Adjusting The Thread Release Mechanism; Adjusting The Disk-Rise; Adjusting The Thread Release Hook - JUKI MF-7500 series Instruction Manual

^. aDjuStING tHE tHrEaD rELEaSE MEcHaNISM

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.
*a
clearance between click and disk is 0.2 to 0.5 mm.
(5 places)
7
*a
6
8
9
5
!0
!1
1)
2)
3)
1)
4
2)
1
2
3
– 12 –

1. adjusting the disk-rise

Loosen setscrew 2 in adjustment cam 1 , turn
adjustment cam 1 and disk-rise plate 3 moves up
or down.
Adjust the clearance between the click section of
disk-rise plate 3 and thread tension disk 4 to 0.2
to 0.5 mm, and tighten setscrew 2 .
If the click section of disk-rise plate 3 comes in
contact with thread tension disk 4 , sewing trouble
will be caused. So, be careful.
2. adjusting the thread release
hook
Loosen setscrew 5 . Adjust so that the top end of
tension release rod 6 is spaced 35 ± 1 mm from
the top end of take-up thread guide 7 . Then,
tighten setscrew 5 .
Loosen setscrew 9 , move the position of thread
release hook 8 up or down, and the thread
remaining length at the start of sewing can be ad-
justed.
• 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 sew-
ing is increased.
• If stitch skipping occurs at the beginning of
sewing when using non-elastic thread, properly
adjust 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 .
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 sew-
ing is apt to occur.