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Posted (edited)

I also find these old, special and simple mechanical designs intriguing.

This Rotoscillo makes use of larger oiled internal surfaces to transfer the load, and I think it should be better than a round cam against a plane surface.

The German Köhler engineers may have been inspired by the Free sewing machine, because both machines use the Rotoscillo, but they do also  use rods and bearings to produce the needle bar motion and motion of take-up lever. Other long shuttle machines typically use special machined cams for that. The needle bar makes two dips each stitch. Later on in the video about the Free machine you can see this mechanic. This video show the similar mechanics in the Köhler machine:
 

 

Edited by Gymnast
Posted

Thanks for those videos - for some reason I missed the original video in this post, but it was very interesting seeing it now!

  • 2 months later...
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On 8/17/2021 at 2:09 PM, DonInReno said:

Thanks for those videos - for some reason I missed the original video in this post, but it was very interesting seeing it now!

This is a mathematician with some interesting points about these Reuleaux Triangles - so if you like to see this for fun:

 

 

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