[GreenKeys] GreenKeys Digest, Vol 102, Issue 29

[John Nagle]

    There's a mechanical device to turn off the motor
on some Teletypes.  I've seen it on Model 14 machines.
There's a leadscrew-like mechanism which advances as
the machine idles and resets on any non-idle character.
When it runs out, it opens a set of contacts to stop the motor.
A second set of contacts up near the selector closes when the
selector magnet releases the clutch, and starts the motor.

     The sending end starts by sending a BREAK
to wake up the other end, waits a few seconds for
the motor to come up to speed, and then starts sending.

     Later machines used various motor control relay arrangements.
There's a long series of patents in this area:

1,898,921 (uses a slow polar relay)
1,921,990 (multiple relays)
3.317,660 (uses a stepping switch)
				John Nagle

On 7/11/2012 6:20 PM, greenkeys-request at mailman.qth.net wrote:
> Message: 3
> Date: Thu, 12 Jul 2012 00:02:00 +0200
> From: "Nico de Jong"<nico at farumdata.dk>
> Subject: Re: [GreenKeys] ASR33 autostart
> To:<greenkeys at mailman.qth.net>
> Message-ID: <985D9072564F4D27BB63CE47AB776CB5 at udvikling>
> Content-Type: text/plain; format="flowed"; charset="iso-8859-1";
> 	reply-type="original"
>
> W7TTy wrote :
>> >Nico - - -
>> >
>> >You need a box commonly used in the days of yore called an "Idle
>> >Line Motor Control"....
>> >
> Thanks George and Jerry.
> Just what I need. Any idea why Teletype did not include such a function in
> the first place?