JUKI MF-7200D/U45, Instruction Manual

Page: 58 / 260

– 17 –
&
. ADJUSTING THE THREAD RELEASE MECHANISM
1. Adjusting the disk-rise
1) Loosen setscrew
2
n adjustment cam
1
, turn
adjustment cam
1
and dsk-rse plate
3
moves
up or down.
2) Adjust the clearance between the clck secton of
dsk-rse plate
3
and thread tenson dsk
4
to 0.2
to 0.5 mm, and tghten setscrew
2
.
3) If the clck secton of dsk-rse plate
3
comes n
contact wth thread tenson dsk
4
, sewng trou-
ble wll be caused. So, be careful.
2. Adjusting the thread release hook
1) Loosen setscrew
5
, adjust the dmenson from
the top end of thread release rod
6
to the top
end of thread gude
7
to 33 to 36 mm, and tght-
en setscrew
5
.
2) Loosen setscrew
9
, move the poston of thread
release hook
8
up or down, and the thread re-
manng length at the start of sewng can be ad-
justed.
When the thread remaining length at the start
of sewing is short, stitch skipping or slip-off
of thread from needle eyelet at the start of
sewing is apt to occur.
• When the position of thread release hook
8
is
raised, the thread remaining length at the start of
sewing is decreased and when it is lowered, the
thread remaining length at the start of sewing is
increased.
• If stitch skipping occurs at the beginning of sew-
ing when using non-elastic thread, properly ad-
just the remaining length of top-covering thread
at the start of sewing using setscrew
!0
and
minimize the remaining length of looper thread at
the start of sewing using screw
!1
.
33
-
36 mm
*A
Clearance between click and disk is 0.2 to 0.5 mm.
(5 places)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest. In addition,
cut the air supply from air compressor. (UT45)
1
2
3
4
5
6
7
8
9
*A
!0
!1
– 14 –
ENGLISH
5. Adjusting the position of clamp pressure
adjusting spring
1) Loosen screws
9
and adjust the poston of
clamp pressure adjustng sprng
!2
so that the
dstance from the top end of clamp pressure ad-
justng sprng
!2
to secton A of upper knfe
!0
s
0.5 to 1 mm.
2) After the adjustment, tghten screws
9
.
6. Adjusting the pressure of clamp spring
1) Looper thread s held by clamp sprng
!1
after
thread trmmng.
2) Holdng pressure of the looper thread can be ad-
justed by turnng screw
8
.
3) When screw
8
s turned clockwse, the holdng
pressure s ncreased and turned counterclock-
wse, the pressure s decreased.
4) Make the holdng pressure as low as possble
wthn the range of holdng the looper thread.
4. Engaging the knives and adjusting the
clamp spring
1) Loosen screws
7
and
8
, and adjust the pos-
ton of upper knfe
!0
so that the engagement of
the upper knfe
!0
wth the lower knfe s 0.5 mm
when lower knfe
4
moves to the extreme rght.
2) At the same tme, adjust so that the dstance from
the top end of clamp sprng
!1
to that of lower
knfe
4
s 3.2 mm.
3) After the adjustment, tghten screws
7
.
3. Adjusting the Lower knife
1) Set lower knfe
4
and lower knfe holder
5
wth
setscrews
6
at the poston of the llustraton.
4
5
6
65.5 mm
0.5 mm
4
8
!0
7
9
!1 !2
3.2 mm
SectionA
0.5 - 1 mm