JP6817513B2 - Work transfer device - Google Patents

Description

The present invention relates to a work transfer device that conveys a work by a traveling wave.

Conventionally, a bowl feeder that can accommodate workpieces, a main linear feeder that transports workpieces supplied from the bowl feeder while aligning them, and a linear feeder for return that returns the workpiece removed from the main linear feeder to the bowl feeder. A parts feeder having the above is known (for example, Patent Document 1). Further, there is known a parts feeder in which a work is circulated by two linear feeders and a bowl feeder is unnecessary (for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2003-20601 Japanese Unexamined Patent Publication No. 2000-289831

By the way, in recent years, the speed of the work in the linear feeder has been increasing, and in order to increase the transfer speed of the work in the configuration disclosed in Patent Documents 1 and 2, it is conceivable to increase the amplitude of the linear feeder. However, when the amplitude of the linear feeder is increased, the horizontal amplitude of the tip of the linear feeder is increased. Therefore, it is necessary to widen the gap between the interface portion provided at the tip of the linear feeder and the next process equipment. Coupled with the progress of miniaturization, there is a possibility that the work may fall between the next process equipment and the interface portion of the linear feeder, or the work may be clogged.

Therefore, it is conceivable to increase the transport speed by increasing the frequency of the drive unit of the linear feeder that is vibrated by the resonance of the leaf spring and reducing the displacement amplitude. However, if the frequency of the drive unit, which is generally about 300 Hz, is raised further, the frequency approaches 1 kHz to 4 kHz, which is highly sensitive to the human ear, and noise becomes louder, which may cause a problem. Further, in the structure of resonating with a leaf spring, when the frequency exceeds 300 Hz and exceeds 1 kHz, the transport path or the like is elastically deformed and the work cannot be normally transported (it is difficult to uniformly vibrate the transport path (chute) in parallel). become).

An object of the present invention is to effectively solve such a problem, and to provide a work transfer device capable of transporting a miniaturized work to a next process device at high speed without increasing noise. The purpose is.

In view of the above problems, the present invention has taken the following measures.

That is, the work transfer device according to the first aspect of the present invention has a work transfer surface, and a portion where the work transfer surface is provided and a fixed portion are formed from a portion where the fixed portion and the work transfer surface are provided. It also has a configuration in which it is connected by a low-rigidity portion with low rigidity, and a transport path on which the work can be placed without restricting its position on the work transport surface, and at least a part thereof is used as the work transport surface. The elastic body is provided with a traveling wave generating means for generating a traveling wave that circulates, and the traveling wave generated by the traveling wave generating means is configured to transport the work on the work transport surface. By superimposing two spatially and temporally staggered waves formed by vibrating different positions, the traveling traveling wave is formed so that the traveling wave is formed. It is characterized in that the work is conveyed in a direction opposite to the traveling direction of the traveling wave by the frictional force generated between the work and the work conveying surface by being formed.
Further, the work transfer device according to the second aspect of the present invention has a work transfer surface, and has a transfer path on which the work can be placed without restricting the position on the work transfer surface, and at least a part thereof is described above. The elastic body used as the work transport surface is provided with a traveling wave generating means for generating a traveling wave that circulates, and the work on the work transport surface is transported by the traveling wave generated by the traveling wave generating means. In the transport path, a fixed portion to which the pressing member is fixed is formed in the center thereof, and the thickness of the transport path is lower than that of the portion where the fixed portion and the work transport surface are provided in the peripheral portion of the fixed portion. It is characterized in that the work transport surface is formed through a rigid portion.

Here, the traveling wave may be generated in a substantially planar shape. However, the substantially flat surface referred to here includes a step formed by the thickness of the work.

With such a configuration, the traveling wave generating means can generate the traveling wave by generating at least a part of the traveling wave on the elastic body used as the work transport surface and transport the work, so that the traveling wave is generated especially by ultrasonic vibration. With the configuration, the horizontal amplitude of the work transfer surface becomes close to 0, and the transfer path and the next process device can be brought close to each other. Therefore, even if the work is fine, the transfer path and the next process device can be separated from each other. It is possible to prevent the work from falling or clogging. Further, even if the frequency of the traveling wave is increased, the noise does not increase as in the conventional configuration using the resonance of the leaf spring, and the traveling wave can transfer the work on the work transfer surface at high speed.
In particular, according to the configuration according to the second aspect, a traveling wave can be appropriately generated on the work transport surface.

In particular, in the configuration according to the first aspect, the elastic body has a track shape including a pair of straight portions and a curved portion connecting them, and by vibrating each of the pair of straight portions, the two waves are generated. It is also preferable that it is formed.
Further, as a configuration that enables appropriate use as a work transfer device, the transfer path may have a discharge unit for discharging the work on the work transfer surface.

In particular, in a configuration in which a work in a different direction can be returned to a bowl feeder or the like, in order to suppress an increase in the number of bowl parts and costs, the work transfer surface is provided with one end side to the other end of the transfer path. It is preferable that the work transport portion for transporting the work toward the side and the work return portion for returning the work on the other end side of the transport path to the one end side are formed.

Further, in order to convey the workpieces while aligning them and appropriately handle defective workpieces such as workpieces in different directions, the conveying path includes an alignment region in which the workpieces are brought to one side in the width direction of the workpiece conveying portion. It is preferable that the configuration is located lower than the alignment region and has a defective work transport region that receives the work dropped from the alignment region and returns it to one end side of the transport path.

In addition, the horizontal amplitude generated on the work transfer surface by the traveling wave is increased within the range where an appropriate distance can be maintained between the transfer path and the next process device, and even if the work is fine, it is difficult to jump on the work transfer surface. In order to do so, it is preferable that the work transport surface has a plurality of slits extending in the width direction formed along the circumferential direction.

Further, in order to achieve high speed while preventing the noise from becoming loud, it is preferable that the traveling wave generating means is configured to generate a traveling wave by ultrasonic vibration.

As described above, according to the present invention described, by particular generating by RiSusumu line wave in the ultrasonic vibration, the work transfer surface in proximity to the next process device, a work is a fine, a conveying path following It is possible to provide a work transfer device capable of suppressing dropping or clogging between the process device and the process device and transporting the work on the work transfer surface at high speed without increasing noise.

The perspective view which shows the parts feeder which concerns on one Embodiment of this invention. Top view of the parts feeder. FIG. 5 is a cross-sectional view showing the linear feeder shown in FIG. 1 cut along the cutting plane line AA. Schematic bottom view of the transport path provided in the linear feeder. The figure for demonstrating the traveling wave generated in the same transport path. The figure for demonstrating the traveling wave generated in the same transport path. The figure for explaining the traveling wave. The perspective view which shows the modification of this invention. FIG. 8 is a cross-sectional view showing a modified example shown in FIG. 8 cut along the cutting surface line BB. Schematic cross-sectional view showing another modification of the present invention. The figure which shows still another modification of this invention. The figure for demonstrating the traveling wave generated by the structure of the modification shown in FIG. The figure which shows still another modification of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the parts feeder 100 as a work transfer device according to an embodiment of the present invention includes a bowl feeder 1 for supplying a work and a linear feeder 2 connected to the bowl feeder 1.

The bowl feeder 1 includes a bowl body 10 capable of accommodating the work W, and a bowl driving means 11 arranged below the bowl body 10 and vibrating the bowl body 10 by torsional vibration.

The bowl body 10 is a substantially inverted conical member having an open upper portion, and a bowl transport path 12 that rises spirally is formed on the inner peripheral wall thereof. When the bowl body 10 vibrates in the twisting direction by the bowl driving means 11, the work W is conveyed upward along the bowl conveying path 12 toward the linear feeder 2.

The linear feeder 2 has an elliptical transport path 20 in which one end 20a1 is connected to the terminal portion 12a of the bowl transport path 12 and a track-shaped work transport surface 24 is formed, and ultrasonic waves are formed on the work transport surface 24. It has a piezoelectric element 21 (see FIG. 3) that generates a traveling wave by vibration, a support base 22 that supports the transport path 20 from below, and a sorting section 23 installed on the other end 20a2 side of the transport path 20.

The transport path 20 has a substantially symmetrical shape on the left and right sides, and has an oval recess 20a in the center. The recess 20a contains an oval-shaped pressing plate 20b that is one size smaller than the recess 20a, and the pressing plate 20b is provided by a plurality of fasteners 20e arranged in the longitudinal direction via a washer 20d shown in FIG. It is fixed to the center of the bottom surface 20aa of the recess 20a. As a result, as shown in FIG. 3, in the bottom portion 20aa of the recess 20a, the fixed portion 20g and the fixing portion 20g are thinner than the other portions at the position between the fixed portion 20g to which the holding plate 20b is fixed and the work transfer surface 24. A low-rigidity portion 20c having a rigidity smaller than that of the work transfer surface 24 is formed. Further, a portion that is a peripheral portion of the recess 20a and the center of the transport path 20 is pressed by the pressing plate 20b and is raised is used as the work transport surface 24. In this way, the high-rigidity fixed portion 20g and the work transfer surface 24 are connected by the low-rigidity portion 20c, so that when a traveling wave described later is generated, the outer peripheral side and the inner peripheral side of the work transfer surface 24 are generated. Since the amplitude difference between the two can be reduced and the work transport surface 24 can be prevented from being deformed in the entire width direction, the diagonal transport of the work W on the work transport surface 24 can be reduced. A low-rigidity portion 20c may be formed in the transport path 20 by forming a slit instead of the recess 20a.

Further, the transport path 20 is provided on the one end portion 20a1 side and is provided on the approach portion 24a2 connected to the end portion 12a of the bowl transport path 12 and the other end portion 20a2 side, and the work W on which the work transport surface 24 is transported is provided. It has a discharge unit (discharge truck) 24a3 that discharges at least a part of the above toward the next step (not shown).

The work transport surface 24 includes a work transport portion (upward transport surface) 24a that extends linearly between the approach portion 24a2 and the discharge portion 24a3, and a curved return region 24b1 that curves while projecting outward from the vicinity of the discharge portion 24a3. A work return portion (downward side transport surface, work discharge track) 24b having a linear return region 24b2 extending linearly from the curved return region 24b1 to one end portion 20a1 side is formed. The end of the straight return region 24b2 is located above the bowl body 10, and the work W carrying the straight return region 24b2 can be dropped into the bowl body 10.

Such a work transport surface 24 has a substantially flat shape, that is, a substantially horizontal plane shape as a whole, and is open at the upper side, so that the work W can be placed without restricting the position on the surface. An ultrasonic motor has been conventionally known to generate a traveling wave by ultrasonic vibration, but in an ultrasonic motor, the rotor rotates while being pressed against the stator in a state where the relative position with respect to the stator is regulated. Yes, the configuration is completely different from the parts feeder 100 of the present embodiment. Further, the work transport surface 24 is an elastic body capable of generating at least two or more vertical deflection waves in the work transport portion 24a or the work return portion 24b by ultrasonic vibration of 20 kHz or more.

As shown in FIG. 3, the piezoelectric element 21 as the traveling wave generating means is attached to the back side of the portion where the work transport surface 24 is formed in the transport path 20. The piezoelectric element 21 expands and contracts in the longitudinal direction of the transport path 20 to generate deflection in the work transport surface 24, and a plurality of piezoelectric elements 21 are provided in the work transport portion 24a and the linear return region 24b2 along the longitudinal direction (the present embodiment). Then 4 each) will be provided. As shown in FIG. 4, the plurality of piezoelectric elements 21 are connected to the amplifier 21a and are attached to the antinode positions of the vibration mode at the work transport portion 24a and the linear return region 24b2 at intervals of 1/2 wavelength, respectively, and the polarities are adjusted. It has been replaced alternately. In addition, two deflection standing wave modes (0 ° standing wave mode shown in FIG. 5A and 90 ° shown in FIG. 5B) are spatially out of phase with each other by 90 ° while maintaining the same frequency. In order to efficiently vibrate in (mode), (n + 1/4) λ (n =) between the piezoelectric element 21 of the work transport portion 24a and the piezoelectric element 21 of the linear return region 24b2 along the transport direction of the work transport surface 24. There is a gap of 0 or an integer), and both piezoelectric elements 21 are attached so as to be substantially shifted by 1/4 wavelength. A standing wave simply vibrates up and down on the spot when it resonates. Further, the piezoelectric element 21 may be integrated, and the polarities of the electrodes on the surface may be alternately exchanged, or the polarities may be opposite. Further, the piezoelectric element 21 may be provided one by one in the work transport portion 24a and the straight return region 24b2, or may be provided only in either the work transport portion 24a or the straight return region 24b2. You may. Further, the piezoelectric element 21 may be attached to the front and back surfaces of the work transport surface 24, respectively. That is, two or more piezoelectric elements 21 may be provided anywhere on the work transfer surface 24 as long as the above-mentioned mounting conditions are satisfied.

In such a configuration, the piezoelectric element 21 of the work transport portion 24a and the piezoelectric element 21 of the work return portion 24b provide sinusoidal vibration of ultrasonic waves with a phase shift of 90 ° in time via the phase adjusting portion 21b. Then, two standing waves that are spatially and temporally displaced by 90 ° are superposed, the work transfer surface 24 itself resonates and elastically deforms, and the deflection vibration becomes a traveling wave (circulation method). At one point Z of the work transport surface 24 where the traveling wave is generated, elliptical vibration occurs from the starting point t = 0 to t = 3/4 T as shown in FIG. Further, due to the traveling wave generated on the work transport surface 24, a force acts on the work W at one point Z at the apex of the wave, and a frictional force e is generated between the work W and the work transport surface 24, so that the elliptical vibration occurs. The work W is conveyed in the direction opposite to the traveling direction (arrow d in FIG. 7) (arrow c shown in FIG. 7) by the propulsive force of the horizontal component (horizontal amplitude) of. By circulating such a traveling wave of the deflection wave on the work transport surface 24, the work W is orbitally transported on the work transport surface 24 in an oval shape. Since only the work transport surface 24 is flexed and vibrated in this way, even if the central portion of the transport path 20 is fixed as described above, the bending vibration mode of the work transport surface 24 is not affected, and a traveling wave can be obtained. By inverting the phase difference of the sine wave given to the piezoelectric element 21 of the work transport portion 24a and the piezoelectric element 21 of the work return portion 24b (time phase is inverted (−90 °)), the opposite direction is obtained. The work W can be conveyed to the machine W, and when the work W is clogged, the work W can be temporarily fed back to clear the clog.

Returning to FIG. 1, the work W is dropped by centrifugal force at both ends in the width direction of the work transport portion 24a, the curved return region 24b1, the straight return region 24b2, the approach portion 24a2, and the discharge portion 24a3, and from the straight return region 24b2. A guide 25 is provided to prevent the work W from entering the work transport portion 24a.

Further, the sorting unit 23 is provided on the upstream side in the transport direction from the curved return region (curve) 24b1 provided at the other end portion 20a2, and is used for posture determination and air based on the result of the attitude determination. It has an air ejection portion 23b for ejecting the air. By ejecting air from the air ejecting portion 23b, the work W determined to be in a different direction can be pushed out from the work conveying portion 24a to the work returning portion 24b and removed from the conveying portion 24a.

In such a parts feeder 100, the work W supplied from the bowl feeder 1 is linearly conveyed in the direction of the arrow x in the work conveying portion 24a, and is conveyed to the sorting portion 23 arranged in front of the curved return region 24b1. To reach. The work W determined to be in the positive direction by the posture determination using the sensor 23a advances straight as it is due to the inertial force, is transferred to the discharge unit 24a3, and is supplied to the next process. On the other hand, the path of the work W determined to be in a different direction is changed by the air ejected from the air ejection portion 23b, and proceeds in the direction of the arrow y via the work return portion (return trough) 24b, and the bowl feeder 1 Returned to. Therefore, the work W determined to be in the forward direction advances through the transport portion 24a and is delivered to the next process by the discharge portion 24a3, while the work W determined to be in the different direction conveys the work return portion 24b and is delivered to the bowl feeder 1. It is returned to the inside of the bowl body 10.

As described above, the parts feeder 100 of the present embodiment has a track-shaped work transport surface 24, and has a transport path 20 capable of transporting the work W without restricting its position on the work transport surface 24, and a work transport surface. A piezoelectric element 21 is provided on the surface 24 as a traveling wave generating means for generating a traveling wave that orbits in a substantially planar shape, and the work W on the work transport surface 24 is conveyed by the traveling wave generated by the piezoelectric element 21. It is composed.

With such a configuration, the piezoelectric element 21 can generate a traveling wave on the track-shaped work transport surface 24 to transport the work W. Therefore, particularly when the configuration is such that the traveling wave is generated by ultrasonic vibration, the work is transported. Since the horizontal amplitude of the surface 24 becomes close to 0 and the discharging portion 24a3 connected to the work transfer surface 24 can be brought close to the next process device, the transfer path 20 and the next process device can be brought close to the work W even if the work W is fine. It is possible to prevent the work W from falling or becoming clogged between the two. Further, even if the frequency of the traveling wave is increased, the traveling wave generated in a substantially planar shape does not increase the noise as in the conventional configuration using the resonance of the leaf spring, and the work W is formed on the work transport surface 24. Can be transported at high speed. Further, by reversing the direction in which the traveling wave travels, the work W can be conveyed in the opposite direction. Therefore, when the work W is clogged on the work transfer surface 24, the work W is temporarily out of phase. It can be made to clear the clogging.

Further, since the transport path 20 has a discharge unit 24a3 for discharging the work W on the work transport surface 24, it can be appropriately used as the work transport device 100.

Here, like the parts feeder disclosed in Patent Documents 1 and 2, it is assumed that the configuration has a main linear feeder and a return linear feeder for returning the work excluded from the main linear feeder to the bowl feeder. Since the two linear feeders are set in opposite directions, it is necessary to adjust the position of the troughs so that the troughs do not interfere with each other, and it is considered that the adjustment takes a long time. In addition, each linear feeder requires a drive unit and a controller that vibrate the work transfer surface, which leads to an increase in cost.

Therefore, as in the present embodiment, the work transport portion 24a that transports the work W from the one end portion 20a1 side of the transport path 20 toward the other end portion 20a2 side and the other end portion of the transport path 20 are conveyed to the work transport surface 24. By forming the work return portion 24b that returns the work W on the 20a2 side to the one end portion 20a1 side, one side of the work transport surface 24 having an oval shape can be used as a return trough, so that the excluded parts are circulated. Therefore, it is not necessary to prepare another linear feeder or return trough, the transport path 20 can be easily installed, and an increase in the number of parts and costs can be suppressed.

In particular, since the guides 25 are provided at both ends in the width direction of the discharge portion 24a3 and both ends in the width direction of the work return portion 24b, the work W is prevented from falling around the part feeder 100, and the work W is moved. Can be transported properly.

Further, the transport path 20 has a fixed portion 20 g formed in the center thereof by a pressing plate 20b which is a pressing member, and the fixed portion 20 g and the work transport surface 24 are thinner than the fixed portion 20 g and the work transport surface 24 in the peripheral portion of the fixed portion 20 g. Since the work transfer surface 24 is formed through the low-rigidity portion 20c of the above, the fixed portion 20 g can be used as a scaffolding appropriately without causing unnecessary deflection in the track-shaped work transfer surface 24. A traveling wave can be generated.

In particular, since the piezoelectric element 21 is configured to generate a traveling wave by ultrasonic vibration, the driving sound cannot be heard by the human ear, can be silenced, and high speed is achieved while preventing the noise from becoming loud. it can.

Although one embodiment of the present invention has been described above, the specific configuration of each part is not limited to the above-described embodiment.

For example, in the present embodiment, the entire work transport surface 24 is on the same plane, but as in the parts feeder 101 shown in FIGS. 8 and 9, the work W is brought closer to one end 31 a in the width direction of the work transport portion 24a. An alignment trough portion 31 as an alignment region and a circuit course portion 32 as a defective work transfer region located at a position lower than the alignment trough portion 31 may be provided. The alignment trough portion 31 is formed so as to extend downward over the approach portion 24a2', the work transport portion 24a, and the discharge portion 24a3' at a position higher than the work transport surface 24 toward the guide 25 on the one end portion 31a side. To. As a result, as shown in FIG. 9, the work W is conveyed while being in contact with the guide 25 by the one end portion 31a side due to the inclination of the alignment trough portion 31, so that the work W is aligned in a row and supplied to the next process apparatus. be able to. The circuit course portion 32 is composed of a portion other than the alignment trough portion 31 of the work transport portion 24a and a work return portion 24b.

In this configuration, the work W is supplied from the bowl transport path 12 of the bowl feeder 1 to the alignment trough portion 31, and is provided at the central portion in the longitudinal direction of the work transport portion 24a with respect to the work W that conveys the alignment trough portion 31. Posture determination is performed using the sensor 23a of the sorting unit 23. The work W determined to be in a different direction is dropped from the alignment trough portion 31 to the circuit course portion 32 by the air from the air ejection portion 23b. The work W in the different direction excluded from the lap course 51 is returned to the bowl body 10 of the bowl feeder 1 via the work return portion 24b. The work W determined to be in the positive direction advances the alignment trough portion 31 toward the other end portion 20a2 and is discharged from the discharge portion 24a3'. In the approach portion 24a2'and the discharge portion 24a3', the guide 25 is provided only on the one end portion 31a side in the width direction. Further, in this modification, as shown in FIG. 9, the low-rigidity portion 20c between the work transport surface 24 and the fixed portion 20g is made thinner than in the above-described embodiment to reduce the rigidity. As a result, the difference in deflection amplitude in the vertical direction between the outside and the inside in the width direction of the work transport surface 24 becomes smaller, and the work W can be more stably reduced.

As described above, the transport path 30 is located at a position lower than the alignment trough portion 31 as an alignment region for bringing the work W closer to the one end portion 31a side, which is one side in the width direction of the work transport portion 24a, and the alignment trough portion 31. Since it has a circuit course portion 32 as a defective work transport region that receives the work W dropped from the alignment trough portion 31 and returns it to the one end portion 20a1 side of the transport path 30, the workpieces can be transported while being aligned in a row. The work W in the different direction can be properly returned to the bowl feeder 1. Further, the sorting unit 23 can be installed not only in front of the curved return region 24b1 but also at a plurality of locations of the work transporting unit 24a, and the posture discrimination process can be performed a plurality of times, so that the sorting efficiency can be improved.

The straight return region portion 24b2 may be inclined uphill, and the work W carrying the straight return region portion 24b2 may be directly returned to the start end portion of the alignment trough portion 31. This eliminates the need for the bowl feeder 1. In addition to this, the work W can be dropped from the alignment trough portion 31 to the circuit course portion 32 while rotating, so that the posture of the work W can be changed. Further, the alignment trough portion 31 may be inclined downward to increase the transport speed. Further, as shown in FIG. 10, the entire work transport portion 24a is used as the aligned trough portion 31, and the aligned trough portion 31 is hung so as to pass over the pressing plate 20b from the position near the air ejection portion 23b to the circuit course portion 32. The transfer member 35 may be bridged with a downward inclination, and the work W determined to be in a different direction may be blown from the alignment trough portion 31 onto the transit member 35 by air and directly transferred to the circuit course portion 32. As a result, it is not necessary to pass the curved return portion 24b1, and the transfer of the work W to the work return portion 24b can be shortcut.

Further, as shown in FIG. 11, a plurality of slits 8 extending in the width direction thereof may be formed on the work transport surface 24'along the circumferential direction. In the above embodiment in which the slit 8 is not formed on the work transport surface 24, the neutral axis N is located at the center of the transport path 20 in the thickness direction (see FIG. 6), but the slit 8 is formed on the work transport surface 24'. Since the neutral axis N is lowered, the horizontal component (horizontal amplitude) generated on the work transfer surface 24'due to the traveling wave can be maintained at an appropriate distance between the transfer path 20'and the next process apparatus, as shown in FIG. The range can be increased, and the horizontal propulsive force applied to the work W can be increased to make it difficult for the work W to jump on the work transport surface 24'. In such a configuration, a film (not shown) may be attached to the work transport surface 24'to prevent the work W from falling into the slit 8.

Further, in the above embodiment, the traveling wave is generated by the traveling method, but the present invention is not limited to this, and for example, as shown in FIG. 13, both ends 20a1 and 20a2 of the work transport surface 24 are vibrated with different phase differences. A traveling wave may be generated by a conventionally known vibration method at both ends.

Further, in the above embodiment, substantially the entire work transport surface 24, 24'is used for transporting or returning the work W, but only one side of the work transport surface 24, 24'is used for transporting the work W. It may be configured to be.

Further, the shapes of the transport paths 20 and 30 are not limited to the oval shape in a plan view, and may be a rectangular shape in a plan view.

Other configurations can be modified in various ways without departing from the spirit of the present invention.

8 ... Slits 20, 30 ... Transport path 20a1 ... One end of the transport path 20a2 ... The other end of the transport path 20b ... Holding plate (holding member)
20c ・ ・ ・ Low rigidity part 20g ・ ・ ・ Fixed part 21 ・ ・ ・ Piezoelectric element (traveling wave generating means)
24, 24'... Work transfer surface 24a ... Work transfer section 24a3, 24a3'... Discharge section 24b ... Work return section 25 ... Guide 31 ... Alignment trough section (alignment area)
31a: One end side (one side) of the work transfer part
32 ... Circular course part (defective work transfer area)
100, 101 ... Parts feeder (work transfer device)
W ... work

Claims (8)

It has a structure in which a portion having a work transfer surface and the work transfer surface is provided and a fixed portion are connected by a low-rigidity portion having a lower rigidity than the fixed portion and the portion provided with the work transfer surface. a transport path capable of placing the workpiece without restricting the position on the workpiece conveying surface,
An elastic body whose at least a part is used as the work transport surface is provided with a traveling wave generating means for generating a traveling wave that orbits.
The work on the work transfer surface is configured to be conveyed by the traveling wave generated by the traveling wave generating means.
The orbiting traveling wave is formed by superimposing two spatially and temporally deviated waves formed by vibrating different positions on the elastic body.
Due to the frictional force generated between the work and the work transport surface due to the formation of the traveling wave, the work is transported in the direction opposite to the traveling direction of the traveling wave.
A work transfer device characterized by this. The elastic body has a track shape including a pair of straight portions and a curved portion connecting them.
The two waves are formed by vibrating each of the pair of straight lines.
The work transfer device according to claim 1, wherein the work transfer device is characterized in that. A transport path that has a work transport surface and allows the work to be placed without restricting its position on the work transport surface.
An elastic body whose at least a part is used as the work transport surface is provided with a traveling wave generating means for generating a traveling wave that orbits.
The work on the work transfer surface is configured to be conveyed by the traveling wave generated by the traveling wave generating means.
In the transport path, a fixed portion to which the pressing member is fixed is formed in the center thereof, and a low-rigidity portion thinner than the portion provided with the fixed portion and the work transport surface is formed in the peripheral portion of the fixed portion. The work transfer surface is formed through the structure.
A work transfer device characterized by this. The work transfer device according to any one of claims 1 to 3, wherein the transfer path has a discharge unit for discharging a work on the work transfer surface. A work transport portion that transports the work from one end side to the other end side of the transport path to the work transport surface, and a work return that returns the work on the other end side of the transport path to the one end side. The work transfer device according to claim 4, wherein a portion is formed. The transport path is located at a position lower than the alignment region and the alignment region where the work is brought to one side in the width direction of the work transport portion, and one end portion of the transport path receives the work dropped from the alignment region. The work transfer device according to claim 5, further comprising a defective work transfer area to be returned to the side. The work transfer device according to any one of claims 1 to 6, wherein a plurality of slits extending in the width direction are formed on the work transfer surface along the circumferential direction. The work transfer device according to any one of claims 1 to 7, wherein the traveling wave generating means is configured to generate a traveling wave by ultrasonic vibration.