KR101271720B1 - Apparatus and method for inspecting appearance of work - Google Patents

Apparatus and method for inspecting appearance of work Download PDF

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KR101271720B1
KR101271720B1 KR1020100109014A KR20100109014A KR101271720B1 KR 101271720 B1 KR101271720 B1 KR 101271720B1 KR 1020100109014 A KR1020100109014 A KR 1020100109014A KR 20100109014 A KR20100109014 A KR 20100109014A KR 101271720 B1 KR101271720 B1 KR 101271720B1
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workpiece
work
conveyance
conveyance table
linear feeder
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KR1020100109014A
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KR20110059524A (en
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가츠요시 고데라
히로유키 모치즈키
다스쿠 고토
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가부시키가이샤 도쿄 웰드
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Abstract

Provided is an apparatus for inspecting the appearance of a workpiece which can accurately position the workpiece on the conveying table and which does not cause electrostatic breakage or deterioration of characteristics of the workpiece.
The external appearance inspection apparatus 30 of a workpiece | work includes the linear feeder 1 which conveys the workpiece | work W of a hexahedron shape, the conveyance table 2 by which the workpiece | work W from the linear feeder 1 is carried, and the linear feeder 1 Transfer member 21 for aligning and aligning the workpiece W from the transfer table 2 on the transfer table 2, charging means 6A for charging the lower surface of the transfer table 2 to hold the workpiece W, and An imaging means 20 for imaging six surfaces is provided. The transfer material alignment means 21 has the vibration-free part 4 located between the linear feeder 1 and the conveyance table 2, and the alignment guide 7 which aligns the workpiece | work W. As shown in FIG. The alignment guide 7 includes a guide surface 7a which is straight in shape when viewed from the plane.

Description

Apparatus for inspecting the appearance of a workpiece and a method for inspecting the appearance of a workpiece {APPARATUS AND METHOD FOR INSPECTING APPEARANCE OF WORK}

This invention relates to the external appearance inspection apparatus of the workpiece | work which image | photographs the hexahedron of this workpiece | work, and the external appearance inspection method of a workpiece | work while conveying the workpiece | work of a hexahedron.

Conventionally, a device for inspecting the appearance of a chip-shaped electronic component (hereinafter, referred to as a "work") such as a cube-shaped resistor or a capacitor, is mounted on a conveying table made of a transparent object such as glass, and the conveying table is rotated to Background Art Apparatuses are known in which an image is inspected by imaging means such as a camera while carrying a visual inspection.

In this case, the workpiece conveyance table of the visual inspection apparatus is configured to electrostatically absorb and convey the workpiece by static electricity.

That is, first, the workpiece is charged on a linear feeder that aligns and conveys the workpiece by vibration, the workpiece is mounted on the conveying table, conveyed to a predetermined work position, and the workpiece placing surface of the conveying table is worked. It is charged with a polarity opposite to that and the electrostatic adsorption is carried out there (refer patent document 1).

Patent Document 1: Japanese Unexamined Patent Publication No. 2008-260594

However, there exist the following problems with the external appearance inspection apparatus of the conventional workpiece | work.

A 1st problem is that positioning at the time of transferring a workpiece | work from a linear feeder to a conveyance table is difficult. The workpiece | work on a conveyance table has two surfaces in a conveyance direction, two surfaces in a vertical direction, and a total of six surfaces of two surfaces to the left and right of a conveyance direction. In order to image these six surfaces, it is necessary to image these six surfaces with good precision using a fixed imaging means. By the way, when the workpiece on the linear feeder is transferred to the transfer table, the workpiece cannot be transferred only in a certain direction, and after the transfer, the attitude of the workpiece is fixed by electrostatic adsorption, so that the attitude of the individual workpieces is subtle to the attitude of the individual workpiece during imaging. There is a possibility that a difference occurs and the photographing accuracy is lowered.

In addition, since the work is charged while conveying the work in the linear feeder, the work may be adsorbed to the linear feeder by the adsorption action of static electricity during the transport, and the transport speed may decrease, and in the worst case, the work stops.

The second problem is that electrostatic adsorption after work transfer is lowered. Since the workpiece mounting surface and the workpiece of the conveying table are charged with opposite polarities, even if sufficient suction force is secured just before the workpiece transfer, when the workpiece placing surface and the workpiece come into contact by the workpiece transfer, the charge is neutralized at the contact point. The total amount decreases. Therefore, the electrostatic attraction force which acts on the workpiece mounted on the conveyance table falls.

Moreover, when charging the workpiece mounting surface of a conveyance table, the electric charge of opposite polarity to the electric charge which charges a workpiece | work from the ionizer provided in the upper surface of a conveyance table is injected toward a workpiece | work. For this reason, some of the electric charge of the workpiece | work immediately before being transferred to a conveyance table may be neutralized, and in this case, the electrostatic attraction force acting on the workpiece mounted on a conveyance table will fall.

The third problem is the effect on the work by static electricity. When the workpiece placing surface and the workpiece come into contact with each other by the above-mentioned workpiece transfer, the neutralization of the charge along the movement of the charge is performed, which may result in electrostatic destruction of the workpiece or deterioration of characteristics.

The present invention has been made in view of such a point, and when the workpiece is transferred from the linear feeder to the transfer table, the positioning can be performed with good accuracy, and the electrostatic adsorption force after the workpiece transfer is not lowered, and the influence of static electricity on the workpiece An object of the present invention is to provide an apparatus for inspecting external appearance of a workpiece and a method for inspecting external appearance of a workpiece.

The present invention is a linear feeder for conveying a cube-shaped workpiece, a rotatable circular conveyance table made of a transparent member which is transferred from a linear feeder at a transfer point, and is transported on a workpiece conveyance arc in a state where the workpiece is mounted, and a linear Transfer means arranged between the feeder and the transfer table to transfer the workpieces from the linear feeder onto the transfer table and to align the transfer table, holding means for holding the workpiece disposed below the transfer table and mounted on the transfer table, and on the transfer table. An imaging means for imaging the six surfaces of the work, the transfer material alignment means is provided on the non-vibration portion provided between the linear feeder and the conveying table and the downstream side of the non-vibration portion, and a linear guide surface as viewed from a plane for aligning the work. Has an alignment guide having a guide surface of the alignment guide, the plane, And it forms an acute angle with the line connecting the rotational axis of the conveying table, and the work of the appearance inspection apparatus so as to form a tangent to the workpiece transport arc downstream of dissimilar points.

This invention is an external appearance inspection apparatus of the workpiece | work which is characterized by the circular conveyance table consisting of a transparent glass body.

This invention is the external appearance inspection apparatus of the workpiece | work which consists of charging means which blows out charging ion toward the lower surface of a conveyance table, and charges a lower surface of a conveyance table.

The present invention is a device for inspecting the appearance of a work, wherein the holding means is formed of a conductor disposed below the conveying table, and generates a electric field by applying a direct current voltage to the conductor.

The conveyance speed of the workpiece | work by a conveyance table is larger than the conveyance speed of the workpiece | work by a linear feeder, This invention is an external appearance inspection apparatus of the workpiece | work.

This invention is a visual inspection apparatus of the workpiece | work of the guide surface of an alignment guide forming acute angle of 75 degree | times-88 degree with respect to the straight line which connects a transfer point and a conveyance table on a plane.

The present invention relates to a method for inspecting the appearance of a workpiece using an external appearance inspection device of a workpiece, the process of conveying a cube-shaped workpiece by a linear feeder, and a workpiece from the linear feeder on a circular conveyance table via a non-vibrating portion and an alignment guide. The process of moving a workpiece | work on the workpiece conveyance arc of a conveyance table in the state which carried out the process of aligning a workpiece | work by the guide surface of an alignment guide, and holding the workpiece mounted to the conveyance table by a holding means, while moving to the transfer point. And the process of imaging the six surfaces of the workpiece | work on a conveyance table with an imaging means, The external appearance inspection method of the workpiece | work characterized by the above-mentioned.

According to the present invention, when the workpiece is transferred from the linear feeder to the conveying table by holding the workpiece mounted on the upper surface by the retaining means disposed on the lower surface of the conveying table, the retaining means and the alignment guide by the retaining means are used. By making the space | interval on a conveyance table substantially constant, and also making the attitude | position to a conveyance direction constant, positioning with respect to a workpiece | work can be performed with favorable precision. For this reason, the imaging accuracy by an imaging means improves and a high density visual inspection is possible. Moreover, since a workpiece | work is hold | maintained by the holding means arrange | positioned at the lower surface of a conveyance table, without charging a workpiece | work and the workpiece mounting surface of a conveyance table, electrostatic adsorption force does not fall by neutralization of an electric charge after workpiece transfer to a conveyance table. For this reason, since the processing capability of an external appearance inspection apparatus improves and a workpiece | work is not charged, there is no adverse effect, such as electrostatic destruction or characteristic deterioration with respect to a workpiece | work.

BRIEF DESCRIPTION OF THE DRAWINGS The top view of the external appearance inspection apparatus of the workpiece | work which concerns on 1st Example of this invention.
2 is a perspective view showing a workpiece.
3 is an enlarged plan view showing a region S of FIG. 1.
4 is a perspective view of the area S of FIG. 1 as viewed from the direction of arrow Y;
5 is a schematic diagram showing adsorption of a work piece to a conveyance table in a first embodiment of the present invention.
6 (a) and 6 (b) are explanatory diagrams showing the principle of electrostatic induction in the first embodiment of the present invention.
7 (a) and 7 (b) are explanatory diagrams showing the principle of dielectric polarization in the first embodiment of the present invention.
8 (a) and 8 (b) are explanatory diagrams of electric force lines in the first embodiment of the present invention.
9 (a) and 9 (b) are explanatory diagrams of the operation of the alignment guide in the first embodiment of the present invention.
Fig. 10 is a perspective view of an appearance inspection apparatus of a workpiece according to a second embodiment of the present invention, corresponding to Fig. 4 in the first embodiment.
11 is an enlarged plan view of an appearance inspection apparatus of a workpiece according to a second embodiment of the present invention.
It is a schematic diagram which shows the adsorption | suction of the workpiece | work to the conveyance table in Example 2 of this invention.
13 is an explanatory diagram of electric force lines in a second embodiment of the present invention;
14 is an explanatory diagram of an electric force line in a second embodiment of the present invention;
15 is an explanatory diagram of electric force lines in a second embodiment of the present invention;

(First embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to drawings. 1 to 9 are diagrams showing a first embodiment of the external appearance inspection apparatus of the workpiece and the external appearance inspection method of the workpiece according to the present invention.

First, the workpiece | work examined by the external appearance inspection apparatus of a workpiece | work is demonstrated by FIG.

In FIG. 2, the workpiece | work W which consists of chip components, such as a capacitor | condenser and a resistance, has a hexahedron shape, and has the main body Wd which consists of an insulator, and the electrodes Wa and Wb which consist of conductors formed in the both ends of the longitudinal direction of the main body Wd. When performing the external appearance inspection of this workpiece | work W, the workpiece | work W is mounted on the conveyance table 2 mentioned later, the conveyance table 2 is rotated in the direction of the arrow Z in FIG. 2, and the workpiece | work W is conveyed. Then, the imaging means 20 picks up the side surface on the opposite side from the direction of the arrow A from the direction of the arrow A, picks up the side surface in front of the paper from the direction of the arrow B, picks up the upper surface from the direction of the arrow C, and the arrow D The lower surface is imaged from the direction of, the front surface is imaged from the direction of arrow E, and the rear surface is imaged from the direction of arrow F. FIG. At this time, by using the glass transparent conveyance table 2, the 6 surface whole surface of the said workpiece | work W can be imaged in the state which mounted the workpiece | work W. As shown in FIG.

Next, the external appearance inspection apparatus of a workpiece | work is demonstrated. As shown in FIG. 1 and FIG. 3, in the appearance inspection apparatus 30 of the workpiece, the workpiece W is transferred from the linear feeder 1 carrying the workpiece W and the linear feeder 1 at the transfer point 4x. Transfer means for transferring the circular conveyance table 2 made of the transparent material conveyed on the workpiece conveyance arc 5 and the workpiece | work W from the linear feeder 1 on the conveyance table 2, and aligning on the conveyance table 2 ( 21) and 6A of charging means which are arrange | positioned under the conveyance table 2, and serve as a hold | maintenance means which charges the lower surface of the conveyance table 2, and holds the workpiece | work W mounted in the conveyance table 2, and a conveyance table The imaging means 20 which image | photographs 6 surfaces of the workpiece | work W on (2) is provided.

Among these, the transfer material alignment means 21 arranges the vibration-free part 4 provided between the linear feeder 1 and the conveyance table 2, and the alignment guide 7 which aligns the workpiece | work W provided downstream of the vibration-free part 4; In addition, the alignment guide 7 includes a guide surface 7a for aligning the workpiece W. This guide surface 7a has a linear shape when viewed from the plane (as seen from above).

In addition, the imaging means 20 has the side camera part 8, the inner side camera part 9, the upper side camera part 10, the lower side camera part 11, and the front side camera part 12 as mentioned later. And a rear camera section 13.

Next, each component part of the external appearance inspection apparatus 30 of a workpiece is further demonstrated by FIGS.

Here, FIG. 1 is a top view of the external appearance inspection apparatus of the workpiece | work which made the workpiece | work W of the shape shown in FIG. 2, FIG. 3 is an enlarged plan view of the area | region S enclosed with the broken line of FIG. Is a perspective view seen from the direction of arrow Y.

In FIG. 1, the linear linear feeder 1 of a linear shape vibrates by a drive source (not shown), and the workpiece W injected into an unshown part feeder located upstream of the linear feeder 1 is aligned in a line by vibration. It conveys in the direction of arrow N.

The conveying table 2 provided below the linear feeder 1 is made of transparent glass, and is provided horizontally, and is driven clockwise (arrow X direction in FIG. 1) around the rotating shaft 3 by a driving source (not shown). Is rotating. As shown in FIG. 4, the linear feeder 1 descend | falls with slight inclination toward the conveyance table 2, and has the inclination equivalent to the linear feeder 1 at the downstream end, and is non-vibrating part 4 which does not vibrate. ) Is connected to the conveyance table 2 with a slight gap. As a result, the work W gradually descends from the linear feeder 1 via the vibration-free part 4 and is transferred to the conveyance table 2.

In the vicinity of the outer edge part of the upper surface of the conveyance table 2, as shown by the dashed-dotted line of FIG. 1, the workpiece conveyance arc 5 is formed as a circular arc centered on the rotating shaft 3, and the workpiece | work W is After being transferred to the conveyance table 2 from the non-vibration part 4, it is aligned on the workpiece conveyance arc 5 by the action of the alignment guide 7 mentioned later. Here, the workpiece conveyance arc 5 is a target position assumed in order to align the workpiece W, and there is no indication that the workpiece conveyance arc 5 can be visually identified on the upper surface of the conveyance table 2.

In addition, the charging means 6A functions as a holding means for holding the work W mounted on the conveyance table 2. This charging means 6A consists of the ionizer 6 provided just ahead of the position of the vibration-free part 4, and this ionizer 6 is installed just under the conveyance table 2, and carries the conveyance table 2 A positive ion (hereinafter referred to as "charge") is ejected toward the lower surface of the) and the lower surface of the transfer table 2 is positively charged.

In addition, the transfer material alignment means 21 is comprised by the vibration-free part 4 and the guide 7 which has the guide surface 7a among each said component part.

In addition, in FIG. 3, the alignment guide 7 which has the linear guide surface 7a is provided on the outer periphery side side of the conveyance table 2, with a slight clearance gap with the conveyance table 2. 3, the straight line which connects the transfer point 4x and the rotating shaft 3 of the conveyance table 2 is shown as the broken line K. In FIG.

As shown in FIG. 3, the alignment guide 7 conveys the workpiece | work W so that the angle (alpha) which the guide surface 7a and the broken line K make may be acute angle of 75 degree | times-88 degree | times, and the guide surface 7a is more than the transfer point 4x. It is provided so that it may become the tangent of the workpiece conveyance arc 5 at the joining point 7x of the workpiece conveyance arc 5 located downstream of the direction. That is, when the straight line connecting the confluence point 7x and the rotating shaft 3 of the conveyance table 2 is shown by the broken line L, the angle (beta) which the broken line L and the guide surface 7a make becomes 90 degrees.

In addition, as shown in FIG. 1, the side camera part 8 and the inner side camera part 9 which comprise the imaging means 20 along the rotation direction of the conveyance table 2 downstream of the vibration-free part 4 are shown. And an upper camera portion 10, a lower camera portion 11, a front camera portion 12, and a rear camera portion 13 are provided. By this imaging means 20, each surface of the workpiece | work W shown by the arrows A-F in FIG. 2 can be imaged and the external appearance test | inspection with respect to the workpiece | work W on the workpiece conveyance arc 5, respectively. At this time, the conveyance direction of the workpiece | work W shown by the arrow Z in FIG. 2 corresponds to the rotation direction X of the conveyance table 2 in FIG.

Specifically, the side camera portion 8 picks up the side A on the opposite side of the ground to the workpiece W, the inner side camera portion 9 picks up the side B in front of the ground, and the top camera portion 10 picks up the top surface C. After imaging, the lower surface camera section 11 captures the lower surface D, the front camera section 12 picks up the front surface E, and the rear camera section 13 picks up the rear surface F.

1, the discharge part 14 as a discharge means is provided in the downstream of the rotation direction of the conveyance table 2 from the imaging means 20. As shown in FIG. The workpiece | work W which finished the external appearance test | inspection is discharged | emitted to the storage box which is not shown in figure on the workpiece conveyance arc by the discharge part 14 corresponding to the result of an external appearance inspection.

Next, the external appearance inspection method of the workpiece | work which used the external appearance inspection apparatus of the workpiece which consists of such a structure is demonstrated in detail.

In Fig. 1, the workpiece W is fed into an unshown part feeder located upstream of the linear feeder 1, and the workpiece W fed into the part feeder is subjected to the action of the linear feeder 1 oscillated by a drive source not shown. It arranges in a row and conveys in series in the direction of arrow N of FIG. At this time, the workpiece | work W is aligned so that a longitudinal direction may correspond with a conveyance direction, and the arrow Z in FIG. 2 becomes a conveyance direction of the workpiece | work W. FIG. That is, the direction of arrow Z in FIG. 2 coincides with the direction of arrow N in FIG.

Next, the operation of the linear feeder 1 will be described in detail with reference to FIG. 4. FIG. 4: shows the shape of the workpiece | work W conveyed by the linear feeder 1, and is a perspective view which looked at the area | region S enclosed by the broken line in FIG. 4 is a perspective view showing the position of the alignment guide 7 in broken lines in order to make the situation of the work W on the conveyance table 2 easy to see. For addition to the work W, shown by the work on the individual components of the workpiece W 0 ~W 6, shown by the general of the work from any location in the work W.

As shown in FIG. 4, the linear feeder 1 has a slight inclination toward the conveyance table 2 located horizontally below it, and is pushed forward by the vibration of the linear feeder 1 to the next workpiece | work W. that the work W is, in a row in the front-rear direction as shown by W 0 is gradually lowered toward the transfer table (2). Since the linear feeder 1 vibrates, when the linear feeder 1 approaches the position directly above the conveying table 2 when the workpiece W is transferred from the linear feeder 1 to the conveying table 2, the linear There exists a possibility that the feeder 1 and the conveyance table 2 may contact. In order to prevent this, the vibration-free part 4 which does not vibrate is provided between the downstream end of the linear feeder 1 and the conveyance table 2.

Moreover, although it is also considered that the deviation of the conveyance speed of the workpiece | work W arises in the linear feeder 1 due to the dispersion | variation in the vibration of the linear feeder 1, the non-vibration part 4 is carried out by the linear feeder 1 and the conveyance table ( By interposing between 2), this conveyance speed can be made uniform.

By the way, the vibration-free part 4 has the same inclination as the linear feeder 1, and has some clearance gap with the upper surface of the conveyance table 2. As shown in FIG. The workpiece W on the non-vibration part 4 is pushed forward by the subsequent workpiece similarly to the linear feeder 1, and gradually lowers toward the conveying table 2 continuously back and forth as indicated by W 0 .

And, dust due to the rotation of the ET (4) a workpiece W 1 is pushed into the work W 0 which is located immediately after, and different materials in different materials that 4x on the transport table (2), since the conveying table (2) reaches the end of the downstream of the It is conveyed in the direction of the arrow X of FIG. Here, when the length of the non-vibration part 4 is too short, it becomes difficult to equalize a conveyance speed, On the contrary, when this length is too long, there exists a possibility that the workpiece | work W may stop on the way. In the embodiment of the present invention, since the length of the non-vibration part 4 is eight times the dimension of the longitudinal direction of a workpiece | work, the conveyance speed of the workpiece | work W can be made uniform without stopping the workpiece | work W. FIG.

In addition, as described above, an ionizer 6 is provided below the conveyance table 2 to eject positive electric charges toward the lower surface of the conveyance table 2 so that the lower surface of the conveyance table 2 is positively charged. have. In FIG. 4, this positive charge is typically represented by "+". Thus, the lower surface of the conveyance table 2 is positively charged, and the workpiece | work W transferred to the transfer point 4x is attracted by the upper surface of the conveyance table 2.

Next, the adsorption | suction action of the workpiece | work W on the conveyance table 2 is demonstrated by FIG.

6 (a) and 6 (b) are explanatory diagrams showing the principle of electrostatic induction. The electrode Wa of the one end part in the longitudinal direction of the workpiece | work W is shown by FIG. 6 (a). The electrode Wa is made of a conductor, and in a normal state, as shown in Fig. 6 (a), a positive charge represented by + and a negative charge represented by-are present at random positions. Fig. 6 (b) shows the state when the positive charge is brought close to the electrode Wa from the left direction.

Here, the charge T charged with the positive charge is brought close to each other. At this time, the negative charge in the electrode Wa is attracted to the positive charge in the charge T, and the negative charge is collected on the left side WaL side of the electrode Wa close to the charge T. In addition, the positive charge in the electrode Wa repels the positive charge in the electrode T, and collects on the right side WaR side of the electrode Wa far from the electrode T. At this time, negative charge appears on the left side WaL side, and positive charge appears on the right side WaR side. In addition, since the electrode Wa is made of a conductor, the internal charge can move freely, so that no charge exists in the portion between the left side WaL and the right side WaR of the electrode Wa in FIG. This phenomenon is called electrostatic induction.

Further, due to the electrostatic induction, the attraction force indicated by the arrow G in FIG. 6 (b) acts between the negative charge collected on the left WaL side of the electrode Wa and the positive charge in the electric charge T. FIG. For this reason, the electrode Wa is attracted to the electric charge T. When the charge T is away from the electrode Wa, the charge in the electrode Wa returns to the state shown in Fig. 6A again. The same applies to the electrode Wb.

7 (a) and 7 (b) are explanatory diagrams showing the principle of dielectric polarization. 7 (a) shows the main body Wd in the longitudinal center portion of the workpiece W. FIG. In the normal state, the main body Wd is an insulator, and as shown in Fig. 7 (a), a molecule (ellipse of a dashed line) having a pair of positive charges represented by + and negative charges represented by-is random inside. It exists in one location.

7B shows a state when the positive charge is brought close to the main body Wd from the left direction. Here, the charge T charged with the positive charge is brought close to each other. At this time, the negative charge in the main body Wd is attracted to the positive charge in the electric charge T, and the positive charge in the main body Wd reacts with the positive charge in the electric charge T. For this reason, the direction of the molecules in the main body Wd is aligned so that the left side WdL side of the main body Wd close to the charged body T becomes a negative charge, and the right side WdR side of the main body Wd far from the charged body T becomes a positive charge.

As shown in Fig. 7B, negative charges appear on the left side WdL side of the main body Wd, and positive charges appear on the WdR side on the right side. In addition, since the main body Wd is an insulator, the internal charge cannot move freely, and molecules are aligned in a constant direction between the left surface WdL and the right surface WdR. This phenomenon is called dielectric polarization. Further, due to the dielectric polarization, the attraction force indicated by the arrow G in FIG. 7B acts between the negative charge shown on the left side WaL side of the main body Wd and the positive charge in the electric charge T. FIG. For this reason, the main body Wd is attracted to the electric charge T. When the charged body T moves away from the main body Wd, the molecules in the main body Wd return to the state shown in Fig. 7A again.

Next, with reference to FIG. 5, the workpiece | work W transferred to the transfer point 4x is shown to adsorb | suck to the upper surface of the conveyance table 2 by electrostatic induction and dielectric polarization. In FIG. 5, the lower surface of the conveying table 2 is positively charged by the action of the ionizer 6. Since the glass, which is a material of the conveying table 2, is an insulator, the above-mentioned dielectric polarization occurs due to the positive charge present on the lower surface of the conveying table 2, and negative charges are generated on the lower surface side of the conveying table 2. Appears, and a positive charge appears on the upper surface side. Similarly, for the workpiece W 2 transferred from the non-vibration part 4 to the transfer point 4x on the transfer table 2, each of the lower surface side is caused by electrostatic induction on the electrodes Wa and Wb and by dielectric polarization on the main body Wd. Negative charges appear, and positive charges appear on the upper surface side.

In FIG. 5, the electrostatic adsorption force G indicated by the arrow acts between the negative electric charges shown on the lower surface side of the electrodes Wa, Wb and the main body Wd and the positive electric charges present on the lower surface of the conveyance table 2. 2 is adsorb | sucked to the upper surface of the conveyance table 2. As shown in FIG. At this time, only the charges appear on the lower surface of the work W 2 and the upper surface of the transfer table 2 due to electrostatic induction or dielectric polarization, and no charging occurs due to the movement of the charges. For this reason, neutralization of an electric charge does not generate | occur | produce at the time of adsorption, and an adsorption force does not fall even after adsorption. Thus, the work W 2 is conveyed by the rotation of the transfer table (2) from the suction to the upper surface of the transfer table (2) state in the direction of the arrow X.

Next, by the rotation of the work W is conveyed table in the show by a workpiece W 2, the adsorption to the transport table (2) condition (2) of different materials from the dust-ET (4) in different materials that 4x on the transport table (2) It is conveyed in the direction of arrow X.

In this case, the transport table (2), the conveying speed by the rotation linear feeder 1 and the dust-larger than the conveying speed by the East (4), between the work on the carrying table (2) (e.g., W 2 and W of Space between 3 ). Thus, by making the space | interval between the workpiece | work on the conveyance table 2, the front camera part 12 of FIG. 1 image the front surface E of the workpiece | work W shown in FIG. 2, and the back camera part 13 of FIG. When imaging the back surface F of the workpiece | work W shown in FIG. 2, it becomes possible to reliably image the whole surface.

That is, when the work W is different materials be returned to the transport table (2) from different materials that 4x, in a section P in Figure 3 the workpiece W is in the electrostatic attraction state, the transport table (2), such as W 2 → W 3 → W 4 of being quickly accelerated to the conveying speed, the distance of the work in the interval Q, for example, it is widened such as between W 4 and W 5.

At this time, there is a slight gap between the non-vibration part 4 and the conveyance table 2, and since the conveyance speed by the rotation of the conveyance table 2 is larger than the conveyance speed by the non-vibration part 4, the workpiece | work W If 2 is not sufficiently adsorbed on the transport table (2), in the dissimilar material dissimilar to that point 4x on the transport table (2) from a dust-ET (4) the workpiece W has a second if they cause a subtle jump. In this case, since the jump which arises in the workpiece | work W is uneven for every workpiece | work W, a nonuniformity arises in the space | interval of the workpiece | work W on the conveyance table 2 after acceleration. On the other hand, according to the present invention, since the workpiece W 2 is sufficiently adsorbed by the conveying table 2, the case where the workpiece W 2 jumps from the non-vibration part 4 to the displacing point 4x on the conveying table 2 may jump. Without, it is fixed on the conveyance table 2. For this reason, the space | interval of the workpiece | work W after acceleration can be kept substantially constant.

By the way, just above the transfer point 4x of the outer edge part of the conveyance table 2, the alignment guide 7 which has the linear guide surface 7a is provided with a slight clearance gap with the conveyance table 2. As described above, when the straight line connecting the displaced point 4x and the rotating shaft 3 is broken line K in FIG. 3, the alignment guide 7 is such that the angle α formed by the guide surface 7a and the broken line K becomes an acute angle, Moreover, the guide surface 7a is provided so that it may become the tangent of the workpiece conveyance arc 5 at the joining point 7x located in the downstream direction of the transfer point 4x. That is, when the straight line connecting the confluence point 7x and the rotating shaft 3 is shown by the broken line L, the angle (beta) formed by the broken line L and the guide surface 7a becomes 90. For this reason, the transfer point 4x is located in the outer edge part side of the conveyance table 2 with respect to the workpiece conveyance arc 5. Therefore, the conveyance direction (arrow X) of the workpiece | work W transferred to the transfer point 4x becomes a direction toward the guide surface 7a, and can make it the same by correcting the subtle difference of the attitude | position of the workpiece | work W at the transfer point 4x.

Next, the alignment action by the alignment guide 7 will be described with reference to FIGS. 9A and 9B.

9 (a) shows a case where the posture of the workpiece W 2E1 transferred to the transfer point 4X is slightly left to the right direction. The position of the transfer point 4x is the outer edge side of the conveyance table 2 with respect to the workpiece conveyance arc 5, and the rotation direction of the conveyance table 2 shown by the arrow X in FIG. It becomes the same direction as a locus, and the conveyance direction of the workpiece | work W2E1 becomes a direction which faces the guide surface 7a. Therefore, the workpiece W is pressed to 2E1 after abutting on the guide surface (7a), such as the work W 2E2, the guide surface (7a). At this time, since the workpiece WW 2E1 is attracted to the glass table 2 by a force stronger than the frictional force acting between the guide surface 7a, the guide surface 7a does not decelerate even when pressed by the guide surface 7a. Is returned in the form of

FIG. 9B shows a case where the posture of the workpiece W 2E3 transferred to the transfer point 4X is slightly right with respect to the correct direction. Also in this case, the conveyance direction of the workpiece | work W2E3 becomes a direction toward the guide surface 7a, The workpiece | work W2E3 contacts the guide surface 7a like workpiece W2E4 , and is pressed by the guide surface 7a, and W It is conveyed in the form along the guide surface 7a like 2 . In this way, by the adsorption | suction by the electric charge which exists in the lower surface of the conveyance table 2, and the action of the guide surface 7a, the space | interval on the conveyance table 2 of the workpiece | work W is made substantially constant, and also the attitude | position to the conveyance direction It is possible to make a high-precision positioning to keep the constant constant.

By the way, as mentioned above, since the conveyance speed by the rotation of the conveyance table 2 is larger than the conveyance speed by the linear feeder 1 and the non-vibration part 4, the positioned workpiece | work W is interrupted in the section P in FIG. In the adsorbed state, it is rapidly accelerated to the conveying speed by the rotation of the conveying table 2, such as W 2 → W 3 → W 4, and the interval of the workpiece in the section Q is, for example, between W 4 and W 5. Widens And the workpiece W 5 is conveyed while being pressed by the guide surface 7a similarly to the section P, and gradually approaches the workpiece conveyance arc 5. Then, the guide surface (7a) The workpiece transport the transport direction of the workpiece W 6 reached confluence 7x in contact with the circular arc (5) coincides with the direction of workpiece transport arc 5 at the region R, the work W 6 is a guide surface ( It is conveyed in the direction away from 7a). That is, since the electrostatic attractive force acting from the positive charge present on the lower face of the transfer table (2) with respect to the workpiece W 6 on the transport table (2), the work W 6 is surface-holding guide adsorbed on the transport table (2) It deviates from (7a), and is conveyed in the state arrange | positioned on the workpiece conveyance arc 5 after that.

After that, the workpiece W reaches the imaging means 20, and the side camera portion 8, the inner side camera portion 9, the upper side camera portion 10, the lower surface camera portion 11, and the front camera of the imaging means 20. By the part 12 and the back camera part 13, each surface is imaged from the direction shown by the arrows A-F in FIG. 2, and an external appearance test is performed. In this case, since the positioning of the workpiece | work W is performed with favorable precision by the adsorption | suction by the electric charge which exists in the lower surface of the conveyance table 2, and the action of the guide surface 7a, the imaging precision by the imaging means 20 Is improved. The work W which finished the external appearance inspection reaches the discharge | release part 14, and is discharged toward the storage box which is not shown in accordance with the result of an external appearance inspection.

When discharging the workpiece | work W from the discharge part 14, compressed air is blown off from the inner peripheral side of the conveyance table 2, for example with respect to the side surface B in front of the paper surface in FIG. It can be blown to the outer circumference of the guide to the storage box. The work W in the storage box had the states shown in Figs. 6 (b) and 7 (b) because of the positive charges present on the lower surface of the transfer table 2, but as it moved away from the positive charges, Fig. 6 (a). It returns to the state of FIG. 7 (a). During this time, the work W itself does not generate charge due to static electricity.

As described above, in the present embodiment, the work W is attracted to the conveying table 2 by using static electricity, but the work W does not cause electrostatic destruction or deterioration of characteristics due to static electricity. ) and (b).

FIG. 8 (a) shows the electric force line generated by the positive charge present on the lower surface of the conveying table 2 when the workpiece W is mounted on the upper surface of the conveying table 2 and the lower surface of the conveying table 2 is positively charged. Indicates the shape of. As shown in Fig. 8 (a), the electric line of force starts with a positive charge and ends with a negative charge. In this case, since the negative charge is considered to exist in an infinitely far field, the electric field line E1 starts from the positive charge existing on the lower surface of the conveying table 2, and penetrates the conveying table 2 and the work W upwards. Headed. In addition, there are electric force lines that start downward or to the left and right from the positive charge, but are not shown because they are not related to the present invention. At this time, negative charges appear on each lower surface by electrostatic induction on the electrodes Wa and Wb of the work W, and dielectric polarization on the main body Wd, and positive charges appear on each upper surface at the same time. At this time, since the electrodes Wa and Wb are conductors, positive charges are collected on the upper surface thereof, and negative charges are collected on the lower surface thereof. Therefore, electric charge lines E2 are generated inside the electrodes Wa and Wb due to these charges. The direction starts from the positive charge present on the upper surface and terminates at the negative charge present on the lower surface.

Therefore, since the electric force lines E1 and E2 exist in opposite directions within the electrodes Wa and Wb, the electric force lines E1 and E2 are erased from each other, and as shown in Fig. 8B, no electric force lines exist in the electrodes Wa and Wb. The electric force lines divided at the electrodes Wa and Wb are represented by E1 'in FIG. 8 (b). In this state, since no electric force lines exist in the electrodes Wa and Wb, the electrodes Wa and the electrodes Wb are coin-shaped. That is, no voltage is applied between the electrode Wa and the electrode Wb, and electrostatic breakdown of the workpiece or deterioration of characteristics do not occur.

By the way, in the transient state where the workpiece | work W is transferred to the conveyance table 2 from the non-vibration part 4, in the electrode Wa and Wb of the workpiece | work W by electrostatic induction based on the electric charge which exists in the lower surface of the conveyance table 2, It is also conceivable that the electrodes Wa and Wb are in contact with the vibration-free part 4 and the conveyance table 2 and repeat the separation while the charge moves in each electrode. If the charges in the electrodes Wa and Wb move between the outside during contact or separation of the electrodes Wa and Wb, electrostatic breakdown due to discharge may also be caused. In this case, since the vibration-free part 4 is comprised using the material which has high resistance value, such as an insulator like the conveyance table 2, it does not cause a movement of electric charge between electrodes Wa and Wb.

In addition, in the said embodiment, although the example which charged the lower surface of the conveyance table 2 positively was shown, you may electrified to negative as needed. In addition, although the example which the conveyance table 2 consists of a glass material showed, the material of the conveyance table 2 is not limited to glass, if it is a transparent body.

(Second Embodiment)

10 to 15, a second embodiment of the present invention will be described.

In the second embodiment of the present invention shown in FIGS. 10 to 15, instead of arranging the charging means 6A below the conveyance table 2, a conductive plate (conductor) 15 is provided below the conveyance table 2. ) Is only different, and the other configuration is substantially the same as that of the first embodiment shown in FIGS. 1 to 9.

In the second embodiment shown in Figs. 10 to 15, the same parts as those in the first embodiment shown in Figs. 1 to 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.

Here, FIG. 10 is a perspective view of the area S enclosed by the broken line in FIG. 1 as viewed from the direction of the arrow Y, and corresponds to FIG. 4. In FIG. 10, instead of the charging means 6A made of the ionizer 6 in FIG. 4, a conductive plate 15 made of a conductor is placed on the lower surface of the conveyance table 2 in the lower side of the conveyance table 2. It is arranged with a gap. The electrically conductive plate 15 has a planar shape, and as shown in FIG. 12, the surface 15a is substantially parallel to the conveyance table 2. As shown in FIG. In addition, a DC power supply 16 is connected to the conductive plate 15, and a DC voltage is applied to the electric field generating means. 11 shows an arrangement position of the conductive plate 15. FIG. 11 shows an enlarged plan view of the area S enclosed by the broken lines in FIG. 1 and corresponds to FIG. 3. In FIG. 11, the conductive plate 15 extends in a long and thin shape in the horizontal direction, and the guide surface 7a of the workpiece conveyance arc 5 and the alignment guide 7 on the conveyance table 2 of the workpiece W from the transfer point 4x. The longitudinal direction is arrange | positioned below the conveyance table 2 corresponding to) along the workpiece conveyance arc 5 of the workpiece | work W. As shown in FIG.

10 to 15, the operation of the second embodiment of the present invention will be described below.

In FIG. 11, the work W conveyed in a line by the vibration of the linear feeder 1 is transferred to the transfer point 4x on the conveyance table 2 and is generated in the conductive plate 15 connected to the DC power supply 16. It is adsorbed on the upper surface of the conveying table 2 by electrostatic induction and dielectric polarization by the action of.

The shape of this adsorption action is shown in FIG. In FIG. 12, the conductive plate 15 is disposed with a slight gap on the lower surface of the transfer table 2, the DC power supply 16 is connected to the conductive plate 15, and a positive DC voltage is applied thereto. For this reason, positive charge appears on the conductive plate 15.

Due to the action of the positive charges, dielectric polarization occurs as in FIG. 5, and negative charges appear on the lower surface side of the conveyance table 2 facing the conductive plate 15, and positive charges appear on the upper surface side. . Similarly, in the workpiece W 2 transferred from the vibration-free part 4 to the transfer point 4x on the transfer table 2, electrostatic induction is applied to the electrodes Wa and Wb, and dielectric polarization is applied to the main body Wd, respectively. A charge appears, and a positive charge appears on the upper surface side.

The electrostatic attraction force G indicated by the arrow acts between the negative electric charges shown on the lower surface side of the electrodes Wa, Wb, and the main body Wd, and the positive electric charges of the conductive plate 15, whereby the workpiece W 2 is the conveying table 2. It is conveyed in the direction of arrow X by the rotation of the conveyance table 2 in the state attracted to the upper surface of ().

In this case, similarly to the first embodiment shown in Figs. 8A and 8B, since the charging by the static electricity does not occur in the workpiece W itself, the workpiece W does not cause electrostatic destruction or deterioration of characteristics.

In addition, in the description of the said Example, it demonstrated as the surface of the electrically conductive plate 15 being substantially parallel to the surface of the conveyance table 2, but the positional relationship of the surface of the electrically conductive plate 15 and the surface of the conveyance table 2 was demonstrated. Is not limited to this. The enlarged view seen from the L direction in FIG. 11 is shown in FIG. 13, and the shape of the electric field line starting from the positive electric charge of the electrically conductive plate 15 is shown in FIG.

As shown in FIG. 13, electrostatic induction and dielectric polarization occur as the electric force lines penetrate the conveyance table 2 and the workpiece W, negative charges are generated on the lower surface of the workpiece W, and positive charges are generated on the upper surface of the workpiece W. FIG. . Here, simply, the electric charge which generate | occur | produces in the conveyance table 2 by dielectric polarization is not shown in figure.

As shown in FIG. 13, among the electric field lines starting from the positive charge on the conductive plate 15, starting from the positive charge existing in the vicinity of the end face 15x of the conductive plate 15 (Ex in the drawing) , It has a property that it bends toward the side where no charge exists, that is, the outer side of the conductive plate 15. For this reason, instead of the structure shown in FIG. 13, you may arrange | position the electrically conductive plate 15 so that the surface 15a may be substantially perpendicular to the conveyance table 2 like FIG. In this case, the conductive plate 15 extends in the shape of elongate in the horizontal direction, and in the lower side of the conveying table 2 corresponding to the guide surface 7a of the alignment guide 7, the longitudinal direction is a workpiece conveying arc of the workpiece W. It is arrange | positioned so that it may become substantially parallel to (5).

In Fig. 14, of the electric force lines starting from the positive charge of the conductive plate 15, the electric force lines starting from the positive charge near the end face 15x penetrate the conveyance table 2 and the work W. For this reason, as in the case shown in Fig. 13, negative charges are generated on the lower surface of the work W and positive charges are generated on the upper surface of the work W by electrostatic induction and dielectric polarization.

In addition, as shown in FIG. 15, a conductive plate 15 having an L-shaped cross section may be provided. In this case, the surface 15b is arrange | positioned so that it may become substantially perpendicular to the conveyance table 2 among the 2 surfaces 15b and 15c which cross | intersect the electroconductive plate 15, and the surface 15c approximates the conveyance table 2 You may arrange in parallel. In this case, the conductive plate 15 extends in the shape of elongate in the horizontal direction, and in the lower side of the conveying table 2 corresponding to the guide surface 7a of the alignment guide 7, the longitudinal direction is a workpiece conveying arc of the workpiece W. It is arrange | positioned so that it may become substantially parallel to (5).

In FIG. 15, since the electric field lines do not cross each other, the electric field lines starting from the positive charges present near the end face 15x of the electric field lines starting from the positive charges of the conductive plate 15 are transferred to the transfer table 2. ) And the work W. For this reason, similar to FIG. 13, negative charges are generated on the lower surface of the work W and positive charges are generated on the upper surface of the work W by electrostatic induction and dielectric polarization.

In addition, in the description of the second embodiment, an example in which the conductive plate 15 is positively charged is shown, but may be negatively charged as necessary.

1: linear feeder 2: conveying table
3: center axis of conveyance table 4: vibration-free part
4x: Jaeje Lee 5: Walk return arc
6: ionizer 6A: charging means
7: alignment guide 7a: guide surface
7x: confluence point 8: side camera part
9: internal camera unit 10: top camera unit
11: bottom camera portion 12: front camera portion
13: rear camera portion 14: discharge portion
15: conductive plate 20: imaging means
21: dissimilar alignment means 30: workpiece inspection device
W: work Wa, Wb: electrode of work
Wd: the body of the work

Claims (7)

A linear feeder for conveying a cube-shaped workpiece,
Rotatable circular conveyance table which consists of a transparent body which a workpiece transfers from a linear feeder at a transfer point, and conveys on a workpiece conveyance arc in the state which mounted this workpiece,
Transfer material alignment means which is provided between the linear feeder and a conveyance table, and transfers the workpiece | work from a linear feeder on a conveyance table, and aligns;
A holding means disposed below the conveying table and holding the workpiece mounted on the conveying table;
It is provided with the imaging means which image | photographs 6 surfaces of the workpiece | work on a conveyance table,
The dissimilar material aligning means has a vibration-free part provided between the linear feeder and the conveying table, and an alignment guide having a guide face in a straight line when viewed from a plane for arranging the work, which is provided downstream of the vibration-free part,
The guide surface of the alignment guide includes a plane point, a transfer point, and a joining point that joins the workpiece conveyance arc at the downstream side of the transfer point, and the guide surface includes a straight line connecting the transfer point and the joining point, and a downstream side of the joining point. The straight line including the straight line and connecting the displaced point and the confluence point forms an acute angle with respect to the straight line connecting the displaced point and the rotational axis of the conveying table, and the straight line downstream from the confluence point connects the converging point and the rotating shaft of the conveying table. The workpiece | work which is orthogonal to a straight line and carried by the transfer point is pressed by the straight line which connects the transfer point and confluence point of a guide surface, and is conveyed along the guide surface, hold | maintained by the holding means. The method of claim 1,
The circular conveyance table consists of a transparent glass body, The external appearance inspection apparatus of the workpiece | work characterized by the above-mentioned. The method of claim 1,
The holding means consists of charging means which blows out charged ions toward the lower surface of the conveyance table, and charges the lower surface of the conveyance table. The method of claim 1,
The holding means consists of a conductor arrange | positioned under a conveyance table, and the external appearance inspection apparatus of the workpiece | work which generate | occur | produces an electric field by applying a DC voltage to this conductor. The method of claim 1,
The conveyance speed of the workpiece | work by a conveyance table is larger than the conveyance speed of the workpiece | work by a linear feeder, The external appearance inspection apparatus of the workpiece | work characterized by the above-mentioned. The method of claim 1,
The guide surface of the alignment guide forms an acute angle of 75 degrees to 88 degrees with respect to a straight line connecting the transfer point and the conveyance table on a plane. In the external appearance inspection method of the workpiece | work using the external appearance inspection apparatus of Claim 1,
A process of conveying a cube-shaped workpiece by a linear feeder,
A process of aligning the workpiece by the guide surface of the alignment guide while transferring the workpiece from the linear feeder to the transfer point on the circular conveyance table via the vibration-free part and the alignment guide;
A step of conveying the workpiece on the workpiece conveyance arc of the conveyance table while holding the workpiece mounted on the conveyance table by the holding means;
Process of imaging 6 surfaces of the workpiece | work on a conveyance table by an imaging means
Appearance inspection method of the workpiece, characterized by having a.
KR1020100109014A 2009-11-27 2010-11-04 Apparatus and method for inspecting appearance of work KR101271720B1 (en)

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JPJP-P-2010-167323 2010-07-26
JP2010167323A JP5598912B2 (en) 2009-11-27 2010-07-26 Work appearance inspection apparatus and work appearance inspection method

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