Abstract: An apparatus and method for reducing synchronous speed variations in an electric motor having a rotating shaft, comprises a speed transducer for generating a continuous analog speed signal corresponding to the speed of the motor shaft including its synchronous and asynchronous speed variations. A trigger signal is generated each time the shaft rotates through a reference position and is used in conjunction with the speed signal in a fast Fourier transform analyzer to resolve the analog signal into a synchronous time averaged signal which varies with the synchronous speed variations but which eliminates the asynchronous speed variations. An arbitrary function generator is connected to the analyzer for generating an antiwave pattern having a frequency phase and amplitude relative to the waveform from the analyzer. The function generator is connected to a motor controller and superimposes the antiwave pattern onto a control signal internal to the controller which is thereafter applied to the motor.

Abstract: A method and apparatus are provided for metering of coating on a moving web of material, such as linerboard, paperboard, paper, film, foil or the like, in which the web is fed between a support and a skirt of flexible plastic sheet material extending across the full width of the web and having a free end portion extending contiguous and parallel to and in the direction of movement of the web, and a pressurized tube in contact with the free end portion of the skirt cooperates with the skirt and the web to create a constant pressure web coating region between the web and the free end portion of the skirt within which the coating thickness is skimmed down to provide a layer of coating on the web of substantially uniform thickness.

Abstract: A method and apparatus are provided for metering and smoothing coating on a moving web of material, such as linerboard, paperboard, paper, film, foil or the like, in which the web is fed between a skimming rod below the coated side of the web and a skirt of flexible plastic sheet material extending across the full width of the upper or uncoated side of the web and having a free end portion extending in contact with and in the direction of movement of the web. A pressurized tube in contact with the free end portion of the skirt, causes the skirt to bear directly on the upper surface of the web and downwardly on the rod to create a constant pressure web coating region between the web and the rod within which the coating thickness is skimmed down by the rod to provide a layer of coating on the web of substantially uniform thickness.