[GreenKeys] Carriage return questions

[steve.n4tty at gmail.com]

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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