Right angle stager apparatus

Information

  • Patent Grant
  • 6557847
  • Patent Number
    6,557,847
  • Date Filed
    Thursday, February 14, 2002
    22 years ago
  • Date Issued
    Tuesday, May 6, 2003
    21 years ago
Abstract
A right-angle sheet stager apparatus for merging multiple input sheet streams into a single output sheet stream includes one or more input channels and an output channel. Each input channel includes a transport surface and a staging surface. Each transport surface communicates with its corresponding staging surface at a transitional member interposed between the transport surface and the staging surface. Each transitional member includes an upper surface disposed at an elevation greater than an elevation of the corresponding staging surface. The output channel includes an output surface, and is oriented in a right-angle relation with respect to the input channels and communicates with the input channels at a merger location. The stager apparatus permits a sheet from the transport surface to enter the staging surface and overlap with a preceding sheet already present on that staging surface, prior to the preceding sheet's complete exit from the staging surface.
Description




TECHNICAL FIELD




The present invention is directed to the handling of one or more streams of documents and, more particularly, is directed to the high-throughput staging of documents and right-angle turning of document streams.




BACKGROUND ART




Staging devices are utilized in a wide variety of document handling and mail processing operations. Such operations can involve a number of different modules or stations that perform specific tasks, such as accumulating, folding, printing, shearing, merging, envelope stuffing, and combinations thereof. These operations often require that sheets be physically turned 90 degrees at some point on the sheet path, yet still demand that a commercially acceptable level of throughput be maintained. Examples of systems in which sheets must be physically turned in order to effect a change in conveying direction are disclosed in U.S. Pat. Nos. 5,362,039 and 5,439,208.




In some of these operations, two or more sheet streams must be merged into a single stream. One example is the processing of two-up material, which can typically be provided on a 17 inch continuous roll. The width of the roll is such that two 8.5×11 inch printed pages are disposed in adjacent relation to each other. Several side-by-side pairs of such pages are contained in succession along the length of the roll.




A staging module is typically used whenever an application requires that one or more sheets in one or more process streams be paused or held for a certain period of time while other operations are performed, initialized, or reset. In operations such as those briefly described above, the use of a staging module can be useful for assisting in the synchronization of the various operations being conducted on the sheets. Unfortunately, a conventional staging module can slow down throughput to an unacceptable level. This is because a sheet residing in a conventional staging module must completely exit the staging area before the next sheet in the sheet stream can enter therein. As a result, some document handling systems that could benefit from the use of a staging module avoid such use altogether. Throughput is further slowed in conventional operations that require sheets to be physically rotated at some point along the process path.




It would therefore be advantageous to provide a sheet stager apparatus that is capable of permitting a high level of throughput and is consequently useful in a wide variety of document handling and mail processing operations without impeding such operations. It would be further advantageous to provide a high-throughput stager apparatus that has the additional ability of turning the sheet path 90 degrees without requiring sheets to be physically turned, thereby eliminating the need for a separate conventional sheet turning module.




DISCLOSURE OF THE INVENTION




The present invention provides a right-angle sheet stager apparatus for merging multiple input sheet streams into a single output sheet stream. In one embodiment according to the present invention, the stager apparatus comprises a plurality of input channels. Each input channel includes a transport surface and a staging surface. Each staging surface is disposed downstream of its corresponding transport surface. One of the staging surfaces is disposed at an elevation different from an elevation of one of the other staging surfaces. An output channel includes an output surface. The output channel is oriented in a right-angle relation with respect to the input channels and communicates with the input channels at a merger location.




In another embodiment according to the present invention, a right-angle sheet stager apparatus comprises a plurality of input channels. Each input channel includes a transport surface, a staging surface, and a transitional member interposed between the transport surface and the staging surface. Each staging surface is disposed downstream of its corresponding transport surface. One of the transitional members includes an upper surface disposed at an elevation greater than an elevation of its corresponding staging surface. An output channel includes an output surface. The output channel is oriented in a right-angle relation with respect to the input channels and communicates with the input channels at a merger location.




In yet another embodiment according to the present invention, a right-angle sheet stager apparatus comprises an inside input path including an inside transport surface and an inside staging surface. The inside staging surface has an elevation and communicates with the inside transport surface at an inside interface location. The inside interface location includes an upper surface having an elevation greater than the elevation of the inside staging surface. An outside input path includes an outside transport surface and an outside staging surface communicating with the outside transport surface at an outside interface location. The outside staging surface has an elevation different from the elevation of the inside staging surface. The outside interface location includes an upper surface having an elevation greater than the elevation of the outside staging surface. An output path includes an output surface. The output path is oriented in a right-angle relation with respect to the inside and outside input paths, and communicates with the inside and outside input paths at a merger location.




In a further embodiment according to the present invention, a document handling apparatus comprises an input path structure, an output path structure, and a staging and document turning assembly. The input path structure includes an input surface and a first document moving device disposed in operative engagement with the input surface. The output path structure is oriented perpendicularly with respect to the input path structure and includes an output surface. The staging and document turning assembly is interposed between the input path structure and the output path structure and includes a staging surface and a second document moving device. The staging surface defines an interface between the input surface and the output surface. The second document moving device is disposed in operative engagement with the staging surface and is oriented perpendicularly with respect to the first document moving device.




The present invention also provides a method for merging multiple input sheet streams into a single output sheet stream oriented at a right angle with respect to the input sheet streams. The method comprises the following steps. A staging area is provided and includes a plurality of staging surfaces disposed at different elevations. A plurality of sheets are fed in a plurality of input sheet streams into the staging area, wherein each input sheet stream communicates with a corresponding one of the staging surfaces. A sheet outfeed area is provided and includes an output surface in communication with each of the staging surfaces. A first sheet is staged on a first one of the staging surfaces. The first sheet is brought into contact with a sheet driving mechanism. The sheet driving mechanism is activated to transport the first sheet towards the outfeed area. A second sheet is permitted to enter the first staging surface and to overlap with the first sheet prior to transportation of the entire first sheet out of the staging area. The method can further comprise the step of permitting a plurality of sheets to enter the first staging surface and accumulate thereon prior to transportation of the first sheet out of the staging area.




In another method for merging multiple input sheet streams into a single output sheet stream oriented at a right angle with respect to the input sheet streams, a staging area includes a plurality of staging surfaces disposed at different elevations and each staging surface includes a sheet driving element operatively associated therewith. A plurality of sheets are fed in a plurality of input sheet streams into the staging area. Each input sheet stream communicates with a corresponding one of the staging surfaces. A sheet outfeed area is provided, and includes an output surface in communication with each of the staging surfaces. A first sheet is staged on a first one of the staging surfaces, and a second sheet is staged on a second one of the staging surfaces. The first sheet is brought into contact with the sheet driving element of the first staging surface, and the second sheet is brought into contact with the sheet driving element of the second staging surface. The sheet driving element of the first staging surface is activated to transport the first sheet towards the outfeed area in a direction substantially perpendicular to at least one of the input sheet streams. The sheet driving element of the second staging surface is also activated to transport the second sheet towards the outfeed area in a direction substantially perpendicular to at least one of the input sheet streams. The first and second sheets are then merged into a single output stream substantially perpendicular to at least one of the input sheet streams.




The method can further comprise the step of causing a subsequent sheet to enter the first staging surface and to overlap with the first sheet prior to transportation of the first sheet out of the staging surface. The method can also comprise the step of permitting a plurality of sheets to enter the first staging surface and accumulate thereon prior to transportation of the first sheet out of the staging area.




The method can still further comprise the step of causing sheets from one or more of the input sheet streams to overlap at merger location.




Accordingly, it is an object of the present invention to provide a right-angle sheet stager apparatus that is capable of achieving higher levels of throughput than conventional staging devices.




It is another object of the present invention to provide a sheet stager apparatus in which sheets are permitted to overlap in the staging area and thereby increase throughput.




It is a further object of the present invention to provide a sheet stager apparatus in which tight control over the flow of the sheet streams is maintained even at the higher level of throughput achieved by the stager apparatus.




It is yet another object of the present invention to provide a high-throughput stager apparatus which also functions to turn the direction of the sheet stream path 90 degrees without causing the individual sheets to be physically rotated.




Some of the objects of the invention having been stated hereinabove, and which are achieved in whole or in part by the present invention, other objects will become evident as the description proceeds when taken in connection with the accompanying drawings as best described hereinbelow.











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a perspective view of a right-angle stager apparatus according to the present invention;





FIG. 2

is a perspective view of the stager apparatus of

FIG. 1

with the main structural framework removed;





FIG. 3

is another perspective view of the stager apparatus of

FIG. 1

, with portions of the main structural framework and some of the sheet-driving components removed;





FIG. 4

is a front elevation view of the stager apparatus of

FIG. 1

with the main structural framework partially cut away to show the staging surfaces;





FIG. 5

is a perspective view of a configuration of nip rollers utilized in the present invention;





FIG. 6

is a side elevation view of a transitional member according to an alternative embodiment of the present invention;





FIGS. 7-13

are schematic diagrams illustrating examples of how sheet streams can be processed in accordance with the present invention.











DETAILED DESCRIPTION OF THE INVENTION




Referring in particular to

FIGS. 1

,


2


and


3


, a right angle stager apparatus according to the present invention is generally designated


10


. Many of the operative components pertinent to the present invention are mounted within a main structural framework


12


of stager apparatus


10


. Stager apparatus


10


includes one or more input channels situated downstream of a cutting mechanism


14


or some other appropriate input feed device. Beginning at a threshold surface


16


, the input channels define separate input paths for cut sheets. In the exemplary embodiment shown in

FIGS. 1-4

, stager apparatus


10


is adapted to process two-up sheets and accordingly includes two input channels: an inside channel generally designated


20


A (as shown only in

FIGS. 2 and 3

) and an outside channel generally designated


20


B (as shown only in FIGS.


2


and


3


). Each input channel


20


A,


20


B includes a transport surface and a staging surface. Accordingly, inside channel


20


A includes an inside transport surface


22


A and an inside staging surface


24


A. Likewise, outside channel


20


B includes an outside transport surface


22


B and an outside staging surface


24


B. The input paths terminate at a staging area defined in part by inside staging surface


24


A and outside staging surface


24


B.




An output channel generally designated


30


(shown in

FIGS. 2 and 3

) provides an output path oriented at a right angle to the input paths. Output channel


30


includes an output surface


32


disposed beneath an upper guide plate


33


and a merger location


34


(as best shown in

FIG. 3

) at which the separate streams of sheets exiting from the staging area merge into a single output stream. Output channel


30


further includes a post-staging surface interposed between each respective staging surface


24


A,


24


B and merger location


34


. Thus,in the exemplary two-up design presently being described, an inside post-staging surface


36


A and an outside post-staging surface


36


B are employed. One or more of post-staging surfaces


36


A,


36


B can be inclined in order to effect a smooth transition from differently elevated staging surfaces


24


A,


24


B to output surface


32


.




Referring specifically to

FIG. 2

, each transport surface


22


A,


22


B includes mechanisms for driving sheets forwardly along their respective input paths. In the preferred embodiment, a constantly rotating drive roller


42


A is disposed below inside transport surface


22


A proximate to a hole or slot


44


A on inside transport surface


22


A. A vertically reciprocative actuator


46


A is disposed directly above drive roller


42


A, and includes a solenoid


48


A and roller bearing


49


A. One or more pairs of input nip rollers


52


A are disposed at the downstream end of inside transport surface


22


A. As shown in

FIG. 5

, each pair of input nip rollers


52


A includes an upper roller


52


A′ disposed generally above inside transport surface


22


A and a lower roller


52


A″ disposed generally below inside transport surface


22


A. In addition, an optical sensor


54


A, preferably of the photocell type, is provided. Optical sensor


54


A is disposed either above inside transport surface


22


A as shown in

FIG. 1

or on inside transport surface


22


A as shown in FIG.


2


. Reed switches or other types of sensors could be substituted for optical sensor


54


A, as is understood by those skilled in the art.




Inside staging surface


24


A can include sheet driving mechanisms similar to those of inside transport surface


22


A. Thus, in the preferred embodiment shown in

FIGS. 1 and 2

, inside staging surface


24


A includes a drive roller


62


A disposed below a hole or slot


64


A of inside staging surface


24


A; an actuator


66


A with a solenoid


68


A and roller bearing


69


A disposed above drive roller


62


A; one or more pairs of take-away nip rollers


72


A; and an optical sensor


54


AA or other type of sensor. Take-away nip rollers


72


A have a configuration analogous to that of input nip rollers


52


A shown in FIG.


5


. Drive roller


62


A, actuator


66


A, and take-away nip rollers


72


A are disposed at a right angle with respect to the sheet driving mechanisms of inside transport surface


22


A. In addition, inside staging surface


24


A includes stop members


70


A defining the terminus of the inside input path.




One or more vertically disposed sheet guides


74


A are disposed above inside staging surface


24


A, as shown in FIG.


1


. Preferably, the operative component of each sheet guide


74


A is a highly flexible, polymeric strip. Sheet guides


74


A constructed of polymeric material are elastic enough to yield in the direction of sheet flow and recover to the original, vertical position after a sheet has passed, yet have enough stiffness to perform the sheet guiding function. Such sheet guides


74


A are therefore believed to be superior to conventional metallic guides, which are prone to plastic (i.e., inelastic and non-recoverable) deformation and frequent replacement.




Outside channel


20


B preferably includes transport components analogous to those used in the design of inside channel


20


A. Accordingly, outside transport surface


22


B includes a drive roller


42


B disposed below outside transport surface


22


B proximate to a hole or slot


44


B on outside transport surface


22


B; a vertically reciprocative actuator


46


B, including a solenoid


48


B and roller bearing


49


B, disposed directly above drive roller


42


B; one or more pairs of input nip rollers


52


B disposed at the downstream end of outside transport surface


22


B; and an optical sensor


54


B or other type of sensor. In addition, outside staging surface


24


B includes a drive roller


62


B disposed below a hole or slot


64


B of outside staging surface


24


B; an actuator


66


B, including a solenoid


68


B and roller bearing


69


B, disposed above drive roller


62


B, one or more pairs of take-away nip rollers


72


B; an optical sensor


54


BB or other type of sensor; stop members


70


B defining the terminus of the outside input path; and vertically disposed, polymeric sheet guides


74


B disposed above outside staging surface


24


B (see FIG.


1


). Input nip rollers


52


B and take-away nip rollers


72


B have a configuration similar to that of input nip rollers


52


A shown in FIG.


5


.




Output channel


30


includes one or more pairs of exit nip rollers


76


which can be of the same general design as input nip rollers


52


A,


52


B and take-away nip rollers


72


A,


72


B. Output channel


30


likewise includes an optical sensor


54


C or other type of sensor. Output channel


30


can have either a left or right hand orientation with respect to input channels


20


A and


20


B. In addition, a second output channel (not shown) can be provided on the side of the staging area opposite to that of output channel


30


. In this manner, one or more of the sheet streams entering the staging area could be caused to turn either left or right upon the appropriate programming of stager apparatus


10


.




The operative driving components of stager apparatus


10


, including drive rollers


42


A,


42


B,


62


A,


62


B and nip rollers


52


A,


52


B,


72


A,


72


B,


76


can be powered by means of conventional transmission and motor devices (not specifically referenced herein). In addition, it is preferable that stager apparatus


10


operate under the control of a computer or other electronic control and monitoring device (not shown). Accordingly, drive rollers


42


A,


42


B,


62


A,


62


B, actuators


46


A,


46


B,


66


A,


66


B and optical sensors


54


A,


54


AA,


54


B,


54


BB,


54


C should all be wired to the electronic device to enable transmission of electronic control and monitoring signals or other data. Optionally, nip rollers


52


A,


52


B,


72


A,


72


B,


76


can also be wired for communication with the electronic control device for monitoring purposes.




Referring to

FIGS. 2 and 4

, in order to improve control over the sheets traveling through the various paths of stager apparatus


10


, it is preferable that each of nip rollers


52


A,


52


B,


72


A,


72


B,


76


be provided as a roller set consisting of two pairs of opposing rollers, and each roller set be employed for each respective surface


22


A,


22


B,


24


A,


24


B,


32


. Moreover, as illustrated in the representative case of input nip rollers


52


A in

FIG. 5

, each of the two pairs of nip rollers


52


A,


52


B,


72


A,


72


B,


76


is preferably connected at their respective lower rollers by a common axle. Thus, in

FIG. 5

, lower rollers


52


A″ are connected through a lower axle


78


. In this manner, each of the two pairs of nip rollers


52


A,


52


B,


72


A,


72


B,


76


rotate at the same speed, thereby imparting equal force to sheets through two points of contact to prevent sheets from twisting or deviating from their proper paths. Finally,

FIG. 4

also shows that upper rollers


52


A′ can optionally be connected through an upper axle


79


. As an alternative, upper axle


79


could serve as the fixed, common axle on which upper rollers


52


A′ are forced to rotate at the same speed.




In order to achieve the high speed at which stager apparatus


10


operates, it is also preferable that many of the surfaces on which the sheets travel be disposed at different elevations with respect to each other. Hence, outside transport surface


22


B can be inclined with respect to inside transport surface


22


A, such that the average or effective elevation of outside transport surface


22


B is different than the elevation of inside transport surface


22


A. In the embodiment shown in

FIGS. 1-4

, outside transport surface


22


B is inclined downwardly and hence effectively lower than inside transport surface


22


A. Additionally, outside staging surface


24


B is disposed at a lower elevation than that of inside staging surface


24


A, such that sheets traveling in different paths are staged at different elevations. In the two-up design exemplified herein and as best shown in

FIG. 4

, this configuration is preferably implemented by transporting the sheets staged on outside staging surface


24


B across extended-length outside post-staging surface


36


B. In this configuration, outside post-staging surface


36


B extends underneath inside staging surface


24


A and inside post-staging surface


36


A.




In addition to utilizing differently elevated input paths, the corresponding transport surfaces


22


A,


22


B and staging surfaces


24


A,


24


B in each input path can be differently elevated. This is implemented through the use of inside and outside transitional members


80


A and


80


B situated at the respective interfaces of corresponding transport surfaces


22


A,


22


B and staging surfaces


24


A,


24


B. In the preferred embodiment, each transitional member


80


A,


80


B has an elongate edge


82


A,


82


B over which sheets travel. Each elongate edge


82


A,


82


B is disposed at a higher elevation than its corresponding staging surface


24


A,


24


B, such that sheets exiting from transport surfaces


22


A,


22


B pass over transitional members


80


A,


80


B and enter respective staging surfaces


24


A,


24


B at a lower elevation. In the embodiment shown in

FIG. 2

, the downstream end of each transport surface


22


A,


22


B is substantially flush with elongate edge


82


A,


82


B of transitional member


80


A,


80


B, and thus transport surface


22


A,


22


B is disposed at a higher elevation than that of associated staging surface


24


A,


24


B.




In an alternative embodiment shown in

FIG. 6

, inside transport surface


22


A could be disposed at the same elevation as inside staging surface


24


A (or could even be disposed at a lower elevation with respect to inside staging surface


24


A), in which case inside transitional member


80


A could include a ramp


84


in order to provide a smooth transition from inside transport surface


22


A to inside staging surface


24


A. Ramp


84


ensures that each sheet exiting inside transitional member


80


A is at a higher elevation than inside staging surface


24


A. Similarly, outside transitional member


80


B could be equipped with ramp


84


in the manner shown in FIG.


6


.




The operation of stager apparatus


10


will now be described with particular reference to FIG.


2


. For clarity, it will be assumed that a roll or contiguous stack of two-up sheet material is to be processed. Accordingly, a two-channel apparatus can be employed, such as stager apparatus


10


in the exemplary configuration described above. It will be understood that the individual sheets cut and formed from the two-up material can constitute printed or graphic pages, and that stager apparatus


10


can handle both portrait and landscape configurations. It will be further understood that at some point upstream of stager apparatus


10


, the two-up material is cut longitudinally to separate it into two separate sheet streams, and is also cut transversely such as by cutting mechanism


14


.




The two sheet streams are advanced to input channels


20


A and


20


B from an upstream location. As the sheet streams pass onto transport surfaces


22


A and


22


B to an appropriate distance, optical sensors


54


A and


54


B will be triggered. If an input feed device such as cutting mechanism is to be employed, the triggering of optical sensors


54


A and


54


B causes the sheet streams to pause, and cutting mechanism


14


is activated to shear the sheet streams and thereby define the respective trailing edges of individual, side-by-side sheets. Based on the input from optical sensors


54


A and


54


B, the electronic control system will send signals to activate actuators


46


A and


46


B, displacing solenoids


48


A and


48


B downwardly. Roller bearings


49


A and


49


B force sheets into contact with drive rollers


42


A and


42


B which causes the sheets to advance to input nip rollers


52


A and


52


B. Input nip rollers


52


A and


52


B drive the sheets over transitional members


80


A and


80


B and into the staging area. As the sheets pass onto their respective staging surfaces


24


A and


24


B, which are disposed along different elevational positions, the sheets will trigger optical sensors


54


AA and


54


BB. Stop members


70


A and


70


B prevent further forward movement of the sheets.




The sheets present on staging surfaces


24


A and


24


B can be held in the staging area for as long a period of time as required by the particular job being performed and by the downstream operations required. Such downstream operations can include accumulating, printing, scanning, folding, envelope inserting and sealing, or any other suitable processing step as can be appreciated by these of skill in the art. Because all of the optical sensors and many of the driving mechanisms are controlled by the electronic controller, the interface between staging apparatus


10


and the various upstream and downstream modules can be synchronized and programmed according to the needs of the user.




At the desired time, one or both of the sheets on staging surfaces


24


A and


24


B are advanced at a right angle with respect to input channels


20


A and


20


B toward post-staging surfaces


36


A and


36


B and eventually output surface


32


of output channel


30


. This is accomplished by activating one or both actuators


66


A,


66


B of staging surfaces


24


A,


24


B in a manner analogous to that of actuators


46


A and


46


B of transport surfaces


22


A and


22


B, and also through the operation of take-away nip rollers


72


A and


72


B. As the sheets exit staging surfaces


24


A and


24


B, sheets from staging surface


24


B pass beneath staging surface


24


A, and the sheets from the two staging surfaces converge into a single output stream at merger location


34


and pass over output surface


32


to downstream processes with the assistance of exit nip rollers


76


. As each sheet passes over output surface


32


, optical sensor


54


C detects its presence and can be used to modify the activation timing of the various driving mechanisms of stager apparatus


10


, as well as the timing of upstream and downstream modules.




In conventional staging devices, each sheet must completely exit its staging surface prior to the introduction of a subsequent sheet onto that staging surface. When constructed in accordance with the present invention, however, stager apparatus


10


permits overlapping of sheets at staging surfaces


24


A and


24


B (i.e., stage overlapping) and/or merger location


34


(i.e., exit overlapping). As a result, a significantly higher throughput is achieved.




Overlapping is accomplished through the use of differently elevated surfaces, and also preferably through the use of the nip rollers configured as described above and illustrated in FIG.


5


. Hence, as a first sheet on staging surface


24


A or


24


B starts to exit therefrom, a subsequent second sheet can start to exit transport surface


22


A or


22


B, pass over higher elevated transitional member


80


A or


80


B and enter into an overlapping relation with the first sheet. Such overlapping does not impair the operation of stager apparatus


10


, and the sheet streams flow from inside channels


20


A and


20


B to outside channel


30


in a rapid, yet controlled, manner. Moreover, the use of differently elevated staging surfaces


24


A and


24


B permits a sheet from one staging surface


24


A or


24


B to overlap with a sheet from another staging surface


24


B or


24


A at the merger location


34


without impairing the operation of stager apparatus


10


.




The desired percentage of overlap among sheets permitted by stager apparatus


10


can be programmed. Moreover, stager apparatus


10


can be programmed to permit 100% overlap of a selected number of sheets on either or both staging surfaces


24


A and


24


B. As a result, stager apparatus


10


can not only perform the combined functions of staging and turning, but also the function of accumulating.





FIGS. 7-13

illustrate some examples of how stager apparatus


10


allows flexibility in the control of sheets as sheets exit the staging area and merger location


34


. Ejection of each sheet from each staging surface


24


A and


24


B is independently controlled by the electronic controller. This flexibility in control allows all material accumulation modes required by downstream devices to be supported. Such material accumulation modes can be dictated by the way the material is programmed (i.e., A to Z versus Z to A, and horizontal programming versus vertical programming) or the ways the individual sheets within the same set (e.g., a four-page document) are accumulated (i.e., over-accumulating versus under-accumulating). As regards horizontal programming, the modes supported include both inside-first and outside-first modes.





FIG. 7

illustrates a control method characterized by A to Z ordering, inside-first programming, and exit gapping. In

FIG. 7

, sheets


1


,


2


,


3


and


4


are initially provided on a length of two-up material and can be part of a 4-page document (i.e., page 1 of 4, page 2 of 4, page 3 of 4, and page 4 of 4) to be processed as a single document and mailed out in a single envelope. Sheet


1


enters inside input channel


20


A towards the staging area in the direction generally indicated by arrow A, and sheet


2


enters outside input channel


20


B in the same direction adjacent to inside input channel


20


A. Sheet


3


subsequently follows sheet


1


as part of the same sheet stream, and sheet


4


likewise follows sheet


2


adjacent to sheet


3


. Sheets


1


-


4


are then conveyed towards output channel


30


in the direction generally indicated by arrow B. If desired, sheets


1


-


4


can be respectively staged in the staging area for predetermined time periods prior to being conveyed towards output channel


30


.




It can be seen that if sheets


1


-


4


enter stager apparatus in a portrait orientation, stager apparatus


10


can turn the respective sheet streams 90 degrees without physically turning sheets


1


-


4


themselves. As a result, sheets


1


-


4


can be merged into a single output stream in a predetermined order and in a landscape orientation. Alternatively, it will be understood that stager apparatus


10


can be configured to receive an input of one or more sheet streams in which sheets are initially in the landscape orientation, such that the sheets will be turned, merged, and then outputted in the portrait orientation.




In the example illustrated by

FIG. 7

, sheet


1


leads sheet


2


and sheet


3


leads sheet


4


in the output stream (hence, inside-first programming is implemented). Moreover, stager apparatus


10


is programmed to process each sheet


1


-


4


with 0% overlap and accordingly to dump each sheet


1


-


4


separately. This control method is thus further characterized by exit gapping.




In order to increase the rate at which stager apparatus


10


processes sheet material, stager apparatus


10


can be programmed to implement exit overlapping in a variety of ways, as illustrated below with reference to

FIGS. 8-13

.





FIG. 8

illustrates a control method characterized by A to Z ordering, inside-first programming, and exit overlapping with under-accumulation. At merger location


34


, sheet


1


is permitted to overlap onto sheet


2


and sheet


3


is subsequently permitted to overlap onto sheet


4


, such that sheet


2


accumulates under sheet


1


and sheet


4


accumulates under sheet


3


. Still, sheet


1


leads sheet


2


and sheet


3


leads sheet


4


in the output stream.





FIG. 9

illustrates a control method characterized by A to Z ordering, inside-first programming, and exit overlapping with over-accumulation. At merger location


34


, sheet


3


is permitted to overlap onto sheet


2


.





FIG. 10

illustrates a control method characterized by Z to A ordering, inside-first programming, and exit overlapping with under-accumulation. Sheet


4


is permitted to overlap onto sheet


3


and sheet


2


is subsequently permitted to overlap onto sheet


1


, such that sheet


3


accumulates under sheet


4


and sheet


1


accumulates under sheet


2


. Sheet


4


leads sheet


3


and sheet


2


leads sheet


1


in the output stream.





FIG. 11

illustrates a control method characterized by Z to A ordering, inside-first programming, and exit overlapping with over-accumulation. At merger location


34


, sheet


2


is permitted to overlap onto sheet


3


.





FIG. 12

illustrates a control method characterized by Z to A ordering, outside-first programming, and exit overlapping with over-accumulation. Sheet


4


leads sheet


3


and sheet


2


leads sheet


1


in the output stream. At merger location


34


, sheet


3


is permitted to overlap onto sheet


4


and sheet


1


is permitted to overlap onto sheet


2


.





FIG. 13

illustrates a control method characterized by A to Z ordering, vertical programming, and 100% stager overlapping with over-accumulation. In this example, inside input channel


20


A and outside input channel


20


B process entirely independent sets of sheets. For example, sheets


1


.


1


and


1


.


2


could comprise a first document to be mailed to a first recipient while sheets


2


.


1


and


2


.


2


could comprise a different, second document to be mailed to a second recipient. Sheets


1


.


1


and


1


.


2


exit merger location


34


first, with sheet


1


.


2


100% overlapped with sheet


1


.


1


. Subsequently, sheet


2


.


2


is 100% overlapped with sheet


2


.


1


.




It will be understood that stager apparatus


10


can be programmed to cause both stage overlapping and exit overlapping in order to further increase the rate at which stager apparatus


10


processes sheet material.




It will also be understood that the present invention is not limited to the processing of two-up material as described by way of example hereinabove. On the contrary, the present invention is equally applicable to operations involving more than two input paths and their associated sheet streams, as well as a single input path and sheet stream. Such other applications fall within the scope of the present invention and accompanying claims. It will be further understood that various details of the invention may be changed without departing from the scope of the invention. Furthermore, the foregoing description is for the purpose of illustration only, and not for the purpose of limitation —the invention being defined by the claims.



Claims
  • 1. A document handling apparatus comprising:(a) an input path structure including an input surface and a first document moving device disposed in operative engagement with the input surface; (b) an output path structure oriented perpendicularly with respect to the input path structure and including an output surface; (c) a staging and document turning assembly interposed between the input path structure and the output path structure and including a staging surface and a second document moving device, wherein the staging surface defines an interface between the input surface and the output surface, and the second document moving device is disposed in operative engagement with the staging surface and is oriented perpendicularly with respect to the first document moving device; and (d) means for driving a first sheet staged on the staging surface toward the output surface after a second sheet being fed onto the staging surface from the input surface has moved into an overlapping relation with the first sheet.
  • 2. The apparatus according to claim 1 wherein the first document moving device comprises a first roller disposed below a first opening of the input surface and a first actuator disposed above the first opening, and the second document moving device comprises a second roller disposed below a second opening of the staging surface and a second actuator disposed above the second opening.
  • 3. The apparatus according to claim 1 comprising a transitional surface interposed between the input surface and the staging surface and disposed at an elevation greater than an elevation of the staging surface.
  • 4. The apparatus according to claim 1 comprising a transitional surface interposed between the input surface and the staging surface and disposed at an elevation greater than an elevation of the input surface.
  • 5. The apparatus according to claim 1 wherein the input surface has an average elevation different from the elevation of the staging surface.
  • 6. A document handling apparatus comprising:(a) an input path structure comprising a plurality of input surfaces and a plurality of document input devices respectively disposed in operative engagement with the input surfaces; (b) an output path structure oriented perpendiculary with respect to the input path structure and including an output surface; and (c) a staging and document turning assembly interposed between the input path structure and the output path structure, the staging and document turning assembly comprising a plurality of staging surfaces and a plurality of document output devices, wherein each staging surface defines an interface between a respective input surface and the output surface and is disposed in a stepped relation to the other staging surfaces, and each document output device is disposed in operative engagement with a respective staging surface and is oriented perpendicularly with respect to the document input devices.
  • 7. The apparatus according to claim 6 wherein the input path structure defines a plurality of document input paths, the output path structure defines a document output path, and the document input paths converge into the document output path at a merger location.
  • 8. The apparatus according to claim 7 comprising means for driving a first sheet received at the merger location from a first one of the staging surfaces along the output surface after a second sheet received from a second one of the staging surfaces has moved into an overlapping relation with the first sheet.
  • 9. The apparatus according to claim 6 wherein at least one of the staging surfaces is disposed at an elevation different from an elevation of at least one of the other staging surfaces.
  • 10. The apparatus according to claim 6 wherein at least on of the input surfaces has an average elevation different from an average elevation of at least one of the other input surfaces.
  • 11. The apparatus according to claim 6 wherein at least one of the input surfaces has an average elevation different from an elevation of its corresponding staging surface.
  • 12. The apparatus according to claim 6 comprising a plurality of transitional members, each transitional member interposed between a respective input surface and staging surface, wherein at least one of the transitional members includes an upper surface disposed at an elevation greater than an elevation of its respective staging surface.
  • 13. The apparatus according to claim 12 wherein at least one of the staging surfaces is disposed at an elevation different from an elevation of at least one of the other staging surfaces.
  • 14. The apparatus according to claim 6 comprising means for driving a first sheet staged on one of the staging surfaces toward the output surface after a second sheet being fed onto the staging surface from its corresponding input surface has moved into an overlapping relation with the first sheet.
  • 15. A document handling apparatus comprising:(a) an input path structure including an input surface and a first document moving device disposed in operative engagement with the input surface, wherein the first document moving device comprises a first roller disposed below a first opening of the input surface and a first actuator disposed above the first opening; (b) an output path structure oriented perpendicularly with respect to the input path structure and including an output surface; and (d) a staging and document turning assembly interposed between the input path structure and the output path structure and including a staging surface and a second document moving device, the staging surface defining an interface between the input surface and the output surface, wherein the second document moving device is disposed in operative engagement with the staging surface and is oriented perpendicularly with respect to the first document moving device, and the second document moving device comprises a second roller disposed below a second opening of the staging surface and a second actuator disposed above the second opening.
  • 16. The apparatus according to claim 5 comprising means for driving a first sheet staged on the staging surface toward the output surface after a second sheet being fed onto the staging surface from the input surface has moved into an overlapping relation with the first sheet.
  • 17. A document handling apparatus comprising:(a) an input path structure comprising a plurality of document input paths, the input paths respectively comprising a plurality of input surfaces and a plurality of document input devices, each input device disposed in operative engagement with at least one of the input surfaces; (b) an output path structure oriented generally perpendicularly with respect to the input path structure and comprising a document output path, the document output path comprising an output surface, wherein the document input paths converge into the document output path at a merger location; (c) a staging and document turning assembly interposed between the input path structure and the output path structure, the staging and document turning assembly comprising a plurality of staging surfaces and a plurality of document output devices, wherein each staging surface defines an interface between a respective input surface and the output surface, and each document output device is disposed in operative engagement with a respective staging surface and is oriented perpendicularly with respect to the document input devices; and (d) means for driving a first sheet received at the merger location from a first one of the staging surfaces along the output surface after a second sheet received from a second one of the staging surfaces has moved into an overlapping relation with the first sheet.
  • 18. The apparatus according to claim 17 wherein each staging surface is disposed in a stepped relation to the other staging surfaces.
  • 19. A document handling apparatus comprising:(a) an input path structure comprising a plurality of input surfaces and a plurality of document input devices respectively disposed in operative engagement with the input surfaces; (b) an output path structure oriented perpendicularly with respect to the input path structure and including an output surface; and (c) a staging and document turning assembly interposed between the input path structure and the output path structure, the staging and document turning assembly comprising a plurality of staging surfaces and a plurality of document output devices, wherein each staging surface defines an interface between a respective input surface and the output surface, each document output device is disposed in operative engagement with a respective staging surface and is oriented perpendicularly with respect to the document input devices, and at least one of the staging surfaces is disposed at an elevation different from an elevation of at least one of the other staging surfaces.
  • 20. The apparatus according to claim 19 wherein each staging surface is disposed in a stepped relation to the other staging surfaces.
  • 21. A document handling apparatus comprising:(a) an input path structure comprising a plurality of input surfaces and a plurality of document input devices respectively disposed in operative engagement with the input surfaces; (b) an output path structure oriented perpendicularly with respect to the input path structure and including an output surface; (c) a staging and document turning assembly interposed between the input path structure and the output path structure, the staging and document turning assembly comprising a plurality of staging surfaces and a plurality of document output devices, wherein each staging surface defines an interface between a respective input surface and the output surface, and each document output device is disposed in operative engagement with a respective staging surface and is oriented perpendicularly with respect to the document input devices; and (d) means for driving a first sheet staged on one of the staging surfaces toward the output surface after a second sheet being fed onto the staging surface from its corresponding input surface has moved into an overlapping relation with the first sheet.
  • 22. The apparatus according to claim 21 wherein each staging surface is disposed in a stepped relation to the other staging surfaces.
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of co-pending U.S. patent application Ser. No. 09/568,876 filed May 9, 2000, now U.S. Pat. No. 6,378,861 the contents of which are incorporated herein by reference, which claims priority to U.S. Provisional Application Serial No. 60/166,434 filed Nov. 19, 1999 and further claims priority to U.S. Provisional Application Serial No. 60/167,052 filed Nov. 22, 1999.

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Provisional Applications (2)
Number Date Country
60/167052 Nov 1999 US
60/166434 Nov 1999 US