[GreenKeys] [External] Kleinschmidt 7302 ?

[David I. Emery]

On Fri, Jul 29, 2022 at 03:08:52AM +0000, Jones, Douglas W wrote:
> From: W2HX [w2hx at w2hx.com] -- Thursday, July 28, 2022 8:48 PM
> 
> > Any one ever come across this model? Looks like it is not dot matrix
> > https://teamequip.com/klein-schmidt-7302-tty-vintage-teleprinter-teletype-writer-t164225/
> 
> One of the photos shows some of the print on the paper on the platten.  Hover over the photo for a zoom-in view.  It's not dot matrix, unless it's 300 DPI, which is unlikely for a cloth-ribbon printer.  The letter forms look very much like classic Teletype letter forms, which suggests some kind of impact printing.  Chain printer?  Rubber band printer?  MITE style printer?  The photos make me think the print matrices are behind the page, with the hammer in front.  All of the technologies I just mentioned can be made to work that way.

	I once had (in the 70's) a military RO version of this... it had
a spinning drum behind the paper with 80 rows of columns of all the
characters in the character set the unit would print - a solenoid driven
printing hammer banged  the ribbon up against the paper as the desired
character was under it forming an impression of the typeface  behind the
paper.  The hammer and solenoid was mounted  on a carriage that moved
across the paper on rails...

	The version I had actually had two side by side hammers so it could
print two characters at a time, allowing it to print faster.

	At the time drum printers of this sort were common as high speed
line printers on computers of the era... most of them of course had 80
or 132 fixed hammers and solenoids (for 80 or 132 columns) and printed much
faster as a result, but the basic principle was the same for both.

	I believe mine came new in box in around 1974 or so from the
Honeywell surplus store in the Boston area as surplus from some custom
contract and was in a special configuration of some sort for that
service.


-- 
  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."