Sheet feeding or delivering – Delivering – By pneumatic conveyor
Patent
1998-03-31
2000-07-11
Ellis, Christopher P.
Sheet feeding or delivering
Delivering
By pneumatic conveyor
271197, 271188, 414793, 4147931, B65H 2932
Patent
active
060860634
ABSTRACT:
A sheet stacking apparatus includes laterally spaced, longitudinally arranged conveyors for supporting edge regions of a sheet, the conveyors driven to deliver the sheet horizontally to a stacking area. At the stacking area the conveyors are separated to drop the sheet onto a stack of sheets. During the delivery of the sheet to the stack, the mid-span of the sheet is supported from above to prevent sagging of the sheet. The mid-span is supported by at least one low pressure chamber which extends along the delivery path of the sheet. The low pressure chamber includes a plurality of suction compartments arranged in sequence, each suction compartment including a horizontally disposed air nozzle and an air outlet to create a horizontal "Fanno effect" air stream adjacent a top surface of the sheet to create suction within the low pressure chamber which holds the sheet in sliding contact against a bottom surface of the low pressure chamber. The bottom surface preferably includes a plurality of rollers to allow a reduced friction sliding/rolling of the sheet along the low pressure chamber.
REFERENCES:
patent: 3373922 (1968-03-01), Snellman et al.
patent: 3622150 (1971-11-01), Hayes
patent: 4396332 (1983-08-01), Schmidt et al.
patent: 4938657 (1990-07-01), Benson et al.
patent: 5051145 (1991-09-01), Lenhardt
patent: 5265867 (1993-11-01), Magee
patent: 5566933 (1996-10-01), Salancy
Ellis Christopher P.
Mackey Patrick
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