US 3,940,043 AGranted

Adjustable-bow bar or roll axle

AssigneeMount Hope Machinery Company

InventorRobert E. Staples

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Abstract

An adjustable-bow bar or roll axle, useful for spreading slit sheets of paper and for other purposes, includes a hollow cylindrical shell. Two tension bolts extend along axes parallel to the centerline of the shell, and interconnect the ends of the bar or axle. One of the bolts lies in a plane of desired curvature of the bar and applies a bending moment to curve the bar in this plane; this bolt may be located inside or outside the shell, depending on the required bending moment. The second bolt may be inside the shell; its angular position is adjustable with respect to that of the first. This bolt is set in the plane of a resultant force applied to the bar by the tension in the sheet, and applies a bending moment to offset this force and prevent curvature of the bar in this plane. A third bolt may be located in a vertical plane to apply a bending moment to prevent curvature of the bar by its weight; or the second bolt may serve this purpose also.

Claims13

Dependent claims

An adjustable-bow device having an arcuate outer surface portion adapted for wrapping by an indefinite length of sheet material wrapped partially thereabout, said device comprising a hollow cylindrical shell having a major longitudinal axis, and means for supporting said shell with a predetermined angular orientation;

first means for applying adjustable longitudinal stress to said shell along a first axis parallel to and spaced apart from said major axis, said first stress-applying means being constructed and arranged to bow said shell parallel to a first plane defined by said first axis and said major axis;
said shell being subject to a resultant force applied to said shell and lying in a second plane defined by said major axis and a second axis parallel to and spaced apart from said major axis, said resultant force tending to induce undesired curvature in said shell parallel to said second plane;
and second means constructed and arranged for applying adjustable longitudinal stress to said shell in said second plane and in opposition to said resultant force to remove said undesired curvature from said shell.

Dependencies are inferred from the claim text.