JUKI HZL-UX8 Series - Timing Belt Adjustment; Feed Timing Adjustment

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Setscrew No. 2
0.98 ± 0.29 N
Setscrew of the idler
mounting base
6-4 Timing belt
○
Remove the front panel and the main PCB.
Adjustmentprocedure
 1.Loosenthesetscrewintheidlermountingbaseandloosenthetimingbelt.
 2.Turnthehandwheeltobringtheneedlebartoitslowestdeadpoint.
 3.Turnthehookdrivingshafttobringthefeeddogtoitslowestdeadpoint.
 4.Carefullykeepingtheconditiondescribedinsteps2and3,setthetimingbeltonthehookdrivingshaft
pulley(bytemporarilytighteningthesetscrewintheidlermountingbase)sothatthesetscrewNo.2inthe
pulleyisbroughttojustundersideofthepulley.
 5.Applying0.98±0.29Nforcetotheidlerbymeansofaspringscale,securelytightenthesetscrew.
6-5 Feed timing
○
Aftercheckingthefeeddogheightandtheneedlebarheight,carryoutadjustmentofthefeedtiming.
Adjustmentprocedure
 1.AssembleaHA×1needle#14intotheneedlebar.
2. Loosen setscrew No. 2 in the hook driving shaft pulley.
 3.LoosensetscrewNo.1inthehookdrivingshaftpulley.Adjustthepulleysothatthelowerendofthe
needleeyeinthedescendingneedle#14isalignedwiththetopsurfaceofthethroatplatewhenthetop
surfaceofthedescendingfeeddogisalignedwiththetopsurfaceofthethroatplatebyturningthehand
wheeltowardyou.Afteradjustment,tightenthesetscrewNo.2.
 4.Turnthemainshaftbyonerevolutiontoconrmthetiming.
Setscrew No. 2
Setscrew No. 1
The lower end of the needle eye in needle
#14 aligns with or is 1 mm or less above
the top surface of the throat plate.
Top surface of the feed dog
aligns with the top surface
of the throat plate.