DE2247753A1 - CONTROL CIRCUIT FOR A VENDING MACHINE - Google Patents

Description

Control circuit for a vending machine

The invention "relates to a control circuit for a vending machine with a coin input, a Goods selector switch and an electrically "operated goods dispenser. .."

Vending machines usually use electromechanical ones Devices, such as relays or the like, to the goods issue processes to control. A typical work sequence begins with the insertion of coins into a coin feeder.

309835/0353

This coin input causes a switch to close as a signal that there are enough coins to buy a product were thrown in. This credit signal is stored in an electromechanical relay. During storage of the credit signal, this relay can close a circuit, the supply voltage to a number of There are selection switches, which in turn are then actuated. to activate additional relays to switch on the goods issue. There are precautions in the circuit hit, so that only one selection process can be made for each credit signal from the coin input is supplied, and that after each selection of goods, the stored credit signal is deleted.

These electromechanical devices that provide the required Logic for operating a vending machine represent, however, have many disadvantages. So are the mechanical ones Parts subject to wear, so that repeated readjustment is necessary. The right The operation of this device depends on the fact that all parts work in a short temporal relationship to one another. The relatively slow moving mechanical However, parts often do not have the correct temporal relationship to one another and can therefore use the generated credit signal lose, causing a customer to lose their money lates. Leaving the chronological sequence can, however, also prevent the credit signal from being deleted after the goods have been selected, which results in a considerable loss of income for the merchant operating the machine results.

Another problem that arises from the slowness of the mechanical parts is that which arises under certain conditions

309835/0353

resulting possibility of "catching" a credit signal, whereby a larger amount of goods can be issued than is justified by the credit generated in each case is manipulated by the electrical supply voltage for the vending machine or else the goods selector switch be operated very quickly or by other physical actions that violate the regulations be made on the machine that a shock and / or vibration of the various mechanical Effect parts. Many different attempts have been made In order to circumvent these disadvantages, however, these attempts using mechanical parts have made the machine users imposed corresponding loads, which then either store a large number of different spare parts have to or have to accept significant yield losses as a result of machines operating for longer periods of time are not operational »

Recently, various attempts have been made to by using plague body circuits, the disadvantages of to eliminate electromechanical devices described above. Such a solution is given in US-PS 3 4-51 518, which, however, has a number of * limitations · After the completion of a sales transaction, a capacitor to be recharged before another sale can begin. This limits the machine's operating speed. Since the completely charged capacitor a high voltage to the actuators for the issue of goods, namely controlled silicon rectifiers, there need line faults or electrical Noise signals just have to be big enough to make up the difference

309835/0353

between the capacitor charge and the breakdown voltage to compensate for the controlled silicon rectifier and thus to cause false sales functions. aside from that maintains this capacitor charge even after a certain time after the machine has been switched off Supply voltage poses a safety risk to maintenance personnel . Finally, this known arrangement consumes a considerable amount of time during stand-by operation substantial dining performance. > "

The object of the invention is a new one made of solid structural elements constructed control circuit for a vending machine or the like to create the vending machine of its different with a simple circuit structure which and certain functions assigned switching states as a function of certain time intervals or determined ter interventions from the outside into the correct switching state.

In a control circuit of the type mentioned, this task solved according to the invention, .that the control circuit formed a first of solid-state components Has switch for the connections of the control circuit, which when a supply voltage is applied to the control circuit goes into the switched-on state, after which the coin input goes into a coin-accepting state, that a memory connected to the coin input is provided and that a second one made of solid-state components formed switch for the supply voltage with the The memory is connected and can be switched on * when the memory is actuated, whereby the first switch is switched off,

3 0 9835/0353

when the second switch is switched on, creating a voltage for the goods selector switch and the goods issue can be generated.

With the aid of the control circuit according to the invention, a suitable coin is inserted into the coin input Working potential given to several goods selector switches. The actuation of one of these goods selector switches causes the issue of the goods and at the same time the blocking. of components of the control circuit in order to prevent further output of additional viars. Each of the output of a commodity, a timer provided in the control circuit causes it to be switched to the standby position for receiving further coins.

With the control circuit according to the invention, a predetermined time interval is also monitored during which a product must be selected. If no goods are selected during this time interval, the control circuit switches the Vending machines return to a switching state in which this accept coins again for a new sale can. The control circuit according to the invention has no moving parts, which means that the previously occurring Problems such as wear and tear, foreign particles, 3? Ehl adjustment, · Soiling, shock, vibrations or the like can be removed. The control circuit according to the invention can be used in conjunction with a variety of different vending machines. The possible quick return of the vending machine to its readiness position for a new one. Coin input, regardless of whether goods have been issued or not,

309835/0353

BAD QRIGlNAU

prevents turned on only for a short time operation devices can burn out when, for example does not operate the goods selection switch according to the _coin-f In addition, the control circuit of the invention ensures that the coins input only accepts coins, when the vending machine receives a sufficient supply voltage to its To fulfill V / aren output functions.

The invention is shown on hand .in the drawing Embodiments explained in more detail. Show in detail:

Fig. 1 is a block diagram of a first embodiment of the control circuit according to the invention,

Fig. 2 is a circuit diagram of the block diagram shown in Fig. 1,

3 shows a block diagram of a second exemplary embodiment the control circuit according to the invention,

Fig. 4 is a circuit diagram of the block diagram shown in Fig. 3,

5 shows a block diagram of a further exemplary embodiment the control circuit according to the invention and

FIG. 6 is a circuit diagram of the block diagram shown in FIG.

The control circuit according to the invention is designed in such a way that it { many of the control j

j 309835/0353

BAO ORIQINAL

circuits for vending machines occurring-.difficulties can eliminate. Although the control circuit according to the invention described here in connection with sales transactions it can of course also be used in connection with other machine processes «

In principle, the invention has a power switch or switch for the input terminals, which when a electrical supply voltage is switched on to the machine. If this switch is switched on, the machine can Accept coins and after a correct insertion of coins see the memory of the control circuit in an activated state, whereby this turned on the main switch for the sales process. Is the main switch switched on, the switch for the connections is activated switched off again, so that no more coins can be inserted until the sales process has ended. The main switch gives the working voltages to the goods selector switch and the output magnets or other electrical ones Output devices. Became eifi. certain goods selector switch is actuated, the output process then follows «In the circuit a delay interval is provided, so that the The switch for the connections is switched on again, the memory is deleted and the main switch is switched off when a certain time interval after pressing the goods selection switch has passed »To a burnout of the components to prevent being used solely for short-term use are designed, the switch for the connections is also switched on and the main switch is switched off, if no sales process in, a predetermined time interval has ended, e.g. 15 minutes after the machine was stopped for

30 98 35/0 353

a sales transaction "has been activated.

1 shows a block diagram of an embodiment of the invention. A first switch 10 for the connections is connected to a connection of the coin input 14 via a line 12. The coin input 14 is connected via a line 16 to a memory 18 which in turn is connected via a line 20 to a second switch 22 designed as a main switch and via a line 19 to the first switch 10. The main switch is in turn connected via a line 24 to the first switch and via lines 26 and 28 to the goods selection switches 30 and switches 32 for the supply of electromagnets. A line 34 connects the goods selection switches 30 to the switches 32. The output magnets 36 are connected to the switches 32 via a line 38. The block diagram of FIG. 1 is completed by a timing circuit 40 which is connected to switches 32 and; is connected to the first switch via a line 44.

If electrical supply voltage is given to the control circuit, so the first switch 10 is switched on. This also switches on the coin input 14, which causes it Can accept coins. If in the connection part 14 of the coin input a credit signal by inserting a correct one Number of coins generated, the memory 18 is activated. Activation of the memory switches the main switch 22 one, which in turn turns off the first switch. If the first switch is switched off, no more coins can be used

309835/0353

can be accepted by the coin entry gate "until the vending process" is completed. The presence of supply voltage the main switch "causes the supply of working voltage both to the goods selector switch and the switches for the electromagnets. The actuation of one of the goods selector switches "then causes the actuation of one of the output solenoids in order to sell a" certain selected To effect goods. Simultaneously with the supply of supply voltage to one of the output electromagnets, The timer 4-0 is also actuated via the switch 32, whereby the first switch 10 after a certain time Delay is switched on again - the delay used, which can be of the order of 500 ms, enough-enough to stop the sales process from the electromechanical To terminate output devices. If the first switch 10 is switched on again, the memory 18 deleted, which in turn the main switch 22 is turned off, so that now the control circuit for the Start of a new sales process is ready.

In the circuit diagram shown in Fig. 2 are more Details of the block diagram of FIG. 1 can be seen. The goods selector switches 30 are in detail with 30a, 30b, 30c, 3Od, 3Oe and 3Of. The switches 32 for the electromagnets each have a controlled silicon rectifier 4-6, with the control electrode 48 of the rectifier is connected to a parallel circuit of a resistor and a capacitor 52. The arrangements 54- each controlled rectifier is via a capacitor 56 connected to the cathode 58. All cathodes are common connected to a line 60.

309835/0353

The output electromagnets 36 each have coils 36a to 36f. Sold out switch 62 designated in detail Switches 62a through 62f are each one-sided connected to the coil of one of the output electromagnets, which in turn is connected to the anode of one of the controlled silicon rectifiers 46 is connected, which form the feed switch for the electromagnets. The top connectors of each of the Sold out switches 62 are commonly connected to a line 64. '*

The control circuit is connected to a conventional AC voltage source connected via lines 70 and 72. Between A filter network is connected to lines 70 and 72, the one connected to a capacitor 76 resistor 74 and a second connected to a resistor 80 Capacitor 78 on v / eist. A pair of silicon controlled rectifiers 82 and 84- are connected in parallel with the filter network. The control electrodes of silicon rectifiers 82 and 84 are each provided with resistors 86 and 88, one Capacitor 90 and a diode 92 connected. The connections of the resistors 86, 88, the capacitor 90 and the diode 92 on the right are in common with a resistor 94- and a diode 96 connected. Resistance 94-, is connected to a diode 98, which in turn is connected to a Pair of resistors 100 and 102 are connected with the lower terminal of resistor 102 connected to a capacitor 104 and a neon lamp 106 is connected. The lower connector of the capacitor 104 is connected to the line 72 via a diode 108. A resistor 110 and a capacitor 112 are connected between lines 70 and 72.

Part of the coin input of the vending machine is with and has a coil 116 connected to the lead

■ ι

309835/0353

70 and the anode of the diode 118 is connected. The cathode the diode 118 is also connected to the line 70. The anode of diode 118 is connected to the anode of a diode 120 connected, which in turn is connected with its cathode to the anodes of diodes 122 and 124 «A credit switch 126 is connected to the lower terminal of the capacitor 112 and to the anode of a diode 96. Will be common the credit switch will close when a suitable amount of coins has been thrown into the coin deposit box. the Coil 116 is part of a coin return solenoid.

The control electrode of the controlled silicon rectifier 124 is connected to the ion lamp 106 and the parallel connection a capacitor 128 and a resistor 130 are connected. The lower connection of the capacitor 128 and the resistor 130 are one with the line 72 and the anode Diode 132 connected. The parallel connection of a capacitor 134 and a resistor I36 are with a terminal connected to the neon lamp I38, which in turn is connected to the cathode the diode 122 is connected. The lower terminal of the capacitor 134 connects to the upper terminal of the resistor and the lower terminal of resistor I36 is connected to the Parallel connection of the capacitor 140 and the resistor 142 and connected to the cathode of the diode 144. The anode of diode 144 is connected to the cathode of diode 132 and a Resistor 146 connected. The lower connection of the resistor 146 is connected to a second resistor 148, the connection point between the resistors 146 and 148 being connected to the goods selector switches 30.

A diode I50 has its cathode connected to the top terminal of the capacitor 128 and a resistor I30 and with their

309835/035 3 BATH ORIGINAL

Anode with a capacitor 152 and a resistor tied together. The resistor 154 is in turn with a Ncon lamp 156 connected, with the opposite terminal the neon lamp 156 via a resistor 158 with the cathode of diode 150 is connected. The circuit is completed by a resistor 160 connected to the line 60 and the anode of a diode 162 is connected. The cathode of diode 162 is connected to line 70 tied together. '

For the operation of the control circuit according to the invention, it is assumed that the vending machine is filled with goods and the supply voltage is first given to lines 70 and 72. * st line 70 sufficiently positive with respect to the line 72, a current flows through the diode 103, the cathode-control electrode path of the controlled rectifier .124, the capacitor 134, the neon lamp 158, the diodes 122 and ¹¹²⁰ as well as the Coin 116 of the coin return solenoid which is part of the coin input 114. The sizes of the capacitor 134, the capacitor 128, the resistor I30 and the neon lamp 138 can be selected in such a way that the controlled rectifier 124 becomes conductive only at a predetermined voltage level of the voltage supplied. In this way, the coin return solenoid, which must be switched on before the vending machine will accept coins, will never accept coins if the supplied supply voltage is too low to actuate the dispensing solenoid sufficiently.

If the controlled rectifier 124 is switched to its conductive state, it remains in the conductive state

309835/0353

for the remainder of the half cycle during which line 70 is positive to line 72. Of the Rectifier 124 blocks, however, if the current ran through the Coil 116 approaches the value 0. During the period that line 70 is negative to the. management 72 causes the energy stored in coil 116 a current flow through diode 118 to the coin reproducing solenoid keep energized until controlled rectifier 124 again during the next half cycle the applied voltage conducts.

The current flowing through the controlled rectifier 124 also flows through the diode 98, the V / i that stood 94, the Capacitor 90 and diode 92 connected in parallel, as well as across capacitor 76 and resistor 7 ^ · The control electrodes of the controlled rectifiers -82 and 84 remain at a negative potential with respect to theirs Cathodes, which increases the reverse voltage of the rectifier and prevents it from becoming positive Build up voltage on capacitor 90 and turn one of the controlled rectifiers into an undesirable sliding State can lead. As previously indicated, the switching of resistors 80 and 74 and capacitors 78 is effective and 76 as a filter to avoid voltage fluctuations in the mains voltage to eliminate.

The silicon controlled rectifier 124, which acts as the first switch 10, remains in its conductive state until enough coins to be inserted into the coin dispenser to close the credit switch 126. Closing the Switch is only used during a few periods of storage

309835/0353

Maintain covering. During the period of time during which the switch is closed and when the line 70 is negative with respect to the line 72 , a current flows through the diode 162, the resistor 148, the resistor 146, the cathode-control electrode path of the controlled rectifier 84, via the parallel connection of the resistor 88 and the capacitor 90, via the diode 96, via the credit switch 126 and the resistor 110. This current controls the controlled rectifier 84 in its conductive state. When the rectifier is conducting, a current then flows through the cathode-control electrode path of the controlled rectifier 124, the parallel connection of capacitor 128 and resistor 130, capacitor 13, resistor 1J6 and diode 144. However, this current does not control controlled rectifier 124 into its conductive state, since its anode is not positive at this time. The capacitor 140 is almost charged to the supply voltage, and this charge acting via the resistor 136 biases the neon lamp 138 so that it cannot ignite during the next positive half-cycle. When the controlled rectifier 124 is blocked, the coil 116 receives no current, so that the coin return electromagnet of the coin input itself will reject any further coins that are inserted.

The control current for the controlled rectifier 84 is supplied by the capacitor 90, which acts as a "memory" in the circuit works. The controlled rectifiers 84 and 82 are alternately conductive for successive half-cycles of the supplied AC voltage, the capacitor 90 supplies the control current for both rectifiers. The condensate

309835/0353

Sator 90 stores energy when the control electrode of the conductive controlled rectifier, acts as a source and uses this energy to control the other controlled rectifier in its conductive state, .as soon the supply voltage changes polarity. To this The controlled rectifiers 82 and 84 act as main switches 22. Are the controlled rectifiers 82 and 84 conductive, the controlled rectifier 124 is or the first switch 10 .not conductive «The memory switches the main switch 22 into its conductive state, which in turn blocks the first switch.

When the controlled rectifiers 82 and 84 ″ conduct, the current flowing through the resistors 148 and 146 generates whose connection point is a tension. This voltage is given directly to the switch 30 goods selection. Is anybody the goods selector switch 30 pressed down at the moment, so this gives positive voltage to the control electrode 48 of any of the controlled rectifiers 46 and therefore controls that particular rectifier into its conductive state. The current then flows through an output solenoid 36 and assuming that the sell-out t switches are closed, to the common line 64. The dispensing mechanism is controlled by one of the electromagnets 36 actuated and the particular controlled rectifier 46, if this is controlled to be conductive, the diode 132 remains conductive according to the mode of operation, which is the Allowing a reaction current to flow through the controlled rectifier during the time when the supplied Current goes through 0. The same current also flows through resistor 160, so that the drop across this resistor

309835/0353

Voltage to all feed switches 32 for the electromagnets raises sufficiently above ground potential to allow the application of a positive potential to a second controlled Rectifier by operating a goods selector switch to prevent. In this way the circuit is very effective in preventing more than one of the output solenoids from being released can respond when the credit switch is closed.

The voltage drop across resistor 160 charges the capacitor 152 through the resistor 15 '+ »to the controlled Rectifier 124 is controlled. The time to recharge of the capacitor 152 until the point in time at which the controlled rectifier 124 is activated, is the one available for actuating the dispensing mechanism. Time. You can choose the values for resistor 154 and the capacitor 152 are adjusted, these EC combination forms the time circuit 40.

The controlled rectifier 124 is activated the discharge of the storage capacitor 90 via the diode 98 and the resistor 94. Regardless of which of the controlled rectifiers 82 or 84 at this point in time ' is conductive, this rectifier is blocked at the end of the respective half cycle and the other is controlled The rectifier is not turned on for the next half-cycle, as this is due to the discharging of the capacitor 90 a positive control voltage is missing. Are both controlled Rectifiers 82 and 84 are blocked, so no current can be passed through the output electromagnet, nor through the feed switch for

309835/0353

the electromagnets flow and no more goods are given out in this way. The actuation of the first Switch Ί0 "or the controlled rectifier 124 has cleared the memory, i.e. discharged the capacitor 90, and the main switch, i.e. the controlled rectifiers 82 and 84, locked.

At the same time, capacitor 140 overdischarges the resistor 142 and allows the neon lamp 138 to ignite. The resulting current pulse again controls the controlled rectifier 124. Is the controlled rectifier 124 is conductive, the supply voltage is again applied to the coin return magnet 116 and the machine is thus off ready for operation again and able to receive coins.

As previously described, one of the problems so far is known vending machines that it is possible in some cases is the supply voltage given to the vending machine manipulate during a sales process in such a way that that the output solenoid triggered and re-energized wi, rd before the control relays prevent this can, so that twice the amount of goods is issued. The one in Pig. 2 prevents this by the controlled rectifiers 82 and 84 do not return immediately after a brief interruption in the supply voltage can be controlled. The pin network consisting of resistors 74 and 80 and capacitors 76 and 78 assist the controlled rectifiers 82 and 84 in their blocking and prevent a rapidly rising and re-applied supply voltage can control it again conductive. The supply switches for the electrical

309835/0353

magnets keep the output electromagnets energized until all of the stored energy has drained away is. Before the electromagnet drops out and the feed switch for the electromagnet blocks, the storage capacitor has 90 sufficient time for its discharge, \ tfodurch the control circuit has returned to its idle state in which the controlled rectifier 124 conducts and so that the machine is ready to receive new coins.

/ ■ ■ ■.

To avoid damaging the components of the machine itself prevent, such as meters that are only intended for short-term operation, and to prevent unnecessary maintenance calls, both of which can occur if a long period of time during which the vending machine would occur is in a ready-to-sell condition, after the credit switch has been closed, the controlled rectifier is located, as described above 124 or the first switch 10 in its locked state. The capacitor 104 now begins over the resistors 102 and 100, the diode 120 and the coil 116 to charge. If the ignition voltage of the neon lamp 106 is reached, so this ignites and controls the controlled rectifier 124 in its conductive state, whereby the machine in. is reset to its normal ready state, in which it can again accept coins. Usually the Time to charge the capacitor 104 on the order of magnitude set at about 15 minutes.

Another feature of the circuit described above relates to protection against damage if one of the output electromagnets is shorted. If one of the electromagnets J6 is short-circuited, so

309835/0353

if the voltage across resistor 160 exceeds the
Ignition voltage of the Ueon lamp 156, whereby the controlled
Rectifier 124 switched to its conductive state
and the duration of the short-circuit current through the output electromagnet is limited to a half cycle of the supplied sine wave. Due to this limitation of the current, there is only a small possibility of damage
any component.

In the 3? 3 and. 4 shows a second embodiment of the control circuit according to the invention. One for that
Connections provided first switch 170 is via a
Line 172 is connected to the part of the coin input 174 which emits the credit signal. The connection 174 is connected to the memory 178 via a line 176. The memory is connected to the first switch via a line 180 and has the same function as described above, so that after the memory has been actuated as a result of the correct insertion of coins into the coin input, it switches the first switch to its blocked state. The memory is via a line 182 with a main switch or! Second
Switch 184 connected.

The main switch 184 is via a line 186 with a
Series of goods selector switches 188 connected, which in turn are connected via a line 190 to a secondary circuit breaker 192, which performs the same function as
the circuit breakers for the electromagnets of FIGS. 1 and 2. The main switch is also connected to the secondary circuit breakers 192 via a line 191. The secondary circuit breaker 192 is connected via a line 194

309835/0353

an output device 196 and a line 198 with a logic circuit 200 connected. The logic circuit 200 is in turn connected to the memory 1-8 via a line 202 and to the first switch via a line 204- and via a line 201 to the V / aren selector switches 188 tied together.

During operation, a first applied electrical switches Supply voltage the first switch in its conductive State. Correct input of coins into the coin input causes the operation of the memory 178. Is the memory actuated, the main switch is switched to its conductive state and the first switch is blocked. The operation the main switch causes a suitable voltage to be sent to the input of the goods-heating switch 188, so that when one of these switches is actuated, the secondary circuit breaker 192 is actuated. The operation the secondary circuit breaker 192 causes actuation a dispensing mechanism and at the same time the combination of the voltage given to the goods selector switch, so that no further actuation of a goods selector switch possible which would cause actuation of the dispensing mechanism. The logic circuit also starts a storage time cycle, in the form of the discharge of a capacitor, at the end of which the first switch is switched on again and the main switch is locked. This ends a sales process and the machine is now ready to use again Accepting coins and repeating a sales process.

As evidenced by Pig. 4 results, the input lines are with 206 and 208. The goods selector switches 188 are in

309835/0353

each designated by 188a to 188f. In the same way, the secondary circuit breakers 192 each have one another same components, each with a goods selector switch assigned. Cam switches 210 have individual switches 210a to 210f. The dispensing mechanism 196 has also individual coils 196a to I96f. Similarly, a series of sold out switches 212a to 212f provided.

Line 208 is to the top of each of the sold out switches 212a to 212f and connected to resistor 214 which is part of one of the secondary power switches forms. The remaining components of each of the secondary power switches have a capacitor 216, the with the resistor 214 \ md with a contact of a goods selector switch 188 is connected. A capacitor 218 is connected to the capacitor 216 and to a diode 220. A triac 222 has a terminal connected in common with the other triaks of the secondary circuit breakers, the is connected to line 224. The other connection Each of the triaks 222 is connected to the lower terminal of a cam holder 210.

A triac 228 has one of its connections to line 224 and its other connection to line tied together. The control electrode of the Tritiks 228 is with a Resistor 230 and then through a capacitor 232 to the Line 206 connected. A capacitor 234 is between the Connections of the triac 228 switched.

The coin input 236 may include a spool 238, which is commonly Part of the coin return electromagnet. A

309835/0 3 53 BATH

Credit switch 240 is shown in its idle state.

A transistor 242 has its anode connected to the connection point connected between resistors 244 and 246. A resistor 248 is connected to the same junction point and to the emitter of a transistor 250. The collector of transistor 250 is connected to the control electrode of a controlled rectifier 252. the Control electrode of controlled rectifier 252 is also with a resistor 254 and then with the line 308 connected. A capacitor 256 is between the lower terminal of the resistor 254 and the anode of the controlled Rectifier 252 connected. The anode of the controlled Rectifier 252 is via a V / iderstand 258 with the Connection point between the resistor 230 and the capacitor 232 connected.

The control electrode of the transistor 242 is connected to the connection point via a resistor 260 and a diode 262 of resistor 264 and capacitor 266 are connected with the lower terminal of the capacitor connected to the line 208 is connected. The upper terminal of the resistor is through a diode 268 to the usually open terminal of the credit switch 240 connected.

A controlled rectifier 270 has its anode connected to line 206 and its cathode connected to a diode connected, with the anode of diode 272 connected to the lead 208 is connected. The control electrode of the controlled rectifier 270 is connected to the via a resistor 274 Cathode of the controlled rectifier 270 connected. the

3 0 9 8 3 5/0353

BATH ORIGINAL

Control electrode of the controlled rectifier 270 is also via a diode 276 and a resistor 278 connected to one terminal of the transistor 242.

The lower terminal of resistor 278 is through a pair Diodes 280 and 282 connected against one another are connected to a resistor 284, which is open in the idle state Switch 286 is connected in parallel. The lower connection of resistor 284 is via resistors 288 and 290 with the line 208 connected.

The connection point between the mutually connected Diodes 280 and 282 are connected to the cathode of diode 292, the anode of which is connected in series with the upper terminal of the switched diodes 294, 296 and 298 is connected. The anode the diode 292 is also connected to the anode of a diode, the cathode of which via a resistor 302 with the Line 208 is connected. The anode of diode 300 is also through a resistor 304 and a diode 306 with a Resistor 308 connected, the upper terminal of which is connected to a terminal of the triac 228.

A controlled rectifier .310 is connected to its cathode with the line 208 and with its control electrode connected to the line 208 via a resistor 312. The control electrode of the controlled rectifier 310 is also across, a neon lamp 314 and a resistor 316 to the Line 318 connected, the other connection with the interconnected Cathodes of the diodes 220 is connected. A V / resistor 320 is connected to the anode of the diode 322, the cathode of which is connected to the anode of the controlled rectifier 310. A capacitor 324 is connected to the

309835/0353 BAD ORjGlNAL

upper connection of the neon lamp 314 and with its "lower . Terminal connected to line 208, while a capacitor 326 with its lower connection with the line 208 and with its upper connection to the line 3I8 connected is.

If an alternating voltage, preferably 110 volts, is first applied to terminals 206 and 208, a current flows via the resistor 249, which is connected with its upper connection to the line 206, via the closed in the closed state Contact of the switch 240, the diode 245, the Resistor 244 and Resistor 246. The anode of transistor 242 is connected to the junction of resistors 244 and 246 and as soon as this connection point becomes positive with respect to the control electrode of transistor 242, so it becomes conductive and a current flows through the resistor 251, the one with the * lower connection of the transistor 242 is connected. Hit the rise in the voltage drop The current flows from the line via the resistor 2 ^ 1 via the coil 2J8 of the coin return solenoid and through the cathode-control electrode path of the controlled rectifier 270 in parallel with the resistor 274 and then through the diode 276, the resistor 278 and via the transistor 242 to the line 206. As soon as this current flow the switch-on conditions of the controlled rectifier 270 is met, this becomes conductive and carries a current through the coil 238 of the coin return solenoid. Becoming leading of the controlled rectifier 270 represents the switching on of the first switch 10, which is already connected with Fig. 3 was described. As soon as current flows through the coil 238, the coin return solenoid turns into a

309835/0353

BATH ORIGINAL

the coins accepting state and the machine is ready for use.

Put the correct number of coins in the coin feeder has been given, the "sale" switch 240 turns off its closed position in the idle state, which is shown in! 4 is shown in its usually open contact closing. Position. This switching of the switch 240 causes the storage capacitor 266 via the diode 268 and the resistor 264 is charged to the supply voltage. At the same time, the one over the transistor 242 and the contact 240 which is closed in the idle state Power interrupted. If the transistor 242 stops conducting, the control current from the control electrode becomes the controlled one Rectifier 270 interrupted and thus the first Switch -170 closed. As a result, the Coin 238 of the coin return solenoid carries current interrupted, which prevents the coin input from accepting more coins, or that the. Coin input possibly returns frozen coins.

In normal operation, switch 240 will quickly return to its idle closed state, whereby the positive voltage at the anode of transistor 242 is built up again. However, transistor 242 can now will not be conductive, since its control electrode is separated from the ground potential due to the blocked diode 262. Therefore, the one at the junction of resistors 244 and 244 increases 246 applied voltage to a greater positive value than was previously possible. This rising positive Potential is given to resistor 250 after this

3 0 9835/0353 SAO ORIGINAL

Potential exceeds about 10 volts, depending on which V / erte were chosen for the various components of the circuit. The! Kitter collector strocke of transistor 250 now becomes conductive and allows current to flow through the Cathode-control electrode path of the controlled rectifier 252.

The controlled by the cathode control electrode path of the Rectifier 252 flowing current "causes this enters its conductive state whenever line 208 is negative with respect to line 206. Of the Current flowing through the controlled rectifier 252 causes the capacitor 2J2 to be charged, thereby causing a negative voltage is built up on the control electrode of the triac 228. This negative voltage on the control electrode of the Triakß generates the necessary bias to control the triac 228 in its conductive state. The Triak 228 works as a main switch and, as soon as this is in is its conductive state, the circuit is ready for sale. It should be noted that at this time the first switch is blocked and the controlled rectifier 270 blocked and turned on of the triac 228 is initiated by the storage capacitor 266 starts charging as soon as switch 240 closes its open contacts

If the triac 228 is conductive, there will be one opposite the line positive voltage across diodes 298, 296 and 294 · to the Goods selector switch 188 given. This series connection of Diodes ensures that even a momentary actuation of one of the goods selection switches is sufficient to activate one of the

309835/0353

secondary performance class in its fully conductive state to convict.

After that the control circuit in the previously described Switching state was brought in, in which this is ready for sale closes any of the Wareri selector switches a current flow from the line 208 via one of the sold-out switches, which are closed in the idle state, via a ' of the coils 196, di ^ r, part of a by magnets or by can be a motor-operated output mechanism, via a cam switch associated with a motor-operated output mechanism to the control electrode of one of the triaks 222. A flowing to the control electrode of the .Triaks 222 Current causes the triac to conduct, which in turn energizes the coil of the dispensing mechanism. As soon as the supply voltage reverses and the triac 222 in its locked Switches state, this is controlled again by a to the control electrode of the triac 222 to the Capacitor 218 and resistor 214 as a result of those in the winding of the motor or of the one driving the dispensing mechanism Electromagnets stored energy flowing current. This way the secondary breaker becomes locked in its conductive state and is therefore independent of the goods selection switch after such has been closed.

The 'becoming conductive of the triac 222 causes the anode of the Diode 220 reaches a positive voltage, whereby a voltage is applied to the Heon lamp 314. Ignites this Lamp, a current flows through the cathode-stener electrode path of the controlled rectifier 310 through which

309835/0353 BAD ORIGINAL ^

Resistor 316, diode 220, triac 222 and triac 228. This current drives the controlled rectifier 310 into its conductive state. After this switching condition has been reached, the positive control voltage for the goods selector switch via the diode 292 with a linked low value so that no further secondary circuit breaker can be controlled. Indeed the controlled rectifier 310 acts as a combinatorial circuit to 'the applied to the goods selector switches Maintain tension at such a level that no further sale can take place, even if another goods selector switch are closed should.

As soon as the controlled rectifier 310 becomes conductive, begins the storage or time capacitor 266 passes through the diode 282, the resistor 284 and the resistor 288 to unload. The control electrode of the controlled rectifier 2? 0 is linked accordingly, thereby triggering is prevented and the capacitor 326 across the Resistor 320 and diode 322 are discharged. As before indicated, "the activation of the link causes the start of the storage cycle, i.e. the discharge of the capacitor 266. Since the hold capacitor 326 during each half cycle is charged again, as long as the triac 228 is in its conductive state, remains the controlled Rectifier 310 conductive.

If the capacitor 266 is sufficiently discharged so that the anode of transistor 242 is positive with respect to its control electrode becomes, this transistor becomes conductive and prevents

309835/0353

- 29 - -. 22Λ7753

that the voltage at the junction of the resistors 244- and 246 increases so far that the emitter-collector path of transistor 250 can become conductive. As previously described, the control current is thereby controlled by the Rectifier 252 kept away, which in turn causes the triac 228 is blocked. In this way, the discharge of the storage capacitor disconnects the main switch "causes. ■ -

When the triak 228 is blocked, the triak 222'i also blocks as soon as the energy stored in the magnetic part of the circuit has flowed away. Is that excited by the coil 196 Mechanics a motor, then a rotating crouch has closed the cam switch, making the motor last so long runs until a complete sequence has ended. The cam switch and the junction point of capacitor J26 and Resistance 320 are so connected that a disturbed Motor either prevents the machine from accepting more coins, which signals a malfunction to the outside world or the other parts of the machine will not be operated unless immediate maintenance work is carried out can be carried out.

As described above, the storage capacitor switches 266 the main switch every now and then, after it is completely discharged, it causes the transistor 242 again becomes conductive, which immediately, as previously described, the controlled rectifier 270 in its conductive State reaches, whereby the entire vending machine comes into a new coin receiving switching state.

309835/0352

" ³ ° ' ■ 12.47753

If an attempt is made to remove goods from an empty compartment, the sold-out switch is in its unlocked position, and no sales process can thus be formed. If a goods selection switch is pressed, then kjin, SJ; your current flows through the controlled rectifier 222 _; and the machine remains in its switching state ready for sale. In this case, the machine can sometimes be left in this switching state ready for sale. Is kej.il sales made by the vending machine, the resistance 29Q discharges the capacitor 266 over a period of 15 to 20 minutes, so that thereafter the machine again% n reaches its coin accepting standby state.

Sometimes a significant voltage drop can occur while the machine is in its ready-to-sell state. This can occur if there is a compressor in the machine is started or other services from. the feed line are required, or an instantaneous Drop in supply voltage occurs. A loss of the Credit signal is prevented by the connection of capacitor 266 in the control circuit of transistor 242. The charge of the capacitor is thus independent of a continuous supply of the supply voltage, so that an interruption in the supply voltage has no effect if the supply voltage is supplied again within about 10 minutes.

An important feature of the output part of the circuit is its inherent self-protection function. üolltf an approximate Short circuit in the dispensing mechanism »uftrffcin, see above the Triak 222 can be controlled in the normal way, however the resulting current flow is on a

309835/0353

or less limited, since there is then no energy in the short-circuited winding, is stored and thus the triac 222 is not locked in its conductive state can be. However, it cannot be controlled again by the goods selector switch, as the control signal is only available for a half-period or less. The usual cable impedance of the vending machine itself and its supply lines limit the current drawn to a corresponding value, the cannot destroy the cabling or the various solid-state components as long as the current is flowing is limited to a maximum of one half cycle of the supply voltage.

Various other of the numerous structural elements that come in conjunction described with the circuit perform important functions. For example, capacitor 247 a derivation of any interference signal «? the coin mechanism. the Diode 272 prevents the coin return magnet from bouncing. The capacitor 256 prevents glitches from happening accidentally can control the controlled rectifier 252, whereby the machine is ready for sale would. The capacitor 234- performs the same function for the Triak 228. The capacitor 324- slows that down Response of the neon lamp 364- to ensure that one the triaks 222 was switched on before the reset process is initiated. The switch that is open in the idle state 286 allows you to choose a sales time if this Switch is closed.

The block diagram shown in Fig. 5 is essentially the same as in Fig. 1, with like parts having like parts

309835/0353

Reference numerals are provided. The only tfete'SSgehied 2wi- see the two block diagrams consists ^; <| arl ^: &, ä & ß a direct connection via a Leilftöig 45 *! wash the timer 40 and the memory 18 is provided. The line 44 connecting the timing circuit and the first switch 10 has been omitted, so that there is no connection originally given by the line 19 between the first switch and the memory 18. In all other parts, however, the block diagrams are the same.

The in J ¹ Xg. The circuit diagram shown in Figure 6 corresponds to that in Pig. 5 block diagram. The circuit is essentially the same as that of FIG. 2, with the exception that the goods selector switches, the feed switches for the electromagnets, the output electromagnets and the sold-out switches are not shown again. Identical parts have the same reference numerals. Diodes 98 and 122 of FIG. 2, as well as neon lamp 1J8 and resistors 100, 136 and 142 have been omitted. In the same way, capacitors 134 and 140 have been omitted. There are two additions, however. A resistor 3 ^ 0 has its terminal connected to the lower terminal of the capacitor 112 and its other terminal to the credit switch 126. A second resistor 5 ^ 2 is connected between the upper connection of the resistor 110 and the cathode of the diode 144 * In all other parts, the circuits of FIGS. 2 and 6 correspond to one another.

The controlled rectifier 124 in the circuit shown in FIG. 2 performs the function of the first switch ams, so that

309835/0383

BATH ORIGINAL

when the controlled rectifier is conducting, supply voltage is given to the coin return electromagnet, so that Coins can be inserted. The controlled rectifier 124 performs this function in the case of FIG. 6 shown However, the circuit does not go through. Is therefore supply voltage via lines 70 and 72 to the control circuit given, a current flows through the resistor 11U, the resistor 342, the diode 120 and the coil 116. How previously prevented a diode. 118 bouncing during the first half cycle of the applied AC voltage. The coin return electromagnet is therefore excited via the coil 116 and coins can be inserted.

Have the correct coins been entered and with it the credit signal? generated, the credit switch causes the storage capacitor to be charged and charged Capacitor switches on the main switch as described above. However, it flows through resistor 34-2 Current now flows through diode 144 instead of diode 120, with the result that the coin return electromagnet is switched off and thus no more coins can be entered until a sales transaction has taken place. In this way, the diodes 120 and 144 perform the operation of the first holder 10.

The circuit then continues to operate as described in connection with the circuit shown in FIG. 2, inclusive the discharge of the capacitor 90. However, at the end of the sales process, after the capacitor 90 was discharged, the main switch and the controlled rectifier switched off via the controlled rectifier 124

309835/0353

124 switched off. A current then flows through the resistor 542 and diode 120 and through, coil 116 of the coin return magnet. This way, the coin return solenoid becomes energized again and the control circuit is again in its coin-accepting switching state. Of the controlled rectifier 124 operates as part of the buckling or timer for the memory and not as the first switch 10.

30983570353

Claims (1)

Claims Control circuit for a vending machine with a coin input, a goods selector switch and an electrically "operated goods output, characterized in that the control circuit has a first switch (10, 170) formed from solid-state components for the connections (70, 72; 206, 208 ) of the control circuit, which when a supply voltage is applied to the control circuit is switched on, after which the coin input (14, 17 ^) ΐ- ^{η reaches} a coin-accepting state that a memory (18, 178) connected to the coin input is provided and that a second switch (22, 1 x 84) 'formed from solid-state components for the supply voltage is connected to the memory and can be switched on when the memory is actuated, the first switch being switched off when the second switch is switched on, whereby a voltage for the goods selector switch (30, 188) and the goods issue (36, 196) can be generated. 2. Control circuit according to claim 1, characterized in that a connection (24, 180) between the first (10, 170) and second switches (22, 184) are provided is, via which the first switch can be switched off when the second switch is switched on. 30 983 5/03 53 BAD ORlGfNAt 5. Control circuit according to claim 2, characterized in that a timing circuit (40, 266) is connected to the first switch (10, 170) with which the first switch can be switched on when the V7aren selector switch C30, 188) does not follow one predetermined time interval after the second switch has been switched on
(22, 10'O was pressed. 4. Control circuit according to claim 2, thereby g e k e η η ζ e i c h 11 e t that the second switch (22, 184) has a controlled rectifier (228). 5. Control circuit according to claim 2, characterized in that g e k e η η that the second switch (22, 184) comprises a pair of controlled rectifiers (82, 84), which at alternating half-periods of the applied supply voltage work. 6. Control circuit according to claim 2 and 5, characterized in that the memory (18, 178) has a Capacitor (90, 266) for generating the control voltage for the second switch (82, 84; 228). 7- control circuit according to one of claims 2 to 6, characterized in that a filter network (74, 76, 78, 80) between the supply voltage source and the
second switch (82, 84) is provided with which an immediate response of the second switch when the supply voltage is applied to the control circuit can be prevented. 309835/0353 BAD OfHQtNAL 8. Control circuit according to one of .Ansprüche 2 to 7t, characterized by "a timer (140, 142) with which a predetermined time interval after actuation of the goods dispenser (36) the first switch (124) and 'the second' switch (82 , 84) can be switched off. 9 · Control circuit according to one of claims 2 to 8, characterized characterized in that made of solid-state components formed circuit breakers (32, 192) with the second switch (22, 184) and the goods selection switches (30, 188) are connected, which upon actuation the goods selector switch in the conductive state are switchable to give supply voltage to the electrically operated goods dispenser (36, 196) «. 10. Control circuit according to claim 9, characterized in that when the goods selector switch is actuated (30, 188) from the second switch (22, 184) the voltage given to the goods selector switch can be reduced is to prevent further goods issue when an additional goods selector switch is actuated. 11. Control circuit according to claim 10, characterized in that the solid-state components formed Circuit breakers (32, 192) each have a controlled silicon rectifier (54, 222) which is connected to one of the goods selector switches (30, 188). 3Q9835 / 03S3 BAD ORIGINAL * 12. Control circuit according to claim 1, characterized in that upon actuation of the memory (18, 178) depending on a coin slot! 'Der the first switch (10, 170) can be switched off and the second switch (22, 184) can be switched on. 13. Control circuit according to claim 12, characterized in that a -Linking circuit (200) with the goods selector switches (188), the first switch (170) and the memory (178) is connected _f wherein the actuation of a Goods selector switch causes the logic circuit to change the voltage given to the goods selector switch, in order to prevent an additional goods issue when a second goods selector switch is actuated. Control circuit according to Claim 13, characterized in that g e Ic en η that formed from solid-state components te circuit breaker (92) with the goods selector switches (188) and with the logic circuit (200) are connected, wherein the actuation of a goods selector switch a the circuit breaker switches on, which in turn switches on the logic circuit. Control circuit according to Claim 14, characterized in that g e k e η η ζ e i c h η e t that the activation of the logic circuit (200) causes an actuation of the memory (178) to turn off the second switch (184) and the turn on the first switch (170). 309835/0353 16. Control circuit according to claim 14 ·, characterized in that the activation of the Yertoiüpf! Mgsoppel (200) prevents actuation of the first switch (170) during a predetermined time interval » 17- control circuit according to claim 12, characterized by several 'formed from solid-state components' Circuit breakers (222) with the goods selector switches (188) are connected, and that the second switch (184) has a triac (228), which is common to each of the Circuit breaker is connected " 18. Control circuit according to claim 17? characterized in that each of the circuit breakers (222) pick up a triac 19. Control circuit according to Claim 12 _9, characterized in that the first switch (1O ₅ 170} opens a controlled silicon rectifier (82, 84; 270). 20. Control circuit according to claim 12, characterized in that a second timing circuit (104; 266, 290) for returning the first switch (10, 170) to its conductive state and the second switch (22 ₉ 184-) to its blocked state, after the second switch has remained in its conductive state without a commodity selector switch (30, 188) being actuated for a predetermined time interval. 309835/0353 BATH ORIGINAL Blank page