Input: pink crank.
Center of the pin on green satellite pinion traces an equilateral triangle of rounded vertices.
Yellow vertical bar translates following the said triangle thanks to violet slider of two prismatic joints.
Internal gear: tooth number: 60; module: 3 mm
Pinion: tooth number: 20; module: 3 mm
Length of the pinion crank: 16.5 mm
Length of the pink crank: 60 mm
To draw a complete equilateral triangle the pink crank rotates 1 revolution.
Time for tracing straight portion is nearly 1/3 of working period.

Classified list of 2100 videos in channel thang010146 (uploaded till 31 Dec. 2015) including pictures, brief descriptions and YouTube links:
2100 ANIMATED MECHANICAL MECHANISMS