[GreenKeys] Questions On 35-KSR

[Don Robert House]

Absolute gospel Jim,

I spent many hours changing platens on 28s and 35s. Sometimes
accompanied with a change of the typebox.  These days it would
be very handy to have one of those mod kits.

Best,
Don  K9TTY


On 28 Jan 2014, at 7:15 PM, Jim Haynes wrote:
>
You need to measure the distance between the sprocket feed pins from
one end of the platen to the other.

Up until the early 1960s the answer was easy.  The paper was 8 1/2"
wide including the perforated edges for sprocket feeding.  It had
been that way ever since the Model 15.  There were some narrower plates
available for other purposes, but 8 1/2" paper was the "normal" width.
And since the printing pitch is 10 to the inch, unless you got the
special parts for 12 to the inch, that gave a maximum line length of
about 75 characters.

If only we had a time machine and could go back and whisper in Sterling
Morton's ear about 1930 to make the platen wider.  Or in Walt Zenner's
ear when the 28 was in development.  Because in the 1960s we got  
customers
wanting to use 9 1/2" wide paper, so that it is 8 1/2" wide after the
strips containing the sprocket holes have been torn off.  First, so you
had a document you could file without having the ugly sprocket holes  
along
the edges.  Second because we were in the data processing era and IBM
punch cards held 80 characters, so you'd like to be able to print an
80 character line.

It turned out to be possible, so some 35s were made to take 9 1/2" wide
paper that is 8 1/2" wide after the sprocket hole strips have been torn
off.  And there was a set of parts to convert other machines to that
dimension.

I believe you can still get paper for either width, but the 9 1/2" paper
is a lot more common, perhaps is still used with dot matrix printers
where they still exist.
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