Machine for inflating and sealing air filled cushioning materials
View Patent ↗Machine for inflating and sealing a preconfigured cushioning material which is wound in a roll on a hollow cylindrical core and has superposed layers of plastic film sealed together to form rows of interconnected, inflatable cells, a longitudinally extending channel near one edge of the material and inlet passageways interconnecting the channel and the rows of cells. The machine includes a rotatively mounted roll support shaft, a hub mounted on the shaft for engagement with the core at the end of the roll near the channel, a circumferentially expandable roll gripper for locking engagement with the inner wall of the cylindrical core, a feed mechanism for drawing the material and feeding it along a predetermined path, an inflator for injecting air into the cells, a nip roller, a pressing mechanism for pressing the nip roller against the roll of material, and a sealing mechanism for sealing the inlet passageways to retain the air in the cells.
1. A machine for inflating and sealing a preconfigured cushioning material which is wound in a roll on a hollow cylindrical core and has superposed layers of plastic film sealed together to form rows of interconnected, inflatable cells, a longitudinally extending channel near one edge of the material and inlet passageways interconnecting the channel and the rows of cells, comprising:
a rotatively mounted roll supported shaft having a fixed end and a free end, a hub mounted on the shaft near the fixed end for engagement with the core at the end of the roll near the channel, a circumferentially expandable roll gripper at the free end of the shaft for locking engagement with the inner wall of the cylindrical core, a feed mechanism for drawing the material from the roll and feeding it along a predetermined path, an inflator having one or more outlet openings for injecting air into the cells as the material travels along the path, a nip roller, a pressing mechanism for pressing the nip roller against the roll of film material to limit the flow of air into the material on the roll and to provide rolling resistance to rotation of the roll, and a sealing mechanism for sealing the inlet passageways to retain the air in the cells.
2. The machine of claim 1 wherein the roll gripper includes a body with an axially inclined surface, a jaw in sliding engagement with the inclined surface, and a screw operable from the fixed end of the shaft for advancing the jaw along the inclined surface to drive the jaw in an outward direction toward the inner wall of the core.
3. The machine of claim 2 wherein the body of the roll gripper is affixed to the free end of the shaft, and the screw is threadedly connected to the jaw for drawing the jaw and the body together.
4. The machine of claim 1 wherein the inflator includes a hollow base and a plurality of wire-like elements extending between the base and the conically tapered tip, with the openings being formed between the wire-like elements.
5. The machine of claim 1 wherein the inflator has an elongated tubular body with a conically tapered tip being mounted at one end of the tubular body, and the outlet openings being formed as elongated slots in the side wall of the tubular body.
6. The machine of claim 5 including a knife blade mounted on the inflator for slitting the film along the channel when the cells are inflated.
7. The machine of claim 1 wherein the nip roller is mounted on a swing arm and pressed against the roll of film material by a spring.