Positioned based motor tuning for a guillotine cutter mechanism

Abstract

A method for improved tuning of servo motors used to drive guillotine cutters on a high speed inserter machine. The tuning coefficient is continuously varied during the blade's cutting cycle. In a first step of the tuning process, a plurality of discrete positions in the blade cycle are selected for analysis of the optimal tuning coefficients. For these discrete positions, tuning coefficients are determined. After the tuning coefficients have been determined for the discrete locations in the blade cycle, the coefficients for the remainder of the blade cycle are determined through interpolation. In a preferred embodiment, linear interpolation is used. A digital filter then applies the measured and interpolated coefficients to the amplifier that controls the motor. In the preferred embodiment, the step of selecting the discrete positions includes selecting 90 degrees, 180 degrees, 270 degrees, and 360 degrees in a guillotine blade cycle. These four positions roughly correspond to peaks and valleys in the coefficients needed to work with the varying torques that are required over the blade cycle. By testing for the proper coefficients at those four discrete quadrant positions, the appropriate bases for linear interpolation are achieved.

Dependencies are inferred from the claim text.