[GreenKeys] Odd Model 15 gears

[Sheldon Daitch]

Way back, maybe the early 1970s, the AP increased the operating speed of
the M-15 and M-20 machines.

One of our forum members posted an AP document detailing the step-by-step
instructions so the subcribers could change the mainshaft and motor 
gears hopefully
without the assistance of the AP techs.

I don't have access to any of the documentation that I used way back when I
really did get a pay check from the AP, but I think the speed bumped up 
from 60WPM
to 66WPM or thereabouts.

The AP used the same gear combination for both the M15 and M20 machines, 
no doubt
to minimize the gear and motor combinations in the field.  Since the M20 
machine is a
six-level coding, the actual data rate for the M20 is slightly higher, 
as one more information
pulse is required for each machine function, even though the main shaft 
speeds are the
same.

I just don't remember the PCB for the M20.  Maybe I just didn't pay any 
attention to it,
but forgive me, it has only been 33 years since I saw a M20 TTY.

73
Sheldon

On 5/31/2011 5:41 AM, DR HOUSE wrote:
> Yes Jim,
>
> The same gears are on my AP M20.  I think they are to run the machine
> at a faster speed, how fast I do not know.
>
> I have not been able to find a reference for these gears, nor has
> Riceguy.
> Another odd thing about this M20 is the printed circuit board that feeds
> the selector mechanism.
>
> Someone out there that worked for AP might be able to help us.
>
> Don
>
> On 30 May 2011, at 8:54 PM, Jim Haynes wrote:
>
> I have a former Associated Press Model 15 with sync motor.  The motor
> pinion is 114460 and the driven gear is 114461.  I haven't found these
> in any of my parts books or gear charts.  Anybody know what they are?
>
>
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