Technical Field

The present invention relates to a system and method for dispensing articles such as documents, and has particular application to a system and method for dis¬ pensing currency bills.

Background Art

A currency dispenser for automatically dispens¬ ing a required amount of money as desired by a customer- operator of the machine is well known in the art.

However, the reliability of a currency dispens.er is of extreme importance, particularly when the currency dis¬ penser is not supervised in any direct manner. For example, considerable inconvenience may be caused to cus- tomers if, upon the entry of authorized customer requests, the machine fails to operate because the dispenser mal¬ functions or is out of cash.

In U. S. Patent No. 4282424 there is disclosed an automatic currency dispensing system in which a plu- rality of currency dispensing consoles are arranged on a service counter, with an electrical control section for common use being disposed under the service counter. With this system a customer can use any one of the currency dispensing consoles. However, inconvenience will still be caused to a customer if, upon entry of an authorized customer request into a selected console, the console does not operate because the respective dispenser fails to dispense currency bills for any reason.

Disclosure of the Invention

It is an object of the present invention to provide a system and method for dispensing articles, such

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as currency bills, in which the type of customer in¬ convenience referred to above is largely overcome.

According to one aspect of the invention, there is provided a system for dispensing articles including first and second dispensing means for se¬ quentially dispensing articles therefrom, and first and second output stations, characterized by transport means for conveying articles from said first dispensing means into a first path to said first output station and articles from said second dispensing means into a second path to said second output station, first diverter means selectively settable in operation to a first position in which it guides articles dispensed by .said first dispensing means to said first output station or to a second position in which it diverts articles in said first path to said second output station, and second diverter means selectively settable in operation to a first position in which it guides articles dispensed by said second dispensing means to said second output station or to a second position in which it diverts articles in said second path to said first output station.

According to another aspect of the invention, there is provided a method for selectively dispensing articles, said method including the steps of enabling a first dispenser to dispense articles in response to a first request for articles from a first output station and a second dispenser to dispense articles in response to a second request for articles from a second output station, and feeding articles dispensed from the first dispenser along a first path and articles dispensed from the second dispenser along a second path, charac¬ terized by the steps of generating a first signal when the first dispenser is enabled and not dispensing articles or generating a second signal when the second dispenser is enabled and not dispensing articles, and guiding

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articles in the first path to either the first or second output station as a function of the respective absence or presence of said first signal or guiding articles in the second path to either the second or first output station as a function of the respective absence or presence of said second signal.

It will be appreciated that a system and method in accordance with the present invention can be used to minimize the down time of an automatic teller machine (ATM) by sharing the currency dispensers of adjacent

ATMs. Such sharing can be arranged to occur automatically when one currency dispenser is either out of service because of a malfunction or is out of currency.

Brief Description of the Drawings One embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:-

Fig. 1 is a schematic diagram of a side view of a currency dispensing system; Fig. 2 is a cross-sectional view taken along the line 2-2 in Fig. 1;

Fig. 3 illustrates the various possible cur¬ rency paths, depending upon the positions of the flippers 15, and 15 ₂ of the system shown in Fig. 1; Fig. 4 is a schematic block diagram of a con¬ trol circuit which may be used with the currency dispensing system;

Fig. 5 is a schematic block diagram of sensing and control elements in one of the dispensers shown in Fig. 1; and

Figs. 6-14 illustrate a flow diagram giving the steps in the operation of the dispensing system when a customer requests currency from one of two dispensers in the system and that requested dispenser is inoperative or out of currency.

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Best Mode for Carrying out the Invention

Referring now to the drawings, Fig. 1 discloses a schematic diagram of a side view of a fail safe cur¬ rency dispensing system. Although the invention will now be described in relation to a fail safe currency dispensing system for adjacent ATMs, it should be relized that the invention could be utilized more broadly in any other system for dispensing any other type of document. The system shown in Fig. 1 includes first and second ATM units or machines 11-, and 11 ₂ ' respectively, and a common transport mechanism 12 operationally coupled between the ATM units 11, and H *

ATM unit 11, includes a dispenser 13, for dis- pensing currency or bills of a first denomination, a diverter or flipper 15, rotatable to either a clockwise (CW) or a counterclockwise (CCW) position, a flipper position sensor 17, , an output sensor 19, and an output station 21, . The output station 21, normally can in¬ clude: an output receptacle 23, which may be comprised of a stacker wheel 25, and a presenter plate 27, , a numeric keyboard 29, (Fig. 4), a card reader (not shown) and a display (not shown) .

The diverter 15, is affixed to a shaft 31, which is rotatably supported within a protective cabinet 32. One end of a link 33, is fixed to the shaft 31,. The other end of link 33, is pivotally joined to. operating plunger 35, of a solenoid 37, . One end of a spring 39, is operatively connected to the other end of link 33, as shown, while the other end of spring 39, is connected to a fixed point 41, so as to enable the diverter 15, to channel a bill 42, that is dispensed from dispenser 13, , into a first path through the trans¬ port mechanism 12, into the stacker wheel 25, whenever the solenoid 37, is deenergized.

Similarly, the ATM unit 11 ₂ includes elements 13 ₂ , 15 ₂ , 17 ₂ , 19 ₂ , 21 ₂ , 23 ₂ , 25 ₂ , 27 ₂ , 29 ₂ (Fig. 4), 31 ₂ , 33 ₂ (Fig. 2), 35 ₂ (Fig. 2), 37 ₂ (Fig. 2), 39 ₂ (Fig. 2), 41 ₂ (Fig. 2) and a card reader (not shown) and a display (not shown) which are respectively similar in structure and operation to the corresponding elements in ATM 11, , which elements in ATM 11, (when shown) have the same integers as those in ATM 11 ₂ but with a subscript of 1 instead of 2. The transport mechanism 12 is comprised of drive rollers 50-59, follower rollers 60-73, a transport drive motor 75 and pulley and gear train assembly 77. Rollers 50-73 may be made from rubber or a non-marking black Neoprene material. The drive rollers 50-59 are driven by the shaft (not shown) of the transport drive motor 75 by way of the pulley and gear train assem¬ bly 77. The follower rollers 60-73 are positioned adjacent to the drive rollers 50-59 and are driven through compression contact with the drive rollers. Each of the drive rollers 50-59 rotates only in the di¬ rection of its associated arrow. As a result, each of the rollers 50-73 rotates only in one direction.

Depending on the velocity of the bills 42 being dispensed from either of the dispensers 13, and 1 ₂ , the sizes of the pulleys (not shown) in the assem¬ bly 77 are such as to get the same surface velocity for of the drive rollers 50-59 as that of the bills 42 being dispensed from one of the dispensers. Thus, the gear ratios in the pulley and gear train assembly 77 are preselected to get the same surface velocity or speed for each of the drive rollers 50-59 and, hence, for all of the rollers 50-73.

Bills 42 move edgewise from the dispensers

¹³ ]_ and 13 ₂ into and through the associated ones of the rollers 50-73. For ease of passing bills 42 edgewise

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through these rollers, successive nips of the roller pairs are positioned close together. To accomplish this purpose, two different diameters of drive rollers 50-59 are utilized, with the smaller diameter drive rollers 50, 53, 54, 57 and 58 having the higher RPM to get the same surface velocity or speed as the larger diameter drive rollers 51, 52 55, 56 and 59.

To more clearly illustrate the operation of portions of Fig. 1, Fig. 2 will now also be discussed. Fig. 2 illustrates a cross-sectional view taken along the cut line 2-2 in Fig. 1. As shown in Fig. 2, each of the drive and follower rollers 50-73 shown in Fig. 1 represents an exemplary line of coaxially-aligned rollers, designated in Fig. 2 by the corresponding integer but with the subscripts A, B, C and D. Each line of drive and follower rollers 50-73 is spaced across the length of a bill 42 as the bill is passed therethrough.

Each line of rollers 50-73 is appropriately mounted on an associated common shaft by clips 79 to prevent side movement on the associated shaft. In addition, each line of drive and follower rollers 50-73 has each end of its associated shaft coupled through bearings mounted in vertical frame members 81 and 83 of protective cabinet 32 (Fig. 1). Furthermore, each line of drive rollers 50-59 has the end of its associated drive shaft that passes through frame member 83 also coupled to the pulley and gear train assembly 77.

The diverter or flipper 15„ is comprised of an exemplary line of eight thin, flat flipper blades 15 _2ft - 15 ₂ affixed or pinned to a common shaft 31 ₂ which is rotatably supported by bearings in the frame members 81 and 83. Similarly, the diverter or flipper 15, is comprised of an exemplary line of eight thin, flat flipper blades affixed to the shaft 31, . ^s shown in Fig. 2, a pair of flipper blades is mounted on each

side of each roller in a roller line, such as 71 or 65 (or 64 as indicated in Fig. 1).

One end of a link 33„ is fixed to the shaft 31_, while the other end of the link 33 ₂ is pivotally joined to the operating plunger 35 ₂ of solenoid 37 ₂ - One end of spring 39 ₂ is operatively connected to the other end of link 33 ₂ , while the other end of spring 39 ₂ is connected to the fixed point 41 ₂ to enable the diverter 15 ₂ to channel a bill from dispenser 13 ₂ into a second path through the transport mechanism 12, into the stacker wheel 25 ₂ , whenever the solenoid 37 ₂ is deener- gized.

Stacker wheel 25 ₂ is comprised of an exem¬ plary line of three wheels 25 _2A , 25 _2B and 25 _2c . These wheels are affixed to a common shaft (not shown in Fig. 2) which is rotatably supported by bearings (not shown) in the frame members 81 and 83. This shaft of stacker wheel 25 ₂ is also coupled to appropriately selected gears (not shown) in the assembly 77 to cause the stacker wheel 25 ₂ to be rotated at the desired velocity. Similarly, stacker wheel 25, is comprised exemplary line of three wheels affixed to the shaft 31, .

Dispensed bills are collected in respective slots in each of. the wheels 25 ₂ ,-25 _2c of the stacker wheel 25„ (or 25,), such as shown by slot 85 (Fig. 1). In this manner bills 42 are collected in respective slots 85 of the stacker wheel 25.,. As the stacker wheel 25 ₂ rotates in the direction shown by the associated arrow, bills are directed into the presenter plate 27 ₂ to accumulate there in a stack 87 of bills 42. Another conveyor (not shown) could be utilized to convey the accumulated stack 87 to some other destination. It should, of course, be realized that the output recep¬ tacle 23 ₂ can be comprised of, for example, simply a box or container to sequentially receive the bills 42,

rather than a stacker wheel 25 ₂ and presenter plate 27 ₂ . The stacker wheel 25, operates in the same manner as the stacker wheel 5 ₂ «

The various possible currency paths through the transport mechanism 12 are shown in Fig. 3. These paths depend upon the relative positions (CW or CCW) of the flippers 15, and 15 ₂ -

In normal operation, both of the solenoids 37.. (Fig. 1) and 37 ₂ (Fig. 2) are deenergized. When solenoid 37 ₁ is deenergized, flipper 15, is in its normal or CCW position, as shown by the dashed outline 87. Similarly, when solenoid 37 ₂ is deenergized, flip¬ per 15 ₂ is in its normal or CW position, as shown by the solid outline 89. Fig. 1 shows the flippers 15, and 15 ₂ in their normal positions for normal operation.

As shown in Figs. 1 and 3, during normal operation dispenser 13, can sequentially feed bills 42 between rollers 50 and 60, between rollers 51 and 60, along a straight edge 91 of flipper 15,, between rollers 52 and 61, between rollers 52 and 62 and between rollers 53 and 63 to the output receptacle 23, . In a similar manner, during normal operation dispenser 13 ₂ can se¬ quentially feed bills 42 between rollers 55 and 64, along a curved edge 93 of flipper 15„, between rollers 55 and 65, between rollers 56 and 66, between rollers 56 and 67 and between rollers 57 and 68 to output recep¬ tacle 23 ₂ «

When a customer requests currency from ATM 11, and dispenser 13, is either inoperative or out of currency, solenoid 37, (Fig. 1) remains deenergized and solenoid 37 ₂ (Fig. 2) is energized to pull flipper 15 ₂ to its CCW position, as shown by the dashed outline 95. Bills 42 are then sequentially fed from the dispenser

^2 i ^{n A} ™ ¹¹ 2' between rollers 55 and 64, along a straight edge 97 of flipper 15 ₂ between rollers 58 and 71, between rollers 59 and 72, between rollers 59 and

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73, between rollers 51 and 60, along the straight edge 91 of flipper 15, , between rollers 52 and 61, between rollers 52 and 62 and between rollers 53 and 63 to the output receptacle 23, of requested ATM 11, . Thus, dispenser 13 in ATM 11 ₂ can alternately supply bills, when requested, to both the output receptacle 23, of ATM 11 and the output receptacle 23 ₂ of ATM 11 ₂ whenever dispenser 13, is inoperative or out of bills. When dispenser 13, is repaired or restocked with bills 42 and placed back in operation, normal operation is resumed with both of the solenoids 37, (Fig. 1) and 37 ₂ (Fig. 2) 'being deenergized.

Similarly, when a customer requests currency from ATM 11 ₂ and dispenser 13 ₂ is either inoperative or out of bills, solenoid 37 ₂ (Fig. 2) is deenergized and solenoid 37, (Fig. 1) is energized to pull flipper 15, to its CW position, as shown by the solid outline 97. Bills 42 are then sequentially fed from the dispenser 13, in ATM Hi/ between rollers 50 and 60, between rollers 51 and 60, along a curved edge 99 of flipper

15, , between rollers 51 and 69, between rollers 54 and 70, between rollers 56 and 67 and between rollers 57 and 68 to the output receptacle 23 ₂ of requested ATM 11 ₂ « Thus, dispenser 13, in ATM 11, can alternately supply bills, when requested, to both the output receptacle 23 ₂ of ATM 11 ₂ and the output receptacle 23, of ATM 11, whenever dispenser 13 ₂ is inoperative or out of bills. When dispenser 13 ₂ is repaired or restocked with bills 42 and placed back in operation, normal operation is resumed with both of the solenoids 37, (Fig. 1) and 37_ (Fig. 2) being deenergized.

The distance between successive nips of roller pairs in the above-discussed dispensing paths through the transport mechanism is less than the minimum width of the bill 42 being dispensed.

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It should be noted at this time that paper guides (not shown) may be selectively positioned among the assembly of rollers 50-73 to help guide the bills 42 in a dispensing path into and from the nips between associated roller pairs.

Referring now to Fig. 4, a schematic block diagram is illustrated of a control circuit which may be used to control the dispensing operations of components of Fig. 1. Information signals from flipper position sensors 17 _χ and 17 ₂ and output sensors 19, and 19 ₂ are respectively applied through buffer/drivers 101.. , 101 ₂ , 103, , and 103 ₂ to a peripheral interface adapter (PIA) 105 to a microprocessor 107. It should be noted at this time that each of the sensors 17, , 17 ₂ , 19, and 19 ₂ can include a light emitting diode (LED) and a photosensor (not shown) oppositely positioned across a preselected portion of one of the dispensing paths. The passage of a bill 42 or one of the flippers 15, and 15 ₂ between a LED and its associated photosensor interrupts the light path there¬ between, causing the photosensor to develop and apply a signal to the microprocessor 107 to indicate the ob¬ struction across the associated dispensing path. In this manner, each of the output sensors 19.. and 19 ₂ would generate a signal each time that a bill is out- putted from the transport mechanism 12 past that sensor. Similarly, each of the flipper sensors 17.. and 17 ₂ would generate a signal to indicate to the microprocessor 107 the position of the associated one of the flippers 15.. and 15_. For example, as shown in Fig. 1, both of the flippers are in their normal positions, each blocking the light path between the LED and photosensor in its associated one of the flipper sensors 17 _χ and 17 ₂ . When flipper solenoid 37., (37 ₂ ) is energized, flipper 15, (15_) moves to its CW (CCW) position, unblocking the light path between the LED and photosensor in flipper sensor 17 (17-) .

In the extraction of currency, each of the ATM units 11., and 11 ₂ requires a customer to insert his ATM credit card into the ATM unit. This credit card con¬ tains account information written on a magnetic stripe . The customer next enters into the selected one of the numeric keyboards 29 and 29 ₂ his personal ATM identi¬ fication number which corresponds in a predetermined manner to the account information on his ATM credit card. Then the customer enters into the selected key- board his requested currency amount.

Information signals from keyboards 29., and 29_ are applied through respective associated buffer/ driver circuits (not shown) to the microprocessor 107 by way of the PIA 105. Upon receiving a request for currency, the microprocessor 107 starts extracting and executing a software program from a program read only memory (ROM) 109, using a random access memory (RAM) 111 to store temporary data in temporary memory locations. In the execution of the program from the ROM 109, the micro¬ processor basically performs the following operations.

In response to a request for currency from one of the keyboards 29, and 29 ₂ , the microprocessor 107 first checks to see if the dispenser (13., or 13 ₂ ) asso- ciated with the requesting one of the output stations 21 and 21 ₂ (Fig. 1) is not inoperative and not out of bills. If the associated dispenser was inoperative or out of bills the last time it was used, it would send signals to indicate that condition to the microprocessor 107 via an associated PIA. As shown in Fig. 4, the dispensers 13., and 13 ₂ are coupled to the microprocessor 107 by way of PIAs 113- and 113,, respectively. If the associated dispenser is not inoperative and not out of bills, the microprocessor 107 then checks the flipper position sensors 17 and 17 ₂ . The flipper position sensors 17., and 17 ₂ respectively send to the micro¬ processor 107 signals indicative of the positions of the flippers 15

The microprocessor 107 will not enable one of the dispensers 13, and 13 ₂ to dispense bills until the flippers 15, and 15 ₂ are in the proper positions to transport the bills to the requesting one of the output stations 21 and 21 ₂ - If the sensors 17, and 17_ in¬ dicate that one or both of the associated flippers 15.. and 15 ₂ are not in the proper positions to transport currency to the desired one of the output receptacles 23 ₁ and 23,,, the microprocessor 107 will selectively supply signals by way of PIA 105 to power drivers 115. and 115 ₂ to cause flipper solenoids 37., and 37„ to respectively position the flippers 15, and 15 ₂ so that currency .can be subsequently dispensed to the proper receptacle. Such positioning of the flippers 15, and 15- under various operating conditions has been pre¬ viously discussed in relation to Figs. 1-3.

After the flippers 15, and 15 ₂ have been correctly positioned in response to a keyboard request for currency, the microprocessor 107 then applies an energizing signal by way of power driver 117 to energize an AC relay 119. Upon being energized, relay 119 applies an AC voltage to the transport drive motor 75 which, in turn, starts driving the drive rollers 50-59 (Fig. 1) by way of the pulley and gear train assembly 77. Finally, after the drive rollers 50-59 have reached the proper surface speed, the microprocessor 107 sends an enabling signal to the associated one of the dispensers via its associated PIA to enable that dispenser to start sequen¬ tially dispensing bills to the proper one of the output receptacles 23.. and 23 ₂ -

Each bill from the dispensing dispenser passes through the transport mechanism 12 and past the asso¬ ciated one of the output sensors 19 and 19.-, before it goes to the output receptacle of the requesting output station. The associated output sensor sends a signal to the microprocessor 107 each time that a dispensed bill passes that output sensor. In this manner the micro¬ processor 107 keeps track of how many bills have been

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dispensed and knows when the associated dispenser has finished dispensing the amount of bills requested by a customer. When the requested amount of bills has been dispensed, the microprocessor 107 sends a disabling signal to the associated dispenser to stop that dis¬ penser from dispensing any more bills of that denomina¬ tion.

It should be noted at this time that each of the dispensers 13 ₁ and 13 ₂ can store bills of one de- nomination, such as twenty dollar bills in U.S. cur¬ rency, in a first internal bill hopper (not shown) and bills of another denomination, such as five dollar bills in U.S. currency, in a second internal bill hopper (not shown). Such a dispenser is described in U.S. Patent No. 4,179,031.

When the dispensers 13, and 13„ are each implemented to contain two different internal bill hoppers, as described in U.S. Patent No. 4,179,031, the microprocessor 107 can enable the associated dispenser to dispense bills of a second denomination. The dis¬ pensing operation for the second denomination of bill would be the same as that previously discussed for the first denomination of bill and, hence, need not be further discussed. - However, whenever two-denomination bill dispensers are used in the invention, different dispensing paths through the transport mechanism 12 would be utilized. Such dispensing paths from the dispensers 13., and 13 ₂ , while not shown, are similar to the dispensing paths previously discussed. For these additional dispensing paths the system would require additional structure respectively similar to the trans¬ port mechanism 12, flippers 15., and 15 ₂ , solenoids 37, and 37 ₂ , sensors 17, , 17 ₂ , 19, and 1 ₂ , buffer drivers 101., 101 ₂ , 103, and 103 ₂ , power drivers 115, and 115- and PIA 105.

After the associated dispenser has finished dispensing the correct amount of requested bills and is

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disabled by the microprocessor 107, the microprocessor 107 turns off the transport drive motor 75 to terminate the dispensing operation.

Structurally, each of the buffer/drivers 101.., 101 ₂ , 103, and 103 ₂ can be implemented by means of a Fairchild Semiconductor 7407 Hex Buffer/Driver; each of the power drivers 115., , 115. and 117 can be imple¬ mented by means of a Motorola MC 1413 High Current Darlington Driver; each of the PIAs 105, 113, and 113 ₂ can be implemented by means of a Motorola 6821 PIA; microprocessor 107 can be an Intel 8085 AH micro¬ processor; ROM 109 can be an Intel 2716 EPROM; and RAM 111 can be a Motorola 4116 B RAM.

Referring now to Fig. 5, a brief description will now be given of some of the sensing and control elements contained in each of the dispensers 13., and 13 ₂ of Fig. 1. Since the structure and operation of each of the dispensers 13., and 13 ₂ are similar, only one dispenser will be discussed. Essentially, a dispenser is comprised of a pick solenoid 121, a reject flipper and solenoid 122, a dispenser drive motor 122A, a low bill sensor 124, a dispenser output sensor 125, a reject output sensor 126 and a multiple bill detection sensor 127. Dispenser drive motor 122A receives AC power from an AC power source 122B by way of a relay 123, whenever the relay 123 is energized. The elements 121, 122 and 123 through 127 are respectively coupled through buffer/drivers 131 through 137 to the microprocessor 107 by way of its associated one of the PIAs 113., and 113 ₂ . Buffer/drivers 131-137 are similar to buffer/drivers 101, , 101 ₂ , 103, and 103 ₂ shown in Fig. 4.

Signals from the sensors 124-127 indicate to the microprocessor 107 the status of these sensors. In response to a customer request for currency and to the status of signals from the sensors 124-127, the micro¬ processor 107 outputs signals to control the operations

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of the pick solenoid 121, reject flipper and solenoid 122 and dispenser drive motor 122A, as discussed below. After receiving a customer request for bills, the microprocessor 107 sends a signal through buffer/ driver 133 to energize the relay 123 to start the dis¬ penser drive motor 122A. Then microprocessor 107 sends a signal to pick solenoid 121 to actuate the picking device (not shown) that picks a bill (not shown) from a bill hopper (not shown) and feeds it along a dispensing path (not shown) within the dispenser 13- . As the picked bill enters the dispensing path, it goes through the multiple bill detection sensor 127, which determines if it is .one or more bills. If a multiple bill is sensed by the sensor 127, the microprocessor 107 sends a signal to the reject flipper and solenoid 122 to ener¬ gize a reject solenoid (not shown) to reposition a reject flipper (not shown) in order to reroute the double bill into a reject bin or hopper (not shown).

As soon as the multiple bill leaves the dis- pensing path and goes into the reject hopper, the reject output sensor 126 sends a signal to the microprocessor 107 to indicate that the multiple bill has been rejec¬ ted. The microprocessor 107 then resets the reject flipper in reject flipper and solenoid 122 to its normal position and re-energizes the pick solenoid 121 to cause the picking device to pick and dispense another bill to take the place of the multiple bill.. If that bill is a single bill, it will be passed through the dispensing path and through the dispenser output sensor 125 into an output tray (not shown). The dispenser output sensor 125 then sends a signal to the microprocessor 107 to indicate that the bill has been successfully outputted from the dispenser. Microprocessor 107 then counts that bill as being dispensed from the dispenser. The above dispenser operation would be re¬ peated until the dispenser has dispensed the requested amount of currency.

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The low bill sensor 124 sends a signal to the microprocessor 107 when the bill hopper is low on bills. As a consequence of such a signal, the microprocessor 107 would take the dispenser out of service, preventing any more bills from being dispensed from that dispenser until the dispenser is restocked with bills of that denomination.

Each of the dispensers 13 _τ and 13 ₂ has a similar operation for dispensing bills of a second denomination, as described in previously mentioned U.S. Patent No. 4,179,031.

For a more detailed description of the step- by-step sequence involved in the operation of the fail safe document dispensing system disclosed in Figs. 1-5, reference is now made to Figs. 6-14. These figures show the essential operational steps that are involved after a customer at output station 21- has entered his credit card and ID number and made a currency request. As indicated previously, these operational steps are con- trolled by the microprocessor 107 during the execution of the software program that is extracted from the ROM 109. It should, of course, be realized that similar operational steps would be involved for a customer at output station 21, making a currency request. Since a currency request was initially made at output station 21 ₂ , the fail safe dispensing system first tries to dispense a bill from dispenser 13_ and send it to output station 21-. As a result, the micro¬ processor 107 first checks to see if dispenser 13„ is operational. If it is known to be bad from a previous dispensing operation, the program would move to node A and try to dispense a bill from dispenser 13 to output station 21-.

If dispenser 13 ₂ is still operational, low bill sensor 124 (Fig. 5) would be checked to find out if dispenser 13_ has enough bills. If there are not enough bills in dispenser 13„, a low currency failure would be

flagged or logged for dispenser 13- and the program would move to node A to try to dispense a bill from dispenser 13., to output station 21 _2>

If dispenser 13 ₂ is operational and contains enough bills, the system starts an operation to dispense a bill from dispenser 13 ₂ to output station 21 ₂ - The first thing the system does is to set the flippers 15.. and 15 ₂ in their proper positions to enable a bill from dispenser 13 ₂ to pass through the transport mechanism 12 to output station 21 _2> First, solenoid 37 ₂ is de-ener¬ gized. This should cause flipper 15 ₂ to be in its CW position. Flipper position sensor 17_ is tested to see if flipper 15 ₂ is in its CW position. If flipper 15 ₂ is not in its CW position, a transport mechanism 12 failure is logged and the program moves to exit Z to terminate the system operation.

If flipper 15 ₂ is in its CW position, solenoid 37, is de-energized to cause flipper 15, to be in its CCW position. Flipper position sensor 17, is then tested to see if flipper 15 is in its CCW position. If flipper 15 ₁ is not in its CCW position, a transport mechanism 12 failure is logged and the program moves to exit Z to terminate the system operation.

If both of flippers 15., and 15 ₂ are in their proper de-energized positions, the dispenser 13„ drive motor 122A (Fig. 5) and the transport drive motor 75 (Fig. 1) are both turned on and allowed ^' to reach stable speeds.

The next routine is to pick a single bill in the dispenser 13 _2> The pick solenoid 121 (Fig. 5) is energized to cause a bill picker (not shown) to pick a bill from a bill hopper inside of the dispenser 13 ₂ . After a bill is picked, it is checked by the multiple bill detection sensor 127 (Fig. 5) to see if two or more bills were simultaneously picked. If sensor 127 indi¬ cates a multiple bill, the reject flipper and solenoid

unit 122 (Fig. 5) is set to automatically detour the multiple bill to a reject hopper (not shown) . Then the flipper and solenoid unit 122 is reset. In this manner, each multiple bill is rejected, while each single bill is passed.

After a single bill has been picked, the next routine is to move that picked bill from the bill picker to the dispenser 13, output.

Whenever a single bill is picked and not rejected, the operation moves to node E at which time the multiple bill detection sensor 127 signals the microprocessor 107 to start a dispenser jam timer in the software program from the ROM 109. The time length of the dispenser jam timer is fixed since it is known how long it takes a bill to be moved past the output sensor 125 (Fig. 5) of dispenser 13 ₂ after the bill is picked and not rejected.

After the dispenser jam timer is started, the microprocessor 107 waits to see if a bill moves past the output sensor 125 of the dispenser 13„ before the dis¬ penser jam timer expires. If the dispenser jam timer expires before a bill is outputted, this means that the bill is jammed inside the dispenser 13,. In this case, a dispenser 13- failure is logged, the transport drive motor 75 and the dispenser 13, drive motor are both turned off, and the program moves to node A to try to dispense a bill from dispenser 13., to output station 21 ₂ .

If the bill is picked properly and is moved past the output sensor 125 of the dispenser 13- before the dispenser jam timer expires, the next routine is to move that bill from the output of the dispenser 13, through the transport mechanism 12 to the stacker wheel 25 ₂ at output station 21 ₂ . Each bill that exits from the dispenser 13 ₂ causes the output sensor 125 of dispenser 13, to signal

the microprocessor 107 to start a fail safe jam timer in the software program from the ROM 109. The duration of the fail safe jam timer is fixed since the distance from the dispenser 13 ₂ to the stacker wheel 25 ₂ and the surface speed of the transport mechanism 12 are both known.

After the fail safe jam timer is started the microprocessor 107 waits to see if a bill moves past output sensor 19 ₂ (Fig. 1) before the fail safe jam timer expires. If the bill doesn't reach the output sensor 19 ₂ before the fail safe jam timer expires, a transport mechanism 12 failure is logged. Because such a failure is very critical, the program then moves to exit Y to terminate the entire system operation. If a bill is detected by the output sensor

19, before the fail safe jam timer expires, and is thus delivered to the stacker wheel 25, of output station 21,, the operation is finished for the dispensing of that bill. In such a case, the microprocessor 107 decrements the customer-requested number of bills by one and decides whether or not any more bills have to be dispensed by the dispenser 13,. If more bills have to be dispensed, the program goes back into the loop at node S and repeats the steps shown in Figs. 7, 8 and 9 for each additional bill that has to be dispensed. When the total number of requested bills has been dispensed from dis¬ penser 13„ to output station 21 ₂ , the dispensing oper¬ ation is complete and the program moves to exit Y to terminate the entire system operation. At exit Y all of the motors are turned off, the flipper solenoids are de¬ energized and everything is powered down to prevent any waste of power.

In relation to Figs. 6 and 8 it was mentioned that if anything went wrong in trying to dispense a bill from dispenser 13 ₂ , the routine would branch to node A and attempt to dispense a bill from dispenser 13 to output station 21-. Routine A will now be examined.

The operational steps involved from routine A on, as shown in Figs. 10-13, are similar to the pre¬ viously discussed operational steps shown in Figs. 6-9. At the start of routine A, all of the motors have been turned off and the flipper solenoids 37 and 37, are in their de-energized states.

The microprocessor 107 first checks to see if dispenser 13., is operational. If it is known to be bad from a previous dispensing operation, the program would log a failure for both of dispensers 13. and 13, and move to exit Z to terminate the system operation because neither dispenser is operative.

If dispenser 13.. is still operational, micro¬ processor 107 checks the low bill sensor 124 (Fig. 5) to find out if dispenser 13 ₁ has enough bills. If there are not enough bills in dispenser 13., , a low currency fail¬ ure would be logged for dispenser 13., and the program would move to exit Z to terminate the system operation because neither dispenser is operative. Since the initial currency request was made at output station 21- and dispenser 13 ₂ is inoperative, the fail safe system will try to move a bill from dispenser 13 _τ to output station 21 _? . Because the dispenser 13, of ATM 11., will be used to supply currency to the output station 21 ₂ of ATM 11,, the flippers 15 ₁ and 15 ₂ may have to be in different positions. Consequently, the microprocessor 107 will de-energize solenoid 37 to move flipper 15„ to its CW position and then test flipper position sensor 17 ₂ to see if flipper 15 ₂ is CW. Next, the microprocessor 107 will energize solenoid 37.. to move flipper 15, to its CW position and then test flip¬ per position sensor 17, to see if flipper 15, is CW. If either of the flippers 15, and 15 ₂ is not in its CW position, a transport mechanism 12 failure is logged and the program moves to exit Z to terminate the fail safe system operation.

If both of flippers 15., and 15 ₂ are in their CW positions, the drive motor 122A (Fig. 5) of the di

penser 13, and the transport drive motor 75 (Fig. 1) are turned on and allowed to reach stable speeds. Then a bill is picked by a bill picker (not shown) from a hopper inside of the dispenser 13 by energizing the pick solenoid 121 (Fig. 5) in that dispenser 13 . After the bill is picked it is checked by the multiple bill detection sensor 127 (Fig. 5) in dispenser 13. to see if two or more bills were simultaneously picked. If a multiple bill is detected, the reject flipper and sol- enoid unit 122 (Fig. 5) of dispenser 13. is set to automatically detour the multiple bill to a reject hopper (not shown) in dispenser 13_, . Then the reject flipper and solenoid unit 122 is reset to its normal position. Another bill is picked and tested for a mul¬ tiple bill. If another multiple bill is detected, it is rejected in the same manner discussed above. If a single bill is picked and no multiple bill is detected, the operation moves to node G where a dispenser jam timer is started in the software program from the ROM 109 as the bill is moved from the multiple bill detec¬ tion sensor 127 toward the output sensor 125 of the dispenser 13., . If the dispenser jam timer expires before a bill passes the output sensor 125 of dispenser 13.., a dispenser 13, failure is logged and the program moves to exit Y to terminate, the entire system operation.

It should be noted that the expiration of the jam timers for both of the dispensers 13 and 13. pro- duces different system operations. If the jam timer initially fails for dispenser 13 , dispenser 13, can be tried. However, if there is also a jam in dispenser 13., , there is no other dispenser to try and the system operation must be terminated. Although, this was the operation that was described above, it should be real- ized that fail safe systems utilizing three or more ATMs could be implemented within the purview of this inven¬ tion.

If the bill is picked properly and is moved past the output sensor 125 of dispenser 13., before the dispenser jam timer expires, the next routine is to move that bill from the output of the dispenser 13., through the transport mechanism 12 to the stacker wheel 25 at output station 21,.

Each bill that exits from the dispenser 13 causes the output sensor 125 of dispenser 13., to signal the microprocessor 107 to start the fail safe jam timer in the software program from the ROM 109. The duration of the fail safe jam timer is fixed by the surface speed of the transport mechanism 12 and the longer of the two distances from the dispensers 13. and 13, to the stacker wheel 25 ₂ of the output station 21 ₂ - if the fail safe jam timer expires before the bill from dispenser 13 reaches stacker wheel 25 ₂ , this means that the bill has become jammed in the transport mechanism 12. In such a case, a transport mechanism 12 failure is logged and the program then moves to exit Y to terminate the entire system operation.

If the bill is detected by the output sensor 19 before the fail safe jam timer expires, and is thus delivered to the stacker wheel 25„ of output station 21,., the operation is finished for the dispensing of that bill. The microprocessor 107 then decrements the customer-requested number of bills by one and decides whether or not any more bills have to be dispensed by dispenser 13., . If more bills have to be dispensed, the program goes back into the loop at node J and repeats the steps shown in Figs. 11, 12 and 13 for each addi¬ tional bill that has to be dispensed. When the total number of requested bills has been dispensed from dis¬ penser 13., to output station 21 ₂ , the dispensing oper¬ ation is complete and the program moves to exit Y to terminate the entire system operation.

Fig. 14 illustrates the operational steps involved in exits Y and Z. At exit Y, the transport

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drive motor 75 and the drive motors of dispensers 13 and 13- are all turned off. Since none of these motors were on at exit Z, exit Z enters the operation at this time. Then the flipper solenoids 37., and 37, are de- energized. In this manner the fail safe system is set to an idle state to conserve power. As a convenience, a status bit is then set to indicate whether or not the dispensing operation was successfully completed. The system operation is then ended. The invention thus provides a system and method for automatically and mutually sharing the cur¬ rency dispensers in adjacent ATMs when one dispenser is either out of service because of a malfunction or out of currency.