JUKI MO-6904S - Maintenance; Adjusting the knife; Cleaning the machine head

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7.MAINTENANCE
7-1.Adjustingtheknife
To adjust the extent of cutting uff at the overedged
edge of the material :
1) Loosen setscrew
❶
. Tighten the setscrew with
lower knife
❷
pressed to the left.
2) Loosen setscrew
❸
. Move upper knife as far as
needed and secure with the setscrew
❹
.
3) Lower the upper knife to its lower end position.
Loosen setscrew
❶
to adjust so that the lower
knife comes in contact with the upper knife, then
tighten setscrew
❶
.
 1. Besuretotightenscrew
❶
before oper-
atingmachine.
2. After the completion of adjustment,
maketheknivescutathreadtocheck
forsharpnessoftheknives.
CAUTION :
• Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthe
followingworkafterturningthepoweroffandascertainingthatthemotorisatrest.
• Toprotectagainstpossiblepersonalinjury,nevertouchthebladeoftheknifewithngersand
hands.
• Topreventpossibleaccidentscausedbyinexperiencedpersonsandthoseresultingfrom
maladjustment,adjustmentworkshouldonlybecarriedoutbymaintenancepersonnelwhohave
receivedsafetytrainingandarefamiliarwiththesewingmachine.
Clear lint from inside the looper cover and the needle
bar and components about once or twice a day. If
not, oil may leak the sewing material will be soiled.
Donotwipethecoatedsurfaceofthema-
chineheadwithlacquerthinner.Doingso
willdamagethecoatedsurface.
7-2.Cleaningthemachinehead
CAUTION :
Toprotectagainstpossiblepersonalinjuryduetoabruptstartofthemachine,besuretostartthe
followingworkafterturningthepoweroffandascertainingthatthemotorisatrest.
❷
❶
❹
❸