The Timing Of Thread Spreader Against The Needle; Position Of The Thread Spreader Latch; The Timing Of The Needle Guard 1; Position Of The Needle Guard - JUKI MH-481 Instruction Manual

4) On thread spreader
E x t r e m e
right
e n d
'Thread spreader is necessary in case of
reverse sewing and at the same time it is very
important to obtain stable stitches without
slup-stitching in case of normal feed sewing.
The timing of thread spreader against the
needle
As shown in the figure, when the No. 4 mark
of the needle bar appears from the bottom of
the needle bar lower bushng, set the thread
spreader with the thread s ~ r e a d e r cam set
screw, as shown in the figire, so that the
thread spreader comes to extreme nght end.
Position of the thread spreader latch
When the pointed end of the descending needle arrives the level of upper surface of the looper,
adjust the thread spreader to the position shown by the figure.
1,
The right and left direction should be such that the inside surface of the thread spreader
thould match with the center of the needle.
2
Adjust so that the front and back dimension A should be 2 mm(5164") with the screw
03.
3
The he~pllt \lluuld be adjusted so that the clearance between the bottom surface of the
thread rpreader u i d the upper surface o i the looper t o be 0.2 mm(1/100") with the screw
(21.
lnslde llne I
~
Threa! spreader
Thread spreader
A
Needle
r-pp
Fp
Method of thread spreader
Ci;, When the thread spreader latch returns,
the tip of the thread spreader latch is
positively grasping the looper thread and
one side o f the needle thread loop until
the needle point enters the triangle of the
thread.
(3
After the needle point has entered the
triangle, the looper should release the
thread.
Above are the thread spreader adjustments
for both normal and reverse stitches t o
form correct st~tches.
5) Needle guard and loop guide
Set sue\; of
needle guard cam
The timing of the needle guard
The timing of the needle guard is determined
by lnatch~ng the first rcrew of the figure
with the flat part of the shaft.
Position of the needle guard
When the looper scoops u ! ~ the necdle thread,
:idjust so that the needle point lightly touches
the needle guard. Set ihr 11c1glir as high as
vossible t o about covti the needle thread
loop. Loosen ser (crews
1
' and
\z\
for thls
'tdjustment.
- -
A
Looper gdlde
A ' :
' -
\
Q l
Position of the looper guidc
?'he looper guidc .;l~ould bt: ~ n \ t ; ~ l I ~ d
d i
near
the looper as poss~hle \o that it will not
ioucll the looper. Adjuct it
so
that tht.
dimenhion :)f A \rill be about 0.2 -0.5 rnm
(11100"--1.'64"), and of 1 3 ti,
be
about
0.5
-
-
1.0 mnl (1 164"--3/64"3.
Dimension of
A
should be adjusted
by
loosening rcre\v I
and of B loosen screw
2
.