cosθ-cosθ' = const. exact straight line Linkage
New type exact straight line linkage invention.
■ θ' > 180° case result is interesting.
Vertical E trace line exists.
( If necessary, please mouse scroll wheel to get the smaller scaling.)
cf. Robert's linkage (Drag point D)
----- Robert's straight line linkage. It generates an approximate straight-line between the base.
--- i.e. this famous Robert is a non-exact straight line version.
■ Implementation sample (16 bars)
D and D'' are line-symmetric by bisector. ---- ①
and O and D' are line-symmetric by the same ①'s bisector ----- ②
So, we can make a linkage system to mapping from AD to A'O easily.
cf. cosθ-cosθ' = const. Bisector exact straight line
Sample (11 bars)
cf. cosθ-cosθ' = const. Bisector exact straight line #2