SWING-ARM QUICK-RETURN Mechanism 51028
Swing-arm quick-return mechanism, drawn as Fig, converts rotary motion into nonuniform reciprocating motion. As drive link AB rotates 360° around pin A, it causes the slider at B to reciprocate up and down along link CD. This, in turn, causes CD to oscillate left and right, describing an arc. Link DE, pinned to D with a rolling slider pinned at E, moves slowly to the right before being returned rapidly to the left.
Video Link: http://youtu.be/nZCSvbuVU6E