Juki LY3-6840-B0T Handleiding

Juki Naaimachine LY3-6840-B0T

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A181E095P01

SINGLE-NEEDLE LOCKSTITCH UPPER AND LOWER FEED

CYLINDER-BED INDUSTRIAL SEWING MACHINE

MODEL

LY3- -B0T 6840

PRECAUTION BEFORE STARTING OPERATION

1 Safety Precautions

1 . Whenturningthepoweron,keepyourhandsandngersawayfromtheareaaround/

undertheneedleandtheareaaroundthepulley.

2 . Thepowermustbeturnedo󱐯whenthemachineisnotused,orwhentheoperator

leaveshis/herseat.

3 . Thepowermustbeturnedo󱐯beforetiltingthemachinehead,installingorremoving

the“V”belt,adjustingthemachine,orreplacingparts.

4 . Avoidplacingngers,hairs,obstacles,etc.nearthepulley,“V”belt,bobbinwinder

wheel,ormotorwhenthemachineisinoperation.Injurycouldresult.

5 . Don’tputngersintothethreadtake-uplevercover,around/undertheneedle,or

pulleywhenthemachineisinoperation.

6 . Ifthebeltcover,thengerguard,and/ortheeyeguardareinstalled,don’toperate

themachinewithoutthesesafetydevices.

2 Precaution before Starting Operation

1 . Ifthemachine’soilpanhasanoilsump,neveroperatethemachinewithoutllingoil

init.

2 . Ifthemachineislubricatedbyadropoiler,neveroperatethemachinewithout

lubricating.

3 . Whenanewsewingmachineisoperated,verifytherotationaldirectionofthepulley

withthepoweron.

 (Thepulleyshouldrotatecounterclockwisewhenviewedfromthepulley.)

4 . Verifyvoltageand(singleorthree)phaseindicatedonthenameplateofthemotor.

3 Precaution for Operating Conditions

1 . Avoidusingthemachineatabnormallyhightemperature(35℃orhigher)orlow

temperature(5℃orlower).Otherwise,machinefailuremayresult.

2 . Avoidusingthemachineindustyconditions.

3 . Avoidusingthemachineinconditionslledwithalotofelectricnoisessuchashigh-

frequencywelders.

INTRODUCTION



Thank you very much for purchasing industrial sewing machine.

Please read this instruction manual before operating the sewing machine. Please read also

“Safety Manual”, “Instruction manual for LIMISERVO” and operate the sewing machine

correctly and safely.

CONTENTS

PREPARATION FOR OPERATION ……………………………………………… 1

1Installationofthesewingmachine………………………………………………… 1

2Adjustmentoftheneedlestoppingposition……………………………………… 1

USAGE PRECAUTION ……………………………………………… 2

1Installationofthekneelifter ……………………………………………………… 2

2Lubrication …………………………………………………………………………… 2

3Lubricationcondition………………………………………………………………… 2

4Adjustmentoflubricationtotherotatinghook ………………………………… 3

5Adjustmentoflubricationtotheuppershaft …………………………………… 3

6Periodicalcleaning…………………………………………………………………… 4

7Precautionforthebuilt-intypedetector ………………………………………… 4

8Installationofthebeltcover ……………………………………………………… 4

9Precautiononoperation …………………………………………………………… 4

HOW TO USE ……………………………………………… 5

1Installationoftheneedle …………………………………………………………… 5

2Windingofthebobbinthread……………………………………………………… 5

3Threadingoftheneedlethread …………………………………………………… 6

4Adjustmentoffeed(stitch)lengthandbackstitch……………………………… 6

5Balanceofthreadstension ………………………………………………………… 6

6Adjustmentoftheneedlethreadtension………………………………………… 7

7Adjustmentofthebobbinthreadtension………………………………………… 7

8Adjustmentofthepresserfootpressure………………………………………… 7

9Adjustmentofthefeeddogheight ……………………………………………… 8

:Thefeedbardeectionpreventiondevice ……………………………………… 8

AAdjustmentofforward/backwardstitchlength………………………………… 9

BManualPresserbarlifter…………………………………………………………… 9

CAdjustmentofthekneelifteroperatingforce…………………………………… 9

DAdjustmentofthefeedfootandthepresserfoot ……………………………… 10

EAdjustmentthefeedtiming(feedupper/lowerposition) …………………… 12

FAdjustmentofthefeedtiming …………………………………………………… 13

GAdjustmentofthefeeddog’sforward/backwardposition…………………… 13

HTherotatinghook,bobbincase,andbobbin……………………………………… 13

IAdjustmentofthegapbetweenthepulleyandthemachinehead…………… 13

ADDENDIX ……………………………………………… 14

Tableshape ……………………………………………………………………………… 14

SPECIFICATIONS ……………………………………………… 15

Product specificaties

Merk:	Juki
Categorie:	Naaimachine
Model:	LY3-6840-B0T

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