JPH0626994B2 - Card carrier - Google Patents

Description

The present invention relates to a card carrier suitable for application to a card reader such as a card type vending machine, and more particularly to a linear ultrasonic motor as a drive source thereof. The present invention relates to a novel card carrier.

[Conventional technology]

Conventionally, a card reader incorporated in a card type vending machine or the like takes in a magnetic card inserted from a card insertion slot, processes it, and returns it from the card return slot after the service ends. Generally, it is composed of a drive motor and a conveyance means such as a roller or a conveyance belt which operates by receiving the rotation transmission of the drive motor to move the magnetic card.

[Problems to be Solved by the Invention]

However, such a conventional card transfer device includes a drive motor, a transfer means, a bearing member for axially supporting the transfer means, a gear for transmitting the rotation of the drive motor to the transfer means, a rotation transmission mechanism such as a pulley, and the like. Since it is necessary, the number of parts and the number of assembling steps are large and the cost is high.In addition, when a gear is used, high precision feed and positioning cannot be performed due to backlash, and the size of the motor, roller, etc. is restricted. There was a limit to how light and thin the device could be.

Therefore, the present invention solves the conventional problems as described above, and by using the linear ultrasonic motor as the drive means, the number of parts and the number of assembling steps are significantly reduced,
It is an object of the present invention to provide a card carrying device that enables an ultra-light and thin structure.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a card carrier for holding a card, a guide for guiding and holding the card carrier, and a part of the outer peripheral surface on a motion transmission surface provided on the lower surface of the card carrier. A ring-shaped piezoelectric element arranged below the card carrier so as to come into contact therewith, and a drive signal is supplied to the piezoelectric element to provide primary vibration in the radial direction and non-axisymmetric in-plane vibration. Is configured to give.

[Action]

In the present invention, when an AC voltage having a phase difference of φ = 90 ° is applied to the piezoelectric element, the piezoelectric element causes multi-mode vibration of radial primary vibration and non-axisymmetric in-plane vibration, and two mass points on the outer peripheral surface thereof. Generates an elliptical motion in which the direction of rotation is opposite. Therefore, when this mass point and the motion transmitting surface of the card carrier are brought into contact with each other, the mutual frictional forces cause the card carrier to move in the same direction as the rotation direction of the elliptic motion at the time of contact, and the voltage phase difference φ = −. When the angle is set to 90 °, the strain direction of the piezoelectric element is also reversed and the rotation direction of the elliptical motion at the time of contact becomes the opposite direction, and the card carrier is fed backward.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a plan view showing an embodiment of a card carrier according to the present invention, FIG. 2 is a sectional view, and FIGS. 3 (a) and 3 (b) are views showing vibration of a piezoelectric element. In these figures, 1 is a magnetic card such as a telephone card, 2 is a plate-shaped card carrier for holding the magnetic card 1, and a card storage groove 3 for housing the magnetic card 1 is provided on the upper surface of the card carrier 2. A pair of left and right ridges 5A and 5B, which are formed over the entire length in the longitudinal direction and whose opposing surfaces form the motion transmitting surfaces 4a and 4b, are provided at both ends in the longitudinal direction of the card carrier table 2, that is, the card carrier direction (direction A). It is installed at an appropriate interval so as to extend up to. Reference numeral 6 denotes a base, on which a pair of left and right guides 7A and 7B that extend long along the card transport direction (direction A) are provided as a pair, and the inner surfaces of the upper ends of the guides 7A and 7B are opposed to each other. Guide grooves 8A, 8B for slidably guiding and holding both end portions 2a, 2b of the card carrier 2 are formed in the guide 2, and both guides are formed on the surface of the base 6.
Between the 7A and 7B, a piezoelectric element 9 formed of a ring-shaped PZT or the like that constitutes the driving means of the card carrier 2 is a holding member having a flexibility such as felt or sponge as a stator of a linear ultrasonic motor. It is arranged through 10. The piezoelectric element 9 is inserted into the piezoelectric element storage groove 11 formed between the pair of left and right ridges 5A and 5B on the lower surface of the card carrier 2 and has two mass points P ₁ at symmetrical positions on the outer peripheral surface. , P ₂ are in line contact with the motion transmitting surfaces 4a, 4b of the ridges 5A, 5B, respectively, and are separated from the lower surface of the card carrier 2. The surface of the piezoelectric element 9 has two regions B _1, B ₂ by being divided into two circumferentially these regions B _1,
B ₂ is a fan shape having an opening angle of 180 °, in other words, a circular shape, the linear portions of the areas B ₁ and B ₂ are orthogonal to the card conveying direction A, and both ends thereof are the motion transmitting surfaces 4 a and 4 b. The mass points P ₁ and P ₂ contacting each other are defined.

In the card carrier having such a structure, the lower surface of the piezoelectric element 9 is grounded, and the areas B ₁ and B ₂ are 30 KHz to 40 KHz.
When the alternating voltages sin ωt and cos ωt are applied respectively, when the inner diameter / outer diameter of the piezoelectric element 9 is a certain value (0.27), the piezoelectric element 9
At the same time, the primary vibration in the radial direction (R, 1) and the non-axisymmetric in-plane vibration ((1, 1)) are simultaneously generated. The primary vibration (R, 1) in the radial direction is indicated by arrows D ₁ and D ₂ in FIG. 3 (a), and when extending in the direction of arrow D ₁ , the mass points P ₁ and P
₂ is the motion transfer surface 4a, in contact with 4b, when contracted in an arrow D ₂ direction, the mass point P _1, P ₂ is spaced apart said motion transmission surface 4a, from 4b. Non-axisymmetric in-plane vibration ((1,1)) is a standing wave that expands and contracts in the same direction as the card transport direction A and in the opposite direction as indicated by arrows E ₁ and E ₂ in FIG. Direction E ₁ is D
_{At 1} , E ₂ is in tune with D ₂ . When these standing waves interfere with each other and are combined, a multimode vibration with different amplitudes is generated at each point on the outer peripheral surface, and the frictional force due to the contact between the piezoelectric element 9 and the card carrier 2 due to this vibration is generated by the card. The transfer force of the transfer table 2 is converted.

That is, the motion transfer surface 4a of the mass points of the outer peripheral surface of the piezoelectric element 9, when focusing on two mass points P _1, P ₂ in contact with 4b, these mass points P _1, P _2, the piezoelectric element 9 itself An elliptic motion F ₁ (see FIG. 4) that rotates in the same direction as the vibration direction E ₁ of the mass points P ₁ and P _{2 is} caused by the multimode vibration.
As described above, when the piezoelectric element 9 extends in the arrow D ₁ direction, the two mass points P ₁ and P ₂ that perform the elliptic motion F _{1 contact the} motion transmitting surfaces 4a and 4b and contract in the arrow D ₂ direction. At this time, since it is separated from the motion transmitting surfaces 4a, 4b, the card carrier 2 is moved to the mass point P ₁ ,
When a small amount is moved in the rotation direction (direction A in FIG. 4) of the elliptic motion F ₁ of P ₂ and contracts in the D ₂ direction over time, the mass points P ₁ and P ₂ are separated from the motion transmitting surfaces 4a and 4b. Therefore, the card carrier 2 cannot be moved, and by repeating such an operation, the card carrier 2 can be moved in a constant direction at a constant speed. As a result, the magnetic card 1 is guided together with the card carrier 2 by the guides 7A, 7B.
Will move to a desired position along the
When the phase difference of the voltage with respect to is inverted, the periods of the radial primary vibration and the non-axisymmetric in-plane vibration are in the opposite directions to the above, so the mass points P ₁ and P ₂ make an elliptic motion in the F ₂ direction in FIG. At this time, the mass points P ₁ and P ₂ come into contact with the motion transmitting surfaces 4a and 4b,
The card carrier 2 is moved in the direction opposite to the arrow A direction so that the card carrier 2 can reciprocate.

〔The invention's effect〕

As described above, the card transport device according to the present invention uses a ring-shaped piezoelectric element as a drive source, and multiplexes by combining primary vibration in the radial direction of this piezoelectric element and non-axisymmetric in-plane vibration. Modal vibration is generated, and two mass points on the outer peripheral surface perform an elliptical motion accordingly, and the frictional force between the mass point and the card carrier causes the card carrier to move along the guide. As a result, there is no need for transporting means such as drive motors, rollers or transport belts, which have been indispensable in the past, and it is possible to reduce the number of parts and to make them significantly lighter and thinner. The card reader can be moved and positioned with high accuracy, and a lightweight and thin card reader can be realized.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a card carrier according to the present invention, FIG. 2 is a sectional view, FIGS. 3 (a) and 3 (b) are views showing vibration of a piezoelectric element, and FIG. (a), (b) It is a figure for demonstrating the drive principle of this invention. 1 ... Magnetic card, 2 ... Card carrier, 4a, 4b ... Motion transmission surface, 7A, 7B ... Guide, 9 ... Piezoelectric element, P ₁ ,
P ₂ ...... mass point.

Claims (1)

[Claims] 1. A card carrier for holding a card, a guide for guiding and holding the card carrier, and a card so that a part of an outer peripheral surface of the card carrier comes into contact with a motion transmitting surface provided on a lower surface of the card carrier. A ring-shaped piezoelectric element disposed below the carrier is provided, and a driving signal is supplied to the piezoelectric element to provide primary vibration in the radial direction and multimode vibration of non-axisymmetric in-plane vibration, thereby providing an outer circumference. A card conveying device, wherein an elliptical movement of which the rotational direction is the same as the card moving direction is generated at a mass point of the surface which comes into contact with the motion transmitting surface.