JPH0378328B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a piezoelectric vibrator that generates minute vibrations by attaching a piezoelectric element to an elastic plate, and The present invention relates to a piezoelectrically driven conveyance device that conveys parts in a supply direction.

[Conventional technology]

As this type of device, for example, Japanese Patent Application Laid-Open No. 62-4119
In the former, the vibrating body provided between the base and the conveyance table is extended to the upper end of an elastic plate to which a piezoelectric element is attached. , a connecting member having a rigidity lower than that of the elastic plate is provided via a connecting means. The latter type of vibrating body is one in which an elastic plate to which a piezoelectric element is attached is extended upward, and a low-rigidity portion having a stiffness lower than that of the elastic plate is provided. A low-rigidity portion extending upward is provided at the upper end of the plate to increase the vibration amplitude.

[Problem to be solved by the invention]

There is a limit to the height between the base of the conveyance device and the conveyance table, which naturally limits the length of the vibrator that is interposed between them, and it becomes difficult to obtain the required vibration amplitude on the conveyance table. In the conveyance device equipped with the vibrating body described in the above-mentioned publication, the problem is solved by extending and providing a low-rigidity portion above the elastic plate.

However, even low-rigidity parts are affected by the load from the conveyor table, so there is a limit to the strength of low-rigidity, and the adjustment technology to obtain the appropriate rigidity is extremely delicate, making it difficult to obtain the desired vibration amplitude. This is surprisingly difficult.

The present invention aims to solve this problem by providing a piezoelectrically driven vibrating body that can withstand loads and obtain a desired vibration amplitude without being affected by height limitations between the base and the conveyor. An object of the present invention is to provide a conveyance device equipped with the same.

[Means to solve the problem]

The piezoelectric vibrator according to the solution means of the present invention has a first
This is because the elastic plate and the second elastic plate are arranged in a folded manner, and the piezoelectric element is attached to either one of the elastic plates.

Next, the piezoelectric drive type conveyance device including the piezoelectric vibrator directly connects one end of the piezoelectric vibrator to the piezoelectric vibrator.
Alternatively, it may be fixed to a base via a bracket, and the other end may be fixed to a conveyor table.

Furthermore, the base and the carrier are arranged vertically on the same plane or close to each other, and one of the elastic plates of the piezoelectric vibrator is connected to the base and the other to the carrier.

〔Example〕

An embodiment of the present invention including a piezoelectric vibrating body and a piezoelectric drive type conveying device equipped with the vibrating body will be described in a state where the piezoelectric vibrating body is incorporated into a bowl feeder. Incidentally, the present invention can also be applied to a linear feeder.

The first embodiment shown in FIGS. 1 and 2 includes a disk-shaped carrier 2 above a disk-shaped base 1,
A bowl (not shown) is placed and fixed on a carrier 2, and a plurality of piezoelectric vibrators 3 are placed between the base 1 and the carrier 2 at equal intervals in the circumferential direction. The upper end of a first elastic plate 5 formed of a plate spring made of metal or synthetic resin is fixed with screws 6 to a bracket 4 which is interposed and stands up on the base 1 to a height close to the support height of the transport platform 2. , the first elastic plate 5 is provided in a downward state at an angle with respect to the bracket 4, piezoelectric elements 7 and 8 are attached to both the front and back sides of the first elastic plate 5, and an alternating current voltage is applied thereto. A second elastic plate 10 is erected at the lower end of the first elastic plate 5 via a connector 9 formed by a spacer, a screw, etc.
The elastic plate 5 is connected in a folded state, and the upper end of the second elastic plate 10 is fixed to the back surface of the conveyor table 2 with screws 11. In addition, the illustrated second elastic plate 1
Although the plate thickness of 0 is thinner than the plate thickness of the first elastic plate 5, it may be the same thickness. In addition, piezoelectric elements 7, 8
may be attached not only to the first elastic plate 5 but also to the second elastic plate 10.

Furthermore, the piezoelectric vibrating body 3 of the second embodiment shown in FIG.
This figure shows a unitary structure bent in a U-shape to form a U-shape, and the other structures are the same as those described above.

In the third embodiment shown in FIG. 4, a first elastic plate 5 and a second elastic plate 10 are connected in a folded V-shape by a connector 12 without a spacer.
Other structures are the same as those described above.

Next, in the fourth embodiment shown in FIGS. 5 and 6, the base 1 is formed in a ring shape, and the conveyance table 2 is formed as a disk that fits inside the base 1, and the upper and lower positions are mutually adjustable. A second elastic plate 1 with piezoelectric elements 7 and 8 is disposed so that the top surfaces thereof are held flush, and a bracket 13 provided on the back surface of the conveyance table 2 includes a second elastic plate 1 having piezoelectric elements 7 and 8;
0 is installed vertically in an inclined state, and the second elastic board 1 is placed next to the second elastic board 10 with the first elastic board 5 folded back.
The first elastic plate 5 is connected parallel to the first elastic plate 1 with screws at its lower ends from the front and back, and the upper end of the first elastic plate 5 is screwed to the back surface of the base 1. Of course, both elastic plates 5 and 10 may be installed with the left and right positions reversed.

The fifth embodiment shown in FIG.
The elastic plate 5 and the second elastic plate 10 are integrally formed with each other via a connecting plate portion 15. Other structures are the same as those described above.

In the sixth embodiment shown in FIG.
Both bases 1 and 2 are each formed of a disk, and a plurality of through holes 16 are bored in the base 1 at equal intervals in the circumferential direction. Second elastic plates 10, 10 are installed obliquely on both sides of the through hole 16 of the table 1, and both second elastic plates 1
A first elastic plate 5 includes piezoelectric elements 7 and 8 that stand up in parallel between 0 and 10 and pass through the through hole 16,
The first elastic plates 5 are connected to each other at their lower ends via a connector 14 similar to the embodiment shown in FIG.
The upper end of the transport table 2 is screwed to the back surface of the conveyor table 2. Note that the piezoelectric elements 7 and 8 are connected to the second elastic plates 10 and 1.
0, and each elastic plate 5, 1
0 and 10 may be integrally formed as in the embodiment shown in FIG.

〔Effect of the invention〕

The piezoelectric vibrating body according to the present invention has first and second elastic plates arranged in a folded manner, and a piezoelectric element is attached to either one of the elastic plates, and minute vibrations generated from the piezoelectric element are provided. is amplified by an elastic plate that does not have a piezoelectric element, and by setting the length and thickness of the elastic plate, and in some cases making supplementary fine adjustments by adding notches etc., the desired size can be achieved. It is capable of outputting vibrations. Also,
Since the vibrating body has a folded structure, the bending moment due to the load applied to the elastic plate to which the piezoelectric element is attached can be effectively reduced.

In the piezoelectric drive type conveyance device including the vibrating body according to the present invention, the vibrating body has first and second elastic plates connected in a folded manner, and the upper ends of both elastic plates are connected to the conveying table and the base. Since it is fixed to the base or to the base via a bracket, the distance between the base and the conveyor can be narrowed as much as possible, and the height of the conveyor can be made low. Even if the distance between the base and the conveyance table is narrow, the work of adjusting the amplitude of the vibrating body can be easily performed without any trouble.

Further, according to the piezoelectric drive type conveyance device including the vibrating body according to the present invention, the upper ends of both the first and second elastic plates can be fixed to the base and the conveyance table. The table can be disposed on the same plane or in the vicinity thereof, and can be easily incorporated into various mechanical units necessary for conveyance.

[Brief explanation of drawings]

FIG. 1 is a side view with main parts cut away showing a piezoelectric drive type conveyance device equipped with a piezoelectric vibrator according to a first embodiment of the present invention, FIG. 2 is a partially cutaway plan view, and FIG. A side view with a main part cut away showing a piezoelectric drive type conveyance device equipped with a piezoelectric type vibrator according to a second embodiment, and FIG. 4 shows a piezoelectric drive type conveyance device equipped with a piezoelectric type vibrator according to a third embodiment. 5 is a side view with the main parts cut away, FIG. 5 is a side view with the main parts cut away showing a piezoelectric drive type conveyance device equipped with a piezoelectric vibrator according to the fourth embodiment, FIG. 6 is a plan view of the same, and FIG. 8 is a perspective view showing a piezoelectric vibrating body according to a fifth embodiment, and FIG. 8 is a side view with main parts cut away showing a piezoelectric drive type conveying device equipped with a piezoelectric vibrating body according to a sixth embodiment. DESCRIPTION OF SYMBOLS 1... Base, 2... Transport platform, 3... Piezoelectric vibrator, 4... Bracket, 5... First elastic plate, 7,
8... Piezoelectric element, 10... Second elastic plate.

Claims (1)

[Claims] 1. A first elastic plate 5 and a second elastic plate 10 are arranged in a folded manner, and a piezoelectric element 7, 8 is attached to either one of both elastic plates 5, 10. A piezoelectric vibrator 2 is a piezoelectric type in which a first elastic plate 5 and a second elastic plate 10 are arranged in a folded manner, and a piezoelectric element 7, 8 is attached to either one of the elastic plates 5, 10. A piezoelectric drive type conveyance device characterized in that one end of the vibrating body is fixed to a base 1 directly or via a bracket 4, and the other end is fixed to a conveyance table 2. 3. The piezoelectric drive type conveyance device according to claim 2, wherein the base 1 and the conveyance table 2 are vertically flush with or close to each other.