JP2006266981A - Apparatus for marking defect - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for marking a defect, which can detect the defect in a long sheet product transferred to the longitudinal direction by using an inspection device, and can place a mark at the detected defect position by using an oil-based marking pen, without causing a decrease in the marking property due to drying of the tip of the pen. <P>SOLUTION: In the apparatus for marking the defect, which detects the defect in the long sheet product transferred to the longitudinal direction by using the inspection device and places the mark at the detected defect position on the downstream side of the inspection device in the transfer direction, the mark is placed by the oil-based marking pen contained in an oil-based marking pen containing tube which has a shutter for closing the tip of the pen, and the shutter is opened on the basis of a signal sent from the inspection device, and the mark is placed at the defect position of the sheet product by the tip of the oil-based marking pen being pushed out, and then the oil-based marking pen is pulled back after the marking is completed, and the shutter is closed. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 detects a defect portion without causing a deterioration in marking properties due to drying of the pen tip. The present invention relates to a defect marking device capable of marking using an oil-based marking pen.

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 by using the marking as an index in a subsequent 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, felt-tip pens use a quick-drying ink, and the pen tip dries in a short time, making marking difficult. When using a slow-drying ink to prevent evaporation of the solvent, the felt pen adheres to the sheet-like product. Ink tends to be transferred to manufacturing equipment and other parts of the sheet-like product, and in order to prevent the transfer, it is necessary to pass the sheet-like product through a dryer after marking. Inkjet systems also tend to cause clogging of the head when using fast-drying ink, and it is necessary to frequently clean the tip of the head. When using slow-drying ink, the sheet-like product needs to be dried.
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, an inspection apparatus detects a defect in a long sheet-shaped product conveyed in the length direction, and an oil-based marking pen is applied to the detected defect portion without causing a deterioration in marking performance due to drying of the pen tip. The present invention has been made for the purpose of providing a defect marking apparatus that can be used for marking.

As a result of intensive research to solve the above-mentioned problems, the present inventor has marked the defective part of the sheet-like product with an oil-based marking pen provided with a shutter for blocking the pen tip, and a signal sent from the inspection device Based on the above, by opening the shutter, marking by extruding the oil-based marking pen, drawing in the oil-based marking pen, and closing the shutter in this order, the pen tip of the oil-based marking pen is prevented from drying, and quick-drying ink is used. Thus, it has been found that it is possible to efficiently mark the defective portion of the sheet-like product, and the present invention has been completed based on this finding.
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 on the downstream side in the conveyance direction from the inspection apparatus, Marking is performed with an oil-based marking pen stored in an oil-based marking pen storage tube with a shutter to be sealed, and the shutter of the oil-based marking pen storage tube is opened based on a signal sent from the inspection device, and the oil-based marking pen is pushed out. A defect marking device characterized in that a defective part of a sheet-like product is marked with a pen tip, and after the marking is finished, an oil-based marking pen is drawn in and a shutter is closed,
(2) The defective marking device according to (1), wherein the shutter is opened and closed by operating an air cylinder, and the oil-based marking pen is pushed and retracted by operating a solenoid.
(3) The defect marking device according to (1), wherein the opening and closing of the shutter and the pushing and retracting of the oil-based marking pen are performed by operating separate solenoids, and
(4) The defect marking device according to (1), wherein the solvent of the ink of the oil-based marking pen contains 80% by weight or more of a non-halogen aliphatic compound having a vapor pressure at 20 ° C. of 0.5 to 10 kPa,
Is to provide.
Furthermore, as a preferred embodiment of the present invention,
(5) The defect marking device according to (1), wherein the inspection device is a line sensor, and
(6) When a large number of oil-based marking 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 oil-based marking pen closest to the defect moves in the width direction to perform marking ( 1) Defect marking device as described
Can be mentioned.

  According to the defect marking device of the present invention, since the nib of the oil-based marking pen that marks the defective portion of the sheet-like product does not dry, using a quick-drying ink, a short production line without a drying process It is possible to mark the defective portion efficiently. When the defective part in the vicinity of the marking can be recognized visually, the ink can be wiped off using a solvent and only the defective part can be removed or repaired, so the sheet-like product should be used effectively as a raw material for the final product. Can do.

  The defect marking device of the present invention is a device for detecting a defect of a long sheet-like product conveyed in the length direction by an inspection device and marking the defect portion detected downstream of the inspection device in the conveyance direction. , Marking is performed by an oil-based marking pen housed in an oil-based marking pen housing tube equipped with a shutter for blocking the pen tip, and the shutter of the oil-based marking pen housing tube is opened based on a signal sent from the inspection device, and the oil-based marking This is a defect marking device in which a pen is pushed out, a defective portion of a sheet-like product is marked by a pen tip, an oil-based marking pen is pulled in after the marking is finished, and a shutter is closed.

  In the apparatus of the present invention, the shutter can be opened and closed by operating the air cylinder, and the oil-based marking pen can be pushed out and retracted by operating the solenoid. 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 driving device is provided with a solenoid 6 that pushes out or retracts the oil-based marking pen stored in the oil-based marking pen storage tube 5 and an air cylinder 8 that opens and closes the shutter 7 of the oil-based marking pen storage tube. When a defect detection signal is sent from the inspection device to the driving device, the air cylinder 8 is activated and the shutter 7 is opened. Next, after the solenoid 6 is actuated to push out the oil-based marking pen stored in the oil-based marking pen storage tube 5, marking is performed on a predetermined position of the sheet-like product conveyed on the support roll 9. The oil-based marking pen is drawn into the oil-based marking pen housing tube, and the shutter 7 is closed by the operation of the air cylinder 8. Since the operation time of the solenoid can be set to 20 ms or less, the oil-based marking pen can be quickly pushed out and pulled in, and defects in the sheet-like product can be marked accurately. Since the operation time of the air cylinder is longer than the operation time of the solenoid, if defects are detected continuously in the sheet-like product, the shutter is kept open until the series of defect markings is completed, and the series of defect markings Close the shutter after finishing. In the time zone when no defect is detected, the oil-based marking pen is housed in the housing tube to prevent the pen tip from drying, so that a fast-drying ink can be used.

  In the device of the present invention, the opening and closing of the shutter and the pushing and pulling of the oil-based marking pen can be performed by operating separate solenoids. FIG. 2 is an explanatory view of another 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 driving device is provided with a solenoid 6 that pushes out or retracts the oil-based marking pen stored in the oil-based marking pen storage tube 5 and a solenoid 11 that opens and closes the shutter 10 of the oil-based marking pen storage tube. When a defect detection signal is sent from the inspection device to the driving device, the solenoid 11 is activated and the shutter 10 is opened. Next, after the solenoid 6 is actuated to push out the oil-based marking pen stored in the oil-based marking pen storage tube 5, marking is performed on a predetermined position of the sheet-like product conveyed on the support roll 9. The oil-based marking pen is drawn into the oil-based marking pen storage tube, and the shutter 10 is closed by the operation of the solenoid 11. Since the operation time of the solenoid can be 20 ms or less, the shutter of the oil-based marking pen storage tube is opened by opening and closing the shutter and pushing and retracting the oil-based marking pen by operating separate solenoids. Time can be shortened, the nib can be prevented from drying, and a quick-drying ink can be used.

In the apparatus of the present invention, there is no particular limitation on the moving direction of the oil-based marking pen. For example, the oil-based marking pen can be configured to be drawn upward after marking the sheet-like product by descending from above. It can also be configured to be drawn after the pen moves horizontally to mark the sheet-like product, and the oil-based marking pen rises from below to mark the sheet-like product and then drawn downward Alternatively, the direction in which the oil-based marking pen moves can be any angle other than vertical or horizontal. In the case where the oil-based marking pen is pushed out and retracted by actuation of a solenoid, the force for pulling the oil-based marking pen is a spring, and therefore the movement of the oil-based marking pen is preferably in the horizontal direction.
In the apparatus of the present invention, there is no particular limitation on the position at which the sheet-shaped product is marked with the oil-based marking pen, for example, the marking can be performed on the tangent line between the sheet-shaped product and the support roll that conveys the sheet-shaped product, or Marking can also be performed at a position away from the tangent line between the support roll and the sheet-like product downstream or upstream. If marking is performed on the tangent line between the support roll and the sheet-shaped product, the tip of the oil-based marking pen tends to wear out, and if marking is performed at a position far from the tangent line between the support roll and the sheet-shaped product, stable marking becomes difficult. Therefore, the position to be marked is preferably 1 to 10 mm away from the tangent line of the support roll and the sheet-like product, and more preferably 3 to 8 mm away.

  In the apparatus of the present invention, the solvent of the oil-based marking pen ink preferably contains 80% by weight or more of a non-halogen aliphatic compound having a vapor pressure at 20 ° C. of 0.5 to 10 kPa. It is more preferable that the solvent comprises only a non-halogen aliphatic compound having a vapor pressure of 3 to 9 kPa at 20 ° C. Non-halogen aliphatic compounds are inert to many plastics and can be marked without damaging the sheet product. If marking is performed using an aromatic compound or a halogenated aliphatic compound as a solvent, the sheet-shaped product may be damaged. Therefore, the solvent preferably contains 80% by weight or more of a non-halogenated aliphatic compound. When the vapor pressure of the solvent at 20 ° C. is less than 0.5 kPa, the drying of the ink is slow, and the ink is transferred to other parts of the manufacturing apparatus or the sheet-like product or needs to be dried, resulting in a complicated and long production line. There is a fear. If the vapor pressure of the solvent at 20 ° C. exceeds 10 kPa, the pen tip may be dried by evaporation of the solvent even if the oil-based marking pen storage tube is provided with a shutter.

  Examples of the non-halogen aliphatic compound having a vapor pressure at 20 ° C. of 0.5 to 10 kPa include heptane (4.7), octane (1.5), nonane (0.67), and methylcyclohexane (4. 9) hydrocarbons, ethanol (6.0), propanol (1.9), isopropyl alcohol (4.3), butyl alcohol (0.73), isobutyl alcohol (1.2), sec-butyl alcohol ( 1.7), alcohols such as t-butyl alcohol (4.1), ethylene glycol monomethyl ether (1.1), ethylene glycol monoisopropyl ether (0.80), propylene glycol monomethyl ether (1.0), ethylene Glycol ethers such as glycol diethyl ether (1.3), methyl ethyl ketone (9.3), methyl propyl keto (1.6), methyl butyl ketone (1.6), methyl isobutyl ketone (2.1), ketones such as dipropyl ketone (0.69), butyl formate (2.9), isobutyl formate (4.4) ), Propyl acetate (3.3), isopropyl acetate (6.4), butyl acetate (1.1), isobutyl acetate (1.7), ethyl propionate (3.7), butyl propionate (6.0) ) And the like. Of these, alcohols and glycol ethers can be particularly preferably used. In addition, the numerical value in the parenthesis attached to the compound name is a value representing the vapor pressure at 20 ° C. in units of kPa.

In the apparatus of the present invention, a mixed solvent can be used as the solvent for the ink of the oil-based marking pen. By using a solvent having a high vapor pressure at 20 ° C. as one component of the mixed solvent, it is possible to increase the vapor pressure of the solvent and impart quick drying properties to the ink. Examples of the solvent having a high vapor pressure at 20 ° C. include methanol (12.8) and acetone (24.5). The vapor pressure of the mixed solvent can be obtained from a constant temperature and constant pressure gas-liquid equilibrium relationship.
In the apparatus of the present invention, pentaerythritol fatty acid ester can be added to the ink of the oil-based marking pen. By adding a pentaerythritol fatty acid ester to the ink of the oil-based marking pen, it is possible to prevent the nib from being dry and to provide a stable marking without fading.

The oil-based marking pen used in the apparatus of the present invention is written on a glass plate by hand writing five times in a spiral manner, and after 20 seconds, a white paper with a whiteness of 75% or more is overlaid, and the bottom is 50 mm in weight and 500 g in weight. It is preferable that the writing line is not transferred to the paper when the paper is released after being pressed and left for 1 minute, and similarly, the writing line is not transferred when the writing paper is pressed after 10 seconds. More preferably, similarly, it is further preferable that the writing line is not transferred when the writing paper is pressure-bonded after 4 seconds.
There is no restriction | limiting in particular in the material of the pen point of the oil-based marking pen used for this invention apparatus, Either a fiber pen point or a plastic nib can be used. Although there is no restriction | limiting in particular in the thickness of the pen point of an oil-based marking pen, It is preferable that the width | variety of the recorded line | wire is 0.3-2.5 mm, and it is more preferable that it is 1-2 mm. If the recorded line width is less than 0.3 mm, the marking may be unclear. If the recorded line width exceeds 2.5 mm, the writing distance may be shortened. There is no restriction | limiting in particular in the color of the oil-based marking pen used for this invention apparatus, According to the color of the sheet-like product to test | inspect, the color which is easy to recognize visually can be selected suitably.

In the apparatus of the present invention, when a large number of oil-based marking 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 oil-based marking pen closest to the defect moves in the width direction for marking. It is preferable to apply. 3A and 3B are a side view and a top view showing an arrangement of oil-based marking pen storage tubes according to another embodiment of the device of the present invention. In this embodiment, a shutter driven by a large number of air cylinders or solenoids and an oil-based marking pen storage tube 5 storing oil-based marking pens driven by a large number of solenoids are arranged at equal intervals over the entire width of the sheet-like product. ing.
When a defect is detected in the inspection device, the shutter of the oil-based marking pen storage tube that is closest to the defect in the width direction of the sheet-shaped product is opened by the air cylinder for opening / closing the shutter or the solenoid, and the sheet-shaped by the oil-based marking pen push-in / out solenoid The oil-based marking pen closest to the defect is pushed out in the width direction of the product to be marked. The length of the marking is preferably calculated in the inspection apparatus so as to have a preset value. When the sheet-like product has a long defect, a plurality of markings can be applied intermittently.

  In the apparatus of the present invention, if 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, and if necessary, the marking is used with a solvent or the like. Can be wiped off. By wiping off the marking, the marked portion can also be used as a raw material for the final product. FIG. 4 is an explanatory diagram of the defect marking mechanism of the apparatus of the present invention. In this apparatus, pen tips A, B, C, D,... Of oil-based marking pens are arranged in a large number of oil-based marking pen storage tubes at equal intervals d (mm). When the defect 13 is detected in the long sheet-like product 12 by the inspection device, the oil-based marking pen closest to the defect in the width direction is pushed downstream from the inspection device in the transport direction, and the sheet-like product is drawn by the pen tip B. A marking 14 is applied to the. Since the oil-based marking pen closest to the defect is pushed out in the width direction, the distance between the marking and the defect is d / 2 (mm) or less. If the defect cannot be recognized by visual inspection, the length 15 is the length of the marking a (mm), and the width of the rectangle 15 consisting of lines separated by d / 2 (mm) on both sides of the marking is removed. To do. Since defects always exist inside this rectangle, the device of the present invention applies only one marking, and removes the defective portion by removing the portion equal to the distance between the oil-based marking pens with the marking at the center. can do.

  In the device of the present invention, the interval between the oil-based marking pens arranged in the width direction of the sheet-like product is preferably 30 mm or less, and more preferably 15 mm or less. By shortening the interval between the oil-based marking pens, it is possible to reduce the portion to be removed from the sheet-like product when the defective portion cannot be visually recognized. Since the oil-based marking pen does not require an incidental facility as compared with the ink-jet type marking device, the interval between the adjacent oil-based marking pens can be narrowed to a position close to the thickness of the oil-based marking pen storage tube.

  FIG. 5 is an explanatory diagram of one aspect of the defect marking method of the apparatus of the present invention. The air cylinder 8 is actuated by a signal sent from the driving device, and the shutter 7 of the oil-based marking pen storage tube is opened. Next, the oil-based marking pen push-in / out solenoid 6 is actuated to push out the oil-based marking pen 16 from the oil-based marking pen storage tube 5, and the sheet-like product 1 conveyed by the pen tip 17 is marked. When the marking is finished, the oil-based marking pen is drawn into the oil-based marking pen storage tube by the operation of the solenoid. When the oil-based marking pen is drawn, the air cylinder 8 is operated to push out the shutter 7, and the oil-based marking pen storage tube is closed.

  FIG. 6 is an explanatory view of another aspect of the defect marking method of the apparatus of the present invention. The shutter opening / closing solenoid 11 is actuated by a signal sent from the driving device, and the wire 18 is pulled to open the shutter 10 of the oil-based marking pen storage tube. Next, the oil-based marking pen push-in / out solenoid 6 is operated to push out the oil-based marking pen 19 from the oil-based marking pen storage tube 5, and the sheet-like product 1 conveyed by the pen tip 20 is marked. When the marking is finished, the oil-based marking pen is drawn into the oil-based marking pen storage tube by the operation of the solenoid 6. When the oil-based marking pen is retracted, the solenoid 11 is actuated to loosen the wire 18, the shutter is pushed out by the spring coil 21, and the oil-based marking pen storage tube is closed.

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. Among these, a line sensor can be particularly preferably used.
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 intervals of 200 mm above the polyethylene terephthalate film, and a light source was installed below the polyethylene terephthalate film at a position corresponding to the CCD camera. Above the polyethylene terephthalate film 2.0m downstream from the CCD camera and the light source, there is a storage pipe of an oil-based marking pen operated by a solenoid within a width of 1,600 mm, and a shutter of the storage pipe operated by an air cylinder. A support roll was provided at a position facing the marking head below the marking head provided with 64 combinations at 25 mm intervals and a polyethylene terephthalate film.
The solvent for the ink of the oil-based marking pen was a mixed solvent of 70% by weight of ethanol and 30% by weight of propylene glycol monomethyl ether, and the pen tip was made of fiber and was a cylinder with a thickness of 1.5 mm. The color of the ink was black by blending carbon black.
An inspection device that processes the image of the CCD camera to detect a defect and a driving device that opens the shutter of the oil-based marking pen storage tube closest to the defective portion and pushes out the oil-based marking pen are connected by a signal sent from the inspection device. The polyethylene terephthalate film was conveyed at a speed of 20 m / min, and defects were detected and marked. In 10 hours, 35 defects were detected. All the defects were fine fish eyes, and the distance from the marking was all within 12.5 mm in the width direction. Further, over 10 hours, the pen tip of the oil-based marking pen could be stably and clearly marked without drying.

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 combination of a CCD camera and a polyethylene terephthalate film 2.0 meters downstream of the light source, a storage pipe for an oil-based marking pen operated by a solenoid within a width of 1,400 mm, and a shutter for the storage pipe operated by a solenoid A support roll was provided at a position facing the marking head below the marking head provided with 70 sets at intervals of 20 mm and the polyethylene terephthalate film.
The solvent of the ink of the oil-based marking pen was ethanol, the pen tip was made of fiber, and the column shape was 1.0 mm in thickness. The color of the ink was black by blending carbon black.
An inspection device that processes the image of the CCD camera to detect a defect and a driving device that opens the shutter of the oil-based marking pen storage tube closest to the defective portion and pushes out the oil-based marking pen are connected by a signal sent from the inspection device. The polyethylene terephthalate film was conveyed at a speed of 20 m / min, and defects were detected and marked. In 10 hours, 41 defects were detected. The defects were all fine fish eyes, and the distance from the marking was all within 10 mm in the width direction. Further, over 10 hours, the pen tip of the oil-based marking pen could be stably and clearly marked without drying.

  The defect marking apparatus according to the present invention uses an oil-based marking pen as a marking material, and normally stores the oil-based marking pen in an oil-based marking pen storage pipe with a shutter closed, and performs marking by detecting defects in the sheet-like product. Only when the shutter opens, the oil-based marking pen is pushed out. Therefore, even when using quick-drying ink, the pen tip does not dry and marking defects do not occur, and the markings applied to sheet-like products dries at room temperature in a short time, so additional equipment such as drying equipment is required. However, it is possible to efficiently and economically inspect the defects of the sheet-like product. In addition, when the detected defect can be recognized visually, the marked portion can also be used as a raw material of the final product by wiping the marking with a solvent or the like.

It is explanatory drawing of the one aspect | mode of the defect marking apparatus of this invention. It is explanatory drawing of the other aspect of the defect marking apparatus of this invention. It is the side view and top view which show the arrangement | sequence of an oil-based marking pen storage pipe. It is explanatory drawing of the defect marking mechanism of this invention apparatus. It is explanatory drawing of the one aspect | mode of the defect marking system of this invention apparatus. It is explanatory drawing of the other aspect of the defect marking system of this invention apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet-like product 2 CCD camera 3 Inspection apparatus 4 Drive apparatus 5 Oil-based marking pen storage pipe 6 Solenoid 7 Shutter 8 Air cylinder 9 Support roll 10 Shutter 11 Solenoid 12 Sheet-like product 13 Defect 14 Marking 15 Rectangular 16 Oil-based marking pen 17 Pen tip 18 wire 19 oil-based marking pen 20 nib 21 spring coil

Claims (4)

  A shutter for sealing a pen tip 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 in the conveyance direction from the inspection apparatus. Marking is performed with the oil-based marking pen stored in the oil-based marking pen storage tube, and the shutter of the oil-based marking pen storage tube is opened based on the signal sent from the inspection device, and the oil-based marking pen is pushed out by the pen tip A defect marking device, wherein a defective portion of a sheet-like product is marked, and after the marking is finished, an oil-based marking pen is drawn in and a shutter is closed.   2. The defect marking apparatus according to claim 1, wherein the shutter is opened and closed by operating an air cylinder, and the oil-based marking pen is pushed and retracted by operating a solenoid.   2. The defect marking apparatus according to claim 1, wherein opening and closing of the shutter and pushing and pulling of the oil-based marking pen are performed by operating separate solenoids.   The defect marking apparatus according to claim 1, wherein the solvent of the ink of the oil-based marking pen contains 80% by weight or more of a non-halogen aliphatic compound having a vapor pressure at 20 ° C of 0.5 to 10 kPa.

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