Subject:
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Re: Looking for a one-way motor drive mechanism that is foolproof.
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 1 Feb 2005 14:42:07 GMT
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Viewed:
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3027 times
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On Tue, 1 Feb 2005 11:49:19 GMT, Brian Davis <brdavis@iusb.edu> wrote:
> In lugnet.technic, Geoffrey Hyde wrote:
>
> > I want to drive a conveyor belt which will be feeding items from a hopper,
> > however, I want to make a small mechanism which will, if the motor is
> > switched on with it's output shaft spinning in the wrong direction,
> > automatically turn the spin around to the right direction through a
> > reversing gear arrangement.
>
> Off the top of my head I can think of two ways, neither completely compact.
> One is to use the sliding worm gear trick, and take the two outputs and connect
> them to the belt in such a way so that if output A is engaged it drives the belt
> forward, while if output B is engaged it... drives the belt forward. This has
> the downside if gearing down a lot, but it should work. You could also do this
> with a differential rachet splitter and a torque-limiting gear or two, but it
> would be bulkier.
Here http://www.baumfamily.org/lego/creations/dirtrans/ is one
compact arrangement using the sliding worm gear that should do the
trick. Just connect the output shafts with two 16t gears and I think
they will work the way you want...or if one is still going backwards,
use three 8t (one idler) to change the direction...(worm gears always
always confuse me...)
-Rob A>
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