Members Gymnast Posted August 12, 2021 Author Members Report Posted August 12, 2021 (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 August 12, 2021 by Gymnast Quote Sewing Machines in Detail, YouTube channel
DonInReno Posted August 17, 2021 Report Posted August 17, 2021 Thanks for those videos - for some reason I missed the original video in this post, but it was very interesting seeing it now! Quote
Members Gymnast Posted October 23, 2021 Author Members Report Posted October 23, 2021 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: Quote Sewing Machines in Detail, YouTube channel
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