Patent Publication Number: US-2021174627-A1

Title: Methods to Reduce Jamming in a Drum Style Bill Handler and Recycler

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a nonprovisional of and claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Patent Application No. 62/946,170, filed Dec. 10, 2019, the contents of which are incorporated herein by reference. 
    
    
     FIELD 
     The present disclosure generally relates to currency handling devices that both accept and dispense bank notes or bills to users. Such currency handling devices may involve the receipt, movement, storage, and dispensing of the bank notes. Devices, systems, and methods are presented herein for configuration and operation of such currency handling devices to reduce jamming of bills during movement. 
     BACKGROUND 
     Many business establishments, such as casinos, provide currency handling devices or machines for the convenience of their customers. Such currency handling devices may accept and/or dispense bank notes (herein also “bills” or “currency”). The currency handling devices may also accept and/or dispense other types of documents, such as casino gaming tickets, coupons, personal checks, and the like. The currency handling devices may also provide other services as well, such as electronic funds transfers within, or between, financial institutions. 
     Some currency handling devices may store bills, such as those received from a user, in a section for return or disbursement, such as to a later user. Currency handling devices with such storage and return capability may be provided by gaming establishments, such as casinos, that have high currency usage and turnover. A storage and return capability may reduce a need to empty or reload bills, as would be the case for a currency handling device in which received bills were only stored in a first section until removed, and dispensed bills were separately provided from a second section. However, many currency handling devices capable of storing and subsequent dispensing of bills may have mechanical paths or slots along which the bills are received, and dispensed and, often, such paths become jammed or clogged during bill movement. 
     SUMMARY 
     This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
     Disclosed herein are currency handling devices (or “currency handling machines”), systems including currency handling devices, and methods for their operation. The currency handling devices described herein make use of bank note recycling, in which received bank notes, such as may be received from a user, are stored and subsequently dispensed or issued to the same or a different user. 
     More specifically, methods of operating currency handling devices are described for currency handling devices that include a bill recycler, a bill storage area, and an escrow section. The methods include the operations of: moving a bill from the bill recycler to the escrow section; determining whether the bill is to be moved to the bill storage area; moving the bill from the escrow section to the bill storage area in the case that it is determined that the bill is to be moved to the bill storage area; and moving the bill from the escrow section to the bill recycler in the case that it is determined that the bill is not to be moved to the bill storage area. 
     In additional and/or alternative embodiments, the methods include iterating these operations for multiple bills stored on the bill recycler. Signals to initiate the operations may be operator-applied, periodically applied, or automatically generated. 
     Also described herein is a currency handling device that includes: a bank note acceptor; a bill recycler with at least one storage and recycling (S/R) drum; an escrow section with an escrow storage drum; and a bill storage area. The currency handling device is operable to perform a set of operations that: move the bank note from the bill recycler to the escrow section; determine whether the bank note is to be moved to the bill storage area; move the bank note from the escrow section to the bill storage area in the case that it is determined that the bank note is to be moved to the bill storage area; and move the bank note from the escrow section to the bill recycler in the case that it is determined that the bank note is not to be moved to the bill storage area. The currency handling device may be operable to dispense bank notes from the bill recycler. The currency handling device may include a bill validator to determine to which of the bill recycler and the bill storage area the bank note is to be routed. 
     In additional and/or alternative embodiments, the currency handling devices include a control unit operably linked with the bill recycler and the escrow section, and operable to coordinate the performance of the set of operations. The control unit may be connected to an external control center. The currency handling devices may include a sensor to detect an environmental condition within the currency handling device. The detected environmental conditions may be used, either by an operator or automatically by the control unit, to adjust the timing or initiation of the bank note recycling methods. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements. 
         FIG. 1A  illustrates components of a currency handling device that includes a drum style bank note recycler. 
         FIG. 1B  illustrates side views of deformations that may occur to a bank note stored on a drum style bank note recycler. 
         FIG. 2A  illustrates a first example configuration of components of a currency handling device. 
         FIG. 2B  illustrates a second example configuration of components of a currency handling device. 
         FIG. 3  illustrates a block diagram of components of a currency handling device. 
         FIG. 4  shows a flow chart of a method of operating a currency handling device. 
         FIG. 5  illustrates a signal flow chart of a method for issuing a command to move bank notes in a currency handling device. 
         FIGS. 6A-6C  illustrate a sequence of movements of bank notes in a currency handling device. 
         FIG. 7  illustrates a sequence of movements of a bank note in a currency handling device. 
     
    
    
     The use of cross-hatching or shading in the accompanying figures is generally provided to clarify the boundaries between adjacent elements and also to facilitate legibility of the figures. Accordingly, neither the presence nor the absence of cross-hatching or shading conveys or indicates any preference or requirement for particular materials, material properties, element proportions, element dimensions, commonalities of similarly illustrated elements, or any other characteristic, attribute, or property for any element illustrated in the accompanying figures. 
     Additionally, it should be understood that the proportions and dimensions (either relative or absolute) of the various features and elements (and collections and groupings thereof) and the boundaries, separations, and positional relationships presented there between, are provided in the accompanying figures merely to facilitate an understanding of the various embodiments described herein and, accordingly, may not necessarily be presented or illustrated to scale, and are not intended to indicate any preference or requirement for an illustrated embodiment to the exclusion of embodiments described with reference thereto. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to representative embodiments illustrated in the accompanying drawings. It should be understood that the following descriptions are not intended to limit the embodiments to one preferred embodiment. To the contrary, it is intended to cover alternatives, modifications, and equivalents as can be included within the spirit and scope of the described embodiments as defined by the appended claims. 
     The embodiments described herein are directed to currency handling devices that accept (take in) bank notes or bills, or other types of documents, and store at least some for return to users. Examples of such other types of documents include, but are not limited to, casino gaming tickets, coupons, and personal checks. By storing, at least temporarily, some received bills or documents, there may be less need to reload the currency handling device, such as with bills, for dispensing to users. The currency handling devices may be part of, or also include, a printing device operable to dispense documents, such as casino gaming tickets, coupons, and personal checks. 
     As an example, such a currency handling device may also accept credit, bank cards, or debit cards, coins, or other forms of payment, and may be equipped to execute transfers of money from a user&#39;s financial account (e.g., bank account, credit account, and so on). The currency handling device may then dispense an entered amount from the stored bills. In another example, such a currency handling device may be located in a gaming establishment, such as a casino. The currency handling device may be equipped to accept bills from a user and issue a gaming ticket (e.g., a printed object with a code readable by the casino&#39;s gaming machines) for use by the user. Further, the currency handling device may accept the bills and credit the amount to a financial account of the user. Alternatively, such a currency handling device may accept the gaming ticket and refund its associated value, or a portion thereof, by dispensing bills in one or more currencies. 
     In locations in which a currency handling device may be expected to be frequently accessed by users, such as casinos, recycling bills by accepting them as inputs and storing them for later dispensing back to users can reduce the number of times that it needs to have bills reloaded. 
     A currency handling device configured for such bill recycling may store bills by rolling or wrapping the inserted bills sequentially as they are received around a circumference of an internal storage and recycling (“SIR”) drum. As an example, the S/R drum may be a cylinder around which the bills are wrapped, analogous to paper towels wrapped around a tube. 
     When a bill is later needed for dispensing to a user, the outermost stored bill on an S/R drum can be unwrapped and ejected. Such a currency handling device may have multiple bill recycler sections, each with one or more such S/R drums. The multiple S/R drums in the bill recycler sections may allow for storage of separate denominations on separate S/R drums, to have back up S/R drums for the same denomination, or for other uses. 
     Bills that are wrapped around an S/R drum may, such as when left on the drum for an extended period of time, become deformed in various ways. For example, the bills can take the shape, if only partially, of the curvature of the S/R drum. This may increase the likelihood that such a bill would jam in an ejection conveyor subsystem of the currency handling device. Environmental factors, such as humidity and/or temperature, may contribute to an increased likelihood that a bill would jam. For example, increased temperature, or low humidity, may reduce a pliability of a bill. 
     The embodiments disclosed herein are directed to currency handling devices configured to reduce such a risk of jamming, and methods of their operation. The embodiments make use of an extra storage area, referred to herein as an escrow section, to which bills may be temporarily moved from an S/R drum. The bills so removed from an S/R drum may be selected to be sent either back from the escrow section to the S/R drum for storage and dispensing, or to a permanent storage area that does not dispense the bills. The selection may be based on scans or other tests of the bills, and may use a variety of criteria, such as lack of wear, recorded time a bill has been on an S/R drum, and environmental factors. The selection may be performed either as the bills are removed from the S/R drum, or as the bills are removed from the escrow section. 
     Such bill recycling methods of moving bills off an S/R drum to the escrow section, sorting, and restoring selected bills to the S/R drum may be implemented in various ways. The bill recycling method may be performed when a manually entered command is received, at programmed time intervals, and/or automatically based on observed factors (such as humidity or temperature, material of the bill, recorded times bills have been on the S/R drum, and so on) that can influence deformation of a bill on an S/R drum. These and other ways will be described in more detail below. 
     Bills removed from an S/R drum to the escrow section during a bill recycling operation may be temporarily stored around an escrow section drum, and may also be wrapped with an opposite curvature around the escrow section drum. This may reduce any curvature imparted to the bill while it was stored on the S/R drum. Alternatively, bills moved to the escrow section may be temporarily stored flat, and may then be returned to the S/R drum using a first-in, first-out (FIFO) mechanism. This may reduce chances that a bill is stored for too much time as an innermost bill wrapped on the S/R drum. 
     These and other embodiments are discussed below with reference to  FIGS. 1A-7 . However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these Figures is for explanatory purposes only and should not be construed as limiting. Other examples and implementations are within the scope and spirit of the disclosure and appended claims. For example, features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations. Also, as used herein, including in the claims, “or” as used in a list of items prefaced by “at least one of” indicates a disjunctive list such that, for example, a list of “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Further, the terms “example” or “exemplary” do not mean that the described example is preferred or better than other examples. 
       FIG. 1A  illustrates components of a currency handling device  100 . In general, a currency handling device may include at least the following three sections: a bill or bank note acceptor  110  (or just “bill acceptor”), a bill recycler  120 , and a bill storage area  130 . The particular arrangement of these sections shown in  FIG. 1A , and likewise for other arrangements shown in this disclosure, is only for descriptive purposes, and does not imply a necessary physical arrangement. The currency handling device  100  shown in  FIG. 1A  is a simplification shown for ease of discussion of those three sections. Further, though shown as separate block components for ease of description, it is to be understood that these sections, and their internal components or parts as to be described, may be combined or formed as single units. For example, the bank note acceptor  110  and the bill recycler  120  may be a single module. 
     The bank note acceptor  110  receives bank notes (“bills” or “currency”) inserted by a user into the bill receiving components  102   a,    102   b,  that form a slot or inlet. At least one of the bill receiving components  102   a,    102   b  may have a display (e.g., alphanumeric) or other signaling components (such as LED lights) to indicate a status of the bank note acceptor, or one or more messages related to an inserted bill. The bottom bill receiving component  102   b  may form a tray, and may have other functional components. An inserted bill may be guided and/or moved into the interior of the bank note acceptor  110  by rollers  104   a,    104   b  along the channel  106 . Though only two rollers are labeled, the bank note acceptor  110  may have more or fewer rollers, or other configurations and/or alternative components, for moving a bill into the bank note acceptor  110 . 
     The bank note acceptor  110  may include bill validating components, such as the bill scanner  105 , to determine characteristics of an inserted bill. Such characteristics include, but are not limited to, authenticity status, denomination, value, country of origin, and wear status. If a bill is validated, it can be further processed, such as by being moved to the bill recycler  120  or the bill storage area  130 . If a bill is found not valid or unacceptable, such as by wear that makes its characteristics indeterminate, it can be returned. If an inserted is bill is determined to be counterfeit, it can be moved to a containment area (not shown) within the currency handling device  100 , and a message can be sent to an operator. 
     After an inserted bill is validated, a selection process may be used to determine to which of the bill recycler  120  or the bill storage area  130  it should be sent. The selection may be made based on a variety of criteria that may include, but are not limited to, the number of bills already in the bill recycler  120 , the wear of the bill, the denomination of the bill, and the number of bills in the bill storage area  130 . Once the selection process determines where to send the bill, the bill may be moved or routed either through channel  108   a  to be stored into the bill recycler  120  or through the channel  108   b  into the bill storage area  130 . In some embodiments, the bank note acceptor  110  may include a mechanical switch (not shown) to guide the bill into the correct channel. 
     The bank note acceptor  110 , or another component of the currency handling device  100 , may have other inputs (not shown) in addition to the slot formed by the bill receiving components  102   a  and  102   b.  Examples of such other inputs include card readers that accept credit or debit cards configured to read identification chips or magnetic strips thereon. Still other examples include optical or visual sensors or code readers, such as bar code or QR code readers. Still other input mechanisms for receiving inputs, whether as inserts or as communications from users, may be included in the currency handling device  100 . Additionally and/or alternatively, the input of the bank note acceptor  110  formed by the bill receiving components  102   a  and  102   b  may itself be operable for accepting other inputs, such as credit or debit cards, in addition to bank notes. 
     The second section shown, the bill recycler  120 , is configured to store received bills, and may also be operable to dispense stored bills to users. In the example configuration shown, the bank note acceptor  110  can move a bill into the bill recycler  120  through the channel  108   a.  Though the bill recycler  120  is shown as below the bank note acceptor  110 , it may be located beside, above, or in another position relative to the bank note acceptor  110 . 
     The bill recycler  120  may include an S/R drum  122 . A first bill being moved along the channel  108   a  may be wrapped around the S/R drum  122  as the S/R drum  122  rotates. Further bills subsequently being moved along the channel  108   a  may then also be wrapped onto the S/R drum  122 , and be wrapped outermost from, and perhaps atop, the first bill. Multiple bills may thus be sequentially stored onto the S/R drum  122 . The bill recycler  120  may use mechanisms to ensure that multiple bills become wrapped approximately evenly around the S/R drum  122 . For example, leading ends of a bill being wrapped onto the S/R drum may be sequentially spaced by a fixed angular separation. 
     The bill recycler  120  may be configured to dispense bills from the S/R drum  122  through the channel  124 , such as to a user. An exterior bezel or tray  126  may be positioned to receive the dispensed bill. Various mechanisms, as known to one skilled in the art, may be used to uncoil and/or remove the outermost bill wrapped on the S/R drum  122 , and move it into the channel  124  for dispensing. 
     The bill recycler  120  may be equipped with counters and/or sensors to determine how many bills are stored on the S/R drum  122 . As an example, the bill recycler  120  may have optical sensors detecting a thickness of all the bills wrapped on the S/R drum  122 . Additionally and/or alternatively, the currency handling device  100  may have a control or processing unit that records both the number of bills received and stored onto the S/R drum  122  and the number of bills dispensed in order to maintain a count of the net number of bills stored on the S/R drum  122 . 
     The currency handling device  100  may have a bill storage area  130  in addition to the bill recycler  120 . The currency handling device  100  may have control or processing units that determine if an input bill is to be moved to the bill recycler  120  or the bill storage area  130 . An input bill may be moved to the bill storage area  130  for any of various reasons, including the S/R drum  122  of the bill recycler  120  is at or near capacity, the bill is valid but not in acceptable condition for storing on the S/R drum  122 , and other reasons. 
     Bills may be moved along a channel  108   b  into the bill storage area  130 . The bill storage area  130  may store such bills in any of a variety of configurations, such as in a flat stack  132 , loosely in a removable sack, or in another configuration. 
     The currency handling device  100  may have various locking mechanisms to ensure only authorized operators may remove the bills either from the bill recycler  120  or the bill storage area  130 , or open any section for maintenance. 
     As mentioned, the currency handling device  100  is a simplified version presented for purposes of explanation and discussion. Other versions of a currency handling device may include multiple bill recycler sections, any of which may have multiple S/R drums for storing and dispensing bills. There may be one S/R drum for each denomination of bank note. 
       FIG. 1B  shows side views of deformations of bills that may occur, such as from being stored too long on a storage drum of a drum recycler, such as on the S/R drum  122  of bill recycler  120 . It may happen that a bill stored on the S/R drum  122  may have its substrate material deform to the first curled configuration  150  from an initial and/or preferred flat form. Various denominations of bills of various countries may use different substrate materials. Examples include, but are not limited to, cotton, flax, linen, and paper. When so deformed, the bill may be more likely to catch or jam in a channel, or in another location, as it is being removed from the S/R drum for dispensing. 
     Other forms of deformation of a bill are also possible. A second curled configuration  152  may occur when the bill&#39;s substrate has a first part deformed with a curl in a first direction, and a second part with a curl formed in the opposite direction. The second curled configuration may be produced, for example, by different speeds of movement of the bill over rollers in movement channels. Another deformation pattern of a bill that can lead to jamming is the “egged” deformation  154 . A bill may have another deformation pattern. Any deformation of a bill has the potential to cause it to jam during a movement operation. 
       FIG. 2A  illustrates an example configuration of a currency handling device  200   a.  The currency handling device  200   a  includes a bank note acceptor  210  configured to accept bank notes or other inputs from users. The bank note acceptor  210  may have any combination of features as described for the bank note acceptor  110 . 
     The currency handling device  200   a  includes two bill recyclers  220   a  and  220   b  configured to receive bank notes passed from the bank note acceptor  210 . The bill recycler  220   a  is shown with two S/R drums,  222   a  and  222   b,  and the bill recycler  220   b  is shown with two S/R drums  224   a  and  224   b.  Each of the S/R drums may be configured to a particular denomination of bill, such as $1.00 bills on S/R drum  222   a,  $5.00 bills on S/R drum  222   b,  $10.00 bills on S/R drum  224   a,  and so on Various channels and switching mechanisms (not shown) may be included in the bill recyclers  220   a  and  220   b  to route the bills to the appropriate S/R drum. The bill recycler  220   a  may also have channels (not shown) by which bills on the S/R drums  222   a,    222   b  may be returned externally to a user, such as by ejection through the bill receiving components  102   a  and  102   b  of the bank note acceptor  210 , or an opening separate from the bank note acceptor  210 . The same components may also be included in the bill recycler  220   b.  One skilled in the art will recognize that in other embodiments a currency handling device may have more or fewer bill recyclers, each of which may include more or fewer than two S/R drums. 
     The currency handling device  200   a  includes a bill storage area  230 . The bill storage area  230  may be configured to receive bills from the bank note acceptor  210  that are deemed (such as by a bill reader or scanner, such as bill scanner  105 ) unacceptable for storage on an S/R drum. Examples of criteria by which a bill or bank note would be deemed unacceptable include tears, state of wear, a denomination too large to risk jamming on a return or dispensing, a valid but foreign currency bank note, or other criteria. The bill storage area  230  may store the bills in a stack  232 , loosely (such as in a secure bag), or in another way. The currency handling device  200   a  may include more than one bill storage area  230 . 
     The currency handling device  200   a  includes an escrow section  240  configured to receive bills from the bill recyclers, as will be explained further below. The escrow section  240  shown includes two escrow storage drums  242  and  243  around which bills from the bill recyclers  220   a  and  220   b  can be stored. In other embodiments, the escrow section  240  may have one or more than two escrow storage drums. 
     Additionally and/or alternatively, the escrow section  240  may also have an alternative bill storage component  244  on which bills from the bill recyclers  220   a  and  220   b  may be stored in a flat stack. The alternative bill storage component  244  may use a first-in, first-out storage process. For example, bills from the S/R drum could be added to the top of a stack of bills on the alternative bill storage component  244 , and removed from the bottom. In this way, the order in which the bills were stored on the S/R drum would be returned to the S/R drum in reverse order. This may serve to reduce the likelihood that bills remain on the S/R drum for too long. 
     During the methods described below for moving bills from the bill recyclers  220   a  and  220   b  to the escrow section  240 , only some bills may need to be moved, so that either or both of the escrow storage drums  242  and  243  or the alternative bill storage component  244  may be configured to store fewer bills than the S/R drums  222   a/b  and  224   a/b.  The escrow section  240  may contain more or fewer than two escrow storage drums, and may contain multiple alternative bill storage components. 
       FIG. 2B  illustrates a currency handling device  200   b  having an alternate configuration of sections than the configuration of currency handling device  200   a.  The currency handling device  200   b  similarly includes a bank note acceptor  210 , two bill recyclers  220   a  and  220   b,  bill storage area  230 , and an escrow section  240 . In the configuration shown, the escrow section  240  has a single escrow storage drum  242  and a single alternate bill storage component  244 . Each of these sections may be as described previously, or may have more or fewer components based on the alternate configuration. 
     Depending on the size (e.g., vertical height) of the two bill recyclers  220   a  and  220   b  and the bill storage area  230 , and the height of a base on which the entire currency handling device  200   b  is mounted, it may be ergonomically advantageous to position the bank note acceptor in front of the top bill recycler  220   a  to be conveniently positioned for users. This may be possible in embodiments in which the various sections are separable units having various ways of being combined. The shown configuration of currency handling device  200   b  may also allow two bill recyclers  220   a  and  220   b,  the bill storage area  230 , and the escrow section  240  to be positioned on one side of a secure wall, with only the bank note acceptor  210  extending through the secure wall to be user accessible. 
     As previously described, the bank note acceptor  210  may be configured to accept, and perhaps also validate, bills inserted by a user, and route the bills (as shown by the dotted arrows) to either an appropriate S/R drum of either bill recycler  220   a  or  220   b,  or to the bill storage area  230 . As described below, the escrow section  240  may be configured to receive bills from the bill recyclers  220   a  and  220   b,  and then restore some or all of the bills. 
       FIG. 3  shows a functional block diagram of sections and components of one embodiment of a currency handling device  300 . Other embodiments may have alternate configurations, and more or fewer sections and components. The currency handling device  300  has at least one bank note acceptor  302  operable to take in bills. The bank note acceptor  302  may also perform other intake or ejection operations. These include, but are not limited to, accepting credit or debit card payments, accepting other inputs (such as casino floor gaming tickets), dispensing bills, and dispensing printed receipts. The bank note acceptor  302  may be configured to validate bank notes and determine how valid bills are to be stored. The bank note acceptor  302  may be configured to pass bills (as indicated by the two solid lines) to one of the bill recyclers  304  or the bill storage area  306 . The selection of where to pass bills may be made as described above in relation to the bank note acceptor  110 , or by using additional and/or alternative criteria. In some embodiments, the bank note acceptor  302  may also be configured to eject bills received from the bill recyclers  304 . 
     The currency handling device  300  may have one or more bill recyclers  304 . As described previously, the bill recyclers may each have one or more S/R drums, which may be cylinders around which accepted bills can be wound for storage and possible subsequent dispensing. The currency handling device  300  may also have one or more bill storage areas  306 . The bill storage area  306  may receive bills either from the bank note acceptor  302 , any of the bill recyclers  304 , or from an escrow section  308  (or “bill escrow”). The escrow section  308  may be configured to accept bills from any of the bill recyclers  304 , and return some or all of the bills to the bill recyclers  304 , or to the bill storage area  306 , as part of the methods described previously, and below. 
     The currency handling device  300  may have a control unit  310  that may have communication links, as indicated by the dotted lines, with some or all of the various components and sections of the currency handling device  300 . The control unit  310  may include one or more processors, microprocessors, microcontrollers, image processors, application specific integrated circuits, memories, interfaces, and other components as needed to interact with and control operations of the various components and sections of the currency handling device  300 . 
     As an example, the control unit  310  may receive signals from the bank note acceptor  302  related to scans of an inserted bank note. Such a scan may be obtained from the bill scanner  105 . The control unit may use various image processing algorithms to determine if the bill is a valid bank note. If the bill is not valid, the control unit may transmit one or more signals to the bank note acceptor  302  to cause the bill to be ejected, such as by reversing the direction of rotation of rollers  104   a,    104   b  as in the currency handling device  100  described above. 
     The control unit  310  may additionally and/or alternatively control other operations of the bank note acceptor  302 , such as causing a message to appear on a display screen, causing valid accepted bills to be routed to either the bill recyclers  304  or the bill storage area  306 , and other operations. 
     The control unit  310  may have communication links to send and receive signals with the bill recyclers  304 . As an example, the signals may be related to the number of bills on the various S/R drums of the bill recyclers  304 . The control unit  310  may also receive signals related to a user input, as may have been entered on a touchpad or keypad of the bank note acceptor  302 , and as a result send signals to cause one or more of the bill recyclers  304  to dispense bills to the user. The control unit  310  may also maintain, such as in an internal memory, a record of the number of bills on the S/R drums of the bill recyclers  304 , and the time such bills have been stored. 
     The control unit  310  may also have a communication link with the bill storage area  306 , such as to receive signals related to how full the bill storage area is. The control unit  310  may also have a communication link with the escrow section  308 , such as to control movement of bills from and to the bill recyclers  304  during operation of the methods described below. 
     The control unit  310  may have an external communication link  314 , such as to a separate control or data center, to accept either automated or manual entry of operations to be performed by the currency handling device  300 . The external communication link  314  may be any of various technologies, including, but not limited to, Ethernet, cable technologies, wired links, fiber optic technologies, and radio transmission technologies (such as WiFi, cellular, or near field communication methods). The control unit  310  may also use the external communication link  314  to transmit messages, such as regarding the status of the currency handling device  300  or its components or sections. For example, messages may be sent related to operational status (e.g., jammed or in service), number of bills on the various S/R drums of the bill recyclers  304  or in the bill storage area  306 , among other types of messages. 
     The currency handling device  300  may also include one or more sensors  312 . Some or all of the sensors  312  may be components of the other sections of the currency handling device  300 , such as internal to a bill recycler  304 . The sensors may detect environmental parameters, such as humidity and/or temperature, or physical properties, such as vibration, weight (such as of the bill storage area), or yet other properties. The one or more sensors may have a communication link with the control unit  310  over which the respective sensed parameter or property can be transmitted. The control unit  310  may receive the sensors&#39; signals and may modify operation of the currency handling device  300  or its components or sections based on the sensor data contained in the signals. For example, a record of low humidity may indicate that the bills on the S/R drums of the bill recyclers may be at risk of becoming drier and stiffer sooner than expected, and so trigger the bill recycling methods described below. Similarly, a record of higher than expected temperature may also make the bills drier sooner than expected. Also, a record that the S/R drum has had a greater than expected number of bills stored for a certain time interval may imply that the innermost bills have been subjected to greater than expected deforming pressure. These further examples may also trigger the bill recycling methods described below. 
       FIG. 4  shows a flow chart of a method  400  for bill recycling that may be used as part of the operations of any of the currency handling devices described herein having an escrow section and a bill recycler. The method may be controlled by a control unit of the currency handling device, such as control unit  310  described previously. 
     At stage  402 , the method  400  is initiated when the bill recycler receives a command to initiate bill recycling and begin moving bills from an S/R drum to the escrow section. The command may arise in any of the ways described below in relation to  FIG. 5 . The command may be received at the currency handling device from an external source, or may be generated by a control unit of the currency handling device, such as control unit  310  as described previously. The command may also specify which S/R drum and bill recycler is to undergo the bill recycling method  400 . 
     At stage  404 , an outermost bill stored on the specified S/R drum is removed from the S/R drum. At stage  406 , the bill is evaluated to determine where it should eventually be placed. Either the specified bill recycler or the escrow section may include a bill scanner, such as bill scanner  105  described previously, or another detection component operable to determine the wear or deformation status of the bill. Additionally and/or alternatively, in some embodiments a control unit (either in the currency handling device or in a separate control system) may determine the status based on at least one of: a record of initial wear or deformation status determined at the bill&#39;s input; a record of environmental factors within the currency handling device or bill recycler; a record of the length of time the bill has been on the S/R drum; or other factors. 
     At stage  406 , the bill is selected either for movement to the storage area, or for temporary storage in the escrow section. In the former case, at stage  408  the bill is moved into the storage area. In the latter case, at stage  410  the bill is moved into the escrow section. 
     At stage  412 , the method  400  determines if more bills are to be removed from the bill recycler. In one case, a negative answer (i.e., that no more bills are to be removed) may occur if the S/R drum has been emptied of bills. In other cases, a negative answer may occur even if bills still remain on the S/R drum, but the control unit needs to interrupt the process. This may occur if the escrow section is full, if it is known that only a certain number of outermost bills are likely to have too much wear or deformation, if the currency handling device needs to become available to users, or for other reasons. 
     At stage  412 , if the method determines that more bills are to be removed from the S/R drum, the method  400  returns to stage  404  and iterates the process for the next bill available on the S/R drum. Such iteration may proceed until a negative answer at stage  412  occurs. When a negative answer occurs at stage  412 , the method  400  advances to stage  414 . 
     At stage  414 , the bills that have been placed into the escrow section are restored to the specified S/R drum. As noted, depending on the configuration and process used by the escrow section, the bills may be restored in a different order from which they were removed, or with a different curvature orientation, as explained further below with respect to  FIG. 7 . 
       FIG. 5  illustrates a decision process  500  that may be used to trigger a command to move bills in a currency handling device, such as the command discussed in relation to stage  402  of the bill recycling method  400  just described. The decision process  500  may be performed by a control unit, such as control unit  310  of the currency handling device  300 , or by a separate computer or processing device having a communication link to the currency handling device. The decision process  500  may be implemented in software, firmware, or hardware. 
     The decision process  500  may have a decision block  508  configured to accept different types of trigger signal inputs. A first type of trigger signal input is the manual trigger signal  502 . An operator of the currency handling device may directly access the currency handling device and input the trigger signal command. This may be done by the operator through a secure access directly at the currency handling device, such as a key pad or touch pad. Alternatively, the operator may issue the command to move bills over a communication link to the currency handling device, such as the external communication link  314  as described in relation to  FIG. 3 . 
     A second type of trigger signal input is the automatic trigger signal  504 . The automatic trigger signal  504  may be internally generated, such as by the control unit  310  of the currency handling device  300 , or externally generated by a computer or processing unit separate from the currency handling device and communicated to the currency handling device. The automatic trigger signal  504  may result from a program of the processing unit that takes into account information related to the condition of the bills on an S/R drum, environmental factors, and/or other factors. 
     The automatic trigger signal  504  may arise when the length of time that at least one bill has been wrapped on an S/R drum exceeds a maximum allowable time. Such a maximum allowable time may be initially determined experimentally and programmed into the currency handling device (such as in the control unit  310 ), and may be altered or adjusted based on environmental parameters or properties, such as may be measured by the sensors  312  of the currency handling device  300 . Adjustments to the maximum allowable time may also use records of conditions, such as wear, of the bills on the S/R drums. For example, if upon insertion, a bill is determined (such as by control unit  310 ) to be only somewhat acceptable for storage on an S/R drum, the maximum allowable time may be reduced, whereas if the bill had been in new condition, the maximum allowable time may not need to be reduced. Other recorded conditions that may alter a maximum allowable time include temperature and/or humidity, as described previously. 
     A third type of trigger signal to the decision block  508  is the scheduled trigger signal  506 . The currency handling device may be programmed to apply a bill recycling method on a fixed schedule, such as at programmed or regular time intervals. This may allow for operational simplicity and convenience for the operators of the currency handling device. The time interval(s) may be programmed based on a worst case allowable maximum time for a bill to be on an S/R drum, and/or other criteria. If a manual trigger signal  502  is sent between scheduled trigger signals  506 , the schedule for the scheduled trigger signals  506  may be reset or restarted. 
     Decision block  508  may be configured to receive any combination of these, or still other, trigger signals. The decision block  508  may execute an OR operation so that even a single type of received trigger signal will cause decision block  508  to issue a MOVE command  510  to initiate a bill recycling method. 
       FIGS. 6A-C  illustrate states  600   a - c  of a currency handling device as bills are moved between components of the currency handling device during a bill recycling method. The currency handling device includes a control section  610 , such as may include control unit  310 , and/or a bank note acceptor, such as bank note acceptor  110 , or may be or have a link, such as external communication link  314 , to external controls. The currency handling device also includes a bill recycler  620  having S/R drums  622  and  624 . The currency handling device also has an escrow section  640  having an escrow storage drum  642  and an alternate storage component  644 . The currency handling device also includes a storage area  630  operable to receive and store bills  632 . The configuration of the currency handling device shown in  FIG. 6A  is an example only: the movements of bills to be described can apply to currency handling devices having alternate configurations. 
       FIG. 6A  shows a configuration of an initial state  600   a  of the currency handling device. A move command, such as described in relation to  FIG. 5 , is received at control section  610  to initiate a bill recycling operation, such as by the method  400 . Signals  602  may be transmitted between the control section  610  and the bill recycler  620  and the escrow section  640 . The signals may give information to identify S/R drum  622  and bill recycler  620  to undergo the bill recycling operation, to select which of escrow storage drum  642  and/or alternate storage component  644  is to be used, operational status of the various sections, amount or status of the bills on the S/R drum  622 , environmental factors of the various sections, and/or other information. The signals  602  may also include control signals to operate the S/R drum  622 , the escrow storage drum  642  and/or alternate storage component  644 , the various conveyor or movement components (not shown) that move the bills, and the like. 
       FIG. 6B  illustrates a second state  600   b  of a currency handling device as one or more bills are being removed, as in stage  404  of method  400 , from the S/R drum  622 . As each bill is removed, a determination is made, as described previously, whether the bill is to be moved into the storage area  630  or into the escrow section  640 . In the former case, the current bill is moved along conveyance path  606  into the storage area  630 . In the latter case, the bill is moved along conveyance path  604  to either the escrow storage drum  642  or the alternate storage component  644 . 
     In some embodiments, both the escrow storage drum  642  and the alternate storage component  644  may be used. For example, the S/R drum  622  may be holding more bills than either the escrow storage drum  642  or the alternate storage component  644  could store separately. In another example, innermost bills wrapped on the S/R drum  622  may be moved to the escrow storage drum  642  with the reverse orientation, as described in  FIG. 7 , to at least partially reverse bending deformation, while the outermost bills on the S/R drum  622  can be moved onto a flat stack of bills stored in the alternate storage component  644 . 
       FIG. 6C  illustrates a third state  600   c  of the currency handling device as bills are being restored from the escrow storage drum  642  to the S/R drum  622 . The bills may be moved along the conveyance path  608  to be wrapped or stored on the S/R drum  622 . 
     Variations of the methods and processes described above will be apparent to one skilled in the art. An example of such variations includes returning some or all of the bills moved to the escrow storage drum  642  to an S/R drum different from their originating S/R drum  622 . This may be useful for balancing the number of bills of a certain denomination stored on two (or more) S/R drums used to store bills of that denomination. 
       FIG. 7  illustrates a configuration  700  that may be used in any of the currency handling devices with any escrow section having an escrow storage drum as described previously. For convenience only, the configuration  700  will be described in relation to the currency handling device shown in  FIG. 6C  having the escrow section  640 . In the configuration  700 , when bills are moved from the S/R drum  622  onto the escrow storage drum  642 , the bills are wound to have an opposite orientation. In this way, curling of the bill substrate can be counteracted. 
     In the configuration  700 , the S/R drum  622  initially has bill  623  wrapped on it as shown, with alternate ends of the bill referenced by the solid and open circles. In either of dispensing or of movement of bills to the escrow storage drum  642 , the S/R drum  622  rotates clockwise. During stage I of a movement of bills to the escrow section, the bill is unspooled and moved toward and onto the escrow storage drum  642 . The escrow storage drum  642  is configured to rotate counterclockwise and wrap the bill  623 . The bill  623  now is stored on the escrow storage drum  642  with a bend or curl opposite to that which it had when stored on the S/R drum  622 , as indicated by the referenced ends of the bill  623 . At stage II of the movement of bills to the escrow section, the escrow storage drum  642  rotates counterclockwise as needed, such as to obtain a complete wrapping of the bill  623  onto itself, to receive further bills from the S/R drum  622 , or for other reasons. The opposite bend or curl of the bill  623  as stored on the escrow storage drum  642  may, at least in part, reverse, counteract, or undo any curling or bending the bill  623  may have had impressed by its original direction of wrapping on the S/R drum  622 . 
     At stage III of the movement of bills to the escrow section, the various bills that were temporarily stored on the escrow storage drum  642  are to be returned to the S/R drum  622  of the drum recycler section. The movement of bill  623  onto the S/R drum  622  is such that it is received onto the S/R drum  622  to have its original direction of wrapping on the S/R drum  622 . 
     In a variation of a movement of all bills from the S/R drum  622 , the bills may be wrapped onto the escrow storage drum  642  with either the same direction of bending or wrapping as on the S/R drum  622 . In this variation, for bill  623  to be received onto the escrow storage drum  642  with the same direction of bending, the escrow storage drum  642  would also be rotating clockwise. 
     Once all bills have been moved from the S/R drum  622  onto the escrow storage drum  642 , in this variation the S/R drum  622  may reverse its direction of rotation. Then the bill  623  may be moved off the escrow storage drum  642  back to the S/R drum  622  to be received with a direction of bending or wrapping opposite to what it had originally before the movement operation. A drum recycler implementing this variation of reversing the rotation direction of the S/R drum  622  may be configured with an additional dispensing slot. 
     The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of the specific embodiments described herein are presented for purposes of illustration and description. They are not targeted to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings.