Filament winding device and filament winding method

1 . A filament winding device configured to supply a band-shaped bundle, which is a bundle of a plurality of fibers, to a workpiece, and wind the band-shaped bundle around the workpiece, the workpiece including a cylinder portion having a round tubular shape and dome portions provided at both ends of the cylinder portion, the filament winding device comprising:

a plurality of rollers configured to rotate while being in contact with the band-shaped bundle to thereby feed the band-shaped bundle toward the workpiece; and

a roller changer configured to select one of the plurality of rollers and bring a selected roller into contact with the band-shaped bundle,

wherein the plurality of rollers include a straight roller and at least one crown roller, and

the roller changer is configured to:

when the band-shaped bundle is wound around the workpiece by way of hoop winding, select the straight roller and bring the selected straight roller into contact with the band-shaped bundle; and

when the band-shaped bundle is wound around the workpiece by way of helical winding, select the crown roller and bring the selected crown roller into contact with the band-shaped bundle.

2 . The filament winding device according to claim 1 , wherein a curvature of a surface of each of the two dome portions changes along a radial direction of the dome portions orthogonal to the central axis,

the plurality of rollers include the straight roller and a plurality of crown rollers having different curvatures from each other, and

the roller changer selects one of the plurality of crown rollers depending on a winding angle of the band-shaped bundle on the workpiece with respect to a central axis of the workpiece, and brings the selected crown roller into contact with the band-shaped bundle.

3 . The filament winding device according to claim 2 , wherein the plurality of crown rollers are a first crown roller and a second crown roller having a curvature larger than that of the first crown roller,

the curvature of the surface of each of the two dome portions increases as a distance from the central axis in the radial direction increases, and

the roller changer is configured to:

when the helical winding is performed on a part of each of the two dome portions close to the central axis having a relatively small curvature of the surface, select the first crown roller and bring the selected first crown roller into contact with the band-shaped bundle; and

when the helical winding is performed on a part of each of the two dome portions close to the cylinder portion having a relatively large curvature of the surface, select the second crown roller and bring the selected second crown roller into contact with the band-shaped bundle.

4 . The filament winding device according to claim 2 , wherein the plurality of crown rollers are a first crown roller and a second crown roller having a curvature larger than that of the first crown roller,

the curvature of the surface of each of the two dome portions decreases as a distance from the central axis in the radial direction increases, and

the roller changer is configured to:

when the helical winding is performed on a part of each of the two dome portions close to the central axis having a relatively large curvature of the surface, select the second crown roller and bring the selected second crown roller into contact with the band-shaped bundle; and

when the helical winding is performed on a part of each of the two dome portions close to the cylinder portion having a relatively small curvature of the surface, select the first crown roller and bring the selected first crown roller into contact with the band-shaped bundle.

5 . The filament winding device according to claim 2 , wherein the curvature of the surface of each of the two dome portions increases or decreases as a distance from a radial intermediate position on the surface toward the central axis or the cylinder portion decreases, and

the roller changer selects one of the plurality of crown rollers depending on the winding angle of the band-shaped bundle on the workpiece.