JUKI lbh-1790 series Engineer's Manual page 19

Adjustment Procedures
1. Press MODE key 4
adjustment mode.
with ITEM SELECTION key !0
2. Select K51
READY key 2
.
3. Every time ITEM SELECTION key ! 0
four positions as shown in the figure are repeatedly moved
and can be changed over in order.
4. To change the set value, move the state to the position you
desire to set, and set the value with DATA CHANGE key ! 1
.
(1) Thread trimming position
1) Longitudinal position of the trimmer at the time of
trimming can be changed.
Locus of the trimmer in terms of needle thread scarcely
changes and the position of trimmer after trimming only
changes. When needle thread is missed, adjust it with
"6) Longitudinal and lateral adjustment of the needle
thread trimmer (at the time of trimming)".
(2) Thread holding position
1) Fine adjustment of the longitudinal position of trimmer
at the start of sewing can be performed.
(3) Thread release position
1) Escape amount of the trimmer can be adjusted.
Adjust the opening amount of trimmer with "7) Opening
amount of the needle thread trimmer".
(4) Waiting position
1) Trimmer waits before trimming thread after it is opened.
The longitudinal position can be adjusted.
5. When READY key 2
performed from any position and the position moves to the
origin position.
6. When RESET key 3
set values are memorized in EEPROM of the machine head
and the needle thread trimming adjustment mode is completed.
to enter memory switch level 2 of the
is pressed, the
is pressed, origin retrieval can be
is pressed, the respective moving
14
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Results of Improper Adjustment
and press
™ Thread trimming position
When the number is excessively
increased, the needle thread
trimming cam groove end comes
in contact with the roller, and
step-out of needle thread
trimming motor may occur.
™ Thread release position
When the number is excessively
decreased (minus number is
increased), the needle thread
trimming cam groove end comes
in contact with the roller, and
step-out of needle thread
trimming motor may occur.
™ Waiting position
When the number is excessively
decreased, the latch comes off
during sewing, trimmer and
needle collide with each other,
and needle breakage or trimmer
breakage may occur.
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