-
20.
KNIVES AND OVEREDGE WIDTH
*
He~ght
of the lower knife
I
>e
,-TI
.iL',<
it.w and dtllust the helght
ot
lower kn~fe
0
SO
'I>\,
11,
zdg~
$\
tlush wlth thc throat plate \urtaie
*
Height of the upper knife
i..r\.;.
n
iriccrews
,
@
and perform adjustment so that upper
A:;:!.:
@
.)\trlaps lower kn~te
0
hy
0
5
to
I
rnrn
when the
Ili3ptsr
kn~:-
i,
dt
its lowert point
*
Overedge width
iheirdgt. \+!dths of
4.8
through
10
rnrn dre provided by
<!!-lnglilg ri~c parts or
by
uslng hubclaha r~~vdels. (The overedge
uidth
u~ii
he
slightly larger than the kn~fe cut width.)
Pi)
<,h
ingc
the overedge wldth.
1.
L.ooscnlng setscrew
@
,
push lower knife
0
to the left and
I1.x
It.
1
1.~1nsen setscrew
Q
and move upper knife
Q
as required.
tl~en i~u
it
3
Lllwcr the upper knife to its lowest point and Loosen set-
screw
@
.
Tighten setscrew
@
when the lower knife comes
In contact with the upper knife.
*
Resharpening the lower knife
When the lower knife has become dull, resharpen it as shown
in the figure left.
1
21.
NEEDLE
GUARD
I
~-
~p
-
-
-
-
*
For
1-Needle
and
2-Needle
Overlock Machines
An
overlock machine is equipped with
two
needle guards
0
and
@
.
I.
Position needle guard
0
so that it lightly comes in contact
w~th needle
0
when the blade point of lower looper
has
reached the center of needle
0
7
Position needle guard
@
so that it
is
1
mm lower than the
bottom surface of the throat plate
and
is distanced 0.1'mm
from needle
Q
when the needle is at its lowest point.
*
For
safety stitch machines
A
safety stitch machine has four needle guards
0
,
@
,
@
and
0
.
1
Position needle guards
0
and
in the same manner as the
overlock machne explained above.
2.
Position needle guard
0
so that it lightly comes in contact
with needle
@
,
and position needle guard
0
so that it is
distanced
0.1
mm from needleewhen the needle is at its
point
1
lowest point.
I
I
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