[GreenKeys] Carriage return questions

[steve.n4tty at gmail.com]

Interesting point!  The coiled spring in the drum of a 28 would cause travel of the carriage at the same speed independent of the WPM.  I never even had that cross my mind.  The Kleinschmidt's were controlled by the speed of the shafts, so they changed with gear speed changes.

Steve G./N4TTY

-----Original Message-----
From: Paul Heller <paul0926 at comcast.net> 
Sent: Friday, May 15, 2020 10:55 AM
To: steve.n4tty at gmail.com
Cc: Mike Dodd <mike at mdodd.com>; GreenKeys at mailman.qth.net
Subject: Re: [GreenKeys] Carriage return questions

The whole design has always fascinated me. I wonder how hard it was for them to perfect it.  It is pretty amazing that a model 28 can return fast enough when running at 100WPM. 

Paul
W2TTY

> On May 15, 2020, at 8:43 AM, steve.n4tty at gmail.com wrote:
> 
> Aren't they all "older" now?  😊
> 
> The 15/19 family used a coiled spring that retracted a belt attached to the carriage.  The 28 family also used a coiled spring in a drum that the wire that moved the type box carriage could return to the left margin rather quickly.  Both the 15.19 and 28 families had a dashpot that cushioned and slowed the return to a somewhat controlled stop.   The Kleinschmidt machines returned the carriage by using the main shaft through a set of clutches to actuate the return mechanism.
> 
> Hope that helps and others please jump in and correct any errors in my recollection of the 'older" machines by my older mind!
> 
> Steve G./N4TTY
> 
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net 
> <greenkeys-bounces at mailman.qth.net> On Behalf Of Mike Dodd
> Sent: Friday, May 15, 2020 10:09 AM
> To: greenkeys at mailman.qth.net
> Subject: [GreenKeys] Carriage return questions
> 
> Can someone refresh my memory about how the carriage in older TTYs and the type box in newer machines was moved to the start of a new line upon receipt of a CR character?
> 
> Was it a powered movement, or did a spring haul it back? Seems like it would have to be pretty quick -- perhaps only 0.28 seconds -- to get it moved before the next character after the CR LF sequence.
> 
> Just curious; it's been a long time since I saw one in action.
> 
> Thanks.
> 
> --- Mike N4CF
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