Advancing material of indeterminate length – With material-responsive control means – To regulate longitudinal movement of material
Patent
1998-07-07
1999-06-29
Mansen, Michael
Advancing material of indeterminate length
With material-responsive control means
To regulate longitudinal movement of material
226 42, 226100, B65H 2318
Patent
active
059156120
ABSTRACT:
An apparatus is disclosed for controlling the motion of a machine system so as to cut individual lengths from a web having graphics on predetermined web positions and which allows the use of an inexpensive AC induction motor. An AC induction motor has an output power shaft for imparting the motive force necessary to drive the machine system, such as a web feeding system. A sensor is operatively coupled to the AC motor for determining the position of the motor during system operation. A controller is operatively connected to the sensor and motor and forms a closed loop control circuit. The controller changes the feedback loop characteristics of the closed loop control circuit during a stop, hold or start condition of the motor. By adding an externally generated compensating signal to the input of the feedback loop, the controller also minimizes acceleration error. The controller also limits the value of a signal reaching the feedback loop of the control circuit to a given maximum value so as to eliminate any over-reaction of the system, while allowing a signal having less than a given threshold value to proceed unaffected to the feedback loop.
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Mansen Michael
Trine Manufacturing Company, Inc.
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