Metal deforming – By deflecting successively-presented portions of work during... – By use of deflected arranged to provide longitudinally...
Patent
1975-07-07
1977-01-11
Mehr, Milton S.
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflected arranged to provide longitudinally...
271 63, 271183, B21D 100
Patent
active
040020479
ABSTRACT:
A sheet material decurling apparatus for use with a machine having a sheet conveyor comprises a trough member which includes two elongate, sheet supporting members, each having an arcuate upper surface with a radius greater than 250t, where t is the thickness of the sheet material. An elongate fillet, curved in the direction opposite to and joining the sheet supporting member surfaces, has a radius less than 15t. Further, the angle formed between the planes tangent to the sheet supporting member surfaces at the lines of transition therefrom into the fillet is in the range of 60.degree. to 120.degree.. A series of vacuum conduits are disposed in the trough member adjacent the bottom of the fillet and have a total cross-sectional area of approximately 0.07 inches square per linear foot of trough member. A vacuum pump is connected to the vacuum conduits to effect air flow downwardly through the trough member. The conveyor draws the sheet material across the trough member with the curl directed downwardly so that air flow caused by the vacuum pump can pull the sheet material down onto the sheet supporting member surfaces and into the fillet surface to impart a bend, opposite to that of the curl, to the sheet.
The trough member geometry causes effective sheet decurling without imparting additional curl to the sheet. The vacuum conduit sizing reduces the capacity of the vacuum pump needed for effective decurling while allowing operation on sheets having widths less than the decurler capacity without covering the exposed conduits.
REFERENCES:
patent: 2323768 (1943-07-01), Hanna
patent: 3076492 (1963-02-01), Monks
patent: 3559438 (1971-02-01), Rouyer et al.
Gasparrini Charles Robert
MacPhee John M.
Baldwin-Gegenheimer Corporation
Mehr Milton S.
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