Thread Tension/Take-Up Spring; Hand Lifter; Presser Foot Pressure - JUKI DDL-5550-6 Instruction Manual

High-speed 1-needle lockstitch machine with automatic thread trimmer
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1. Adjusting the needle thread tension
1) As you turn thread tension No. I nut O clockwise (in
'
direction @ ). the thread remaining on the needle after
thread trimming will be shorter.
2) As you turn nut O
counterclockwise (in direction
@ 1 . t h e t h r e a d l e n g t h w i l l b e l o n g e r .
3) As vou turn thread tension No. I nut O clockwise (in
'
direction O ). the needle thread tension rvill be
i n c r e a s e d .
4) As you turn nut O
counterclockwise (in direction
O
), the needle thread tension will be decreased.
2. Adjusting the bobbin thread tension
1) As you tr:f
tension adjust screw @ clockwise (in
direction € t. the bobbin thread tension will be
increase d.
2) As you turn screw @ counterclockwise (in direction
O ), the bobbin thread tension will be decreased.
.''.l...?i;,,'
1. Changing the stroke of thread take-up spring O
l)
Loosen setscrew (O
2) As you turn tension post O
clockwise (in direction
6 ), t!. stroke of the thread take-up spring will be
lncrease o.
3) As you turn the knob counterclockwise (in direction
@ ), the stroke will be decreased.
2. Changing the pressure of thread take-up spring O
1) Loosen setscrew O , and remove tension post @ '
2) Loosen setscrew @
3) As you turn tension post @ clockwise (in direction
@ ), the pressure will be increased.
4) As you turn the post counterclockwise (in direction
@ ), the pressure will be decreased.
l )
2)
r )
4)
To stop the machine with its presser foot up, turn hand
lifter Q in direction @
The presser foot will go up about 5.5 mm and stop.
The presser foot will go back to its original position
when hand lifter is turned down in direction @ .
Using the knee lifter, you can get the standard presser
foot lift of about 10 mm and the maximum lift of about
1 3 m m .
14. PRESSER TFOOT PRE$,$URE .' '' : i .
Loosen nut @ . As you turn presser spring regulator O
clockwise (in direction @ ), the presser foot pressure
will be increased.
As you turn the presser spring regulator counter-
clockwise (in direction @ ), the pressure will be
decreased.
After adjustment, tighten nut €)
1 )
2)
3)
4)
For general fabrics, the standard height
spring regulator is 29 to 32 mm (5kg,1
DDL.sss0H-6).
of the presser
(7kg for the

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