Gears question

[PEU]

Backlash here is not a problem because there is no back and forth movement, well unless the leather gets stuck and you need to backpedal...
I tought about a chain, but it would need to be crossing between the rollers because they need to turn in oposite directions.
But I will stick with gears, these are being used for more than a century and the machines still work.

What do you mean by involute? if you check the old machine photo the teeth seems to be wider moving away from the center.

Thanks

[JustinO]

The drive shaft with the crank handle, a pinion gear, and a small sprocket, would go CW.
The top roller with the chain drive would go CW.
The bottom roller with the gear drive would go CCW.
Because the rollers each are driven by the drive shaft, they can be swung toward and away from each other, pivoting around the drive shaft.


Involute vs cycloid. Involutes tolerate a little CtoC slop.

[PEU]

you lost me :) a photo of a hand drawing would help a lot!


Pablo

[JustinO]

The drive shaft has a gear and a sprocket and is rotating clockwise.
The upper roller has a sprocket and is rotating clockwise.
The lower roller has a gear and is rotating counter-clockwise.
The two rollers are rotating oppositely.
The chain and gear are always at optimal CtoC distance.

[PEU]

Justino.
Its a solution that complicates the build I think, the pendulum like movement of the small gear will make the build and hand cranking more difficult. I will stick with two gears and lousy engagement, in my last simulation I used module 5 and the engagement was reasonable.

In any case, thanks for the time you took to explain it.


Pablo

[JustinO]

Chances are really good that those old splitters were optimized.

[PEU]

what do you mean by optimized?