Prediction System of Loads to Cut an Object by Scissors

In order to assess the cutting performance of the scissors, we must predict the cutting force acting on fingers when we use the scissors. The total force acting on scissors is the sum of the load to cut the object and the blade friction load. The former consists of the loads to shear the object and to bend slightly it, both of which are acting together on the fingers by the lever mechanism through the rotation center connecting two blades as the fulcrum. We have developed and examined the prediction system of the total cutting force. With regard to three kinds of scissors, we have got the correlation coefficient greater than 0.9 between the predicted values and the experimental ones.