JPH04237195A - Electronic component feed device - Google Patents

Abstract

PURPOSE:To enable a vibration base to be enhanced in vertical vibration amplitude at its rear and lessened in vibration amplitude as a whole by a method wherein the total spring constant of an elastic body located in front of the center of gravity of a vibration part is set larger than that of an elastic body located in the rear of the center of gravity of the vibration part. CONSTITUTION:When a current is made to flow through a magnetic coil 7, an attraction board 8 fixed to a vibration base 3 by screws 17 is attracted by the coil 7. At this point, when a current of power supply frequency is made to flow through the magnetic coil 7, the attractive force of the coil 7 becomes maximal at the positive and the negative peak of the current and zero at the zero value of the current, so that the vibration base 3 is made to vibrate twice as many in frequency as a power supply. Electronic components can not be transferred only by the vibration amplitude of the vibration base 3, and an elastic body is controlled in spring constant so as to enable the resonant frequency of a vibration system composed of a vibration part, an elastic body, and others to be nearly equal to an actual vibration frequency. At the same time, the spring constant of an elastic body front 5a located in front of the center of gravity of the vibration part is set larger than that of an elastic body rear 5b located in the rear of the center of gravity of the vibration part.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component supply device for discharging and conveying electronic components housed in a container by vibration.

0002

2. Description of the Related Art FIG. 7 shows a stick-shaped packaging container (hereinafter referred to as a stick) 1 for storing electronic components.

This packaging container 1 is made of resin or the like, and the electronic components 2 are usually packed in a number of ten pieces per stick, with their movement in any direction other than the direction of ejection being restricted, and both ends are made of rubber or resin. It is covered with a lid.

[0004] Conventionally, electronic component supply devices that discharge electronic components stored in such a packaging container and transport them to a pick-up point of an automatic placement device such as a placement robot include a gravity drop method and a vibration transfer method. Yes, both had their pros and cons. Most of the electronic component supply devices using the vibration conveyance method used an electromagnetic vibration source.

[0005] As shown in FIG. 8, the electronic component supplying device of the vibration conveyance type using the electromagnetic vibration source connects a vibration base 3 and a fixed base 4 with an elastic body 5.
A stick holder 6 in which a stick 1 is set is attached to the top. Furthermore, an electromagnetic coil 7 is attached to the fixed base 4 side, and when an alternating current flows through it,
Suction plate 8 fixed to vibration base 3 according to its frequency
is attracted and vibrates using electromagnetic force. However, since the vibration amplitude at this time is very small and impractical, the elastic body 5
By manipulating the spring constant of the vibration system and adjusting the resonance frequency of the vibration system to near the attraction frequency of the electromagnetic coil 7, a resonance state is achieved, and a vibration amplitude that allows actual conveyance is obtained.

Furthermore, since the elastic body 5 is installed obliquely with respect to the vibration direction, the electronic components 2 on the vibration base 3
As shown in FIG. 9, the object is transported from point A to point B, then falls to point C, and then transported forward again to point D, point E, and so on. This applies not only to the vibrating base 3 but also to the stick holder 6 mounted thereon, as well as to the parallel portions of the stick 1 held by the stick holder 6.

That is, as described above, when vibration occurs, as shown in FIG. 8, the electronic component 2 in the inclined part of the stick 1 held in a curved shape is caused by gravity and vibration to move the electronic component 2 in the parallel part. are each transported forward by vibration and discharged from inside the stick 1 to the transport path of the stick holder 6. Furthermore, due to the vibration of the conveyance path portion, it is conveyed forward and reaches the stopper 9 at the end of the conveyance path. This point is the pick-up point 10, from which the electronic component is picked up by an electronic component mounting device such as a mounting robot, and the electronic component is mounted onto the board.

[0008]

[Problem to be Solved by the Invention] However, in the electromagnetic vibration type electronic component feeding device described above, if there are many electronic components in the stick, or if there are even a few electronic components remaining, the pressing force of them will be applied to the electronic components in front. Since this also applies to components, electronic components in the front row can be transported at an appropriate speed. However, if there are only a few remaining electronic components, hardly any pressing force from the rear can be expected, and the conveyance speed is greatly reduced, unlike in the case described above, because the vibration conveyance force is pure. The most important factor is the transport speed of the last electronic component, which is extremely slow compared to the first electronic component. In order to increase the conveyance speed of this last electronic component, the conveyance speed is increased by increasing the voltage supplied to the electromagnetic coil. However, on the other hand, the vertical amplitude becomes large and the pickup point also bounces up against the stopper, which causes a large deviation in the suction point by the mounting robot or a suction error.

The present invention has been made in view of the above circumstances, and its object is to provide an electronic component supply device in which the vertical amplitude at the rear of the vibration base is increased and the vibration amplitude at the front portion is decreased. . [Structure of the invention]

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a guide provided with a conveyance path for holding a container containing electronic components and guiding the ejected electronic components to a predetermined position. a vibrating section comprising: a vibrating means that holds the guide means and vibrates; a plurality of elastic bodies that support the vibrating means; and a fixing means that fixes a side of the elastic bodies opposite to the vibrating means. and a vibration generating means attached to the fixing means side and applying vibration to the vibrating means by an attractive force generated by electromagnetic force, the vibration generating means being attached to the fixing means side, and vibrating the elastic body located in front of the center of gravity of the vibrating part with respect to the vibration direction. ``Electronic component feeding device, characterized in that the total spring constant is larger than the total spring constant of the elastic body located behind the center of gravity of the vibrating section''; a vibrating section including a holding means provided with a conveyance path for guiding the electronic component to a predetermined position; a vibrating section that holds the holding means and vibrates; a plurality of elastic bodies supporting the vibrating means; The vibration generating means is attached to the elastic body and applies vibration to the vibrating means by electrostrictive force, and the fixing means fixes the opposite coupling side of the elastic body and the vibrating means, and , wherein the total spring constant before the center of gravity of the vibrating section is larger than the total spring constant after the center of gravity of the vibrating section.''

[0011]

[Operation] According to the present invention configured as described above, the total spring constant of the elastic bodies in front of the center of gravity of the vibrating part is equal to the total spring constant of the elastic bodies behind the center of gravity of the vibrating part in the vibration direction. Even if the inertial force of the vibrating parts that each elastic body receives is the same, the amplitude at the rear of the vibrating base will be larger than the amplitude at the front, causing wave vibration, and the electronic components at the rear of the vibrating base will It can be transported at a high speed without jumping up, and the front part of the vibrating base allows for smooth transport at a low speed.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the fixed base 4 has bolts 11
It is fixed to the mounting base 12 by. This fixed base 4
Elastic bodies 5a, 5a are attached to the elastic bodies 5a, 5a by bolts 13, and the vibration base 3 is attached to the other ends of the elastic bodies 5a, 5a by bolts 14. Furthermore, vibration base 3
A stick holder 6 that holds the stick 1 is fixed to the stick holder 6 with screws 15. In addition, the fixed base 4 has
On the other hand, an electromagnetic coil 7 is attached with bolts 16, and a suction plate 8 is fixed to the vibration base 3 with screws 17.

As shown in FIGS. 2 and 3, the stick holder 6 includes a holder body 18, a guide plate 19, and a presser pin 2.
The holding pin 20 is fixed to the guide plate 19 by screws 21, and the guide plate 19 is fixed to the holder body 18 by screws 21'. Furthermore, the presser pin 20 can be adjusted vertically with respect to the guide plate 19, and its position can be changed depending on the size and strength of the stick.
The stick 1 is held by three-point support of the two presser pins 20 and the holder body 18. Furthermore, at this time, the front end of the stick 1 is in contact with a stepped portion 23 between the conveyance path 22 and the holder main body 18, and the setting is such that the electronic components ejected by vibration can smoothly move to the conveyance path 22. There is. Further, a stopper 24 is provided at the front end of the conveyance path 22.
A cushion 25 made of resin or the like is sandwiched between the cushion 25 and the main body 18, and serves to prevent electronic components from rebounding.

In this embodiment configured as described above, when a voltage is applied to the electromagnetic coil 7 and a current flows, an electromagnetic attraction force acts, and the attraction plate 8 fixed to the vibration base 3 by the screws 17 is moved. Attract. At this time, the electromagnetic coil 7
When a current at the power supply frequency (50/60Hz) is applied to the , the attraction force is maximum at the positive and negative peaks, and becomes zero at the zero current value, so the vibration base 3 operates at a frequency twice the power supply frequency. It will vibrate. (By performing half-wave rectification, the frequency can be made the same as the power supply frequency.)

[
[0016] This vibration amplitude itself is very small, and it is not possible to transport electronic components with this amplitude alone. Therefore, the vibration amplitude of the elastic body is adjusted so that the resonant frequency of the vibration system consisting of the vibrating part and the elastic body is approximately equal to the actual vibration frequency. The spring constant is being manipulated. At the same time, the spring constant of the elastic body front part 5a located in front of the center of gravity of the vibrating part is made larger than the spring constant of the elastic body rear part 5b. By configuring like this,
When an alternating current voltage of the power supply frequency is applied, the vibrating part performs resonance vibration, and the amplitude of the rear part becomes larger than the amplitude of the front part, resulting in undulating vibration as shown in FIG. 4. Therefore, a large vibration amplitude is applied to the electronic components in the stick inclined portion and the parallel portion near the rear of the vibrating base 3, and the force that tends to move them forward becomes large. On the other hand, in the stick holder conveyance path near the front of the vibration base 3,
Since the electronic components are subjected to small amplitudes, the conveyance speed decreases, but the vertical bouncing and bounce from the stopper become small, and the vibration at the pickup point at the front end of the conveyance path becomes suitable for being picked up by the mounting robot. Next, other embodiments will be described using the drawings.

In FIG. 5, a piezoelectric element 26 in which a piezoelectric ceramic element 28 is bonded to a metal plate 27 is used as a vibration source, as shown in FIG. is set between. In this embodiment, the piezoelectric ceramic elements 28 are provided on both sides of the metal plate 27, but they may be provided on one side. According to this embodiment, the power consumption is lower than that of the electromagnetic type, and the resonance state can be adjusted using a variable frequency controller.

[0018]

As described above, according to the present invention, the ejection speed from inside the stick is high, and after entering the conveyance path, the vertical bounce is small, and the bounce to the stopper is small and the vibration is smooth. is obtained. Furthermore, since the discharge speed is high, the supply speed of the last electronic component is also improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an electromagnetic electronic component feeding apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of a stick holder of an electromagnetic electronic component feeding device according to an embodiment of the present invention.

FIG. 3 is a top view of a stick holder of an electromagnetic electronic component feeding device according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating the undulating vibration of the present invention.

FIG. 5 is a schematic configuration diagram of a piezoelectric electronic component supplying device according to another embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a piezoelectric element applied to a piezoelectric type electronic component feeding apparatus according to another embodiment of the present invention.

FIG. 7 is an external view of a stick-shaped electronic component packaging container.

FIG. 8 is a schematic configuration diagram of a conventional electromagnetic electronic component supply device.

FIG. 9 is a diagram illustrating a vibration conveyance method for electronic components.

[Explanation of symbols]

1 Packing container (stick) 2 Electronic parts 3. Vibration base 4 Fixed base 5a, 5b Elastic body 6 Stick holder 7 Electromagnetic coil 8 Suction plate

Claims (2)

[Claims] 1. A vibration device comprising a guide means that holds a container containing electronic components and is provided with a conveyance path for guiding the ejected electronic components to a predetermined position, and a vibration means that holds the guide means and vibrates. a plurality of elastic bodies supporting the vibrating means; a fixing means for fixing the opposite side of the elastic bodies to the vibrating means; vibration generating means for applying vibration to the means, and the total spring constant of the elastic bodies before the center of gravity of the vibrating section is equal to the total spring constant of the elastic bodies behind the center of gravity of the vibrating section with respect to the vibration direction. An electronic component supply device characterized by having a spring constant larger than that of a spring. 2. A vibration device comprising a holding means that holds a container containing electronic components and is provided with a conveyance path for guiding the ejected electronic components to a predetermined position, and a vibration means that holds the holding means and vibrates. a plurality of elastic bodies supporting the vibrating means; a vibration generating means attached to at least one of the elastic bodies and applying vibration to the vibrating means by an electrostrictive force; and a plurality of elastic bodies supporting the vibrating means; and a fixing means for fixing the anti-coupling side, with respect to the vibration direction.
An electronic component supply device characterized in that a total spring constant before the center of gravity of the vibrating section is larger than a total spring constant after the center of gravity of the vibrating section.