Patent Publication Number: US-6666318-B2

Title: Method and apparatus for conditioning coins prior to discrimination

Description:
The present application is a continuation and claims priority to application Ser. No. 09/704,178 filed Oct. 31, 2000, now U.S. Pat. No. 6,484,884, issued Nov. 26, 2002, which is a continuation of Ser. No. 09/042,784, filed Mar. 17, 1998, now U.S. Pat. No. 6,174,230, issued Jan. 16, 2001, which is a continuation of Ser. No. 08/807,340, filed Feb. 28, 1997, now U.S. Pat. No. 5,842,916, issued Dec. 1, 1998, and claims priority in U.S. provisional application Serial No. 60/012,964, filed Mar. 7, 1996 for METHOD AND APPARATUS FOR CONDITIONING COINS PRIOR TO TRANSPORT, SORTING AND COUNTING. The present application also claims priority in PCT Application US97/03136, filed Feb. 28, 1997. The entire disclosures of the prior applications are considered to be part of the disclosure of the accompanying application and are hereby incorporated by reference. 
     This invention relates to a device and method for conditioning coins and in particular for removing debris, contamination, corrosion and unwanted materials from coins prior to transport to devices for automatically counting and/or sorting the coins. 
    
    
     BACKGROUND INFORMATION 
     Coin counting and sorting equipment is often adversely affected by the presence of foreign matter. Mechanical and electronic sorting systems and methods can fail, be damaged, caused to misread and/or become jammed. Mechanical devices such as coin transport mechanisms, coin hoppers and the like may be caused to jam or otherwise malfunction by foreign matter. Sensors may be prevented from accurately identifying a coin because of non-coin matter accompanying the coins. Sensors may become blocked or rendered ineffective because of non-coin matter collecting and or being deposited onto sensor parts. When the sensors fail the coin counting process has failed and coins are often undesirably rejected or are accepted as the incorrect denomination. The amount of non-coin matter varies and is unpredictable. In many situations, the reliability and accuracy of coin sorting, identification and/or counting processes is very important and thus the process of removing non-coin matter before the coins are transported to sorting, identification and/or counting sensors is important. The presence of non-coin matter is believed to be especially troublesome in the context of self-service, stand-alone, unmonitored and/or unattended devices, e.g. devices for counting/sorting coins by the general public or other non-trained persons. Accordingly, it would be useful to provide self-service coin processing machinery which can process coins which are accompanied by non-coin matter. 
     The removal of one type of undesirable non-coin matter does not often eliminate other kinds because the material is so varied. Metal objects may be identified by properties such as density, shape, magnetic characteristics, etc. Typically, removing dense matter such as rocks is entirely different than removing metal or paper objects. Coins may have been stored with materials that have caused corrosion or have become coated with oils, glue and other liquids that collect dirt and other debris. These coins contaminate others as they come into physical contact and may cause adhesion, clumping or grouping of coins. A magnetic separator would not eliminate all this various non-coin matter. 
     SUMMARY OF THE INVENTION 
     The present invention provides for separating non-coin objects from coins in a coin-sorting, discriminating or counting device, preferably prior to coins reaching certain coin transport devices, such as transport devices for transporting coins toward a hopper or sensor, preferably prior to coins reaching a coin hopper which provides coins to sensors and preferably prior to the coins reaching the counter/sorting sensors. In one embodiment the separation device is a generally tubular or concave surface, having one or more openings through which non-coin objects travel, and which cause coins introduced thereto to undergo relative movement to assist in separation of non-coin objects. In one embodiment, the relative movement preferably involves lifting some coins with respect to others and may be achieved by pivoting or rotating the tubular or concave surface, e.g., about an axis. Agitation may be further enhanced by projections formed in or attached to the surface, such as vanes, fins, blades, spines, dimples, ridges, and the like. Movement of coins through or across the tubular or concave surface may be effected or enhanced by various mechanisms. Although gravity feed may be used, in one embodiment blades such as angled, spiral or helical blades assist in moving the coins e.g. in a screw conveyor fashion. 
     Except for coin entrance and exit ports, diameters, sizes or shapes of the openings are configured to prevent passage therethrough of the smallest coin intended to be counted by the counting device. In one embodiment, a drive mechanism rotates the cylinder about its longitudinal axis to agitate the coins therein by lifting coins and, preferably, moving the coins through the cylinder by a screw mechanism. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a coin-counting device of a type which may be configured to incorporate features of the present invention; 
     FIG. 2 is a rear perspective view of a receiving tray and rib slide of a type which may be provided in the apparatus of FIG. 1; 
     FIG. 3 is a schematic side view of a feed tray and tumbler device according to an embodiment of the present invention; 
     FIG. 4 is a schematic depiction of the position of a helical blade in an embodiment of the present invention; 
     FIG. 5 is a partial side view of a tumbler device according to an embodiment of the present invention; 
     FIG. 6 is an end view of a tumbler device according to an embodiment of the present invention; 
     FIG. 7 is a partial perspective view, partially exploded, of a tumbler device according to an embodiment of the present invention; 
     FIG. 8 is a partial perspective view, partially exploded, of a tumbler device according to an embodiment of the present invention; 
     FIG. 9 is a rear perspective view of a modular feed tray/tumbler device according to an embodiment of the present invention, which may be incorporated into the apparatus of FIG. 1; 
     FIG. 10 is a side view of the apparatus of FIG. 9; 
     FIG. 11 is an end perspective view of the apparatus of FIG. 9; 
     FIG. 12 is an end view of a tumbler cylinder, according to an embodiment of the present invention; 
     FIG. 13 is a front perspective view, with exploded cover plate, of an apparatus according to an embodiment of the present invention; 
     FIG. 14 is a front perspective view, partially exploded, of the apparatus of FIG. 13; 
     FIG. 15 is a rear perspective view, partially exploded, of the apparatus of FIG. 13; 
     FIG. 16 is a perspective view, partially exploded, of a trommel assembly, according to an embodiment of the present invention; 
     FIG. 17 is a perspective view of a first end cap which may be used in connection with an embodiment of the present invention; 
     FIG. 18 is a perspective view of a trommel body, according to an embodiment of the present invention; 
     FIGS. 19A-D are right side elevational, top plan, left side elevational and end views of a trommel body in open configuration, according to an embodiment of the present invention; 
     FIG. 19E is a side view of a vane which may be used in connection with an embodiment of the present invention; 
     FIG. 20 is a perspective view of a long object trap of a type which may be used in connection with an embodiment of the present invention; and 
     FIG. 21 is a cross sectional view taken along line  21 — 21  of the device of FIG.  20 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 depicts a coin-counting device which may incorporate features of the present invention. FIG. 1 depicts a device in perspective with various doors opened, and a bag trolley  1610   a  partially withdrawn. In the embodiment of FIG. 1 a coin tray  1402  is mounted pivotally about axis  1414  (FIG.  2 ), so that a user, after inserting coins in the tray  1402  may lift the tray, using handle  1404 , to move coins out of the tray area  1424 , over the ridge or peak  1414 , and onto a slope  1428 , for movement past a gate  1432 , and onto a ribbed chute  1406 . Coins are moved into a hopper  1604  for transfer to a counter or sorter  1212 , where sorted or counted coins are diverted to bins or, in the embodiment of FIG. 1, bags  1608  held in the trolley  1610   a,    1610   b.  Information processing and/or communication devices and/or printers or dispensers  1628 ,  1874 , which may include, e.g., a computer and/or printer may be provided for outputting information about the sorted coins or counted coins, as described, for example, in PCT application PCT/US95/05356 filed May 1, 1995, and/or U.S. application Ser. No. 08/255,539 filed Jun. 6, 1994, both of which are incorporated herein by reference. 
     Although the invention is described herein in the context of a device for discriminating or handling coins, the device can generally be applied to separating small, typically unwanted matter or material from larger items. For purposes of the following discussion, the smaller separated items or material (which can include e.g., without limitation, dust, sand, lint, paper, hair, liquids, and myriad other items) will be referred to from time to time herein generically as “dirt” with the understanding that many types of small items or materials, some of them valuable items or materials, can be separated using the present invention. 
     While the device of FIG. 2 has proved to be useful and can assist, to at least some degree, in removing non-coin matter from a batch or plurality of coins deposited in the tray  1402 , e.g., through perforations therein and/or traveling over the chute  1406  (e.g., by perforations therein). It is believed additional improvements in preparing coins for counting/sorting can be achieved by incorporating a device which lifts or otherwise moves coins, relative to one another, to assist in separating non-coin matter. 
     In general, FIGS. 3 through 12 and FIGS. 13 through 21 illustrate different embodiments of the present invention, with the understanding that the illustrated embodiments are not necessarily either mutually exclusive (since features or aspects of one embodiment might be incorporated or substituted into another embodiment), nor incompatible (in the sense that some features or aspects of the invention may be common to more than one embodiment). 
     In the embodiment depicted in FIG. 13, a device is illustrated which may be generally considered in four sections: an input tray section  1302 , a trommel feed section  1304 , a trommel section  1306 , and trommel output section  1308 . The illustrated input tray section  1302  is substantially similar to that described in U.S. patent Ser. No. 08/255,539 (now U.S. Pat. No. 5,564,546) and/or PCT/US95/05356, and as described briefly above. The trommel feed region  1304  contains, in the illustrated embodiment, a first chute  1310 , and a second chute  1312  for conveying coins and other materials to an input opening of the trommel (described below). The trommel feed region  1304  may contain devices for performing additional functions such as stops or traps, e.g., for dealing with various types of elongate objects, a gate for controlling flow of coins and other objects, lights or other signaling devices, e.g., for prompting input of coins or cessation thereof, and/or drive devices or transmissions for rotating or otherwise moving the trommel as described below. The trommel region  1306  contains a perforated-wall trommel  1314  rotatably mounted via end caps  1316 ,  1318 , which preferably contain bearing surfaces. The trommel output region  1308  provides an output chute for directing the (at least partially) cleaned coins exiting the trommel in a desired direction  1320 , e.g., towards a hopper  1604  or similar device. 
     As best seen in FIG. 15, the first chute  1310  may be provided with first and second pins  1322   a,    1322   b.  The pins  1322   a,    1322   b  are provided to block passage of elongate flexible items such as lottery tickets, cardboard, paper and the like. The spacing between the pins  1322   a,    1322   b  or between the pins and the sides of the chute  1310 , determines the size of the largest item which may be allowed to pass. In one embodiment, the pins are positioned to allow a coin with a diameter of about 34 mm to pass, but to block items larger than about 34 mm. In one embodiment, the tray  1310  is stainless steel and the pins  1322   a,    1322   b  are steel pins welded to the chute  1310 . Although two pins are depicted, more or fewer pins could be provided, it being understood, however, that pins tend to slow down coin feed rates somewhat. In the depicted embodiment, the pins  1322   a,    1322   b  are about two inches (about 5 cm) apart, disposed symmetrically of the center line of the first chute  1310 . In the depicted embodiment, the pins are about 0.5 inch (about 12 mm) high. 
     A controllable gate  1324  is mounted transverse to the first chute  1310  to permit rotation from the closed configuration depicted in FIG. 15, blocking passage of coins, to an open configuration permitting passage of coins or other objects past the gate. Preferably the gate  1324  is formed of rubber, e.g., to avoid pinching of fingers. Rotation of the gate  1324  is controlled by a solenoid  1326 . The solenoid  1326  is activated in response to a signal from a control device such as a computer or other information processing device  1628 ,  1874  (FIG.  1 ). The gate may be controlled to open or close for a number of purposes, such as in response to sensing of a jam, sensing of load in the trommel or hopper, and the like. In the depicted embodiment, signal devices such as LED or other lights  1328   a ,  1328   b , can provide a user with an indication of whether the gate  1324  is open or closed (or otherwise to prompt the user to feed or discontinue feeding coins or other objects). Although instructions to feed or discontinue may be provided on the computer screen (FIG.  1 ), indicator lights  1328  are believed useful since users often are watching the throat of the chute  1310 , rather than the computer screen, during the feeding of coins or other objects. 
     Downstream of the first chute  1310  and gate  1324  is a second chute assembly  1312 . Preferably, the second chute  1312  provides a funneling effect by having a greater width  1330  at its upstream edge than its downstream edge. Preferably, the coins cascade or “waterfall” when passing from the first chute  1310  to the second chute  1312 , e.g. to increase momentum and tumbling of the coins. In one embodiment the width at the upstream edge is about 5.2 inches. (about 13 cm), and the width at the downstream edge is about 2.5 inches (about 6 cm). Preferably, the depth of the chute increases in the directional flow, such as providing a depth of about one inch (about 2.5 cm) at the upstream edge, and a depth of about 1.5 inches (about 3.8 cm) at the downstream edge. 
     Preferably, the chute  1312  is configured to facilitate coin travel, e.g., by reducing or eliminating the effects of friction, surface tension, and the like. Preferably, the chute  1312  upper surface has no flat region large enough for a coin to contact the surface over one of the faces of the coin, i.e., preferably the coin which touches the chute  1312  preferably makes contact on, at most, two points. Preferably, the surface of the chute  1312  is constructed such that it has a finite radius of curvature along any plane normal to its longitudinal axis  1332 , and preferably with such radii of curvature increasing in the direction of coin flow. 
     Preferably the chute  1312  has an upper surface which is substantially smooth and free from protrusions, ridges, throughholes or other holes, and the like. In one embodiment the chute  1312  is formed from injected molded plastic such as an acetal resin or plastic, a polyamide polymer, such as a nylon, Deirin®, available from E. I. DuPont de Nemours &amp; Co., and the like. Other materials that can be used for the chute include metals, ceramics, fiberglass, reinforced materials, epoxies, ceramic-coated or-reinforced materials and the like. 
     As best seen in FIG. 14, the trough assembly  1312  terminates in a collar  1333  defining a mouth  1334 , which is configured to feed coins from the chute  1312  into a first opening  1336  of the trommel assembly  1338 . The mouth  1334  is formed with an upper lip  1340 . In the depicted embodiment the first opening  1336  of the trommel assembly  1338  is defined by a first end cap  1316  which is coupled to a trommel body  1314 . The first end cap  1316  has a smooth cylindrical bearing surface  1342  configured to mate with a bearing surface  1344  of the chute collar, supporting the rotation of the trommel assembly  1338  about a rotation axis  1346  in a manner described more fully below. An exterior surface of the first end cap  1316  is geared  1348  to mesh with a drive gear  1350  powered by a drive motor  1352 . The drive gear  1350  is preferably spaced from the stationary bearing  1344  sufficiently to permit manual engagement of the end cap gear  1348  with the drive gear  1350  and simultaneous mating of the first end cap bearing  1342  with the stationary bearing  1340  by merely grasping the trommel assembly  1338 , aligning it with the collar  1333  (preferably facilitated by a bevel), rotating the trommel assembly  1338  about its longitudinal axis as needed to mesh the gears  1348 ,  1350 , and pushing towards the chute collar  1333 . Similarly, the trommel assembly  1338  may be manually disengaged from the drive gear  1350  and bearing  1344  by pulling in a direction away from the chute collar  1333 . Preferably, as best seen in FIGS. 16 and 17, the end cap  1316  includes resilient tabs  1712   a,    1712   b,    1712   c,    1712   d  for engaging slots  1812   a,    1812   b,    1812   c,    1812   d,  respectively, and tabs  1714   a,    1714   b,    1714   c,    1714   d  for capturing corners of the trommel  1314 . 
     A similar system of tabs  1612   a,    1612   b,    1612   c,    1612   d,    1614   a,    1614   b,    1614   c,    1614   d  engage and capture slots  1814   a,    1814   b,    1814   c,    1814   d,  and corners of the downstream end of the trounce  1314 . Preferably, the tab and slot system  1712   a,    1712   b,    1712   c,    1712   d,    1812   a,    1812   b,    1812   c,    1812   d,  or the trommel  1314  and first end cap  1316  are different from the tabs  1612   a,    1612   b,    1612   c,    1612   d,    1814   a,    1814   b,    1814   c,    1814   d  of the second end cap  1318  in such a manner that the end caps  1316 ,  1318  are coupled to the first and second ends  1616   a,    1616   b  of the trommel  1314 , respectively, and not the other way around. In the depicted embodiment, the downstream tabs and slots have dual protrusions and openings corresponding to the single protrusions and openings of the upstream tabs and slots. Preferably, the resiliency of the tabs  1712 A, -B, -C, -D,  1612 A. -B, -C, -D is such that the end caps  1316 ,  1318  remain securely coupled to the trommel  1314  during normal use, but may be manually removed without the use of special tools, preferably without the use of any tools, e.g., for cleaning, as described below. Preferably, the end caps  1316 ,  1318  are formed of a plastic material such as an acetal plastic, nylon, Delrin® and the like. Preferably, when both the end caps  1316 ,  1318  and the bearing surfaces  1344 ,  1360  are formed of plastic, different plastics are used for mating bearing surfaces, such as by forming the end caps  1316 ,  1318  of Delrin® and the bearing surfaces  1344 ,  1360  of a nylon. This is believed to reduce friction and facilitate rotation of the trommel. 
     As best seen in FIG. 18, the trommel  1314  is shaped to define four rectangular walls  1816   a ,  1816   b ,  1816   c ,  1816   d  to define a substantially square cross section. In the view of FIG. 18, interior vanes have been removed, for clarity. The trommel  1314  provides at least one hole for permitting passage or exit of dirt from the trommel and, preferably, as depicted, includes a plurality of such holes  1818 . The holes  1818  are sufficiently small to prevent passage of the smallest coins (or other object to be discriminated). In one embodiment, when the device is used in connection with U.S. coins, the holes  1818  have a diameter of about 0.61 inches (about 15 mm) to prevent passage of U.S. dimes. In the depicted embodiment, the holes have an inter-row and inter-column spacing  1916   a ,  1916   b  of about 0.7 inches (about 18 mm). The number, density and distribution of holes  1818  can be configured in a number of ways, other than that depicted. Many factors affect the choice of the number, size, density and distribution of holes. For example, the configuration of the holes affects the overall strength and stability of the trommel  1314  and thus the configuration of the holes may be modified to accommodate the characteristics of different materials used for forming the trommel  1314 . The configuration depicted in FIG. 18 is generally believed to provide a relatively large, total hole area (to facilitate removal of dirt) while maintaining the desired structural integrity and sturdiness of the trommel  1314 . The depicted distribution of holes in rows and columns is believed to contribute to stability, although other configurations are also possible, such as hexagonally-centered holes, randomly positioned holes, and the like. Although in the configuration of FIG. 18 all the holes are of the same size, it is possible to provide holes in various sizes (smaller than the largest hole which prevents passage of the smallest coin to be treated). Although it is preferred to distribute holes  1818  over substantially the entire inner surface of the trommel  1314 , it would be possible, if desired, to position holes such that some areas of the trommel are substantially free from holes. 
     In the depicted embodiment dimples  1820  are formed protruding slightly into the interior region of the trommel  1314 . The dimples  1820  are believed to facilitate throughput by avoiding adhesion (such as surface tension—induced adhesion) and/or friction between coins and the interior surface of the trommel. The dimples are believed to reduce the likelihood of adhering a customer&#39;s coins to the trommel wall, resulting in loss of credit to the customer. It is believed the dimples prevent or reduce surface-to-surface contact of coins with an interior surface of the trommel over a substantial region of the coin face surface and, accordingly, in the depicted embodiment, dimples  1820  are positioned in any location of the interior surface where a flat region of substantial area would otherwise occur (such as regions between holes). Other shapes, sizes, locations and distributions of protrusions, ridges, fingers, and the like may also be useful to facilitate throughput. 
     In the depicted embodiment dimples  18  are formed protruding slightly into the interior region of the trommel  1313 . The dimples  1820  are believed to facilitate throughput by avoiding adhesion (such as surface tension-induced adhesion) and/or friction between coins and the interior surface of the trommel. The dimples are believed to reduce the likelihood of adhering a customer&#39;s coins to the trommel wall, resulting in loss of credit to the customer. It is believed the dimples prevent or reduce surface-to-surface contact of coins with an interior surface of the trommel over a substantial region of the coin face surface and, accordingly, in the depicted embodiment, dimples  1820  are positioned in any location of the interior surface where a flat region of substantial area would otherwise occur (such as regions between holes). Other shapes, sizes, locations and distributions of protrusions, ridges, fingers, and the like may also be useful to facilitate throughput. 
     A configuration of a trommel according to one embodiment of the invention is illustrated in FIGS. 19A through 19D. In the depicted embodiment, the trommel is formed from two halves  1902   a ,  1902   b , rotationally coupled, e.g. by a hinge, such as a piano hinge  1904  or other rotational device such as clips, screws, interconnecting tabs and slots, and the like. The hinge  1904  permits the two halves  1902   a,    1902   b  to be reconfigured in a “clam shell” fashion between the closed operating configuration depicted in FIG. 18, and an open configuration (e.g., for maintenance) depicted in FIGS. 19A through 19D. The edges  1906   a,    1906   b  diagonally opposed to the hinge  1904  are fitted with latching devices such as tabs  1908   a,    1908   b,    1908   c,    1908   d,  which resiliently latch, in an interference fashion, with corresponding regions  1910   a,    1910   b,    1910   c,    1910   d  of opposing edges. The end caps  1316 ,  1318  further assist in maintaining the trommel in the closed configuration during operation. 
     The dimensions of the trommel may be selected depending upon the desired capacity and throughput, as well as the structural requirements for the trommel. In the depicted embodiment, the trommel has a length  1912  of about 10.6 inches (about 27 cm), with each wall having an effective width  1914  of about 2.9 inches (about 7.5 cm). 
     In general, it is preferred to provide a trommel which causes or at least urges coins, during rotation of the trommel, to freely fall through at least a portion of the interior of the trommel (as opposed to, for example, merely rolling or tumbling in a mass adjacent the lowest surface of the trommel). Thus, preferably the trommel assists in lifting coins, as it rotates, and dropping the coins from an elevated height through at least a portion of the interior of the trommel. Without wishing to be bound by any theory, a number of features of the trommel are believed to contribute to the desired coin lifting/free-fall. It has been found, for example, that a trommel with a circular cross-section tends to result in coins remaining adjacent the lower surface (albeit while tumbling), without substantial lifting or free-fall. It is believed that providing a trommel cross-section which defines flat surfaces and/or corners (i.e., surfaces meeting at an angle) assists in coin lifting/free-fall. In the depicted embodiment, the trommel has a substantially square cross-section, thus defining four substantially flat surfaces, and four corners. It is believed that other cross-sections may provide at least some desirable lifting/free-fall, including cross-section which have corners but no flat surfaces, and/or cross-section with more or fewer than four flat surfaces. Cross-sections which are non-regular (such as isosceles triangular cross-sections) or which have local concavities, such as star-shaped cross-sections, may be useful in some contexts. Other potential cross sections include triangles, pentagons, hexagons, octagons, semi-circles, rectangles, inflated or pillowed cross-sectional shapes (such as defined by three or more intersecting circular or elliptical arcs), cross-sections with surfaces defined by various non-linear shapes such as ellipses, parabolas, hyperbolas, and the like. Although the depicted embodiment provides a trommel which has a cross-section that is substantially constant along its longitudinal axis, it is also possible to provide trommels with cross-sections that vary along the longitudinal axis such as tapering or flaring cross-sections. Although a number of trommel configurations are operable and each may provide certain advantages in some circumstances, the depicted configuration is believed to provide at least the advantages of relatively low manufactured cost, easy access, low parts count, wider material choice and ease of design, construction, and maintenance. 
     Another feature which is believed to contribute to the desired lifting/free-fall behavior of the coins or other objects is a provision of one or more vanes protruding into the interior of the trommel  1922   a ,  1922   b ,  1922   c ,  1922   d ,  1924   a ,  1924   b ,  1924   c ,  1926   a ,  1926   b ,  1926   c ,  1926   d ,  1928   a ,  1928   b ,  1928   c ,  1928   d . It is believed that by positioning vanes at an angle such as about 15°  1930  to a plane passing through the longitudinal axis  1932 , the vanes assist not only in providing coin-lifting/free-fall, but also assist in moving the coins in a direction towards the output region  1308 . Although it would be possible to provide one or more vanes whose lateral position (with respect an interior surface of the trommel) changed monotonically, it is believed such configuration is not as effective in assisting with movement of coins towards the output portion  1308 , as a configuration in which the lateral position of the vane changes non-monotonically. In the depicted embodiment this is accomplished by providing the vanes in several subparts or segments, defining discontinuities or nodes at longitudinal positions  1936   a ,  1936   b ,  1936   c ,  1938   a ,  1938   b ,  1940   a ,  1940   b ,  1940   c ,  1942   a ,  1942   b ,  1942   c  therebetween. Without wishing to be bound by any theory, it is believed that a configuration in which the nodes for adjacent sides of the trommel are at similar longitudinal positions does not promote the desired transport of coins towards the output end  1308 . Accordingly, the nodes  1936   a ,  1935   b ,  1936   c ,  1938   a ,  1938   b ,  1940   a ,  1940   b ,  1940   c ,  1942   a ,  1942   b ,  1942   c , are perfectly configured such that nodes defined on one surface are at longitudinal positions different from the node positions for an adjacent surface and, preferably, different from node positions for all other surfaces, as depicted. In the depicted embodiment, eleven of the fifteen vane segments are the same length (about 2.7 inches or about 6.8 cm in the depicted embodiment), with the desired node offset resulting in the remaining segments  1922   a ,  1922   d ,  1926   a ,  1928   d  being shorter. 
     In the depicted embodiment, vanes are separately formed and attached to the interior surfaces of the trommel. Preferably, attachment is via tabs (not shown) protruding from the undersurface of the vanes and engaging with slots (not shown) formed in the trommel surfaces. In the depicted embodiment, rivets  1948  are used for attachment. Attachment could also be by interference fit, bolts and nuts, welding, brazing, soldering, adhesives, or vanes may be integrally formed with the trommel. In one embodiment the vanes are formed of a material similar to the material used to form the trommel surfaces, preferably stainless steel, although plastics, fiberglass, ceramics, and the like can also be used. 
     In one embodiment, as depicted in FIG. 19E, the vanes protrude a distance  1952  into the interior of the trommel of about 0.45 inches (about 1.2 cm). In the depicted embodiment, the upper portion (such as the upper 0.2 inches (about 5 mm)  1954  is angled (e.g., at about 45°)  1956  to a normal  1958  to the adjacent trommel surface. The angled portion  1954  is believed to assist in lifting the coins higher (compared to non-angled vanes) during trommel rotation. 
     In the depicted embodiment use of vanes for assistance in moving the coins towards the output in  1308  is particularly useful since the depicted configuration shows a substantially horizontal longitudinal axis  1346 . If desired, a device can be constructed such that the rotation axis  1346  departs from the horizontal, such as being inclined towards the output end  1308 , e.g., to assist in movement of coins towards the output portion  1308 . The inclination, or lack thereof, of the rotation axis  1346  is determined by the location of the downstream bearing  1360  which engages the cylindrical bearing surface  1362  of the second end cap  1318 . Preferably, the bearing ring  1360  is formed of a plastic material such as a nylon or Delrin®, and is preferably formed of a material different from the material of the bearing surface  1362  of the second end cap  1318 . The second end cap  1318  defines an opening  1364  through which coins or other objects exit from the trommel assembly  1338 . 
     The output bearing  1360  is held in position by an end wall  1366 . In the depicted embodiment, the end wall  1366  is mounted to the frame  1368  so as to permit the end wall  1366  to be moved so as to allow the trommel assembly  1338  to be withdrawn, e.g., for cleaning or maintenance. In the depicted embodiment, the end wall  1366  is coupled to legs  1372   a ,  1372   b  which fit into rails  1374   a ,  1374   b ,  1374   c ,  1374   d , to permit sliding movement in an engagement direction  1376   a  or disengagement  1376   b  direction. Springs  1378   a ,  1378   b , normally urges the legs  1372   a ,  1372   b , and thus the wall  1366  in the engagement direction  1376   a . The springs  1378   a ,  1378   b  are sufficiently strong to securely maintain the trommel assembly  1338  in the engaged position (i.e., the position shown in FIG. 13) during normal operation, but permit the output portion  1308  to be moved in the disengagement direction  1376   b  manually (i.e., without the use of special tools, preferably without the use of any tools) in an amount sufficient to prevent disengagement and withdrawal of the trommel assembly  1338 , e.g., for maintenance, cleaning, replacement, inspection, and the like. Preferably, a limit screw  1377   a ,  1377   b  provides a stop to prevent the force of the springs  1378   a ,  1378   b  from causing the bearing  1360  to thrust against the end cap  1318 , undesirably increasing friction. In the depicted embodiment, the tray  1382  is formed in two portions  1382   a ,  1383   b , coupled in a sliding fashion to permit the tray to be collapsed in a direction  1385 . Collapsing the tray is believed useful in assisting in tray removal, for certain configurations, e.g., where space is restricted. Preferably the tray  1382  has sufficient capacity that tray emptying is required no more often than about once every two weeks, during normal anticipated use. Other fashions of permitting disengagement or movement of the bearing ring  1360  can be used, such as providing for hinged or pivoting movement. The depicted sliding movement is believed to permit removal of the trommel  1338 , e.g., through the open bottom  1382  of the frame, while reducing or minimizing longitudinal space requirements. In the depicted embodiment, an output chute  1374  is provided adjacent the output opening of the trommel. In the depicted configuration the output chute  1374  is configured to direct coins, output from the trommel, in a substantially downward direction  1320 . A tapered region  1378  assists in directing the coins. 
     Preferably, a tray or other container  1382  is located beneath the trommel assembly  1338  to catch dirt which passes through the trommel dirt openings. Preferably, the tray  1382  is configured to be easily removed (e.g., for emptying, cleaning, and/or permitting access to the underportion of the device). In the depicted embodiment, the first edge  1384  of the tray  1382  engages a rail or lip formed on the frame  1368 , and the opposite edge  1386  may be rotated upward to engage with spring clips  1390   a ,  1390   b  on the opposite side of the frame. 
     In one embodiment, a long object trap  2000  (FIG. 20) may be positioned between the input tray  1402  and the trommel  1306  to assist in preventing insertion of long, relatively rigid objects such as a popsicle stick, into the trommel. In the depicted embodiment, the long object trap includes a first, upstanding wall  2002  and, somewhat downstream, a second, descending wall  2004 . As depicted in FIG. 21, any attempt to insert a rigid elongated object  2006  will result in the object contacting a floor region  2008 , preventing further passage. 
     In operation, the user of the embodiment of FIGS. 13-21 places a mass of coins, preferably all at once (typically accompanied by dirt or other non-coin objects) in the input tray  1402 . The user is prompted to push a button to inform the machine that the user wishes to have coins discriminated. Thereupon, the computer causes the input gate  1324  to open (via solenoid  1326 ) and illuminates a signal to prompt the user to begin feeding coins. When the gate  1324  is open, the motor  1352  is activated to begin rotating the trommel assembly  1338 . The user moves coins over the peak defined by the hinge  1414 , typically by lifting the tray  1402  at least partially, and/or manually feeding coins over the peak  1414 . The coins pass the gate  1396  (typically set to prevent passage of more than a predetermined number of stacked coins, such as by defining an opening equal to about 3.5 times a typical coin thickness). The coins move down the first trough  1310 , where the pins  1322   a  and  1322   b  prevent passage of certain long objects such as lottery tickets and the like. A long object trap (if any) prevents passage of other types of objects such as popsicle sticks. Coins continue to flow down the second trough or chute  1312 . Coins travel through the chute collar mouth  1334  and into the interior of the rotating trommel assembly  1338 . Within the rotating assembly  1338  the coins are lifted and free-fall, at least partially, through the interior of the trommel, preferably at least partially in response to provision of flat surfaces, corners, and/or vanes within the trommel. As the coins free-fall or are otherwise agitated by the rotating trommel, dirt particles or other non-coin objects pass through the holes of the trommel and fall into the tray  1382 . Coins travel through the trommel, e.g., in response to angled disposition of the vanes and the inclination of the trommel, if any. In general it is believed that a larger angle provides for shorter residence time, but less thorough cleaning or lifting of the coins. Thus the angle selection may require a compromise between the desire for thorough cleaning and the desire for short residence time (which contributes to higher throughput). The depicted configuration, when the trommel rotates at about 36 RPM, and using a typical mixture of U.S. coins, provides a coin residence time of approximately 10 seconds. Under these conditions, throughput during normal use is believed to be sustainable at about 600 coins per minute or more. Configuration and operating conditions can be adjusted to increase or decrease throughput, e.g., by changing the size, length or capacity of the trommel, increasing rotation rate, changing vane configuration or angles, and the like, within structural constrains for desired durability, lifetime and maintenance costs. The coins, after being at least partially cleaned, exit the second opening  1364  of the trommel, and are directed by the output chute  1374  in an output direction  1320  toward downstream components such as the hopper of a coin transport/discrimination device. 
     Preferably, operation of the device is monitored, such as by monitoring current draw for the motor  1338 . In this configuration, a sudden increase or spike in current draw may be considered indicative of an undesirable load and/or jam of the trommel assembly  1338 . The system may be configured in various ways to respond to such a sensed jam such as by turning off the motor  1352  to stop attempted trommel rotation and/or reversing the motor, or altering motor direction periodically, to attempt to clear the jam. Jamming or undesirable load can also be sensed by other devices such as magnetic, optical or mechanical sensors. In one embodiment, when a jam or undesirable load is sensed, coin feed is stopped or discouraged, e.g., by closing gate  1324  and/or illuminating a “stop feed” indicator  1328   b    
     Turning, now, to the embodiments of FIGS. 3-12, in FIG. 3, the perforated tray  1402  provides a device for moving coins therein (upon lifting the tray  1402  about pivot axis  1414 ) through a slot  312 , past a gate  314  which may be, e.g., a controllable gate, and via chute  316  into a perforated-wall cylinder  318 . Preferably, the perforated wall cylinder  318  is configured to assist in or cause the relative movement of coins introduced thereto, such as by being rotatable in a first direction  322  about its longitudinal axis  324 . Various rates of rotation can be used. Preferably, a high feed rate through the cylinder is achieved, such as a rate of at least  100  coins per minute, preferably at least 200 coins per minute, more preferably at least about 600 coins per minute or more. 
     Preferably, the perforations or holes  326  formed in the surface or wall of the cylinder  318  are shaped or sized to prevent or avoid passage, through the holes  326 , of the smallest coins which are intended to be counted by the counting device. Various hole or opening sizes and shapes are possible, giving due consideration to the size or diameter of the coins and, in some cases, the tumbling speed or rotational velocity. In one embodiment, oblong openings are provided and are believed to be useful, in some embodiments, in further assisting removal of non-coin matter. 
     Preferably, openings  326  are as large as possible to accommodate large non-coin matter without undesirably diverting or hindering the feed rate of smaller diameter coins. A number of factors may affect the choice of hole sizes. As described below, internal vanes, fins, ridges and other projections may be positioned, e.g., on the inside surface of the cylinder, and there must be sufficient remaining surface to allow these projections to be attached and/or formed. The size of the holes and/or the spacing and/or pattern of the holes may affect the strength or load capacity of the cylinder  318 . Removing non-coin debris is important, and having a large amount of open surface area (total surface area of all holes in the cylinder  318 ) tends to increase the effectiveness of eliminating large objects, including large, dense and/or odd-shaped objects. However, the total area occupied by holes in the drum, while being desirably as large as feasible, should not be so large as to cause the cylinder to lose structural integrity, having a small than desired load capacity, and/or be subject to unwanted deflection or failure. 
     A number of different materials can be used for forming a cylinder  318 . In one embodiment, the cylinder may be formed of cast urethane. In one embodiment, longitudinal steel and/or stainless tubing is used for the tumbler cylinder  318 . Preferably, the tube is non-magnetic, such as being formed of stainless steel such as T-304, T-316, and/or ELC grade steel. By providing a non-magnetic tumbler, cylinder  318 , avoids interfering with devices such as magnets (not shown) that may be provided for eliminating ferrous coins and/or ferrous non-coin matter. The thickness of the drum  318  can be selected to provide a desired coin capacity or load-bearing ability, a desired usable lifetime and/or desired wear factor. In one embodiment the cylinder  318  is constructed from corrugated spiral lock seam tubing. This embodiment is particularly useful in that blades or fins can be configured to be positioned adjacent to the spiral seams, which is believed to offer enhanced strength and/or higher pressure differentials, and thus allow a reduction in wall thickness and overall mass of the cylinder over what would otherwise be required. A suitable tubing may be obtained from Perforated Tubes Incorporated of Ada, Mich. 
     Preferably, one or more protrusions are provided extending inwardly into the interior of the cylinder  318 . As depicted in FIG. 4, a helical blade  402  may be provided. The blade assists in moving the coins such as by lifting coins from a lower position to a higher position, and releasing the lifted coin on the upper level of the coins in cylinder  318 , as the cylinder  318  is rotated  322 . Further, in the depicted embodiment, the blade, being helical-shaped  402 , acts to convey the coins in a direction  332  toward later or downstream apparatus such as a hopper  334 . In this fashion, even though in the embodiment of FIG. 3 the axis  324  of the cylinder  318  is horizontal, coins may be moved in a direction  332 , without the need for relying on a gravity feed. Such a configuration is useful in order to minimize the vertical extent  336  required for the device. If desired, however, the tumbler cylinder  318  may be tilted, e.g. as in FIG. 5, and, if desired, a gravity feed may be used to assist in moving coins. 
     Various materials may be used for forming or coating the interior surface and/or projections  402  of cylinder  318 . A low friction or non-stick material such as Teflon may be used to avoid unwanted adhesion of coins or non-coin matter to the tumbler  318 . In one embodiment, the surfaces that will come in contact with the coins and non-coin matter will be chemically resistant and inert, to avoid corrosion and/or reaction with materials that may be introduced into the tumbler  318 . In one embodiment, the surfaces are durable since they will be constantly impacted by the coins and other materials. Wear-resistant materials that may be used include silicon carbide, or other ceramic material, steel, carbon-impregnated or carbon fiber or fiber-impregnated metals or ceramics or carbon impregnated foam, titanium, aluminum or other metals, nylon, polyvinyl chloride or other plastics or resins, and the like. In one embodiment the tumbler  318  is provided with materials for adsorbing, absorbing trapping or dissipating moisture, oils, finely divided particles, and the like. In one embodiment fins, blades or surfaces of the tumbler  318  are designed to abrade away over time, and are formulated to include materials which may assist in conditioning, cleaning, polishing, or otherwise conditioning the coins. For example, dry silicon lubricants may be included in the formulation, or abrasives for assisting or polishing coins. In one embodiment the fins, blades or other projections are removable so that they can be replaced or changed in shape or materials, as desired, to improve mechanical action, abrasion, polishing or other characteristics, or if replacement is required because of wear. Even if the projections or surfaces of the tumbler do not impart an abrasive material, it is believed that some abrasive or polishing action of the coins against each other will be achieved. It is believed that a material that self-destructs or disintegrates over time not only indicates wear, but also can be used for imparting cleaning abrader to not only help clean the coins, but eventually clean transport mechanisms, hoppers, sensors, sorting and counting mechanisms and other mechanisms throughout the machinery. 
     A number of devices for accommodating rotation of the tumbler  318  can be used. The tumbler assembly may be supported by a pillow block  702  (FIG.  7 ), a roller-supported  704   a ,  704   b ,  704   c  end cap  706 , or may be provided with rollers or roller bearings  502   a ,  502   b ,  502   c , or a bracket engaging a race or annular recess  504 , or other bearing surface  708 . If desired, one or more rollers  502   a  may be pivotable or spring loaded  524 , e.g., to accommodate installation or removal of the cylinder  318 , e.g., for maintenance, repair, inspection, and the like. It is particularly desirable that the tumbler be configured for ease of removal so that it can be easily cleaned or replaced or jams may be cleared. 
     A number of devices may be provided for driving the rotationally-mounted cylinder. The cylinder may be coupled to a toothed pulley or gear  710 . The toothed pulley or gear  710  may be driven via a gear train or a toothed belt, such as a timing belt, coupled to a motor, such as an alternating current or DC gear motor. In the embodiment of FIG. 9, an alternating current gear motor  802  has a shaft that connects to a pulley  804  for driving a toothed belt  806 , which engages a pulley such as a toothed pulley  808 , coaxial with the perforated cylinder  810 . Suitable belts, motors or pulleys can be obtained, e.g. from SDT components company. 
     In one embodiment, materials which move through the perforations  326 , are received in a tray or other receiving area, preferably one which may be easily removed for emptying and/or cleaning  338 . Although in the embodiment depicted in FIG. 3 the tray  338  receives materials expelled from only the tumbler  318 , and a separate tray  343  receives materials which moves through the perforations of the tilting tray  1402 , if desired, a single tray or other receptacle can be provided for both purposes. 
     Preferably, the tumbler  318  or tumbler assembly is grounded appropriately to avoid static electric charge buildup, which could have the adverse effect of attracting certain non-coin materials to the drum. Conductive or non-static coatings or components may be used in constructing the drum  318 . Preferably all materials along the coin path and tumbler are conductive and grounded. In one embodiment, a multi-fingered conductive charge gatherer, similar to a Christmas garland, may be used to collect and/or dissipate static. 
     In one embodiment, the apparatus is configured to provide a flow of air or other fluid past the contents of the tumbler to assist in removing lighter and low-density non-coin material. Air flow devices may include a positive pressure device, a negative pressure or vacuum device, or both, although it is believed that a vacuum system may, in some environments, create an undesirable amount of noise. Preferably, in the case of a vacuum, a filter or filter bag is provided for capturing materials. Positive pressure air may be configured to pass through a filter on the feed end  342  of the tumbler chamber. In one embodiment, cleansed air is flushed through the system and additional air flow is used to dissipate moisture and heat. A suitable filtering system may be obtained from Nikro Industries, Villa Park, Ill. 60181. In one embodiment, a filter is used conforming to specifications: 88 inches of water lift, 95 cubic feet per minute, 1.25 horsepower, meeting MIL-F-51079 and MIL-F-51068B. An example is model number DC00288. 
     In one embodiment a low back-pressure air transfer system may be used. In this system, a fan is mounted adjacent the coin-exit end of the tumbler  344 , and a suction hose is positioned adjacent the coin-input end  342 . The intake end of the suction hose may be screened or filtered to avoid damage to fans or other devices that power of the suction. Preferably there is little back pressure in the system and a relatively large amount of air is moved through as the coins are tumbled. In one embodiment the perforated cylinder  318  is enveloped and sealed with a housing to assist in directing air flow in the desired counter-current direction  334 . The housing may be in the form of a semi-cylinder covering which seals with a waste removal tray  338 . Such a housing preferably also is useful in diminishing or deadening the noise of the tumbler device. 
     In one embodiment the system is substantially modular such as being contained, along with a feed tray  1402 , in a rectangular or other modular housing. Preferably the modular design is configured to accommodate retrofitting in devices which do not currently have a tumbler. For example, a device such as that depicted in FIG. 1 may be retrofitted by removing the rectangular housing depicted in FIG.  2  and replacing with the rectangular modular unit of FIGS. 8 through 11. In one embodiment the tubular tumbler is formed from two semi-cylindrical mating polyurethane components. 
     The present invention includes a number of features and embodiments. According to one embodiment, the invention includes a coin agitator for use in separating non-coin matter from coins for use in a coin counting device prior to transfer of said coins to a sensor mechanism of said coin counting device including a container with at least a first opening. In this embodiment, the coin agitator may include a tube. The tube may be movable by being rotatable substantially about its longitudinal axis. The tube may be perforated. A perforated tube may have a largest perforation size configured to prevent passage of a smallest desired coin. A plurality of projections may extend inwardly from a surface of said coin agitator. The agitator may include at least a first helical vane. The agitator may include at least a first fan configured for producing air flow through said coin agitator. 
     According to one embodiment, a coin conditioning apparatus for use in a coin discriminating may include a device for receiving a plurality of coins in a first region and for tumbling said received coins to assist in separating non-coin material; and a device for moving said coins through said receiving device. The apparatus may include a device for causing a fluid to flow through said receiving means during said tumbling. The apparatus may include a device for imparting a coin conditioning material into said plurality of coins. In one embodiment, said coin conditioning material is selected from the group consisting of a lubricant and an abrasive. In one embodiment, said coin conditioner is substantially modular to accommodate retrofitting. The apparatus may include a device configured to direct air flow in a direction counter-current to at least a first direction of coin movement. The apparatus may include a housing encompassing said coin conditioning device for reducing perceivable noise. The apparatus may include a positive pressure device for causing air flow through said coin conditioner. The apparatus may include a vacuum device for providing air flow through said coin conditioning. 
     In one embodiment, the invention provides a method for cleaning coins including: 
     introducing said coins into a rotatably mounted tube having sidewall perforations; 
     rotating said tube about its longitudinal axis to dislodge non-coin material; 
     moving coins in a first longitudinal direction through said rotating tube; and 
     flowing air through said rotating tube. 
     In light of the above description, a number of advantages of the present invention can be seen. The embodiment of FIGS. 13 through 21 is believed to particularly provide for thorough and efficient cleaning of coins while maintaining relatively high throughput, relatively low noise, and providing for ease of maintenance, replacement, inspection, and/or cleaning. This embodiment is useful in avoiding adhesion or slowing of coins along the depicted coin path by reducing or minimizing the potential for surface-to-surface contact of a coin with surfaces of the device. The device is relatively inexpensive to design, fabricate, construct, install and/or maintain, with many of the components being configured so that they may be formed by standard plastics or sheet metal fabrication processes such as stamping, drilling, injection molding and the like. Preferably the device is constructed with a shape, dimension and “footprint” that is compatible with earlier or in-service devices to permit ease of upgrading existing in-service devices, or ease of converting production facilities from production of existing devices, to production of devices according to the present invention. 
     The present invention provides an economical system and method for delivering clean coins to improve accuracy, durability and reliability of systems that identify, count, sort, discriminate and/or process coins and reducing jamming in input feed, transport and/or hopper devices. This system provides a system and method for self cleaning of a self-service coin processing device. The invention drives a tumbling mechanical agitation system for removing non-coin debris. The system reduces or eliminates the need for special-services such as continually stopping a coin-counting device in order to perform maintenance of the identification, counting, sorting or transport components. The system preferably provides for wear indicating components such as wear indicating inner fins or other projections inside a tumbler Preferably, the projections or other tumbler components are capable of imparting lubricants and/or abrasives or abrasive compounds. Preferably, the system provides a liquid or moisture removal system within the tumbler for removal of excess moisture or liquids, oils and the like, e.g., through an absorbent, adsorbent or desiccant component or feature of the tumbler fins or surfaces. In one embodiment, components are provided for dislodging or removing trapped items such as a floating or loose insert for dislodging items (such as a ball or other item which is too large to exit the exit hole) and/or finger rakes for dislodging trapped and/or dropped items. 
     A number of variations and modifications of the invention can be used. Although the invention is principally described as being useful in connection with cleaning coins, some or all features of the present invention can be used in connection with cleaning other types of devices such as regularly shaped items (e.g., golf balls), irregularly shaped items (such as screws, nuts, bolts, nails, and the like), and similar manufactured items. Although in one embodiment the device is controlled by a computer, other control devices can be used such as non-programmable or hard-wired control devices, application specific integrated circuits (ASICS), and the like. Although, in the above, items which are retained within the walls of the trommel are described as the objects to be cleaned and material passing through the holes in the walls of the trommel are described as “dirt,” the device can be used in the opposite fashion, i.e. to recover relatively small valuable objects that pass through the holes of the trommel walls and discarding the large objects retained within the walls of the trommel. Similarly, the device can be used to separate large objects from small objects, neither of which is to be discarded. 
     In the above description, a number of surfaces (such as the chute surfaces and trommel interior surfaces) are provided with features which are believed to assist in avoiding the slowing or stopping of coin movement or flow (such as may result from friction, adhesion, surface tension or the like). These features may include dimples, surface curvature, ridges, holes and the like, and are believed to operate by reducing or eliminating surface-to-surface contact between a coin face and a surface of the apparatus. In general, any or all of these features may be used on any or all of the apparatus surfaces that are coin-contact surfaces, such that, for example the first and/or second chutes may be provided with dimples or ridges (with or without the curvature described above), or the trommel interior surface may be provided with a degree of curvature (with or without the dimples described above.) 
     In addition to, or in place of, moving coins by providing a rotatable cylinder, other types of movement of the tubular or concave surface may also be used for moving or agitating the coins, such as a rocking or tilting motion, a swinging motion, a vibrating motion, and the like. Although, in one embodiment, a circular cross-section tumbler is depicted, other shapes may be used in this embodiment such as triangular, square, pentagonal, hexagonal, octagonal, or other polygonal cross-section tubing, conical or parabolic-sided or other tapering or flaring tubing and the like. In one embodiment it would be possible to provide a separation device which is U-shaped and, rather than being rotated  322 , is driven to swing through an arc or tilt in order to agitate the coins. While it is preferred to provide perforations in the tube of the concave surface, it is also possible to provide an embodiment in which a tube or concave surface is unperforated, and air flow is used for removing materials dislodged during tumbling, e.g., when only lightweight or low-density contaminants are anticipated. If desired, the vanes, fins or other agitating/moving devices may be separate from or movable with respect to the tubular or concave surface. It is possible to rotate or otherwise move the fins relative to either a fixed or rotating tube, including rotating the tube and fins in opposite directions. If desired, the tubular or concave surface and/or the projections may be coated with or may incorporate substances or surfaces to assist in cleaning, polishing or otherwise conditioning the coins, such as absorbent or adsorbent materials for removing liquids, oils, finely divided particles, and the like, or materials for transferring lubricants, abrasives, polishing compounds, and the like, to the coins. The tubular or concave surface or projections may incorporate or provide materials for reducing friction, avoiding static electric charges, avoiding corrosion, and the like. The tumbler and/or housing may be made from or may include anechoic, sound-deadening and/or anti-static material. The drum, internal vanes, etc. can be connected to a transmission and/or speed reducer that is computer controlled, e.g. to adjust tumbling speed based on sensed temperature, humidity, load weight, and/or in-feed or out-feed rate, or to suspend out-feed, e.g. in response to a sensed jam or other malfunction. If desired, a flow of air or other gases or, if desired, liquids, aerosols, mists, gels, and the like, may be introduced, preferably in a counter-current fashion with respect to the coin flow, to assist in conditioning the coins, e.g. by removing non-coin objects, especially small or lightweight non-coin matter such as hair and dust. A pressurized air and/or vacuum system may be used for causing such flow. If desired, filters may be provided for trapping some removed materials. In one embodiment, a cylindrical body having vanes rising from the inner diameter and a plurality of openings is used. If desired, it would be possible to construct a device in which the perforated surface is maintained stationary, and a separate screw drive or other drive agitates and moves the coins to or across the stationary surface. 
     Although the invention has been defined by way of a preferred embodiment and certain variation modifications. other variations and modifications can also be used.