JUKI LK-1900B series Engineer's Manual

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Adjustment procedures Results of Improper adjustment
1. If the thread on Side
B
cannot be cut, grind Side
C
. If the thread
on Side
C
cannot be cut, grind Side
B
.
(Caution) When grinding the side, make the angle more acuter
than 90 degrees.
o
 Whenlessthan0.2mm:
 ThreadonSide
C
cannot be
cut.
o
 Whenmorethan0.2mm:
 ThreadonSide
B
cannot be
cut.
Adjustment procedures Results of Improper adjustment
1.Turnoffthepowersupplyandlookforanyclosecontactbetween
theATsolenoid
❶
and the thrust collar
❷
.
2. Loosen the three setscrews
❸
and remove the thread tension
cap
❹
.
3.Holdthetensionreleasingpinadjustcollar
❺
not to let it rotate,
and loosen the nut
❻
.
4.Turnthetensionreleasingpinadjustcollar
❺
andadjustthegap
between the thread tension discs
❼
.(Adjustmentofthreadten-
siondiscoating)
5.Holdthetensionreleasingpinadjustcollar
❺
and tighten the nut
❻
. Mount the thread tension cap
❹
bymeansofthesetscrew
❸
.
6.Turnonthepowersupplyandsetupthethreadtension.Conrm
that the thread tension discs
❼
are closed.
o
 Iftheamountofdiscoating
is too less, the residual thread
length can be changed or short-
ened when the thread is thick.
o
 Iftheamountofdiscoating
is too much, the tension discs
cannotclosecompletelyand
normalthreadtensionmayfailto
bechosen.Thiscanbeacause
of imperfect sewing.
Secure an acute angle.

JUKI LK-1900B series Specifications

General

Brand	JUKI
Model	LK-1900B series
Category	Sewing Machine
Language	English