JP4540842B2 - Surface mount machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a surface mounter configured to suck an electronic component by a head unit and mount it on a predetermined position on a substrate such as a printed circuit board, and in particular, a surface that can remove charged static electricity. Related to mounting machines.
[0002]
[Prior art]
Conventionally, a head unit having a mounting head attracts components such as ICs from a component supply unit, transfers them onto a printed circuit board positioned at a predetermined mounting work position, and mounts the printed circuit board at a predetermined position. Surface mounters configured to be able to do so are generally known.
[0003]
In such a surface mounter, since each element constituting the apparatus has conductivity, it is considered that electrostatic charging that causes a problem cannot be originally generated.
[0004]
[Problems to be solved by the invention]
However, since the above parts are extremely small, it is considered that there is a possibility that a malfunction may occur even with a small amount of static electricity. That is, when the component supply unit causes the head to perform an adsorption operation, there is a risk that the component will rise due to the presence of minute static electricity, causing an adsorption error, or causing the component itself to be damaged.
[0005]
In order to cope with this, it is possible to remove the static electricity by bringing some conductor into contact with a portion where the static electricity may be charged. There are restrictions, and the degree of freedom of layout is hindered in configuring the apparatus.
[0006]
The present invention has been made in view of such circumstances, and the object of the present invention is to reliably remove even a small amount of static electricity without restricting the operation of the head unit or the like. An object of the present invention is to provide a surface mounter capable of reliably performing the above.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a surface mounting machine of the present invention includes a conveying means for conveying a substrate to a mounting work position, a component supply unit that supplies components for mounting on the substrate, and a component from this component supply unit A head unit that picks up a substrate and mounts it on the substrate at the mounting work position, a static elimination means that removes static electricity charged to any one or more of the substrate, the component supply unit, and the head unit in a non-contact state, and the mounting A working position, a housing that covers the component supply unit and the head unit, and an opening / closing cover provided on the housing, wherein the static elimination means is directed toward a space where at least one of the substrate, the component supply unit, and the head unit exists. Static electricity is neutralized by discharging electric charges, and the structure is arranged on the inner wall surface of the opening / closing cover.
[0008]
According to this surface mounter, static electricity charged on any one or more of the substrate, the component supply unit, and the head unit can be removed by the charge eliminating means, so that the component can be reliably mounted on the substrate. In addition, since static elimination by the static elimination means is performed in a non-contact state, there is no restriction on the pick-up operation or mounting operation of the component by the head unit or the like, and the head unit or component supply unit etc. It does not hinder the freedom of layout.
[0009]
Further, in the surface mounter of the present invention, it is possible to specifically and reliably realize static elimination of static electricity in a non-contact state . In addition, it is possible to specifically specify the disposition site of the static elimination means, and it is possible to ensure that the disposition is not restricted with respect to the operation of the head unit or the like. Furthermore, since the cover is to be attached to be openable and closable with respect to the housing, only need performed to cover separate from the body portion of the arrangement of discharging means housing, thereby, distributing the charge removing means Installation and adjustment can be easily performed.
[0010]
In addition, by disposing the charge removal means so that electric charges are emitted toward both the component mounting position of the substrate and the component supply unit, when the component is picked up by the head unit in the component supply unit, the pickup is performed. Static electricity can be removed during the transfer by the head unit to the component mounting position and when the component is mounted on the substrate at the mounting position, so that the surface mounting process can be reliably performed on the substrate. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a plan view schematically showing an embodiment of a surface mounter according to the present invention in a state where a housing 21 described later is omitted. In FIG. 1, a substrate conveying conveyor 2 is disposed on a base 1, and a printed circuit board 3 as a substrate is conveyed from the right side to the left side of the conveyor 2 for a predetermined mounting operation. It stops at the position (indicated by a two-dot chain line).
[0013]
A component supply unit 4 is disposed on the side of the conveyor 2. The component supply unit 4 includes, for example, multiple rows of tape feeders 4a, and can sequentially supply a large number of components accommodated on the tape.
[0014]
Above the base 1, a component mounting head unit 5 is provided, and this head unit 5 can pick up (suck) components from the component supply unit 4 and mount them on the printed circuit board 3. It is driven to be movable in the axial direction (direction in which the conveyor 2 extends) and the Y-axis direction (direction perpendicular to the X-axis on the horizontal plane).
[0015]
Specifically, a pair of guide rails 6 extending in the Y-axis direction is provided on the base 1, and a head unit support member 7 extending in the X-axis direction is installed on the guide rail 6. The head unit support member 7 is screwed with a ball screw shaft 9 in the Y-axis direction via a nut portion 8, and the ball screw shaft 9 is connected to a rotation shaft of a Y-axis servo motor 10.
[0016]
The head unit support member 7 has a guide member extending in the X-axis direction and a ball screw shaft 11 in the X-axis direction. The head unit 5 is supported by the guide member so as to be movable, and is provided in the head unit 5. The nut portion 12 is screwed onto the ball screw shaft 11. The ball screw shaft 11 is pivotally supported by a base end side bearing member 16 provided at the right end portion of FIG. 1 and a tip end side bearing member 17 provided at the left end portion thereof, and the rotation shaft of the X-axis servo motor 13 is supported. Are connected to each other so as to rotate around the axis by driving the X-axis servo motor 13.
[0017]
Thus, the Y-axis servomotor 10 drives the head unit support member 7 in the Y-axis direction via the ball screw shaft 9, and the X-axis servomotor 13 drives the head unit 5 in the X-axis direction via the ball screw shaft 11. Is driven.
[0018]
The head unit 5 is mounted with one or more mounting heads 15 (three examples are shown in FIG. 1) for sucking and mounting the components on the substrate. It is driven in the vertical direction (Z-axis direction) by an elevating mechanism using a Z-axis servo motor (not shown) as a drive source, and is also rotated ( It is driven in the R axis direction). Each head 15 is detachably mounted with a suction nozzle as a component suction portion at the tip thereof, and sucks the component by the negative pressure supplied to each nozzle, while sucking by the positive pressure supply. The parts that had been left are released. In FIG. 1, reference numeral 18 denotes a component recognition camera.
[0019]
FIG. 2 is a partially omitted cross-sectional explanatory view taken along the line AA of FIG. 1, in which 21 is a housing of the surface mounter.
[0020]
The housing 21 accommodates the above-described base 1 and the conveyor 2, the component supply unit 4, the head unit 5 and the like disposed on the base 1 in the X-axis direction (the surface of FIG. 2). One end side in a direction orthogonal to the upstream side device is connected to the upstream device, and the other end side is connected to the downstream device. Then, the substrate 3 sent from the upstream device is transported by the conveyor 2 and stopped at the mounting work position, and the component picked up from the component supply unit 4 by the head 15 of the head unit 5 is mounted at the mounting work position. Then, after this mounting process, the substrate 3 is sent out from the outlet on the other end side in the X-axis direction to the downstream device.
[0021]
One or more opening / closing covers 22 are attached to the housing 21 at an upper position of the component supply unit 4 so that the opening / closing cover 22 can be opened and closed. As shown in FIG. An ionizer (charge discharger) 30 is provided. 2 and 3 exemplify the case where the opening / closing cover 22 is disposed at both sides in the Y-axis direction, and reference numeral 221 in FIG. 3 is a handle for opening / closing the opening / closing cover 22.
[0022]
The ionizer 30 includes one or more (two in the illustrated example) pipe-shaped electrode casings 31 and 31, an amplifier 32 for supplying a high voltage current, and the amplifier 32 to each electrode needle 34 described later. The power supply line 33 is provided. The ionizer 30 neutralizes static electricity by discharging positive and negative ions toward the internal space 23 of the housing 21.
[0023]
Specifically, the electrode casing 31 is closed at both ends, and is formed so that ion discharge ports 311 (see FIGS. 4 and 5) are opened in a predetermined direction at predetermined intervals with respect to the longitudinal direction. Is provided with an electrode needle 34 for discharge. The ion release port 311 is opened obliquely so as to face both the parts 4 and 3 so that ions are emitted to both the component supply unit 4 and the substrate 3 at the mounting work position through the ion release port 311. The electrode needle 34 is supported in the same direction. As a result, when the component supply unit 4 and the substrate 3 are charged with static electricity, even if it is very small, the static electricity is neutralized by the ions released from the electrode needle 34 through the ion discharge port 311. Will be removed. For example, if the charged static electricity is a positive (+) charge, it is neutralized by negative (-) charge ions.
[0024]
In order to accelerate the release of the ions, air may be supplied into the electrode casing 31 so that the air is discharged together with the ions from the respective ion storage / release ports 311.
[0025]
As described above, ions are released from the ionizers 30 on both sides toward the component supply unit 4 and the substrate 3 at the mounting work position, so that not only the component supply unit 4 and the substrate 3 but also the component supply unit 4 and the substrate 3 The entire internal space 23 of the housing 21, which is a moving space of the head unit 5 that moves for mounting, is filled with ions. For this reason, even if static electricity is generated in the component supply unit 4, the substrate 3, the head 15, and the like, the static electricity is neutralized by the ions and reliably removed.
[0026]
Accordingly, it is possible to reliably avoid the occurrence of component adsorption errors by the component mounting head 15 of the head unit 5 and mounting errors on the substrate 3. Moreover, since the static electricity can be eliminated in a non-contact state by the ionizer 30, particularly for any of the movement of the head 15 and the head unit 5, the component supply operation by the component supply unit 4, the substrate transfer operation by the conveyor 2, etc. Will not interfere. In addition, since such an ionizer 30 is arranged with respect to the opening / closing cover 22 of the housing 21, not only can the arrangement be very easy, but also for an existing surface mounter. It can be attached very easily.
[0027]
FIGS. 6 and 7 show an embodiment using another type of ionizer 30a different from the above-described ionizer 30 as the charge eliminating means, and this embodiment is the same as that using the above-described ionizer 30. The operation and effect of can be obtained.
[0028]
The ionizer 30a includes a gun-type electrode casing 31a, an amplifier 32 similar to the above-described ionizer 30, and a power supply line (not shown). The electrode casing 31a is provided with a discharge electrode needle (not shown) disposed forward, and the inner wall surface of the opening / closing cover 22 is interposed via a bracket 35 as shown in FIG. It is attached to each position at predetermined intervals. The electrode casing 31a is arranged by the bracket 35 in such a direction that ions are emitted toward both the component supply unit 4 and the substrate 3 at the mounting work position, like the ionizer 30 described above. .
[0029]
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above-described embodiment, the case where the charge removal unit is provided for the opening / closing cover 22 is shown, but the present invention is not limited thereto, and the charge removal unit may be provided in the housing 21 other than the opening / closing cover 22. Further, not only the housing 21 but also the head unit 5 may be supported at the position outside the moving range of the head unit 5 or may be suspended from the housing 21.
[0030]
In addition to the surface mounter, the static eliminator can be disposed in another device on the mounting line, and in this case, it may be disposed at any position in the range from the loader to the unloader on the mounting line.
[0031]
【The invention's effect】
As described above, according to the surface mounter of the present invention, the static electricity charged on any one or more of the board, the component supply unit, and the head unit can be reliably removed by the static eliminator. Therefore, it is possible to reliably perform the surface mounting process. In addition, since static elimination by the static elimination means is performed in a non-contact state, there are restrictions on the pick-up operation and mounting operation of the components by the head unit, and there is a hindrance to the freedom of layout of the head unit and the component supply unit. Can be avoided.
[0032]
In the present invention, if the static elimination means is disposed facing a space where at least one of the substrate, the component supply unit, and the head unit exists, static elimination of static electricity in a non-contact state can be specifically and reliably realized. Further, if the static eliminating means is disposed on the inner wall surface of the housing of the surface mounter, it is possible to ensure that the operation of the head unit or the like is not restricted. Furthermore, if the static eliminating means is disposed on the inner wall surface of the cover, the static eliminating means can be easily arranged and adjusted.
[0033]
Further, if the static elimination means is designed to discharge electric charges toward both the component mounting position of the board and the component supply unit, when the component is picked up by the component supply unit by the head unit, the picked-up component is mounted. It is possible to reliably eliminate the influence of static electricity in all operations during transfer to the work position and when the above components are mounted on the board at the mounting work position, thereby further reliably performing surface mounting processing on the board. Will be able to.
[Brief description of the drawings]
FIG. 1 is a partially omitted plan view schematically showing an embodiment of the present invention.
FIG. 2 is a partially omitted cross-sectional explanatory view taken along line AA in FIG.
FIG. 3 is a partially omitted side view of FIG. 2;
FIG. 4 is a partially enlarged view of FIG. 2;
FIG. 5 is a partially enlarged explanatory view taken along line BB in FIG. 4;
FIG. 6 is a view corresponding to FIG. 2 showing another embodiment.
7 is a partially omitted side view of FIG. 6. FIG.
[Explanation of symbols]
2 Conveyor (conveying means)
3 Printed circuit board (board)
4 Component supply unit 15 Head 21 Housing 22 Open / close cover 23 Internal space (space)
30, 30a ionizer (static elimination means)

Claims (2)

Conveying means for conveying the substrate to the mounting work position, a component supply unit for supplying a component for mounting on the substrate, and a head for picking up the component from the component supply unit and mounting it on the substrate at the mounting work position A unit, static elimination means for removing static electricity charged to any one or more of the substrate, the component supply unit, and the head unit in a non-contact state, a housing that covers the mounting work position, the component supply unit, and the head unit; An opening and closing cover provided on the housing,
The static elimination means neutralizes static electricity by discharging electric charges toward a space where one or more of the substrate, the component supply unit, and the head unit exist, and is disposed on the inner wall surface of the opening / closing cover. A surface mounting machine characterized by that.   2. The surface mounter according to claim 1, wherein the neutralizing means is disposed so as to discharge electric charges toward both the component mounting position of the substrate and the component supply unit.

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