~+nn
~
:hll-~-ll:~
-
l:~PEEJ--f+"-H;;.V..{\OO.(Im
28
)
I The position
of
the
thread-am~unt
adjusting plate
~.
1?c:;:x.n
:;:x.~JJPJll1~1l~
!LJ3
..
rn
of
the thread take-up lever (Fig.28)
0028
Fig.28
#fftE:I&flf:.~at,
~ll(0028)JiJT~,
JlH:J~~ff~ihJJlit&~
ttm~.~n~•m~at.
m~~*~*o
Jltj~,
#ff1£RH!f:~B1,
-fft;fftft~oo~~*~1'FJff,
:iim-
1£RJff~$~RWB1,
@re~-~lit&~~:I&A~o
The thread-amount adjusting plate will retain the bobbin at
thread when the needle bar
is
the bottom dead centre; in such a way
the loop
of
the needle thread is to become bigger when the needle
thread
is
hooked. In addition to the foregoing there is afunction
of
the tight pulling
of
the needle thread loop. The thread-amount adju-
sting plate usually reduces to the lowest point when a thread finer
than normal
is
used.
Note that take-up thread tension lever
is
another name for thre-
ad-amount adjusting plate.
=+n,
~~iij~~~(m29)
I Frame thread eyelet (Fig.29)
0029
Fig.29
~oo~~~~m•-m*~~•tt~•~~.-•re~~m
W1'F~¥fl(0029)
till
~#8o-#so
till
~#30-#20
1-tH~#S0-#50
11:~f~#30-#20
~ral~~t~~Jlt2-3
~
ral~~~~Jlt3-4
~ral~~t~~Jltl-2
~ral~~t~~Jlt2-3
The improper-positioning
of
the frame thread eyelet my be the cause
of
occurrence
of
skipping stitch.
The following locations are generally regarded as criteria (refer to Fig29)
Cotton
thread#80~
#
50
Graduation marked on the frame thread eyelet 2-3
Cotton
thread#80~#50
Graduation marked on the frame thread eyelet 3-4
Thread
of
chemical fibre
#go~#
50
Thread
of
chemical fibre
#go~#
so
Graduation marked on the frame thread eyelet
1-2
Graduation marked on the frame thread eyelet 2-3
~
+·
/\,
fttitr.JiJJ~(m3o)
I Replacement of throat plate (Fig.30)
[!130
Fig.30
tt-Jttlii!Hl!
Stitich length
J;ttf.i!RfJLI¥-Jft;fitfj}~)\(ft~~~l/4"
(6.4mm)o
(0030)
t&~R~rallle:iim-lillat!f£~:
1,
tt~
2,
fflffijj!p
3,
tt
4,
:iiiM?f
5,
ml911?#ff
6,
:ffi:lll~tr:~ttfl:ltt~#t£1/8"
-I/2"##i~~zP-J~:iim
0
##i•lt*B1.~~~~#*ffi11~~-~fl:l8~~0
The sandard size
of
the throat plate
in
parts book, which
is
stipulated by the manufactory,
is
1/4", equivalent to 6.4mm. (Fig.30)
The replacement
of
the following components
is
ususlly needed
at the time when changing the gauge
of
double-row thread stitch.
-11-
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