Patent Publication Number: US-10307796-B2

Title: Card for cleaning printed media transport system and method of using same

Description:
RELATED APPLICATIONS AND CLAIM OF PRIORITY 
     This patent document claims priority to U.S. Provisional Patent Application No. 62/562,640, filed Sep. 25, 2017 (the “&#39;640 application”). This patent document also claims priority to, and is a continuation-in-part of, U.S. patent application Ser. No. 15/896,336, filed Feb. 14, 2018, which issued on Jan. 29, 2019 as U.S. Pat. No. 10,189,650, which claims priority to the &#39;640 application. The disclosures of each priority application are fully incorporated into this document by reference. 
    
    
     BACKGROUND 
     Many machines have media transport mechanisms that receive printed media into the machine and move the media through one or more sections of the machine to perform various processes on the media. For example, a financial transaction terminal such as an automated teller machine may do any or all of the following steps: (i) receive printed currency notes, checks, receipts, coupons, tickets and other printed media; (ii) align the media to an internal reference; (iii) use a camera and/or other sensors to detect what the media is and/or what is printed on the media; (iv) apply additional printed markings to the media; and/or (v) move the media to an appropriate shuttle, bin or exit port. The terminal may perform some or all of these steps, and/or additional steps. Other machines that include media transport mechanisms include coupon printers, ticket printers, ticket-taking devices and other printed media handling systems. 
     Because printed media can pass through a variety of human hands and environmental conditions before it is inserted into a media transport mechanism, printed media often is at least partially coated with dirt, oil and/or other contaminants. When the printed media passes through the media transport mechanism, the contaminants can transfer from the printed media to the mechanism&#39;s rollers, belts, other conveyors, and other components that contact the printed media. Over time, these contaminants can build up and cause the machine to malfunction. 
     The removal of contaminants from a media transport mechanism is a labor-intensive and, time-consuming process. It requires a technician to open the device and carefully clean small parts by hand. Many of these parts are in small, hard-to-reach spaces. Thus, manual cleaning is difficult, and it is not always effective. 
     This document describes methods and systems directed to solving some of the issues described above, and/or other issues. 
     SUMMARY 
     In various embodiments, a method of cleaning a media travel pathway of a media transport device includes opening a first section of a media transport device that includes belts, rollers and/or other media conveyors. The method also includes positioning a first cleaning substrate in the first section without operating a motor that actuates the media conveyors. The method also includes closing the first section so that at least some of the media conveyors contact the first cleaning substrate. The method also includes operating the motor of the media transport device so that the media conveyors move, contact the first cleaning substrate and are cleaned while the first cleaning substrate remains substantially fixed within the first section of the media transport device. 
     Optionally, opening the first section creates a first portal that is not accessible during operation of the motor of the media transport device, and placing the first cleaning substrate in the first section comprises accessing the section through the first portal. Optionally, the method also may include opening the first portal to remove the first cleaning substrate from the first section. 
     Optionally, before opening the first section, the method may include operating the motor and, while operating the motor, placing a second cleaning substrate into a second portal that is accessible during operation of the motor so that (i) the second cleaning substrate is received into, and moves through the media transport device, and (ii) the second cleaning substrate contacts the media conveyors while the second cleaning substrate moves through the media transport device. 
     Optionally, if the first cleaning substrate includes scarifying holes, the positioning step may include aligning the scarifying holes to at least some of the media conveyors, such as drive roller/idle roller pairs. 
     Optionally, if the first cleaning substrate has multiple alignment positions. positioning the first cleaning substrate in the first section may include positioning the first cleaning substrate in a first one of the alignment positions, and after operating the media transport device the method may include: (i) opening the first section; (ii) repositioning the cleaning substrate to a second position in the first section according to a second one of the alignment positions; (iii) closing the first section; and (iv) operating the media transport device again so that at least some of the media conveyors turn, contact the cleaning substrate and are further cleaned while the cleaning substrate remains substantially fixed in the second position. 
     Optionally, before operating the media transport device, the method may include: (i) opening a second section of the media transport device; (ii) positioning a second cleaning substrate in the second section without operating the motor; (iii) closing the second section so that at least some media conveyors in the second section contact the second cleaning substrate; and (iv) operating the media transport device may include causing the belts or rollers in the second section to turn, contact the second cleaning substrate and be cleaned while the second cleaning substrate remains substantially fixed within the second section of the media transport device. 
     Optionally, positioning the cleaning substrate in the section may include placing the cleaning substrate in the section and securing the substrate within the section by: (a) connecting a locking member of the cleaning substrate to a post of the media transport device; or (b) by the closing of the first section, causing the second section to apply sufficient pressure to the cleaning substrate that the cleaning substrate is compressed and held by friction against interior components of the first section. 
     Optionally, positioning the first cleaning substrate in the first section may include positioning an opening of the first cleaning substrate over a media sensor of the media transport device. 
     In various embodiments, a method of cleaning a media travel pathway of a media transport device includes the steps of inserting a cleaning substrate into a section of a media transport device. The cleaning substrate includes a plurality of scarifying holes. The media transport device comprises a plurality of drive roller/idle roller pairs. The method includes positioning the cleaning substrate in the section so that at least a first one of the scarifying holes of the cleaning substrate is positioned to contact a drive roller or idle roller of a first corresponding one of the drive roller/idle roller pairs. The method includes operating the media transport device to cause the first scarifying hole to clean the idle roller of the first corresponding drive roller/idle roller pair. 
     Optionally, before the inserting, the method may include opening the section of the media transport device to form a portal that is not accessible during operation of the media transport device, and placing the cleaning substrate in the section comprises accessing the section through the portal. After operating the media transport device, the section may be opened and the cleaning substrate may be removed from the section. Optionally, if the cleaning substrate is configured to have a plurality of alignment positions, positioning the cleaning substrate in the section may include positioning the cleaning substrate in a first one of the alignment positions, and after operating the media transport device the section may be opened and the cleaning substrate may be repositioned to a second position in the section according to a second one of the alignment positions in which a second one of the scarifying holes of the cleaning substrate is positioned to contact a drive roller or idle roller of a second corresponding one of the drive roller/idle roller pairs. Optionally, before operating the motor, the method may include opening a second section of the media transport device, positioning a second cleaning substrate in the second section without operating the motor, and closing the second section so that at least some media conveyors in the second section contact the second cleaning substrate. If so, then operating the media transport device also comprises causing the media conveyors in the second section to turn, contact the second cleaning substrate and be cleaned while the second cleaning substrate remains substantially fixed within the second section of the media transport device. Optionally, positioning the first cleaning substrate in the first section comprises securing the cleaning substrate within the first section by closing the section and causing the section to apply sufficient pressure to the cleaning substrate that the cleaning substrate is compressed and held by friction against interior components of the section. Optionally, positioning the first cleaning substrate in the section comprises positioning an opening of the first cleaning substrate over a media sensor of the media transport device. 
     In various additional embodiments, a method of cleaning a media travel pathway of a media transport device includes inserting a cleaning substrate into a section of a media transport device that includes a plurality of media conveyors, positioning the cleaning substrate in the section so that an opening of the cleaning substrate is positioned over a media sensor of the media transport device, and operating the media transport device so that the media conveyors move, contact the first cleaning substrate and are cleaned while the cleaning substrate remains substantially fixed within the first section of the media transport device. Before the inserting, the method may include opening the section of the media transport device to form a portal that is not accessible during operation of the media transport device, and placing the cleaning substrate in the section may include accessing the section through the portal. Optionally, after operating the media transport device, the method may include opening the section and removing the cleaning substrate from the section. Optionally, if the cleaning substrate is configured to have a plurality of alignment positions, positioning the cleaning substrate in the section may include positioning the cleaning substrate in a first one of the alignment positions; and after operating the media transport device the method may include opening the section, repositioning the cleaning substrate to a second position in the section according to a second one of the alignment positions, closing the section, and operating the media transport device again. Optionally, before operating the motor, the method may include opening a second section of the media transport device, positioning a second cleaning substrate in the second section without operating the motor, and closing the second section so that at least some media conveyors in the second section contact the second cleaning substrate. Operating the media transport device also may include causing the media conveyors in the second section to turn, contact the second cleaning substrate and be cleaned while the second cleaning substrate remains substantially fixed within the second section of the media transport device. Positioning the cleaning substrate in the section may include securing the cleaning substrate within the section by, closing the first section and causing the section to apply sufficient pressure to the cleaning substrate that the cleaning substrate is compressed and held by friction against interior components of the section. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  illustrates example components of a media transport system, such as may exist in a prior art automated teller machine or ticket taking machine, in block diagram format. 
         FIG. 1B  illustrates an example of an automated teller machine that includes the components shown in  FIG. 1A . 
         FIG. 2  illustrates a first example configuration of a cleaning substrate with scarifying holes and locking members. 
         FIG. 3  illustrates another example configuration of a cleaning substrate with scarifying holes and a locking member. 
         FIG. 4  illustrates a process by which a cleaning substrate may clean rollers of a media transport system. 
         FIG. 5  illustrates a process by which a cleaning substrate may clean a belt of a media transport system. 
         FIG. 6  illustrates another example configuration of a cleaning substrate, with flaps for use in cleaning a belt. 
         FIG. 7  illustrates how sensors may be used with a cleaning substrate. 
         FIG. 8  is a flow diagram illustrating a method of using a cleaning system of a type consistent with that shown by way of example in  FIGS. 2-7 . 
         FIG. 9  illustrates another example of a cleaning substrate, with a row of extended tabs for cleaning a set of rollers. 
         FIGS. 10A through 10C  illustrate a method of using the substrate of  FIG. 9 . 
     
    
    
     DETAILED DESCRIPTION 
     In this document, the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise. The term “comprising” means “including, but not limited to.” Similarly, the term “comprises” means “includes, and is not limited to.” Unless defined otherwise, all technical and scientific terms used in this document have the same meanings as commonly understood by one of ordinary skill in the art. 
     In this document, terms that are descriptive of position such as “upper” and “lower”, “horizontal”, “vertical” and the like are intended to indicate relative positions with respect to the components for which those terms are descriptive, and are not intended to be absolute and require that the component remain in that absolute position in all configurations. Except where specifically stated otherwise, numeric descriptors such as “first”, “second”, etc. are not intended to designate a particular order, sequence or position in an overall process or schema, but instead are simply intended to distinguish various items from each other by describing them as a first item, a second item, etc. 
     The terms “media transport system” and “media transport device” refer to a set of hardware components that are configured to receive printed media (i.e., a substrate onto which text and/or graphics have been printed) and move the printed media through one or more modules that perform various processing steps on the printed media, such as position adjustment, sensing, printing and/or delivery to a final destination. The media may include currency, admission tickets, or other documents. A “currency transport device” or “currency transport system” is a type of media transport device that is configured to process and convey printed financial instruments such as currency notes, checks, money orders, bank notes and the like. In this document the term “currency” is intended to include actual currency notes or bank notes, as well as other documents that are printed financial instruments such as checks and money orders. 
     In this document the terms “substantially fixed” and “substantially stationary” refer to objects that do not move through a travel pathway but remain within a single location in the travel pathway. An object may vibrate, flex or even wiggle or be jostled while remaining “substantially fixed” or “substantially stationary” so long as it is not moving through the media transport system to different positions within the travel pathway. The terms “substantially fixed” and “substantially stationary” therefore include, but are not limited to, completely fixed and stationary positions. 
       FIG. 1A  is a block diagram that illustrates example components of a media transport system, such as may exist in a prior art automated teller machine or ticket taking machine.  FIG. 1B  illustrates an example of an automated teller machine that includes the components shown in  FIG. 1A . The machine includes a housing  120  that contains the media transport system. As shown in  FIG. 1B , optionally the housing may include a door  121  and one or more extendible rails  122 , shuttles, or other movable mechanisms that may be used to remove at least part of the media transport system from the housing  120 . 
     The media transport system includes components such as a receiver  111  that includes belts, rollers or other conveying mechanisms that will receive printed media into the system via an opening in the housing. For media transport systems that are currency transport systems, the received  111  may be referred to as a currency acceptor. The media transport system also may include a separator module  112  that includes belts, rollers or other media conveyor devices that separate stacked printed media, such as stacked checks or currency notes. In currency transport systems, such rollers are sometimes referred to as “pick rollers” or “pick wheels.” The media transport system also may include an alignment module  113  that includes belts, rollers or other conveying mechanisms that will adjust a position of the media with respect to an internal reference point. The media transport system also may include an imaging system  114  with a camera and/or other sensors and associated programming that can detect what the media is and/or what is printed on the media. The media transport system also may include a transport module  115  with one or more belts, rollers or other media conveyors that will move the printed media to an appropriate destination  116  such as a shuttle, bin or exit port. The media transport system also may include other modules, such as a printer that can apply additional printed markings to the printed media. The areas within each module through which the printed media passes form a media travel pathway from the receiver&#39;s intake to the final destination. 
       FIG. 2  illustrates an example of a cleaning system that includes a cleaning substrate  201 , which sometimes may be referred to as a cleaning card, that may be used to clean various components of a media transport system such as that shown in  FIGS. 1A and 1B . The cleaning substrate includes a cleaning face  202  (which as shown is an upper face) and an opposing face (not shown, since it is under cleaning face  202 ) that may or may not also be a cleaning face. At least one of the cleaning faces may be coated with a cleaning solution such as a solvent so that internal components of the media transport system may be cleaned when the components move along or across the cleaning face of the substrate. Example cleaning solutions include isopropyl alcohol, deionized water, alkaline surfactants, and other materials or combinations of these. Alternatively, a cleaning face may be textured or made of fiber that will promote friction when a movable object is moved against the cleaning face. The cleaning substrate may be made of a flexible, tear-resistant material such as a fibrous aramid or meta-aramid fabric material such as that marketed under the NOMEX® brand; a cellulosic material; a flexible polymeric substrate provided with thin, non-woven layers made of absorbent material such as that marketed under the SONTARA® brand; a sponge made of polyurethane or other type of foam; or a combination of any of these, such as a sponge coated with a fabric, non-woven absorbent or cellulosic material. 
     The cleaning substrate also includes one or more locking members  203  such as holes, slots and/or tabs that are configured to align with (such as by fitting over or locking into) a stationary component of the media transport such as a post. Each locking member  203  is a structure that will hold the cleaning substrate  201  in place in a substantially fixed position within the media travel pathway while moving parts of the media transport system pass over or along the cleaning substrate and are cleaned. 
     In the example shown in  FIG. 2 , the locking members  203  may be tabs that extend away from the cleaning face  202  in a direction that is perpendicular to the path of travel of the media transport device. In the embodiment shown, each of the tabs may include a receptacle that is positioned to align with a post of the media transport device. If the media transport device includes multiple posts, or if the substrate includes multiple locking members  203  such as in the example shown in  FIG. 2 , the receptacles of the locking members  203  of  FIG. 2  may be placed over various posts so that the cleaning substrate can be used in multiple positions in the transport system. In an alternate example shown in  FIG. 3 , the cleaning substrate  301  may include a locking member  303  with multiple receptacles  304 ,  305 , each of which is positioned to align with a post of the media transport device (which may be a single post, or multiple posts) so that the cleaning substrate may be aligned in multiple positions within the media travel pathway of the media transport system. Another example of locking members will be discussed below in the context of  FIG. 9 . 
     Alternatively or in addition to a locking member, the cleaning substrate may be held substantially fixed by friction within the media travel pathway when the pathway is closed. This may happen, for example, if the cleaning substrate is at least at thick or thicker than the closed media travel pathway so that the cleaning substrate contacts interior components of the media travel pathway and is held against those components by friction. A cleaning substrate made of a compressible foam core and fabric or other abrasive cover may be useful in such an embodiment. 
     The cleaning substrate has a length and width that is sized and shaped to fit within the media travel pathway of the transport device with which the cleaning substrate is intended to be used, and the locking tabs will be positioned to connect to the posts or other connecting structures of the transport device with which the cleaning substrate is intended to be used. As used in this document, the term “fit within” does not necessarily mean that the substrate is entirely held within the media travel pathway, as a locking tab or other relatively small portion of the substrate may extend from the media travel pathway into other areas of the interior of the transport device. However, in some optional embodiments the cleaning substrate will be retained completely within the media travel pathway. In some optional embodiments, no portion of the substrate will extend from a media acceptor port (such as a currency acceptor slot) of the transport device. 
     In addition, referring to  FIG. 3 , the cleaning substrate will include multiple scarifying holes  312 ,  313  that are positioned to align over, under, or in between rollers of the media transport device. A scarifying hole is an opening created and positioned to provide a scraping edge against which another item may be scraped so that debris or other contaminants on the item&#39;s surface are scraped and thus removed via movement of the hole, the item or both. Referring to  FIG. 4 , the substrate  401  includes a scarifying hole  411  sized and positioned to fit between an idle roller  423  and drive roller  425  of the media transport system. In normal operation when the media transport system receives printed media, the drive roller  425  presses against the media, and a motor turns the drive roller  425  to move the media through the media travel pathway. The idle roller  423  is positioned proximate to the drive roller  425  to serve as a backstop for the force of the drive roller  425 . The printed media passes between the idle roller  423  and drive roller  425 . In a cleaning operation, the drive roller  425  is activated but the cleaning substrate remains stationary, anchored in the transport path by the locking structure(s). The scarifying hole  411  receives the idle roller  423  and/or the drive roller  425  so that one or both rollers scrape along the edges of the scarifying hole  411  and are thus cleaned. In configurations that only use a drive roller without an idle roller, the drive roller may be received into the scarifying hole. 
     The drive rollers and/or idle rollers of other drive roller  435 /idle roller  433  pairs that are not aligned with the scarifying hole  411  will be wiped by the cleaning substrate. Then, when the cleaning substrate is moved to a different stationary position in the media transport path (and a different locking member receptacle or media transport system post is used to lock the cleaning substrate in the different position) the other drive roller  435 /idle roller  433  pair may be aligned with the scarifying hole  411  or a different scarifying hole in the substrate. 
     Scarifying holes also may be sized and positioned to align with and accept one or more belts or other moving parts of the media travel pathway. For example, referring to  FIG. 5 , one or more axles  522 , when activated, turn a belt  525  while the cleaning substrate remains stationary in the media travel pathway. If the scarifying hole has a width that smaller than, or at least no greater than, the width of the belt  525 , the belt  525  will be scraped by the scarifying hole  511  and wiped by the cleaning substrate  501 . In addition, if the scarifying hole  511  is positioned to align with the axle  522 , the axle  522  may help push a segment of the belt  525  into the scarifying hole  511  to promote scraping of the belt  525  along the edge of the scarifying hole  511 . 
       FIG. 6  illustrates an alternative to  FIG. 5  in which, as an alternative to (or in addition to) a scarifying hole, a belt scraper is formed by one or more inwardly-facing flaps  618   a ,  618   b  that may be lifted upward or pressed downward so that the belt may be placed under or over each flap. Each flap  618   a ,  618   b  will have at least one side that is attached to the cleaning substrate and at least one edge that is formed by an angled or curved cut into the substrate so that the flap can be lifted or pressed and receive the belt. The edge may be a single curved edge as shown, or multiple angled edges may be used. As the belt is operated, the cut-away edge of the flap will scrape the belt. The face of the cleaning substrate also may wipe the belt. In addition, both sides of the belt may brush across the cleaning surface of the substrate and the flap as the belt passes over the substrate and under the flap (or over the flap and under the substrate). This may result in the deposit of dirt, oil or other contaminants  634  on the cleaning substrate, as shown in  FIG. 6 . Optionally, the flaps  618   a ,  618   b  may be adjacent to a scarifying hole  611 . In some embodiments, the flaps  618   a ,  618   b  may serve as locking members to hold the cleaning substrate in a substantially fixed position by contact with the belts during operation. The embodiment of  FIG. 6  also illustrates an embodiment with additional locking members  603  that are each an inwardly-facing slot into which a post of the media transport system may be placed. 
     Referring to  FIG. 7 , in some embodiments scarifying holes or other openings  711  of the cleaning substrate  701  also may be sized and positioned to align with one or more media sensors  722  within the media travel pathway. Such a sensor  722  may include a pressure sensor, an optical sensor, a temperature sensor, and/or any other sensor that is available in the media transport system and configured to detect placement of media (such as a cleaning card or currency) into the device and may, in some embodiments, include a transmitter  723   a  and receiver  723   b  as is shown in  FIG. 7 . The media transport device may use the sensor  722  to detect the position of the cleaning substrate  701  within the media travel pathway (e.g., based on pressure or optical data determine whether the sensor is over a scarifying hole). In addition, in some media transport systems one or more sensors  722  may be used to detect whether the device is jammed and media is not moving through the media travel pathway. If so, the placement of an opening  711  such a sensor can help avoid the media transport system stopping. The opening may be a hole in the cleaning substrate, or a transparent section of the cleaning substrate made of a clear material such as clear plastic, or a polyester film such as that sold under the MYLAR® brand. The sensor can detect whether or not the cleaning substrate is in a proper cleaning position, rather than mis-aligned or jammed, because if the opening  711  not been positioned under the sensor  722 , the sensor  722  would have detected the presence of the non-moving substrate and thus detected that the cleaning substrate is not moving through the device. 
     Referring back to  FIG. 2 , in some embodiments one or more of the scarifying holes  211  may include a scraper  217  that is attached to one or more edges of the scarifying hole. The scraper  217  extends inwardly toward the center of the scarifying hole  211 . Referring to  FIG. 4 , depending on whether the alignment of the scraper  417  is positioned closer to an upper face, closer to a lower face, or centrally within the scarifying hole, the scraper may provide additional scraping force against the idle roller  423  and/or the drive roller  425 . 
     Referring back to  FIG. 3 , in some embodiments the cleaning substrate  301  may include any number of forward-facing or reverse-facing flaps  327 , shown here as forward-facing flaps formed by cuts made into the cleaning substrate  301 , that are positioned along a forward-facing edge (i.e., facing the direction of media travel in the media travel pathway) of the cleaning substrate. The flap  327  can be sized and positioned to fit within a slot of the media transport device to help retard forward or reverse movement of the cleaning substrate  301  in the media travel pathway and further anchor the cleaning substrate  301  in a stationary position during the cleaning operation.  FIG. 6  illustrates another embodiment in which the forward-facing flap  627  is not on a leading edge of the substrate but instead is on a forward-facing edge of within an opening  628  within the cleaning substrate. The flap  627  also may, in some embodiments, serve as or be part of a locking member. 
     In various embodiments, a cleaning system may include multiple cleaning substrates that are sized, shaped, and which contain scarifying holes and locking structure to align within different modules of the media transport system. For example, a first cleaning substrate  201  such as that shown in  FIG. 2  may be placed within the alignment module of a media transport device while the device is idle, and a second cleaning substrate  301  such as that shown in  FIG. 3  may be placed within the receiving module of the media transport device while the device is idle. The media transport device may then be operated, and each of the modules will be cleaned at the same time. 
       FIG. 9  illustrates an additional embodiment of a cleaning substrate  901  that includes a set of locking members  923   a  . . .  923   n  that are tabs that extend downward (or upward) in a direction that is between about 45° and about 90° from the cleaning substrate, configured in row to be received by a set of rollers (such as picker rollers) in the media transport device. These tabs may have a thickness that, when uncompressed, is substantially equal to or larger than the thickness of a space between the rollers and their next adjacent component. Thus, in this embodiments the locking members  923   a  . . .  923   n  both hold the cleaning substrate in place and also serve to clean the rollers when the rollers are turned. In this embodiment and in other embodiments discussed above and below, the turning of the roller may be done manually, or by operation of a motor of the media transport device. 
     Optionally, cleaning substrate  901  may include a second face  905  with additional locking members  903   a ,  903   b  that extend away from the sides the cleaning substrate in a direction that is perpendicular to the direction of media travel in the media travel pathway. These side-extended locking members  903   a ,  903   b  may include openings that will fit over posts or other extended elements that are not in the media pathway. Alternatively, the side-extended locking members  903   a ,  903   b  may include no receptacle but have a thickness (when not compressed) that is thicker than that of the media travel pathway when closed so that the locking members will be held by the media transport device by friction when the device is closed. The second face  905  of the substrate may serve as a handle to hold and place the substrate into the media travel pathway. 
     As shown in  FIG. 9 , when manufactured the cleaning substrate  901  may be substantially flat, and locking members be formed as locking tabs  923   a  . . .  923   n  cut into a first cleaning face  904  of the substrate  901 . 
       FIGS. 10A through 10C  shows a method of using the cleaning substrate of  FIG. 9 .  FIG. 10A  shows that when placed into the media travel pathway of the media transport device  950 , the cleaning substrate may be folded so that the locking tabs  923   a  . . .  923   n  extend downward (or alternatively upward) from the first and second faces  904 ,  905  in a row. As shown in the close-up of  FIG. 10B  the locking tabs  923   a  . . .  923   n  will be received by corresponding rollers  951   a  . . .  951   n  of the media travel pathway. After the locking tabs  923   a  . . .  923   n  are placed against their corresponding rollers  951   a  . . .  951   n , the cleaning faces  904 ,  905  may be folded down onto the media travel pathway. Locking members  903   a ,  903   b  may be placed over posts or other receivers of the pathway. Optionally, the cleaning substrate  901  may include one or more fold lines  920 , formed by score lines or crease lines in the substrate, to assist in and help enable folding and positioning the substrate in place in the media travel pathway. 
       FIG. 9  also shows that the cleaning substrate  901  optionally may include scarifying holes  911   a  . . .  911   n  that are configured to be placed between pairs of drive and idle rollers inside of the media transport device. The scarifying holes  911   a  . . .  911   n  may be positioned forward of the locking tabs  923   a  . . .  923   n  in the media pathway (i.e., toward a front end of the card that faces the path of travel in the media travel pathway), or in the opposite direction (i.e., toward a rear end of the card that faces away from the path of travel). The scarifying holes  911   a  . . .  911   n  may be positioned in a first row across the face of the cleaning substrate  901  while the locking tabs  923   a  . . .  923   n  may be positioned in a second row across the face of the cleaning substrate  901 . Although not shown in  FIG. 9 or 10A-10C , the cleaning substrate  901  also may include one or more openings (holes or clear material) that are positioned to fit over a media sensor of the media transport device. Any cleaning face of the cleaning substrate  901  also may include or be coated or treated with a cleaning solution. 
     In some embodiments, in any of the embodiments described above the cleaning face(s) of the cleaning substrate may be textured to provide additional cleaning function (e.g., by applying friction to belts that pass over the cleaning substrate). The cleaning face(s) also may include a material such as a meshed loop structure that entangles dirt to trap it. 
       FIG. 8  illustrates a method of using a cleaning system such as that described above. The method includes opening the media transport device to form a portal into which a first cleaning substrate may be placed (step  801 ). The portal will be a portal that is not accessible during normal operation of the device. For example, the portal will not be a currency acceptor slot that is used during normal operation to insert currency into the media transport device. Instead, the portal will be formed by opening one or more of the modules that form the media travel pathway. The cleaning substrate will be inserted into a media travel pathway of the media transport device through the portal, and the cleaning substrate will be placed into a fixed position without operating the motor that actuates the media conveyors (i.e., belts and/or rollers) of the media transport device (step  802 ). 
     In some embodiments, the media transport device may detect that a cleaning substrate has been placed into the media travel pathway, and if so it may automatically change its mode of operation to a cleaning mode rather than a normal operating mode. The cleaning mode may differ from the normal mode in that, for example, it may hold the cleaning substrate in a particular location for a defined period of time before moving the substrate to a next section, or it may adjust the pressure applied to the substrate, or it may override a “device jam” alert and permit the media conveyors to turn even though the cleaning substrate is not moving through the machine in a normal mode of operation. Detection that the substrate is a cleaning substrate may occur by any suitable means, such as by manual input, by detecting a shape of the substrate, or by using image processing to detect a code or other identifying indicia that is printed on the substrate. 
     If the cleaning substrate includes scarifying holes, the scarifying holes may be aligned to rollers, belts, sensors and/or other selected components of the media transport device that are in the media travel pathway. If the cleaning substrate includes one more flaps for cleaning a belt, one or more belts may be positioned over or under the flap(s). If the cleaning substrate includes one or more locking members, the locking member(s) may be aligned with post(s), roller(s) or other components that will hold the locking members while the cleaning substrate is within the media travel pathway. If the cleaning substrate includes a latching flap, the latching flap may be placed within a slot in the media travel pathway. 
     A first section of the media transport device will thus receive the cleaning substrate through the portal. The cleaning substrate may remain fully within the media travel pathway. Alternatively, a portion of the cleaning substrate may extend out from the media travel pathway, such as through a currency acceptor slot, so long as enough of the cleaning substrate remains within the pathway to provide a cleaning function. 
     Optionally, one or more additional cleaning substrates may be placed into additional sections of the media travel pathway of the media transport device (step  803 ) as described above. 
     The portal to the first section will then be closed (step  804 ) so that at least some of the belts or rollers contact the first cleaning substrate. The media transport device will then be operated so that a motor of the device causes the belts or rollers to move, contact the first cleaning substrate and be cleaned while the first cleaning substrate remains substantially fixed within the first section of the media transport device (step  805 ). In some situations, operation of the media transport device may be manual operation of the belts or rollers (e.g., manually turning them). After operation, the device may then be turned off (e.g., powered down or moved to an idle mode in which the belts and rollers of the media travel pathway are not operated), and portal(s) will be opened to remove the cleaning substrate(s) from the media travel pathway (step  807 ). 
     Optionally, before opening the first section and placing the cleaning substrate through the portal, the method may include operating the media transport device and, while operating the motor, placing a second cleaning substrate (step  810 ) that includes a cleaning solution into a second portal that is accessible during operation of the motor so that the second cleaning card is received into, and moves through the media transport device, and the cleaning solution contacts the belts or rollers while the second cleaning substrate moves through the media transport device. In this way, cleaning solution may be applied to the media travel pathway before the stationary card is inserted, and the stationary card may then require little or no cleaning solution. This also may help pre-clean the components of the media travel pathway before the stationary cleaning substrates are inserted. 
     Optionally, after operating the media transport device so that the belts or rollers turn, contact the first cleaning substrate and are cleaned (step  805 ), the method may include opening the portal to expose access to a section of media travel pathway and repositioning the cleaning substrate to a second position in the section according to a second alignment positions (step  806 ). That portal may then be closed, and the media transport device will be again operated so that at least some of the belts or rollers turn, contact the cleaning substrate and are further cleaned while the cleaning substrate remains substantially fixed in the second position. 
     The methods and systems described above may result in significant time savings as compared to manual cleaning. In addition, they can help ensure that cleaning occurs in small and/or hard-to-reach segments within the media transport device. 
     The features and functions described above, as well as alternatives, may be combined into many other different systems or applications. Various alternatives, modifications, variations or improvements may be made by those skilled in the art, each of which is also intended to be encompassed by the disclosed embodiments.