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. The harvest is one of the most important activities in coffee crops; on the one hand, it provides employment opportunities for a large group of rural workers and on the other, it supplies mature fruits for the production of high quality coffee. In the present study, a device was designed and evaluated to assist in manual coffee harvesting, called Alfa, which employs a threetoothed blade beater, a DC motor powered by dry batteries and a system for receiving detached fruits. The research proceeded in two phases; in the first, the device was designed and built; in the second, an evaluation was carried out by using traditional manual collection as a comparison. The evaluations were developed in four locations: three experimental stations of Cenicafe and one private property. The variables studied were: number of fruits left on the ground after harvest, percentage of immature coffee in the harvested mass and yield. The device presented an operating time of four days without recharging, a weight less than four kg and an absence of technical failures; the operators had no problems with its use; and, in addition, it was possible to increase the yield of the operators by almost 70%; the percentage of immature coffee was between 4.5% and 3% and losses were between one and 19 fruits per site.  / Resumen. La cosecha es una de las actividades mas importantes en el cultivo de cafe; de un lado proporciona empleo a un amplio grupo de trabajadores rurales y de otro brinda frutos maduros que contribuyen a la obtencion de cafe de alta calidad. En la investigacion un equipo llamado Alfa fue disenado y evaluado para asistir la cosecha manual del cafe. El equipo consistio de un impactador de tres paletas dentadas, un motor DC accionado por baterias secas y un sistema para recibir los frutos desprendidos. La investigacion conto con dos fases; en la primera el equipo fue disenado y construido, en la segunda una evaluacion fue adelantada empleando como comparacion la recoleccion manual tradicional. Las evaluaciones se realizaron en cuatro localidades, tres centros experimentales de Cenicafe y una finca particular. Las variables en estudio fueron: numero de frutos dejados en el suelo luego de la cosecha, porcentaje de frutos verdes en el cafe cosechado y rendimiento. El equipo presento un tiempo de operacion de 4 dias sin recarga, el peso fue inferior a 4 kg y no se presentaron fallas tecnicas. Los operarios no manifestaron problemas con su uso y fue posible incrementar el rendimiento de los operarios hasta en 70%, el porcentaje de cafe verde estuvo entre 4,5 y 3% y perdidas entre 1 y 19 frutos por sitio.

A Portable Device to Assist in the Harvest of Coffee in Colombia