JPH0126649Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a component feeding device in which a component feeding rail is fixed on a vibrating table, and the components fed onto the rail are sequentially fed by vibration.

For example, as a component feeding device used in an automatic chip component mounting device that mounts various chip-shaped electronic components at predetermined positions on a printed circuit board, a component feeding device that fixes chip components supplied from a hopper on a vibrating table is used. There is a device in which the material is dropped onto a feeding rail and vibrated on a vibration table to sequentially feed the material to the tip of the rail.

FIG. 1 schematically shows such a component feeding device. A component feeding rail 1 is mounted on a vibration table 2 that vibrates slightly in the direction of arrow A by a vibration device (not shown), and a rail holder 3. Vibration table 2
is attached to the base 5 via an inclined plate spring 4. A hopper 6 for supplying parts is attached to the rear end of the rail 1, and parts stored inside the hopper 6 fall onto the rail 1, are aligned, and are sequentially fed toward the tip.

In such a component feeding device, efficient component feeding can be performed by adjusting the strength of the vibration of the vibration table 2, that is, the magnitude of the amplitude, according to the shape, weight, etc. of the component to be fed. I can do it.

Conventionally, the vibration adjustment of the shaking table 2 has been carried out by changing the voltage of the commercial AC power supply, which is the power source that supplies the vibrating device consisting of an electromagnet and iron piece attached to the bottom surface of the shaking table 2, using a transformer or the like, or by using a semiconductor This was done by controlling the AC waveform with a waveform control circuit, but in this conventional vibration adjustment method, in addition to the AC electromagnet and suction iron piece that make up the vibration device,
This required a transformer and electronic circuit to change the voltage.

In order to solve this problem, a plurality of slanted angle fittings each having a movable iron piece in the center are attached to the vibration table, and a parallel bracket is fixed on the base to form a pair with these angle fittings. Supports through which angle fittings are inserted are installed at multiple positions on each bracket, and coil springs are adjustable on both sides of each support with adjustment nuts, and by adjusting these adjustment nuts, the movable iron piece can be adjusted. It has also been proposed that the vibration amplitude of the vibration table can be adjusted by changing the position of the vibration table and the distance between the vibration table and the electromagnet fixedly installed on the base.

However, the amplitude adjustment mechanism of such a component feeding device is extremely complicated, which increases production costs.In addition, the adjustment requires adjusting a large number of adjustment nuts. Since it is not possible to do this while checking the feeding condition, the user is forced to make rough estimates, make adjustments, and then repeatedly check the feeding condition, which requires a great deal of time and effort.

This idea was made in view of the above points,
It is an object of the present invention to provide a component feeding device that can easily adjust the vibration amplitude of a vibration table without providing a transformer, a control circuit, or a structurally complex amplitude adjustment mechanism.

Therefore, the parts feeding device according to this invention has a vibrating device consisting of an AC electromagnet and an iron piece whose position relative to the electromagnet can be changed, and the parts feeding device is configured to move the parts fed to the parts feeding rail fixed on the vibrating table. In a parts feeding device that sequentially feeds parts by vibration, an iron piece is pivoted to a vibration table via a spring washer so that it can be rotated from the outside but cannot be rotated by the attraction force of an electromagnet.

Hereinafter, embodiments of this invention will be described with reference to FIGS. 2 to 5 of the accompanying drawings.

FIG. 2 is a perspective view showing an embodiment of this invention, which corresponds to the state in which the component feeding rail 1 and the hopper 6 are removed from FIG. 1. The first vibration table 2
1 is attached with second vibration tables 22, 22 on both sides thereof, and the two second vibration tables 22, 22 are connected to each other by a connecting plate 23 and are integrated.

Then, the AC electromagnet 7 is fixedly installed on the lower surface of the first vibration table 21, and the connecting plate 2 of the second vibration table 22, 22 is fixed.
An iron piece 8 having a bent part 8a facing the magnetic pole face of the electromagnet 7 on the top surface of the magnet 3 and an extending knob part 8b is applied with a set screw 10 through a spring washer 9 (FIG. 4) to apply frictional force. Hold it and attach it so that it can rotate,
It constitutes a vibration device.

This frictional force is set to be stronger than the attractive force of the electromagnet 7, so that the iron piece 8 does not rotate about the set screw 10 even when the electromagnet 7 is energized.

Note that the total weight of the first vibration table 21 and the electromagnet 7 fixed thereto is equal to the total weight of the second vibration table 22, 22,
If the total weight of the connecting plate 23 and the iron piece 8 is set to be approximately equal to the total weight, the first and second vibration tables 21,
22 are vibrated in opposite directions, their vibrations cancel each other out and the vibrations are not transmitted to the base 5.

The embodiment of this invention has the above-mentioned configuration, in which rails are fixed on the first and second vibration tables 21 and 22, and the electromagnet 7 is placed in a state where parts can be fed.
When an alternating current of a predetermined frequency is supplied to the electromagnet 7, the iron piece 8 is attracted and paused repeatedly by the electromagnet 7, and both the electromagnet 7 and the iron piece 8 vibrate, causing the vibration tables 21 and 22 to vibrate slightly in the direction of arrow A in FIG. Since the rail (not shown) fixed thereon is also slightly vibrated, the parts are sequentially fed on the rail from the hopper side toward the tip of the rail.

At this time, if the vibration is too strong relative to the shape, size, weight, etc. of the parts to be fed, that is, if the amplitude is too large, there is a risk that the part will jump off the rail 1, while if the vibration is too weak, that is, the amplitude If it is too small, the parts will not be fed smoothly on the rail 1.

Therefore, while monitoring the feeding status of the parts, if the vibration is too strong, displace the tip knob 8b of the iron piece 8 in the direction of arrow A as shown in FIG. 4 against the frictional force of the spring washer 9, and 7 magnetic pole face and iron piece 8
By widening the gap C between the folded portion 8a and the bent portion 8a, the suction force becomes weaker and the amplitude of the vibration becomes smaller.

If the vibration is too weak, press the knob 8b of the iron piece 8.
If the gap C is closed by displacing the gap C in the direction of the arrow B, the suction force becomes stronger and the amplitude of the vibration becomes larger.

Note that if the base 5 is firmly fixed to a fixed part and its vibrations are absorbed, only one vibrating table may be used. In that case, only the iron piece 8 is attached to the vibrating table, and the electromagnet 7 is attached to the base 5. It may be fixed to .

As mentioned above, in the parts feeding device according to this invention, the iron piece is pivotally mounted on the vibrating table via a spring washer so that it can be rotated from the outside but cannot be rotated by the attraction force of the electromagnet. By simply rotating the iron piece against the frictional force with the vibration table while monitoring the feeding status of the parts, the vibration amplitude of the vibration table can be adjusted by changing the distance from the electromagnet. This eliminates the need for transformers, semiconductor-based waveform control circuits, or complex adjustment mechanisms for adjusting the spacing between electromagnets and iron pieces, which were used in component feeding devices, making the configuration significantly simpler and making it easier to adjust vibration amplitude. The work efficiency is also greatly improved.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing an example of a parts feeding device to which this invention is applied; FIG. 2 is a perspective view showing an embodiment of this invention with rails and hoppers removed;
FIG. 3 is a side view thereof, FIG. 4 is a plan view showing only the vibrating device, and FIG. 5 is a perspective view showing only the vibrating device. 1... Rail, 2... Vibration table, 4... Plate spring, 7... AC electromagnet, 8... Iron piece, 8a...
Bending portion, 8b...Knob portion, 9...Spring washer, 10...Set screw, 21...First vibration table, 22...Second vibration table, 23...Connecting plate.

Claims (1)

[Scope of utility model registration request] In a component feeding device that has a vibrating device consisting of an AC electromagnet and an iron piece whose position relative to the electromagnet can be displaced, and sequentially feeds components by vibration to a component feeding rail fixed on a vibrating table. , the iron piece is pivotally attached to the vibration table via a spring washer so as to be rotatable but not rotated by the attraction force of the electromagnet, and a knob portion that can be operated from the outside is extended to the iron piece. A parts feeding device characterized by: