JPH0725411B2 - Vibratory parts feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibrating component supply apparatus, and particularly to improving a vibrating system.

A conventional component supply device will be described with reference to the drawings. In FIG. 1 and FIG. 2, reference numeral 1 denotes an inverted frustoconical component container for accommodating components, and a component feeding path called a track is provided inside the component container. They are aligned and delivered in a predetermined direction.

Reference numeral 2 denotes a disc-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 convex portions 2a are provided in the circumferential direction. Reference numeral 3 denotes a lower mass body, and the convex portions 3a are provided on the circumference of the upper surface of the lower mass body so as to correspond to the convex portions 2a. Reference numeral 4 denotes a leaf spring, one end of which is inclined to the convex portion 2a and the other end of which is inclined to the convex portion 3a and fixed with screws, respectively.
And are connected.

A piezoelectric element serving as a drive source or an electromagnetic type vibration device (not shown) 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 through the leaf springs 4 to vibrate the component container 1 to remove the components stored in the component container 1. The parts container 1 is moved along the track. The vibration in this case 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 vibrates in the direction of arrow AA ', and the component container 1 vibrates in a mode in which the rotational movement and the 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, one leaf spring 4 vibrates in a linear direction, but as a whole, 2 and the component 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, the upper mass body 2 and the lower mass body 3. Since they operate in the same phase, it can be considered that they are operating as one leaf spring.

This vibration also vibrates in a substantially linear range inclined as shown by the arrow A-A '. Further, when this vibration mode is a sine wave, it is difficult to obtain sufficient advancement, but the attractive force of the electromagnet causes the vibration. A vibrating device using a vibrating electromagnet of a driving type or the like is configured to change the speed in a forward path and a return path of vibration to obtain more forward movement.

However, even in the excitation method of the excitation electromagnet, if the excitation is performed at a frequency near the resonance point, the oscillation mode becomes very similar to a sine wave, and it is difficult to obtain much forward movement. Therefore, it is necessary to vibrate at a frequency with the resonance point largely removed, resulting in a large amount of energy required to obtain the required amplitude.

Further, when a piezoelectric element is used as a drive source, it is a good idea to vibrate at the resonance frequency, so large energy is not required, but since the forward and backward paths of vibration are the same,
The efficiency of moving parts was poor.

The present invention has been made in an effort to eliminate the above-mentioned drawbacks of the prior art, and it excites at a frequency near the resonance point and, in order to minimize the excitation energy, they are different from each other with a phase difference. An object of the present invention is to provide a vibration-type component supply device that synthesizes vibrations in directions to give a vibration having a so-called Lissajous waveform (that is, Lissajous vibration) to efficiently move components.

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

In FIG. 3, reference numeral 11 denotes an inverted frustoconical part container for accommodating parts and moving the parts. A parts feeding path called a track is provided inside the container, and the whole part vibrates. The parts are aligned with the track and delivered in a predetermined direction.

Reference numeral 22 denotes a disk-shaped (or a square-plate-shaped) upper mass body, on the upper surface of which the component container 11 is detachably mounted, and on the lower surface thereof, three circles each having a predetermined radius, separated by 120 °, or three or Plural prism-shaped convex portions 22a are provided at four positions 90 degrees apart.

Reference numeral 23 denotes a disk-shaped (or rectangular plate-shaped) lower mass body, and a prism-shaped convex portion 23a corresponding to the convex portion 22a is provided on the upper surface thereof.

Reference numeral 14 denotes a rectangular leaf spring, one end of which is fixed to the convex portion 23a with a screw so that its long axis extends in the vertical direction, and forms a lateral vibration system together with the lower mass body 23.

Reference numeral 25 denotes a rectangular leaf spring bent at a right angle in the thickness direction with the bent portion formed into an arc, and has a spring property (in other words, a small spring constant) larger than that of the leaf spring 14, and one end thereof has a convex portion 22.
At a, the other end is fixed to the upper end of the leaf spring 14 with a screw, respectively, thus forming a vertical vibration system together with the upper mass body 22.

Reference numeral 17 denotes a pair of piezoelectric elements, which are attached to both surfaces of the leaf spring 14 as drive sources and are driven by an external power source (not shown) via the lead wires 18, respectively.

In this case, it is needless to say that the piezoelectric element 17 may be provided on only one side.

Here, the lateral direction also includes a case where it is slightly inclined from the horizontal. In addition, the case of vertical direction is also included if it is slightly inclined from the vertical direction.

Next, the operation will be described. When a drive voltage is applied to the piezoelectric element 17 via the lead wire 18, the leaf spring 14 is excited in the lateral direction, the vibration is transmitted to the leaf spring 25, and the tip of the leaf spring 25 is a leaf spring.
Excitation is performed in the vertical direction so as to follow the vibration of 14, and as a result, the upper mass body 22 and the component container 11 are excited to rotate and twist and vertically vibrate.

In the case of this embodiment, since the leaf spring 25 is bent to the right, when the leaf spring 14 vibrates in the lateral direction, the component container 11 vibrates in an elliptical shape (Lissaille figure shape), and the component container 11 is filled with components. Moves forward to rotate clockwise.

On the other hand, when the leaf spring 25 is bent to the left as shown in FIG. 4, the Lissajous vibration direction of the component container 11 with respect to the lateral vibration of the leaf spring 14 is reversed, whereby the components in the component container 11 are reversed. Moves forward to rotate in the opposite direction (ie counterclockwise).

By thus causing a phase difference between the two vibration systems, the lateral vibration system including the leaf spring 14 can be used at a frequency near the resonance point. That is, in the case of FIG. 3, the leaf spring 25 is excited in the vertical direction by vibrating the leaf spring 14 at the resonance frequency.
Since the spring constant is smaller, the vertical vibration deviates from the resonance frequency, and therefore the vertical vibration amplitude becomes extremely smaller than the lateral vibration amplitude.

If a member that vibrates in the vertical direction is not provided as in the case of FIG. 2, the amplitude of the vertical vibration exceeds a suitable level, and the component stored in the component container 11 jumps up. On the contrary, while the phenomenon causes the forward movement to be obstructed, the amplitude of the vertical vibration can be appropriately suppressed by avoiding the resonance frequency as in the case of FIG. The problems that arise can be effectively resolved.

In addition to this, according to the embodiment of FIG. 3 or FIG. 4, since the manufacturing convex portion 22a does not require height accuracy, it is easy to process, and as the upper mass body 22 and the lower mass body 23, It is not necessary to prepare one for right turn and one for left turn,
All you have to do is reverse the direction of the leaf spring for vertical vibration.
As a result, component management during the manufacturing process can be further simplified.

FIG. 5 shows another embodiment in which a leaf spring portion that vibrates in the lateral direction and a leaf spring portion that vibrates in the vertical direction are integrated.

In FIG. 5, the component container 11 is mounted on the upper surface of a disk-shaped upper mass body 72, and a plurality of prism-shaped convex portions 72a are provided on the lower surface on the circumference having a predetermined radius.

A prism-shaped convex portion 73a is provided on the upper surface of the disc-shaped lower mass body 73 corresponding to the convex portion 72a.

The leaf spring 74 is bent substantially at a right angle in the thickness direction with the bent portion formed into an arc, and by making the plate thickness of the horizontal leaf spring portion 74b thinner than the vertical leaf spring portion 74a, the respective resonance frequencies are different. There is. The lower end of the vertical leaf spring portion 74a of the leaf spring 74 has a convex portion 7
The horizontal plate spring portion 74b is fixed to the convex portion 72a with a screw.

In the configuration of FIG. 5, the piezoelectric element 17 causes the leaf spring portion 74a of the leaf spring 74 to vibrate. The vibration is transmitted to the leaf spring portion 74b to excite the upper mass body 72 and the component container 11 to move the components housed in the component container 11.

In this case, since the resonance frequencies of the leaf spring portion 74a and the leaf spring portion 74b are different from each other, the leaf spring portion 74a acts as a lateral vibration system and the leaf spring portion 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. 5, FIG. 3 and FIG.
In the same manner as described above with reference to the drawings, when the component container 11 is vibrated in Lissajous, it is possible to efficiently vibrate with a large amplitude by vibrating the leaf spring portion 74a extending in the vertical direction at the resonance frequency. In addition to this, since one leaf spring component can be used as the leaf spring 74, the assembling work can be simplified accordingly.

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

The rectangular dish-shaped parts container 81 is a rectangular plate-shaped upper mass body.
It is detachably attached to the upper surface of 82. Convex portions 83a, 83b are provided at predetermined positions on the upper surface of the rectangular plate-shaped lower mass body 83, and the leaf spring 14 for lateral vibration has convex portions 83a, 8b at its lower end portion.
It is fixed to each 3b with a screw.

The leaf spring 25 that vibrates in the vertical direction has its upper end fixed to the lower surface of the upper mass body 82 with a screw, and the lower end of the leaf spring 25.
It is fastened with screws.

In the configuration of FIG. 6, the piezoelectric element 17 is connected via the lead wire 18.
When a drive voltage is applied to each of the two leaf springs 14, the two leaf springs 14 cause the component container 82 to vibrate Lissajous in the major axis direction via the leaf springs 25, respectively, and thus move the components stored in the component container 81. Also in this case, a phase difference is generated between the horizontal vibration system and the vertical vibration system, so that the component can be efficiently moved straight.

As described above, according to the present invention, by virtue of the leaf spring portion that is excited by the vibration driving source, the leaf spring portion that is thin and extends from its tip end is driven by the thick leaf spring portion. A horizontal vibration system can be efficiently vibrated in a cycle synchronized with a natural frequency, and a vibration having a predetermined phase difference with respect to the horizontal vibration phase is generated in the vertical vibration system. As a result, it is possible to easily realize a vibrating component supply device that can vibrate the component container in Lissajous.

As described above, in the vibration-type component supply device of the present invention, the first plate spring part of the plate spring part excited by the vibration drive source is arranged so as to extend in the vertical direction. The second leaf spring portion has a lower end portion fixed to the upper end portion of the first leaf spring portion, bends in the thickness direction from the lower end portion to the upper end portion, and then the upper end portion. Is fixed to the lower surface of the upper mass body and is composed of a second leaf spring having a spring constant smaller than that of the first leaf spring. Therefore, the desired characteristics can be obtained by adjusting the thickness of the leaf spring used there. It is easy to provide a vibrating-type component supply device having the above-mentioned structure, and it is possible to reduce energy consumption due to the property of the piezoelectric element forming the driving source, and there is an effect that it does not actually fail for a long period of time. Further, by selecting and using an appropriate material and size of the leaf spring portion, there is an effect that the function of the vibration type component supply device of the present invention can be improved. Further, as described above, in the vibration-type component supply device of the present invention, the first and second plate spring portions are one plate having a thick root portion and a tip portion thinner than the root portion. It is composed of a spring, the root portion extends in the vertical direction and the lower end is fixed to the upper surface of the lower mass body, and the tip portion bends in the thickness direction from the root portion to the tip portion, and then the tip portion. Is fixed to the lower surface of the upper mass body, it is easy to provide a vibration type component supply device having desired characteristics by adjusting the thickness of the leaf spring part used there, and at the same time the drive source is The property of the formed piezoelectric element can reduce energy consumption and, in effect, has an effect of not breaking down for a long period of time.

[Brief description of drawings]

1 and 2 are partially cutaway perspective views and front views showing a conventional vibration type component supplying apparatus, and FIGS. 3 and 4 are front views showing an embodiment of the vibration type component supplying apparatus according to the present invention. , Fifth
6 and 6 are front views showing another embodiment of the present invention. 1, 11, 81, ... parts container, 2, 22, 72, 82 ... upper mass body, 3, 23, 73, 83 ... lower mass body, 4, 14, 25, 74
...... Leaf spring, 17 …… Piezoelectric element.

Claims (2)

[Claims] 1. An upper mass body and a lower mass body which are vertically opposed to each other, a component container mounted on an upper surface of the upper mass body, and one end of which is connected to the lower mass body to form a driving source. A piezoelectric first element is attached, and a rectangular first leaf spring portion that forms a first vibration system together with the lower mass body is connected between the upper mass body and the first leaf spring portion. A second leaf spring portion having a spring constant smaller than that of the leaf spring portion, and forming a second vibrating system that follows the first vibrating system together with the upper mass body. The portion is composed of a first leaf spring arranged so as to extend in the up-down direction, and the second leaf spring portion has a lower end portion fixed to an upper end portion of the first leaf spring portion and the lower end portion. From the upper part to the upper part, the upper part is bent below in the thickness direction. It is secured to, vibratory parts feeder being characterized in that is constituted by a second leaf spring having a smaller spring constant than the first plate spring. 2. An upper mass body and a lower mass body which are vertically opposed to each other, a component container mounted on the upper surface of the upper mass body, and one end of which is connected to the lower mass body to form a drive source. A piezoelectric first element is attached, and a rectangular first leaf spring portion that forms a first vibration system together with the lower mass body is connected between the upper mass body and the first leaf spring portion. A second leaf spring portion having a spring constant smaller than that of the leaf spring portion and forming a second vibrating system that follows the first vibrating system together with the upper mass body. The leaf spring portion is composed of one leaf spring having a thick root portion and a tip portion thinner than the root portion, the root portion extending vertically and the lower end of the lower mass body. Fixed to the upper surface, the tip portion goes from the root portion to the tip portion Thus after bent in the thickness direction, vibratory parts feeder to which the tip portion, characterized in that secured to the lower surface of the upper mass.