JUKI LK-1900B series - Page 39

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Adjustment procedures Results of Improper adjustment
1. Withthemachineinstopmode,removesixsetscrews
❶
of the
top cover, and take off top cover
❷
.
2. ApplyL-shapedwrench
❸
to socket bolt
❺
of clamp
❹
, and
loosen the socket bolt.
3. Push down L-shaped wrench
❸
to increase the lift of the work
clamp hoot, or pull it up to decrease the lift.
4. Aftertheadjustment,securelytightensocketbolt
❺
.
5. Iftherightandleftworkclampfeetarenotlevelled,loosenxing
screw
❼
andadjustthepositionoftheworkclampfootleversup-
port plate
❽
to level them.
(Caution) At this time, be careful not to cause work clamp foot
lever support plate
❽
to interfere with feed bracket
❾
.
If the work clamp foot levers support plate interferes
with the wiper, readjust the height of the wiper using
setscrew
󱢳
in the wiper installing base.
Adjustment procedures Results of Improper adjustment
1. Start the check program 06.
2.Treadonthepedaltoperformoriginretrievalforthethreadtrim-
mer/work clamp foot lifter (cam).
 (Conrmthattheoriginisinthecorrectposition.Then,proceed
totheproceduresshownbelow.Referto"3.-(12)Threadtrimmer/
workclampfootoriginsensoradjustment".)
3.PresstheminuskeyoftheDATACHANGEkey
❼
. Con-
rmthatthedisplay
❶
of the operation panel is changed over
from " " → " "whenthekeyispressedwithinthe
range of 6 to 8 times.
4.Ifthedisplaychangeoveroccursdeviatingfromtherangeof6
timesto8times,orifthedisplaychangeoverdoesnotoccurat
all, loosen the setscrew
❷
andmakeneadjustmentsofthesen-
sor slit
❸
in the directions of the arrow.
5. After the sensor slit
❸
hasbeenxed,treadonthepedaland
make origin retrieval for the thread trimmer/work clamp foot lifter
(cam).Examinethesensorchangeoverpositioninthesteps3.
and 4. above.
6. Repeat the steps 2. to 5. above until the coincidence is secured.
(Caution) During adjustments, check the clearances A, B,
and C of the sensor slit
❸
and the sensor
❺
. If the
clearances seem to be insufcient, use the setscrews
❷
and
❻
to correct the gradient. While taking this
action, continue to work on the steps above.
o
If the thread trimmer sensor
changeover takes place outside
therange,themovingknifemay
interferewiththeneedle.This
willbeacauseofinjuryorthe
breakage of parts.
o
If the thread trimmer sensor
changeover does not take place,
Error 305 occurs and the sewing
machine fails to start operating.
o
If the sensor slit
❸
has no clear-
ance against the sensor
❺
, this
can be a cause of destruction in
the sensor slit
❸
or the sensor
❺
.