JPH02276740A - Transport device - Google Patents

Abstract

PURPOSE:To reduce the number of parts and greatly reduce the weight and thickness by shifting a transport board in the revolution direction of an elliptical movement by constituting the title device so that each longitudinal vibration is generated on the first and second vibrating plates by a piezoelectric element. CONSTITUTION:When the high frequency voltage is applied onto the first piezoelectric element 12A, a longitudinal vibration in the longitudinal direction is generated on the first vibrating plate 11A, and when the high frequency voltage is applied onto the second piezoelectric element 12B, a longitudinal vibration is generated similarly on the second vibrating plate 11B. When the phase difference of the high frequency voltage applied onto the first and second piezoelectric elements 12A and 12B is set 90 deg., the vibration of the first and second vibrating plates interfere each other, and composed to generate a multimode vibration, and an elliptical movement is generated by an arbitrary mass point on the edge surface contacting the motion transmission surface of the transport board 2 of the second vibrating plate 11B. When the second vibrating plate vibrates in the longitudinal direction and the edge surface contacts and separates from the motion transmission surface of the transport board, the transport plate 2 is shifted in the turning direction of the elliptical movement by the frictional force in contact.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a conveyance device suitable for application to a card reader of a card-type vending machine, etc., and particularly to a conveyance device suitable for application to a card reader of a card-type vending machine, and particularly to a conveyance device that can be used as a drive source in place of a conventional drive motor. , relates to a novel conveyance device using a linear ultrasonic motor.

[Conventional technology] Conventionally, a card league built into a card-type vending machine takes in a magnetic card (mobile object) inserted through a card insertion slot, processes it, and returns it through a card return slot after the service is completed. The card transport device generally consists of a drive motor and transport means such as rollers and transport belts that operate in response to the rotation of the drive motor and move the magnetic card at a constant speed. .

[Problems to be Solved by the Invention] However, such conventional card conveyance devices require many accessory parts such as bearing members, gears, belts, and pulleys in addition to the drive motor and conveyance means. This increases the number of parts and assembly man-hours, making it expensive. If gears are used, backlash prevents high-precision feeding and positioning, and the equipment is limited by the size of the drive motor, rollers, etc. There was a limit to how lightweight and thin the product could be.

Therefore, the present invention has been made in view of the conventional problems as described above, and its purpose is to significantly reduce the number of parts and assembly man-hours by using ultrasonic vibration as a drive energy source. Another object of the present invention is to provide a conveying device that is lightweight and thin.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a conveyance table that holds a movable body, a guide that guides and holds the conveyance table, and a guide that contacts a motion transmission surface of the conveyance table. includes a vibrating body disposed below the conveyance table, a piezoelectric element attached to the vibrating body, and a high-frequency power source that applies a high-frequency voltage to the piezoelectric element, and the vibrating body extends in the conveyance direction. A first diaphragm located in the diaphragm and a pair of front and rear second diaphragms extending in a direction perpendicular to the conveying direction form an H-shape in plan view, and each end surface of the second diaphragm contacts the motion transmission surface. The piezoelectric element generates longitudinal vibration in the longitudinal direction of the first diaphragm.
It is composed of a piezoelectric element and a second piezoelectric element that generates longitudinal vibration in the longitudinal direction of the second diaphragm, and the phase of the high frequency voltage applied to these first and second piezoelectric elements is adjusted to 90°.
``It is different.

Further, in order to achieve the above object, the present invention includes a conveyance table that holds a moving body, a guide that guides and holds this conveyance table,
A vibrating body disposed below the conveying table so as to be in contact with a motion transmission surface of the conveying table, a piezoelectric element attached to the vibrating body, and a high-frequency power source applying a high-frequency voltage to the piezoelectric element. The vibrating body is formed into a rectangular frame shape in plan view, including a pair of left and right first diaphragms extending in the conveyance direction and a pair of front and rear second diaphragms extending in a direction perpendicular to the conveyance direction. 5. Each end surface of at least the second fi moving plate contacts the motion transmission surface, and the piezoelectric element includes a first piezoelectric element that generates longitudinal vibration in the longitudinal direction of the first vibration plate, and a first piezoelectric element that generates longitudinal vibration in the longitudinal direction of the first vibration plate; and a second piezoelectric element that generates longitudinal vibration in the longitudinal direction, and the phases of the high-frequency voltages applied to the first and second piezoelectric elements are made to differ by 90 degrees.

In the present invention, when a high-frequency voltage is applied to the first piezoelectric element, longitudinal vibration occurs in the first diaphragm in its longitudinal direction, and when a high-frequency voltage is applied to the second piezoelectric element, the second diaphragm also generates longitudinal vibration. Longitudinal vibration occurs in the longitudinal direction.If the phase difference between the high-frequency voltages applied to the first and second piezoelectric elements is set to Φ-90°, the vibrations of the first and second diaphragms interfere with each other and are combined, resulting in multiple modes. Since the vibration is caused, an elliptical motion is generated at an arbitrary mass point on the end surface of the second diaphragm that contacts the motion transmission surface of the transport platform.The second diaphragm vibrates in its longitudinal direction, causing the end surface to move When it comes into contact with and separates from the motion transmission surface, the frictional force at the time of contact causes the conveyance table to move in the rotational direction of the elliptical motion.

Then, when the phase difference of the applied voltages is set to Φ=-90°, the rotational direction of the elliptical motion is reversed, so the conveyance table is moved in the opposite direction. In the vibrating body having a rectangular frame shape in plan view, the outer surface of the first diaphragm can also be brought into contact with the movement guide surface of the conveyance table, and a larger driving force is generated compared to the vibrating body having an H shape in plan view.

[Example] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a plan view showing an embodiment of a conveying device according to the present invention, FIG. 2 is a sectional view, and FIG. 3 is a plan view of a vibrating body. In these figures, 1 is a magnetic card (moving object) such as a telephone card, 2 is a plate-shaped carrier that holds the magnetic card 1, and the upper surface of this carrier 2 has a card storage groove that accommodates the magnetic card 1. 3 is formed over the entire length in the longitudinal direction, that is, in the conveyance direction (direction of arrow A), and on the lower surface, a pair of left and right protrusions 5A whose opposing inner surfaces constitute motion transmission surfaces 4a and 4b are formed.
, 5B are formed over the entire length in the longitudinal direction.

6 is a base, and on this base 6, a pair of left and right guides 7A and 7B extending long along the conveyance direction are provided oppositely.
Guide grooves 8A and 8B are formed on the inner surfaces of the upper ends of these guides 7A and 7B, which are opposed to each other, to guide and hold the opposite ends 2a and 2b of the carrier 2 in a slidable manner. A driving means 9 for the conveyance table 2 is disposed on the surface between the guides 7A and 7B via a holding member 10.

The driving means 9 forms a linear ultrasonic motor, and is composed of a vibrating body 11 and a piezoelectric element 12 made of PZT or the like bonded to the surface of the vibrating body 11.

The vibrating body 11 is formed into an H-shape in a plan view, and has a plate-shaped first moving plate 11A that extends long in the conveyance direction, and a central portion that extends in a direction perpendicular to the conveyance direction. 1
A plate-shaped second diaphragm 11B (lla, 1llb) is connected to both ends of the diaphragm 11A, and both end surfaces 1 of each of the second diaphragms 111a and 111b are connected to both ends of the diaphragm 11A.
3 are in contact with the motion transmission surfaces 4a and 4b of the conveyance table 2, respectively. Note that the first diaphragm 11A and the second diaphragm 11
The natural frequencies of B are equal.

The holding member 10 is positioned at a position that becomes a node during the first tIIi movement of the 111ii movement plate 11A.

The piezoelectric element 12 includes a first piezoelectric element 12A that generates a first-order (Ll) longitudinal vibration S1 in the longitudinal direction of the first diaphragm 11A, that is, in the transport direction, and each second diaphragm 111.
Second piezoelectric elements 12B (112a, 112b) that generate first-order (LL) longitudinal vibration S2 in the longitudinal direction of a and 111b, that is, in the direction orthogonal to the conveyance direction.
It is made up of. The first and second piezoelectric elements 12A and 12B are connected to the first and second high frequency power sources 14.1.
5 (15a, 15b), respectively.

In this case, a high frequency voltage (sin ωt, c) is applied to the first and second piezoelectric elements 12A, 12B by the first and second high frequency power supplies 14.15.

Sωt) have a temporal phase difference Φ of 90° from each other. Further, the high frequency voltages (+cosωt, -CO5ωt) applied to each of the second piezoelectric elements 112a and 112b have a phase difference Φ of 180° from each other.

In the conveyance device having such a configuration, the first piezoelectric element 12A and the second piezoelectric elements 112a, 112b have a first
, 3, which matches the natural frequency of the second diaphragm 11A, IIB.
High frequency voltage sinωt, +co from 0KHz to 40KHz
These are driven in two phases by respectively applying sωt+−cosωt. Then, the first piezoelectric element 12A expands or contracts in the conveying direction (arrow A direction) in its surface direction, and the first piezoelectric element 12A
A primary longitudinal vibration is generated in the longitudinal direction of the diaphragm 11A. On the other hand, the second piezoelectric elements 112a and 112b extend and contract, respectively, in a direction perpendicular to the conveying direction in their plane directions, and generate primary longitudinal vibration in the longitudinal direction of the second diaphragms 111a and 111b. However, the applied voltage (+co
Since the phase difference Φ of sωt, -cosωt) differs by 180°, the expansion and contraction modes of the second diaphragm 111a and the second diaphragm 111b are opposite. That is, the second diaphragm 111a
The vibration S1 of the first vibration plate 11A and the vibration S2 of the second vibration plates 111a and 111b are both standing waves, and the vibration direction is When they are in the direction of the arrow in FIG. 3, it is assumed that they are in sync with each other. When these standing waves interfere with each other and are combined, multi-mode vibration occurs, and the contact between the vibrating body 11 and the carrier 2 due to this vibration causes rg! The frictional force is converted into a conveying force of the conveying table 2.

That is, among the mass points on the side end surface of the vibrating body 11, the transport platform 2
each second diaphragm 111 in contact with the motion transmission surfaces 4a, 4b of
Focusing on the mass points P1 and P2 on each end face 13 of the vibrating body 11 itself, these mass points P1 and P2 exhibit an elliptical motion 20 (transverse amplitude U, vertical amplitude W), and the vibration velocity at the apex is expressed as v=2πfu (f is the frequency of vibration). The two mass points P1 and P2 that perform such an elliptical motion 20 come into contact with the motion transmission surfaces 4a and 4b when the second diaphragms 111a and 111b extend, and separate from the motion transmission surfaces 4a and 4b when they contract. Therefore, due to the frictional force between them when they come into contact, the conveyor table 2 is moved in an elliptical motion 20.
, and each second
Due to the contraction of the diaphragms 111a and 111b, the mass points P1 and P
2 is separated from the motion transmission surfaces 4a and 4b, the conveyance table 2 cannot be moved, and by repeating such an operation, the conveyance table 2 can be moved at a constant speed in the conveyance direction. . As a result, the magnetic card 1 is moved together with the carrier 2 to a desired position along the guides 7A and 7B.

Next, when the phase difference Φ of the voltages applied to the first and second piezoelectric elements 12A and 12B is reversed (Φ=-90°), the first diaphragm 1.1A and the second diaphragm 11B (111a, 1llb
) is opposite to the above, so the mass points P1 and P2
The rotational direction of the elliptical motion 20 is in the opposite direction, and the transport platform 2
is moved in the opposite direction to the transport direction, thereby making it possible to reciprocate the transport platform 2.

FIG. 4 is a plan view of a vibrating body showing another embodiment of the present invention. In this embodiment, the vibrating body 11 is formed into a rectangular frame shape with equal lengths on four sides, so that a pair of left and right first vibrating plates 30 (30a, 30b) parallel to the conveying direction and a pair of first vibrating plates 30 (30a, 30b) perpendicular to the conveying direction are formed. It is composed of a pair of front and rear second diaphragms 31 (31a, 31b) that face each other in parallel in the direction.

A first piezoelectric element 12A is attached to each of the first diaphragms 30a, 30b, and the first piezoelectric element 12A is a node at the time of first-order longitudinal vibration in the longitudinal direction of each of the first diaphragms 30a, 30b. It is located in the department. The other configurations are substantially the same as those of the above embodiment.

In such a configuration, high frequency voltages s inωt,
When +cosωt+-cosωt is applied, the first diaphragm 30 and the second diaphragm 31 cause first-order longitudinal vibrations S1 and S2 in their longitudinal directions, and these vibrations interfere with each other and are combined to cause multimode vibration. As in the above embodiment, arbitrary mass points on each end surface of the second diaphragm 31 perform elliptical motion, so that the conveyance table can be moved in the conveyance direction. Note that for the application of -cosωt, the piezoelectric element can also be used as a +cosωt power source by turning it upside down and bonding it.

FIG. 5 is a plan view of a vibrating body showing another embodiment of the present invention. This embodiment is a modification of the above embodiment, in which the vibrating body 1
1 has a rectangular frame shape that is long in the transport direction, and a first piezoelectric element 12A is attached to each of a pair of first diaphragms 30 (30a, 30b) extending in the same direction, and a secondary (L)
2) is designed to generate longitudinal vibration. 1st
The natural frequencies of the diaphragm 30 and the second diaphragm 31 are equal.

In such a configuration, the length of the first diaphragm 30 increases the conveyance distance. In addition, in the elliptical motions shown in P1 and P2 in Fig. 4, the period is shifted by half a period, so smooth conveyance can be expected. You can get

In the present invention, an example has been shown in which low-order longitudinal vibration is generated in the longitudinal direction of the first and second diaphragms of the vibrating body 11, but the present invention is not limited to this.
It can be changed freely, such as next, third, etc. Further, by arranging a plurality of piezoelectric elements up to the number of nodes corresponding to the order at that time, the driving force can be increased.

[Effects of the Invention] As explained above, the conveying device according to the present invention uses a vibrating body provided with a piezoelectric element as a driving source, and connects this vibrating body to a first vibrating plate extending in the conveying direction and perpendicular to the conveying direction. The second WR motion plate is formed into an H-shape or a rectangular frame shape with a second vibration plate extending in the direction of Since the diaphragm is configured to generate longitudinal vibration in its longitudinal direction,
Due to the interference synthesis of both of these vibrations, the mass point on the end surface of the second diaphragm moves in an elliptical motion, and the friction force between the mass point and the motion transmission surface of the conveyance table due to this elliptical motion moves the conveyance table in the rotational direction of the elliptical motion. Therefore, there is no need for conveyance means such as drive motors, rollers, and conveyor belts, which were previously considered indispensable.This reduces the number of parts and makes it possible to significantly reduce weight and thickness, and also eliminates backlash caused by gears. Therefore, movable objects such as magnetic cards, printer paper feed, price tags, etc. can be moved and positioned with high precision, and the device can be made lighter and thinner. Further, in the case of a rectangular frame type vibrating body, the contact area with the vibration transmission surface can be made larger than that of the H type vibrating body, so that a large driving force can be obtained.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the conveying device according to the present invention, FIG. 2 is a sectional view, FIG. 3 is a plan view of a vibrating body, and FIG. 4 is a vibration showing another embodiment of the present invention. FIG. 5 is a plan view of a vibrating body showing still another embodiment of the present invention. ■... Magnetic card, 2... Transport platform, 4a, 4b...
- Motion transmission surface, 7A, 7B... Guide, 9... Drive means, 11... Vibrating body, 11 people... First diaphragm, 1
1B...Second diaphragm, 12...Piezoelectric element, 12A.
...first piezoelectric element, 12B...second piezoelectric element, 14
．． 15...High frequency power supply, Pl, P2... Mass point. Patent applicant Tamura Electric Manufacturing Co., Ltd. Agent
Procedural amendment by Masaki Yamakawa (voluntary) Details of the amendment Figure 5 will be amended as shown in the attached sheet.

Claims (2)

[Claims] (1) A conveyance table that holds a moving body, a guide that guides and holds the conveyance table, a vibrating body disposed below the conveyance table so as to be in contact with a motion transmission surface of the conveyance table, and a vibrating body that vibrates the conveyance table. The vibrating body includes a piezoelectric element attached to the body and a high-frequency power source that applies a high-frequency voltage to the piezoelectric element, and the vibrating body includes a first vibration plate extending in the conveying direction and a first vibrating plate extending in a direction perpendicular to the conveying direction. A pair of front and rear second diaphragms are formed into an H-shape in plan view, each end surface of the second diaphragm contacts the motion transmission surface, and the piezoelectric element is attached to the first diaphragm in the longitudinal direction. a first piezoelectric element that generates longitudinal vibration; and a second piezoelectric element that causes the second diaphragm to generate longitudinal vibration in its longitudinal direction; and a high-frequency voltage that is applied to the first and second piezoelectric elements. A conveyance device characterized in that the phases of the two are different by 90 degrees. (2) A conveyance table that holds a moving object, a guide that guides and holds the conveyance table, a vibrating body disposed below the conveyance table so as to contact a motion transmission surface of the conveyance table, and a vibrating body that vibrates the conveyance table. The vibrating body includes a piezoelectric element attached to the body and a high-frequency power source that applies a high-frequency voltage to the piezoelectric element, and the vibrating body includes a pair of left and right first diaphragms extending in the conveying direction, and a pair of first vibrating plates extending in a direction perpendicular to the conveying direction. The piezoelectric element is formed into a rectangular frame shape in plan view with a pair of front and rear second diaphragms extending from each other, each end surface of at least the second diaphragm is in contact with the motion transmission surface, and the piezoelectric element is connected to the first diaphragm. a first piezoelectric element that generates longitudinal vibration in the longitudinal direction of the second diaphragm; and a second piezoelectric element that generates longitudinal vibration of the second diaphragm in the longitudinal direction; A conveying device characterized in that the phases of applied high frequency voltages are different by 90 degrees.