JP2001048338A - Oscillation aligning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perfectly select components and improve yield by decreasing resonance frequency determined depending on a spring constant of a spring and a mass of a track forming member than a frequency of a track, and oscillating the track forming member with phase shifted by a specific phase from the oscillation of the track. SOLUTION: A work W with a normal attitude with longer sides directed in the transferring direction, among plate-like works W transferred left by oscillation, is transferred to the next process without going to a notch 3 formed in a part of a track 2. A work W with a attitude with shorter sides directed in the transferring direction is transferred while its part abuts on a track forming member 5 via an oscillatable spring provided in the notch 3. This track forming member 5 is oscillated with phase shifted by 180 deg. from the oscillation of the track 2, so that the work W is transferred left by oscillation while receiving a rotating force counterclockwise about a center of gravity G, corrected to the attitude with longer sides directed in the transferring direction, and supplied to the next process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vibration alignment device.

[0002]

2. Description of the Related Art FIG. 13 shows a main part of a conventional vibrating parts feeder. A track 2 is formed on a side wall 1 in a substantially vertical direction. Transported in the direction. Subsequent same part M2
Is rotated 90 ° with respect to M1, and the subsequent same part M3 is transported in the same attitude as M1.
A notch 2a is formed in a part of the truck 2, and the part M1 passes through the notch 2a as it is, but the part M2 has its center of gravity G
Is located at the position as shown in the figure, it turns by gravity around the edge of the notch 2a and falls into the bowl of the vibrating parts feeder. Subsequent parts M3, like M1, pass through here and are supplied to the next step.

The means for arranging the plate-like parts M1, M2 and M3 in the conventional vibrating parts feeder is constructed as described above. However, parts in the posture of the part M2 are mixed at a probability of about 50%. The efficiency of the parts supplied in a predetermined posture to the next process is about 50%.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a vibration aligning apparatus capable of supplying components to a next process in a predetermined posture.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to move a part in a predetermined direction on a track by vibrating a track, and to place the part in a predetermined posture by a part alignment means and supply the part to a next step. In the vibration alignment device, the component alignment means causes a notch to be formed in a part of the track,
The track forming member is supported by a spring so as to be able to vibrate in the notch so as to be flush with the track, and the resonance frequency determined by the spring constant of the spring and the mass of the track forming member is smaller than the vibration frequency of the track. Then, the vibration alignment device is characterized in that the track forming member is caused to vibrate at a phase shifted from the track vibration by about 180 degrees.

Alternatively, in a vibration aligning apparatus, a part is moved in a predetermined direction by vibrating a track and the part is arranged in a predetermined posture by a part aligning means and supplied to the next man-hour. The means forms a notch in a part of the track, and supports the track forming member by a leaf spring so as to be able to vibrate within the notch so as to be flush with the track, and attaches a piezoelectric element to the leaf spring. Further, the present invention solves the above problem by a vibration alignment device, wherein the track forming member is vibrated by an AC voltage applied to the piezoelectric element, and a phase and a height of the AC voltage can be adjusted.

[0007]

1 to 3 show a main part of a vibration part feeder according to a first embodiment of the present invention. In the drawings, parts corresponding to those of the prior art are denoted by the same reference numerals. However, a detailed description thereof will be omitted.

FIG. 1 shows a further part of a substantially circular bowl which is a part of a part feeder, wherein a side wall 1 is substantially perpendicular to a track 2. In practice, the bowl is circular when viewed in plan, but has a downward inclination of several degrees with respect to its radially outward direction. Strictly speaking, the side wall 1 is an arc shape because it corresponds to the outer wall of the bowl, but is shown linearly for easy understanding of the drawing.

A notch 3 is formed in a part of the track 2, and an upright leaf spring 4 is fixed at its lower end to the bottom wall of the notch 3, and its upper end is clearly shown in FIG. Such a rectangular track forming member 5 is fixed. The gap b between the periphery of the track forming member 5 and the track 2 is 1 mm or less.

Next, the theoretical basis of the component alignment means formed as described above will be described. FIG. 4 shows a vibration system of this component alignment means. The track 2 performs torsional vibration in a vibrating part feeder as is well known, and the vibration of the track can be expressed as x ₁ = acosωt. Here, the spring constant of the leaf spring 4 is k, and the viscosity coefficient of this system is c.
And If the mass of the track forming member 5 is m and this displacement is x, the equation of motion is that the relative displacement is xr = x−x ₁

[Table 1] As is clear from the above equation of motion, the equation is equivalent to the equation when the force of Acos (ωt−α) acts on the mass m with the track 2 as the fixed point. Therefore, as is well known, the phase difference between such force and displacement is as shown in FIG. This graph changes depending on the viscosity coefficient c. However, as λ becomes larger, that is, as the resonance point becomes larger than (k / m) ^1/2 , the position between the vibration displacement of the track 2 and the vibration displacement of the track forming member 5 becomes larger. The phase difference is 180 degrees. Accordingly, as shown in FIG. 3, when the track 2 moves to the left in the figure in the gap b , the track forming member 5 moves to the right. When the truck 2 moves to the right, the track forming member 5
Will move to the left.

In the above equation, x ₀ / a represents the ratio of the vibration displacement of the track 2 to the vibration displacement of the track forming member 5. FIG. 6 shows the relationship between this and λ. The relative displacement amplitude ratio decreases as λ increases with λ = 1 as the maximum value. It is apparent from this that γ is set to an appropriate value, for example, 0.7 and the frequency ratio λ is sufficiently large. For example, if it is set to 3 or more, the relative displacement amplitude ratio becomes about 1. Therefore, the track forming member 5 and the track 2 in FIG.
The vibration is performed by changing the phase by 80 degrees, that is, by changing the vibration direction. If the vibration is performed under this condition as described with reference to FIG. 6, the amplitude ratio between the track forming member 5 and the track 2 becomes about 1. That is, if the track 2 vibrates with a stroke of 1 mm, the track forming member 5 also vibrates with a vibration displacement of 1 mm. The frequency of the vibration part feeder has recently been increased by using an inverter, but the higher the frequency, the lower the frequency and the same transfer speed can be produced. Therefore, the amplitude of 1 mm is very large at present, and is set to 0.5 mm or less at an actual frequency. Also, since this is a stroke and a peak-to-peak, if the gap is set to 1 mm even if it is 1 mm, the track forming member 5 and the track 2 do not collide with each other.

The first embodiment of the present invention is configured as described above. Next, this operation will be described.

[0013] Figure 3 is a work i.e. long side of the position shown by the plate-shaped work W but is going to be transferred to the left W ₁ is a plan view which has been transported to this position by the vibration of FIG. 1 Is moved to the next process without reaching the notch 3 of the truck 2. However, the work W ₂ subsequent thereto are transported toward the direction perpendicular to the long side with respect to the transport direction. In this case, the portion indicated by hatching H occupies most of the work, but this surface is in contact with the track surface. On the other hand, the small portion L is transferred while being in contact with the track forming member 3. As is clear from the vibration theory, the contact area between the H plane and the track plane is much larger. Frictional forces are far than the frictional force between the track-forming member 5 and the surface L (positive direction of the vertical acceleration is large) larger so as i.e. counterclockwise as indicated by a dashed line around the workpiece W ₂ is the center of gravity G It is transferred by vibration to the left while receiving a force rotating in the direction. After all is supplied to the next step in the same position as W _1.

FIG. 7 shows a vibration aligning means according to a second embodiment of the present invention. In the drawing, the same reference numerals as those in the above-mentioned conventional example are assigned, and the detailed description thereof will be omitted.

That is, in this embodiment, the piezoelectric element 23 is attached to the leaf spring, and the electrode 2 is further attached to the piezoelectric element 23.
4 is supplied with an AC voltage from the controller 20. This voltage allows the height and phase to be adjusted arbitrarily. The track forming member 22 is supported by the leaf spring 21 in the same manner as described above. In this case, the spring constant 21 is set to be sufficiently high. That is, almost no vibration is excited by the vibration of the track 2. That is, when the AC voltage from the controller 20 is applied to the piezoelectric element 23, the leaf spring 21 is directly bent. This frequency can be adjusted by the controller 20, and in order to obtain the same operation as in the first embodiment, the phase difference with respect to the track surface 2 and the vibration with the same frequency as the frequency of the vibrating parts feeder differ by 180 degrees. I just need.

As described in the first embodiment, the voltage or the phase may be changed to further increase or decrease the rotational movement for changing the posture of the work.

FIG. 8 shows a third embodiment of the present invention. In the figure, portions corresponding to those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, a pair of coil springs 10a and 10b are fixed to the notch wall and the other end is fixed to the track forming member support plate 11 instead of a leaf spring. If the resonance frequency determined by the spring multipliers of the springs 10a and 10b and the masses of the mounting member 11 and the track forming member 12 is set sufficiently lower than the driving frequency of the vibrating parts feeder, the same operation as in the above embodiment can be performed. .

FIGS. 9 and 10 show a case in which another work is used in the first embodiment of the present invention. Corresponding components are denoted by the same reference numerals, and a detailed description thereof will be omitted.

That is, in the present embodiment, an opening h is formed in one half of the same shape instead of the flat work W. When such a work W ′ is transferred to the left by vibration in FIG. 9, if the opening h is in contact with the side wall, the contact area is reduced by the opening h and the frictional force is reduced. The forming member becomes larger and turns clockwise in this case. Therefore, the transfer can be performed with the opening h at the rear end side. Further, in FIG.
Is located on the track forming member side and is transported. In this case, the contact area H which is about half of the side contacting the side wall portion 1 is larger, and in this case, as in the above embodiment, It rotates in the counterclockwise direction, and is also phased by vibration with the opening h located rearward and the longitudinal direction facing the transport direction. The work Wa 'transported with the opening h forward and the longitudinal direction in the transport direction is fixed to the bottom wall of the notch 2b (omitted in FIG. 10 or located further upstream). The leaf spring 31 (indicated by the dotted line) is in a direction of about 45 degrees (with respect to the transport direction). The track forming member 30 is fixed to this upper end. The vibration of the plate spring may be inverted by 180 degrees in the same manner as in the above-described embodiment, and may be oscillated. The height and frequency of the applied voltage are adjusted so that when the rear end of the work Wa 'passes over it, the frictional force of this portion is made larger than that of the front end side where the hole is opened, and the direction of the leaf spring is increased. (45 °) to transfer the parts. By this, this work Wa '
Is rotated counterclockwise about the center of gravity G, and the above-described longitudinal direction is oriented perpendicular to the transport direction. And supplied to the next step.

FIGS. 11 and 12 show a fourth embodiment of the present invention. In the drawings, parts corresponding to those in the above-described embodiment are designated by the same reference numerals, and a detailed description thereof will be omitted.

That is, in this embodiment, one end of the work is triangular and the other end is square. A work in which such a work is in the posture of Wa, that is, with its triangular portion forward and its longitudinal direction directed in the transfer direction, is transferred to the downstream side by vibration as it is, but the work whose longitudinal direction is directed perpendicular to the transfer direction. When Wb reaches the track forming member 40, it rotates in the counterclockwise direction under the same operation as in the above embodiment, and assumes a posture opposite to the work Wa.
In addition, since the attitude | position which makes a triangle part abut on the side wall part 1 is unstable, such an attitude | position cannot be taken and the attitude | position of Wa or Wc is taken. Work with Wc posture is W
In the present embodiment, a step D is provided on the downstream side, and the workpiece in the posture of Wa is moved in the longitudinal direction before the center of gravity G reaches the step D in the present embodiment. Most of the work is transported above the track surface at the lower level, so that it is supplied to the next process in the same posture. However, the work in the posture of Wc is deviated by its center of gravity G being biased forward with respect to the longitudinal direction. When it passes through the step D, it receives clockwise turning power in FIG.
It can be rotated counterclockwise and supplied to the next process in the posture of Wa. The present invention may thus be used in combination with conventional component alignment means. In any case, the sorting efficiency can be set to 100%, and parts or workpieces can be supplied to the next process.

Although the embodiment of the present invention has been described above, the present invention is, of course, not limited to this, and various modifications can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, a vibrating parts feeder is described. In this case, the bowl is vibrated and transferred with a downward inclination of several degrees in a radially outward direction with respect to the track surface (linear torsional vibration). It is apparent that this can be applied even if the vibration angle is further reduced in place of the elliptical vibration.

The present invention is also applicable to a linear vibration feeder having a linear trough instead of the vibration parts feeder. Further, the present invention is applicable to a so-called slide conveyor in which the forward movement vibrates at a small acceleration and the backward movement vibrates at a large acceleration.

[0026]

As described above, according to the vibration aligning apparatus of the present invention, the sorting efficiency can be set to 100% and parts can be efficiently supplied to the next step. Also, since the work (parts) is not transferred over the same stroke many times as compared with the case where the different posture is eliminated inside the bowl, the friction with the track surface can be minimized and the work can be protected. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a vibrating parts feeder according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the same operation.

FIG. 3 is a plan view showing the same operation.

FIG. 4 is a schematic diagram showing a theoretical basis of the present embodiment.

FIG. 5 is a chart showing a phase difference relationship between a force and a displacement of the vibration system.

FIG. 6 is a graph showing a relationship between a relative vibration ratio of a vibration displacement of a track of the vibration system and a vibration displacement of a track forming member, and a relation of driving angular frequency / vibration resonance angular frequency = λ.

FIG. 7 is a cross-sectional view of a vibration alignment unit according to a second embodiment of the present invention.

FIG. 8 is a sectional view of a vibration alignment unit according to a third embodiment of the present invention.

FIG. 9 shows a case where another work is applied to the first embodiment of the present invention.

FIG. 10 is a plan view similarly showing the operation.

FIG. 11 is a plan view showing a fourth embodiment of the present invention.

FIG. 12 is an enlarged cross-sectional view of a downstream-side alignment unit in the embodiment.

FIG. 13 is a plan view of a conventional vibration aligning means.

[Explanation of symbols]

 2 Track surface 3 Notch 4 Leaf spring 5 Track forming member

Continuing on the front page (72) Inventor Tetsuyuki Kimura 100 Takegahana-cho, Ise-shi, Mie Prefecture Shinko Electric Co., Ltd. Ise Works Co., Ltd. Reference) 3F037 BA01 CA01 CB03 3F080 AA19 BC01 CB02 CB11 CB16 DA09

Claims (3)

[Claims] 1. A vibration aligning apparatus in which a track is vibrated to transfer a part on the track in a predetermined direction, and the part is arranged in a predetermined posture by a part aligning means and supplied to a next process. The means has a notch formed in a part of the track, and the track forming member is supported by a spring so as to be able to vibrate in the notch so as to be flush with the track, and a spring constant of the spring and the track forming member are provided. The resonance frequency determined by the mass of the track is smaller than the frequency of the track, and the phase of the track
A vibration alignment device wherein the track forming member is caused to vibrate at staggered phases. 2. The vibration aligning device according to claim 1, wherein the spring is a leaf spring. 3. The vibration aligning apparatus according to claim 1, wherein the component is moved in a predetermined direction by vibrating the truck, and the component is arranged in a predetermined posture by component alignment means and supplied to the next man-hour. The means forms a notch in a part of the track, and supports the track forming member by a leaf spring so as to be able to vibrate within the notch so as to be flush with the track, and attaches a piezoelectric element to the leaf spring. A vibration alignment device, wherein the track forming member is vibrated by an AC voltage applied to the piezoelectric element, and a phase and a height of the AC voltage can be adjusted.