Patent ID: 8244393

Claim:
A computer-implemented method for registering a controlled web to an on-line pitched unit operation with a machine cycle, the controlled web comprising a plurality of pre-produced objects longitudinally spaced apart at a pitch interval, the method comprising: receiving one or more signals that represent a presence of each of the pre-produced objects; generating actual position bias data based, at least in part, on the signals, wherein the actual position bias data represent, for each of the pre-produced objects, an actual position of the pre-produced object relative to a machine cycle position of the pitched unit operation; generating a plurality of error signals that represent, for each of the pre-produced objects, a difference between a target position bias constant and the actual position bias data, wherein the target position bias constant represents a desired position of the pre-produced object relative to the machine cycle position of the pitched unit operation; generating an integral term, at least in part by summing the plurality of error signals; generating a correction signal, at least in part by summing the integral term and a proportional term; generating a gear ratio trim value by scaling the correction signal by a nominal gear ratio, wherein the nominal gear ratio is proportional to a translation of the controlled web over a corresponding translation of the pitched unit operation; and registering the controlled web to the pitched unit operation based, at least in part, on the gear ratio trim value; wherein the generating of the integral term includes generating the integral term that is proportional to the inverse of a target time constant expressed in pre-produced objects.