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KH-
830 NEEDLE SELECTION MECHANISM
Fig.
A
Fig.
B
-6-
.
-
•
In the
IQf-
830
needle selection
mechanism,
when the needle is
moved
downward
by
the needle
selector
c.
a m
attached
t
o the car-
rbge,
the
card
reader
in
the
position 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
caus.lng
the
cii'C! ligna!
lever
{which
is
coupled
to the card
reader) to
mo~e.
Thus,
the
card
sipal
lever
causes
the needle selector
plate
to the
rigltt,
and
the
needle
shunk
is
caught by the
book of
the
needle selector
plate.
This
keeps the
needle
forced
down,
and
the
needle
is led to
the D
position
by
the
separation
cam.
On
the
needle
which
Is not positioned
in an
open
hole,
the
card
reader does not move
up, and
u a
result,
the
needle
cannot be
held
down
(in
other
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
reader
ia.moved up by
the
spring.
2) The card reader is moved
to the
left
by the needle
selector cam.
3)
The signal
lever
is
moved
to
the
left by the card
reader.
4)
The
signal
lever pivots
upon A (see
Fig.
A),
and
the needle
selector
plate
moves
to
the
right.
5) The needle selector
plate
in this
position is
moved
to the
right
until
it catches
the needle shunk, thus
keeping
the
needle
forced
down
.
6) When there is no
hole,
the needle selector
plate does not
move,
and as a result,
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
selector
plate,
it
is
carried
to
the D position
through
the
separa-
tion
earn.
The
needle which
is
not
positioned in
an
open hole
is immediate·
ly
forced
b:u:k
to
the home
position
from the pocltlon where it is
held,
it operates
at A
(see Fig.
B) and forced back
to
B.
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