tension.藺 Refer to “26. (6) Thread guide installing

position.”藺When using thick thread equivalent to #4

or #5, delay the UP stop position. Refer to "Function No. 112" of the

Instruction Manual for SC-510.

8. Thread breaks at thestart of sewing afterthread trimming.

1 The needle thread is caught inthe hook.

藺 Shorten the length of thread remainingon the needle after thread trimming.Refer to “19. THREAD TENSION.”

9. Stitch skipping occursat the start of sewingafter thread trimming.

1 Bobbin thread is not clamped after thread trimming.

2 Position of the thread guide is not proper.

3 Number of revolutions is too fastand needle thread cannot catchbobbin thread.

4 Bobbin thread tension is too low.

藺 Check again the installing position ofclamp spring.

藺 When thread is thin, replace the clampspring with one for thin thread.

藺 Refer to “26. (6) Thread guide installing position.”

藺 Increase the number of stitches of softstart at the setting of motor.

Refer to "Instruction Manual for SC-510".藺 Increase the bobbin thread tension.

lu-2220n-7 instruction manual （english）...tank n the bed from lubr cat on hole 1 unt l h level 3...

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