Advancing material of indeterminate length – With material-responsive control means – To position material laterally
Patent
1984-02-27
1987-03-10
Hornsby, Harvey C.
Advancing material of indeterminate length
With material-responsive control means
To position material laterally
226 21, B65H 23038
Patent
active
046485392
ABSTRACT:
A control device for guiding edges or a centerline of a material web which moves over rollers utilizes the difference between a desired position value and an actual position value, which actual position value is multiplied by a signal corresponding to the speed of the material web. A control signal is generated which is applied to a control element to reposition the web to obtain the desired positions for the edges or centerline. To make the control hunting-free, the error signal, formed of the actual value measured at a predetermined location, and the desired value is multiplied by the speed of the web and is delivered to a first control circuit for stabilization. A second control circuit, subordinate to the first, is provided between the output of an integrator and the correcting element and this second circuit comprises a position controller for the correcting element for receiving error signals which are formed of the output signal of the integrator representing the desired value, and the actual value of the correcting element.
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Elektro-Mechanik GmbH
Haugland Scott J.
Hornsby Harvey C.
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