Abstract: An apparatus for controlling the speed of a rotary cutter driven by an electric motor for cutting to length a sheet material continuously supplied to the rotary cutter. Means are provided for applying to the electric motor a dc voltage whose amplitude is proportional to the rate of the number of pulses of a pulse train said pulse train being synchronous with the feed rate of the sheet material when the blades of the rotary cutter pass the cutting position, means for progressively decreasing the number of pulses of the pulse train, the decrease in the number of pulses beginning at a predetermined position beyond the cutting position and being effected at a rate following a first pattern, means for progressively lowering the rate of the decrease in accordance with a second pattern when the number by which the pulses are decreased reaches a first predetermined value, and means for suspending the decrease when the number by which the pulses are decreased reaches a second predetermined value.

Abstract: A method and apparatus for cutting a continuously moving sheet material in which a nozzle for directing a jet stream of fluid under high pressure is driven in predetermined directions along a closed track consisting of a pair of straight paths intersecting each other symmetrically at a predetermined angle relative to the cutting direction of the sheet material and a pair of curved paths connecting the associated ends of the straight paths. In the method and apparatus, the moving velocity of the jet nozzle is controlled as a function of the feeding velocity of the sheet material and the desired length of sheets cut from the sheet material, and the energy of the fluid under high pressure directed from the moving jet nozzle toward the sheet material is utilized to cut the sheet material into the sheets of desired length.

Abstract: An apparatus for controlling the speed of a rotary cutter driven by an electro-hydraulic pulse motor for cutting to length a sheet material continuously supplied to the rotary cutter. Means are provided for applying to the electro-hydraulic pulse motor a pulse train synchronous with the feed rate of the sheet material when the blades of the rotary cutter pass the cutting position, means for progressively decreasing the number of pulses applied to the electro-hydraulic pulse motor, the decrease in the number of pulses beginning at a predetermined position beyond the cutting position and being effected at a rate following a first pattern, means for progressively lowering the rate of the decrease in accordance with a second pattern when the number by which the pulses are decreased reaches a first predetermined value, and means for suspending the decrease when the number by which the pulses are decreased reaches a second predetermined value.