JPH0717256B2 - 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 portion fixed by the 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 arrow AA '. Moreover, when this vibration mode is a sine wave, it is difficult to obtain sufficient advancement of parts, but it is driven by the attractive force of the electromagnet. A vibrating device using a vibrating electromagnet or the like of the type is adapted to obtain more forward movement by changing the speed in the forward and backward paths of vibration.

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 are delivered in a predetermined direction.

12 is a disk-shaped (or rectangular plate-shaped) upper mass body, on the upper surface of which the component container 11 is detachably mounted, and on the lower surface on a circle with a predetermined radius, if it is excited, there are three Or 90 ° apart 4
As described above, a pair of convex portions 12a and 12b each having a prismatic shape and having a predetermined different height are provided at a plurality of positions at predetermined intervals.

13 is a disk-shaped (or square-plate-shaped) lower mass body, and has a prism-shaped convex portion on the upper surface corresponding to the central portion of the convex portions 12a and 12b.
13a is provided.

Reference numeral 14 denotes a rectangular leaf spring of a predetermined size having a prism-shaped mounting member 15 fixed to one end thereof, and the lower end in the major axis direction is a convex portion.
The lower mass body 13 is fixed to the lower mass body 13 by being screwed to 13a so as to extend vertically substantially vertically, and the lower mass body 13 and the leaf spring 14 form a lateral vibration system.

Reference numeral 16 denotes a rectangular leaf spring, which has a spring property larger than that of the leaf spring 14 (in other words, a small spring constant), and the upper end portion is screwed to the lower end surface of the convex portion 12a and the lower end portion. Is screwed to the lower end surface of the convex portion 12b. A mounting member 15 is screwed and fixed in the vicinity of the central portion, and thus the upper mass body 12 and the leaf spring 16 form a vertical vibration system. Here, the protrusions 12a and 12b are selected to have different heights (in this embodiment, the protrusion 12b is higher than the protrusion 12a), whereby the leaf spring 16 is inclined with respect to the leaf spring 14. They are connected to intersect.

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 term “lateral direction” also includes a case in which there is a slight inclination from the horizontal direction. 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, and the vibration is transmitted to the leaf spring 16 so that the leaf spring 16 can be moved.
It is excited in the vertical direction so as to be driven by the vibration of, and as a result, the upper mass body 12 and the component container 11 are excited to rotate and twist and vertically vibrate.

Since the leaf spring 16 is previously inclined to the right downward from the horizontal at a predetermined angle, the cycle delay of the vertical vibration with respect to the lateral vibration of the leaf spring 14 becomes the right direction, and the front peripheral portion of the component container 11 is in front. When viewed further, it vibrates in an elliptical shape (Lissaille figure shape) as indicated by arrow B, and the forward direction of the parts is counterclockwise when the parts container 11 is viewed from above.

On the other hand, unlike the case of FIG. 3, when the leaf spring 16 is inclined to the upper right, the cycle delay of the vertical vibration with respect to the lateral vibration of the leaf spring 14 is leftward, and the forward direction of the component is Clockwise.

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 16 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.

FIG. 4 shows the second embodiment, in which the disk-shaped upper mass body 62 has the component container 11 mounted on the upper surface thereof and has a predetermined space on the lower surface on the circumference having a predetermined radius. In addition, a plurality of pairs of convex portions 62a and 62b each having a prismatic shape with a predetermined different height are provided.

The disk-shaped lower mass body 63 has a pair of protrusions 62a and 62b on its upper surface.
Corresponding to the prism-shaped convex portion 63b.

In this case, the leaf spring 14 has a mounting member 65 fixed to the upper end thereof, and the lower end thereof fixed to the convex portion 63a with a screw. Reference numeral 66 is a rectangular leaf spring, which is composed of three parts having substantially equal lengths in the long axis direction, the left end of which is higher than the central part and the right end of which is lower than the central part. Each convex portion 62a
And 62b are fixed to the lower surface with screws, and the central part is
It is fixed to 5 with screws.

In the configuration of FIG. 4, when the leaf spring 14 vibrates by the piezoelectric element 17, the vibration is transmitted to the leaf spring 66, which excites the upper mass body 62 and the component container 11 to cause the component container 11 to move.
Move the parts stored in. In this case, leaf spring
66 is the same as that described above with reference to FIG.
It is thought that it vibrates in the same direction as the leaf spring that connects points screwed to 2b with a straight line.

According to this structure, the same effect as in the case of FIG. 3 can be obtained, and in addition to this, since the lower end surfaces of the convex portions 62a and 62b of the upper mass body 62 are substantially horizontal, processing is easy. Become.

FIG. 5 shows the embodiment of FIG. 3, in which the disk-shaped upper mass body 52 has the component container 11 mounted on the upper surface thereof and has a predetermined space on the lower surface thereof on a circumference having a predetermined radius. A plurality of prism-shaped projections 52a and 52b each having the same height are provided.

Lower mass disc-shaped 53 is provided with a convex portion 53a of the prismatic forming an inclined surface 53a ₁ so as to correspond to the pair of convex portions 52a and 52b at its upper end. A mounting part 55 is attached to the upper end of the leaf spring 14.
Is fixed, and the lower end is screwed to the inclined surface 53a ₁ of the convex portion 53a. The leaf spring 16 has projections 52 at both ends.
It is screwed to the lower end faces of a and 52b, and the central part is
It is screwed to.

Thus, the leaf spring 14 extends obliquely upward so as to cross the leaf spring 16 extending in the horizontal direction to form a lateral vibration system, and the leaf spring 16 forms a vertical vibration system. To do.

In the configuration of FIG. 5, when the vibration generated in the leaf spring 14 by the piezoelectric element 17 is transmitted to the leaf spring 16, the upper mass body 52
Also, the parts container 11 is excited, and thereby the parts housed in the parts container 11 are moved. In this case as well, a phase difference is generated between the horizontal vibration system and the vertical vibration system, and the component can be moved in the rotation direction determined by the inclination direction of the leaf spring 14.

According to the embodiment of FIG. 5, the same effect as described above with reference to FIG. 3 can be obtained, and in addition, the convex portions 52a and 52b of the upper mass body 52 can be processed to have the same height. Therefore, the processing becomes easier.

As described above, according to the present invention, since the component container is excited by the second leaf spring coupled to the first leaf spring excited by the vibration drive source, It is possible to efficiently vibrate the vibration system in a cycle that is synchronized with the natural frequency, and to generate vibration having a predetermined phase difference with respect to the lateral vibration phase in the vertical vibration system, so that the component container It is possible to easily realize a vibrating component supply device capable of vibrating Lissajous.

[Brief description of drawings]

1 and 2 are partially cutaway perspective views and front views showing a conventional vibration type component supplying device, and FIG. 3 is a front view showing an embodiment of the vibration type component supplying device according to the present invention, and FIG. And the fifth
The drawing is a front view showing another embodiment of the present invention. 1, 11 ... Parts container, 2,12,52,62 ... Upper mass body,
3, 13, 53, 63 ... Lower mass body, 4, 14, 16, 66 ... Leaf spring, 17 ... Piezoelectric element.

Claims (1)

[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 a piezoelectric body whose one end is connected to the lower mass body and which serves as a driving source. A rectangular first leaf spring to which an element is attached and which forms a first vibration system together with the lower mass body, and smaller than the first leaf spring connected between the upper mass body and the first leaf spring A second leaf spring that has a spring constant and forms a second vibrating system that follows the first vibrating system together with the upper mass body, and the first leaf spring has its major axis in the vertical direction or The second plate spring is arranged so as to extend obliquely upward, and the second plate spring is arranged so that its major axis crosses the major axis of the first plate spring obliquely. Both ends in the long axis direction are fixed to the lower surface of the upper mass body, and the central portion in the long axis direction is A vibrating component supply device, characterized in that it is fixed to the upper end of the first leaf spring.