A method for decelerating a sheet of material traveling along a travel path at a first speed, the method comprising: delivering the sheet of material past a cam nip, the cam nip being rotatable on a first axis substantially perpendicular to the travel path; driving rotation of the cam nip in response to a sensing means tracking the sheets of material traveling along the travel path towards a stacking hopper; characterized in that the steps of driving rotation of the cam nip include: (a) initially positioning a lobe end of the cam nip in a ready position away from the travel path such that the sheet of material can pass substantially unimpeded past the cam nip; (b) in response to the sensing means sensing the sheet of material traveling along the travel path, initiating rotation of a lobe end of the cam nip toward the travel path from the ready position to a nip position such that when the lobe end is near the travel path in the nip position, the trailing edge of the sheet of material or a part of the sheet of material as close to its trailing edge as possible is nipped by the cam nip and captured between the tip of the lobe end and a decelerator and held in the nip position long enough for the sheet of material to be decelerated from the first speed to a second speed with the cam nip urging the sheet of material into frictional contact with the decelerator that is positioned below the level of a conveyer that defines the travel path before the sheet of material is nipped by the cam nip such that the projected sheet drops as it is engaged by the cam nip thereby minimizing interference from the leading edge of a following sheet of material; and (c) continuing rotation of the cam nip from the nip position to the ready position with the lobe end of cam nip away from the travel path after the projected sheet of material has decelerated to the second speed so as to allow the leading edge of a subsequent sheet of material to be delivered past the cam nip without interference from the lobe end of the cam nip. delivering the sheet of material past a cam nip, the cam nip being rotatable on a first axis substantially perpendicular to the travel path; driving rotation of the cam nip in response to a sensing means tracking the sheets of material traveling along the travel path towards a stacking hopper; characterized in that the steps of driving rotation of the cam nip include: (a) initially positioning a lobe end of the cam nip in a ready position away from the travel path such that the sheet of material can pass substantially unimpeded past the cam nip; (b) in response to the sensing means sensing the sheet of material traveling along the travel path, initiating rotation of a lobe end of the cam nip toward the travel path from the ready position to a nip position such that when the lobe end is near the travel path in the nip position, the trailing edge of the sheet of material or a part of the sheet of material as close to its trailing edge as possible is nipped by the cam nip and captured between the tip of the lobe end and a decelerator and held in the nip position long enough for the sheet of material to be decelerated from the first speed to a second speed with the cam nip urging the sheet of material into frictional contact with the decelerator that is positioned below the level of a conveyer that defines the travel path before the sheet of material is nipped by the cam nip such that the projected sheet drops as it is engaged by the cam nip thereby minimizing interference from the leading edge of a following sheet of material; and (c) continuing rotation of the cam nip from the nip position to the ready position with the lobe end of cam nip away from the travel path after the projected sheet of material has decelerated to the second speed so as to allow the leading edge of a subsequent sheet of material to be delivered past the cam nip without interference from the lobe end of the cam nip. (a) initially positioning a lobe end of the cam nip in a ready position away from the travel path such that the sheet of material can pass substantially unimpeded past the cam nip; (b) in response to the sensing means sensing the sheet of material traveling along the travel path, initiating rotation of a lobe end of the cam nip toward the travel path from the ready position to a nip position such that when the lobe end is near the travel path in the nip position, the trailing edge of the sheet of material or a part of the sheet of material as close to its trailing edge as possible is nipped by the cam nip and captured between the tip of the lobe end and a decelerator and held in the nip position long enough for the sheet of material to be decelerated from the first speed to a second speed with the cam nip urging the sheet of material into frictional contact with the decelerator that is positioned below the level of a conveyer that defines the travel path before the sheet of material is nipped by the cam nip such that the projected sheet drops as it is engaged by the cam nip thereby minimizing interference from the leading edge of a following sheet of material; and (c) continuing rotation of the cam nip from the nip position to the ready position with the lobe end of cam nip away from the travel path after the projected sheet of material has decelerated to the second speed so as to allow the leading edge of a subsequent sheet of material to be delivered past the cam nip without interference from the lobe end of the cam nip.