JPS6317724B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vibrating parts feeder.

Generally, a vibrating parts feeder is also called a parts feeder, and has a structure as shown in FIGS. 1 and 2. In the figure, a component receptacle 1 (hereinafter referred to as a ball) has a nearly oval shape, and a spiral track 2 is formed on its inner peripheral wall surface. A movable base 3 is fixed to the bottom surface of the ball 1, and four leaf spring mounting portions 4 are integrally formed around the movable base 3 at equal angular intervals. A drive unit mounting base 5 is disposed below the movable base 3, and four leaf spring mounting blocks 6 are fixed to the upper surface thereof at equal angular intervals with bolts 19. The upper and lower ends of the leaf spring 7 are stacked on the slope 4a of the leaf spring mounting portion 4 and the slope 6a of the leaf spring mounting block 6, respectively, with bolts 11a and 11b.
Fixed by Spacer 8 between leaf springs 7
a and 8b are interposed. At the upper end, a seat plate 9a and a washer 10a are further interposed, and the stacked leaf spring 7 is fixed to the leaf spring mounting portion 4 by inserting a bolt 11a into these holes and screwing and tightening a nut 12. . At the lower end, there is a seat plate 9.
b. The stacked leaf spring 7 is attached to the leaf spring mounting block 6 by inserting the bolts 11b through these holes with the washers 10b interposed, and screwing and tightening them into the screw holes formed in the leaf spring mounting block 6. It is fixed to the drive unit mounting base 5.

As described above, the stacked leaf spring 7 is arranged at a predetermined inclination angle, for example, about 20 degrees with respect to the vertical direction, and connects the movable base 3 and the drive unit mounting base 5 so as to be able to torsionally vibrate. The connection point between the upper end of the stacked leaf spring 7 and the movable base 3 by the bolt 11a, and the connection point between the lower end of the stacked leaf spring 7 and the drive unit mounting base 5 are shown in FIG. 3 when viewed in plan. As shown conceptually in Figure 2, the two circles are on the circumference A and the circumference B centered on point 0.

Further, a movable core 13 is fixed to the bottom surface of the movable base 4, and an electromagnet 14 is connected to the movable core 13 via a mounting member 16 to tighten a height adjustment bolt 17 and a nut 18.
It is fixed to the drive unit mounting base 5 by. The electromagnet 14 has a coil 15 wound around it. The entire parts feeder is supported on the floor by vibration isolating rubber 20.
In addition, in FIG. 2, a screw hole 3a for fixing the ball 1 is formed in the center of the movable table 3.

As described above, the entire drive unit consisting of the electromagnet 14, coil 15, leaf spring 7, etc. is mounted on the drive unit mounting base 5.
It is covered with a cover 21 fixed to the protrusion 5a integrally formed with the protrusion 5a.

The conventional parts feeder is constructed as described above, but when an alternating current is applied to the coil 15 of the electromagnet 14, an attractive force that changes sinusoidally in the vertical direction is generated.
As a result, the movable base 3, ie, the ball 1, performs a known torsional vibration a. At this time, the drive unit mounting base 5 also undergoes torsional vibration b, but its amplitude is much smaller. At this time, as shown in FIG. 4, the upper end of the leaf spring 7 performs a twisting motion around the node n along the line c--c. The lower end also undergoes a twisting movement around node n along line dd. In FIG. 4, the motion of the leaf spring 7 is exaggerated as shown by a solid line, a dashed-dotted line, and a dashed-double-dotted line.
(Only one sheet is shown for clarity) Due to the torsional movement of the plate spring 7, the upper end of the leaf spring 7 and the movable base 3
At the connection point between the leaf spring 7 and the drive unit mounting base 5, and between the leaf spring 7 and the spacers 8a and 8b, and between the leaf spring 7 and the seat plates 9a and 9b, relative slippage is prevented. A large force is applied that causes the However, in reality, it is not possible to obtain a tightening force strong enough to prevent such slippage from occurring with the bolts 11a and 11b, so that eventually slippage occurs between them. This amount of slip tends to increase with operating time, and therefore the natural frequency of the vibration system changes. Experimentally, after about 1 hour to about 2 hours of continuous operation, the swing width a of the ball 1 decreases by δ as shown in FIG. This magnitude is approximately 10%, but can vary by as much as 20% to 30% in some cases.
The speed at which the parts are transported on the track 2 of the ball 1 is approximately proportional to the swing width, but this does not provide a constant speed at which the parts are transported.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a vibrating component feeder in which the swing width of the ball hardly changes during continuous operation. According to the invention, this object is achieved by providing a component receiver having a spiral component transfer track, a movable platform fixed to the bottom of the component receiver, and a movable platform disposed below the movable platform for performing vertical processing. A vibration device comprising: a drive unit mount to which a vibration generator is fixed; and a plurality of leaf springs of the same shape and size, which are arranged inclined at a predetermined angle and connect the movable base and the drive unit mount. In the parts supply machine,
A connection point of the upper end of each of the plurality of leaf springs to the leaf spring attachment part of the movable base by a bolt, and a connection point of the lower end of each of the plurality of leaf springs to the leaf spring attachment part of the drive part attachment base by a bolt. When the vertical excitation force generator is driven to cause the component receiver to undergo torsional vibration, the plurality of plates are all on substantially the same circumference when viewed from above. By only bending the springs without twisting them, almost no relative sliding force is generated at the connection points between each of the leaf spring mounting portions and the upper and lower ends of each of the plurality of leaf springs. This is achieved by a vibrating parts feeder characterized by:

Embodiments of the present invention will be described below with reference to FIGS. 6 to 11. In addition, in the figure, Figure 1~
Portions corresponding to those in FIG. 5 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

A movable base 30 is fixed to the bottom surface of the ball 1, and four leaf spring mounting portions 31 are integrally formed around the movable base 30 at equal angular intervals, in this embodiment, at 90 degree intervals. ing. A drive unit mounting base 39 is disposed below the movable base 30, and four leaf spring mounting blocks 32 are fixed to the upper surface thereof at equal angular intervals, that is, at 90 degree intervals, with bolts 33. The upper and lower ends of the stacked leaf spring 34 are fixed to the slope 31a of the leaf spring mounting portion 31 and the slope 32a of the leaf spring mounting block 32 by bolts 37a and 37b, respectively. A spacer 35 is placed between the leaf springs 34.
a and 35b are interposed. At the upper end, a seat plate 36a and a washer are further interposed, and bolts 37a are inserted into these holes, and nuts 38 are screwed and tightened to fix the stacked leaf spring 34 to the leaf spring mounting portion 31. At the bottom end, there is a seat plate 3.
6b, insert the bolts 37b into these holes with washers interposed, and attach the leaf spring mounting block 32.
The stacked leaf spring 34 is screwed into the screw hole formed in the leaf spring mounting block 32,
That is, it is fixed to the drive unit mounting base 39.

As described above, the stacked leaf spring 34 is arranged at a predetermined inclination angle, for example, about 20 degrees with respect to the vertical direction, and connects the movable base 30 and the drive unit mounting base 39 so as to be able to torsionally vibrate. According to the present invention, the bolt 3 between the upper end of the stacked leaf spring 34 and the movable base 30
7a, and the connection points between the lower end of the stacked leaf spring 34 and the leaf spring mounting block 32, that is, the drive unit mounting base 39, are all as conceptually shown in FIG. 8 when viewed from above. They are on the same circumference D centered on point 0. When viewed from the side, all the stacked leaf springs 34 are
and the connection point e of the plate spring mounting portion 31 with the bolt 37a, and the vertical line c passing through the center 0 in FIG.
The distance R between the leaf spring 34 and the leaf spring mounting block 32 is the connection point between the leaf spring 34 and the leaf spring mounting block 32 by the bolt 37b.
This means that it is equal to the distance R' between e' and the vertical line cc. The entire drive unit consisting of the electromagnet 14, coil 15, leaf spring 34, etc. is mounted on the drive unit mounting base 3.
9 is covered with a cover 40 fixed to a protrusion 39a integrally formed with the protrusion 39a.

Although the embodiment of the present invention is configured as described above,
Next, this effect will be explained. When alternating current is applied to the coil 15 of the electromagnet 14, an attractive force that changes sinusoidally in the vertical direction is generated, which causes the movable base 3 to
0, that is, the ball 1 performs a known torsional vibration a'. At this time, the drive unit mounting base 39 also undergoes torsional vibration b', but its amplitude is much smaller. At this time, as shown in FIG. 10, the upper end of the leaf spring 34 bends around the node n' along the line c'-c', and the lower end also bends around the node n' along the line d'-d'. Perform a bending motion around ′. In FIG. 10, the movement of the leaf spring 34 is exaggerated as shown by solid lines and dashed-dotted lines, but most of these leaf springs 34 (only one is shown for clarity) Due to the twistless bending motion, the upper end of the leaf spring 34 and the movable base 30
Relative slippage is prevented between the leaf spring 34 and the spacers 35a, 35b, between the leaf spring 34 and the seat plates 36a, 36b, etc. at the connection point between the lower end and the drive unit mounting base 39. The force generated is much smaller than before. Therefore, even during continuous operation, there is almost no slippage between these members and the natural frequency of the vibration system hardly changes. It has been experimentally found that the swing width a' of the ball 1 hardly changes even after continuous operation for a long time, as shown in FIG. Further, there is little change in the natural frequency and amplitude due to the difference in the tightening force between the bolts 37a and 37b.

Further, since almost no torsional deformation of the leaf spring 34 occurs, the stress of the leaf spring for a constant swing width of the ball 1 is much smaller than in the past. Furthermore, in the past, the thickness of the leaf springs was reduced to increase the number of stacked leaf springs in order to facilitate torsional motion, but in this embodiment, this number can be minimized.

Although the embodiments of the present invention have been described above, the present invention is of course not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiment, the leaf springs 34 are arranged at four locations at equal angular intervals, but the leaf springs 34 are not limited to this, and may be arranged at three or five or more locations.

Further, in the above embodiments, a stacked leaf spring has been described, but it is of course possible to arrange one leaf spring at a plurality of locations.

Further, in the above embodiment, the leaf spring mounting block 32
is formed separately from the drive part mounting base 39, and these are integrated with the bolt 33, but these may be formed integrally like the upper leaf spring mounting part 31. The shape of the mounting base 39 is also not limited to that shown in the drawings.

Further, in the above embodiments, the electromagnet 14 was used as the vertical excitation force generator, but the present invention is not limited to this, and for example, a pair of vibrating motors may be used.

Furthermore, although a so-called parts feeder has been described in the above embodiments, the present invention is also applicable to a so-called spiral elevator in which a spiral track is formed on the outer periphery of a cylinder.

As described above, according to the vibrating component feeder of the present invention, the amplitude of the component receiver hardly changes during operation. Further, since almost no torsional deformation of the leaf spring occurs, the stress of the leaf spring with respect to a constant vibration width of the component receiver becomes much smaller than in the past. Furthermore, in the past, the thickness of the leaf spring was reduced to increase the number of stacked leaf springs in order to facilitate torsional motion, but this number can be minimized.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a conventional parts feeder, Fig. 2 is a plan view in the -line direction in Fig. 1, Fig. 3 is a conceptual plan view showing the arrangement of leaf springs in the parts feeder of Fig. 1, and Fig. 4 The figure is a conceptual side view showing the movement of the leaf spring in the parts feeder shown in Fig. 1, and Fig. 5 is a graph showing temporal changes in the width of the ball in the parts feeder shown in Fig. 1.
6 is a side view of a parts feeder according to an embodiment of the present invention, FIG. 7 is a plan view in the line direction in FIG. 6, and FIG. 8 is a conceptual plan view showing the arrangement of leaf springs in the parts feeder of FIG. 9 is a conceptual side view showing the arrangement of the leaf springs, FIG. 10 is a conceptual side view showing the movement of the leaf springs in the parts feeder shown in FIG. 6, and FIG. 11 is a conceptual side view showing the movement of the leaf springs in the parts feeder shown in FIG. 6. 2 is a graph showing temporal changes in the amplitude of In the figure, 1... Ball, 2... Truck, 15... Electromagnet, 30... Movable base, 31...
Leaf spring mounting part, 32... Leaf spring mounting block, 3
9... Drive unit mounting base, 34... Leaf spring, 37a,
37b...Bolt, 38...Natsuto.

Claims (1)

[Claims] 1. A component receiver having a spiral component transfer track, a movable table fixed to the bottom of the component receiver, and a vertical excitation force generator disposed below the movable table. a drive unit mount; a plurality of leaf springs of the same shape and size that are inclined at a predetermined angle and connect the movable base and the drive unit mount;
In the vibrating component feeder, the upper end of each of the plurality of leaf springs is connected to the leaf spring mounting portion of the movable base by a bolt, and the lower end of each of the plurality of leaf springs is connected to the drive unit mounting base. The vertical excitation force generator is driven to apply torsional vibration to the component receiver so that the bolt connection points to the leaf spring mounting portion are all on the same circumference when viewed from above. By causing each of the plurality of leaf springs to perform only a bending motion with almost no twisting when the plurality of leaf springs are placed in the A vibrating parts feeder characterized in that almost no sliding force is generated.