该风选机是根据物料在空气动力与振动摩擦力的双重作用下产生比重偏析的原理，通过风压和振幅的调整，达到比重分离的目的。该机除了可以分离咖啡豆外，还可以去除小麦、玉米、薏仁米、水稻、各种其他豆类及其他杂粮中的秕籽、芽籽、虫蛀粒、病斑粒等比重较轻的杂质。

The principle of the winnowing machine is gravity segregation based on the aerodynamic and vibration friction. Under the dual role of the wind and amplitude adjustment, the machine can achieve the goal of specific gravity separation. This machine not only can separate the coffee beans, but also can remove the proportion of light impurities such as unripe seeds, bud seeds, bug eat  seeds, disease seeds  in the  wheat, corn, myotonin, paddy and other beans and grains.

LNF-1C咖啡脱壳去皮机是一种高效率咖啡加工组合设备，分为砻壳、脱皮、分离三个工序，可一次性把咖啡豆外果皮脱掉，并在吸糠风机作用下经过分离室将脱去的皮分离出。该机操作维修方便，性能稳定可靠，碎豆少，脱皮干净，广泛适用于中、小型咖啡加工厂或专业户，是一种比较理想的咖啡脱壳去皮设备。

LNF-1C shell peeled coffee machine is an efficient combination of coffee processing equipment. The machine is divided into the three processes of milling shell, peeling and separation. It can put coffee skin off in one pass. And the skin is separated with the roll of suction chaff blower. The machine has many virtues such as convenient to operate, stable and reliable performance, less broken beans and clean peeling. It is widely used in small and medium-sized coffee processing plant and specialized households. It is a relatively ideal coffee shell peeled equipment.