EP0725372A1 - Thermal protection device for franking machine - Google Patents

Thermal protection device for franking machine Download PDF

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Publication number
EP0725372A1
EP0725372A1 EP96400174A EP96400174A EP0725372A1 EP 0725372 A1 EP0725372 A1 EP 0725372A1 EP 96400174 A EP96400174 A EP 96400174A EP 96400174 A EP96400174 A EP 96400174A EP 0725372 A1 EP0725372 A1 EP 0725372A1
Authority
EP
European Patent Office
Prior art keywords
threshold
fuse
switch
ambient temperature
low
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96400174A
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German (de)
French (fr)
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EP0725372B1 (en
Inventor
Jean-Pierre Ozanne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Quadient Technologies France SA
Original Assignee
Neopost Technologies SA
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Publication date
Application filed by Neopost Technologies SA filed Critical Neopost Technologies SA
Publication of EP0725372A1 publication Critical patent/EP0725372A1/en
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Publication of EP0725372B1 publication Critical patent/EP0725372B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00185—Details internally of apparatus in a franking system, e.g. franking machine at customer or apparatus at post office
    • G07B17/00193—Constructional details of apparatus in a franking system
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
    • G07B17/00—Franking apparatus
    • G07B17/00185—Details internally of apparatus in a franking system, e.g. franking machine at customer or apparatus at post office
    • G07B17/00193—Constructional details of apparatus in a franking system
    • G07B2017/00233—Housing, e.g. lock or hardened casing

Definitions

  • the invention relates to permanent thermal protection of the circuits of an electronic device, in particular the circuits of a secure franking machine.
  • the electronic circuits of a franking machine are generally installed inside an enclosure protected against unauthorized access, for example using a sealed hatch. They are used in particular for the accounting of postal values.
  • Some users of such an electronic postage meter do not hesitate to place their machine in a freezer for example, to damage the circuits of the machine in order to avoid paying the Postal Administration the sum of the postal values recorded by these circuits.
  • a device for detecting the crossing of a predetermined temperature threshold inside the enclosure in particular a threshold located in low temperatures, in order to prohibit the subsequent use of this machine after such a crossing.
  • the object of the invention is to propose such a device which is easy to industrialize from commercial components having a low cost and which is precise and reliable.
  • the subject of the invention is a device comprising, inside a protected enclosure, a thermostatic switch with double tripping threshold capable of opening when the ambient temperature is below a low threshold and at stay open as long as the ambient temperature is below a high threshold above the low threshold.
  • the device also includes a thermal fuse opening when the ambient temperature is above a breaking threshold between the threshold low and the high threshold.
  • the assembly consisting of the switch and the fuse is mounted so as to cut an electrical path in a non-reversible manner when the ambient temperature is outside a range of operating temperatures of the device defined between the low threshold and the breaking point.
  • the invention is in particular based on the idea of making irreversible, by breaking a thermal fuse, the erasure of an attempted fraud by the cold.
  • FIG. 1 schematically shows the device according to the invention.
  • FIGS 2 and 3 illustrate the operation of the device according to the invention.
  • the protected enclosure 1 of a franking machine contains an electronic circuit 2 like a microprocessor and the thermal protection device according to the invention.
  • This circuit 2 can be part of the postal value accounting circuits of the machine.
  • the thermal protection device comprises a thermostatic switch 3 with double tripping threshold and a thermal fuse 4 with single tripping threshold.
  • the thermostatic switch 3 is a switch which has a relatively wide hysteresis range, for example between -20 ° C and 80 ° C. In particular, this is the component called “VIGITHERME”, model “M16”, sold by the company HEITO.
  • the thermal fuse 4 is chosen to rupture at approximately 75 ° C.
  • the component “D076-002” sold by the company “ELMWOOD SENSORS Inc” is suitable here.
  • the switch 3 and the fuse 4 are mounted so as to cut an electrical path in a non-reversible manner when the ambient temperature inside enclosure 1 is located outside of an operating temperature range of the device defined between the low threshold SB of the switch (here -20 ° C) and the breaking threshold ST of the fuse (here 75 ° C ).
  • the switch 3 is mounted on a first electrical path 5 between a first terminal A and a second terminal B of the circuit 2.
  • the fuse 4 is mounted on a second electrical path 6, partly common with the path 5, between the first terminal A and a third terminal C of circuit 2.
  • the switch 3 closes the path 5.
  • the switch 3 opens the path 5, this switch remaining open as long as the ambient temperature is below the high threshold SH which is higher than the low threshold SB.
  • the switch 3 closes the path 5. It is therefore understood that the switch 3 opens and closes reversibly.
  • the fuse 4 closes the path 6.
  • the fuse 4 opens the path 6 in a non-reversible manner.
  • the switch 3 opens the path 5 and the signal Vcc will be received on terminal B of circuit 2. This corresponds to unauthorized use of the machine. If an attempt is made to restore the closed state of the switch 3 by increasing the ambient temperature beyond the high threshold SH, one necessarily crosses the breaking threshold ST, which causes the irreversible breaking of the fuse 4 and the opening of the path 6, so that the signal Vcc will be received on terminal C of circuit 2. This also corresponds to unauthorized use of the machine.
  • the positioning of the high threshold SH slightly higher than the rupture threshold ST makes it possible to keep a trace of the crossing of the low threshold SB of ambient temperature, this crossing of threshold being detectable by the circuit 2 to prevent the subsequent use of machine.
  • the machine can only operate if the circuit 2 does not detect the presence of the signal Vcc on one of the terminals B or C. If by mistake, the fuse 4 or the switch 3 is not mounted in the machine, circuit 2 will detect the presence of the signal Vcc at the corresponding terminal of the missing element and will prevent the operation of the machine. Note also that the switch and the fuse can just as well be put in series on a single electrical path to detect that the low temperature threshold SB has been exceeded.

Abstract

The detection system includes a thermostatic switch (3) and fuse (4) having double and single temp. thresholds respectively. The switch and the fuse are placed in a secured enclosure (1). The switch has hysteresis over a relatively wide range e.g. between -20 and +80 deg.C. The fuse is chosen to melt at about 75 deg.C. The switch is wired (5) between two terminals (A, B) of a microprocessor circuit. The fuse is connected between the first and third terminals (A, C). A check voltage (Vcc) of high logic level (e.g. 5 V) is applied to the second and third terminals via resistors (7, 8).

Description

L'invention concerne la protection thermique permanente des circuits d'un appareil électronique, notamment les circuits d'une machine à affranchir sécurisée.The invention relates to permanent thermal protection of the circuits of an electronic device, in particular the circuits of a secure franking machine.

Les circuits électroniques d'une machine à affranchir sont généralement installés à l'intérieur d'une enceinte protégée contre des accès non autorisés, par exemple à l'aide d'une trappe plombée. Ils servent notamment à la comptabilisation de valeurs postales.The electronic circuits of a franking machine are generally installed inside an enclosure protected against unauthorized access, for example using a sealed hatch. They are used in particular for the accounting of postal values.

Certains utilisateurs d'une telle machine à affranchir électronique n'hésitent pas à placer leur machine dans un congélateur par exemple, pour détériorer les circuits de la machine afin d'éviter de payer à l'Administration postale la somme des valeurs postales comptabilisées par ces circuits.Some users of such an electronic postage meter do not hesitate to place their machine in a freezer for example, to damage the circuits of the machine in order to avoid paying the Postal Administration the sum of the postal values recorded by these circuits.

Pour empêcher ce genre de fraude, on prévoit à l'intérieur de l'enceinte protégée de chaque machine, un dispositif pour détecter le franchissement d'un seuil prédéterminé de température à l'intérieur de l'enceinte, en particulier un seuil situé dans les basses températures, en vue d'interdire l'utilisation ultérieure de cette machine après un tel franchissement.To prevent this type of fraud, there is provided inside the protected enclosure of each machine, a device for detecting the crossing of a predetermined temperature threshold inside the enclosure, in particular a threshold located in low temperatures, in order to prohibit the subsequent use of this machine after such a crossing.

Le but de l'invention est de proposer un tel dispositif qui soit facile à industrialiser à partir de composants du commerce ayant un faible coût et qui soit précis et fiable.The object of the invention is to propose such a device which is easy to industrialize from commercial components having a low cost and which is precise and reliable.

A cet effet, l'invention a pour objet un dispositif comprenant, à l'intérieur d'une enceinte protégée, un interrupteur thermostatique à double seuil de déclenchement apte à ouvrir quand la température ambiante se situe en dessous d'un seuil bas et à rester ouvert tant que la température ambiante se situe en dessous d'un seuil haut supérieur au seuil bas. Le dispositif comprend aussi un fusible thermique ouvrant quand la température ambiante se situe au dessus d'un seuil de rupture compris entre le seuil bas et le seuil haut. L'ensemble constitué de l'interrupteur et du fusible est monté de telle manière à couper un trajet électrique de façon non réversible quand la température ambiante se situe en dehors d'une plage de températures de fonctionnement de l'appareil définie entre le seuil bas et le seuil de rupture.To this end, the subject of the invention is a device comprising, inside a protected enclosure, a thermostatic switch with double tripping threshold capable of opening when the ambient temperature is below a low threshold and at stay open as long as the ambient temperature is below a high threshold above the low threshold. The device also includes a thermal fuse opening when the ambient temperature is above a breaking threshold between the threshold low and the high threshold. The assembly consisting of the switch and the fuse is mounted so as to cut an electrical path in a non-reversible manner when the ambient temperature is outside a range of operating temperatures of the device defined between the low threshold and the breaking point.

L'invention est en particulier basée sur l'idée de rendre irréversible, par rupture d'un fusible thermique, l'effacement d'une tentative de fraude par le froid.The invention is in particular based on the idea of making irreversible, by breaking a thermal fuse, the erasure of an attempted fraud by the cold.

Un exemple de réalisation de l'invention est maintenant décrit plus en détails ci-après en référence aux dessins.An exemplary embodiment of the invention is now described in more detail below with reference to the drawings.

La figure 1 montre schématiquement le dispositif selon l'invention.Figure 1 schematically shows the device according to the invention.

Les figures 2 et 3 illustrent le fonctionnement du dispositif selon l'invention.Figures 2 and 3 illustrate the operation of the device according to the invention.

Figure 1, l'enceinte protégée 1 d'une machine à affranchir (non représentée) renferme un circuit électronique 2 comme un microprocesseur et le dispositif de protection thermique selon l'invention. Ce circuit 2 peut faire partie des circuits de comptabilisation de valeurs postales de la machine.Figure 1, the protected enclosure 1 of a franking machine (not shown) contains an electronic circuit 2 like a microprocessor and the thermal protection device according to the invention. This circuit 2 can be part of the postal value accounting circuits of the machine.

Le dispositif de protection thermique comprend un interrupteur thermostatique 3 à double seuil de déclenchement et un fusible thermique 4 à simple seuil de déclenchement.The thermal protection device comprises a thermostatic switch 3 with double tripping threshold and a thermal fuse 4 with single tripping threshold.

L'interrupteur thermostatique 3 est un interrupteur qui a une plage d'hystérésis relativement large comprise par exemple entre -20°C et 80°C. En particulier, il s'agit du composant dénommé "VIGITHERME", modèle "M16", vendu par la société HEITO. Le fusible thermique 4 est choisi pour rompre à environ 75°C. Le composant "D076-002" vendu par la société "ELMWOOD SENSORS Inc" convient bien ici.The thermostatic switch 3 is a switch which has a relatively wide hysteresis range, for example between -20 ° C and 80 ° C. In particular, this is the component called "VIGITHERME", model "M16", sold by the company HEITO. The thermal fuse 4 is chosen to rupture at approximately 75 ° C. The component "D076-002" sold by the company "ELMWOOD SENSORS Inc" is suitable here.

L'interrupteur 3 et le fusible 4 sont montés de telle manière à couper un trajet électrique de façon non réversible quand la température ambiante à l'intérieur de l'enceinte 1 se situe en dehors d'une plage de températures de fonctionnement de l'appareil définie entre le seuil bas SB de l'interrupteur (ici -20°C) et le seuil de rupture ST du fusible (ici 75°C).The switch 3 and the fuse 4 are mounted so as to cut an electrical path in a non-reversible manner when the ambient temperature inside enclosure 1 is located outside of an operating temperature range of the device defined between the low threshold SB of the switch (here -20 ° C) and the breaking threshold ST of the fuse (here 75 ° C ).

Plus particulièrement, l'interrupteur 3 est monté sur un premier trajet électrique 5 entre une première borne A et une seconde borne B du circuit 2. Le fusible 4 est monté sur un second trajet électrique 6, en partie commun avec le trajet 5, entre la première borne A et une troisième borne C du circuit 2.More particularly, the switch 3 is mounted on a first electrical path 5 between a first terminal A and a second terminal B of the circuit 2. The fuse 4 is mounted on a second electrical path 6, partly common with the path 5, between the first terminal A and a third terminal C of circuit 2.

Figure 2, tant que la température ambiante à l'intérieur de l'enceinte reste supérieure au bas SB montré sur l'axe a) de températures, l'interrupteur 3 ferme le trajet 5. Quand la température ambiante se situe en dessous du seuil bas SB, l'interrupteur 3 ouvre le trajet 5, cet interrupteur restant ouvert tant que la température ambiante se situe en dessous du seuil haut SH qui est supérieur au seuil bas SB. Dès que la température ambiante franchit le seuil haut SH, l'interrupteur 3 referme le trajet 5. On comprend donc que l'interrupteur 3 s'ouvre et se ferme de façon réversible.Figure 2, as long as the ambient temperature inside the enclosure remains above the low SB shown on the temperature axis a), the switch 3 closes the path 5. When the ambient temperature is below the threshold low SB, the switch 3 opens the path 5, this switch remaining open as long as the ambient temperature is below the high threshold SH which is higher than the low threshold SB. As soon as the ambient temperature crosses the high threshold SH, the switch 3 closes the path 5. It is therefore understood that the switch 3 opens and closes reversibly.

Par ailleurs, tant que la température ambiante reste inférieure au seuil de rupture ST montré sur l'axe b) de températures compris entre le seuil bas SB et le seuil haut SH, le fusible 4 ferme le trajet 6. Quand la température franchit le seuil de rupture ST, le fusible 4 ouvre le trajet 6 de façon non réversible.Furthermore, as long as the ambient temperature remains below the rupture threshold ST shown on axis b) of temperatures between the low threshold SB and the high threshold SH, the fuse 4 closes the path 6. When the temperature crosses the threshold ST, the fuse 4 opens the path 6 in a non-reversible manner.

Figure 3, si un signal de contrôle Vcc (ayant un niveau logique haut, par exemple un tension continue de 5 volts) est envoyé sur les bornes B et C du circuit 2 à travers des résistances respectivement 7 et 8 (la borne A étant relié à la masse), il ne sera neutralisé que si la température ambiante à l'intérieur de l'enceinte reste comprise entre le seuil bas SB et le seuil de rupture ST qui définissent la plage de fonctionnement normal P de la machine montrée sur l'axe c) de températures à la figure 2. Dans cette plage de températures, l'interrupteur 3 et le fusible 4 sont fermés de sorte qu'aux bornes B et C, la tension est de 0 volt.Figure 3, if a control signal Vcc (having a high logic level, for example a DC voltage of 5 volts) is sent to terminals B and C of circuit 2 through resistors 7 and 8 respectively (terminal A being connected earth), it will only be neutralized if the ambient temperature inside the enclosure remains between the low threshold SB and the rupture threshold ST which define the normal operating range P of the machine shown on the axis c) of temperatures in Figure 2. In this temperature range, the switch 3 and the fuse 4 are closed so that at terminals B and C, the voltage is 0 volts.

Si la température ambiante passe en dessous du seuil bas SB, l'interrupteur 3 ouvre le trajet 5 et le signal Vcc sera reçu sur la borne B du circuit 2. Ceci correspond à une utilisation non autorisée de la machine. Si on tente de rétablir l'état fermé de l'interrupteur 3 en augmentant la température ambiante au delà du seuil haut SH, on franchit nécessairement le seuil de rupture ST, ce qui provoque la rupture irréversible du fusible 4 et l'ouverture du trajet 6, de sorte que le signal Vcc sera reçu sur la borne C du circuit 2. Ceci correspond aussi à une utilisation non autorisée de la machine.If the ambient temperature drops below the low threshold SB, the switch 3 opens the path 5 and the signal Vcc will be received on terminal B of circuit 2. This corresponds to unauthorized use of the machine. If an attempt is made to restore the closed state of the switch 3 by increasing the ambient temperature beyond the high threshold SH, one necessarily crosses the breaking threshold ST, which causes the irreversible breaking of the fuse 4 and the opening of the path 6, so that the signal Vcc will be received on terminal C of circuit 2. This also corresponds to unauthorized use of the machine.

On comprend donc que le positionnement du seuil haut SH légèrement supérieur au seuil de rupture ST permet de conserver une trace du franchissement du seuil bas SB de température ambiante, ce franchissement de seuil étant détectable par le circuit 2 pour empêcher l'utilisation ultérieure de la machine.It is therefore understood that the positioning of the high threshold SH slightly higher than the rupture threshold ST makes it possible to keep a trace of the crossing of the low threshold SB of ambient temperature, this crossing of threshold being detectable by the circuit 2 to prevent the subsequent use of machine.

Il est entendu que la machine ne peut fonctionner que si le circuit 2 ne détecte pas la présence du signal Vcc sur l'une des bornes B ou C. Si par erreur, le fusible 4 ou l'interrupteur 3 n'est pas monté dans la machine, le circuit 2 détectera la présence du signal Vcc à la borne correspondante de l'élément manquant et empêchera le fonctionnement de la machine. A noter aussi, que l'interrupteur et le fusible peuvent tout aussi bien être mis en série sur un seul trajet électrique pour détecter le dépassement du seuil de température bas SB.It is understood that the machine can only operate if the circuit 2 does not detect the presence of the signal Vcc on one of the terminals B or C. If by mistake, the fuse 4 or the switch 3 is not mounted in the machine, circuit 2 will detect the presence of the signal Vcc at the corresponding terminal of the missing element and will prevent the operation of the machine. Note also that the switch and the fuse can just as well be put in series on a single electrical path to detect that the low temperature threshold SB has been exceeded.

Claims (3)

Un dispositif pour détecter le franchissement d'un seuil prédéterminé de température par les circuits d'un appareil électronique sécurisé, notamment ceux d'une machine à affranchir, en vue d'interdire l'utilisation ultérieure de cet appareil après un tel franchissement, ce dispositif comprenant, à l'intérieur d'une enceinte protégée (1), un interrupteur thermostatique (3) à double seuil de déclenchement apte à ouvrir quand la température ambiante se situe en dessous d'un seuil bas (SB) et à rester ouvert tant que la température ambiante se situe en dessous d'un seuil haut (SH) supérieur au seuil bas, un fusible thermique (4) ouvrant quand la température ambiante se situe au dessus d'un seuil de rupture (ST) compris entre le seuil bas et le seuil haut, l'interrupteur et le fusible étant montés de telle manière à couper un trajet électrique de façon non réversible quand la température ambiante se situe en dehors d'une plage de températures de fonctionnement de l'appareil définie entre le seuil bas (SB) et le seuil de rupture (ST).A device for detecting the crossing of a predetermined temperature threshold by the circuits of a secure electronic device, in particular those of a franking machine, with a view to prohibiting the subsequent use of this device after such a crossing, this device comprising, inside a protected enclosure (1), a thermostatic switch (3) with double triggering threshold capable of opening when the ambient temperature is below a low threshold (SB) and of remaining open as long as the ambient temperature is below a high threshold (SH) greater than the low threshold, a thermal fuse (4) opening when the ambient temperature is above a rupture threshold (ST) between the threshold low and high threshold, the switch and the fuse being mounted so as to cut an electrical path in a non-reversible manner when the ambient temperature is outside a range of operating temperatures. t of the device defined between the low threshold (SB) and the rupture threshold (ST). Le dispositif selon la revendication 1, dans lequel le trajet électrique relie l'interrupteur thermostatique et le fusible à au moins deux bornes (B, C) d'un circuit de contrôle (2) qui détecte un franchissement de seuil de température s'il reçoit sur l'une des ces deux bornes un signal de contrôle (Vcc) injecté sur le trajet électrique.The device according to claim 1, in which the electrical path connects the thermostatic switch and the fuse to at least two terminals (B, C) of a control circuit (2) which detects a crossing of a temperature threshold if it receives on one of these two terminals a control signal (Vcc) injected into the electrical path. Le dispositif selon la revendication 2, dans lequel le circuit de contrôle (2) fait partie des circuits de l'appareil à l'intérieur de l'enceinte protégée.The device according to claim 2, in which the control circuit (2) is part of the circuits of the device inside the protected enclosure.
EP19960400174 1995-01-31 1996-01-25 Thermal protection device for franking machine Expired - Lifetime EP0725372B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9501107 1995-01-31
FR9501107A FR2730102B1 (en) 1995-01-31 1995-01-31 THERMAL PROTECTION DEVICE FOR POSTAGE MACHINE

Publications (2)

Publication Number Publication Date
EP0725372A1 true EP0725372A1 (en) 1996-08-07
EP0725372B1 EP0725372B1 (en) 2004-12-01

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EP19960400174 Expired - Lifetime EP0725372B1 (en) 1995-01-31 1996-01-25 Thermal protection device for franking machine

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EP (1) EP0725372B1 (en)
DE (1) DE69633956T2 (en)
FR (1) FR2730102B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116228174B (en) * 2023-05-09 2023-08-01 北京惠朗时代科技有限公司 Management method of printing control instrument with intelligent recognition function

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035756A (en) * 1976-01-26 1977-07-12 Therm-O-Disc Incorporated Two temperature thermostat
US4285050A (en) * 1979-10-30 1981-08-18 Pitney Bowes Inc. Electronic postage meter operating voltage variation sensing system
US4301507A (en) * 1979-10-30 1981-11-17 Pitney Bowes Inc. Electronic postage meter having plural computing systems
WO1992020085A1 (en) * 1991-04-26 1992-11-12 Secap Device providing thermal protection in a limited temperature range

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035756A (en) * 1976-01-26 1977-07-12 Therm-O-Disc Incorporated Two temperature thermostat
US4285050A (en) * 1979-10-30 1981-08-18 Pitney Bowes Inc. Electronic postage meter operating voltage variation sensing system
US4301507A (en) * 1979-10-30 1981-11-17 Pitney Bowes Inc. Electronic postage meter having plural computing systems
WO1992020085A1 (en) * 1991-04-26 1992-11-12 Secap Device providing thermal protection in a limited temperature range

Also Published As

Publication number Publication date
EP0725372B1 (en) 2004-12-01
DE69633956T2 (en) 2005-12-01
FR2730102B1 (en) 1997-04-18
FR2730102A1 (en) 1996-08-02
DE69633956D1 (en) 2005-01-05

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