mechanical logic mechanism 2

[subsearobot]

Howdy folks!
I'm looking for a mechanical EX-OR gate concept. preferably based on turning elements (gears). The inputs and outputs will be rotating elements, so simplicity seems to dictate rotational logic, but linkages might be possible if they solve the riddle. any ideas are welcome.

I've done some googling on the subject, but to this point there is so much noise, thought I'd turn to my community to see if anyone has ideas or experience.

it may not be practical; the mechanism would be used in a lightweight handheld device. but I'd like to explore options. if it can be made to function, it would be awesome.

cheers

 

[drawoh]

subsearobot,

EX-OR has no meaning without an obvious mechanism. I would be willing to design one for you if you define a scope of work...

...and pay me.

--
JHG

 

[goodguy1405]

Magic Words "Pay Me"

 

[IRstuff]

at a minimum, EXOR has no meaning without some description of what's being compared, torque, presence, speed?

TTFN
faq731-376

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Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[1gibson]

4 gears, in a diamond pattern. Input, A, B, output.

.......A
Input Output
.......B

Input touches A and B
A and B touch each other
Output touches A and B
Input DOES NOT touch output.

A and B are attached to spring loaded buttons, so pressing the button lifts the gear out of plane with the others.

A0 B0 locks all the gears together
A0 B1 lifts B, so input rotates A which rotates output
A1 B0 lifts A, so input rotates B which rotates output
A1 B1 lifts A and B, so input has no effect on output, they can both spin free.

The only inconsistency is that A0B0 is locked, and A1B1 is free. This could be solved with an additional spring on the output gear, that moves output out of plane, into a locking position against a pin in the case, when neither A or B are applied. The output spring would be lighter than the A or B springs, to avoid locked if one or both A/B are in 0 position.

It is much easier than it sounds, trust me.

 

[1gibson]

Spring on output locks it against a pin in the case when *BOTH* A and B are applied (A1 B1.) I typed neither.

It's always something, and I was doing so well...

 

[subsearobot]

1gibson, that's a good solution. I will fiddle with it a bit and see if it can apply.

IRstuff,
I am looking to compare and transmit rotational motion. (low torque, low speed)

 

[subsearobot]

I found this. for anyone who's curious:

http://randomwraith.com/rotxor.html

For my application, I may be able to get away with simply a subtraction gate.

 

[chicopee]

Good job on the truth table 1gibson. I have not done one of those for about 15 years which was for an entirely different application.

 

[1gibson]

Thanks, I have a lot of practice with them.

If you get the burger, I'll get the chicken, share some fries.
If you get a salad, I'll get the burger, we both pick a side.
etc...