http://bit.do/dgzQg Buy Orpalis from the discount page.
The red input shaft may change rotation direction but the rotation direction of the cyan output gear shaft unchanged due to two spring clutches. One connects the red input shaft and the cyan output shaft. The other connects the yellow gear and the cyan output shaft. The yellow gear rotates free of the output shaft in absence of the orange spring. The spring helix direction is the key factor for this mechanism. STEP files for this mechanism are available at: http://www.mediafire.com/?ib29e1kzzu43trn
