An apparatus for singling sheet goods which comprises a suction device with a stator and a rotor movable relative to the stator. The stator has at least one first opening and the rotor at least one second opening which overlap upon a rotation of the rotor and thereby define an opening area with a first end and a second end. The opening area extends starting from the first end up to the second end, wherein a section of the opening area between the first end and the second end forms a suction area in which sheet goods to be singled can be sucked by the suction device. The first end of the opening area is arranged spaced from the suction area so that arising noise can be dampened.

A sheet handling apparatus for a printing system includes a rotary drum having an inner chamber circumferentially surrounded by an outer peripheral wall with perforations formed therein. By means of sucking an air flow through the perforations of the drum to a suction system, sheets are attracted to the peripheral wall of the drum. A stationary shutter member is positioned inside the inner chamber for blocking the flow of air through the perforations when they pass, with the rotation of the drum, through a first predetermined angular range. The shutter member includes protrusions while the rotary drum includes recesses for receiving the protrusions, such that a meandering air flow passage is formed between the shutter member and the rotary drum. As such, friction between the rotary drum and the stationary shutter member is reduced, thereby reducing the power consumption of the suction system.

An apparatus for singling sheet goods which comprises a suction device with a stator and a rotor movable relative to the stator. The stator has at least one first opening and the rotor at least one second opening which overlap upon a rotation of the rotor and thereby define an opening area with a first end and a second end. The opening area extends starting from the first end up to the second end, wherein a section of the opening area between the first end and the second end forms a suction area in which sheet goods to be singled can be sucked by the suction device. The first end of the opening area is arranged spaced from the suction area so that arising noise can be dampened.

A sheet handling apparatus for a printing system includes a rotary drum having an inner chamber circumferentially surrounded by an outer peripheral wall with perforations formed therein. By means of sucking an air flow through the perforations of the drum to a suction system, sheets are attracted to the peripheral wall of the drum. A stationary shutter member is positioned inside the inner chamber for blocking the flow of air through the perforations when they pass, with the rotation of the drum, through a first predetermined angular range. The shutter member includes protrusions while the rotary drum includes recesses for receiving the protrusions, such that a meandering air flow passage is formed between the shutter member and the rotary drum. As such, friction between the rotary drum and the stationary shutter member is reduced, thereby reducing the power consumption of the suction system.

An absorption apparatus 1 that is an example of a loop amount absorption apparatus of a slitter line to which the present invention is applied is disposed in a region of a loop pit 3 provided in the slitter line 2. The absorption apparatus 1 includes a negative pressure roll 9 that grips and conveys strips and an up-down moving device 10 that enables the negative pressure roll 9 to move up and down. By gripping and conveying the strips 14 by the negative pressure roll 9, two loops 15 of the strips are formed. The negative pressure roll 9 includes a rotating shaft 16, an inner cylinder 17, an intermediate cylinder 18, and a non-woven fabric laminated outer layer 19.

A sheet handling apparatus comprising a rotary drum having an outer peripheral wall with perforations, and a number of separate chambers, a suction system for controlling a flow of air through the perforations, thereby to attract sheets to the peripheral wall of the drum, and a stationary shutter member for blocking the flow of air through the perforations when they pass through a predetermined angular range. The number of separate chambers extend in axial direction and are distributed over the periphery of the drum. A disk-shaped manifold at the first axial end of the drum is co-rotatably with the drum. The manifold forms a number of radial channels each connected to one of said chambers and having an opening at a radially inward end of each channel. The stationary shutter member is arranged for blocking an opening of a channel to block air flow from a radially inward end of a channel.