Patent Publication Number: US-8116671-B2

Title: Apparatuses useful in printing onto media and methods of mitigating media edge wear effects on fixing belts in printing

Description:
BACKGROUND 
     Some printing apparatuses include a nip formed by a roll and a belt. In these apparatuses, media are fed to the nip and contacted by the roll and belt to fix marking material onto the media. In these apparatuses, edges of the media can produce edge wear of the belt. Such edge wear can reduce image quality and reduce the life of the belt. 
     It would be desirable to provide apparatuses useful in printing onto media and methods that can mitigate edge wear of belts that contact the media. 
     SUMMARY 
     Apparatuses useful in printing onto media and methods of mitigating media edge wear effects on fixing belts in printing are provided. An exemplary embodiment of the apparatuses comprises a first roll including a first surface; a second roll including a second surface; a fixing member including a third surface; a fixing belt supported on the first surface and second surface, the fixing belt including a surface forming a nip with the fixing member; a registration distribution system for translating the first roll, second roll, fixing member and fixing belt, as a unit, transversely with respect to a media travel path of media received at the nip; and a belt steering mechanism connected to the second roll for translating the fixing belt across the first surface of the first roll at the nip, transversely to the media travel path, while the registration distribution system translates the first roll, second roll, fixing member and fixing belt transversely to the media travel path. 
    
    
     
       DRAWINGS 
         FIG. 1  depicts an exemplary embodiment of a printing apparatus. 
         FIG. 2  depicts an exemplary embodiment of an apparatus useful in printing including a belt and roll forming a nip. 
         FIG. 3  depicts a medium being fed to the nip in the apparatus shown in  FIG. 2 . 
         FIG. 4  depicts a wear distribution profile along a surface of a fixing belt in the axial direction of a fixing device from an outboard edge (OB) to an inboard edge (IB) for 11 inch and 14 inch media in an apparatus including a registration distribution system (RDS) that provides linear RDS movement without fixing belt steering, showing a uniform edge wear distribution profile (top left curve) and an edge wear distribution profile with backlash and banding at RDS home positions (bottom left curve). 
         FIG. 5  depicts modeled wear distribution profiles along a fixing belt surface in the axial direction of a fixing device for the case where the fixing device is moved using a registration distribution system without fixing belt steering to smooth the edge slope, for the case of no backlash and no fixing belt steering, for the case of 2 mm linear smoothing, and the case of 4 mm sinusoidal smoothing. 
         FIG. 6  depicts an exemplary relationship between fixing belt displacement in the width direction of a fixing belt and print number and edge pattern, respectively, using a linear RDS motion pattern for moving the fixing device in an apparatus including a registration distribution system (top curve) and fixing belt steering, and between fixing belt displacement in the axial direction and print number and total edge wear distribution, respectively, (bottom curve). 
         FIG. 7  depicts an exemplary bell-shaped, edge wear growth pattern in the width direction of a fixing belt produced by using a linear RDS motion pattern for moving the fixing device in an apparatus including a registration distribution system with fixing belt steering. 
         FIG. 8  depicts an exemplary embodiment of a registration distribution system for translating a fixing device relative to a media path in an apparatus useful in printing onto media. 
     
    
    
     DETAILED DESCRIPTION 
     The disclosed embodiments include apparatuses useful in printing onto media. An exemplary embodiment of the apparatuses comprises a first roll including a first surface; a second roll including a second surface; a fixing member including a third surface; a fixing belt supported on the first surface and second surface, the fixing belt including a surface forming a nip with the fixing member; a registration distribution system for translating the first roll, second roll, fixing member and fixing belt, as a unit, transversely with respect to a media travel path of media received at the nip; and a belt steering mechanism connected to the second roll for translating the fixing belt across the first surface of the first roll at the nip, transversely to the media travel path, while the registration distribution system translates the first roll, second roll, fixing member and fixing belt transversely to the media travel path. 
     The disclosed embodiments further include fixing devices. An exemplary embodiment of the fixing devices comprises a first roll including a first surface; a second roll including a second surface; a third roll including a third surface; a fixing belt supported on the first surface and the second surface, the fixing belt including a surface forming a nip with the third surface; a registration distribution system for translating the first roll, second roll, third roll and fixing belt, as a unit, transversely to a media travel path of media received at the nip; and a belt steering mechanism connected to the second roll for translating the fixing belt across the first surface of the first roll, at the nip, transversely to the media travel path, while the registration distribution system translates the first roll, second roll, third roll and fixing belt transversely to the media travel path. 
     The disclosed embodiments further include methods of mitigating media edge wear effects on fixing belts in apparatuses useful in printing onto media. In an exemplary embodiment of the methods, the apparatus comprises a first roll including a first surface, a second roll including a second surface, a fixing member including a third surface and a fixing belt supported on the first surface and second surface, with the fixing belt including a surface forming a nip with the fixing member. The method comprises feeding a medium to the nip along a media travel path; translating the first roll, second roll, fixing member and fixing belt, as a unit, transversely to the media travel path with a registration distribution system; and translating the fixing belt across the first surface at the nip, transversely to the media travel path, with a belt steering mechanism connected to the second roll, while the registration distribution system translates the first roll, second roll, fixing member and fixing belt transversely to the media travel path. 
     As used herein, the term “printing apparatus” encompasses apparatuses, such as digital copiers, facsimile machines, bookmaking machines, multifunction machines, and the like, or portions of such apparatuses, that perform a print outputting function for any purpose. 
       FIG. 1  illustrates an exemplary printing apparatus  100  as disclosed in U.S. Patent Application Publication No. 2008/0037069, which is incorporated herein by reference in its entirety. The printing apparatus  100  can be used to produce prints from various types of media, such as coated or un-coated (plain) paper sheets, having various sizes and weights. The printing apparatus  100  includes two media feeder modules  102  arranged in series, a printer module  106  adjacent the media feeder modules  102 , an inverter module  114  adjacent the printer module  106 , and two stacker modules  116  adjacent the inverter module  114 . 
     In the printing apparatus  100 , the media feeder modules  102  feed media to the printer module  106 . In the printer module  106 , marking material (toner) is transferred from the developer stations  110  to a charged photoreceptor belt  108  to form toner images on the photoreceptor belt and produce prints. The toner images are transferred to one side of respective media  104  fed through the paper path. The media are advanced through a fixing device  200  including opposed rolls  113 ,  115  forming a nip to fix the toner images onto the media. The inverter module  114  manipulates media exiting the printer module  106  by either passing the media through to the stacker modules  116 , or inverting and returning the media to the printer module  106 . In the stacker modules  116 , the media are loaded onto stacker carts  118  to form stacks  120 . 
       FIG. 2  illustrates an exemplary embodiment of an apparatus useful in printing onto media including a fixing device  200 . The fixing device  200  includes a fixing roll  216  including an outer surface  217 , and a pressure roll  250  having an outer surface  252  forming a nip  254  with the outer surface  217 . In embodiments, the fixing roll  216  can be driven by a drive mechanism and the pressure roll  250  connected to a cam, or the like. The fixing roll  216  and pressure roll  250  rotate in opposite directions as indicated by respective arrows  286  and  284 . At the nip  254 , the fixing roll  216  and pressure roll  250  apply heat and pressure to fix marking material onto media fed to the nip  254  in the process direction A. 
     The fixing roll  202  can include a core and at least one layer overlying the core. For example, the core can be comprised of aluminum, or the like; an inner layer on the core can be comprised of an elastomeric material, such as silicone, or the like; and an outer layer including the outer surface  217  can be comprised of a fluoroelastomer sold under the trademark Viton® by DuPont Performance Elastomers, L.L.C., or the like. 
     The fixing roll  216  includes one or more heating elements (two heating elements  230  are shown). In embodiments, the heating elements  230  can be axially-extending lamps, or the like, powered by a power supply (not shown). 
     The pressure roll  250  can include a core and one or more layers overlying the core. For example, the core can be comprised of aluminum or the like, and an outer layer can be comprised of a suitable polymer, such as perfluoroalkoxy (PFA) copolymer resin, or the like. 
     The fixing device  200  includes a continuous fixing belt  210  having an inner surface  212  and an outer surface  214 . An exemplary embodiment of the fixing belt  210  can comprise a base layer of polyimide, or like polymer; an intermediate layer of silicone, or the like, on the base layer; and an outer layer comprised of a conformable material, such as a fluoroelastomer sold under the trademark Viton® by DuPont Performance Elastomers, L.L.C., or a like polymer, on the intermediate layer. The base layer forms the inner surface  212  of the fixing belt  210 , and the outer layer forms the outer surface  214 . 
     The fixing belt  210  is supported on the outer surface  217  of the fixing roll  216 , an external roll  218 , internal rolls  218 ,  224  and a tension control roll  222 . The external roll  218 , internal roll  220  and tension control roll  222  include respective surfaces  219 ,  221  and  223  contacting the fixing belt  210 . 
     The fixing belt  210  is heated by one or more of the supporting rolls. In embodiments, the fixing roll  216  and at least one of the external roll  218 , internal roll  220  and tension control roll  222  can include an internal heat source  230  to supply thermal energy to the fixing belt  210 , as shown. In embodiments, the heat sources  230  can be axially-extending heating lamps. The heat sources  230  can heat the belt  210  to a temperature effective to fix marking material onto media at the nip  254 . 
     A belt steering mechanism  280  is operatively coupled to the steering control roll  222 . The belt steering mechanism  280  includes a drive mechanism for steering the fixing belt  210  in an axial direction of the fixing device  200  with respect to the steering control roll  222 , fixing roll  216 , external roll  218  and internal roll  220 . The orientation of the steering control roll  222  with respect to the fixing belt  210  is adjustable to change the direction of translation and lateral travel speed of the fixing belt  210 . For example, the fixing belt  210  can be translated at a speed of less than about 1 mm/sec, such as less than about 0.5 mm/sec, relative to a fixed point in the apparatus. 
     A liquid supply system  260  is positioned to supply a liquid release agent to the outer surface  217  of the fixing roll  216 . The liquid supply system  260  includes a metering roll  262  with an outer surface  263  and a donor roll  264  with an outer surface  265 . The metering roll  262  contacts liquid release agent  266  contained in a sump  268 . The metering roll  262  and donor roll  264  convey the release agent  266  from the sump  268  to the metering roll  262 , from the metering roll  262  to the donor roll  264 , and from the donor roll  264  to the outer surface  214  of the fixing belt  210 . 
     The fixing device  200  further includes a belt cleaning system  270  including a cleaning web  272 . The cleaning web  272  is supported on a web nip roll  276  connected to a web supply roll  278  and a web take-up roll  274 . The cleaning web  272  is unwound from the web supply roll  278  and taken-up on the web take-up roll  274 . The cleaning web  272  cleans the outer surface  214  of the fixing belt  210 . 
       FIG. 3  depicts a portion of the fixing device  200  shown in  FIG. 2  including an exemplary embodiment of the fixing roll  216  and fixing belt  210 .  FIG. 3  shows the locations of media registration edge  295 , outer edge  297 , inside media path length  298  and outside media path length  299  of the fixing belt  210 . The inside media path length  298  corresponds to the width of the medium  213 , which has an inner edge IE registered at the media registration edge  295  and an outer edge OE positioned at outer edge  297  with respect to the outer surface  214  of the fixing belt  210 . For example, the medium  213  can have a width of 11 inches (279 mm). The outside media path of the outer surface  214  is not contacted by the medium  213  when registered at the media registration edge  295 . The outside media path is contacted by wider media. The location of an outer edge  301  of a wider medium, such as media having a width of 14 inches (356 mm), is shown. 
     When the medium  213  traveling in the process direction A is received at the nip  254  of the fixing device  200 , the pressure roll  250  applies pressure to the fixing belt  210 . This pressure acts at the inner edge IE of the medium  213 , which is positioned at the media registration edge  295 , and at the outer edge OE of the medium  213 , which is positioned at the outer edge  297  of the inside media path length  298 . This pressure produces mechanical strain on the outer layer of the fixing belt  210 . Consequently, the outer surface  214  of the fixing belt  210  can be abraded at the locations of the media registration edge  295  and/or outer edge  297  at which the inner edge IE and outer edge OE of the medium  213  contact the outer surface  214 . Elastomeric materials underlying the outer layer can also be abraded. This abrasion can produce edge wear in the outer surface  214  at the locations corresponding to the media registration edge  295  and outer edge  297 . Such edge wear can cause fixing belts to fail. Edge wear also causes differential gloss artifacts in images formed on media when surface defects in the outer surface  214  of the fixing belt  210  are transferred to the media. 
     To mitigate the severity of edge wear in the fixing device  200 , the entire fixing device  200  can be translated axially back and forth between maximum travel positions using a registration distribution system (RDS)  290 . An exemplary embodiment of the registration distribution system  290  for use in the fixing device  200  is disclosed in U.S. Pat. No. 7,013,107, which is incorporated herein by reference in its entirety. 
     It has been noted that in registration distribution systems including a drive motor that stops and reverses direction when a maximum travel position is reached, “backlash” may occur in the drive system during the stopping and reversing of direction by the drive motor. For example, in registration distribution systems including a drive motor that moves the fixing device continuously from one maximum travel position to the other, there is a dwell period due to drive motor reversal at the end of each travel of the fixing device from one maximum travel position to the opposite maximum travel position. Backlash results in loss of motion of the fixing device at the maximum travel positions for the dwell period. During each dwell period, extra media pass over the same section of the fixing belt surface before motion of the fixing device in the opposite direction is resumed. The extra media increase edge wear at the sections of the fixing belt surface. 
     The fixing device  200  is translated relative to the fixed travel path of medium  213  traveling in process direction A using the registration distribution system  290 . The fixing device  200  can be translated perpendicularly to the process direction A, across the media travel path. For example, the fixing device  200  can be translated in the direction B ( FIG. 3 ) from a first endpoint to a second endpoint, then in the opposite direction C ( FIG. 3 ) from the second endpoint back to the first endpoint, then in the direction B from the first endpoint to the second endpoint, then in the direction C from the second endpoint back to the first endpoint, etc. The distance and speed of travel in the direction B can be the same as that in the direction C. Using this pattern, the fixing device  200  can be moved repeatedly by the same distance and at the same speed in both directions B and C. This movement of the fixing device  200  axially distributes the positions of the media registration edge  295  and the outer edge  297 , and the associated edge wear, over the outer surface  214  of the fixing belt  210 . 
     It has been noted that when the fixing device  200  is translated continuously from the first endpoint to the second endpoint, then continuously from the second endpoint back to the first endpoint, in a repeated manner, a distinct step profile may form on the outer surface  214  of the fixing belt  210  at the locations of the first and second endpoints of travel. The step profile can transfer to media at the nip  254  and cause image artifacts, as well as shorten the service life of the fixing belt  210 . 
     It has also been noted that when the registration distribution system  290  is not activated in the fixing device  200  and the fixing device  200  is not translated relative to the media travel path, or when the registration distribution system  290  is activated to translate the fixing device  200  while running heavy-weight media, circumferentially-extending abrasions can develop in the outer surface  214  of the fixing belt  210 . These abrasions can map to distinct lines formed on media passed through the fixing device  200 . This image artifact is referred to as “banding.” 
       FIG. 4  depicts an exemplary wear distribution pattern formed on an outer surface of a fixing belt of a fixing device, as a function of the number of edges/mm and sheets in the axial direction along the outer surface, in an apparatus including a registration distribution system. Wear distribution patterns are shown for 11 inch and 14 inch media. In  FIG. 4 , “OB” and “IB” indicate the positions of the outboard and inboard edges of the fixing belt.  FIG. 4 , top left curve, shows an intended uniform media edge distribution profile at registration distribution system home positions (i.e., maximum travel positions of the fixing belt). In this profile, the effects of backlash on edge wear are spread out along the axial direction of the outer surface of the fixing belt. 
       FIG. 4 , bottom left curve, shows an edge distribution profile at registration distribution system home positions when motor reversal backlash occurs during travel of the fixing belt, when the fixing belt is moved to the same two end positions during travel. As shown, the backlash produces a higher concentration of paper edges at the ends of the profile corresponding to the maximum travel positions of the fixing belt. As a result, differential gloss increases significantly when the fixing belt is positioned at each end of travel of the RDS travel zone. 
       FIG. 4 , bottom left curve, also shows banding (represented by smaller peaks) occurring between the two end positions with the use of the registration distribution system. Such banding, in addition to backlash, can occur when heavy-weight paper is run in the fixing device. 
     In light of these observations, apparatuses useful in printing onto media that are constructed to mitigate edge wear are provided. Embodiments of the apparatuses can mitigate edge wear of surfaces of fixing belts by moving the fixing belts using two different mechanisms simultaneously. In embodiments, the fixing belt is moved by combining motions provided by a registration distribution system, which can move the entire fixing device including the fixing belt, and a belt steering system, which can simultaneously move the fixing belt with respect to the moving fixing device. In the apparatuses, the fixing belt can be maintained within a desired axial spatial range relative to the fixing belt by the belt steering system. The belt steering system can move the fixing belt in a constant back and forth motion, for example, to distribute the edge wear within the range. When the belt steering motion is combined with the motion of the fixing device provided by the registration distribution system, the belt steering can mitigate the effects of both backlash and banding. 
     Embodiments of the registration distribution system translate the fixing device relative to the media travel path of media through the nip. The media travel path is typically fixed in the apparatuses. The fixing device  200  ( FIG. 2 ) can be translated axially relative to the travel path of the medium  213  through the nip  254 . Embodiments of the fixing device  200  can have a modular construction, and the entire module can be translated using a registration distribution system  290  connected to the fixing device  200 . The registration distribution system  290  can include an external drive mechanism constructed to translate the entire fixing device  200  in the desired manner. 
     The fixing device  200  is moved relative to the media travel path by the registration distribution system  290  when printing is performed in the apparatus. The movement of the fixing device  200  can be started when media approaching the nip  254  are sensed. Media can be sensed by an optical sensor, or the like, positioned along the media travel path at a location upstream from the nip  254  in the apparatuses. Alternatively, media can be sensed with a digital front end, which initiates the printing process and notifies each sub-system that media are arriving. In embodiments, when printing is resumed after delay or completion of a previous print run, the movement of the fixing device  200  is resumed from the position it stopped at, i.e., the starting position of the fixing device  200  is not re-set when printing is resumed. 
     The fixing device  200  can be translated continuously in direction C ( FIG. 3 ) to move a reference position on the fixing belt  210  (e.g., media registration edge  295 ), and then translated continuously in the reverse direction D ( FIG. 3 ) to move the reference position in that direction. The directions C and D can be perpendicular to the process direction A. This back and forth motion of the fixing device is repeated during printing. 
     While the fixing device  200  is being translated relative to the media travel path by the registration distribution system  290 , the fixing belt  210  is also moved with respect to the outer surface  217  of the fixing roll  216  by the belt steering mechanism  280  coupled to the steering control roll  222 . The fixing device  200  is moved by the registration distribution system  290  at a speed, s fd , (relative to a fixed point in the apparatus), while the fixing belt  210  is moved at a speed, s fb/fd , relative to the moving fixing device  200  by the belt steering mechanism  280 . 
     In embodiments, the belt steering mechanism  280  can translate the fixing belt  210  at a uniform speed back and forth (i.e., a triangular waveform). In other embodiments, the belt steering mechanism  280  can move the fixing belt  210  according to other forms, such as a triangular form (i.e., s=sin(t), where s is speed and t is time). 
       FIG. 3  shows that the fixing belt  210  can be moved in a first direction, a, and then in an opposite second direction, b, relative to the outer surface  217  of the fixing roll  216  by the belt steering mechanism  280 . The direction a and the direction b along which the fixing belt  210  is moved can be parallel to the directions, A and B, along which the fixing device  200  is moved. The belt steering mechanism  280  can translate the fixing belt  210  continuously in the direction a, and continuously in the direction b, relative to the outer surface  217  of the moving fixing roll  216 . The fixing belt  210  can be translated at a different speed than the entire fixing device  200  (relative to a fixed point in the apparatus). Both backlash and banding can be masked by this motion of the fixing belt  210 . 
       FIG. 5  illustrates modeled results demonstrating effects of smoothing provided by moving a fixing belt using a belt steering mechanism in a fixing device. As shown, a curve with “0.5 backlash” (about 0.5 mm backlash) has a peak value of 12,600 edges/mm. This curve corresponds to a case where the fixing device is moved relative to the media travel path using a registration distribution system, but without belt steering, i.e., “smoothing,” to smooth the wear distribution profile.  FIG. 5  also shows a curve for a case of using no smoothing (“no smoothing edge slope”), where the nominal case of no backlash is modeled. For this curve, the axial variation in edge location due to sheet registration is shown. 
       FIG. 5  also shows a curve for the case of moving the fixing device linearly with a registration distribution system in combination with steering the fixing belt using a 2 mm linear smoothing motion, with 0.5 mm backlash; and a curve for the case of moving the fixing device linearly with a registration distribution system in combination with steering the fixing belt using a 4 mm smoothing motion with a sinusoidal waveform, with 0.5 mm backlash. The edge wear is smoothed over a larger range using the 4 mm smoothing motion. These two curves demonstrate that using a smoothing profile can spatially distribute edge wear on the fixing belt to mask the effects of backlash, and that combining a linear motion of the fixing device provided by a registration distribution system with a belt smoothing motion provided by belt steering mechanism also masks banding. 
     In addition to backlash and banding, two other edge wear profile characteristics that can be addressed by the combined use of a registration distribution system and a belt steering mechanism are the shape and growth of the edge wear profile. The shape of the edge wear profile is dependent on the types of media that are run in the fixing device and the degree of uniformity of movement of the fixing device by the registration distribution system. 
     For the growth of the edge wear profile, edge wear density is proportional to the differential gloss. To make edge wear artifacts less visible on prints, it is desirable to produce a bell-shaped edge wear profile that is smooth during the entire service life of the fixing belt. 
     In the fixing device, the fixing belt  210  is actively steered by the belt steering mechanism  280  to be maintained within a desired range with respect to the outer surface  214  of the fixing belt  210 . Media edges are distributed over the outer surface  214  of the fixing belt  210  by the belt steering mechanism  280 . The steering range of the fixing belt  210  is limited by the width of the fixing belt  210  and the length of the outer surface  217  of the fixing roll  216 . The registration distribution system  290  distributes the media edges over a wider range on the outer surface  214  of the fixing belt  210 . By using a constant steering motion produced by the belt steering mechanism  280  in combination with the registration distribution system  290 , backlash and banding, which can occur when using the registration distribution system  290  alone, are smoothed out. 
       FIG. 6  shows the media edge wear accumulation or density (number of prints as a function of displacement along the outer surface  214  of the fixing belt  210 ) when the fixing belt  210  is moved in the fixing device  200  using a combined motion provided by the registration distribution system  290  and the belt steering mechanism  280 . The top curve shows the number of prints as a function of edge position and the bottom curve shows the total edge wear distribution (i.e., accumulated number of media edges). The media edge density has a smooth profile, with the shape of the profile being dependent on the belt steering range provided by the belt steering mechanism  280  and the travel speed and travel distance of the fixing device provided by the registration distribution system  290 . In embodiments, the slope and peak of the media edge density profile can be optimized to maximize fixing belt edge wear life. 
       FIG. 7  depicts a modeled desirable edge wear growth profile resulting from moving the fixing device  200  using the registration distribution system  290  and moving the fixing belt  210  using the belt steering mechanism  280 . As shown, the profile resembles a bell shape as the edge wear accumulates. 
     In embodiments, the motion pattern provided by using the registration distribution system  290  can be adjusted based solely on visual observations of the edge wear profile of the fixing belt  210 , without also taking into consideration a characteristic of the media run in the apparatus to produce the edge wear profile, such as media weight. For example, the edge wear shape can be observed or measured after a certain number of prints (e.g., 10,000 prints) have been made with the fixing device  200 . Based on the edge wear shape, the motion pattern can be adjusted to compensate for undesirable aspects of the observed wear profile and produce a profile having a desired shape, e.g., the bell shape shown in  FIG. 7 . 
     In embodiments, feedback of image gloss measurements, which relate to edge wear density, can be used for motion adjustment purposes. Based on this feedback, the movement of the fixing device  200  by the registration distribution system  290  can be controlled to smooth transient gloss in real time, or periodically at selected times. In the fixing device  200 , the belt steering functions as a fast local actuator and the registration distribution system  290  functions as a slow global actuator. The use of the registration distribution system  290  combined with belt steering can generate desired edge wear density profiles. For example, the travel speed of the fixing device  200  provided by the registration distribution system  290  can be adjusted based on feedback to conform the edge density profile to a bell shape. For printing heavy-weight media, the fixing device  200  can be moved at a higher speed to reduce banding and maintain a smooth bell shape of the edge density profile. 
     In embodiments, the motion of the fixing device  200  provided by the registration distribution system  290  and the motion of the fixing belt  210  provided by the belt steering mechanism  280  can be independent of each other, i.e., not correlated. For example, the motion of the fixing device  200  provided by the registration distribution system  290  can be adjusted without also adjusting the motion of the fixing belt  210  provided by the belt steering mechanism  280 . 
     In embodiments, the methods of mitigating edge wear of fixing belts in apparatuses useful in printing onto media can be integrated in closed-loop edge wear control systems.  FIG. 8  depicts an exemplary embodiment of the registration distribution system  290  shown in  FIG. 2 . The registration distribution system  290  includes a data source  314  connected over a link to an input/output (I/O) interface  302 . A data sink  316  is connected to the input/output interface  302  through a link. Each of the links can be implemented using any known or later developed device or system for connecting the data source  314  and the data sink  316 , respectively, to the registration distribution system  290 . 
     The input/output interface  302  inputs data from the data source  314  and outputs data to the data sink  316  via the link. The input/output interface  302  also provides the received data to one or more of a controller  304 , memory  308 , and an algorithm or look-up table  306 . The input/output interface  302  receives data from one or more of the controller  304 , memory  308 , and/or the algorithm or look-up table  306 . 
     The algorithm or look-up table  306  provides instructions to the controller  304  based on data to smooth the edge wear profile of the fixing belt  210 . The controller  304  controls the drive motor  310  to move the fixing device  200  according to the instruction sent to the controller  304  by the algorithm or look-up table  306 . The algorithm or look-up table  306  may be implemented as a circuit or routine of a suitably programmed general purpose computer. 
     The memory  308  stores data received from the algorithm or look-up table  306 , the controller  304 , and/or the input/output interface  302 . The memory  308  can also store control routines used by the controller  304  to operate the drive motor  310  to move the fixing device  200  according to the algorithm or look-up table  306  upon receipt of a signal from a sensor  312 . In embodiments, the sensor  312  detects the location of a reference point of the fixing device  200 , such as a point on the fixing belt  210 , relative to a fixed position, such as one edge of the media travel path through the nip. 
     In one exemplary embodiment of the registration distribution system  290 , the sensor  312  is tripped by a flag provided on the fixing device  200 , causing a signal to be sent to the input/output interface  302 . The signal is also sent to the memory  308  and the algorithm or look-up table  306  via the bus  318 . The instructions for moving the fixing device  200  are sent from the algorithm or look-up table  306  to the drive motor  310 . The drive motor  310  can be synchronized with the sensor  312  to move the fixing device  200  in opposite axial directions, such as depicted in  FIG. 3 . 
     It will be understood that the teachings and claims herein can be applied to any treatment of marking materials on media. For example, the marking material can be toner, liquid or gel ink, and/or heat- or radiation-curable ink. The process conditions, such as temperature, pressure and dwell time, which may be suitable for treating different marking materials, may vary in different embodiments of the apparatuses and methods. 
     It will be appreciated that various ones of the above-disclosed, as well as other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Also, 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.