TECHNICAL FIELD

The present invention relates to a lockable cassette, and more particularly to a lockable cassette, box or the like intended for valuable papers and/or valuable articles.

BACKGROUND PRIOR ART

Devices intended for the safe storage of banknotes and their transportation between different localities,- such as shops, banks and post-office localities, etc., are known to the art. For example, the European Patent Specification 0004436 describes a banknote handling device, namely a lockable cassette. This cassette is provided with a lockable lid and is adapted for insertion into a housing. When removed from the housing, the cassette is closed and locked and when inserted into the housing a latch which latches a member in the lid is moved to a non-latching position, provided that given electrical activation takes place in accordance with a pre-set program. This activation involves the mutual co-action of components belonging to the cassette and to the. housing this co-action causing a signal of given value or pattern to be delivered to an electric locking device in the cassette in accordance with the set program. This value or pattern has a direct relationship with a locking code selected for the cassette.

A certain amount of criticism has been levelled against arrangements of this kind, to the effect that the number of possible locking codes available is too restricted, accompanied with the risk of unauthorized de-coding, and that the procedure required to change a locking code is too complicated. An increased memory capacity for storing various kindsof information is also desirable.

DISCLOSURE OF THE INVENTION

The object of the invention is to provide a cassette which will avoid such criticisms and which despite an increased coding and information-storage capacity can be produced at competitive prices.

A cassette, box or the like of the aforesaid kind incorporates, in accordance with the invention, a locking arrangement which includes a programmable memory, a comparison circuit, and a logic circuit.

The memory is constructed so that when the cassette is removed from a housing the memory is accessible externally for programming in the absence of disturbing or destructive measures.

In addition, when in operation it is arranged to feed series of pulses to the comparison circuit.

The comparison circuit is intended for the comparison of pulses fed from the memory and a series of pulses (locking code) fed into the locking arrangement from without.

In the absence of agreement between two pulses, the logic circuit is effective in blocking the opening function of the locking .arrangement, this blocking of the locking arrangement being unnoticeable until a comparison has been made on the whole series of pulses. When-agreement is found between all pulses (e.g. 24 pulses), the opening function of the locking arrangement is activated.

BRIEF DESCRIPTION OF THE DRAWING

The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 1 illustrates schematically the outer contours of a cassette housing according to an earlier known construction, and Figure 2 illustrates a circuit card incorporated in the cassette according to Figure 1.

PREFERRED EMBODIMENT

The cassette 10 illustrated in Figure 1 comprises an elongated box having an upper end which is covered by a laterally (outwardly) displaceable lid 11. When the cassette is removed from a housing 20, the lid 11 is latched against lateral displacement by the upper part 121 of an operating means 12. (This part 121 thus engages a stop 111 in the lid and the operating means 12 is prevented from downward movement by a latch 13, which adopts a vertical position.) When the cassette is inserted into the housing 20, as illustrated in Figure 1, the operating means 12 can be moved downwards,the part 121 is free from the stop 111, and the lid 11 can be drawn out. Banknotes present in the cassette can therewith be made accessible to a cashier or a customer with the aid of a withdrawal means, although while the lid is withdrawn it is impossible to withdraw the cassette from the housing 20, due to the presence of a latch 16, which comes into operation as the operating means 12 is moved downwards.

Before the lid 11 can be drawn out it is necessary for-a contact or switch part 15 in the cassette to co-act with a contact or switch part 25-in the housing 20 upon insertion of the cassette 11 into the housing 20, so that a signal produced, for example, from an external data processor enters the circuit card 17 of a locking arrangement 17-14 via the contact parts 25 and 15. If this signal has, or gives rise to a given value or pattern which coincides with a corresponding value or pattern in a memory 171 (see Figure 2) in the card 17, an operating signal is sent from the card to a-relay 14, the armature of which with latch 13 mechanicallyactiva- tes the lower part122 of the operating means 12. When the lid is closed and the cassette withdrawn from the housing, the armature-is positioned vertically and engages a recess or notch in the part 122, thereby to latch the operating means 12. Figure 1 illustrates the situation in which the cassette 10 is inserted correctly in the housing 20 and a correct "unlocking signal" is fed to the card 17, so that the relay 14 is energized and the latch 13 is moved out of its latching position. The lid can then be drawn out.

In addition to the programmable memory 171 the circuit card 17 of the locking arrangement 17-14 also incorporates a comparison circuit 172 and a logic circuit 173, of Figure 2.

The memory 171 is arranged to store information such as the serial number of the cassette, the kind of banknotes and the number thereof contained in the cassette, the width of the banknotes, the value of the banknotes, etc., this information being written into and read from the memory via input/output 22. The information is read from the memory via the output 22 and a circuit-card output 37. The locking code is written-in via an input/ output 23, which is also used to transfer the locking code to the comparison circuit 172. In addition to these input/outputs, the memory also incorporates an input 24 for start-reset signals from a circuit-card input 27, an input 25 for clock signals and-an input 21 for signals effective to transfer information stored temporarily in one part of the memory to another part of the memory for permanent storage of information (independent of voltages).

Information, such as serial number, etc., is programmed via a circuit-card input _-33 and a buffer circuit 34 to the input 22. The locking code is inserted, -or programmed, via a circuit-card input 28 and a buffer circuit 35 to the input 23. Thus, in short, information is programmed by feeding-in a start pulse on the circuit input 27 and transferring the pulse to the input 24; information and code pulses are fed-in on the input 33 and 28 respectively and transferred to the respective input 22 and 23; clock signals are fed to the input 25; additional information and code pulses are fed to the respective input 33 and 28 with intermediate clock signals to the input 25; a signal is then fed to the input 21 for permanent storage of the earlier, temporarily stored information and code signal.

The memory 17 is also constructed so that when the cassette 10 is withdrawn from the housing 20 and opened by an authorized person with the aid of the relevant locking code, the memory is accessible for programming from without (via a switch in a programming box), without needing to first take disturbing or destructive measures. The memory is also adapted for the series infeed of pulses to the comparison circuit 172, thereby greatly decreasing the need for comparison circuits.

The comparison circuit 172 is arranged to compare pulses, pulse for pulse, fed-out of the memory 171 via the output 23 and a series of pulses (locking code) fed-in from an external source to an input 26 in the circuit card; in the event of a correct code pulse a comparison results in a signal to the logic circuit 173 via output 29.

The logic circuit 173 is effective to cause blocking of the opening function of the locking arrangement (via an output.30) in the absence of agreement between two pulses in the comparison circuit, i.e. no current is supplied to the relay 14 in Figure 1, this blocking of the opening function, however, does not become noticeable externally until the whole series of pulses has been compared. This reduces the risk of the locking code being unlawfully manipulated. One input 32 is connected to the input 27 on the circuit card for resetting pulses.