JP2015215180A - Wire harness appearance inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an appearance inspection device capable of omitting an illumination or making a configuration of the illumination simple.SOLUTION: A wire harness appearance inspection device 1 includes: a set surface 10a; an imaging section 20; and an appearance success/failure determination section 41 for determining whether various mounting members C and P are mounted at predetermined mounting positions, from image information of a wire harness WH captured by the imaging section 20. Image information D includes image information of the set surface 10a. The appearance success/failure determination section 41 acquires a lightness value or an average lightness value of the set surface 10a from the image information D, acquires a lightness value or an average lightness value from mounting area image information D1, D2, D3 and D4 of the various mounting members C and P in the image information D and, on the basis of a magnitude of a difference between the lightness value or the average lightness value of the set surface 10a and the lightness value or the average lightness value of the mounting area image information, determines whether the mounting members C and P in achromatic colors are mounted at the predetermined mounting positions.

Description

  The present invention relates to a wire harness appearance inspection device for inspecting the appearance of a wire harness.

  Conventionally, a wire harness is used as an electrical wiring member for connecting various electrical components mounted on an automobile. In this wire harness, various attachment members such as a corrugated tube, a clamp, a grommet, and a protector are attached to a focusing electric wire formed by bundling a plurality of electric wires. For this reason, in the manufacturing process of a wire harness, the external appearance inspection process which test | inspects whether various attachment members are attached to the predetermined attachment position is provided.

  For example, Patent Literature 1 describes a wire harness appearance inspection device that determines the pass / fail of the appearance of a wire harness by image analysis processing.

JP 2010-249744 A

  However, there are so-called achromatic colors such as white, gray, and black mounting members. Such achromatic mounting members are used for color analysis in image analysis processing by an appearance inspection apparatus. If the lightness is identified only by the lightness, the outer surface of the three-dimensional mounting member is uniformly illuminated so that the lightness does not vary, and the influence of the illumination at the installation location of the visual inspection device It is necessary to incorporate an illumination device that eliminates the above in the visual inspection apparatus, and as a result, there is a problem that the illumination of the visual inspection apparatus has a complicated configuration.

  The present invention has been made in view of the above, and an object thereof is to provide an appearance inspection apparatus capable of omitting illumination or having a simple configuration.

  In order to solve the above-described problems and achieve the object, a wire harness appearance inspection device according to claim 1 of the present invention includes a set surface serving as a surface for setting a wire harness, and the wire harness on the set surface. An imaging unit that captures an image; and an appearance pass / fail determination unit that determines whether or not various attachment members of the wire harness are attached to a predetermined attachment position from image information of the wire harness acquired by the imaging unit. In the wire harness appearance inspection device, the image information includes image information of the set surface, the appearance pass / fail determination unit obtains a lightness value or an average lightness value of the set surface from the image information, and A lightness value or an average lightness value is acquired from within each attachment region image information of the various attachment members of the image information, and the set surface Based on the magnitude of the difference between the brightness value or the average brightness value and the brightness value or the average brightness value of the attachment area image information, it is determined whether or not the achromatic attachment member is attached at a predetermined attachment position. It is characterized by doing.

  In the wire harness appearance inspection apparatus according to claim 1 of the present invention, the lightness value or average lightness value of the set surface and the lightness value or average lightness value of the attachment region image information calculated by the appearance pass / fail determination unit from the image information. In order to determine whether or not the achromatic attachment member is attached at a predetermined attachment position based on the difference from the difference, that is, depending on the brightness of the installation location of the wire harness appearance inspection device In response to the lightness value or the average lightness value of the various mounting members that shift, the pass / fail is determined based on the lightness value or the average lightness value of the set surface where the magnitude of the lightness value is shifted. , Determining pass / fail of the appearance of the wire harness without being affected by the change in brightness of the installation location of the wire harness appearance inspection device Can, as a result, omission of the illumination, or lighting may be a simple configuration.

FIG. 1A is a block diagram schematically illustrating the configuration of a wire harness appearance inspection apparatus according to an embodiment of the present invention, and FIG. 1B is a diagram illustrating image information acquired by an imaging unit. . FIG. 2 is a top view of the wire harness set on the set surface. FIG. 3 is a diagram illustrating average brightness values of the set surface and the achromatic attachment members that change depending on the brightness of the installation location of the wire harness appearance inspection apparatus. FIG. 4 is a flowchart showing an overall flow of the appearance pass / fail determination process performed by the control unit. FIG. 5 is a flowchart showing the pass / fail criterion data acquisition process of FIG. FIG. 6 is a flowchart showing a pass / fail determination result acquisition process for each mounting member of the inspection product in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a wire harness appearance inspection apparatus according to the present invention will be described in detail with reference to the drawings.

FIG. 1A is a block diagram schematically showing a configuration of a wire harness appearance inspection apparatus 1 according to an embodiment of the present invention, and FIG. 1B shows image information D acquired by an imaging unit 20. FIG. In addition, the code | symbol C and code | symbol P attached | subjected to (b) have shown the attachment members C and P in the image information D. FIG. FIG. 2 is a top view of the wire harness WH set on the set surface 10a.
The wire harness appearance inspection apparatus 1 according to the embodiment of the present invention inspects the appearance of a wire harness WH that connects various electrical components mounted on an automobile.

First, the wire harness WH will be described.
The wire harness WH is configured by converging a plurality of electric wires W with a tape or the like and attaching attachment members such as a connector, a corrugated tube, a clamp, a grommet, and a protector to the converged electric wires W.

The wire harness WH of this embodiment has a connector c, a clamp C, and a protector P as attachment members as shown in FIG.
Moreover, the attachment member used as an external appearance inspection object in the wire harness WH of this embodiment is a clamp C and a protector P which are so-called exterior materials.
Moreover, since the clamp C is black and the protector P is white, the attachment members C and P to be inspected are achromatic.
Note that the attachment member to be subjected to the appearance inspection may be another attachment member such as a connector, a corrugated tube, or a tape as long as it is an achromatic color.

Next, the wire harness appearance inspection apparatus 1 will be described.
As shown in FIG. 1, the wire harness appearance inspection apparatus 1 includes a routing board 10 having a set surface 10 a that is a surface on which the wire harness WH is set, an imaging unit 20 that images the wire harness WH on the set surface 10 a, and A display unit 30 that displays information about the apparatus such as an appearance inspection result, and a control unit 40 that controls each part of the wire harness appearance inspection apparatus 1 such as the imaging unit 20 and the display unit 30.

The routing board 10 functions as a work table for manufacturing the wire harness WH and as an inspection table for inspecting the appearance of the wire harness WH.
The set surface 10a is a surface on the side of the wiring board 10 on which the wire harness WH is set, and forms a white flat surface.
With such a routing board 10, the wire harness WH is manufactured while holding each part of the electric wire W or the mounting members C and P at a predetermined position on the set surface 10a by a holding member (not shown) provided on the set surface 10a. Is done.
Moreover, the wire harness WH can perform an external appearance test | inspection, hold | maintaining on the set surface 10a, when the attachment operation | work of the attachment members C and P is completed.

The imaging unit 20 is a camera having a CCD image sensor or a CMOS image sensor. The imaging unit 20 is electrically connected to the control unit 40 and outputs captured image information D to the control unit 40. The image information D output to the control unit 40 is stored in the storage unit 42 described later.
Note that the image information D captured by the imaging unit 20 includes the image information Ds of the set surface 10a.
Moreover, the imaging part 20 can acquire the image information of the wire harness WH in a wide range by moving the routing board 10 relative to the imaging part 20 by a driving device (not shown).
Note that the imaging unit 20 may move the imaging unit 20 itself relative to the routing board 10.

  The display unit 30 is a display device such as a so-called liquid crystal display, and is electrically connected to the control unit 40. The display unit 30 displays information output from the control unit 40. More specifically, the display unit 30 displays the appearance inspection determination result information output by the control unit 40.

  The control unit 40 is realized by a CPU or the like, and controls processing and operation of each unit of the wire harness appearance inspection apparatus 1. The control unit 40 includes an appearance acceptance / rejection determination unit 41 and a storage unit 42.

  The appearance acceptance / rejection determination unit 41 acquires the average brightness value of the set surface 10a from the image information D of the wire harness WH acquired by the imaging unit 20, and the respective attachment regions of the various attachment members C and P of the image information D Based on the magnitude of the difference between the average brightness value of the set surface 10a and the average brightness value of the attachment area image information D1, D2, D3, D4 from the image information D1, D2, D3, D4. Then, it is determined whether or not the achromatic attachment members C and P are attached to a predetermined attachment position.

More specifically, the average brightness value of the set surface 10a acquired by the appearance acceptance determination unit 41 from the image information D is calculated by averaging a plurality of brightness values of the set surface 10a acquired from the image information D.
Further, the average brightness values of the attachment area image information D1, D2, D3, and D4 acquired by the appearance acceptance / rejection determination unit 41 from the image information D are more specifically acquired from the attachment area image information D1, D2, D3, and D4. It is calculated by averaging a plurality of brightness values.
Here, the attachment area image information D1, D2, D3, D4 is an image of an area in which the attachment members C, P are attached, and when the attachment members C, P are correctly attached, Although it becomes image information, when other attachment members are attached, it becomes image information of other attachment members.

In this embodiment, the appearance acceptance / rejection determination unit 41 acquires the average brightness value of the set surface 10a. However, since the set surface 10a is a flat surface, it is difficult to vary the brightness value. Based on the magnitude of the difference between one brightness value of 10a and the average brightness value of the attachment area image information D1, D2, D3, and D4, the achromatic attachment members C and P are attached at predetermined attachment positions. You may make it determine whether it exists.
In this embodiment, the appearance acceptance / rejection determination unit 41 acquires the average brightness value of the attachment area image information D1, D2, D3, and D4, but one of the attachment area image information D1, D2, D3, and D4. Based on the magnitude of the difference between the two brightness values and the brightness value or the average brightness value of the set surface 10a, it is determined whether or not the achromatic attachment members C and P are attached at a predetermined attachment position. It doesn't matter.

Here, the brightness values of the set surface 10a, the protector P, and the clamp C when the brightness of the installation location of the wire harness appearance inspection apparatus 1 is different will be described with reference to FIG.
FIG. 3 is a diagram illustrating the average brightness value of the set surface 10a and the achromatic attachment members C and P that change depending on the brightness of the installation location of the wire harness appearance inspection apparatus 1. In FIG. 3, the vertical axis represents the lightness value, and the lightness values of the white set surface 10 a, the white protector P, and the black clamp C are illustrated in order from the left in the horizontal axis. Moreover, the broken line shows the average brightness value of the set surface 10a, and the solid line shows the average brightness value of the mounting members C and P.
Moreover, (a) of FIG. 3 is a graph when the installation place of the wire harness appearance inspection apparatus 1 is brighter than (b).

As shown in FIG. 3, when the installation location of the wire harness appearance inspection apparatus 1 is dark (see FIG. 3B), the average brightness value of each of the mounting members C, P is bright (FIG. 3A )) Is smaller than the average brightness value. That is, since the average brightness value of each attachment member C and P will change if the brightness of an installation place differs, it is difficult to determine the pass / fail of attachment of each attachment member C and P only by an average brightness value.
For this reason, when the magnitude | size of the difference of the average brightness value of the set surface 10a and the average brightness value of each attachment member C and P is compared with (a) and (b), a change is hardly seen.
This is because the brightness value of the set surface 10a is shifted in correspondence with the average brightness value of various mounting members whose size is shifted depending on the brightness of the installation location of the wire harness appearance inspection apparatus 1. This is because.
Accordingly, by associating the magnitude of the difference between the average brightness value of the set surface 10a and the average brightness value of each of the mounting members C and P with each of the mounting members C and P, whether or not the mounting members C and P are attached can be determined. Judgment is made.

More specifically, when the difference in average brightness between the white set surface 10a and the black clamp C is A and the difference in average brightness between the white set surface 10a and the white protector P is B, these Difference A and difference B are used as criteria for acceptance.
That is, when the difference between the average brightness value acquired from the attachment area image information D3 and D4 of the clamp C and the average brightness value of the set surface 10a is A, it is determined that the clamp C is correctly attached.
On the other hand, if the difference between the average brightness value acquired from the attachment area image information D3 and D4 of the clamp C and the average brightness value of the set surface 10a is other than A, it is determined that the clamp C is not correctly attached.

For the protector P, the pass / fail judgment is performed in the same manner as the clamp C. That is, when the difference between the average brightness value acquired from the attachment area image information D1 and D2 of the protector P and the average brightness value of the set surface 10a is B, it is determined that the protector P is correctly attached.
On the other hand, when the difference between the average brightness value acquired from the attachment area image information D1 and D2 of the protector P and the average brightness value of the set surface 10a is other than B, it is determined that the protector P is not correctly attached.

  It should be noted that the difference value used as a criterion is not fixed to a single value such as A or B, but has a predetermined range in the magnitude of the difference such as A ± a and B ± b. Also good. However, it is adjusted so that the range of the difference between each other overlaps.

  The storage unit 42 includes a hard disk that magnetically stores information, and a memory that reads and stores various programs related to this process from the hard disk when the wire harness appearance inspection apparatus 1 executes the process.

Next, the appearance pass / fail determination process performed by the control unit will be described using the flowcharts shown in FIGS.
FIG. 4 is a flowchart showing the overall flow of the appearance pass / fail determination process performed by the control unit 40. FIG. 5 is a flowchart showing the pass / fail criterion data acquisition process of FIG. FIG. 6 is a flowchart showing a pass / fail determination result acquisition process for each mounting member of the inspection product in FIG.

First, the overall flow of the appearance pass / fail determination process performed by the control unit 40 will be described with reference to FIG.
First, the control unit 40 performs a pass / fail criterion data acquisition process (step S100). In this pass / fail judgment reference data acquisition process, the difference between the average brightness value of the set surface 10a and the average brightness value of each of the mounting members C and P as described above in a state where the acceptable product of the wire harness WH is set on the set surface 10a. And the attachment members C and P are associated with each other to obtain pass / fail judgment reference data for attachment of the attachment members C and P.

Thereafter, the operator sets the inspection-use wire harness WH on the set surface 10a, and starts the inspection when the control unit 40 receives an inspection start signal by, for example, an inspection start switch operation by the operator (step S200). : Yes), the process proceeds to step S300.
On the other hand, when the control unit 40 does not receive the inspection start signal (step S200: No), the control unit 40 waits until the inspection start signal is received.

  In step S300, the control unit 40 performs a pass / fail determination result acquisition process for each attachment member of the inspection product (step S300). In the pass / fail judgment result acquisition processing of each attachment member of the inspection product, it is determined whether or not each attachment member C, P of the wire harness WH of the inspection product is attached to a predetermined attachment position.

  Thereafter, the control unit 40 outputs a pass / fail determination result to the display unit 30 (step S400). Thereby, an operator confirms on the monitor whether each attachment member C and P of the wire harness WH is attached to the predetermined attachment position, and when an unacceptable attachment member C and P is confirmed. Deal with by reattaching the mounting members C and P.

  Thereafter, the control unit 40 returns the process to step S200 and repeats the above-described process.

Next, the pass / fail criterion data acquisition process performed by the control unit 40 will be described with reference to FIG.
In addition, before this acceptance / rejection determination reference data acquisition process, a wire harness WH that has passed the appearance inspection is set in advance on the set surface 10a.

  First, the control part 40 acquires the image information D of the accepted wire harness WH on the set surface 10a including the set surface 10a (step S101). Here, when the control part 40 moves the routing board 10, the imaging part 20 acquires the image information D of the wire harness WH in a wide range.

  Thereafter, the appearance pass / fail determination unit 41 of the control unit 40 determines a pass / fail determination reference value for each of the attachment members C and P (step S102). Here, the appearance acceptance / rejection determination unit 41 calculates the difference between the average value of the plurality of brightness values for each of the mounting members C and P and the average value of the plurality of brightness values of the set surface 10a. It is determined as a pass / fail criterion value for the attachment members C and P.

  As the acceptance criterion data, the difference between the average brightness value of the set surface 10a and the average brightness value of the black clamp C is A, and the average brightness value of the set surface 10a and the average brightness value of the white protector P are Since the difference is B, A is determined as a criterion value for determining whether the clamp C is accepted and B is determined as a criterion value for determining whether the protector P is acceptable.

  Thereafter, the appearance pass / fail determination unit 41 of the control unit 40 associates the attachment members C and P with the pass / fail determination reference values of the attachment members C and P and stores them in the storage unit (step S103), and the processing in FIG. The process returns to the appearance pass / fail judgment process shown.

Next, the pass / fail judgment result acquisition procedure for each mounting member of the inspection product performed by the control unit 40 will be described with reference to FIG.
When the control unit 40 receives the inspection start signal in step S200 described above, the control unit 40 starts the appearance inspection of the wire harness WH of the inspection product set on the set surface 10a, and then the inspection product on the set surface 10a including the set surface 10a. The image information D of the wire harness WH is acquired (step S301).

  After that, the average brightness value of the set surface 10a and the average brightness values of the attachment area image information D1 and D2 of one attachment member P are calculated from the image information D acquired by the appearance acceptance / rejection determination unit 41 of the control unit 40 (step S302). ). Here, for example, a plurality of brightness values are acquired from the attachment region image information D1 of the protector P, and the average brightness value is calculated.

  Thereafter, the appearance acceptance / rejection determination unit 41 of the control unit 40 calculates the difference between the average brightness value of the one attachment region image information D1 and the average brightness value of the set surface 10a (step S303).

  Thereafter, the appearance pass / fail determination unit 41 of the control unit 40 determines whether or not the attachment members C and P are correctly attached from the calculated difference value, and stores the pass / fail determination result in the storage unit 42 (step S304). .

  Thereafter, the control unit 40 determines whether or not pass / fail determination results have been acquired for all the attachment members C and P (step S305).

  When the control unit 40 acquires pass / fail judgment results for all the attachment members C and P (step S305: Yes), that is, when the pass / fail judgment results of the clamp C and the protector P are acquired, the process is illustrated in FIG. The process returns to the appearance pass / fail judgment process.

On the other hand, when all the pass / fail determination results have not been acquired (step S305: No), the control unit 40 returns the process to step S302 and performs the above-described process.

  In the wire harness appearance inspection apparatus 1 according to the embodiment of the present invention, the average brightness value of the set surface 10a and the average brightness value of the attachment region image information D1, D2, D3, and D4 calculated by the appearance pass / fail determination unit 41 from the image information D. Since it is determined whether or not the achromatic attachment members C and P are attached to a predetermined attachment position based on the difference between them, that is, depending on the brightness of the installation place of the wire harness appearance inspection apparatus 1 Corresponding to the average brightness value of the various mounting members whose size is shifted, the pass / fail judgment is made based on the average brightness value of the set surface 10a whose brightness value is shifted. Whether or not the appearance of the wire harness WH can be determined without being affected by the change in brightness of the installation location of the apparatus 1 results in omission of illumination or illumination. It can be a simple configuration.

  Moreover, since the wire harness appearance inspection apparatus 1 according to the embodiment of the present invention uses the average brightness value as the brightness value of the set surface 10a, even if the set surface 10a is a curved surface, the appearance pass / fail determination unit 41. It can be determined whether or not the achromatic attachment members C and P are attached to a predetermined attachment position.

  In addition, although the wire harness external appearance inspection apparatus 1 which concerns on the Example of this invention illustrated what has the set surface 10a white, it is not restricted to this, The achromatic attachment members C and P and the brightness of the lightness which can be judged by pass / fail Other colors may be used as long as they are different colors. For example, when there are two types of attachment members to be inspected, dark gray and black, the set surface 10a may be light gray.

  Moreover, although the wire harness external appearance inspection apparatus 1 which concerns on the Example of this invention illustrated what has the set surface 10a in a plane, not only this but a curved surface may be sufficient. When the set surface 10a is a curved surface, the average brightness value is always used as the brightness value.

  Moreover, although the wire harness external appearance inspection apparatus 1 which concerns on the Example of this invention illustrated what does not provide illumination to the wire harness external appearance inspection apparatus 1 itself, it is not restricted to this, Illumination is performed to the wire harness external appearance inspection apparatus 1 itself. You may make it provide. Even in this case, it is possible to determine whether or not the achromatic attachment members C and P are attached to a predetermined attachment position only by providing simple illumination.

  Moreover, although the wire harness external appearance inspection apparatus 1 which concerns on the Example of this invention illustrated what inspected the external appearance only of the achromatic attachment members C and P, it is not restricted to this, Both achromatic and chromatic attachment You may inspect the appearance of the member. In this case, the present invention is applied to the appearance inspection of the achromatic attachment member.

  The invention made by the present inventor has been specifically described based on the above-described embodiments of the invention. However, the present invention is not limited to the above-described embodiments of the invention and does not depart from the gist thereof. Various changes can be made.

DESCRIPTION OF SYMBOLS 1 Wire harness external appearance inspection apparatus 10 Arrangement board 10a Set surface 20 Imaging part 30 Display part 40 Control part 41 Appearance pass / fail judgment part 42 Storage part D, Ds Image information D1, D2, D3, D4 Attachment area image information WH Wire harness W Electric wire c Connector C Clamp (Mounting member)
P protector (mounting member)

Claims (1)

Various setting members of the wire harness are predetermined from a set surface that is a surface for setting the wire harness, an imaging unit that images the wire harness on the set surface, and image information of the wire harness acquired by the imaging unit. An external appearance pass / fail determination unit that determines whether or not it is attached to the attachment position of the wire harness,
The image information is
Including image information of the set surface,
The appearance pass / fail judgment unit
The lightness value or the average lightness value of the set surface is acquired from the image information, and the lightness value or the average lightness value is acquired from within each attachment region image information of the various attachment members of the image information, and the set Whether or not the achromatic attachment member is attached at a predetermined attachment position based on the magnitude of the difference between the lightness value or average lightness value of the surface and the lightness value or average lightness value of the attachment region image information The wire harness appearance inspection apparatus characterized by determining.

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