JUKI LK-1900B series - Page 37

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Procedures of assembling
1.Applyaproperamountofgrease(JUKIGreaseA)tothegroovedcamblockofthecam
❶
, the periph-
eral cam block, and the rollers of the work clamp foot lifter link
❽
and the thread trimmer link
❾
. Refer
to "10.-(4) Parts to which grease is applied".
2. While the cam
❶
is being inserted in the shaft of the work clamp foot lifting motor
❻
, mount the assem-
blyonthesewingmachineframeandtightenthefoursetscrews
❺
.Theinsertionofthecamshouldbe
donegentlyinordernottohurtthebearing
❼
.
3. Clearance B toward the work clamp foot lifter link
❽
and Clearance A toward the thread trimmer link
❾
shouldbeequallydistributed.Forthispurpose,adjustthepositionofthecam
❶
andxitwiththeuse
of the two setscrews
❷
.(Applythescrewstotheatsectionatbothendsoftheshaft.)
 * IfitisdifculttoexamineClearanceB,ClearanceAshouldbeadjustedto0.5to0.7mmduring
assembly.
4. Mount the sensor slit
❸
with the two setscrews
❹
sothattheendplaneofthemotorshaftcanapproxi-
matelycoincidewiththatofthesensorslit
❸
.(Jointheatsectionforinstallation.)
 * Conrmthattheslitplateofthesensorslit
❸
does not interfere with the work clamp foot lifter sen-
sor.
5.Referto"3.-(12)Threadtrimmer/workclampfootoriginsensoradjustment"andmakesensoradjust-
ments.
Adjustment procedures Results of Improper adjustment
1. Start the check program 06.
2.Treadonthepedalfortheretrievalofthethreadtrimmer/work
clamp foot lifter (cam) origin.
3. Using a bar
❹
orthelike,conrmthatthestandardholes
A
and
B
of the sewing machine frame coincide with the standard hole
C
of the thread trimmer and work clamp foot lifter cam
❶
.
4. If the standard hole
C
of the thread trimmer/work clamp foot lifter
cam
❶
staysintheupper
E
direction, loosen the setscrew
❷
to move the sensor mounting plate
❸
in the lower
D
direction
andthenxit.Ifthestandardhole
C
of the thread trimmer/work
clamp foot lifter cam
❶
staysinthelower
D
direction, loosen the
setscrew
❷
to move the sensor mounting plate
❸
in the upper
E
directionandthenxit.Afterthesensormountingplate
❸
has
beenxed,pushthestartswitchfortheretrievalofthethread
trimmer/workclampfootlifter(cam)origintoconrmwhetherthe
standard holes coincide with each other.
5. Repeat the above steps 2. to 4. until the coincidence is con-
rmed.
(Caution) Conrm that there is no mutual interference between
the sensor slit plate
❺
and the sensor before tighten-
ing the setscrew
❷
.
o
If there is no coincidence of the
standard holes, such a condition
is regarded as a thread trimmer
timingerror.Thiscanbeacause
of trouble in thread trimmer or
unthreading at the beginning of
sewing.