I'm trying to find references to this type of gearing -- are there alternate terms for it? This isn't the "Geneva Drive" I'm familiar with.
I see that it is a form of lantern/cage gear -- with an intermittent action. It doesn't have a the deterministic transmission usually seen in a gear set. There is a position of the cycloidal gear at which the lantern gear can bump back and forth.
Do you guys have links to any on line references for this gearing?
---I found this, which is sort of similar, but it is driven by the pinned gear, not the cycloidal toothed gear:
Geneva Size Limitations
Re: Geneva Size Limitations
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Last edited by JustinO on Tue Feb 26, 2013 3:43 am, edited 1 time in total.
Re: Geneva Size Limitations
Hi Justin:
When it comes to the world of "strange" gears, like geneva's, or inverted geneva's ( which is what mine are), there
is no real reference. Its all part of the gearing world where unique or strange forms enter the domain. In this type of gearing
here is no spec or right or wrong way, its always just a question of "Does this work?". If you search hard on the web youll find
any manner of strange mechanisms designed specifically to have features that match a particular need. Clocks are that way on steroids.
Many unique forms are out there, usually designed by an individual who needed an answer to a particular problem.
The greatest problem when discussing these is language, humans dont speak in a language that easily adapts to mechanisms, hence everyone tends to speak in abstracts, like looseness or deterministic engagement. But I digress... :)
The inverted geneva does have looseness in the capture point, mine less than most as I took the liberty of adding more cycloidal
tooth to mine. A true geneva doesnt, but neither is a true geneva a gear by tight definition, its more of a mechanism. Look at a true
geneva and youll see, as in your photo, that it has several parts, not just two gears, it has a separate locking layer which really is two more gears,
and they function as a 4 gear set really which we term a geneva mechanism, more so than a geneva "gear" set.
Im experimenting to see if I can do more to allow a better subset of such things.
Art
When it comes to the world of "strange" gears, like geneva's, or inverted geneva's ( which is what mine are), there
is no real reference. Its all part of the gearing world where unique or strange forms enter the domain. In this type of gearing
here is no spec or right or wrong way, its always just a question of "Does this work?". If you search hard on the web youll find
any manner of strange mechanisms designed specifically to have features that match a particular need. Clocks are that way on steroids.
Many unique forms are out there, usually designed by an individual who needed an answer to a particular problem.
The greatest problem when discussing these is language, humans dont speak in a language that easily adapts to mechanisms, hence everyone tends to speak in abstracts, like looseness or deterministic engagement. But I digress... :)
The inverted geneva does have looseness in the capture point, mine less than most as I took the liberty of adding more cycloidal
tooth to mine. A true geneva doesnt, but neither is a true geneva a gear by tight definition, its more of a mechanism. Look at a true
geneva and youll see, as in your photo, that it has several parts, not just two gears, it has a separate locking layer which really is two more gears,
and they function as a 4 gear set really which we term a geneva mechanism, more so than a geneva "gear" set.
Im experimenting to see if I can do more to allow a better subset of such things.
Art
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