US 6,082,081 A · Powered prestretched film delivery apparatus

Abstract

A prestretch roller assembly for a film delivery system includes upstream and downstream prestretch drive rollers for engaging and stretching a stretch film web. The web extends around an upper portion of the upstream drive roller and thence directly to a lower portion of the downstream drive roller, to form a generally S-shaped path. The downstream drive roller is rotatably mounted on a stationary frame, and the upstream drive roller has one end rotatably connected to the stationary frame and a second end rotatably connected to a swing frame. An upstream idler roller is rotatably mounted on the stationary frame upstream of the upstream drive roller, and a downstream idler roller is rotatably mounted from the swing frame downstream of the downstream drive roller. The axes of all four rollers are coplanar when the swing frame is moved to a closed position.

Claims11

Dependent claims

A prestretch roller assembly for a film delivery system, comprising:

upstream and downstream prestretch drive rollers, each rotatable about an axis, for engaging and stretching stretch film material;
a web of stretch film extending around an upper portion of the upstream drive roller and thence directly to a lower portion of the downstream drive roller to form a generally S-shaped path;
two idler rollers, one of said two idler rollers being positioned downstream of said downstream drive roller and rotatable about an axis for engaging the stretch film material, the other of said two idler rollers being positioned upstream of said upstream drive roller and rotatable about an axis for engaging the stretch film material, the axes of the drive rollers and the idler rollers being coplanar;
and
drive means connected to the drive rollers for driving the rollers in opposite directions.

2 more elements

A prestretch roller assembly for a film delivery system, comprising:

upstream and downstream prestretch drive rollers for engaging and stretching stretch film material:
a web of stretch film extending around an upper portion of the upstream drive roller and thence directly to a lower portion of the downstream drive roller to form a generally S-shaped path;
and
drive means connected to the drive rollers for driving the rollers in opposite directions;
the downstream drive roller being rotatably mounted on a stationary frame and the upstream drive roller having first and second ends, said first end connected to the stationary frame, and said second end mounted on a swing frame pivotable about an axis orthogonal to the axes of the drive rollers and intersecting both drive roller axes.

2 more elements

A prestretch roller assembly for a film delivery system, comprising:

upstream and downstream prestretch drive rollers for engaging and stretching stretch film material, the upstream drive roller having a smaller diameter than the downstream drive roller;
a web of stretch film extending around an upper portion of the upstream drive roller and thence directly to a lower portion of the downstream drive roller to form a generally S-shaped path;
drive means connected to the drive rollers for driving the rollers in opposite directions;
and
the downstream drive roller being rotatably mounted on a stationary frame and the upstream drive roller having first and second ends, said first end connected to the stationary frame, and said second end mounted on a swing frame pivotable about an axis orthogonal to the axes of the drive rollers and intersecting both drive roller axes.

2 more elements

Dependencies are inferred from the claim text.

Powered prestretched film delivery apparatus

Life of this patent

Powered prestretched film delivery apparatus

Life of this patent

Abstract

Claims11