ACTIVE SHEET-EDGE AIRFLOW CONTROL FOR VACUUM CONVEYORS

Abstract

A valve assembly for controlling airflow along sheet edges on a vacuum transport assembly including a platen including one or more holes arranged in rows in a cross process direction, and a belt displaceable with respect to the platen in a process direction, the valve assembly including a flexible plate, including a first end, a second end, a first top surface, and a first bottom surface, and a first actuator connected to the second end and operatively arranged to displace the flexible plate.

Claims

1. A valve assembly for controlling airflow along sheet edges on a vacuum transport assembly comprising a platen including one or more holes arranged in rows in a cross process direction, and a belt displaceable with respect to the platen in a process direction, the valve assembly comprising: a flexible plate, including: a first end; a second end; a first top surface; and, a first bottom surface; and, a first actuator connected to the second end and operatively arranged to displace the flexible plate.

2. The valve assembly as recited in claim 1, wherein the first actuator is a solenoid.

3. The valve assembly as recited in claim 2, wherein: the second end is connected to a bracket; the bracket is connected to the solenoid and a shaft; and, the solenoid is operatively arranged to rotate the second end about the shaft.

4. The valve assembly as recited in claim 1, wherein the first actuator is a motor.

5. The valve assembly as recited in claim 1, wherein: the platen comprises a second top surface and a second bottom surface; and, the first end connected to the second bottom surface.

6. The valve assembly as recited in claim 5, wherein the second end is connected to the second bottom surface.

7. The valve assembly as recited in claim 5, wherein: in a closed state of the valve assembly, the first top surface is engaged with the second bottom surface to close the one or more holes; and, in an open state of the valve assembly, the first top surface is disengaged from the second bottom surface such that the one or more holes are open.

8. The valve assembly as recited in claim 5, wherein: in a first closed state of the valve assembly, the first top surface is engaged with the second bottom surface to close a portion of holes in a first row of the rows, the portion of holes being less than the total number of holes in the first row; and, in a second closed state of the valve assembly, the first top surface is engaged with the second bottom surface to close all of the holes in the first row.

9. The valve assembly as recited in claim 1, further comprising a gasket connected to the first top surface.

10. The valve assembly as recited in claim 1, further comprising a valve adjustment assembly, including: a fulcrum operatively arranged to engage the first bottom surface; and, a second actuator operatively arranged to displace the fulcrum with respect to the flexible plate.

11. The valve assembly as recited in claim 10, wherein: the valve adjustment assembly further comprises a carriage translatably connected to the second actuator; and, the fulcrum is connected to the carriage.

12. The valve assembly as recited in claim 10, wherein the fulcrum is a roller.

13. The valve assembly as recited in claim 10, wherein the second actuator is a screw drive.

14. The valve assembly as recited in claim 1, wherein the flexible plate is a leaf spring.

15. A vacuum transport assembly, comprising: a platen, including: a first top surface; first bottom surface; and, one or more through-holes arranged in a cross process direction; a belt displaceable with respect to the platen in a process direction; and, a valve assembly, including: a plate aligned with the one or more through-holes, the plate including: a second top surface; a second bottom surface; a first end fixedly secured to the first bottom surface; and, a second end; and, a first actuator connected to the second end.

16. The vacuum transport assembly as recited in claim 15, wherein the first actuator is operatively arranged to displace the plate relative to the first bottom surface.

17. The vacuum transport assembly as recited in claim 15, wherein: in a closed state of the valve assembly, the second top surface is engaged with the first bottom surface to close the one or more holes; and, in an open state of the valve assembly, the second top surface is disengaged from the first bottom surface such that the one or more holes are open.

18. The vacuum transport assembly as recited in claim 15, further comprising a valve adjustment assembly, including: a fulcrum engaged with the second bottom surface; and, a second actuator operatively arranged to displace the fulcrum with respect to the plate.

19. The vacuum transport assembly as recited in claim 18, wherein the fulcrum forces the plate into contact with the platen at a position along the plate such that: a first portion of the plate extending from the first end to the position abuts against the first bottom surface; and, a second portion of the plate extending from the position to the second end is displaceable with respect to the first bottom surface.

20. The vacuum transport assembly as recited in claim 19, wherein the first portion of the plate closes a portion of holes in a first row of the rows, the portion of holes being less than the total number of holes in the first row.

21. The vacuum transport assembly as recited in claim 15, wherein the first actuator is connected to the second end via a cam.

22. The vacuum transport assembly as recited in claim 15, wherein: in a first closed state of the valve assembly, the first top surface is engaged with the second bottom surface to close a portion of holes in a first row of the rows, the portion of holes being less than the total number of holes in the first row; and, in a second closed state of the valve assembly, the first top surface is engaged with the second bottom surface to close all of the holes in the first row.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various embodiments are disclosed, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, in which:

[0028] FIG. 1 shows detail views of defects on a printed sheet;

[0029] FIG. 2 shows a stack of sheets with a contaminated edge;

[0030] FIG. 3A is a perspective view of a vacuum transport assembly;

[0031] FIG. 3B is a partial top elevational view of the vacuum transport assembly shown in FIG. 3A;

[0032] FIG. 3C is a simplified cross-sectional schematic view of the vacuum transport assembly taken generally along line 3C-3C in FIG. 3A;

[0033] FIGS. 4A-O are partial top elevational views illustrating various states of holes in a platen of a vacuum transport assembly as sheets pass therealong;

[0034] FIG. 5 is a perspective view of a vacuum transport assembly with the belt removed;

[0035] FIG. 6 is a detail view of the vacuum transport assembly taken generally along Detail 6 in FIG. 5;

[0036] FIG. 7 is a perspective view of a valve assembly;

[0037] FIG. 8 is a perspective view of a valve adjustment assembly;

[0038] FIG. 9A is a schematic cross-sectional view of the vacuum transport assembly taken generally along line 9-9 in FIG. 5, with the valve in an open position;

[0039] FIG. 9B is a schematic cross-sectional view of the vacuum transport assembly taken generally along line 9-9 in FIG. 5, with the valve in a closed position;

[0040] FIG. 10A is a schematic cross-sectional view of the vacuum transport assembly taken generally along line 10-10 in FIG. 5, with the valve in an open position;

[0041] FIG. 10B is a schematic cross-sectional view of the vacuum transport assembly taken generally along line 10-10 in FIG. 5, with the valve in a closed position;

[0042] FIGS. 11A-12B are partial bottom perspective views of a vacuum transport assembly showing the valve assemblies and valve adjustment assemblies in various positions;

[0043] FIG. 13 is a partial bottom perspective view of a vacuum transport assembly;

[0044] FIG. 14A is a front perspective view of a vacuum transport assembly;

[0045] FIG. 14B is a partial front perspective view of the vacuum transport assembly shown in FIG. 14A;

[0046] FIGS. 15A-D are detailed rear perspective views of the vacuum transport assembly shown in FIG. 14B, with the valves in various positions;

[0047] FIG. 16 is a schematic view of a vacuum transport assembly;

[0048] FIG. 17 is a functional block diagram illustrating an environment, in accordance with some embodiments of the present disclosure;

[0049] FIG. 18 is a flow chart depicting operational steps for controlling airflow along sheet edges; and,

[0050] FIG. 19 is a block diagram of internal and external components of a computer system, in accordance with some embodiments of the present disclosure.

DETAILED DESCRIPTION

[0051] At the outset, it should be appreciated that like drawing numbers on different drawing views identify identical, or functionally similar, structural elements. It is to be understood that the claims are not limited to the disclosed aspects.

[0052] Furthermore, it is understood that this disclosure is not limited to the particular methodology, materials and modifications described and as such may, of course, vary. It is also understood that the terminology used herein is for the purpose of describing particular aspects only, and is not intended to limit the scope of the claims.

[0053] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which this disclosure pertains. It should be understood that any methods, devices or materials similar or equivalent to those described herein can be used in the practice or testing of the example embodiments. The assembly of the present disclosure could be driven by hydraulics, electronics, pneumatics, and/or springs.

[0054] It should be appreciated that the term “substantially” is synonymous with terms such as “nearly,” “very nearly,” “about,” “approximately,” “around,” “bordering on,” “close to,” “essentially,” “in the neighborhood of,” “in the vicinity of,” etc., and such terms may be used interchangeably as appearing in the specification and claims. It should be appreciated that the term “proximate” is synonymous with terms such as “nearby,” “close,” “adjacent,” “neighboring,” “immediate,” “adjoining,” etc., and such terms may be used interchangeably as appearing in the specification and claims. The term “approximately” is intended to mean values within ten percent of the specified value.

[0055] It should be understood that use of “or” in the present application is with respect to a “non-exclusive” arrangement, unless stated otherwise. For example, when saying that “item x is A or B,” it is understood that this can mean one of the following: (1) item x is only one or the other of A and B; (2) item x is both A and B. Alternately stated, the word “or” is not used to define an “exclusive or” arrangement. For example, an “exclusive or” arrangement for the statement “item x is A or B” would require that x can be only one of A and B. Furthermore, as used herein, “and/or” is intended to mean a grammatical conjunction used to indicate that one or more of the elements or conditions recited may be included or occur. For example, a device comprising a first element, a second element and/or a third element, is intended to be construed as any one of the following structural arrangements: a device comprising a first element; a device comprising a second element; a device comprising a third element; a device comprising a first element and a second element; a device comprising a first element and a third element; a device comprising a first element, a second element and a third element; or, a device comprising a second element and a third element.

[0056] Moreover, as used herein, the phrases “comprises at least one of” and “comprising at least one of” in combination with a system or element is intended to mean that the system or element includes one or more of the elements listed after the phrase. For example, a device comprising at least one of: a first element; a second element; and, a third element, is intended to be construed as any one of the following structural arrangements: a device comprising a first element; a device comprising a second element; a device comprising a third element; a device comprising a first element and a second element; a device comprising a first element and a third element; a device comprising a first element, a second element and a third element; or, a device comprising a second element and a third element. A similar interpretation is intended when the phrase “used in at least one of:” is used herein.

[0057] “Printer,” “printer system,” “printing system,” “printer device,” “printing device,” and “multi-functional device (MFD)” as used herein encompass any apparatus, such as a digital copier, bookmaking machine, facsimile machine, multi-function machine, etc., which performs a print outputting function for any purpose.

[0058] As used herein, “sheet,” “web,” “substrate,” “printable substrate,” and “media” refer to, for example, paper, transparencies, parchment, film, fabric, plastic, photo-finishing papers, or other coated or non-coated substrate media in the form of a web upon which information or markings can be visualized and/or reproduced. By specialty sheet it is meant a sheet which includes a card, label, sticker, pressure seal envelopes, mailers, or other element that is thicker than the substrate on or in which it resides.

[0059] “Printed sheet” as used herein is a sheet on which an image is printed as part of the print job.

[0060] As used herein, “process direction” is intended to mean the direction of media transport through a printer or copier, while “cross process direction” is intended to mean the perpendicular to the direction of media transport through a printer or copier.

[0061] Referring now to the figures, FIG. 3A is a perspective view of marker transport assembly 10. FIG. 3B is a partial top elevational view of marker transport assembly 10. FIG. 3C is a simplified cross-sectional schematic view of marker transport assembly 10 taken generally along line 3C-3C in FIG. 3A. Marker transport assembly 10 comprises vacuum 12, belt 14 arranged on a plurality of rollers 16, a plurality of marker modules 18, and a platen 20. Perforated belt 14 is driven over platen 20 by rollers 16 in process direction D1. Vacuum 12 is connected to platen 20 and draws air through belt 14 and platen 20 via a vacuum system. Platen 20 comprises inboard side 22A, lead side 22B, outboard side 22C, and trail side 22D, plurality of holes 24 through which air is drawn by vacuum 12. Marker modules 18 are arranged over platen 20 to apply ink to sheets (i.e., the printing process). In some embodiments, marker transport assembly 10 comprises marker modules 18A-D arranged over zones 26A-D of platen 20, respectively. Each of marker modules 18A-D may comprise one or more print heads. For example, marker module 18A comprises three print heads arranged over zone 26A. In each of zones 26A-D, holes 24 are arranged in two or more partitions or rows. For example, and as shown in FIG. 3B, the print head #1 and print head #3 are arranged over first partition of holes 24 and the print head #2 is arranged over second partition of holes 24. Once a sheet is acquired at acquisition roller 30, vacuum 12 provides the necessary hold-down force to transport sheets under marker modules 18A-D. The sheets are typically aligned on their outboard edge with registration edge 28. There are no holes 22 outboard of registration edge 28 in platen 20, and thus in registered printing systems the outboard edge of the sheet is not exposed to the airflow from vacuum 12.

[0062] FIGS. 4A-O are partial top elevational views illustrating various states of holes 24 in platen 20 of vacuum transport assembly 10 as sheets 1, 5 pass therealong. Belt 14 is shown cutaway such that partitions 32A-38B can be seen more clearly. As previously described, one or more print heads are arranged over partitions 32A-38B. As a sheet passes along platen 20 via belt 14, and thus under marker modules 18A-D, it is an object of the present disclosure to stop the flow of air at the edges of the sheet under marker modules 18A-D. To do this, holes 24 are actively and selectively closed and opened, as will be described in greater detail below.

[0063] As shown in FIG. 4A, each of zones 26A-D comprises two rows or partitions of holes 24. “Partition” as used herein means one group or section of holes 24. Specifically, zone 26A includes partitions 32A-B, zone 26B includes partitions 34A-B, zone 26C includes partitions 36A-B, and zone 26D includes partitions 38A-B. While the partitions are shown in linear rows (i.e., holes 24 are linearly aligned), they may be arranged in any manner suitable for operation with valve assembly 50, for example, a curvilinear line or a geometric shape such as a square, triangle, rectangle, etc.

[0064] As shown in FIG. 4B, when no sheet is arranged on platen 20 or immediately incoming, all partitions are enabled, as indicated by check marks (✓). When a partition or a portion of the partition is enabled or turned on, holes 24 within that partition or portion are open, and thus air passes through those open holes enabling vacuum/suction. When a partition or a portion of the partition is disabled or shut off, the holes within that partition or portion are closed, and thus air does not pass through those closed holes disabling vacuum/suction. It should be appreciated that a portion of a partition may be enabled and a portion of the same partition may be disabled, as will be described in greater detail below.

[0065] When sheet 1 is immediately incoming, as shown in FIG. 4C, portions of partitions 32A-38B inboard of inboard edge 2A (i.e., the portion between inboard edge 2A and inboard side 22A, or line 29, in inboard direction D3) are disabled. The disabled portions of partitions 32A-38B are indicated by exes (X). By disabling these portions, a second registered edge is created at line 29, similar to that of registered edge 28. This is desirable in order to prevent the flow of air at inboard edge 2A as sheets pass along platen 20. To disable these portions, holes 24 in these portions are closed via leaf springs 52, specifically, by displacing fulcrums 82 in outboard direction D2 until they are aligned with inboard edge 2A, or line 29. Operation of valve assemblies 50 and valve adjustment assemblies 80 will be described in greater detail below. It should be appreciated that the portions of partitions 32A-38B inboard of line 29 will remain disabled for the duration of the print job, or until a different size sheet is to be printed, at which point fulcrums 82 will be adjusted, and thus line 29 moved, to the inboard edge of the different size sheet.

[0066] Just prior to lead edge 2B entering zone 26A, as shown in FIG. 4D, portions of partitions 32A-B between line 29 to registration edge 28 are disabled by closing holes 24 arranged therein. To shut off these portions, actuators 64 displace leaf springs 64 such that they abut against the bottom surface of platen 20 and prevent air from passing through holes 24 in those portions. Operation of leaf springs 52 and actuators 64 will be described in greater detail below.

[0067] Both partition 32A and partition 32B remain off when lead edge 2B is aligned with partition 32A, as shown in FIG. 4E. As shown in FIG. 4F, when lead edge 2B is aligned with partition 32B (i.e., lead edge 2B has surpassed partition 32A), partition 32A is turned on thereby enabling the vacuum through holes 24 therein. It is desirable that the partitions be enabled whenever possible to maintain as much vacuum/suction on sheet 1 as possible.

[0068] As shown in FIG. 4G, when lead edge 2B surpasses partition 32B, partition 32B is also turned on and thus vacuum through holes 24 in both partitions 32A-B are enabled. Additionally, portions of partitions 34A-B between line 29 and registered edge 28 are disabled in anticipation of lead edge 2B passing thereover (i.e., the vacuum/suction through holes 24 in partitions 34A-B is disabled).

[0069] As shown in FIG. 4H, lead edge 2B is aligned with partition 34A and thus partitions 34A-B remain disabled. Additionally, sheet 5 is shown as approaching platen 20.

[0070] As shown in FIG. 4I, partition 32A is disabled as trail edge 2D approaches, but partition 32B remains enabled. Additionally, lead edge 2B is aligned with partition 34B and as such, partition 34B remains disabled and partition 34A is enabled.

[0071] As shown in FIG. 4J, lead edge 2B has surpassed partition 34B and as such, partition 34B is enabled. Trail edge 2D is aligned with partition 32A, which is still disabled. Additionally, partition 32B is disabled in anticipation of alignment with trail edge 2D (i.e., partition 32B is disabled just prior to trail edge 2D passing thereover).

[0072] As shown in FIG. 4K, lead edge 2B is aligned with partition 36A, which is disabled. Partition 36B is also disabled in anticipation of alignment with lead edge 2B. Partitions 34A-B are enabled as no edges of sheet 1 are close to alignment therewith. Trail edge 2D is aligned with partition 32B, which is disabled. Additionally, partition 32A is disabled in anticipation of alignment with lead edge 6B of sheet 5.

[0073] As shown in FIG. 4L, lead edge 2B is aligned with partition 36B, which is disabled. Partitions 36A and 34A-B are enabled. Partitions 32A-B are disabled in anticipation of alignment with lead edge 6B.

[0074] As shown in FIG. 4M, lead edge 2B has surpassed partition 36B and thus partitions 36A-B are enabled. Partitions 38A-B are disabled in anticipation of alignment with lead edge 2B. Trail edge 2D is aligned with partition 34A and thus partitions 34A-B are disabled. Additionally, lead edge 6B is aligned with partition 32A and thus partitions 32A-B remain disabled.

[0075] As shown in FIG. 4N, lead edge 2B is aligned with partition 38A and thus partitions 38A-B remain disabled. Partitions 36A-B are enabled. Trail edge 2D is aligned with partition 34B, which is disabled. Lead edge 6B is aligned with partition 32B, which is disabled. Additionally, partition 34A is disabled in anticipation of alignment with lead edge 6B. Since lead edge 6B has surpassed partition 32A, partition 32A is enabled.

[0076] As shown in FIG. 4O, lead edge is aligned with partition 38B, which is disabled. Partitions 38A and 36B are enabled. Partition 36A is disabled in anticipation of alignment with trail edge 2D. Partitions 34A-B are disabled in anticipation of alignment with lead edge 6B. Lead edge 6B has surpassed partition 32B, and thus partitions 32A-B are enabled.

[0077] FIG. 5 is a perspective view of vacuum transport assembly 10 with belt 14 removed for simplicity. FIG. 6 is a detail view of vacuum transport assembly 10 taken generally along Detail 6 in FIG. 5. Zones 126A-D demonstrate the target areas for air suction/vacuum shut off located under the print heads (refer to FIG. 3B for an example arrangement of print heads). Each zone, for example zone 126A, comprises a plurality of holes 124A in fluid communication with respective channels 124B. Channels 124B extend from top surface 121A of platen 120 at least partially to bottom surface 121B. Holes 124A extend from bottom surface 121B of platen 120 to channels 124B. Air is sucked from top surface 121A through channels 124B and then through holes 124A to an area under bottom surface 121B. As best shown in FIG. 6, in some embodiments, each channel 124B is in fluid communication with only one hole 124A such that, when said one hole 124A is closed, there is no airflow through the closed hole 124A or its respective channel 124B. This will be described in greater detail below. In some embodiments, each channel 124B is in fluid communication with a plurality of holes 124A. In some embodiments, each hole 124A is in fluid communication with a plurality of channels 124B.

[0078] FIG. 7 is a perspective view of valve assembly 50. Valve assembly 50 generally comprises at least one leaf spring or valve or (flexible) plate 52 and actuator 64. In some embodiments, valve assembly 50 comprises two leaf springs 52, each connected to a respective actuator, operatively arranged to enable and disable partitions 132A-B (see FIG. 6).

[0079] Plate 52 comprises top surface 54, bottom surface 56, end 58, and end 60. Top surface 54 is operatively arranged to engage bottom surface 121B to open and close holes 124A to disable vacuum in a partition or a portion of a partition. In some embodiments, top surface 54 comprises gasket 62 to provide for a better seal between leaf spring 52 and platen 120 and thus closure of holes 124A. End 58 is connected, for example fixedly secured, to platen 120. In some embodiments, end 58 is connected to bottom surface 121B via connector or clamp or bar 72 (see FIGS. 9A-13). End 60 is connected to actuator 64, for example, via bracket 66 and/or shaft 68. In some embodiments, and as best shown in FIG. 7, end 60 is arranged at an angle relative to bottom surface 56, for example at approximately 135 degrees. This angled portion is connected to bracket 66. Bracket 66 is connected to actuator 64, which is operatively arranged to rotate bracket 66 about an axis, for example shaft 68. For example, in some embodiments, actuator is a solenoid with a plunger that displaces linearly. The plunger is connected to bracket 66 and when plunger is displaced linearly, bracket 66 rotates about shaft 68. In some embodiments, and as will be describe in greater detail below, actuator 64 may comprise any actuation mechanism suitable for rotating end 68 about an axis (i.e., shaft 68), for example, a motor. Bracket 66, and specifically shaft 68, is rotatably connected to platen 120 via one or more brackets 70 (see FIGS. 11A-13).

[0080] In some embodiments, when actuator 64 is in a first state (e.g., de-energized), top surface 54 is separated from bottom surface 121B and holes 124A in the partition aligned with leaf spring 52 are open (i.e., the partition is enabled). When actuator 64 is in a second state (e.g., energized), top surface is engaged with and/or abuts against bottom surface 121B and holes 124A in the partition aligned with leaf spring 52 are closed (i.e., the partition is disabled). In some embodiments, leaf spring 52 is biased to the open position (i.e., holes 124A are open). In some embodiments, plate 52 is a flexible plate and is not biased to any position, but rather actuator engages and disengages plate 52 with bottom surface 121B.

[0081] FIG. 8 is a perspective view of valve adjustment assembly 80. Valve adjustment assembly 80 comprises fulcrum or pinch element or roller 82 operatively arranged to engage bottom surface 56 to adjust the active length of plate 52. By “active length” it is meant the portion of plate 52 that can be engaged and disengaged with bottom surface 121B via actuator 64. Fulcrum 82 linearly displaceable along bottom surface 56 and set at the inboard edge of the sheet or sheets of the print job, thus disabling all holes 124A of the partition between end 58 and fulcrum 82. In some embodiments, fulcrum 82 is displaceable via bracket or carriage 84 and actuator 86. For example, fulcrum 82 is rotatably connected to carriage 84 via shaft 92. Carriage 84 is linearly displaceable along plate 52 via actuator or screw drive 86. Actuator 86 is threadably engaged with carriage 84 and guide shaft is slidably engaged with carriage. Thus, as actuator 86 is rotated, carriage 84 linearly displaces therealong. In some embodiments, carriage 84 further comprises spring 94 connected to shaft 90 and operatively arranged to bias roller 82 up against plate 52. In some embodiments, carriage 84 comprises two fulcrums 82 that engage two plates 52 (i.e., on carriage 84 is capable of adjusting the active length of the valves in one zone or two partitions).

[0082] FIG. 9A is a schematic cross-sectional view of vacuum transport assembly 10 taken generally along line 9-9 in FIG. 5, with valve 52 in an open position. As shown, fulcrum 82 has been displaced from end 58 in outboard cross process direction D2 to line 29. Line 29 is aligned with inboard edge 2A, and together with registered edge 28, represents width W1 of sheet 1 in the cross process direction. Positioning fulcrum 82 at line 29 effectively closes all holes 124A and their respective channels 124B between end 58 and line 29, disabling that portion of the partition (i.e., plate 52 abuts against bottom surface 121B in that portion of the partition). The portion of the partition between line 29 and registered edge 28, however, is enabled (i.e., plate 52 does not abut against bottom surface 121B in that portion of the partition). Vacuum 12 draws air through the open holes 124A and channels 124B.

[0083] FIG. 9B is a schematic cross-sectional view of vacuum transport assembly 10 taken generally along line 9-9 in FIG. 5, with valve 52 in a closed position. As shown, actuator 64 has rotated end 60 in a first circumferential direction, which in turn displaces plate 52 such that it abuts against bottom surface 121B and blocks holes 124B arranged between line 29 and registered edge 28 (i.e., disables the portion of the partition between line 29 and registered edge 28). Vacuum 12 cannot draw air through any holes 124A or channels 124B.

[0084] FIG. 10A is a schematic cross-sectional view of vacuum transport assembly 10 taken generally along line 10-10 in FIG. 5, with valve 52 in an open position. Similar to FIG. 9A, fulcrum 82 is displaced to line 29; however, line 29 is arranged closer to registered edge 28 reflective of width W2 of sheet 1, width W2 being less than width W1. Actuator 64 maintains plate 52 in an open position such that, between line 29 and registered edge 28, plate 52 is separated from bottom surface 121B and holes 124A and channels 124B are open. FIG. 10B is a schematic cross-sectional view of vacuum transport assembly 10 taken generally along line 10-10 in FIG. 5, with valve 52 in a closed position. Actuator 64 is rotated end 60 in a first circumferential direction to displace plate 52 into abutment with bottom surface 121B, thus closing holes 124A and channels 124B and disabling the partition. In some embodiments, when plate 52 is in an open position, end 60 abuts against bottom surface 121B, and when plate 52 is in a closes position, end 60 is separated from bottom surface 121B.

[0085] FIGS. 11A-12B are partial bottom perspective views of vacuum transport assembly 10 showing valve assemblies 50 and valve adjustment assemblies 80 in various positions. As shown in FIGS. 11A-B, fulcrums 82 are arranged toward ends 58 of valves 52A-B. In FIGS. 12A-B, fulcrums 82 are displaced in outboard cross process direction D2, thereby shortening the active length of valves 52A-B. In some embodiments, fulcrums 82 are displaced by rotating drive screw 86.

[0086] FIG. 11A shows both of valves 52A-B in the open position, and thus holes 124A aligned with valves 52A-B, and their respective channels 124B, are open. In some embodiments, valves 52A-B remain in the open position when actuators 64A-B are not energized (i.e., valves 52A-B are leaf springs biased toward the open position). FIG. 11B shows valve 52A in the closed position and valve 52B in the open position. Actuator 64A is energized thereby rotating bracket 66 and end 60 such that valve 52A abuts against bottom surface 121B and closes holes 124A aligned therewith, and their respective channels. FIG. 12A shows both of valves 52A-B in the open position, and thus holes 124A aligned with valves 52A-B, and their respective channels 124B, are open. FIG. 12B shows valve 52A in the closed position and valve 52B in the open position.

[0087] FIG. 13 is a partial bottom perspective view of vacuum transport assembly 10. As shown, vacuum transport assembly 10 comprises eight valves 52 operatively arranged to enable and disable eight partitions (e.g., partitions 32A-28B). Each of valves 52 comprises a respective actuator 64. Vacuum transport assembly 10 further comprises four valve adjustment assemblies 80, or eight fulcrums 82. Valve adjustment assemblies 80 are controlled by actuator or motor 100. Specifically, drive screws 86 are connected to belt or gear system 104, which is connected to drive shaft 102. Actuator 100, drive shaft 102, belt system 104, and drive screws 86 are non-rotatably connected meaning, as one component rotates, all components rotate. Thus, as actuator 100 rotates drive screws 86 rotate thereby displacing carriages 84 and fulcrums 82 linearly along valves 52. The system shown in FIG. 13 allows the inboard registered edge to be set based on the width of the sheets (i.e., closes all holes 124A inboard of the inboard edge of the sheet).

[0088] FIG. 14A is a front perspective view of vacuum transport assembly 10. FIG. 14B is a partial front perspective view of vacuum transport assembly 10, with platen 20 including holes 24 removed. FIGS. 15A-D are detailed rear perspective views of vacuum transport assembly 10 with valves 52A-B in various positions. In the embodiment shown in FIGS. 14A-15D, vacuum transport assembly 10 comprises one or more valves (e.g., valves 52A-B), and carriage 84 comprising one or more fulcrums 82 engaged with the valves. Actuator or motor 100 is operatively arranged to displace the valve adjustment assembly, namely, fulcrums 82, along valves 52, as previously described. Vacuum transport assembly 10 further comprises actuator or motor 64 operatively arranged to rotate shaft 106. Shaft 106 is connected to motor 64 at a first end and to cams 108A-B at a second end. Thus, as motor 64 rotates, cams 108A-B rotate. Cams 108A-B engage brackets 66 of valves 52A. For example, each of brackets 66 comprises a wheel rotatably connected thereto. The wheel engages its respective cam 108A, 108B. Cam 108A comprises projection or raised lip 110A and cam 108B comprises projection or raised lip 110B. Raised lips 110A-B engage brackets 66 and rotatably displace them so as to move valves 52A-B between the open position and the closed position, respectively. In some embodiments, springs 112 bias brackets 66 in a first circumferential direction and thus bias valves 52A-B toward a closed position. When projections 110A-B engage their respective brackets 66, brackets 66 are displaced in a second circumferential direction, opposite the first circumferential direction, thus moving valves 52A-B to the open position. Cams 108A-B and their respective projections 110A-B are arranged such that valves 52A-B can exhibit four states, as described below.

[0089] FIGS. 14B and 15A illustrate a first state of valves 52A-B. In the first state, projection 110A and projection 110B are not engaged with their respective brackets 66 and as such, springs 112 bias brackets 66 and valves 52A-B into the closed position.

[0090] FIG. 15B shows a second state of valves 52A-B. In the second state, projection 110A is engaged with its respective bracket 66 thereby rotating bracket 66 and moving valve 52A to the open position. Projection 110B is not engaged with its respective bracket 66 and as such, spring 112 biases bracket 66 and valve 52B into the closed position.

[0091] FIG. 15C shows a third state of valves 52A-B. In the third state, projection 110A and projection 110B are engaged with their respective brackets 66 thereby rotating brackets 66 and moving both of valves 52A-B to the open position.

[0092] FIG. 15D shows a fourth state of valves 52A-B. In the fourth state, projection 110B is engaged with its respective bracket 66 thereby rotating bracket 66 and moving valve 52B to the open position. Projection 110A is not engaged with its respective bracket 66 and as such, spring 112 biases bracket 66 and valve 52A into the closed position. Thus, by using a camming system as shown, one actuator (e.g., motor 64) can be used to control a plurality of valves (e.g., valves 52A-B), which may be desirable instead of using one actuator for every valve.

[0093] FIG. 16 is a schematic view of vacuum transport assembly 210. Similar to vacuum transport assembly 10, vacuum transport assembly 210 comprises platen 120 comprising top surface 121A, bottom surface 121B, inboard side 122A, outboard side 122C, holes 124A, channels 124B, vacuum 12, and valve 52 engageable with bottom surface. Vacuum transport assembly 210 further comprises fulcrums 182A-B engaged with and displaceable along valve 52. This arrangement is desirable for center-registered printing systems when all edges (i.e., lead, trail, inboard, and outboard) are exposed to vacuum. Thus, fulcrum 182A is displaced along valve 52 in a cross process direction and aligned with inboard edge 2A of sheet 1. This closes holes 124A and channels 124B between inboard side 122A and inboard edge 2A. Fulcrum 182B is displaced along valve 52 in a cross process direction and aligned with outboard edge 2C of sheet 1. This closes holes 124A and channels 124B between outboard side 122C and outboard edge 2C. Vacuum transport assembly 210 further comprises actuator 164 operatively arranged to move the enable and disable the portion of the partition between fulcrums 182A and 182B (i.e., to close holes 124A and channels 124B between fulcrums 182A-B).

[0094] It should be appreciated that the method and assemblies disclosed herein can be controlled by a controller or computing device. For example, a controller may communicate with one or more sensors that detect sheets entering and passing through vacuum transport assembly 10. Based on detection of the size and location of the sheet, via the one or more sensors, the controller adjusts the active length of valves 52 via valve adjustment assemblies 80, and opens and closes valves 52 via actuators to enable and disable specific partitions, respectively. As such, the controller can be programmed with software or program instructions to carry out the method disclosed herein. In some embodiments, controller receives information related to a print job, for example, sheet size, total number of sheets, distance between each sheet when moving in the process direction D1, etc. Based on this information, controller adjusts the active length of valves 52 via valve adjustment assemblies 80 and opens and closes valves 52 based on a precalculated location of the sheets (i.e., based on the time the first sheet is to enter platen 20 and the separation between each sheet).

[0095] FIG. 17 is a functional block diagram illustrating a sheet edge airflow control environment, generally environment 300, in accordance with some embodiments of the present disclosure. FIG. 17 provides only an illustration of one implementation, and does not imply any limitations with regard to the environments in which different embodiments may be implemented. Many modifications to the depicted environment may be made by those skilled in the art without departing from the scope of the disclosure as recited by the claims. In some embodiments, environment 300 includes one or more of the following connected to network 310: computing device 400, sensor 320, input data 330, and vacuum transport assembly 10. In some embodiments, environment 300 further comprises valve assembly 50 and/or valve adjustment assembly 80, which may be included on or as a separate component from vacuum transport assembly 10. In some embodiments, environment 300 may further comprise or communicate with a print server or central controller, which communicates with vacuum transport assembly 10 and/or computing device 400 regarding print jobs.

[0096] Network 310 can be, for example, a local area network (LAN), a wide area network (WAN) such as the Internet, or a combination of the two, and can include wired, wireless, or fiber optic connections.

[0097] Computing device 400 may be a hardware device that controls airflow along the edges of sheets passing over or through vacuum transport assembly 10 using airflow control program 340. Computing device 400 is capable of communicating with network 310, sensor 320, input data 330, and vacuum transport assembly 10, and in some embodiments, a print server. In some embodiments, computing device 400 may include a computer. In some embodiments, computing device 400 may include internal and external hardware components, as depicted and described in further detail with respect to FIG. 19. In some embodiments, airflow control program 340 is implemented on a web server, which may be a management server, a web server, or any other electronic device or computing system capable of receiving and sending data. The web server can represent a computing system utilizing clustered computers and components to act as a single pool of seamless resources when accessed through a network. The web server may include internal and external hardware components, as depicted and described in further detail with respect to FIG. 19.

[0098] Airflow control program 340 is primarily installed on computing device 400, although it may additionally or alternatively be installed on vacuum transport assembly 10. Airflow control program 340 is operatively arranged to, based on a size and position of a sheet on vacuum transport assembly 10, enable and disable airflow about the edges of the sheet, as previously described. In some embodiments, airflow control program 340 receives sheet size and or position from sensor 320. In some embodiments, airflow control program 340 receives information related to the print job, for example from input data 330 or a print server. This information may include how many sheets are to be printed, the sheet size, the spacing between each sheet on the belt, and other data. Airflow control program 340 uses this information to calculate what holes the sheet edges will encounter and at what time, and disable and enable those holes at specific times such that airflow is disabled along the sheet edges.

[0099] Sensor 320 is operatively arranged to detect a position of the sheets within vacuum transport assembly as well as outside of vacuum transport assembly 10, for example, just prior to entering vacuum transport assembly 10. In some embodiments, sensor 320 is also arranged to detect the size of the sheet. Sensor 320 may include any sensor suitable to perform these functions, for example, proximity sensors, optical sensors, position sensors, etc.

[0100] Input data 330 is data inputted by a user or from a print job, for example, an input that includes the number and size of sheets in a print job, the spacing between sheets on the belt, and the speed of the sheets traveling through vacuum transport assembly 10. Airflow control program 340 can use this information to determine what holes the sheet edges will align with and when in order to disable and enable such holes.

[0101] FIG. 18 shows flow chart 350 depicting operational steps for controlling airflow along sheet edges, for example, while being transported under print heads in a printing system.

[0102] In step 352, airflow control program 340 receives information related to a sheet of a print job. This information can include sheet size and position, the number of sheets in a print job, spacing between sheets traveling on the belt, and speed of the sheets traveling on the belt,

[0103] In step 354, airflow control program 340 disables airflow at inboard edge 2A of sheet 1. As previously described, in some embodiments, valve adjustment assemblies 80 are displaced along valve assemblies 50 to line 29, which aligns with inboard edge 2A. This effectively closes all holes inboard of inboard edge 2A. In some embodiments, in step 354, airflow control program 340 alternatively or additionally disables airflow at outboard edge 2C (i.e., in center-registered printing systems).

[0104] In step 356, airflow control program 340 disables airflow at lead edge 2B of sheet 1. As previously described, just prior to lead edge 2B aligning with one or more holes, for example a partition or portion of holes, airflow control program 340 disables that partition to stop airflow through such holes. In some embodiments, the partition of holes is disabled by displacing valve assembly 50 into engagement with bottom surface 121B of platen 120. This partition of holes remains disabled when lead edge 2B is aligned therewith. After lead edge 2B surpasses the partition of holes, airflow control program 340 enables airflow through that partition of holes by releasing valve assembly 50 from engagement with platen 20, 120.

[0105] In step 358, airflow control program 340 disables airflow at trail edge 2D of sheet 1. As previously described, just prior to trail edge 2D aligning with one or more holes, for example a partition or portion of holes, airflow control program 340 disables that partition to stop airflow through such holes. In some embodiments, the partition of holes is disabled by displacing valve assembly 50 into engagement with bottom surface 121B of platen 120. This partition of holes remains disabled when trail edge 2D is aligned therewith. After trail edge 2D surpasses the partition of holes, airflow control program 340 enables airflow through that partition of holes by releasing valve assembly 50 from engagement with platen 20, 120.

[0106] FIG. 19 is a block diagram of internal and external components of computer system 400, which is representative of the computing device of FIG. 17, in accordance with some embodiments of the present disclosure. It should be appreciated that FIG. 19 provides only an illustration of one implementation and does not imply any limitations with regard to the environments in which different embodiments may be implemented. In general, the components illustrated in FIG. 19 are representative of any electronic device capable of executing machine-readable program instructions. Examples of computer systems, environments, and/or configurations that may be represented by the components illustrated in FIG. 17 include, but are not limited to, personal computer systems, server computer systems, thin clients, thick clients, laptop computer systems, tablet computer systems, cellular telephones (i.e., smart phones), multiprocessor systems, microprocessor-based systems, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments that include any of the above systems or devices.

[0107] Computing device 400 includes communications fabric 402, which provides for communications between one or more processing units 404, memory 406, persistent storage 408, communications unit 410, and one or more input/output (I/O) interfaces 412. Communications fabric 402 can be implemented with any architecture designed for passing data and/or control information between processors (such as microprocessors, communications and network processors, etc.), system memory, peripheral devices, and any other hardware components within a system. For example, communications fabric 402 can be implemented with one or more buses.

[0108] Memory 406 and persistent storage 408 are computer readable storage media. In this embodiment, memory 406 includes random access memory (RAM) 416 and cache memory 418. In general, memory 406 can include any suitable volatile or non-volatile computer readable storage media. Software is stored in persistent storage 408 for execution and/or access by one or more of the respective processors 404 via one or more memories of memory 406.

[0109] Persistent storage 408 may include, for example, a plurality of magnetic hard disk drives. Alternatively, or in addition to magnetic hard disk drives, persistent storage 408 can include one or more solid state hard drives, semiconductor storage devices, read-only memories (ROM), erasable programmable read-only memories (EPROM), flash memories, or any other computer readable storage media that is capable of storing program instructions or digital information.

[0110] The media used by persistent storage 408 can also be removable. For example, a removable hard drive can be used for persistent storage 408. Other examples include optical and magnetic disks, thumb drives, and smart cards that are inserted into a drive for transfer onto another computer readable storage medium that is also part of persistent storage 408.

[0111] Communications unit 410 provides for communications with other computer systems or devices via a network. In this exemplary embodiment, communications unit 410 includes network adapters or interfaces such as a TCP/IP adapter cards, wireless Wi-Fi interface cards, or 3G or 4G wireless interface cards or other wired or wireless communications links. The network can comprise, for example, copper wires, optical fibers, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. Software and data used to practice embodiments of the present disclosure can be downloaded to computing device 400 through communications unit 410 (i.e., via the Internet, a local area network, or other wide area network). From communications unit 410, the software and data can be loaded onto persistent storage 408.

[0112] One or more I/O interfaces 412 allow for input and output of data with other devices that may be connected to computing device 400. For example, I/O interface 412 can provide a connection to one or more external devices 420 such as a keyboard, computer mouse, touch screen, virtual keyboard, touch pad, pointing device, or other human interface devices. External devices 420 can also include portable computer readable storage media such as, for example, thumb drives, portable optical or magnetic disks, and memory cards. I/O interface 412 also connects to display 422.

[0113] Display 422 provides a mechanism to display data to a user and can be, for example, a computer monitor. Display 422 can also be an incorporated display and may function as a touch screen, such as a built-in display of a tablet computer.

[0114] The present disclosure may be a system, a method, and/or a computer program product. The computer program product may include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present disclosure.

[0115] The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. A non-exhaustive list of more specific examples of the computer readable storage medium includes the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or raised structures in a groove having instructions recorded thereon, and any suitable combination of the foregoing. A computer readable storage medium, as used herein, is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.

[0116] Computer readable program instructions described herein can be downloaded to respective computing/processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and/or a wireless network. The network may comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. A network adapter card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing/processing device.

[0117] Computer readable program instructions for carrying out operations of the present disclosure may be assembler instructions, instruction-set-architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++ or the like, and conventional procedural programming languages, such as the “C” programming language or similar programming languages. The computer readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate arrays (FPGA), or programmable logic arrays (PLA) may execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present disclosure.

[0118] Aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer readable program instructions.

[0119] These computer readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, a programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable storage medium having instructions stored therein comprises an article of manufacture including instructions which implement aspects of the function/act specified in the flowchart and/or block diagram block or blocks.

[0120] The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable apparatus, or other device implement the functions/acts specified in the flowchart and/or block diagram block or blocks.

[0121] The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts or carry out combinations of special purpose hardware and computer instructions.

[0122] It will be appreciated that various aspects of the disclosure above and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.

LIST OF REFERENCE NUMERALS

[0123] 1 Sheet [0124] 2A Inboard edge [0125] 2B Lead edge [0126] 2C Outboard edge [0127] 2D Trail edge [0128] 3 Stack [0129] 4 Stack edge [0130] 5 Sheet [0131] 6A Inboard edge [0132] 6B Lead edge [0133] 6C Outboard edge [0134] 6D Trail edge [0135] 10 Vacuum transport assembly [0136] 12 Vacuum [0137] 14 Belt [0138] 16 Rollers [0139] 18 Marker modules [0140] 18A Marker module [0141] 18B Marker module [0142] 18C Marker module [0143] 18D Marker module [0144] 20 Platen [0145] 22A Inboard side [0146] 22B Lead side [0147] 22C Outboard side [0148] 22D Trail side [0149] 24 Holes [0150] 26A Zone [0151] 26B Zone [0152] 26C Zone [0153] 26D Zone [0154] 28 Registration edge [0155] 29 Line [0156] 30 Acquisition roller [0157] 32A Row or partition of holes [0158] 32B Row or partition of holes [0159] 34A Row or partition of holes [0160] 34B Row or partition of holes [0161] 36A Row or partition of holes [0162] 36B Row or partition of holes [0163] 38A Row or partition of holes [0164] 38B Row or partition of holes [0165] 50 Valve assembly [0166] 52 Leaf spring or valve or plate [0167] 52A Leaf spring or valve or plate [0168] 52B Leaf spring or valve or plate [0169] 54 Top surface [0170] 56 Bottom surface [0171] 58 End [0172] 60 End [0173] 62 Gasket [0174] 64 Actuator or motor or solenoid [0175] 64A Actuator [0176] 64B Actuator [0177] 66 Bracket [0178] 68 Shaft [0179] 70 Bracket [0180] 72 Connector or clamp or bar [0181] 80 Valve adjustment assembly [0182] 82 Fulcrum or pinch element or roller [0183] 84 Bracket or carriage [0184] 86 Actuator [0185] 88 Guide shaft [0186] 90 Shaft [0187] 92 Shaft [0188] 94 Spring [0189] 100 Actuator [0190] 102 Drive shaft [0191] 104 Belt and/or gear system [0192] 106 Shaft [0193] 108A Cam [0194] 108B Cam [0195] 110A Projection or raised lip [0196] 110B Projection or raised lip [0197] 112 Spring(s) [0198] 120 Platen [0199] 121A Top surface [0200] 121B Bottom surface [0201] 122A Inboard side [0202] 122B Lead side [0203] 122C Outboard side [0204] 122D Trail side [0205] 124A Holes [0206] 124B Channels [0207] 126A Zone [0208] 126B Zone [0209] 126C Zone [0210] 126D Zone [0211] 132A Row or partition of holes [0212] 132B Row or partition of holes [0213] 164 Actuator [0214] 182A Fulcrum or pinch element or roller [0215] 182B Fulcrum or pinch element or roller [0216] 210 Vacuum transport assembly [0217] 300 Sheet edge airflow control environment [0218] 310 Network [0219] 320 Sensor [0220] 330 Input data [0221] 340 Airflow control program [0222] 350 Flowchart [0223] 352 Step [0224] 354 Step [0225] 356 Step [0226] 358 Step [0227] D1 Process direction [0228] D2 Outboard cross process direction [0229] D3 Inboard cross process direction [0230] W1 Width [0231] W2 Width