JUKI HZL-NX7 Service Manual

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6-8 Timing between the needle and the hook
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Removethethroatplate,thebottomcoverA/Bandthebottomcoverofthefreearm.
Method for checking
 1.Checktobesurethattheneedleentrypointandneedlebarheightarecorrect.
 2.Selectthestraightstitch.Selecttherightneedlepositionbyusingthezigzagwidthadjustingdial.
(The needle entry point is shifted to the rightmost side.)
 3.Now,turnthehandwheelbyhandtobringtheneedlebartoitslowestdeadpoint.
 4.Turnthehandwheelfurthertograduallylifttheneedlebaruntilpoint
C
where the needle center is aligned
withthetipofbladepointofthehookisreached.
 5.Atthistime,checktobesurethatthedistance
D
fromthetipofbladepointofthehooktotheupperend
oftheneedleeyeis3.1to3.3mm.Ifthisdistanceisnotcorrectlyprovided,carryoutthefollowingadjust-
ment.
Adjustmentprocedure
 1.Loosenthesetscrewinthehookdrivinggearwhichisnotvisiblefromundersideofthesewingmachine
whentheneedlecenteralignswiththetipofbladepointofthehook.
2. Select the straight stitch and the right needle position. Move the hook driving gear in the rotational direc-
tiontoadjustdistance
D
of3.1to3.3mmisprovidedbetweenthetipofbladepointofthehookandthe
upperendoftheneedleeyewhentheneedlebarisliftedby1.6mmfromthelowestdeadpointbyturning
thehandwheelbyhand.
  Atthistime,thebacklashbetweenthehookdrivinggearandthegearonthehooksidemaychangede-
pendingonthelocationofthehookdrivinggearonthehookdrivingshaft.Adjustmentshould,therefore,
becarriedoutwiththevisiblesetscrewtemporarilytightened,whilecarefullyobservingthehookdriving
gearinboththerotationaldirectionandaxialdirection.Adjustthebacklashto0.2to0.7mmontheperiph-
ery of the rotating hook.
 3.Afterconrmingthetimingbetweentheneedleandhookiscorrectlyadjusted,securelytightenbothset-
screws.
(Caution) After adjustment of the hook, the hook race surface and the bobbin case holder may be stained
with dirt, oil or grease. Wipe them off with alcohol where necessary.
If those parts are left stained, chattering or thread slip-off noise of the bobbin case holder can
occur.
Distance D : 3.1 to 3.3 mm
1.6 mm
C
Backlash on the periphery of the
rotating hook 0.2 to 0.7 mm
Rotating
hook
Hook
driving
gear
Backlash
Larger
Smaller

JUKI HZL-NX7 Specifications

General

Brand	JUKI
Model	HZL-NX7
Category	Sewing Machine
Language	English