JPH028110A - Vibrating parts feeder - Google Patents

Abstract

PURPOSE:To promote a Lissajous vibration in a vessel installed in an upper mass body by connecting lower end of a first plate spring with a piezoelectric element to a lower mass body upon making it upright, while connecting a second plate spring, larger in springing properties, in the first plate spring, and connecting an upper end of this second plate spring to the upper mass body after bending it. CONSTITUTION:A parts vessel 11 is mounted on top of an upper mass body 22, and on the underside, there are provided with plural pieces of projections 22a in circumferential form. On top of a lower mass body 23, there are provided with plural pieces of convexities 23a in corresponding to these projections 22a. A first plate spring 14 to which a piezoelectric element 17 is stuck is tightly attached to the projections 23a in making its major axis in the vertical direction, and a second plate spring 25 larger than in springing properties than the first plate spring 14 is screwed down to the upper end. This plate spring 25 is bent and its tip is tightly attached to the projection 22a. With this structure, vibrations in two different direction having a phase difference each are composed together and subjected to a Lissajous vibration, thus movement of parts in the vessel 11 is efficiently performable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibrating component supply device, and is particularly directed to improving the vibration system.

A conventional parts supply device will be explained according to the drawings. In Figures 1 and 2, ■ is an inverted truncated cone-shaped parts container that stores parts, and a parts feeding path called a track is provided inside, and the parts are aligned on the track by vibration of the whole. , and are sent out in a predetermined direction.

Reference numeral 2 denotes a disk-shaped upper mass body, on the upper surface of which the component container 1 is mounted, and on the lower surface thereof a plurality of protrusions 2a are provided in the circumferential direction. Reference numeral 3 denotes a lower IItiI body, and convex portions 3a are provided on the upper circumference of the upper surface of the body so as to correspond to the convex portions 2a. Reference numeral 4 is a temporary spring which is fixed with one end to the convex portion 2a and the other end to the convex portion 3a with screws, respectively, and connects the upper mass body 2 and the lower mass body 3.

A piezoelectric element or an electromagnetic type vibration device (not shown) serving as a driving source is attached to the leaf spring 4 or the lower mass body 3.

In such a configuration, when the vibration device is driven, the lower mass body 3 and the upper mass body 2 vibrate via the leaf spring 4, vibrating the component container 1, and causing the components stored in the component container l to vibrate. It is moved along the track of the parts container 1. In this case, the vibration is caused by the convex portion 2a of the upper mass body 2 at the upper end of the leaf spring 4.
The part fixed with a screw to vibrates in the direction of arrow A-A', and the component container l vibrates in a mode in which rotational movement and vertical movement are combined.

Since a plurality of leaf springs 4 are arranged on the circumference of the upper mass body 2 and the lower mass body 3, a single leaf spring 4 will vibrate in a linear direction, but as a whole, the upper mass body 2 and the parts container 1 are moved in the rotational direction.

The vibration in this case is a single vibration system formed by a set of a plurality of leaf springs 4, an upper mass body 2, and a lower mass body 3, and even if there are multiple leaf springs 4, they all have the same phase. Since it operates as follows, it can be thought of as operating as a single leaf spring.

This vibration also oscillates in an almost linear range inclined as shown by the arrow A-A'.Moreover, if this vibration mode is a sine wave, it is difficult to obtain sufficient advancement of the part, but the electromagnet's attraction A force-driven vibration excitation device that uses a magnet or the like for vibration is designed to change the speed between the outward and return paths of vibration to obtain more forward motion.

However, even with the excitation method of the excitation electromagnet, when excitation is performed at a frequency near the resonance point, the vibration mode ends up becoming a sine wave, making it difficult to obtain much forward movement. Therefore, it is necessary to excite at a frequency that is far off the resonance point, resulting in a large amount of energy being required to obtain the necessary amplitude.

In addition, when using a piezoelectric element as a driving source, it is a good idea to vibrate at a resonant frequency, so a large amount of energy is not required.
The efficiency of moving parts was poor.

The present invention was made in an attempt to eliminate the drawbacks of the prior art as described above, and in order to excite at a frequency near the resonance point and to minimize the excitation energy, two different It is an object of the present invention to provide a vibrating component supply device that can efficiently move components by combining directional vibrations to give vibrations in a so-called Lissajous waveform (i.e., Lissajous vibrations).

An embodiment of the present invention will be described in detail below with reference to the drawings in which corresponding parts are denoted by the same reference numerals.

In Fig. 3, reference numeral 11 is an inverted truncated cone-shaped parts container for storing and moving parts, and a part feeding path called a track is provided inside, and the parts are moved by vibration of the whole. They are arranged on a track and sent out in a predetermined direction.

Reference numeral 22 denotes an upper mass body in the form of a disk (or a square plate), on which the parts container 11 is removably attached, and on the lower surface three or more parts are placed 120' apart on the circumference of a predetermined radius. 9
A plurality of prismatic convex portions 22a, such as four located 0° apart.
has been established.

Reference numeral 23 denotes a disk-shaped (or square plate-shaped) lower mass body, on the upper surface of which a prismatic protrusion 23a is provided corresponding to the protrusion 22a.

14 is a rectangular leaf spring whose one end is fixed to the convex portion 23a with a screw so that its long sleeve extends in the vertical direction;
Together with the lower mass body 23, it forms a lateral vibration system.

Reference numeral 25 denotes a rectangular leaf spring which is bent at a right angle to the thickness direction with the bent portion being an arc, and has greater springiness than the leaf spring 14, with one end forming the convex portion 22a and the other end forming the leaf spring 1.
4, and form a vertical vibration system together with the upper mass body 22.

A pair of piezoelectric elements 17 are attached as driving sources to both sides of the leaf spring 14, and each is driven by an external power source (not shown) via a lead wire 18.

In this case, it goes without saying that the piezoelectric element 17 only needs to be provided on one side.

Here, the term "lateral direction" includes cases where there is a slight inclination from the horizontal direction. In addition, cases in the vertical direction also include cases in which there is a slight inclination from the vertical direction.

Next, the operation will be explained. Piezoelectric element 1 via lead wire 18
When a driving voltage is applied to 7, the leaf spring 14 is excited in the horizontal direction, and the vibration is transmitted to the leaf spring 25, and the tip of the leaf spring 25 is excited in the vertical direction so as to follow the vibration of the leaf spring 14. As a result, rotational twisting and vertical vibration are excited in the upper mass body 22 and the component container 11.

In this embodiment, the leaf spring 25 is bent to the right, so when the leaf spring 14 vibrates in the lateral direction, the parts container 11 vibrates in an oblong shape (Lissajous figure shape), and the parts inside the parts container 11 are vibrated. moves forward as if rotating clockwise.

On the other hand, when the leaf spring 25 is bent to the left as shown in FIG. advances in a rotational manner in the opposite direction (i.e., counterclockwise).

By creating a phase difference between the two vibration systems in this manner, the horizontal vibration system including the leaf spring 14 can be used at a frequency near the resonance point. In other words, in the case of FIG. 3, by vibrating the leaf spring 14 at the resonant frequency, the leaf spring 25 is excited in the vertical direction, but since the leaf spring 25 has greater springiness than the leaf spring 14, the vertical vibration is , deviates from the resonant frequency, so the amplitude of the vertical vibration is extremely small compared to the amplitude of the lateral vibration.

Incidentally, if a member that vibrates in the vertical direction is not provided as in the case of FIG. On the other hand, by avoiding the resonant frequency as in the case of Figure 3, the amplitude of the vertical vibration can be moderately suppressed, and the The problem of the upward phenomenon can be effectively solved.

In addition, according to the embodiment shown in FIG. 3 or 4, the protrusion 22a does not require high precision in manufacturing, so it is easy to process, and the upper mass body 22 and the lower mass body 23 are There is no need to prepare one for right rotation and one for left rotation, and it is only necessary to reverse the direction of the leaf spring for vertical vibration, which further simplifies component management during the manufacturing process.

FIG. 5 shows another embodiment, in which a leaf spring portion for lateral vibration and a leaf spring portion for vertical vibration are integrated.

In FIG. 5, the parts container 11 is attached to the upper surface of the disc-shaped upper mass body 72, and the parts container 11 is placed on the lower surface on the circumference of a predetermined radius.
A plurality of prismatic protrusions 72a are provided, respectively.

A prismatic protrusion 73a is provided on the upper surface of the disk-shaped lower mass body 73 in correspondence with the protrusion 72a.

The leaf spring 74 is bent almost perpendicularly to the thickness direction with the bent part being an arc, and by making the horizontal leaf spring part 74b thinner than the vertical leaf spring part 74a, the respective resonant frequencies are different. There is. The lower end of the vertical leaf spring portion 74a of the leaf spring 74 is fixed to the protrusion 73a with a screw, and the upper end of the horizontal leaf spring portion 74b is fixed to the protrusion 72a with a screw.

In the configuration shown in FIG. 5, the piezoelectric element 17 causes the leaf spring 7 to
When the leaf spring part 74a of No. 4 vibrates, the vibration is transmitted to the leaf spring part 74b, thereby exciting the upper mass body 72 and the parts container 11, and moving the parts stored in the parts container 11.

In this case, since the resonant frequencies of the leaf spring part 74a and the leaf spring part 74b are different from each other, the leaf spring part 74a acts as a lateral vibration system, and the leaf spring part 74b acts as a vertical vibration system, so that the parts The parts stored in the container 11 can be moved.

In this way, according to the configuration of FIG.
A leaf spring portion 74a that extends in the vertical direction when the component container 11 is subjected to Lissajous vibration in the same manner as described above with reference to the figure.
By being able to vibrate at a resonant frequency, it is possible to generate vibrations with high efficiency (large amplitude vibrations, but in addition to this, it is possible to use one temporary spring component as the leaf spring 74, which makes assembly easier. Work can be simplified.

FIG. 6 shows still another embodiment, in which the present invention is applied to a linear conveyance type component supply device.

A rectangular dish-shaped component container 81 is removably mounted on the upper surface of a rectangular plate-shaped lower mass body 82. A convex portion 83a is provided at a predetermined position on the upper surface of the rectangular plate-shaped lower mass body 83,
83b is provided, and a plate spring 14 for transverse vibration is screwed and fixed at its lower end to the convex portions 83a and 83b, respectively.

The leaf spring 25 that vibrates in the vertical direction has its upper end connected to the upper material H body 8.
It is fixed to the lower surface of 2 with a screw, and its lower end is fixed to the leaf spring 14 with a screw.

In the configuration shown in FIG. 6, when a driving voltage is applied to each piezoelectric element 17 via the lead wire 18, the two leaf springs 1
4 causes the parts container 82 to undergo Lissajous vibration in the long sleeve direction through the leaf springs 25, thereby moving the parts stored in the parts container 81. In this case as well, a phase difference is generated between the lateral vibration system and the vertical vibration system, so that the parts can be moved in a straight line efficiently.

As described above, according to the present invention, the thick temporary spring part excited by the vibration drive source causes the thin plate spring part extending from the tip thereof to be driven to vibrate, thereby causing the lateral direction The vibration system of the component can be efficiently vibrated at a period synchronized with the natural frequency, and the vibration system of the vertical direction can be caused to vibrate with a predetermined phase difference with respect to the vibration phase of the horizontal direction. A vibrating component supply device capable of vibrating a container with Lissajous vibration can be easily realized.

2.82... Upper mass body, 3.23.73.8
3... lower mass body, 4.14.25.74...
...Plate spring, 17...Piezoelectric element.

Claims (2)

[Claims] (1) An upper mass body and a lower mass body arranged vertically opposite each other, a component container mounted on the upper surface of the upper mass body, and a piezoelectric element having one end connected to the lower mass body and serving as a driving source. a rectangular first leaf spring portion that is attached to the lower mass body and forms a first vibration system together with the lower mass body;
a second leaf spring part that is connected between the leaf spring parts of the second leaf spring part, has a spring property greater than that of the first leaf spring part, and forms a second vibration system that follows the first vibration system together with the upper mass body; The first leaf spring part is configured of a first leaf spring arranged to extend in the vertical direction, and the second leaf spring part is arranged at an upper end of the first leaf spring. After the lower end is fixed and bent in the thickness direction as it goes from the lower end to the upper end, the upper end is fixed to the lower surface of the upper mass body and has a spring property greater than that of the first leaf spring. A vibrating parts supply device characterized by being configured with a second leaf spring. (2) An upper mass body and a lower mass body arranged vertically opposite each other, a component container mounted on the upper surface of the upper mass body, and a piezoelectric element having one end connected to the lower mass body and serving as a driving source. a rectangular first leaf spring portion that is attached to the lower mass body and forms a first vibration system together with the lower mass body;
a second leaf spring part that is connected between the leaf spring parts of the second leaf spring part, has a spring property greater than that of the first leaf spring part, and forms a second vibration system that follows the first vibration system together with the upper mass body; The first and second leaf spring portions are composed of a single leaf spring having a thick root portion and a tip portion thinner than the root portion, and the root portion extends in the vertical direction. The extended lower end is fixed to the upper surface of the lower mass body, and the tip portion is bent in the thickness direction from the root portion to the tip, and then the tip is fixed to the lower surface of the upper mass body. A vibrating parts feeding device characterized by: