Dunnage conversion machine, method and dunnage product
A dunnage conversion machine is characterized by a forming assembly which causes lateral edge portions of a substantially continuous sheet stock material to crumple and to fold upon themselves, leaving an unfolded central portion between the laterally spaced apart folded portions. The layers of sheet stock material in the folded portions are fixed by a feeding/fixing assembly having two pairs of laterally spaced feed assemblies to form a dunnage product which does not come apart as it is manipulated. A severing assembly severs discrete dunnage products from the continuous strip of dunnage.
1. A dunnage conversion machine for converting sheet stock material into a dunnage product, comprising a forming assembly and a feeding/fixing assembly downstream of the forming assembly, the feeding/fixing assembly advancing the sheet stock material from a supply thereof along the forming assembly, whereby the feeding/fixing assembly cooperates with the forming assembly to cause inward folding and crumpling of lateral edge portions of the sheet stock material to form a strip of dunnage having laterally spaced apart folded edge portions, wherein the feeding/fixing assembly includes laterally spaced-apart feeding/fixing members that engage respective laterally spaced apart folded edge portions to feed the sheet stock material through the machine and to fix the folded edge portions in a folded state.
2. A dunnage conversion machine as set forth in claim 1 , wherein said feeding/fixing members include at least two laterally spaced-apart rotating members and at least one opposing rotating member between which the respective folded crumpled edge portions pass.
3. A dunnage conversion machine as set forth in claim 2 , wherein the at least one opposing rotating member is laterally continuous.
4. A dunnage conversion machine as set forth in claim 2 , wherein said rotating members and said opposing rotating member include at least two pairs of gear members having intermeshed teeth for mechanically deforming the respective folded crumpled edge portion to impart permanent deformation therein.
5. A dunnage conversion machine as set forth in claim 2 , wherein at least one of the rotating members has on the outer diameter thereof projections and recesses for enhancing engagement with one of the folded edge portions.
6. A dunnage conversion machine as set forth in claim 2 , wherein the rotating members rotate about axes which are parallel to a width dimension of the sheet stock material.
7. A dunnage conversion machine as set forth in claim 1 , wherein the feeding/fixing assembly includes a biased pressure shoe which minimizes lateral folding of a central portion of the sheet stock material downstream of the forming assembly.
8. A dunnage conversion machine as set forth in claim 7 , wherein the pressure shoe is positioned between the laterally spaced-apart feeding/fixing members.
9. A dunnage conversion machine as set forth in claim 1 , wherein the forming assembly includes a chute and a former which define a path therebetween for the passage of the sheet stock material, with the former extending into the chute such that the stock material passes between the former and the chute.
10. A dunnage conversion machine as set forth in claim 9 , wherein the former has the shape of a generally flat plate.
11. A dunnage conversion machine as set forth in claim 10 , wherein the former has a generally triangular shape.
12. A dunnage conversion machine as set forth in claim 9 , wherein the former is angularly adjustable relative to the chute.
13. A dunnage conversion machine as set forth in claim 9 , wherein the former is longitudinally adjustable relative to the chute.
14. A dunnage conversion machine as set forth in claim 9 , wherein the former is mounted to the chute.
15. A dunnage conversion machine as set forth in claim 9 , wherein the chute is a converging chute.
16. A dunnage conversion machine for converting sheet stock material into a dunnage product, comprising a conversion assembly for withdrawing the sheet stock material from a supply thereof and inwardly folding and crumpling lateral edge portions of the stock material to form a strip of dunnage having laterally spaced apart folded crumpled edge portions wherein the conversion assembly includes a feeding assembly that draws the sheet stock material into the conversion assembly, the feeding assembly including at least two laterally spaced rotating members and at least one opposing rotating member that engage the folded edge portion of the stock material that pass therebetween.
17. A dunnage conversion machine as set forth in claim 16 , wherein the laterally spaced rotating members include two pairs of laterally spaced gears.
18. A dunnage conversion machine as set forth in claim 16 , wherein the conversion assembly includes a forming assembly that inwardly the lateral edge portions of the stock material, the forming assembly including a former with the shape of a generally flat plate that engages a central portion of the sheet stock material.
19. A dunnage conversion machine as set forth in claim 18 , wherein the conversion assembly further includes a member that restricts the width of the path of the sheet stock material, thereby facilitating the inward turning of the lateral edge portions around the former.
20. A dunnage conversion machine as set forth in claim 18 , further comprising at least one roller with rounded ends over which the stock material is drawn upstream of the forming assembly, the rounded ends facilitating the inward turning of the sheet stock material.