Flexible vacuum conveyance/manifold system
View Patent ↗A vacuum conveyance/manifold system is provided for processing mailpieces. The vacuum conveyance/manifold system includes at least one conveyor belt and a compliant deck disposed beneath and supporting an underside surface of the conveyor belt. The conveyor belt has rows of aligned apertures disposed therein and a drive surface for engaging a face surface of each of the mailpieces. The compliant deck defines a neutral axis in bending and has a high elongation, low modulus material in a portion of the deck which is distal from the bending neutral axis, and a high yield strength, high modulus material in a portion of the deck which lies coincident with the bending neutral axis. Furthermore, the compliant deck has a plurality of elongate slots formed in the high elongation, low modulus material, which elongate slots are aligned, and in fluid communication, with the rows of apertures in the conveyor belt. A flexible manifold system, having a plurality of flexible tubes, is in fluid communication with the elongate slots of the compliant deck and the vacuum source for developing a pressure differential across each of the mailpieces when in contact with the drive surface of the conveyor belt.
1. A vacuum conveyance/manifold system for processing mailpieces, comprising:
at least one conveyor belt rotating around a plurality of drive rollers, the conveyor belt having rows of aligned apertures disposed therein and a drive surface for engaging a face surface of each of the mailpieces for conveyance along the feed path,
a compliant deck disposed beneath and supporting an underside surface of the at least one conveyor belt, the compliant deck, furthermore, defining a neutral axis in bending and having a high elongation, low modulus material in a portion of the deck which is distal from the bending neutral axis, and a high yield strength, high modulus material in a portion of the deck which lies coincident with the bending neutral axis, the compliant deck, furthermore, having a plurality of elongate slots formed in the high elongation, low modulus material, the elongate slots being aligned, and in fluid communication, with the rows of apertures disposed in the at least one conveyor belt,
a vacuum source, and
a flexible manifold system having a plurality of flexible tubes in fluid communication with the elongate slots of the compliant deck and the vacuum source for developing a pressure differential across each of the mailpieces when in contact with the drive surface.
2. The vacuum conveyance/manifold system according to claim 1 wherein the high elongation, low modulus material is Poly-Tetra-Flora-Ethylene (PFTE).
3. The vacuum conveyance/manifold system according to claim 1 wherein the high yield strength, high modulus material is spring steel.
4. The vacuum conveyance/manifold system according to claim 1 wherein the high elongation, low modulus material is Poly-Tetra-Flora-Ethylene (PFTE) and wherein the high yield strength, high modulus material is spring steel.
5. The vacuum conveyance/manifold system according to claim 1 wherein the compliant deck has a plurality of circular apertures in the high yield strength, high modulus material, and wherein the circular apertures are in fluid communication with the elongate slots.
6. The vacuum conveyance/manifold system according to claim 1 wherein the compliant deck comprises a multiple layers defining a mating interface therebetween, the interface permitting relative motion between the layers as the compliant deck flexes under load.
7. The vacuum conveyance/manifold system according to claim 5 wherein the compliant deck comprises a multiple layers defining a mating interface therebetween, and wherein the mating interface forms a seal between the layers in response to a pressure differential between the layers produced by the vacuum source.
8. The vacuum conveyance/manifold system according to claim 1 wherein the compliant deck includes a support layer and a surface layer, the support layer being fabricated from the high yield strength, high modulus material and the surface layer being fabricated from the high elongation, low modulus material, wherein the elongate slots are disposed in the surface layer, wherein a plurality of circular apertures are formed in the support layer and are in fluid communication with the elongate apertures, and wherein the flexible tubing is in fluid communication with the circular apertures of the support layer.
9. The vacuum conveyance/manifold system according to claim 8 wherein the high yield strength, high modulus material is spring steel.
10. The vacuum conveyance/manifold system according to claim 8 wherein the high elongation, low modulus material is Poly-Tetra-Flora-Ethylene (PFTE) and wherein the high yield strength, high modulus material is spring steel.
11. The vacuum conveyance/manifold system according to claim 10 wherein the compliant deck has a plurality of circular apertures in the high yield strength, high modulus material, and wherein the circular apertures are in fluid communication with the elongate slots.
12. A method for conveying mailpieces along a feed path comprising the steps of:
placing a face surface of each mailpiece on at least one conveyor belt driven around a plurality of drive rollers, the conveyor belt defining rows of aligned apertures and having a drive surface for receiving each of the mailpieces,
providing a compliant deck disposed beneath and supporting an underside surface of the at least one conveyor belt, the compliant deck, furthermore, defining a neutral axis in bending and having a high elongation, low modulus material in a portion of the deck which is distal from the bending neutral axis, and a high yield strength, high modulus material in a portion of the deck which lies coincident with the bending neutral axis, the compliant deck, furthermore, having a plurality of elongate slots formed in the high elongation, low modulus material, the elongate slots being aligned, and in fluid communication, with the rows of apertures disposed in the at least one conveyor belt, and
developing a pressure differential across each of the mailpieces to urge the face surface thereof into frictional engagement with the drive surface of the at least one conveyor belt to drive the mailpieces along the feed path.
13. The method according to claim 12 wherein the high elongation, low modulus material is Poly-Tetra-Flora-Ethylene (PFTE).
14. The method according to claim 12 wherein the high yield strength, high modulus material is spring steel.
15. The method according to claim 12 wherein the high elongation, low modulus material is Poly-Tetra-Flora-Ethylene (PFTE) and wherein the high yield strength, high modulus material is spring steel.
16. The method according to claim 12 wherein the compliant deck has a plurality of circular apertures in the high yield strength, high modulus material, and wherein the circular apertures are in fluid communication with the elongate slots.
17. The method according to claim 12 wherein the compliant deck comprises a multiple layers defining a mating interface therebetween, the interface permitting relative motion between the layers as the compliant deck flexes under load.
18. The method according to claim 16 wherein the compliant deck comprises a multiple layers defining a mating interface therebetween, and wherein the mating interface forms a seal between the layers in response to a pressure differential between the layers produced by the vacuum source.