[GreenKeys] [External] Re: modified teleprinter

[Gerry Block]

Harold you are of course describing the hp think jet Printer.   To simplify the initial product (which worked but barely) it used sprocket feed.
If you bought any hp test equipment with hpib you got a free Think jet printer.  That’s how it all got started.  
Gerry
AD6MC

Sent from my iPhone

> On Apr 4, 2022, at 9:15 AM, Harold Hallikainen via GreenKeys <greenkeys at mailman.qth.net> wrote:
> 
> 
> 
>> On Mon, April 4, 2022 4:11 am, Nick England wrote:
>> Teletype’s Inktronic used electrostatic deflection. 40 nozzles spraying
>> hot
>> liquid ink and 10kv……what could possibly go wrong?
>> https://www.navy-radio.com/tty/ugr14.htm
>> 
> 
> With an almost 12 kV differential, it must be fun to reach in there to
> clear paper jams.
> 
> Truly amazing technology. I'm still impressed with the heater boiling ink
> inkjet. It's amazing to me that it goes as fast as it does. Really clever
> design with very few moving parts. Probably the most complicated part is
> the paper feed. As I mentioned previously, I used to have a Multilith
> model 80 and a 1250 offset press. The 80 used a rubber roller to TRY to
> feed one sheet of paper into the press at a time. It often fed several.
> Most of the time, I ended up feeding it by hand. The 1250 had a vacuum
> pickup that would very nicely pick up one sheet of paper and feed it into
> the press. My HP inkjet does a nice job of feeding just one piece of paper
> through at a time. And, it can even flip the paper around to print on the
> other side. Of course, a tractor feed inkjet would be even simpler.
> Anyway, I think that's the most complicated part of the printer, though
> I'm sure the details of the print head are amazingly complex and cost a
> lot to develop.
> 
> Harold
> https://w6iwi.org
> 
> 
> -- 
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