JUKI LK-1900B series - Page 41

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Adjustment procedures Results of Improper adjustment
1. Counter knife position
Loosen the counter knife setscrew
❶
toadjusttheposition.
2. Moving knife position
Loosen the screw
❷
toadjusttheposition.
o
If the clearance is less than 0.5
mm,threadmaybecutbythe
counter knife
❺
blade when the
thread is pulled with the moving
knife
❽
. In this case, upper and
lower threads are cut into short
pieces.
o
If the clearance is more than 0.5
mm, the residual thread length
after thread trimmer operation
becomes longer beneath the
work.
Adjustment procedures Results of Improper adjustment
1.Adjustmentoftheheightofthemovingknife
 Adjustmentsshouldbebasedontheplatethicknessofthewash-
er
❸
in the above illustration. If the height seems to be inade-
quate,selectandusethepartsasspeciedbelow.
PartNo. Nameofpart Thickness
B242328000A Moving knife washer 0.4 mm
B242328000B Moving knife washer 0.5 mm
B242328000C Moving knife washer 0.6 mm
B242328000D Moving knife washer 0.7 mm
B242328000E Moving knife washer 0.8 mm
B242328000F Moving knife washer F 0.65 mm
B242328000G MovingknifewasherG 0.75 mm
2.Adjustmentoftheheightofthecounterknife
 AdjusttheheightbypryingPart
A
with a screwdriver or the like.
o
If the step is too small (0.25 to 0.3
mm) between the moving knife
❽
and counter knife
❺
, trouble
inthreadtrimmermayoccur.
o
If the step is too large (0.1 to 0.15
mm) between the needle hole
guide
❻
and the counter knife
❺
,threadmaybecutbythe
counter knife
❺
blade when the
thread is pulled with the moving
knife
❽
. In this case, upper and
lower threads are cut into short
pieces.