JPH0656024U - Piezoelectric drive type transport device - Google Patents

Abstract

(57) [Abstract] [Objective] In a piezoelectric drive type transfer device, the interval between the base and the transfer member is narrowed to improve the stability of the transfer device, and the vibration amplitude of the transfer member is increased to increase the transfer speed. thing. A piezoelectric device in which a connecting portion between an elastic plate of a vibrating body and a connecting member is bent to make the elastic plate of the vibrating body and the connecting member non-linear and arranged between a base and a carrier. Driven transfer device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piezoelectric drive type transfer device using a piezoelectric element as a vibration source of a transfer body for transferring relatively small parts such as electric parts or mechanical parts as a transfer object by vibration.

[0002]

[Prior art]

 A conventional piezoelectric drive type transfer device using a piezoelectric element as a vibration source has been already publicly known in Japanese Utility Model Publication No. 52-61087 or Japanese Utility Model Publication No. 57-46517, and its structural principle will be described with reference to FIG. It looks like this:

That is, a configuration in which a plurality of so-called bimorphs 4 in which the piezoelectric elements 2 are attached to both surfaces of the drive plate 3 are used, a configuration in which one end of the bimorphs 4 is inclined and erected on the base 7, and the bimorph 4 is described above. The other end is connected to the carrier 6 in a straight line via the connecting member 5, and an AC voltage is applied to each piezoelectric element 2 in the piezoelectric drive type carrier device 1 having such a structure.

By applying the AC voltage, the piezoelectric element 2 expands in a positive half cycle and contracts in a negative half cycle. Therefore, in the bimorph 4 to which the piezoelectric element 2 is attached, each piezoelectric element 2 If the applied voltage is shifted by half cycles, the expansion-contraction motion is converted into a flexion motion by the cantilever type bimorph structure, and vibration in the direction of arrow 9 with the lower end of the drive plate 3 and the base as a fulcrum is a fulcrum. Therefore, the carrier 6 is vibrated.

[0005]

[Problems to be solved by the device]

 In the conventional piezoelectric drive type transfer device 1, the bimorph 74 and the connecting member 5 are arranged in a straight line between the base 7 and the transfer body 6 so that the base 7 and the transfer body 6 are inclined. There is no choice but to widen the distance between them and, therefore, there is a problem in terms of stability and size of the piezoelectric drive type transport device 1.

In particular, when the article 8 placed on the carrier 6 is not lightweight and the article 6 is fully loaded on the carrier 6, the center of gravity of the piezoelectric drive type carrier device 1 becomes high, which causes the above-mentioned problems. Was further enhanced.

As another problem, since the elastic plate 3 and the connecting member 5 are erected in a straight line, the displacement of the connecting point between the connecting member 5 and the carrier 6 cannot be made sufficiently large. Therefore, it is difficult to sufficiently increase the conveying speed of the conveyed product 8 which is proportional to the displacement.

The present invention provides a novel piezoelectric drive type transport device that solves the above problems.

[0009]

[Means for Solving the Problems]

 The means will be described below with reference to FIG. According to the present invention, the drive plate 13 and the connecting member 15 are not inclined and erected in a straight line in order to solve the above problem, but the connecting point P of both is bent and made non-linear to be conveyed with the base 17. It is arranged between the body 16. The reason why such a configuration is adopted will be described below with reference to FIG.

Now, a mass point p ₁ of mass m ₁ and a rod of length l ₁ are hung from a fixed point o, and a mass point p ₂ of mass m ₂ and a rod of length l ₂ are hung from p ₁ to make mass. Consider the motion when p ₁ and p ₂ are oscillated in the same vertical plane.

[0011] movement relative _p 1, _{p 2} tension bar _p 1, _{p 2} acting tension rod op ₁ on the coordinates _{p 1} taken as shown in Figure 3 to _s 1, _{p 1} and _{p 2} as _{s 2} equation, ^{_{i.e., m 1 d 2 x 1 /}} dt 2 = -s 1 sinθ + s 2 sinψ, m 1 d 2 y 1 / dt 2 = -s 1 cosθ + s 2 cosψ + m 1 g, m 2 d 2 x 2 / dt 2 = When −s ₂ sin ψ, m ₂ d ² y ₂ / dx ² = −s ₂ cos ψ + m ₂ g is set and θ and ψ are analyzed as the number of times t, the vibration pattern of the two bars is shown in FIG. There are four patterns as shown in. Among them, the reference vibration is φ> 0 when θ> 0, and φ <0 when θ <0, and the vibration patterns shown in FIGS. 4A and 4B correspond to this. In the non-standard vibration, ψ <0 when θ> 0, ψ> 0 when θ <0, and the vibration patterns shown in FIGS. 4C and 4D correspond to this.

The piezoelectric drive type transporting device 11 of the present invention adopts the non-reference vibration that allows the amplitude of the transporting body to be large among the vibration patterns described above. Since the condition for causing the non-standard vibration is l ₁ <l ₂ , the length of the connecting member is set longer than the length of the drive plate 13 in the piezoelectric drive type transport device 11 of the present invention.

[0013]

[Action]

 When an alternating voltage generated from an AC power supply 19 is applied to the piezoelectric drive type transport device 11 of the present invention having the above-described structure, the bimorph 14 causes a flexural vibration which is a non-standard vibration, and the flexural vibration is conveyed through the connecting member 15 to the carrier 16. It is transmitted to the upper conveyance object 18 and the conveyance object 18 is conveyed.

Next, an embodiment of the present invention will be described. In the case where the driving plate has an effective length of 30 mm, its width is 15 mm, the connecting member has an effective length of 35 mm, and its width is 9 mm, and the conveyed product is relatively heavy. The inclination angles α and β of the drive plate and the connecting member shown in FIG. 2 are α = 6 to 8 ° and β = 7 to 9 °, respectively, and α = 13 to 15 ° and β = 0 for relatively lightweight products. A transport speed of up to 2 ° is high, and a maximum of 20 mm / sec can be obtained.

[0015]

[Effect of device]

 The first effect is that by narrowing the distance between the base 17 and the carrier 16, the center of gravity of the piezoelectric drive type carrier 11, including the carrier 18, is lowered, and the stability of the carrier 11 is improved. Has increased.

The second effect is that since the bending vibration of the non-reference vibration is adopted, the amplitude of the carrier 16 can be increased and, as a result, the speed of carrying the goods 18 can be increased. .

[0017]

[Brief description of drawings]

FIG. 1 is a side view of a conventional piezoelectric drive type transport device.

FIG. 2 is a side view of a piezoelectric drive type transport device according to the present invention.

FIG. 3 is an explanatory view for explaining the operation principle of the present invention.

FIG. 4 is a schematic view showing a vibration pattern of a driving plate and a connecting member of the present invention.

[Explanation of symbols]

 1, piezoelectric drive type transfer device 2, piezoelectric element 3, drive plate 4, bimorph 5, connecting member 6, transfer body 7, base 8, transfer product 9, vibration direction 11, piezoelectric drive type transfer device 12, piezoelectric element 13 , Drive plate 14, bimorph 15, connecting member 16, carrier 17, base 18, carrier 19, AC power supply

Claims (1)

[Scope of utility model registration request] 1. A vibrating body in which a piezoelectric element is attached to an elastic plate to vibrate a carrier, and the vibrating body is bent by bending a connecting portion between the elastic plate and the connecting member of the vibrating body. 2. The piezoelectric drive type transfer device, wherein the elastic plate and the connecting member are made non-linear and are arranged between the base and the transfer body.