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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131620291,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Federico F Hahn, Edilberto S Poblano, Javier Hernández
Keywords:   roselle harvester nylamid gears roselle losses productivity.

Abstract. Roselle is a flower that is harvested by hand in many places of Mexico. Many machines have been implemented with electric and gasoline motors and they have in common the use of four rollers for pulling the branches full of roselle flowers. The type of motor presents contamination to the calyxes so now electric equipment is the one used. However, rollers lose their traction when water comes out from the branches. As the machines works continuously for 10 hours daily it does not perform well after the first hours. Four rollers were designed using nylamid and being machined like dented like gears throughout the entire roller. The harvester was evaluated with 6 different varieties and water extracted from the branches felt to the rollers groove resulting in a better traction. Calyx damage of 1 % was accounted and no flowers were broken during harvest. Its productivity reached 64 kg per hour for var. Nayarit and 62 kg per hour in var. Sudan.

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