Patent ID: 7980161
Filing Date: 2011-07-19
Classification: B26D,Y10T

Abstract:
1. The method of assessing when to change or sharpen a cutting blade of a paper cutter, comprising: operating the cutting blade using an electric motor that causes motion of the cutting blade; cutting paper due to the motion of the cutting blade; recording data about usage of the electric motor at least while cutting the paper; operating the cutting blade, without cutting any paper, but substantially performing the motion identical to that which is performed while cutting the paper; recording additional data about usage of the electric motor, while performing the substantially identical motion; and making a determination from the data and the additional data as to whether the cutting blade should be changed or sharpened, wherein making the determination comprises subtracting at least part of the additional data from the data collected while cutting the paper, to yield a difference wherein making the determination includes comparing the difference recently to the difference when the cutting blade was substantially less old, wherein the determination comprises forming a first digital to analog conversion plot for recently operating the cutting blade to cut paper, and forming a second digital to analog conversion plot for recently operating the cutting blade without cutting paper, and forming a third digital to analog conversion plot for previously operating the cutting blade to cut paper, and forming a fourth digital to analog conversion plot for previously operating the cutting blade without cutting paper.