Patent Publication Number: US-8985576-B1

Title: Segmented scuffer disk(s) for improved registration of print media sheets

Description:
BACKGROUND 
     The systems and methods disclosed herein generally relate to registration of print media sheets in a stack and, more particularly, to concurrent leading edge registration and side edge registration of print media sheets in a stack through the use of rotating segmented scuffer disk(s) and side tamper(s), respectively. 
     More particularly, printing systems often incorporate a sheet registration system. Specifically, a sheet registration system typically receives a stream of print media sheets. As each print media sheet is received, it is guided onto the top of a stack of print media sheets on a stacking tray (e.g., on an elevator deck) and an articulated scuffer belt engages the leading edge of the top print media sheet in the stack. The articulated scuffer belt rotates, thereby forcing the top print media sheet against a leading edge registration guide. The articulated scuffer belt then lifts up and away from the top print media sheet and side tamper(s) tamp the stack in order to register side edge(s) of the print media sheets in the stack in the cross-process direction. However, when the articulated scuffer belt lifts up, the top print media sheet can slip (i.e., migrate backwards) away from the leading edge registration guide, particularly, if the stacking tray is not level (i.e., if the leading edge of the print media sheets in the stack are higher than the trailing edge). 
     SUMMARY 
     In view of the foregoing, disclosed herein are systems that allow for concurrent leading edge registration and side edge registration of print media sheet(s). Specifically, in these systems, one or more segmented scuffer disks are mounted to an axle above a tray. The segmented scuffer disk(s) can each comprise multiple segments and, as the axle rotates, these segments can engage a print media sheet in the tray (e.g., the top print media sheet on a stack in the tray) and can continuously force that print media sheet in a first direction against a leading edge registration guide. The segments of the scuffer disk can also be independently flexible in a second direction perpendicular to the first direction. This independent flexibility allows tamper(s) on the side of the tray to perform a tamping process in the second direction at the same time as the print media sheet is forced in the first direction, thereby avoiding any slippage of the print media sheet away from the leading edge registration guide. Also disclosed herein are associated methods. 
     More particularly, disclosed herein is a sheet registration system that allows for concurrent leading edge registration and side edge registration of a print media sheet. This system can comprise a tray that receives a print media sheet. The system can further comprise a leading edge registration guide at one end of the tray and an axle above the tray adjacent to the same end. This axle can be parallel to the leading edge registration guide and can rotate continuously. 
     The system can further comprise one or more segmented scuffer disks mounted to the axle. Each scuffer disk can comprise multiple segments that extend radially from the axle and that are perpendicular to the leading edge registration guide. These segments can engage the print media sheet, as the axle rotates, and, thereby can continuously force that print media sheet in a first direction (i.e., a process direction) towards the leading edge registration guide. That is, the scuffer disk(s) and, particularly, the multiple segments thereof can provide for continuous leading edge registration of the print media sheet. It should be noted, however, that the multiple segments of each scuffer disk can also be independently flexible in a second direction (i.e., a cross-process direction), which is perpendicular to the first direction. 
     This system can further comprise a tamper positioned laterally adjacent to a side of the tray. While the axle is rotating and the segments of the scuffer disk(s) are engaging the print media sheet, the tamper can concurrently tamp the print media sheet in the second direction. Since the segments of the scuffer disk(s) are independently flexible in the second direction, the print media sheet can move in the second direction during this tamping process without buckling as it is forced by the scuffer disk(s) and, particularly, the multiple segments thereof in the first direction for leading edge registration. 
     Also disclosed herein is a sheet registration system that allows for concurrent leading edge registration and side edge registration of print media sheets in a stack. This system can comprise a tray that receives a stream of print media sheets such that a stack is formed on the tray. The system can further comprise a leading edge registration guide at one end of the tray and an axle above the tray adjacent to the same end. This axle can be parallel to the leading edge registration guide and can rotate continuously as the stream of print media sheets is received. This axle can further be moveably mounted above the tray, as discussed in greater detail below. 
     The system can further comprise one or more segmented scuffer disks mounted to the axle. Each scuffer disk can comprise multiple segments that extend radially from the axle and that are perpendicular to the leading edge registration guide. These segments can engage the top print media sheet on the stack, as the axle rotates, and, thereby can continuously force that top print media sheet in a first direction towards the leading edge registration guide. That is, the scuffer disk(s) and, particularly, the multiple segments thereof can provide for continuous leading edge registration of the top print media sheet in the stack. It should be noted, however, that the multiple segments of each scuffer disk can also be independently flexible in a second direction (i.e., a cross-process direction), which is perpendicular to the first direction. Additionally, as mentioned above the axle can be moveably mounted above the tray. Specifically, this axle can be mounted above the tray and can be automatically moveable relative to the stack such that, as the print media sheets are added to the stack and a height of the stack increases, the distance between the stack and the axle remains essentially constant and, thus, the force applied by the disk to the top print media sheet also remains essentially constant. 
     This system can further comprise a tamper positioned laterally adjacent to a side of the tray. While the axle is rotating above the stack and the segments of the scuffer disk(s) are engaging the top print media sheet, the tamper can concurrently tamp the stack of print media sheets in the second direction. Since the segments of the scuffer disk(s) are independently flexible in the second direction, the top print media sheet can move in the second direction during this tamping without buckling as it is concurrently forced by the scuffer disk(s) and, particularly, the multiple segments thereof in the first direction for leading edge registration. 
     Also disclosed herein is a sheet registration method that allows for concurrent leading edge registration and side edge registration of a print media sheet. Specifically, this method can comprise receiving, onto a tray, a print media sheet. The method can further comprise using one or more segmented scuffer disk(s) mounted to an axle rotating above the tray to engage the print media sheet and continuously force the print media sheet in a first direction (i.e., in a process direction) towards a leading edge registration guide at one end of the tray. Then, as the print media sheet is engaged by the segmented scuffer disk(s), a tamper positioned laterally adjacent to a side of the tray can be used to tamp the print media sheet in a second direction (i.e., a cross-process direction), which is perpendicular to the first direction. It should be noted that the segmented scuffer disk(s) can each comprise multiple segments and these multiple segments can each be independently flexible in the second direction, thereby allowing for movement of the print media sheet in that second direction during the tamping process without buckling as it is concurrently forced in the first direction for leading edge registration. 
     Also disclosed herein is a sheet registration method that provides for concurrent leading edge registration and side edge registration of print media sheets in a stack. Specifically, this method can comprise receiving, onto a tray, a stream of print media sheets such that a stack of the print media sheets forms on the tray. The method can further comprise using one or more segmented scuffer disk(s) mounted to an axle rotating above the tray to engage the top print media sheet on the stack and continuously force that top print media sheet in a first direction (i.e., a process direction) towards a leading edge registration guide at one end of the tray. Additionally, as the top print media sheet is engaged by the segmented scuffer disk(s), a tamper positioned laterally adjacent to a side of the tray can be used to tamp the stack in a second direction (i.e., a cross-process direction), which is perpendicular to the first direction. It should be noted that the segmented scuffer disk(s) can comprise multiple segments and these multiple segments can each be independently flexible in the second direction, thereby allowing for movement of the stack of print media sheets in that second direction during the tamping process without buckling as the top print media sheet is concurrently forced in the first direction for leading edge registration. The method can further comprise automatically moving the axle relative to the stack such that, as the print media sheets are added to the stack and a height of the stack increases, a distance between the stack and the axle remains constant and, thus, the force applied by the segmented scuffer disk(s) to the top print media sheet also remains constant. 
     These and other features are described in, or are apparent from, the following detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosed systems and method will be better understood from the following detailed description with reference to the attached figures, which are not necessarily drawn to scale and in which: 
         FIG. 1  is a cross-section illustration of a sheet registration system through a plane parallel with the process direction; 
         FIG. 2  is a top view illustration of the sheet registration system of  FIG. 1 ; 
         FIG. 3  is a cross-section illustration of the sheet registration system of  FIG. 1  through a plane perpendicular to the process direction at one point in time during operation; 
         FIG. 4  is a cross-section illustration of the sheet registration system of  FIG. 1  through a plane perpendicular to the process direction at another point in time during operation; 
         FIG. 5  is a cross-section illustration of the sheet registration system of  FIG. 1  through a plane perpendicular to the process direction at yet another point in time during operation; 
         FIG. 6  is a flow diagram illustrating a sheet registration method; 
         FIG. 7  is a schematic diagram illustrating a multi-function device that can be used in conjunction with the systems and methods disclosed herein; and 
         FIG. 8  is a schematic diagram illustrating multiple multi-function devices as shown in  FIG. 7  connected via a network. 
     
    
    
     DETAILED DESCRIPTION 
     As mentioned above, printing systems often incorporate a sheet registration system. Specifically, a sheet registration system typically receives a stream of print media sheets. As each print media sheet is received, it is guided onto the top of a stack of print media sheets on a stacking tray (e.g., on an elevator deck) and an articulated scuffer belt engages the leading edge of the top print media sheet in the stack. The articulated scuffer belt rotates, thereby forcing the top print media sheet against the leading edge registration guide. The articulated scuffer belt then lifts up and away from the top print media sheet and side tamper(s) tamp the stack in order to register side edge(s) of the print media sheets in the stack in the cross-process direction. However, when the articulated scuffer belt lifts up, the top print media sheet can slip (i.e., migrate backwards) away from the leading edge registration guide, particularly, if the stacking tray is not level (i.e., if the leading edge of the print media sheets in the stack are higher than the trailing edge). 
     In view of the foregoing, disclosed herein are systems that allow for concurrent leading edge registration and side edge registration of print media sheet(s). Specifically, in these systems, one or more segmented scuffer disks are mounted to an axle above a tray. The segmented scuffer disk(s) can each comprise multiple segments and, as the axle rotates, these segments can engage a print media sheet in the tray (e.g., the top print media sheet on a stack in the tray) and can continuously force that print media sheet in a first direction (i.e., in a process direction) against a leading edge registration guide. The segments of the scuffer disk can also be independently flexible in a second direction (i.e., a cross-process direction), which is perpendicular to the first direction. This independent flexibility allows tamper(s) on the side of the tray to perform a tamping process in the second direction at the same time as the print media sheet is forced in the first direction, thereby avoiding any slippage of the print media sheet away from the leading edge registration guide. Also disclosed herein are associated methods. 
     More particularly,  FIGS. 1 and 2  are cross-section and top view illustrations, respectively, of a sheet registration system  100  that allows for concurrent leading edge registration and side edge registration of a print media sheet and, particularly, that allows for concurrent leading edge registration and side edge registration of print media sheets as such sheets are compiled in a stack. 
     Referring to  FIGS. 1 and 2  in combination, this system  100  can comprise a tray  101  (e.g., a sheet stacking tray, such as an elevator deck). The tray  101  can comprise a base  102 , a first end  103 , a second end  104  opposite the first end  103  and opposing sides (i.e., a first side  106  and a second side  107  opposite the first side  106 ). The tray  101  can receive a print media sheet  110  and, more particularly, can receive a stream of print media sheets (e.g., from an input at the first end  103  of the tray  101 ). As the print media sheets are received by the tray  101 , they can be guided (e.g., by vacuum transportation, by nips and/or by any other suitable means (not shown)) such that a stack  111  of print media sheets is formed on the base  102  of the tray  101  and such that, as each print media sheet enters the tray  101 , it becomes the top print media sheet  110  on the stack  111 . The top print media sheet  110  as well as each of the other print media sheets in the stack can have a leading edge  112  and a trailing edge  113  opposite the leading edge  112 . 
     The system  100  can further comprise a leading edge registration guide  120  at the second end  104  of the tray  101 . This leading edge registration guide  120  can comprise a fixed, non-flexible, vertical surface, which is essentially parallel to the leading edges  112  of the print media sheets in the stack  111  and which extends upward from the base  102 . 
     The system  100  can further comprise an axle  130  mounted above the tray  101  at the second end  104  such that it is parallel to the leading edge registration guide  120 . This system  100  can further comprise a motor  135 , which is operably connected to the axle  130  and which causes (i.e., which is adapted to cause, which is configured to cause, etc.) the axle  130  to rotate continuously in a specific rotation direction  131  as the stream of print media sheets is received and formed in the stack  111  on the base  102  of the tray  101 . This axle  130  can further be moveably mounted above the tray  101  (e.g., by an elevator mechanism or other suitable mechanism) so that the positioned of the axle  130  relative to the stack  111  can be automatically adjusted, as discussed in greater detail below. 
     The system  100  can further comprise one or more segmented scuffer disks  140  (e.g., see segmented scuffer disks  140   a  and  140   b  in  FIG. 2 ) mounted to the axle  130 . Each segmented scuffer disk  140  can comprise multiple segments  141   a - d  that extend radially from the axle  130  and that are perpendicular to the leading edge registration guide  120 . 
     The segments  141   a - d  of each of the scuffer disk(s)  140  can be essentially wedge-shaped (also referred to herein as petal-shaped) and each wedge-shaped segment can be positioned between and immediately adjacent to two other wedge-shaped segments such that, in combination, they form an essentially circular disk. The segments  141   a - d  can be discrete segments that are attached at the axle  130 , thereby forming the essentially circular disk. Alternatively, the segments  141   a - d  can be cut portions of an essentially circular disk. Optionally, the leading side  142  of each segment  141   a - d  (i.e., the first side of the segment  141   a - d  to contact a print media sheet in the specific rotation direction  131  of the axle  130 ) and, particularly, the corner of that leading side  142  can be rounded (i.e., curved or scalloped in shape) and the trailing side  143  can be angled. For purposes of illustration,  FIG. 1  shows a scuffer disk  140  with four segments  141   a - d . However, it should be understood that, alternatively, any number of three or more segments could be used. 
     In any case, the segments  141   a - d  of the scuffer disk(s)  140  can engage the top print media sheet  110  on the stack  111 , as the axle  130  continuously rotates and, thereby can continuously force that top print media sheet  110  in a first direction  121  and, particularly, in a process direction towards the leading edge registration guide  120 . That is, the scuffer disk(s)  140  and, particularly, the multiple segments  141   a - d  thereof can provide for continuous leading edge registration of the top print media sheet  110  in the stack  111 , as each new print media sheet to the stack  111  becomes the top print media sheet  110 . The scuffer disk(s)  140  can each have a diameter that is at least equal to 1/10 the length of the print media sheets in the stack  111  in order to provide a sufficient force to move the top print media sheet  110  in the first direction  121 . Thus, for example, for a paper print media sheet having a length of 10-15 inches, the diameter of the scuffer disk(s)  140  can be 1-5 inches or greater (e.g., 2.3 inches). 
     For purposes of illustration,  FIG. 2  shows two segmented scuffer disks mounted to the axle  130  and, particularly, a first scuffer disk  140   a  mounted adjacent to the first side  106  of the tray  101  and the second scuffer disk  140   b  mounted adjacent to the second side  107  of the tray  101 . However, it should be understood that any number of one or more scuffer disks  140  could be incorporated into the disclosed system  100  and the number should be predetermined so that the force applied by the scuffer disk(s) to the top print media sheet  110  is sufficient to move the top print media sheet in the first direction  121  against the leading edge registration guide. Placement of the scuffer disk(s)  140  along the axle  130  should also be predetermined to ensure uniform movement. For example, if a single scuffer disk is used, it should be placed so that it is positioned along the center line of the stack  111 ; whereas if two scuffer disks are used (e.g., as shown in  FIG. 2 ), they should be positioned symmetrically on opposite sides of the stack  111 ; and so on. 
     As mentioned above, the motor  135  causes the axle  130  to rotate continuously in the specific rotation direction  131 . The speed at which the motor  135  drives the axle and, thereby drives the scuffer disk(s) can be set to a constant speed and this constant speed can be predetermined to ensure that the tangential speed of the outer surface of the scuffer disk(s)  140  is some small percentage (e.g., 1-3%) higher than the speed of the print media sheet (e.g., from a vacuum or other transport mechanism). 
     This system  100  can further comprise a tamping mechanism comprising one or more tampers  151 - 152  positioned laterally adjacent to the opposing sides  106 , 107  of the tray  101 , respectively. While the axle  130  is rotating above the stack  111  and the segments  141   a - d  of the scuffer disk(s)  140  are engaging the top print media sheet  110 , the tampers  151 - 152  can concurrently tamp the stack  111  of print media sheets in the second direction  122  (i.e., in the cross-process direction) for side edge registration. Tamping mechanisms are well known in the art and, thus, the details are omitted from this specification in order to allow the reader to focus on the salient aspects of the disclosed system. 
     In any case, since, as discussed above, the segments  141   a - d  of the scuffer disk(s)  140  are independently flexible in the second direction  122  (i.e., in the cross-process direction), the top print media sheet  110  can move in the second direction  122  for side edge registration during the tamping process without buckling even when that same top print media sheet  110  is simultaneously being forced by the scuffer disk(s)  140  and, particularly, the multiple segments  141   a - d  thereof in the first direction  121  for leading edge registration. More specifically,  FIG. 3  is a cross-section of the system  100  through a plane in the second direction  122  (i.e., in the cross-process direction) at a point in time when the segments  141   c  of each of the scuffer disk  140   a  and  140   b  have engaged the top print media sheet  110 , but prior to the tampers  151 - 152  tamping the stack  111 . Thus, the top print media sheet  110  is shown as offset from the stack  111  in the second direction  122  and those segments  141   c  of each of the scuffer disks  140   a - 140   b  that are below the axle  130  are essentially perpendicular to and in direct contact with the top print media sheet  110 .  FIG. 4  is a cross-section of the system  100  through the same plane in the second direction  122  (i.e., in the cross-process direction) at a point in time when the segments  141   c  of each of the scuffer disks  140   a  and  140   b  have engaged the top print media sheet  110  and the tampers  151 - 152  have tamped the stack  111 , causing the top print media sheet  110  to move in the second direction  122 . In this case, the top print media sheet  110  is shown as being aligned with the stack  111  and those segments  141   c  that are below the axle  130  are shown as being flexed (i.e., in a flexed or deflected position), but still in direct contact with the top print media sheet  110 . 
     Those skilled in the art will recognize that each segment that engages the top print media sheet  110  and moves into a flexed position as a function of a tamping process will effectively function as a column (i.e., a beam, pillar, etc.), which is clamped at the upper end attached to the axle  130  and free at the lower end adjacent to the top print media sheet  110 , as shown in  FIG. 4 . Furthermore, since the segments  141   a - d  of each of the scuffer disks  140   a - 140   b  are all independently flexible, as the axle  130  continues to rotate, the segments  141   c  of the scuffer disks  140   a - 140   b  that were in the flexed position following the tamping process, as shown in  FIG. 4 , will return to an unflexed position (i.e., an undeflected position) as they lift away from the top print media sheet  110  (i.e., they will reset to their natural position) and the next segments  141   d  that engage the top print media sheet  110  will also be in an unflexed position, as shown in  FIG. 5 , until the tamping is performed. 
     It should be noted that, as mentioned above, the leading side  142  of each segment  141   a - d  and, particularly, the corner of that leading side  142  can, optionally, be rounded (i.e., curved or scalloped in shape). This rounded shape can ensure a smooth transition during rotation of the axle  130  as one segment and, particularly, a flexed segment lifts away from the top print media sheet  110  and the next segment and, particularly, an unflexed segment engages the top print media sheet  110 . This is because the point of impact between the unflexed segment and the print media sheet is rounded as opposed to a small point and also because the distance to the center from that rounded edge at that rounded edge is relatively short as compared to the full column length for the segment. 
     Referring again to  FIGS. 3-5 , as mentioned above, the axle  130  can be mounted such that it is positioned above the tray  101  and parallel to the leading edge registration guide  120 . More specifically, an elevator mechanism  137  or other suitable lifting mechanism can be operatively connected the axle  130 . This elevator mechanism  137  can be configured so as to position the axle  130  above the tray  101  and can further be configured so as to automatically move the axle  130  relative to the stack  111  of print media sheets on the tray  101  such that, as new print media sheets are added to the stack  111  and the height of the stack  111  increases (e.g., as sensed by a sensor in communication with the elevator mechanism  137 ), the distance  136  between the top print media sheet  110  in the stack  111  and the axle  130  remains essentially constant and equal to slightly less than the radius of the disk (i.e., the length of a single segment  141   a - d ) such that the force applied by the scuffer disk(s)  140   a - b  to the top print media sheet  110  also remains essentially constant. Thus, the scuffer disk(s)  140   a - b  will remain in continuous contact with the top print media sheet  110  or, more particularly, at least one of the segments  141   a - d  of each of the scuffer disks  140   a - b  will always be in contact with the top print media sheet  110  in the stack  111  in order to provide for continuous leading edge registration, even during tamping, without causing the top print media sheet  110  to buckle. 
     It should be noted that the scuffing properties can be tailored so that the force required to flex any segment  141   a - d  of a scuffer disk  140  will be less than the force required to buckle the thinnest print media sheet that the system  100  would be expected to encounter. 
     Referring to the flow diagram of  FIG. 6  in combination with  FIGS. 1-5  described above, also disclosed herein is a sheet registration method that allows for concurrent leading edge registration and side edge registration of a print media sheet and, more particularly, that allows for concurrent leading edge registration and side edge registration of a top print media sheet on a stack of print media sheets. This method can comprise providing a sheet registration system, such as the sheet registration system  100 , comprising a tray  101  and, particularly, a sheet stacking tray, such as an elevator deck ( 602 ). 
     Next, a print media sheet  110  and, more particularly, a stream of print media sheets can be received by a tray  101  in the sheet registration system  100  (e.g., from an input at a first end  103  of the tray  101 ) ( 604 ). As the print media sheets are received by the tray  101 , they can be guided (e.g., by vacuum transportation, by nips and/or by any other suitable means (not shown)) such that a stack  111  of print media sheets is formed on a base  102  of the tray  101  and such that, as each print media sheet enters the tray  101 , it becomes the top print media sheet  110  on the stack  111 . 
     Additionally, as the print media sheets are received by the tray  101  and a stack  111  is formed, one or more segmented scuffer disk(s)  140 , which are mounted to a continuously rotating axle  130  above the tray  101  and which have multiple segments  141   a - d , can be used to engage the top print media sheet  110  on the stack  111  and continuously force that top print media sheet  110  in a first direction  121  and, particularly, in a process direction towards a leading edge registration guide  120  ( 606 ). 
     The method can further comprise, during the process  606  of using the segmented scuffer disk(s)  140 , also using tampers  151 - 152  positioned laterally adjacent to the opposing sides  106 ,  107  of the tray  101 , respectively, to concurrently tamp the stack  111  of print media sheets in the second direction  122  (i.e., in the cross-process direction) for side edge registration ( 608 ). In this case, since, as discussed above, the segments  141   a - d  of the scuffer disk(s)  140  are independently flexible in the second direction  122 , the top print media sheet  110  can move in the second direction  122  for side edge registration during the tamping process  608  without buckling even when that same top print media sheet  110  is simultaneously being forced at process  606  by the scuffer disk(s)  140  and, particularly, by the multiple segments  141   a - d  thereof in the first direction  121  for leading edge registration. The processes  606  and  608  of using of the segmented scuffer disk(s)  140  and using of the tampers  151 - 152  can be performed concurrently so that the top print media sheet  110  remains registered against the leading edge registration guide  120  (i.e., so that it does not slip or migrate away from the leading edge registration guide  120 ) even as tamping is being performed. 
     Finally, the method can comprise automatically moving the axle  130  relative to the top print media sheet  110  in the stack  111  such that, as new print media sheets are added to the stack  111  and the height of the stack  111  increases, the distance  136  between the top print media sheet  110  on the stack  111  and the axle  130  remains constant and, thus, the force applied by the scuffer disk(s)  140  to the top print media sheet  110  also remains essentially constant ( 610 ). 
       FIG. 7  illustrates a multi-function device  704  that can be used with the systems and methods disclosed herein and that can comprise, for example, a printer, copier, multi-function machine, etc. The multi-function device  704  includes a controller/processor  710  and a communications port (input/output)  716  operatively connected to the controller/processor  710  and to a network  802  external to the multi-function device  704 , as shown in  FIG. 8 . In addition, the multi-function device  704  can include at least one accessory functional component such as a graphic user interface (GUI) assembly  722  that operates on the power supplied from the AC power source  728 , which may be external to the multi-function device  704 . The AC power source  728  may provide electrical power through the power supply  734 . 
     The controller/processor  710  controls the various actions of the multi-function device  704 . A non-transitory computer storage medium device  740  (which can be optical, magnetic, capacitor based, etc.) is readable by the controller/processor  710  and stores instructions that the controller/processor  710  executes to allow the multi-function device  704  to perform its various functions, such as those described herein. Thus, as shown in  FIG. 7 , a device housing  746  has one or more functional components that operate on power supplied from the AC power source  728  by the power supply  734 . The power supply  734  can comprise a power storage element (e.g., a battery) and connects to the AC power source  728 , which may be external to the multi-function device  704 . The power supply  734  converts the external power into the type of power needed by the various components. 
     The multi-function device  704  includes at least one marking device (printing engines)  752  operatively connected to the controller/processor  710 , a media path  758  positioned to supply sheets of media from a sheet supply  764  to the marking device(s)  752 , etc. After receiving various markings from the printing engine(s), the sheets of media can optionally pass to a finisher  770  which can fold, staple, sort, etc., the various printed sheets. In addition, the multi-function device  704  can include at least one accessory functional component (such as a scanner/document handler  776 , etc.) that also operates on the power supplied from the AC power source  728  (through the power supply  734 ). 
     As would be understood by those ordinarily skilled in the art, the multi-function device  704  shown in  FIG. 7  is only one example and the devices and methods herein are equally applicable to other types of printing devices that may include fewer components or more components. For example, while a limited number of printing engines and paper paths are illustrated in  FIG. 7 , those ordinarily skilled in the art would understand that many more paper paths and additional printing engines could be included within any printing device used with devices and methods herein. 
     As shown in  FIG. 8 , exemplary printers, copiers, multi-function machines, and multi-function devices (MFD)  704  may be located at various different physical locations  806 . Other devices according to devices and methods herein may include various computerized devices  808 . The computerized devices  808  can include print servers, printing devices, personal computers, etc., and are in communication (operatively connected to one another) by way of a network  802 . The network  802  may be any type of network, including a local area network (LAN), a wide area network (WAN), or a global computer network, such as the Internet. 
     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 various devices and methods. It will be understood that each block of the flowchart illustrations and/or two-dimensional block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. The computer 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. 
     According to a further device and method herein, an article of manufacture is provided that includes a tangible computer readable medium having computer readable instructions embodied therein for performing the steps of the computer implemented methods, including, but not limited to, the method illustrated in  FIG. 7 . Any combination of one or more computer readable non-transitory medium(s) may be utilized. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The non-transitory computer storage medium stores instructions, and a processor executes the instructions to perform the methods described herein. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Any of these devices may have computer readable instructions for carrying out the steps of the methods described above with reference to  FIG. 6 . 
     The computer program instructions may be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks. 
     Furthermore, the computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. 
     In case of implementing the devices and methods herein by software and/or firmware, a program constituting the software may be installed into a computer with dedicated hardware, from a storage medium or a network, and the computer is capable of performing various functions if with various programs installed therein. 
     In the case where the above-described series of processing is implemented with software, the program that constitutes the software may be installed from a network such as the Internet or a storage medium such as the removable medium. Examples of a removable medium include a magnetic disk (including a floppy disk), an optical disk (including a Compact Disk-Read Only Memory (CD-ROM) and a Digital Versatile Disk (DVD)), a magneto-optical disk (including a Mini-Disk (MD) (registered trademark)), and a semiconductor memory. Alternatively, the storage medium may be the ROM, a hard disk contained in the storage section of the disk units, or the like, which has the program stored therein and is distributed to the user together with the device that contains them. 
     As will be appreciated by one skilled in the art, aspects of the devices and methods herein may be embodied as a system, method, or computer program product. Accordingly, aspects of the present disclosure may take the form of an entirely hardware system, an entirely software system (including firmware, resident software, micro-code, etc.) or an system combining software and hardware aspects that may all generally be referred to herein as a “circuit,” “module”, or “system.” Furthermore, aspects of the present disclosure may take the form of a computer program product embodied in one or more computer readable medium(s) having computer readable program code embodied thereon. 
     Any combination of one or more computer readable non-transitory medium(s) may be utilized. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The non-transitory computer storage medium stores instructions, and a processor executes the instructions to perform the methods described herein. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: an electrical connection having one or more wires, 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), an optical fiber, a magnetic storage device, a portable compact disc Read Only Memory (CD-ROM), an optical storage device, a “plug-and-play” memory device, like a USB flash drive, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. 
     A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. 
     Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including, but not limited to, wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing. 
     Computer program code for carrying out operations for aspects of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++, or the like and conventional procedural programming languages, such as the “C” programming language or similar programming languages. The program code may execute entirely on the user&#39;s computer, partly on the user&#39;s computer, as a stand-alone software package, partly on the user&#39;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&#39;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). 
     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 devices and methods herein. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block might 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 combinations of special purpose hardware and computer instructions. 
     Many computerized devices are discussed above. Computerized devices that include chip-based central processing units (CPU&#39;s), input/output devices (including graphic user interfaces (GUI), memories, comparators, processors, etc. are well-known and readily available devices produced by manufacturers such as Dell Computers, Round Rock Tex., USA and Apple Computer Co., Cupertino Calif., USA. Such computerized devices commonly include input/output devices, power supplies, processors, electronic storage memories, wiring, etc., the details of which are omitted herefrom to allow the reader to focus on the salient aspects of the embodiments described herein. Similarly, scanners and other similar peripheral equipment are available from Xerox Corporation, Norwalk, Conn., USA and the details of such devices are not discussed herein for purposes of brevity and reader focus. 
     The terms printer or printing device as used herein encompasses any apparatus, such as a digital copier, bookmaking machine, facsimile machine, multi-function machine, etc., which performs a print outputting function for any purpose. The details of printers, printing engines, etc., are well known by those ordinarily skilled in the art and are discussed in, for example, U.S. Pat. No. 6,032,004, the complete disclosure of which is fully incorporated herein by reference. Such details are not described in detail herein to keep this disclosure focused on the salient features presented. The devices and methods herein can encompass devices that print in color, monochrome, or handle color or monochrome image data. All foregoing devices and methods are specifically applicable to electrostatographic and/or xerographic machines and/or processes. 
     The terminology used herein is for the purpose of describing particular devices and methods only and is not intended to be limiting of this disclosure. As used herein, the singular forms “a”, “an”, and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising,” “including” and/or “includes”, when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     In addition, terms such as “right”, “left”, “vertical”, “horizontal”, “top”, “bottom”, “upper”, “lower”, “under”, “below”, “underlying”, “over”, “overlying”, “parallel”, “perpendicular”, etc., used herein, are understood to be relative locations as they are oriented and illustrated in the drawings (unless otherwise indicated). Terms such as “touching”, “on”, “in direct contact”, “abutting”, “directly adjacent to”, etc., mean that at least one element physically contacts another element (without other elements separating the described elements). Further, the terms ‘automated’ or ‘automatically’ mean that once a process is started (by a machine or a user); one or more machines perform the process without further input from any user. 
     The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The descriptions of the various devices and methods of the present disclosure have been presented for purposes of illustration, but are not intended to be exhaustive or limited to the devices and methods disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described devices and methods. The terminology used herein was chosen to best explain the principles of the devices and methods, the practical application or technical improvement over technologies found in the marketplace, or to enable others of ordinary skill in the art to understand the devices and methods disclosed herein. 
     It will be appreciated that the above-disclosed 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. Unless specifically defined in a specific claim itself, steps or components of the devices and methods herein cannot be implied or imported from any above example as limitations to any particular order, number, position, size, shape, angle, color, or material. 
     Therefore, disclosed above are systems that allow for concurrent leading edge registration and side edge registration of print media sheet(s). Specifically, in these systems, one or more segmented scuffer disks are mounted to an axle above a tray. The segmented scuffer disk(s) can each comprise multiple segments and, as the axle rotates, these segments can engage a print media sheet in the tray (e.g., the top print media sheet on a stack in the tray) and can continuously force that print media sheet in a first direction (i.e., in a process direction) against a leading edge registration guide. The segments of the scuffer disk can also be independently flexible in a second direction (i.e., in a cross-process direction) perpendicular to the first direction. This independent flexibility allows tamper(s) on the side of the tray to perform a tamping process in the second direction at the same time as the print media sheet is forced in the first direction, thereby avoiding any slippage of the print media sheet away from the leading edge registration guide. Also disclosed herein are associated methods.