[GreenKeys] Interesting 8-level Reader

[Cory Heisterkamp]

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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