[GreenKeys] Wanted - An optical 8-level paper tape reader assembly

[W2HX]

There are a ton on ebay. Here are a few and a search to find more.

http://www.ebay.com/itm/OKUMA-OSP-TAPE-READER-2702C-PULLED-FROM-LC-10-/150772937536?pt=LH_DefaultDomain_0&hash=item231ac47340

http://www.ebay.com/itm/SANYO-2702-TAPE-READER-/311190147475?pt=BI_Control_Systems_PLCs&hash=item487460d193

search:
http://www.ebay.com/sch/Business-Industrial-/12576/i.html?_from=R40&_nkw=tape+reader

there are tons. You may need to pull out just the parts you need.

-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of acti at provide.net
Sent: Thursday, November 27, 2014 1:33 AM
To: Greenkeys at mailman.qth.net
Subject: [GreenKeys] Wanted - An optical 8-level paper tape reader assembly

There used to be simple optical reader bars for 8-level paper tape consisting of a row of 9 photo-transistors in a squared-O clip frame. It was typically illuminated by a long bar 12v automobile dome lamp bulb.

I need some of those, for a project.
Are those reader bars still available anywhere?
If so, can someone give me a link to one?

They were a common item during the 1980's.
It allowed a very simple micro to read punched paper tape simply by yanking it through the assembly.

Interfacing them was easy - two chips (an 8-bit latch, and a flip-flop) and a trigger debounce circuit.  The smaller sprocket hole photo-transistor triggers the latch to grab the data, and raises an interrupt flip-flop.  The micro clears the interrupt flop once it read the byte.

I could probably design and fab a frame for a row of opto-interrupters to do this job, but for precision and speed I'd rather just buy a pre-made assembly IF that's still possible.
(I still have to make the interface...)

Are those optical reader bars still available anywhere? If so, where?

Thanks!
- Keith Mc.

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