参考になるかもしれないやつ（en）
"Introduction to Linkages"by geogebra Author:Professor McCarthy
Linkage simulation (diy walker.com)
Lecture notes by John Hayes
MIT open courseware Geometric Folding Algorithms: Linkages, Origami, Polyhedra
Digital Mechanism and Gear Library
https://www.maths.ed.ac.uk/~csangwin/howroundcom/front.html
Arglin Kampling's documents