Thread Tension; Thread Take-Up Spring; Adjusting The Thread Take-Up Stroke - JUKI DDL-8700A-7 Instruction Manual

17. thread tension

1
B
A
2
C
D

18. thread take-up spring

1
A
B
3

19. adjusting the thread take-up stroke

WarNING :
Be sure to turn the power oFF before the following work in order to prevent personal injury due to
unintentional starting of the sewing machine.
A B
E
F
3
4
5
2
1
1
C
(1) adjusting the needle thread tension
) The length of thread remanng at the needle
tp after thread trmmng s shortened by turn-
ng tenson regulatng nut No.  1 clockwse n
drecton A .
2) It s lengthened by turnng the nut counterclock-
wse n drecton B .
3) The needle thread tenson s ncreased by turn-
ng tenson regulatng nut No. 2 2 clockwse n
drecton C .
4) It s decreased by turnng the nut counterclock-
wse n drecton D .
(2) adjusting the bobbin thread tension
) The bobbn thread tenson s ncreased by turn-
ng tenson regulatng screw 3 clockwse n
drecton E .
2) It s decreased by turnng the screw counter-
clockwse n drecton F .
(1) changing the stroke of thread take-up
spring 1
) Loosen setscrew 2 .
2) As you turn tenson post 3 clockwse (n drec-
ton A ), the stroke of the thread take-up sprng
wll be ncreased.
3) As you turn the knob counterclockwse (n drec-
ton B ), the stroke wll be decreased.
(2) changing the pressure of thread take-up
spring 1
) Loosen setscrew 2 , and remove tenson post 3 .
2) Loosen setscrew 4 .
3) As you turn tenson post 3 clockwse (n drec-
ton A ), the pressure wll be ncreased.
4) As you turn the tenson post counterclockwse (n
drecton B ), the pressure wll be decreased.
) When sewng heavy-weght materals, move
thread gude 1 to the left (n drecton A ) to
ncrease the length of thread pulled out by the
thread take-up.
2) When sewng lght-weght materals, move
thread gude 1 to the rght (n drecton B ) to
decrease the length of thread pulled out by the
thread take-up.
3) Normally, thread gude 1 s postoned n a way
that marker lne C s algned wth the center of
the screw.
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