Disk 1 rotates about a fixed axis coinciding with its centre. Pin a, fastened on disk 1, alternately engages the straight portions b of link 2 and q of link 3. Links 2 and 3 turn about fixed axes A and B. Link 2 has gear segment e which meshes with gear segment f of link 3. The sizes of the links comply with the condition r₂=r₃, where r₂ and r₃ are the pitch radii of the gear segments of links 2 and 3. When disk 1 rotates counterclockwise, links 2 and 3 have oscillating motions with an amplitude of 180°. Blade d, attached to link 3 turns through the same angle.
$2409$LrG,4L$