CARD READ/WRITE DEVICE

Abstract: A card read/write device comprises a frame (10) having a card insertion opening (11a), electrode terminals (23a, 24a) arranged to correspond to electrodes (C1) provided on a card (C), a disconnection mechanism (20) for moving the electrode terminals (23a, 24a) towards and away from the electrodes (C1) of the card (C). The disconnection mechanism (20) is rotatably mounted on the frame (10) and comprises contact members (23, 24) having electrode terminals (23a, 24a), transfer levers (25, 26) interlocked with insertion of the card (C) for permitting the electrode terminals (23a, 24a) to contact the electrodes (C1) of the card (C) and a spring (27) for urging the contact members (23, 24) in a direction such as to move the contact members (23, 24) away from the card.

Description: The present invention relates to a card read/write device enabling data write/read operations to be carried out for a card such as an IC card having electrodes on both surfaces thereof, especially to one having a disconnection mechanism of electrode terminals interlocked with a card holding and interlocking mechanism. There have been conventionally proposed card read/write devices of this type. US Patent No. 4,443,049 discloses a connector for portable objects such as credit cards comprising a casing having a card insertion opening, and a locker rotatably mounted so as to slide on a guide path wherein a tip end of the card inserted from the card insertion opening pushes a projection of the locker so that the locker is rotated at ridged lines of a ceiling in the casing whereby the electrodes of the card contact electrode terminals of the locker. Japanese Patent Laid-Open Publication No. 61-16386 discloses a device comprising an elastic member accumulating a discharging force by insertion of the card, a contact member for connecting electrode terminal of the contact member with an electrode of the card or disconnecting the electrode terminal from the electrode of the card while interlocking with the movement of the card, a lock mechanism for locking the card while the electrode of the card contacts the electrode terminals of contact members, a sensor for detecting that the card is inserted to a portion adjacent to a predetermined position of insertion, a holding means for holding the rear end of the inserted card by disengagement of the control level, and a solenoid operated when the sensor detects the card for disengaging the control lever. However, both US Patent and Japanese Patent Laid-Open Publications execute the contact operation between the electrode of the card and the electrode terminal of the contact member by an insertion force of a card or discharge the card by a spring accumulating an energy or resilient force therein to thereby require a greater force for inserting the card which results in an inferior operation. In particular, there is a problem that the card, having electrodes at both surfaces thereof, requires greater force for insertion thereof. Japanese Patent Laid-Open Publication No. 61-16386 discloses a device having a sensor for detecting the insertion of the card at an optimum position, a solenoid for holding the card by actuation thereof. However, according to this device, it takes more time from detection of the card by the sensor, actuation of the solenoid to contact of the electrode terminal with the electrode of the card so that there is a likelihood that the card is not kept in an appropriate position by movement of the card during that period. Hence, there is a problem that there is no assurance of contact between the electrode and the electrode terminal. The present invention seeks to provide a card read/write device enabling lightening of the card to be inserted therein and having a better operability, and which is adapted for use with a card having electrodes on both surfaces thereof. To achieve the above objects, the device of the present invention as defined in claim 1 is arranged in a manner that when a card is inserted from a card insertion opening within a frame, the tip end of the card is pushed to one of the projections of lever members rotatably mounted on the frame so that the other projection of the lever members urges contact members toward the side of the card. If the urging force by the lever members is greater than the resilience force of the spring for urging the contact members so as to move the contact members away from the card, that is, when the card is inserted to the innermost portion of the frame, the contact members rotatably mounted on the frame are rotatable toward the side of the card to thereby permit the electrode terminals to contact the electrodes of the card. In order that the invention may be better understood, an embodiment thereof will now be described by way of example only and with reference to the accompanying drawings in which:- Figure 1 is an exploded perspective view illustrating a card read/write device according to a preferred embodiment of the present invention; Figure 2 is a view for explaining the operation of the card read/write device of Figure 1 in which the card is halfway inserted; and Figure 3 is a view for explaining the operation of the card read/write device of Figure 1 in which the card is completely inserted. A preferred embodiment of a card read/write device will be described with reference to Figures 1 to 3. The card read/write device comprises a frame 10, a disconnection mechanism 20 and a holding and interlocking mechanism 30. The frame comprises a frame 10, a front panel 11 disposed at the front end thereof, a substrate plate 12 having a sensor 34 (described later) disposed at a bottom thereof, and card guides 13, 14 fixed to inner surfaces of side walls of the frame 10. The frame 10 has first shaft receivers 10a projected upwardly from the upper rear surface of the frame 10 and integrated with a groove 10c defined therebetween for receiving a transfer lever 25 (described later), stoppers 10e integrated with first shaft receiver 10a and projected downwardly for receiving the holding and interlocking mechanism 30 and the card, second shaft levers 10b projected upwardly from the upper central surfaces of the frame 10 for receiving a contact lever 21 (described later) and a lock lever 31 (described later), and a substantially rectangular opening 10d positioned between the first and the second shaft receivers 10a, 10b. The front panel 11 has a card insertion opening 11a corresponding to the width and thickness of a card C. The front panel 11 also has a first notched portion at an upper surface thereof located over the card insertion 11a and a second notched portion at the front of the front panel 11 located under the card insertion opening 11a. The first and the second notched portions are respectively constructed to grasp the card C at a state where the card C is inserted into a portion of a predetermined position. The disconnection mechanism 20 comprises contact levers 21, 22, contacts 23, 24 which are respectively extended in the direction of the insertion of the card C and mounted on the contact levers 21, 22, electrodes terminals 23a, 24a respectively mounted on the contacts 23, 24, transfer levers 25, 26 positioned respectively at rear ends of the contact levers 21, 22 for holding the contact levers 21, 22 and a spring 27 provided at a tip end of the contact end 24 and positioned between the transfer levers 25, 26 for urging the contact levers 21, 22 for permitting the contact levers 21, 22 to be moved away from each other. The disconnection member 20 can allow the electrode terminals 23a, 24a of the contacts 23, 24 to be moved away from electrodes C1 of the card C. The contact lever 21 is pivotally fixed to second shaft receivers 10b and rotatable around a rotative fulcrum 100 provided at the second shaft receivers 10b. The contact lever 22 is positioned opposite to the contact lever 21, pivotally fixed to shaft receivers in the frame 10 (not shown), and rotatable around a rotative fulcrum 101 provided at the shaft receivers. The transfer lever 25 has a first projection 25a capable of contacting an upper surface of the contact lever 21, a second projection 25b positioned opposite to the first projection 25a for positioning the transfer lever 25 in an axial direction by being guided by the groove 10c of the frame 10, and a third projection 25c positioned at the central portion of the transfer lever 25. The third projection 25c is positioned at an innermost portion on a card insertion path where the third projection 25c is brought into contact with the tip end C2 of the card C when the card C is inserted. At the portion opposite to the lever 25, there is provided a transfer lever 26 which is rotatably mounted about a rotative fulcrum 103 (not shown). The transfer lever 26 has a first projection 26a which contacts a lower surface of the contact lever 22, a second projection 26b, and a third projection 26c. The second projection 26b, and the third projection 26c, respectively, function in the same manner as the second projection 25b and the third projection 25c of the transfer lever 25. The spring 27 urges the contact lever 21 clockwise (upper direction in Figure 2) and the contact lever 22 counterclockwise (lower direction in Figure 2). Accordingly, in the state where the card C is not inserted into the insertion opening 11a the contact levers 21, 22 are moved away from each other by the resilience force of the spring 27 whereby a sufficient larger clearance is defined between the electrode terminals 23a, 24a. The clearance is greater than the thickness of the card C. In this state, the second projection 25b of the transfer lever 25 is brought into contact with the groove 10c of the frame 10. The arrangement of the second projection 26b of the transfer lever 26 is constructed in the same manner as the second projection 25b of the transfer lever 25. The lock lever 31 of the card holding and interlocking mechanism 30 is supported by the fulcrum 100 in the same manner as the contact 21. The lock lever 31 comprises a first projection 31a having an end bent upwardly for engaging with a rear end of the inserted card C, a second projection 31b extending downwardly from the rotative fulcrum 100 and having a tip end of a U-shaped groove 31f with which a pin 32b of an armature 32a of a plunger magnet 32 constituting an interlocking means, a third projection 31c having a tip end bent in the direction of the contact lever 21 for engaging with an arm (not shown) of the contact lever 21 to move clockwise with the clockwise movement of the contact lever 21, and a fourth projection 31d extending downward at the central portion of the lock lever 31 for functioning another sealed plate by moving into or away from between the light emitting portion and a light receiving portion respectively provided with the sensor 34 while the lock lever 31 is rotated. The armature 32a has a spring 33 coiled there-around which urges the second projection 31b of the lock lever 31 counterclockwise as shown in Figure 2. Accordingly, the spring 33 always urges the lock lever 31 counterclockwise. With the arrangement of the card read/write device according to the present invention, the operation thereof will be described as follows. First, an initial state where the card C is inserted is described with reference to Figure 2. In Figure 2, the card C is inserted halfway which is the same as that where the card C is not inserted into the card read/write device. In this initial state, the contact lever 21 is rotated clockwise by the spring 27 while the contact lever 22 is rotated counterclockwise by the spring 27, whereby there is provided a clearance sufficient for inserting the card C between the contact 23 of the contact lever 21 and the contact 24 of the contact lever 22. The lock lever 31 is positioned in the same manner to be rotated clockwise as the contact lever 21 by engagement of the third projection 31c with the contact lever 21 while the first projection 31a of the lock lever 31 is positioned under the insertion path of the card C. The fourth projection 31d of the lock lever 31 is positioned away from the sensor 34. The transfer lever 25 is rotated counterclockwise by the engagement of the first projection 25a with the contact lever 21 for thereby allowing the second projection 25b to be brought into contact with the bottom of the groove 10c of the frame 10 whereby the third projection 25c is projected toward the card insertion opening. The transfer lever 26 is rotated clockwise by the engagement of the first projection 26a with the contact lever 22 for thereby allowing the second projection 26b to be brought into contact with the bottom of the groove 10c of the frame 10 whereby the third projection 26c is projected toward the card insertion opening. The operation in the state where the card C is inserted from the initial state will now be described. The card C is inserted from the card insertion opening 11a of the front panel 11 and guided along a predetermined path composed of the card guides 13, 14 (not shown in Figure 2). That is, the card C passes over the first projection 31a of the lock lever 31 and inserted between the contacts 23, 24 (in the direction of I in Figure 2). The tip end C2 of the card C is brought into contact with the third projections 25c, 26c of the transfer levers 25, 26 when the card C is pushed into innermost portion adjacent to a predetermined position, whereby the transfer lever 25 is rotated clockwise so that the first projection 25a rotates the contact lever 21 counterclockwise against the resilience force of the spring 27. Simultaneously, the transfer lever 26 is rotated counterclockwise so that the first projection 26a rotates the contact lever 22 clockwise against the resilience force of the spring 27. Accordingly, the electrode terminals 23a, 24a respectively contact the electrodes of the card C. Further insertion of the card C allows the tip end C2 of the card C to come into contact with the stopper 10e of the frame 10 for thereby preventing the card C from moving further. When the card C is positioned with the tip end C2 thereof in contact with the stopper 10e, the rear end C3 of the card C is deviated from the position over the projection 31a of the lock lever 31 while at the same time the lock lever 31 is rotated counterclockwise by the spring 33 to thereby hold the rear end C3 of the card C as shown in Figure 3. The holding state is kept by addition of a force F3 acting upwardly by virtue of the spring 27 to a reaction force F2 acting upwardly by the resilience force of the electrode terminal 23a of the contact 23. That is, the force F3 by the spring 27 and the force F2 by the electrode terminal 23a of the contact 23 gives a discharging force Fb to the card C via the transfer lever 25. The discharging force Fb is resolved by a dividing force f1 connecting the rotative fulcrum 100 of the lock lever 31, the rear end C3 of the card C and the contact point of the first projection 31a of the lock lever 31 and a dividing force f2 perpendicular to the dividing force f1 in which the dividing force f2 becomes the moment for rotating the lock lever 31 counterclockwise whereby the card C is held with safety. As a result, even if the card C is operated so as to be moved away from the frame 10 at this holding state, the dividing force F2 operates in such a manner as to rotate the lock lever 31 in a direction to lock the card so that the card C cannot be extracted from the frame 10, which results in preventing the card C from being extracted during the time when data is being read from or written to the card C. The arrangement of the card read/write device according to the present invention may be modified as follows. Define a clearance having a small distance between the rear end C3 of the card C and the first projection 31a of the lock lever 31. In this modification, the card C is slightly retracted by the discharging force Fb caused by the spring 27 when the card C is pushed in until it is brought into contact with the stopper 10e of the frame 10 and the card C is freed from the hand of an operator. With the retracting movement of the card C, the electrodes of the card C and the electrode terminals of the card read/write device are moved laterally relative to one another while they contact each other so that both the electrode and electrode terminals are slidably frictioned whereby a self-cleaning operation is generated to make both the electrode and electrode terminals contact in better condition. In this state, the lock lever 31 is moved counterclockwise until it is brought into contact with the limiter 35 provided at the frame 10 whereby the shield plate 31d as the fourth projection is moved to a detecting position of the sensor 34 to switch the sensor 34. As a result, the read/write operation is started. When the read/write operation of the card C is completed, and a signal to extract the card C by the operator from the keyboard is applied to the card read/write device, the plunger magnet 32 is energised to attract the armature 32a from the right to the left (Figure 2) for thereby attracting the second projection 31b of the lock lever 31 connected to the pin 32b and rotating the lock lever 31 clockwise. At this time, the tip end of the first projection 31a of the lock lever 31 is disengaged from the rear end C3 of the card C so that the card C is discharged by the discharging force Fb of the spring 27 in a direction from left to right in Figure 3. In the case where the card C must be retracted manually after setting the card C, the lock lever 31 may be rotated clockwise by lowering the tip end of the first projection 31a of the lock lever 31 from the card insertion opening 11a of the front panel 11. However there is provided a lock mechanism for preventing the card C from being extracted from the card read/write device by an erroneous operation. With the arrangement of the preferred embodiment, provided that the distance from the first projection 25a to the operating point of the rotative fulcrum 102 of the third projection 25c is the same, the force F1 for urging the contact lever 21 downward by the first projection 25a and the force Fa required for insertion of the card C become the same (Fa=F1). There generated an expression F1 x L1 = F3 x L3 + F2 x L2 where L1 is the distance from the rotative fulcrum of the contact lever 21 to the operation point of the force F1 for urging the contact lever 21 toward the card C side by the transfer lever 25, L2 is the distance from the rotative fulcrum of the contact lever 21 to the operation point of a resultant force F2 for receiving the force from the card C by the electrode terminal 23a, and L3 is the distance from the rotative fulcrum of the contact lever 21 to the operating point of the force F3 caused by the spring 27. Since Fa = F1 the expression (1) may be expressed as (F3 x L3 + F2 x L2) / L1 where F3 x L3 functions merely to reset the contact lever and is very small compared with F2 x L2. Accordingly, if the relation of L1>L2 is assured, the insertion force Fa is very small to thereby facilitate the insertion of the card with ease. Inasmuch as the arrangement of the preferred embodiment employs an automatic lock mechanism without employment of electric means such as a solenoid, there is no time relay required for attracting operation by the solenoid and the discharging force of the card C can act in a direction such as to hold the lock lever 31 by selecting the fulcrum position of the lock lever 31. Hence, it is possible not only to position the card C correctly but also to prevent in advance the card C from being discharged accidentally which is liable to occur during the read/write operation by automatic locking operation of the card C and the lock lever 31 (the discharging force acting in a direction to lock the card).

Claims: 1. A card read/write device comprising: a frame (10); and a disconnection mechanism (20) mounted on said frame (10), said disconnection mechanism (20) comprising: contact members (23, 24) mounted on contact of levers (21, 22) rotatably mounted on said frame (10), said contact members (23, 24) being opposed to each other and respectively having electrode terminals (23a, 24a) capable of contacting electrodes (C1) mounted on a card; transfer levers (25, 26) respectively rotatably mounted on said frame (10) and having respectively at least two projections (25a, 25c; 26a, 26c), one of said projections (25a, 26a) on each transfer lever (25, 26) being operable to urge a respective one of said contact members (23, 24) toward the side of the card (C) for allowing the electrode terminals (23a, 24a) of said contact members (23, 24) to contact said electrodes (C1) of the card (C) when a tip end (C2) of the card (C) inserted into the frame (10) is pushed to the other projection (25c, 25c); and a first spring (27) positioned at the free ends of said contact levers (21, 22) and between said transfer levers (25, 26) for urging said contact members (23, 24) in a direction such as to move away from the card (C). 2. A card read/write device according to claim 1, additionally comprising: a card holding and interlocking mechanism (30) mounted on said frame (10) to a predetermined position, comprising, a lock lever (31) rotatably mounted on said frame (10) for holding the card (C) when the card (C) is inserted into said frame (10); and an interlocking member interlocked with said disconnection mechanism (20) for actuating said lock lever (31). 3. A card read/write device according to claim 2, wherein said interlocking member comprises: a second spring (33) for rotating said lock lever (31) in a direction such as to hold the card (C); and a solenoid having said second spring (33) for rotating said lock lever (31) in a direction opposite to the direction to hold the card (C). 4. A card read/write device according to claim 2, wherein said interlocking member has a mechanism for generating a movement for rotating said lock lever (31) in a direction opposite to the direction to hold the card (C) by a force generated by said first spring (27) for discharging the card (C). 5. A card read/write device according to any one of claims 2, 3 or 4, wherein said contact members (23, 24) and said levers (31) are rotated around the same shaft receivers (10b) mounted on said frame (10). 6. A card read/write device according to either one of claims 2 or 3, wherein the following expression is established: L1>L2 where L1 is the distance from the rotative fulcrum of said contact levers (21, 22) to the operation point of the force for urging said contact levers (21, 22) toward the card (C) side by said transfer lever (25, 26), and L2 is the distance from the rotative fulcrum of said contact levers (21, 22) to the operating point of a resultant force for receiving the force from the card (C) by said electrode terminals (23a, 24a).

Inventors: KONISHI, HIROSHI OKI ELECTRIC INDUSTRY CO.,LTD., SHIMIZU, MAKOTO OKI ELECTRIC INDUSTRY CO.,LTD.
Applicants: OKI ELECTRIC INDUSTRY COMPANY, LIMITED
Application year: 1989
Main classification: G06K7
IPC codes: G06K13, G06K17, G06K7