KH- 830 NEEDLE SELECTION
ME
CHANISM
Fig. A
Fig. B
-6-
. -
• In the IQf- 830 needle selection mechanism, when the needle is
moved
downward
by
the needle select
or
c.am attached to the car-
rbge
, the c
ard
rea
der
in
th
e
posi
t
ion
of
open
hole In the punched
card moves up. When the card reader moves
up.
the
card reader
is
forced to the left
by
the rotary
cam
, thus ca
us.lng
the c
ii'C!
ligna!
lever {which is
coupl
ed
to
the
car
d reader)
to
mo~e
.
Thus,
the
card
sipal
lever causes the needle selector pl
ate
to
the rigltt,
and
the needle shunk is caught
by
the
book
of
th
e needle selector
plate. This keeps the needle forced down, and
th
e need
le
is led
to
the D position by
th
e separation cam.
On
the needle which
Is
n
ot
positioned
in
an open hole,
th
e card
reader does
not
move
up,
and u a result, the needle cannot be
held down (in
oth
er words,
it
n>tums
to
the home position even
if
held down}, it
is
pushed back
to
the B position by the separation
earn attached
to
the
carriage.
MaiP
body
I)
If
there
Is
an
open hole,
the
card rea
der
ia.mo
ve
d
up
by
the spring.
2) The
card reader
is
moved
to
the
left
by
the needle selector cam.
3)
The
si
gnal lever
is
moved to the left
by
the
card reader.
4)
The signal lever pivots
upon
A (see Fig. A), and t
he
needle
sel
ector
plate moves
to
the
righ
t.
5)
The
needle selector plate
in
this posit
ion
is
moved
to
the right
until
it
catc
hes
the
needle shunk, t
hu
s keeping
th
e needle
fo
rced
do
wn
.
6)
Wh
en
there is no hole, the needle
se
lector plate does
not
move,
and
as
a resu
lt,
the needie returns
to
the home position from
where
It
is
held down.
eama.
Since the needle positioned
in
an
open hole
lJ
under the needle
select
or
plate, it is carried
to
the D position through
the
separa-
tio
n earn.
Th
e needle which is
no
t positio
ne
d
in
an open hole
is
immediate·
ly forced b:u:k
to
the
home
position from
the
pocltlon where
it
is
held, it operat
es
at
A (see
Fi
g. B) and forced back
to
B.
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