APPARATUS AND METHOD FOR TERMINATING COIN SORTING

Abstract: The invention relates to a coin sorter apparatus for sorting a group of mixed coins (11) by denomination and automatically terminating the sorting process in response to a sensed operating parameter. Sorting is provided by a stationary disc (21) and a rotating disc (19) positioned sufficiently proximate to one another so that when the group of mixed coins (11) are dropped into the centre opening of the stationary disc (21), they are rotated by the rotating disc (19) and guided by the stationary disc (21) on a radially outward spiral sorting path which exits each denomina­ tion of the coins at discrete locations (49) along the periphery of the stationary means. As the coins (11) are sorted, a sensing means (69) provides signals indicating the presence of a pre­ determined condition. A bridge guide (71) and a diverter guide (72), which are part of the stationary disc (21), are responsive to the signals from the sensing means (69) to redirect the radially outward sorting path of the coins (11) to a radially inward path so as to terminate the sorting process. Optionally, a circuit respon­ sive to the sensing means (69) controls the application of power to the motor (37) powering the rotating disc (19) of the sorter apparatus and cuts off that power, when the sorting process is terminated in order to prevent abrasion of the re-circulating coins or damage to the sorter apparatus.

Description: The present invention relates generally to an apparatus and method for sorting coin currency by denomination and, more particularly, to an apparatus and method for sorting coins by denomination which stops the sorting process in response to a sensed predetermined condition. Some businesses, particularly banks, are often faced with large amounts of coin currency at the end of a business day, week or month which must be organised, counted and recorded. To hand count and record large amounts of coins of mixed denominations require diligent care and effort and demands much manpower time that might otherwise be available for more profitable and less tedious activity. To make counting of coins less laborious, machines have been developed which automatically sort by denomination a mixed group of coins. In US Patent Specification No. 4234003 there is described a coin sorting apparatus in which coins are fed onto the center of a rotating disc having a flexible surface. An annular guide plate is positioned over the disc, being open in the center for receiving coins, and extending outward to the peripheral edge of the disc. The underside of the guide plate is formed with a peripheral stop extending around approximately half of the disc, and a series of discrete radiused guides extend over portions of the other half of the disc. The first of the series of guides would have an outer edge differing in radius from the peripheral stop by the diameter of the smallest coin to be sorted and each succeeding guide would have a progressively smaller radiused outside edge defined by the difference between coins to be sorted by succeeding guides. In US Patent Specification No. 2977961, there is disclosed electromagnetically operated gate means to stop coins from travelling to the sorting stations. These gate means are provided to take care of a situation where it might be desirable to stop the sorting while coins are still on the disc. British Patent Specification No. 2060970 discloses coin counter means for providing a drive motor switch-off signal in response to the counting of a predetermined number of coins. Without the ability to control the automatic sorting process, the machine user must remain in the vicinity of the machine during its operation to ensure the machine can be stopped in case of a malfunction. In addition, the user must remain near-by in order to remove filled receptacles of sorted coins. It is the primary object of this invention to provide an improved coin sorter mechanism which is capable of automatically sorting and counting coins at a high speed and quickly terminating the sorting process when a predetermined condition has been sensed. It is a related object of this invention to provide a mechanism which automatically stops sorting coins when a coin receptacle is filled with a predetermined number of coins without the need for manually stopping the coin sorter mechanism. It is also an object of the invention to provide a coin sorter apparatus which can be safely left for unattended operation without any danger of receptacle overflow, jamming of the apparatus or excessive coin abrasion. It is still another object of this invention to provide a coin sorter apparatus which stops the movement of coins through the sorting mechanism in a simple and reliable fashion in response to a predetermined condition that can be represented by an electrical signal. It is yet another object of this invention to provide a coin sorter mechanism which satisfies the foregoing objects and whose size allows it to be easily and conveniently placed in the work space of most businesses. Other objects and advantages of the invention will be apparent from the following detailed description. According to the present invention there is provided an apparatus for sorting coins of different denominations, said apparatus comprising: a rotatable disc having a resilient surface; a stationary disc having a surface that is substantially parallel to said resilient surface and positioned sufficiently close to said resilient surface so that at least portions of the stationary surface press any coins in contact therewith into the opposed resilient rotatable surface so that the resiliency of the rotatable surface urges the coins against the stationary surface with sufficient pressure to prevent radial movement of the coins by centrifugal force due to rotation of the rotatable member, while permitting circumferential movement of coins by rotation of the rotatable member; selected areas of the surface of said stationary disc being configured to (a) guide coins in a single file along an arcuate path between the discs, and (b) sort coins of different sizes by causing the coins of each different size to exit from between the discs to a different predetermined position around the periphery of the stationary disc; and means for providing a signal indicative of the presence of a predetermined condition; characterized in that said selected areas include: gating means movable in response to said signal between a first, lower, position in which coins are permitted to escape from between the discs and a second, raised, position in which the escape of coins is prevented and means movable vertically in response to said signal between a first, raised, position in which coins are permitted to enter said arcuate path and a second, lowered, position in which coins are blocked from entering said arcuate path to inhibit backlogging of coins. The invention relates to a coin sorter apparatus for sorting a group of mixed coins by denomination and automatically terminating the sorting process in response to a sensed operating parameter. Sorting is provided by a stationary disc and a rotating disc positioned sufficiently proximate to one another so that when the group of mixed coins are dropped into the centre opening of the stationary disc, they are rotated by the rotating disc and guided by the stationary disc on a radially outward spiral sorting path which exits each denomination of the coins at discrete locations along the periphery of the stationary means. As the coins are sorted, a sensing means provides signals indicating the presence of a predetermined condition. A bridge guide and a diverter guide, which are part of the stationary disc, are responsive to the signals from the sensing means to redirect the radially outward sorting path of the coins to a radially inward path so as to terminate the sorting process. Optionally, a circuit responsive to the sensing means controls the application of power to the motor powering the rotating disc of the sorter apparatus and cuts off that power, when the sorting process is terminated, in order to prevent abrasion of the re-circulating coins or damage to the sorter apparatus. Embodiments of the present invention will now be described,by way of example, with reference to the accompanying drawings in which:- Fig. 1 is a cross-sectional view of a coin sorter apparatus which can utilize the coin sorter apparatus according to the invention; Fig. 2 is a full sectional view of the stationary disc of the coin sorter apparatus taken along the line 2-2 in Fig. 1 showing the position of the guide elements of the recycle mechanisms according to the invention; Fig. 3 is a partial sectional view of the coin sorther apparatus taken along the line 3-3 in Fig. 1 showing the top of the stationary disc partially sectioned to expose the rotating disc beneath it and also showing the recycle mechanisms which control the guide elements; Fig. 4 is a cross-sectional view of the first recycle mechanism taken substantially along the line 4-4 in Fig. 3; Fig. 5 is a cross-sectional view of the second recycle mechanism taken substantially along the line 5-5 in Fig. 3; Fig. 6 is a full sectional view of the stationary disc of the coin sorter apparatus taken along the line 2-2 in Fig. 1 showing the position of the guide elements of the recycle mechanisms according to an alternate embodiment of the invention; and Fig. 7 is a cross-sectional view of the first guide element in the alternate embodiment of the stationary disc taken along the line 7-7 in Fig. 6. Although the invention will be described in connection with certain preferred embodiments, it will be understood that it is not intended to limit the invention to those particular embodiments. On the contrary, it is intended to cover all alternatives, modification and equivalents that may be included within the spirit and scope of the invention as defined by the appended claims. Referring first to Fig. 1, a coin sorter machine is shown which might utilize the coin sorter apparatus according to the invention to rotate coins in an outwardly spiral orbit and eject each different denomination of coin from the sorting apparatus at a different selected location into a receptacle. To start the sorting process a collection of mixed denomination coins 11 is dropped onto a staging platform 13 which is an integral part of a housing cover 15. The coins 11 are manually pushed along the gentle sloping incline of the staging platform 13 and fall into a hopper 17 as indicated by the arrows in Fig. 1. The coins are directed by the hopper 17 into the coin sorter apparatus which comprises a rotating disc 19 and a stationary disc 21, shown in cross-section in Fig. 1. The stationary disc 21 contains recesses and ridges on its bottom surface whose purpose will be explained in greater detail in connection with Figs. 2-7. A resilient pad 19a provides the top surface for the rotating disc 19. This pad 19a is firmly secured to the disc 19 and, therefore, rotates along with the disc 19 about its centre axis 20. Because the rotating disc and stationary disc are held closely together, coins which rotate on the resilient pad 19a are brought into the region between the discs and selectively pressed into the pad by the stationary disc's ridges. As a result of the manipulation of the coins by the ridges and recesses, the rotating coins are selectively allowed to move outwardly to the disc periphery in response to centrifugal force. Each denomination of coin reaches the periphery at a different location relative to the stationary disc. Therefore receptacles can be fixed at these locations to catch the sorted denominations. Since coins are alternately pressed into and released from the pad, the pad 19a should be a rubber composition with a resilience of about 30 to 35 durometers. The stationary disc may be formed by machining a preheated steel core and then surface treating the disc for additional hardness by a well known gas nitriding process. Support for the sorter apparatus is provided by a base 23 which has an opening 23a that receives a drive shaft section 19b of the rotating disc 19. To allow the rotating disc 19 to turn relative to the stationary base 23, a bearing 25 is fitted between the shaft section 19b of the rotating disc 19 and the opening 23a of the base 23. To relieve the bearing 25 of the weight of the coin sorter apparatus and to prevent cantilevering of the bearing, a collar and support plate 24 are mounted at the bottom mouth of opening 23a. A drive shaft 26 with a slotted key 28 extends from the drive shaft section 19b of the rotating disc through the collar and support plate 24. To turn the drive shaft 26 a pulley 33 is attached to the drive shaft bottom end. The pulley 33 is connected by a belt 35 to a motor 37 which also has a pulley 39 at the end of its drive shaft. The belt and pulley drive acts like a clutch mechanism by allowing the belt to slip on the pulley in the event that coins jam between the rotating disc 19 and the stationary disc 21. To facilitate maintenance and repair, the housing cover 15 is hinged to the base 23 by hinge 27 and the stationary disc 21 is attached to the base 23 by way of hinge 29. On the opposite side of the stationary disc from the hinge 29 is a support structure 31 which supports the stationary disc 21 in horizontal alignment over the rotating disc 19 and also provides a handle to lift the stationary disc 21 about the pivot 29. The support structure 31 and pivot 29 also fix the vertical position of the stationary disc 21, holding it close to the surface of the resilient pad 19a but not touching it. This avoids any possibility of degradation of the resilient pad surface through frictional wear against the stationary disc. As can be seen in the cross-section of Fig. 1, the stationary disc 21 has a central opening 41 which exposes a portion of the resilient pad 19a such that coins dropped from the hopper 17 land on the resilient pad 19a of the totating disc 19. Because the coins tend to move on the rotating disc in a spiraling orbit, the central opening 41 is cicular in shape in order to allow for this natural movement. To prevent bunching of the coins in the centre of the exposed portion of the resilient pad 19a, a conical projection 43 is secured by a screw 45 to the rotating disc 19 at the rotational centre of the disc. When the coins are dropped onto the exposed central surface portion of the rotating disc 19, they react to the centrifugal force imparted on them by the rotating disc by moving toward the annular side wall of the central opening 41 cut in the stationary disc 21. Simultaneously and in combination with this outward movement the coins are carried by the rotating disc 19 in an orbit about the disc's rotational centre. Together these movements describe an outwardly spiraling orbit as viewed from the perspective of a stationary observer. When a coin's edge reaches the annular side wall of the central opening, its outward movement is restrained by the wall. The annular side wall of the central opening includes a recess which allows single coins, but not multiple layered coins, to slide under the stationary disc. As will be explained in greater detail in connection with Fig. 5, coins which slide into the recess are captured between the two discs by a series of ridges and recesses in the stationary disc and are guided by these ridges and recesses to predetermined destinations which are different for each coin denomination. Due to co-operation between the resilient surface of the rotating disc and the ridges and recesses of the stationary disc, the coins' radial movements are, in part, guided by alternately pressing the coins into the rotating disc and releasing them as the rotating disc carries the coins in an orbit under the stationary disc. As a complement to this, edges composed of junctions between ridges and recesses guide the coins in their orbit by creating barriers to the radial movement of the coins. The recesses and ridges of the stationary disc are strategically positioned along the rotational path of the coins so as to utilize the centrifugal force imparted on the coins by the rotating disc in such a way as to sort the coins by denomination. A useful way to describe the functional interrelationship of the rotating disc and stationary disc is to view the stationary disc as a guiding mechanism. If the stationary disc were removed from its position proximate to the surface of the rotating disc, coins placed on the rotating disc would exhibit an orbit path having a constant radial component as a result of the unhampered centrifugal force acting on the coins. As a result the coins would be flung off the rotating disc surface in a haphazard manner. The stationary disc serves to controllably guide the radial movement of the coins and thereby impart to the coins a controlled orbit which steadily increases in radius. While on route in this controlled outwardly spiraling orbit or arcuate path, the coins are sorted by the guiding action of the stationary disc. Each area of ridges and recesses in the stationary disc guides the coins in a particular manner to prepare the coins for the journey to and manipulation by a following area of ridges and recsses. Guiding is provided by an edge or side wall defined by a combination of a ridge and recess which serves as a guide surface for the edges of the coins which are urged against the side wall by centrifugal force. By selective guiding of the coins by the stationary disc, the coins are carried in an outwardly spiral orbit on the resilient surface of the rotating disc which segregates the coins by denomination. As the coins are carried on the rotating disc their path comprises two well defined movements between the surface of the stationary disc and the rotating disc. If the coins are kept pressed into the pad by the ridges and recesses of the stationary disc, the coins will not move radially under the influence of centrifugal force but will be carried on the resilient pad at a constant radius to define a circular orbital path about the centre of the rotating disc. If during their orbit the coins are brought into a recess in which the coins are not pressed into the pad, the coins will move outwardly on the pad in response to centrifugal force, thus giving the coin orbit a radial component which moves the orbit farther out from the disc centre until the orbit's radial component is met by an edge of a ridge-recess combination in the stationary disc. As long as the coins are not pressed into the resilient pad 19a they will remain against the stationary disc edge as they continue to orbit. In short, the recesses and ridges in the bottom surface of the stationary disc take advantage of the natural movement of the coins as they orbit to position the coins at particular disc radii which align their orbits so that recesses in the stationary disc encountered by the rotating coins will selectively exit the coins from between the two discs. Referring now to Fig. 2, the ridge region 53 occupies a large portion of the surface of the stationary disc facing the resilient pad 19a. The ridge region 53 is parallel with the resilient pad 19a, and sufficiently proximate to its so that coins of all denominations are pressed into the pad when they pass under the ridge region 53. As long as a coin is pressed into the pad it will be carried on the pad at a fixed location and will rotate under the recesses and ridges of the stationary disc at a constant radial position as determined by the last recess in which the coin was allowed to move radially. To facilitate an understanding of the coin movement, the full sectional view -f Fig. 2 has been taken through the ridge region 53 of the stationary disc such that the cross-hatched area in Fig. 2 serves as a reference plane for the recesses in the disc. The non-cross-hatched areas of the stationary disc correspond to recessed areas of various depths. Also to facilitate understanding of coin movement, adjoining recesses with related depths have been designated with the same numeric identifier and an individual alpha identifier (e.g., 49, 49a, 49b 49c). As mentioned in connection with Figure 1, to begin its journey, a coin is dropped from the staging area 13 and hopper 17 onto the resilient pad 19a of the rotating disc 19. As can be seen in Fig. 2, the stationary disc 21 has a recess 49 which first receives the rotating coins on the rotating disc 19 under the surface of the stationary disc 21. In order to insure that two coins layered together do not enter the recess 49, the recess is only deep enough to accept the thickest coin. As the coins are accepted into the recess 49 they are being carried on the pad surface in an orbit about the centre of the rotating disc while simultaneously moving radially over the pad surface toward the disc periphery. Radial movement of the coins is limited by the outer edge 51 of the recess 49. As the rotating disc 19 rotates under the stationary disc the coins are carried through the recess 49 to recess 49a. Recess 49a has approximately the same depth as recess 49, and therefore has a depth sufficient to not press the coins into the resilient pad 19a. consequently the coins can move radially to the edge 51a which cams the edge of the coin to guide the coin along the recess 49a. At this point, with portions of ridge 53 on either side of recess 49a, the recess and ridge form a channel which captures those coins which have been guided by edge 51. To ensure larger diameter coins do not get stuck against the inside edge of the recess (because of the slight wedging action caused by the recess edges being slightly less than vertical), the inside edge of recess 49a includes a bulged area 52. This bulged area gives enough room in the recess 49a for the larger diameter coins to succumb to the centrifugal force and move to the outside edge 51a of recess 49a. If a coin is not properly aligned by the edge 51 before it approaches the entrance to recess 49a, it will be intercepted by a segment 53a of the ridge 53. Ridge 53a presses the coin into the resilient pad 19a and prevents the coin from moving radially. The coin thus moves with the rotating disc under ridge 53a in a circular counterclockwise arc to where ramp 69 releases the coin into region 49 again; as described previously, recess 49 releases the coin from pressed engagement with the pad so that the coin is free to move radially toward edge 51. The coin released by ramp 69 will move radially outward under the influence of centrifugal force and will be guided by edge 51 which directs the coin movement into recess 49. Now the coin is on the correct path to properly enter recess 49a. In the recess 49a the coins are in a single file and are guided by edge 51a which adjusts the radial position of the coins. At the end of recess 49a the coins are pressed into the resilient pad 19a by a wedge 63 which is an incline bridging the depth level of recess 49a with the ridge 53. As the coins are carried by the rotating disc 19, the coins are steadily pressed into the resilient pad 19a as the rotating coins are moved under the gradual incline of the wedge 63. Further movement of the coins on the rotating disc 19 brings the coins partly under a recess 49b. Because a coin of relatively small diameter may not be caught by the ridge 53a and yet may be misaligned in the recess 49a, recess 49b provides a path to return these misaligned coins to the centre of the resilient pad 19a for recirculation. Coins adjacent to a misaligned coin could prevent the misaligned coin from moving out radially to meet the outer edge 51a of the recess 49a. If this misalignment were not correct, the coin could be led into the recess 65 at a misaligned radial position which could result in the coin improperly exiting from one of the recesses 67a-67e or possibly not exiting at all and jamming the machine. As correctly aligned coins leave recess 49a they will be pressed into the pad by the wedge 63 and ridge 53b, and they will be kept pressed into the pad by the ridge 53c as they pass under recess 49b. Since the coins are pressed into the pad, they cannot move radially in response to centrifugal force. Instead the coins follow a path of constant radius. Even though the correctly aligned coins pass partly through recess 49b, some portion of each coin is always in contact with the ridge 53, 53b or 53c (the cross-hatched area). Accordingly, the coins are pressed into the resilient pad throughout their journey past recess 49b. As the coins are held pressed into the pad by the ridge 53, the coins rotate along a constant-radius arc into recess 65. As misaligned coins leave recess 49a they will also be pressed into the resilient pad 19a by wedge 63 and held in pressed engagement with the pad by the ridge 53b. Since misaligned coins are located at a radial position spaced inwardly from that of correctly aligned coins, the outer edges of such coins do not stay under ridge portion 53c. Therefore, the misaligned coins are released from a pressed engagement with the resilient pad 19a by the recess 49b. Although most of the recesses have bottom surfaces which are approximately parallel with the resilient pad 19a, the recess 49b is slightly angled (e.g., 5-1/4 degrees) with respect of the pad surface. Such an angle allows misaligned coins to ramp up the recess and away from pressed engagement with the pad. When the leading edges of misaligned coins hit the extension of the wall 51 in recess 49b, they are sufficiently free from pad pressure to move radially inwardly. The edge 51 of the recess 49b guides the coins back into recess 49 for another attempt at proper alignment within recess 49a. Any coin denomination of a diameter less than the width of the recess 49a can experience the problem of misalignment. In practice, the larger the diameter of a coin, the less likely the coin is to be misaligned in recess 49a. In fact, experience indicates that only small diameter thin coins, are misaligned in recess 49a. Nevertheless, coins which have a diameter greater than the width of recess 49b, yet small enough to be misaligned in recess 49a, such that their radially outside edges are located inwardly of ridge 53c, can also be guided by recess 49b back to recess 49. Even though part of the coin remains under ridge 53b (because of its diameter being larger than the width of recess 49b) the coin's leading edge meets edge 51 which successfuly guides the coin radially inwardly. It can occur that correctly aligned coins passing under recess 49b can be slightly shifted in their radial position. To correct this, correctly aligned coins pass recess 49b and enter recess 65 which allows the coins to be realigned against the radially outer edge 70 of the recess 65. Recess 65 and edge 70 allow the coins in the sorting path an opportunity to realign their outer edges at the radial position required for correct sorting. From the recess 65 the pad rotation carries the radially correctly aligned coins into an area of the stationary disc which has a series of recesses 67a-67f for allowing properly sized and positioned coins to exit from between the discs. Each of the recesses 67a-67f acts as an axit chute for a particular coin denomination by releasing that particular coin from pressed engagement with the pad 19a. After the coins have been released from the pad, they are free to move radially along the recess and exit into a coin receptacle. Since all denominations have their outer edges guided to the same radial position by edge 70, it is only the coin inner edge which is at a unique radial distance for each denomination. Therefore, the associated recesses 67a-67f which allow the different coins to exit from between the discs must be arranged on the stationary disc so that the coins pass under them in an order of ascending width. To accomplish this, the recesses 67a-67f are aligned in a counterclockwise order of ascending width. In order to sense the coins leaving the recess 67a-67f and thereby keep an accurate count of the sorted coins in each receptacle, a series of counters 69a-69f are positioned at the periphery of the stationary disc 21 and proximate to each opening for recesses 67a-67f. Each counter may consist of a well-known counting device, such as a conventional quenched oscillator. When any of the counters 69a-69f reaches a predetermined count, gating means in the form of a retractable bridge guide 71, positioned between recess 65 and recess 67a, can be raised from a first position to a second position wherein the rotating coins are caused to be recirculated radially inwardly back to the centre opening of the stationary disc 21. When all the counters 69a-69f are at less than a predetermined count, the retractable bridge 71 is in its first position which allows coins to pass under the bridge unobstructed, thereby allowing the sorting function to operate. Bridge guide 71 is an insert in recess 49c which is substantially the same as recess 49b except that with the bridge guide 71 in its raised position, all coins in the sorting path are intercepted by the recess. By placing the bridge guide 71 in its raised position, the radial extent of the recess 49c is increased to a point past the radial position of the circumferential sorting path of coins exiting recess 65 and approaching recesses 67a-67f. As indicated by the coins represented in recess 49c, and as explained in connection with recess 49b, coins of all diameters are capable of being re-circulated by the recess 49c. The bridge guide 71 in Figure 1 has a flat bottom surface which occupies a co-planar position with edge 53 when in its lowered position. Coins passing under recess 49c when the bridge guide is in its lowered position will not be moved radially inwardly since the bridge guide 71 holds the coins in pressed engagement with the resilient pad and prevents the coins leading edges from ramping along the slope of the recess 49c into engagement with edge 51. As the arrow indicates in Fig. 2, the recess 49c when the bridge guide 71 is in its raised position, redirects coins away from the sorting path to the recess 49 and toward the central area of the stationary disc 21. In accordance with an important aspect of the invention, a retractable diverter guide 72 in the stationary disc 21 can be lowered or raised between two positions and is located proximate to the mouth of recess 49a so as to prevent coin jamming in the sorter apparatus when the bridge guide 71 is activated. When the bridge guide 71 is activated and raised, diverter guide 72 is simultaneously activated and lowered. When bridge guide 71 is moved into its raised or activated position, so as to redirect coins radially inwardly, the redirected coins tend to slow as they crowd into the centre of the stationary disc. Since the coins have been inwardly redirected they have added a inwardly radial component to their motion vector and reduced their circumferential component. Since a redirected coin must overcome the outwardly radial centrifugal force imparted by the rotating disc 19, the inwardly radial component of motion does not totally compensate for the reduced circumferential motion. Consequently, the redirected coins tend to slow down in recess 49c. If coins continue to enter recess 49a at a rapid rate, backlogging and eventual jamming of the sorter apparatus may result. In its lowered position, diverter guide 72 blocks coin access to recess 49a, thus preventing more coins from entering the sorting path and possibly backlogging at recess 49c and jamming the sorter apparatus. The bridge guide 71 and diverter guide 72 are moved between their raised and lowered position by solenoids 75 and 77 positioned on the top surface of the stationary disc 21 as shown in Fig. 3. In order to stop the sorting process and re-circulate the coins to the central area of the stationary disc, the plungers 75a and 77a, by way of linkages 79 and 80 respectively, raise the bridge guide and lower the diverter guide. Both solenoids are responsive to the counters 69a-69f or other sensing devices so as to energize their coils and pull in the plungers when any of the counters indicates a full receptacle or when other sending devices respond to a predetermined condition. Each of the recycle mechanisms, which includes a solenoid, linkage and guide combination, is shown in cross-section in Figs. 4 and 5 to better illustrate the inter-connection of the combination. Bridge guide 71 in Fig. 4 and diverter guide 72 in Fig. 5 are shown in the positions in which they are held by an activated solenoid. Bridge guide 71 is held in a raised position so as to radially extend the recess 49c to capture all coins travelling along the sorting path. Diverter guide 72 is lowered so as to block all coins from entering the sorting path by way of recess 49a. In order to ease tolerances and yet assure proper performance of the bridge guide 71 and diverter guide 72, the bevelled surfaces 71a and 72a, on the bridge guide and diverter guide respectively, provide leading edges for the guides which will not act as an edge if the guides are slightly vertically misaligned. That is, since the bridge guide 71 might not necessarily be perfectly co-planar with ridge 53 when in its lowered position, and since diverter bridge 72 might not necessarily be perfectly co-planar with recess 49 when in its raised position, the bevelled leading edge assures there is no right angle edge which might be lower than the surrounding stationary head ridge or recess and therefore act as a guide edge which diverts coins instead of allowing them to pass unchanged. Connecting the bridge guide 71 to the plunger 75a is the linkage 79 composed of a rod 83, a rocker arm assembly 85 and an arm 87. The rocker arm assembly 85 has one end coupled to the head portion 87a of the arm 87. A leaf spring 89, secured to the surface of the stationary disc, is positioned over a central platform area 87b of the arm 87. The bottom of the arm is threaded to the bridge guide 71 through a bushing 91 which allows the arm 87 to move vertically. When the solenoid 75 is unenergized, the leaf spring 89 holds the bridge guide 71 in its lowered position. Activation of the solenoid 75 moves the plunger 75a to the right in Fig. 4, thus causing the linkage 79 to pull the arm 87 and the attached bridge guide 71 up to the guide's raised position. In a similar manner, the diverter guide 72 in Fig. 5 is moved by a solenoid 77 and a linkage 80. To hold the diverter guide 72 in a raised position when the solenoid is not activated, a coil spring 93 is positioned around an arm 95 which is threaded to the diverter guide 72 at its lower end 95a and topped by a flattened head at its upper end 95b. The coil spring 93 is compressed between the flattened head and the stationary disc 21. An adjustable stop 96 limits the stroke of the arm 95 in a bushing 97. It will be appreciated that the solenoids 75 and 77 can be activated by signals other than those from counters 69a-69f. For example, in certain applications it might be desirable to terminate sorting in response to a signal representing 1) a surge in motor current indicating the jamming of the sorter apparatus, or 2) the accumulation of a preselected weight of coins in a receptacle. Depending on the application, many other parameters of the sorter apparatus and function could also possibly control termination of the sorting process. In accordance with another important aspect of the invention, the rotating disc is also responsive to a predetermined condition, such as the counters 69a-69f reaching a predetermined count, to stop rotation of the rotating disc so as to prevent damage of the sorter apparatus or excessive wear to the coin surfaces when the recycle mechanisms have placed the coin sorther in a re-circulation mode. Terminating the rotation of the rotating disc 19 can be accomplished in a number of ways, one of which is to connect a relay 74 in the power line to the motor 37 which is responsive to a sensor, such as the counters 69a-69f, to remove power from the motor. Restarting the motor and sorter apparatus is accomplished simply by resetting the relay. Preferably, activation of the relay by the counters 69a-69f or other sensors is not simulatneous with activation of the bridge guide 71 and diverter guide 72, since one or two rotations of the rotating disc 19 after activation of the guides will ensure cirtually all coins have been re-directed out of the sorting path and back to the centre of the stationary disc. To accomplish this delay in the activation of the ralay 74, and to also automatically reset the relay after a lapse of a predetermined time period, a timer circuit 76 is provided which may be composed of conventional analog and/or digital circuits (e.g., astable multivibrators or binary counters respectively). When a predetermined number of any coin denomination is received into a receptacle, the associated one of the counters 69a-69f provides an activation signal to the timer circuit 76 and to the solenoids 75 and 77 which immediately raise and lower the bridge guide 71 and diverter guide 72, respectively. After a small time delay (preferably 330 milliseconds) determined by the timer circuit 76, the relay 74 is energized. After activation of the relay 74, the timer circuit 76 measures a period equal to the maximum time for the rotating disc 19 to coast to a stop. Since at the end of this period of time (preferably 4 seconds), it is certain that the disc 19 is no longer rotating, the timer circuit 76 removes the activation signal from the relay 74 thus causing the solenoids to de-energize and the bridge and diverter guids to return to their previous positions. By automatically de-energising the solenoids at the earliest safe opportunity, the solenoids are safeguarded from possibly burning out if the sorting apparatus is not attended to soon after a receptacle is full and the motor de-energized. Although de-energization of the motor 37 by relay 74 and timer circuit 76 is described in connection with a signal from counters 69a-69f, the motor may be responsive to many other predetermined conditions as mentioned above. In addition, termination of coin rotation could be accomplished in other ways than de-energizing the motor 37. For example, a clutch and brake assembly could be responsive to the relay 74 to stop the rotation of the rotating disc 19. Referring to Fig. 6, an alternate embodiment of the stationary disc 21 is shown utilizing the recycle mechanisms of a bridge guide 111 and a diverter guide 113. In the currency of some countries, coins of different denominations may have similar diameters and different thickness. The stationary disc 21 in Fig. 6 utilizes thickness, as well as diameter,as a discriminating parameter to sort coins of a currency having one coin denomination of greater thickness but similar diameter as another denomination. In comparison, the stationary disc 21 in Fig. 2 sorts coins by diameter only. Since coins which are sorted by diameter are guided in substantially the same manner in both the stationary disc 21 in Fig. 6 and the stationary disc 21 in Fig. 2, only the sorting path of a coin sorted by thickness will be described in detail. All coins are accepted into the region between the stationary and rotating discs by recess 115. Since recess 115 is deep enough to accept the thickest coin, it may sometimes happen that the thinnest denomination coins are stacked on one another in the recess. To ensure a single layer distribution of all coins, a wedge 117 leading to a slightly shallower recess 119 sweeps the tops of all coins entering the recess 119 so as to remove stacked or shingled coins. The recess 119 is sufficiently shallow so as to allow only a single kayer distribution of thin coins to enter the recss directly from the central open area of the stationary disc 21. Because of the shallowness of the recess 119, the thick denomination coin cannot directly enter the recess 119 from the centre of the stationary disc. Instead, it must first enter the recess 115 and then be eased into the recess 119 by the wedge 117. From the recess 119 the coins are transferred to a deeper recess 121 by way of a ramp 123. A circumferential extension 119a of the recess 119 ensures that stacked or shingled coins in the centre of the stationary disc do not find their way into the recess 121. A single file circumferential sorting path is created by the recess 121 as it guides the coins to a wedge 125. Coins of all thicknesses and diameter are radially aligned by the edge 127 which positions the outer edges of the single file coins. In a manner similar to the stationary disc 21 in Fig. 2, misaligned coins approaching the recss 121 are captured by an extension 127a of a ridge 127 and pressed into the resilient pad 19a so as to be rotated along an arc of constant radius which re-circulates the misaligned coins back to the recess 115 by way of a recess 129. From the wedge 125, coins are pressed into the resilient pad 19a by a ridge section 127b. All coins correctly radially aligned in the recess 121 will stay in pressed engagement with the pad as they pass under the bridge guide 111 and the associated recess 131. As with the bridge guide 71 in Fig. 2, the bridge guide 111 in Fig. 6 is moveable between a raised and lowered position so as to bridge the recess 131 in its lowered position and to expose the radially outer portion of the recess in its raised position. In its raised position, the bridge guide 111 co-operates with the recess 131 to duplicate the function of recess 49c in Fig. 2. The particular shape of the bridge guide 111 is dictated by practical considerations of construction. Because of the spacing requirements of the recesses and ridges in the stationary disc 21 shown in Fig. 6, the recess 131 must provide the functions of both recesses 49b and 49c in the stationary disc of Fig. 2. For the bridge guide 111 to allow the recess 131 to re-circulate misaligned coins when it is in its lowered or bridging position, it must not extend more radially inwardly than the ridge 53c in Fig. 2. Because of the practical problem of maintaining sufficient room for positioning a solenoid and its associated linkage on the top of the stationary disc and because the connection between the bridge guide 111 and the linkage requires a guide of a minimum width in order to properly connected the guide to the linkage, the bridge guide 111 must also be of a minimum width. To accommodate these requirements, the bridge guide 111 is composed of two sections 111a and 111b. Section 111a is the portion of the bridge guide 111 which is parallel with the surface of the resilient pad 19a and, when the bridge guide is in its lowered position, is co-planar with the ridge 127. Section 111b is co-planar with the recess 131 when in its lowered position. In its lowered position, the bridge guide 111 co-operates with recess 131 to duplicate the function of the recess 49b in Fig. 2. If not for the considerations mentioned above, the bridge guide 111 would preferably only include section 111a. Section 111b would be a fixed part of the recess 131. Referring to Fig. 7, a cross-section of the bridge guide 111 in its lowered position shows the first section 111a co-planar with the ridge 127. The second 11b is flush with the recess 131 and thereby forms a radial extension of the recess. As indicated by coin C, correctly aligned coins are kept in pressed engagement with the resilient pad 19a as they pass under the bridge guide 111. A rod 149 is shown in Fig. 7 which serves to connect the bridge guide 111 to a solenoid and linkage assembly on the surface of the stationary disc 21 in a manner similar to that shown in Fig. 4. Correctly aligned coins are pressed into the resilient pad 19a so as to describe an arc of constant radius as they are rotated, from the ridge section 127b, under the lowered bridge guide section 111a and ridge section 127c and onto the ramp 133. Because the ramp 133 is angled with respect to the rotating path of the coins, there is a slight radially outward urging of coins passing under the recess. This radial urging of the coins helps them realign against the edge 135 of the recess 137 and thereby compensate for any slight radial movement which might have occurred while passing under the bridge guide 111. In order to sort coins by their thickness, the recess 137 is deep enough to allow all but the thickest denomination coin to move radially within the recess. The thickest coin is pressed into the resilient pad in the recess 137 and held at a fixed radial position. The other thinner coins are free to be radially guided by the edge 135. As the edge 135 approaches the recess 139, it increases in radial position from the centre of the stationary disc. All but the thickest coins follow the edge 135 which leads the coins away from the recess 139. As a result, none of these coins enters the recess 139. Since the thickest coin is pressed into the resilient pad and held at a constant radial position in the recess 137, it rotates along a different path than the other thinner coins. This path brings the thickest coin onto the ramp 141 and into the recess 139. Since the recess 139 has a depth sufficient to free the thickest coin denomination from a pressed engagement with the pad, the coins within the recess are radially manipulated by the edge 143. At the end of their journey through the recess 139, the coins are wedged into the resilient pad 19a by a wedge 145 and held in engagement by the ridge 127. Whereas all other coins have been radially positioned by the edge 135, coins of the thickest denomination have been radially positioned by the edge 143 in recess 139. Accordingly, when the coins enter under the area of the stationary disc 21 occupied by the exit recesses 147a-147f, the coins of the thickest denomination have their radially outer edges incorrectly aligned for the exit recesses 147a-147e. Only the recess 147f has a correctly positioned radial opening which releases the coins of the thickest denomination from pressed engagement with the pad and allows the coin to be guided to an exit point at the periphery of the stationary disc. Coins aligned by the recess 139 and edge 143 are never totally free of the ridge 127 as they rotate under the exit recesses 147a-147e. Therefore, they are kept in pressed engagement with the resilient pad 19a and prevented from moving radially outwardly. The other thinner denominations of coins which were radially guided by edge 135 are exited in exit recesses 147a-147e in the same manner as coins exit from recesses 67a-67f in Fig. 2. The exit recesses 147a-147d have associated transitional ramps between the ridge 127 and the recess. They are shaped in a manner to provide maximum coverage by the ridge 127 for coins intended to pass partially under the recess and maintain pressed engagement with the resilient pad 19a. Also, the shape of the ramps reduces the likelihood of non-round coins being radially misaligned as they pass under the recess. In accordance with yet another important aspect of the invention, the diverter guide 113 in the stationary disc 21 can be positioned in a first position in the recess 121 so as to block entrance of coins into the recess or the guide can be positioned in a second position so as to allow coins to pass into the recess 121. As the arrow indicates in Fig. 6,when the diverter guide 113 is in its lowered position, all coins are redirected radially inwardly under the recess extension 119a and into the centre of the stationary disc. Even though some coins may be slightly pressed into the resilient pad 19a when under the recess extension 119a, since the diverter guide 113 is co-planar with the ridge 127 when in its lowered position, the path of least resistance to the coins is that path represented by the arrow. Since only the thickest coin denomination will be pressed into the pad by the recess extension 119a, no significant backlogging should occur behind the diverter guide 113. As with the diverter guide 72 in Fig. 2, the diverter guide 113 in Fig. 6 blocks coin entrance to the recess 121 and thereby protects backlogging and possible coin jamming in the area of bridge guide 111. From the foregoing it can be appreciated that the sorter apparatus according to the invention provides recycle mechanisms which intercept coins in the sorting path and redirects them away from the apparatus output in response to a signal from a sensing device associated with a sorting parameter. In combination with the interception and redirection of the coins, the rotational movement of the coins is retarded or stopped by providing a mechanism to stop the rotation of the rotating disc 19. Preferably the recycle mechanisms and the mechanism to stop the rotation of the rotating disc 19 are responsive to counters associated with the receptacles receiving the sorted denominations of coins so that the sorting function is terminated when a predetermined number of coins have filled any one of the receptacles.

Claims: An apparatus for sorting coins (11) of different denominations, said apparatus comprising: a rotatable disc (19) having a resilient surface (19a); a stationary disc (21) having a surface that is substantially parallel to said resilient surface and positioned sufficiently close to said resilient surface so that at least portions of the stationary surface press any coins in contact therewith into the opposed resilient rotatable surface so that the resiliency of the rotatable surface urges the coins against the stationary surface with sufficient pressure to prevent radial movement of the coins by centrifugal force due to rotation of the rotatable member, while permitting circumferential movement of coins by rotation of the rotatable member; selected areas (49) of the surface of said stationary disc being configured to (a) guide coins in a single file along an arcuate path between the discs, and (b) sort coins of different sizes by causing the coins of each different size to exit from between the discs to a different predetermined position around the periphery of the stationary disc; and means (69) for providing a signal indicative of the presence of a predetermined condition; characterized in that said selected areas (49) include: gating means (71) movable in response to said signal between a first, lower, position in which coins are permitted to escape from between the discs and a second, raised, position in which the escape of coins is prevented and means (72) movable vertically in response to said signal between a first, raised, position in which coins are permitted to enter said arcuate path and a second, lowered, position in which coins are blocked from entering said arcuate path to inhibit backlogging of coins. A coin sorting apparatus as claimed in claim 1, wherein the means (71) comprises a bridge means movable between said first, lower, position and said second, raised, position. A coin sorting apparatus as claimed in any one of claims 1 and 2, wherein said means (69) for providing a signal comprises at least one coin counter (69) located proximate the peripheries of said discs (19,21) for generating a signal in response to the counting of a predetermined number of coins (11). A coin sorting apparatus as claimed in any one of the preceding claims, wherein said rotatable disc (19) is responsive to said signal to stop rotation of said rotatable disc (19). A coin sorting apparatus as claimed in any one of the preceding claims, wherein said stationary disc (21) includes a central open area, and which includes means (71) responsive to said signal for intercepting coins being guided by said recessed areas (49) and guiding the intercepted coins to said central open area. A coin sorting apparatus as claimed in any one of the preceding claims, including a drive motor (37) coupled to said rotating disc (19), and control means (74) responsive to said signal means for de-energizing said drive motor (37). A coin sorting apparatus as claimed in claim 1 which includes a diverter guide (72) mounted for movement between a first and a second position and which spans said accurate path so as to permit coins (11) in said path to pass by said diverter guide (72) undisturbed when said guide (72) is in the said first position, and to intercept and recycle all coins (11) in said path when said diverter guide (72) is in said second position.

Inventors: RATERMAN, DONALD E.
Applicants: CUMMINS-ALLISON CORPORATION
Application year: 1984
Main classification: G07D3
IPC codes: G07D3, G07D9