[GreenKeys] Interesting 8-level Reader

[Don Robert House]

Makes one wonder why Bell & Howell would be into this.

Don


On 1 Sep 2013, at 8:30 PM, Cory Heisterkamp wrote:

It's a physically contacting system, but rather interesting. Star- 
shaped 'feelers' ride on independent arms in the head- when there's a  
hole present, a leg of the star drops through, when there's not, the  
star rides up and the contact opens.  This way they can read a hole  
with the tape moving forward or back. These stars spin about an axis  
and I assume they fall into line pretty quick with a few nulls punched  
in the header.

-Cory

On Aug 31, 2013, at 12:34 PM, Don Robert House  
<62.5milliamps at gmail.com> wrote:

> Interesting that you mention "shed some light."
> Does the device use lamps and photocells?
> What does the reading mechanism look like.
>
> Don
> K9TTY
>
>
> On 30 Aug 2013, at 5:46 PM, Cory Heisterkamp wrote:
>
> Thought you guys might get a kick out of this, and maybe someone can  
> shed some light on its purpose. I picked it up since it's a  
> mechanical stepper and has physical contacts. There's a sticker on  
> the side marked "Bell & Howell" and it appears to be made by Tally.  
> Now here's the neat thing, there's a 'tape out' sensing switch on  
> BOTH sides of the reader head AND a differential with two solenoid  
> releases that allows you to step the tape both forward AND backward.  
> Pretty cool!  -Cory
> < 
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