Thread Tension; Presser Foot Pressure - JUKI DDL-9000B Instruction Manual

10. THREAD TENSION

(1) Adjusting the needle thread tension
Turn thread tension No. 1 nut 1 clockwise (in direction A), to shorten the thread length remaining on the needle after thread trimming or counterclockwise (in
direction B), to lengthen the thread length.
2) Turn thread tension nut 2 clockwise (in direction C) to increase or counterclockwise (in direction D) to reduce the needle thread tension.
(2) Adjusting the bobbin thread tension
1) Turn tension adjusting screw 3 clockwise (in direction E) to increase or counterclockwise (in direction F) to reduce the bobbin thread tension.
11. WINDING THE
BOBBIN THREAD
1) Insert the bobbin deep into the bobbin winder spindle 1 until it will go no further.
2) Pass the bobbin thread pulled out from the spool rested on the right side of the thread stand following the order as shown in the figure on the left. Then, wind
clockwise the end of the bobbin thread on the bobbin several times.
(In case of the aluminum bobbin, after winding clockwise the end of the bobbin thread, wind counterclockwise the thread coming from the bobbin thread tension
several times to wind the bobbin thread with ease.)
3) Press the bobbin winder trip latch 2 in the direction of A and start the sewing machine. The bobbin rotates in the direction of C and the bobbin thread is wound
up. The bobbin winder spindle 1 automatically as soon as the winding is finished.
4) Remove the bobbin and cut the bobbin thread with the thread cut retainer 3 .
5) When adjusting the winding amount of the bobbin thread, loosen setscrew 4 and move bobbin winding lever 2 to the direction of A or B. Then tighten setscrew 4 .
To the direction of A : Decrease
To the direction of B : Increase
6) In case that the bobbin thread is not wound evenly on the bobbin, remove the handwheel, loosen screw 5 and adjust the height of bobbin thread tension 8 .
• It is the standard that the center of the bobbin is as high as the center of thread tension disk 6 .
• Adjust the position of thread tension disk 6 to the direction of D when the winding amount of the bobbin thread on the lower part of the bobbin is excessive and
to the direction E when the winding amount of the bobbin thread on the upper part of the bobbin is excessive.
After the adjustment, tighten screw 5 .
7) To adjust the tension of the bobbin winder, turn the thread tension nut 7 .
(Caution)
1. When winding the bobbin thread, start the winding in the state that the thread between the bobbin and thread tension disk 6 is tense.
2. When winding the bobbin thread in the state that sewing is not performed, remove the needle thread from the thread path of thread take-up and remove
the bobbin from the hook.
3. There is the possibility that the thread pulled out from the thread stand is loosened due to the influence (direction) of the wind and may be entangled in
the handwheel. Be careful of the direction of the wind.

12. PRESSER FOOT PRESSURE

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
1) Loosen nut 2 . As you turn presser spring regulator 1 clockwise (in direction A ), the presser foot pressure will be increased.
2) As you turn the presser spring regulator counter-clockwise (in direction B ), the pressure will be decreased.
3) After adjustment, tighten nut 2 .
The standard value of the addition C of the height of presser spring regulator is as follows :
• S type : 31.5 to 29 mm (Approximately 40 to 45N/4 to 4.5kg)
• H type : 31.5 to 28 mm (Approximately 50 to 60N/5 to 6kg)
• A type : 22 mm (Approximately 20N/2kg)
B
D
B 3
1
A
2
C
4
– 5 –
A
E
1
3
2
C
8
D
E
B A
1
C
2
F
6
7
6
5
6