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Main
Drum:
The Main Drurl
from
the
Touch
transmits
to
the
Sub
Dt um,
rJevers.
the patterns registered
I'
I
1
I
I
I
'
i
E
t
h
I
Sub
Drum:
The
Sub Drum memorizes
from
the
Touch Levers,
the
patterns
,
conveved
and
selects the
neeil
es
via
the
Main
Drum
accordingly.
Sub Drum
p
iece
Touch
Lever
(Scanninq Finqer
.
in a hole of
punch Ca;d)
Touch
f,eve-r
(Scann i
n9 Finger
hol rn a hole of
punch Card)
tj
.)
n
Main
Dtum
piece
Fig.
I
o
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