JP2006038778A - Defect marking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a defect marking device applying marking to a defective portion detected by an inspection device of a lengthy sheet-like product carried in the longitudinal direction, only in one position without damaging the sheet-like product, so that removal or repair of the defective portion is easily performed in an after process. <P>SOLUTION: In this device for applying marking to a detect portion of the lengthy sheet-like product carried in the longitudinal direction, which is detected by the inspection device, on the downstream side in the carrying direction from the inspection device, the marking is performed by use of a solid coloring material or pressure ballpoint pen. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a defect marking apparatus. More specifically, the present invention detects a defect in a long sheet-shaped product conveyed in the length direction by an inspection device, and marks the detected defect portion without damaging the sheet-shaped product. The present invention relates to a defect marking apparatus capable of easily removing or repairing a defective portion in a process.

In the manufacturing process of long sheet-like products such as synthetic resin films and sheets, defects are automatically detected by the inspection device in the process of transporting the sheet-like product and detected on the downstream side in the transport direction. The marking is applied to the defective portion, and the defective portion is removed or repaired with the goal of marking in a later process. Defect detection and marking is performed by processing an image obtained by an imaging means such as a CCD to recognize the defect, and depending on the conveyance speed of the sheet-like product and the size of the defect, it is further downstream in the conveyance direction than the inspection device. This is done by operating a certain marking device and marking the defective part parallel to the longitudinal direction of the sheet-like product. With the advancement of imaging means and computers, it has become easy to accurately determine the marking position, but since marking on sheet-like products has to rely on physical means, there are still many problems and various Marking means are being tried.
For example, when cutting a sheet-shaped product to cut out a section having a certain shape, the sheet-shaped product can reliably guarantee that the section does not contain any defects and can suppress a decrease in yield. As a defect marking method, a defect marking method for a sheet-like product in which a defect portion is marked at a position in the vicinity of a predetermined range on both sides in the width direction is proposed, and the defect portion is marked with a felt pen or ink jet A method using a marker of the type is described (Patent Document 1). However, according to this method, it is necessary to mark a single defect at two places on the sheet-like product. In addition, felt pens are liable to deteriorate the writing quality due to evaporation of the solvent, and it is difficult to use the felt pens stably even if they are covered with caps. Inkjet systems also tend to cause clogging of the head when fast-drying ink is used, and the head tip needs to be cleaned frequently. There is also a problem that the working environment deteriorates due to evaporation of the solvent.
Since the laser marking system is extremely expensive and large in size, a system in which a stage is provided and one head is moved in the width direction of the sheet-like product has been studied. However, there are multiple defects on the same scanning line. If there is a problem, it is not possible to mark all of them. In addition, a method of applying a thermosetting resin or an ultraviolet curable resin to a defective portion of a sheet-like product has been studied. However, it is difficult to heat or irradiate ultraviolet rays in a short time to cure the applied resin on a sheet-like product conveyed at high speed. The method of deforming a defective part by applying a heat source such as a soldering iron has a large damage to the sheet-like product.
As a marking method in which the marked ink does not bleed or disappear, there has been proposed a method of scratching a defective portion of a sheet-like product using a grindstone material or the like (Patent Document 2). In addition, as a method of clearly indicating the defects that the sheet-like material has by marking, using a marking tool made of a material having a high hardness or a blade on the surface opposite to the side having the defects, the blade scratches, cutting marks, or wear marks are removed. A method of attaching is proposed (Patent Document 3). However, if the sheet-like product is damaged, the strength of the portion is lowered, and an accident such as breakage is likely to occur in the subsequent processing steps. In addition, if the sheet-like product is damaged, swarf is always generated, and if the swarf is caught in the product, the quality of the product deteriorates, and a special suction is used to completely remove the generated swarf. Requires equipment and increases costs.
JP 2001-305070 A (page 5) JP 2002-303580 A (2nd page, 5th page) JP 2002-338111 A (2nd page)

  In the present invention, a defect in a long sheet product conveyed in the length direction is detected by an inspection device, and marking is performed only at one place without damaging the sheet product in the detected defect portion. The object of the present invention is to provide a defect marking apparatus that can easily remove or repair a defective part in a subsequent process.

As a result of intensive studies to solve the above-mentioned problems, the present inventors made a marking on the defective portion of the sheet-like product using a solid coloring material or a pressure ballpoint pen, thereby evaporating or writing the solvent. There is no problem of deterioration of taste, no damage to the sheet-like product, and the sheet-like product can be marked stably and difficult to disappear, and a solid colored material or a pressure ballpoint pen can be applied in the width direction of the sheet-like product. When a defect is detected, a defective portion is reliably removed at the time of product cutting by marking at one place with a coloring material or a ballpoint pen closest to the defect in the width direction. Based on this finding, the present invention has been completed.
That is, the present invention
(1) In an apparatus for detecting a defect in a long sheet-shaped product conveyed in the length direction by an inspection apparatus and marking a defect portion detected downstream of the inspection apparatus in the conveyance direction, solid coloring Defect marking device characterized by marking with material,
(2) The defect marking device according to (1), wherein the solid coloring material is a rod-shaped marking chalk made of a brazing material containing a dye or pigment,
(3) The defect marking device according to (1), wherein the solid coloring material is an oil-based colored pencil,
(4) When a large number of solid colored materials are arranged at equal intervals in the width direction of the sheet-like product and a defect is detected by the inspection device, the solid colored material closest to the defect moves in the width direction to perform marking. (1) Defect marking device according to
(5) The defect marking device according to (1), wherein the sheet-like product is an optical film or sheet for liquid crystal, and
(6) A pressure ballpoint pen in an apparatus for detecting a defect in a long sheet-like product conveyed in the length direction by an inspection apparatus and marking a defect portion detected downstream of the inspection apparatus in the conveyance direction. Defect marking device, characterized by marking by
Is to provide.
Furthermore, as a preferred embodiment of the present invention,
(7) The defect marking device according to (1), wherein the inspection device is a line sensor,
(8) When a plurality of pressure ballpoint pens are arranged at equal intervals in the width direction of the sheet-like product and a defect is detected by the inspection device, the pressure ballpoint pen closest to the defect moves in the width direction to perform marking ( 6) Defect marking device according to
(9) The defect marking apparatus according to (6), wherein the sheet-like product is an optical film or sheet for liquid crystal, and
(10) The defect marking device according to (6), wherein the inspection device is a line sensor,
Can be mentioned.

  Since the defect marking device of the present invention uses a solid coloring material or a pressurized ballpoint pen, there are no problems such as deterioration in writing quality due to evaporation of the solvent, clogging of the nozzle head, and deterioration of the working environment, and in the width direction of the sheet-like product. On the other hand, a large number of coloring materials or ballpoint pens can be installed at narrow intervals, the markings are difficult to disappear due to rubbing or the like, the sheet-like product is not damaged, and shavings are not generated. In addition, when a large number of solid colored materials or pressurized ballpoint pens are arranged at equal intervals and a defect is detected, marking is performed with the colored material or ballpoint pen closest to the defect in the width direction. Further, by removing the space between the coloring material or the ballpoint pen, it is possible to surely exclude the defective portion from the cut out product.

The first aspect of the defect marking apparatus of the present invention is to detect a defect in a long sheet-shaped product conveyed in the length direction by an inspection apparatus, and detect a defect portion detected downstream of the inspection apparatus in the conveyance direction. Is a device for marking with a solid coloring material.
According to a second aspect of the defect marking apparatus of the present invention, a defect in a long sheet-like product conveyed in the length direction is detected by an inspection apparatus, and the defect portion detected on the downstream side in the conveyance direction from the inspection apparatus. In the apparatus for marking, the marking is performed by a pressure ballpoint pen.
FIG. 1 is an explanatory view of one aspect of the defect marking apparatus of the present invention. The sheet-like product 1 is conveyed in the direction of the arrow. The sheet-like product is imaged by the CCD camera 2 and image processing is performed by the inspection device 3. When a defect is detected in the sheet-like product, a signal is sent from the inspection device 3 to the driving device 4, the solenoid 5 is actuated, the solid coloring material 6 is pushed down, and the sheet-like material conveyed on the support roll 7. Marking is made at a predetermined position of the product.
FIG. 2 is a side view and a top view showing an arrangement of solid coloring materials according to another embodiment of the device of the present invention. In this embodiment, solid coloring materials 6 driven by a large number of solenoids are arranged at equal intervals over the entire width of the sheet-like product. When a defect is detected in the inspection apparatus, the solid coloring material closest to the defect is pushed down by the solenoid in the width direction of the sheet-like product, and marking is performed. The marking length is calculated in the image processing apparatus so as to have a preset value. When the sheet-like product has a long defect, a plurality of markings are intermittently applied.

  In the apparatus of the present invention, when the defect can be visually recognized using the marking applied to the defective portion as an index, the defective portion is removed or repaired in the post-processing step. FIG. 3 is an explanatory diagram of the defect marking mechanism of the apparatus of the present invention. In this apparatus, a large number of solid coloring materials A, B, C, D,... Are arranged at equal intervals d (mm). When the defect 9 is detected in the long sheet-like product 8 by the inspection device, the solid coloring material B closest to the defect in the width direction is pushed down on the downstream side of the conveyance direction from the inspection device, and the sheet-like product is marked. 10 is applied. Since the solid coloring material closest to the defect is pushed down in the width direction, the distance between the marking and the defect is d / 2 (mm) or less. If the defect cannot be visually recognized, the portion of the rectangle 11 having a length of the marking length a (mm) and a width of d / 2 (mm) apart on both sides of the marking is removed. . Since defects always exist inside the rectangle, the apparatus of the present invention applies only one marking, and removes a portion equal to the interval of the solid coloring material with the marking at the center, thereby ensuring the defect portion. Can be removed.

There is no restriction | limiting in particular in the solid coloring material used for this invention apparatus, For example, the color core of a pencil, marking chalk, an oil-based color pencil, a lipstick, a crayon, chalk etc. can be mentioned. Solid coloring materials should be used stably from the beginning without any problems such as deterioration of writing taste due to evaporation of the solvent, clogging of the nozzle head, contamination of the work environment, etc. like liquid coloring materials using solvents. Can do. The solid coloring material can be directly attached to the apparatus and does not require any additional equipment such as a drying apparatus unlike the liquid coloring material. In addition, according to the solid coloring material, the sheet-like product is not damaged such as blade scratches, cutting marks, and wear marks, so that there is no possibility of causing an accident such as breakage in the subsequent process.
Among solid coloring materials, marking chalk and oil-based colored pencils made of a brazing material containing a dye / pigment can be used particularly suitably because many sheet-like products can be marked with less scratching due to rubbing or the like. be able to. Such solid coloring materials include marking chalk [Kuretake Seisho Co., Ltd., trade name], Dermatograph [Mitsubishi Pencil Co., Ltd., registered trademark], marking graph [Tonbo Pencil Co., Ltd., trade name], etc. Is commercially available. There are no particular restrictions on the marking chalk brazing material, for example, plant wax such as carnauba wax, wood wax, sugar wax, animal wax such as beeswax, insect wax, whale wax, wool wax, petroleum oil such as paraffin wax, microcrystalline wax, etc. Examples thereof include mineral waxes such as wax, montan wax, ozokerite, and synthetic waxes such as carbowax, polyethylene wax, and chlorinated naphthalene wax. There are no particular restrictions on the color of the marking chalk or oil-based colored pencil to be used, and choose a color that can be easily identified visually, depending on the color of the sheet-like product, from black, red, blue, green, yellow, white, etc. Is preferred.

  In the defect marking device of the present invention, when a defective portion of a sheet-like product is marked with a pressurized ballpoint pen that is filled with compressed air and pushes out ink, the sheet-like product is not damaged by slight pressure, and there is no clear line breakage. Marking can be applied. As the pressure ballpoint pen, it is preferable to use a replacement core of the pressure ballpoint pen. Since oil-based pigment ink is used for pressurized ballpoint pens, there are problems such as poor writing due to evaporation of solvents such as liquid coloring materials using solvents, clogging of the nozzle head, and contamination of the work environment. Absent. Further, since the replacement core of the pressurized ballpoint pen is formed from a metal tube or the like, it has higher rigidity than a solid coloring material and can be reduced in diameter. Therefore, a large number can be arranged by shortening the distance between adjacent pressure ball-point pens, and when the defective part is marked, the part to be removed of the sheet-like product can be made small.

In the apparatus of the present invention, it is preferable that a large number of solid coloring materials or pressure ballpoint pens are arranged at equal intervals in the width direction of the sheet-like product, and the interval is preferably 30 mm or less, and 15 mm or less. It is more preferable. The portion to be removed can be reduced by shortening the interval between the solid coloring material or the pressure ballpoint pen. Since the solid coloring material or the pressure ballpoint pen does not require an accessory facility unlike the liquid coloring material, the interval between the adjacent solid coloring material or the pressure ballpoint pen can be narrowed to a position close to its thickness.
In the device of the present invention, it is preferable that marking is performed by pressing a solid coloring material or a pressure ballpoint pen of a defective portion of a sheet-like product by a solenoid. Since the solenoid responds quickly to the signal, marking corresponding to the size of the defect in the length direction can be accurately applied to the sheet-like product.
In the apparatus of the present invention, an image processing apparatus including a solid-state imaging device such as a line sensor or an area sensor can be used as the inspection apparatus.
Although there is no restriction | limiting in particular in the sheet-like product which marks a defective part using this invention apparatus, This invention apparatus can be applied especially suitably with respect to the optical film or sheet | seat for liquid crystals. An optical film or sheet for liquid crystal used for a liquid crystal display device or the like appears as unevenness of a display screen even if it is a very minute defect, and it is strictly required that there is no defect. In addition, the liquid crystal optical film or sheet is not used as a long product as a final product, but is often cut into a rectangular shape. Therefore, when a defect is found, the portion should be easily removed. Can do.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
Example 1
A biaxially stretched polyethylene terephthalate film having a width of 1,600 mm and a thickness of 50 μm was inspected. Eight CCD cameras were attached at an interval of 200 mm above the polyethylene terephthalate film, and a light source was installed below the polyethylene terephthalate film at a position facing the CCD camera. 64 oil-colored black pencils [Mitsubishi Pencil Co., Ltd., Dermatograph] actuated by a solenoid with a width of 1,600mm above the polyethylene terephthalate film 2.0m downstream from the CCD camera and the light source at 25mm intervals A support roll was provided below the marking head and the polyethylene terephthalate film at a position facing the marking head. An inspection device that processes the image of the CCD camera to detect a defect and a drive device that pushes down the marking choke closest to the defective portion for a predetermined time by a signal sent from the inspection device are connected.
The polyethylene terephthalate film was conveyed at a speed of 20 m / min, and defects were detected and marked. In 3 hours, 16 defects were detected. All the defects were fine dots, and the distance from the marking was all within 12.5 mm in the width direction.
Example 2
A biaxially stretched polyethylene terephthalate film having a width of 1,400 mm and a thickness of 100 μm was inspected. Seven CCD cameras were attached at an interval of 200 mm above the polyethylene terephthalate film, and a light source was installed below the polyethylene terephthalate film at a position facing the CCD camera. A marking head provided with 140 replacement cores of black pressure ballpoint pens operated by a solenoid within a width of 1,400 mm at intervals of 10 mm above a polyethylene terephthalate film 2.0 m downstream from a CCD camera and a light source; A support roll was provided below the terephthalate film at a position facing the marking head. An inspection device that processes the image of the CCD camera to detect a defect and a drive device that pushes down the replacement core of the pressure ballpoint pen closest to the defective portion for a predetermined time by a signal sent from the inspection device were connected.
The polyethylene terephthalate film was conveyed at a speed of 20 m / min, and defects were detected and marked. Eleven defects were detected in 3 hours. All the defects were fine dots, and the distance from the marking was all within 5 mm in the width direction.

  Since the defect marking device of the present invention uses a solid coloring material or a pressurized ballpoint pen, there are no problems such as deterioration in writing quality due to evaporation of the solvent, clogging of the nozzle head, and deterioration of the working environment, and in the width direction of the sheet-like product. On the other hand, a large number of coloring materials or ballpoint pens can be installed at narrow intervals, the markings are difficult to disappear due to rubbing or the like, the sheet-like product is not damaged, and shavings are not generated. In addition, a large number of solid colored materials or pressurized ballpoint pens are arranged at equal intervals, and when a defect is detected, marking is performed with the colored material or ballpoint pen closest to the defect in the width direction. By removing the distance between the coloring material or the ballpoint pen in the direction, the defective portion can be surely excluded from the cut out product.

It is explanatory drawing of the one aspect | mode of the defect marking apparatus of this invention. It is the side view and top view which show the arrangement | sequence of a solid coloring material. It is explanatory drawing of the defect marking mechanism of this invention apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet-like product 2 CCD camera 3 Inspection apparatus 4 Drive apparatus 5 Solenoid 6 Coloring material 7 Support roll 8 Sheet-like product 9 Defect 10 Marking 11 Rectangular

Claims (6)

  Marking with a solid coloring material in an apparatus that detects defects in a long sheet-like product conveyed in the length direction by an inspection device and marks the defective portion detected downstream of the inspection device in the conveyance direction The defect marking device characterized by giving.   2. The defect marking apparatus according to claim 1, wherein the solid coloring material is a rod-shaped marking chalk made of a brazing material containing a dye / pigment.   The defect marking apparatus according to claim 1, wherein the solid coloring material is an oil-based colored pencil.   A number of solid coloring materials are arranged at equal intervals in the width direction of the sheet-like product, and when a defect is detected by the inspection apparatus, the solid coloring material closest to the defect moves in the width direction to perform marking. The defect marking apparatus according to 1.   The defect marking apparatus according to claim 1, wherein the sheet-like product is a liquid crystal optical film or sheet.   In an apparatus that detects defects in a long sheet-like product conveyed in the length direction with an inspection device, and marks the defective portion detected downstream in the conveyance direction from the inspection device, the marking is performed with a pressure ballpoint pen. A defect marking device characterized by being applied.

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