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JUKI DDL-8000A Engineer's Manual

JUKI DDL-8000A
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– 50 –
Adjustment Procedure
Results of Improper Adjustment
4) Adjusting the knife unit
[1] For checking the knife unit
1. Check to make sure that the power switch is in the OFF state.
Remove the gauge (presser foot, throat plate and feed dog) from
around the needle.
2.Inthestandbystateofloopspreadingknife, the distance from
center of needle A to the tip of loop spreading knife is 5.5 to
6.5 mm. (Refer to Fig.1-a)
3. At the time of 2, the thread trimming drive arm gets contact
with the screw .
When there is a gap, loosen the screw and make the thread
trimming drive arm keep in contact with the screw to tighten
the screw . (Refer to the Fig. 1-b.)
4. The purpose of adjustment of the aligning position of loop
spreading knife and thread trimming knife (far end of the
hole in loop spreading knife and the tip of thread trimming
knife ) is to align the aforementioned aligning position with
center of needle A. (Refer to Fig.2)
* There is seldom an actual margin of adjustment because it is
used for the creak of the Phillips -head screw.
5. The amount of engagement between loop spreading knife and
thread trimming knife is S type : 2.0 ± 2.5 mm, H type : 2.5 to
3.0 mm as measured from center of needle A. (Refer to Fig.3)
○Beawarethat,ifthedistancebe-
tween loop spreading knife and
center of needle A is reduced,
thread loop is likely to interfere with
loop spreading knife .
* Refer to "3.-(11)-4)-[2]. Adjustment
of the knife unit" for how to adjust
it.
○Beawarethat,ifthealigningposi-
tion of the loop spreading knife and
the thread trimming knife does not
align with center of needle A, the
length of thread remaining on the
material after thread trimming will
be longer.
○Beaware that, if the amount of
engagement between them is in-
sufcient, faulty thread trimming
can occur.
Refer to "3.-(11)-4)-[2]. Adjustment
of the knife unit" for how to adjust
it.
○Theneedlethreadmaybetrimmed
excessively short in the case thread
which is likely to cause unstable
thread loop formation is used or
thread trimming is carried out at a
position where there is no material.

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JUKI DDL-8000A Specifications

General IconGeneral
Stitch TypeLockstitch
Motor TypeDirect-drive motor
Thread TrimmerAutomatic
Max. Stitch Length5mm
Needle Bar Stroke30.7mm
Lift of the Presser FootBy hand: 5.5mm, By knee: 13mm
Control PanelDigital
LubricationAutomatic

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