Cutting mechanism for rotary knife cutting machines

Claim 2

A cutting mechanism for cutting a roll of material into plural tapes comprising a support, a rotary sawing blade having a sawing edge, a rotary trimming blade having a trimming edge, said blades being disposed substantially in a common plane at right angles to the longitudinal axis of said roll and substantially in opposed relation to each other, carrier means mounting said blades on said support for movement through a cutting stroke in said common plane from a retracted position spaced from said longitudinal axis to an advanced position contiguous thereto, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment such that said roll of material is first cut by said sawing blade and then trimmed by said trimming blade during said cutting stroke, and means operatively connected to said sawing blade and to said trimming blade for rotating said blades.

Claim 3

A cutting mechanism according to claim 1 wherein said trimming blade is of a greater width than said sawing blade.

Claim 4

A cutting mechanism for a cutting machine including a support, a shaft on said support adapted to receive a roll of material and a chuck for rotating said roll of material comprising a rotary sawing blade having a sawing edge, a rotary trimming blade having a trimming edge, said blades being disposed substantially in a common cutting plane at right angles to the longitudinal axis of said stationary shaft and substantially in opposed relation to each other, carrier means mounting said blades on said support for movement through a cutting stroke in said common cutting plane from a retracted position spaced from said stationary shaft to an advanced position contiguous to said shaft, said sawing edge being disposed radially inwardly of said trimming edge such that said roll of material is first cut by said sawing blade and then trimmed by said trimming blade during said cutting stroke, saw-rotating means operatively connected to said sawing blade, and trim-rotating means operatively connected to said trimming blade.

Claim 5

A cutting mechanism for a cutting machine including a support, a shaft on said support adapted to receive a roll of material and a chuck for rotating said roll of material comprising a rotary sawing blade having a sawing edge, a rotary trimming blade having a trimming edge, said blades being disposed substantially in a common cutting plane at right angles to the longitudinal axis of said stationary shaft and substantially in opposed relation to each other, carrier means mounting said blades on said support for movement through a cutting stroke in said common cutting plane from a retracted position spaced from said stationary shaft to an advanced position contiguous to said shaft, said sawing edge being disposed radially inwardly of said trimming edge such that said roll of material is first cut by said sawing blade and then trimmed by said trimming blade during said cutting stroke, saw-rotating means operatively connected to said sawing blade, and trim-rotating means operatively connected to said trimming blade.

Claim 6

In a cutting machine, a support, a stationary shaft on said support adapted to receive a roll of material, a chuck for rotating said roll of material, and cutting mechanisms for cutting said roll of material into plural tapes, the improvement comprising said cutting mechanisms including a rotary sawing blade having a sawing edge, a rotary trimming blade having a trimming edge, said blades being disposed substantially in a common cutting plane at right angles to the axis of said stationary shaft and substantialLy in opposed relation to each other, carrier means mounting said blades on said support for movement through a cutting stroke in said common cutting plane from a retracted position spaced from said stationary shaft to an advanced position contiguous to said shaft, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment such that said roll of material is first cut by said sawing blade and then trimmed by said trimming blade during said cutting stroke, and means operatively connected to said sawing blade and to said trimming blade for rotating said blades.

Claim 7

In a cutting machine, a support, a stationary shaft on said support adapted to receive a roll of material, a chuck for rotating said roll of material, and cutting mechanisms for cutting said roll of material into plural tapes, the improvement comprising said cutting mechanisms including a rotary sawing blade having a sawing edge, a rotary trimming blade having a trimming edge, said blades being disposed substantially in a common cutting plane at right angles to the axis of said stationary shaft and substantialLy in opposed relation to each other, carrier means mounting said blades on said support for movement through a cutting stroke in said common cutting plane from a retracted position spaced from said stationary shaft to an advanced position contiguous to said shaft, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment such that said roll of material is first cut by said sawing blade and then trimmed by said trimming blade during said cutting stroke, and means operatively connected to said sawing blade and to said trimming blade for rotating said blades.

Claim 8

In a rotary knife cutting machine, a frame including a knife mount, roll-supporting and turning means on said frame including a shaft adapted to receive and support a roll of material which is to be cut into a plurality of tapes while turning about the shaft axis, a sawing knife carrier mounted on said knife mount for movement toward and away from said shaft, a rotary sawing knife having a sawing edge mounted on said sawing knife carrier for rotation about a sawing axis parallel to said shaft axis, a trimming knife carrier mounted on said knife mount for movement toward and away from said shaft, a rotary trimming knife having a trimming edge mounted on said trimming knife carrier for rotation about a trimming axis parallel to said shaft axis, said sawing and trimming knives being disposed in opposed relation to each other and in a common cutting plane extending at right angles to said shaft axis, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment such that said roll of material is first cut by said sawing knife and then trimmed by said trimming knife during movement of said knives toward said shaft, means operatively connected to said sawing and trimming knife carriers for moving said sawing and trimming knives toward said shaft during a cutting stroke while maintaining said fixed increment between said sawing and trimming edges, and means operatively connected to said knives for rotating said knives.

Claim 9

In a rotary knife cutting machine, a frame including a knife mount, roll-supporting and turning means on said frame including a shaft adapted to receive and support a roll of material which is to be cut into a plurality of tapes while turning about the shaft axis, a sawing knife carrier mounted on said knife mount for movement toward and away from said shaft, a rotary sawing knife having a sawing edge mounted on said sawing knife carrier for rotation about a sawing axis parallel to said shaft axis, a trimming knife carrier mounted on said knife mount for movement toward and away from said shaft, a rotary trimming knife having a trimming edge mounted on said trimming knife carrier for rotation about a trimming axis parallel to said shaft axis, said sawing and trimming knives being disposed in opposed relation to each other and in a common cutting plane extending at right angles to said shaft axis, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment such that said roll of material is first cut by said sawing knife and then trimmed by said trimming knife during movement of said knives toward said shaft, means operatively connected to said sawing and trimming knife carriers for moving said sawing and trimming knives toward said shaft during a cutting stroke while maintaining said fixed increment between said sawing and trimming edges, and means operatively connected to said knives for rotating said knives.

Claim 10

In a rotary knife cutting machine according to claim 5, said trimming knife being of a greater width than said sawing knife such as to trim adjacent faces of said roll of material after cutting said said sawing knife.

Claim 11

In a rotary knife cutting machine, a frame, roll-supporting and turning means on said frame including a stationary shaft adapted to receive and support a roll of material which is to be cut into a plurality of tapes while turning about the shaft axis, a knife carriage, means mounting said knife carriage on said frame for longitudinal traverse along a path parallel to said shaft axis, a sawing knife carrier mounted on said knife carriage for movement toward and away from said stationary shaft, a rotary sawing knife having a sawing edge mounted on said sawing knife carrier for rotation about a sawing axis parallel to said shaft axis, a trimming knife carrier mounted on said knife carriage for movement toward and away from said stationary shaft, a rotary trimming knife having a trimming edge mounted on said trimming knife carrier for rotation about a trimming axis parallel to said shaft axis, said sawing and trimming knives being disposed in a common cutting plane extending at right angles to said shaft axis, said sawing edge being disposed radially inwardly of said trimming edge such that said roll of material is first cut by said sawing knife and then trimmed by said trimming knife during movement of said knives toward said stationary shaft, means operatively connected to said sawing and trimming knife carrier for moving said sawing and trimming knives toward and away from said stationary shaft during a cutting cycle while maintaining the radial relationship between said sawing and trimming edges, means operatively connected to said sawing knife for rotating said knife at a sawing speed, and separate means operatively connected to said trimming knife for rotating said trimming knife at a trimming speed.

Claim 12

In a rotary knife cutting machine, a frame, roll-supporting and turning means on said frame including a stationary shaft adapted to receive and support a roll of material which is to be cut into a plurality of tapes while turning about the shaft axis, a knife carriage, means mounting said knife carriage on said frame for longitudinal traverse along a path parallel to said shaft axis, a sawing knife carrier mounted on said knife carriage for movement toward and away from said stationary shaft, a rotary sawing knife having a sawing edge mounted on said sawing knife carrier for rotation about a sawing axis parallel to said shaft axis, a trimming knife carrier mounted on said knife carriage for movement toward and away from said stationary shaft, a rotary trimming knife having a trimming edge mounted on said trimming knife carrier for rotation about a trimming axis parallel to said shaft axis, said sawing and trimming knives being disposed in a common cutting plane extending at right angles to said shaft axis, said sawing edge being disposed radially inwardly of said trimming edge such that said roll of material is first cut by said sawing knife and then trimmed by said trimming knife during movement of said knives toward said stationary shaft, means operatively connected to said sawing and trimming knife carrier for moving said sawing and trimming knives toward and away from said stationary shaft during a cutting cycle while maintaining the radial relationship between said sawing and trimming edges, means operatively connected to said sawing knife for rotating said knife at a sawing speed, and separate means operatively connected to said trimming knife for rotating said trimming knife at a trimming speed.

Claim 13

A cutting mechanism for use in a rotary knife cutting machine including a frame, roll-supporting and turning means on said frame including a stationary shaft adapted to receive and support a roll of material which is to be cut into a plurality of tapes while turning about the shaft axis, a knife carriage and means mounting said knife carriage on said frame for longitudinal traverse along a path parallel to said shaft axis, said cutting mechanism including a sawing knife carrier adapted to be pivotally mounted on said knife carriage for movement toward and away from said stationary shaft, a rotary sawing knife having a sawing edge rotatably mounted on said sawing knife carrier for rotation about a sawing axis parallel to said shaft axis, a trimming knife carrier adapted to be pivotally mounted on said knife carriage for movement toward and away from said stationary shaft, a rotary trimming knife having a trimming edge rotatably mounted on said trimming knife carrier for rotation about a trimming axis parallel to said shaft axis, said sawing and trimming knives being disposed in opposed relation to each other in a substantially common plane extending at right angles to said shaft axis, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment and being of a lesser width then said trimming edge such that said roll of material is first cut by said sawing knife and then trimmed by said trimming knife during movement of said knives toward said stationary shaft, and means for rotating said knives.

Claim 14

A cutting mechanism for use in a rotary knife cutting machine including a frame, roll-supporting and turning means on said frame including a stationary shaft adapted to receive and support a roll of material which is to be cut into a plurality of tapes while turning about the shaft axis, a knife carriage and means mounting said knife carriage on said frame for longitudinal traverse along a path parallel to said shaft axis, said cutting mechanism including a sawing knife carrier adapted to be pivotally mounted on said knife carriage for movement toward and away from said stationary shaft, a rotary sawing knife having a sawing edge rotatably mounted on said sawing knife carrier for rotation about a sawing axis parallel to said shaft axis, a trimming knife carrier adapted to be pivotally mounted on said knife carriage for movement toward and away from said stationary shaft, a rotary trimming knife having a trimming edge rotatably mounted on said trimming knife carrier for rotation about a trimming axis parallel to said shaft axis, said sawing and trimming knives being disposed in opposed relation to each other in a substantially common plane extending at right angles to said shaft axis, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment and being of a lesser width then said trimming edge such that said roll of material is first cut by said sawing knife and then trimmed by said trimming knife during movement of said knives toward said stationary shaft, and means for rotating said knives.

Claim 15

A cutting mechanism for cutting a roll of material into plural tapes comprising; a support, a rotary sawing blade having a sawing edge, a rotary trimming blade having a trimming edge, said blades being disposed substantially in a common plane at right angles to the longitudinal axis of said roll and substantially in opposed relation to each other, carrier means mounting said blades on said support for movement through a cutting stroke in said common plane from a retracted position spaced from said longitudinal axis to an advanced position contiguous thereto, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment such that said roll of material is first cut by said sawing blade and then trimmed by said trimming blade during said cutting stroke, and power means for driving one of said blades.

Claim 16

A cutting mechanism for cutting a roll of material into plural tapes comprising; a support, a rotary sawing blade having a sawing edge, a rotary trimming blade having a trimming edge, said blades being disposed substantially in a common plane at right angles to the longitudinal axis of said roll and substantially in opposed relation to each other, carrier means mounting said blades on said support for movement through a cutting stroke in said common plane from a retracted position spaced from said longitudinal axis to an advanced position contiguous thereto, said sawing edge being disposed radially inwardly of said trimming edge by a fixed increment such that said roll of material is first cut by said sawing blade and then trimmed by said trimming blade during said cutting stroke, and power means for driving one of said blades.