Six identical pulleys 4 rotate about symmetrically located fixed axes A. Flexible link 3 runs over pulleys 4. Two parallel straightedges 1 and 2 are attached at points K to link 3. When straightedge 1 travels with translational motion downwards, straightedge 2 travels with translational motion upwards, and their edges remain parallel to axis x-x.
$3546$CFL,ML$