JP2002282939A - Device for indicating defect of sheet material and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for indicating a defect of a sheet material and a method therefor capable of improving production yield by surely indicating a defect detected on a running sheet material. SOLUTION: The device 11 for indicating a defect of a web comprises a defect detecting part 32 to detect a defect of a semifinished web 21 which is running and a printing part 34 to print a sign on the semifinished web 21 based on a detection signal from the defect detecting part 32. By this method, a sign to indicate a defect is printed on the web 21, kept without being omitted in succeeding processes, and is continuously indicated without fail. The device 11 also comprises a cutting part 20 in the downstream of the printing part 34 to cut the semifinished web 21 to make a semimanufactured sheet and a cover 44 to sort out the semimanufactured sheet. This enables sorting out a good semimanufactured product from a defective semimanufactured product with high accuracy and improves the production yield of finished products.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for detecting and marking a defect in a running plate.

[0002]

2. Description of the Related Art Conventionally, in a production line for a lithographic printing plate,
A label is attached to a defect occurring on the web, and the web to which the label is attached is excluded in a later process.

More specifically, a defect detecting device provided on the production line detects a defect in a web being manufactured (hereinafter, referred to as a semi-finished product web), and detects a defect in the width direction of the web on which the defect is formed. A label for defect indication is attached to the portion (edge portion), and the label is detected in a post-process such as cutting the web, and among the webs cut into sheets, the label to which the label has been attached is excluded. ing.

[0004] However, in such a label sticking method, sticking failure occurs. For this reason, the label that has failed to be applied adheres to the use area of the product (sheet-shaped web), thereby deteriorating the quality of the product, or if the affixed position is defective, it becomes impossible to detect the label in the subsequent process. Therefore, there is a problem that a web on which a defect is formed is not removed, and a defective product is manufactured, thereby lowering the product yield.

[0005] Further, depending on the type of product, there is a problem that the adhesive strength is reduced due to compatibility between the product surface and the adhesive glue of the label, and the label is peeled off.

Further, in recent years, the production speed in the production line has been increased, so that the processing speed of the label sticking apparatus cannot be followed, and there has been a problem that the rate of occurrence of label sticking defects has increased.

In the label sticking method, a label is stuck to an end (edge) in the width direction of the web. However, since the web width differs depending on the product, the label sticking part of the label sticking apparatus is replaced with the edge of the web. Must be positioned. Therefore, when the end in the width direction of the web is meandering, there is also a problem that the position of the label attaching portion needs to be made to follow the meandering.

As a method of recording a defective portion on the web surface, a punching method of punching a web, a magnetic recording method of magnetically recording a web (Japanese Patent Publication No. 63-10784, etc.) and the like can be considered.

However, in the perforation method, the wound is easily transferred to the surface of the web overlapping the perforated portion during winding,
There are disadvantages, such as a large-sized punching device, and the advantages are small. Further, the magnetic recording method cannot be applied to an aluminum web generally used for a lithographic printing plate.

[0010] The above-described problem occurs not only with a web but also with a general plate material.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described circumstances, and has been made in consideration of the above-mentioned facts. It is an object of the present invention to provide a defect marking method.

[0012]

According to the first aspect of the present invention, there is provided a defect detecting section for detecting a defective portion of a running plate, and a symbol is provided on the plate based on a detection signal from the defect detecting section. And a printing unit for printing.

The printing position is generally a position that is not so far from the position where the defect is formed.

The printing method of the printing unit includes an ink jet system, a laser system, a stamp system, and the like. The detection system of the symbol detecting unit includes a photoelectric tube system, a bar code system,
It is a device of an image sensor type or the like.

According to the first aspect of the present invention, a symbol indicating a defective portion is printed, so that the symbol does not fall off from the plate material in a subsequent step, and the symbol is surely displayed.

The printing section is provided with a printing tip for printing a symbol toward the back side of the web (for example, when the printing section is an apparatus for printing by an ink jet method, an ejection section for ejecting ink is provided at the printing tip. Part). Two of these print tips may be provided. As a result, the reliability of printing can be greatly improved.

Further, the position of the leading end of the print is set to the width of the web so that the print position is located at the center of the web by a fixed length from the end in the width direction of the web, or is always located at the center of the web. You may make it follow. This makes it easy to detect the printed symbols.

According to the second aspect of the present invention, a cutting section is provided downstream of the printing section and cuts the plate material into a product, and the cutting section is provided downstream of the cutting section to detect the symbol. A symbol detection unit, and a distribution unit that sorts, based on a detection signal from the symbol detection unit, the product on which the symbol is printed and the product on which the symbol is not printed. .

As a result, a usable good product and a defective product having a defect can be sorted with high accuracy, and the yield of the final product can be greatly improved. Note that the product here includes an intermediate product such as a so-called semi-finished product.

Two sensors may be provided in the defect detecting section and the symbol detecting section for detection. As a result, the reliability of defect detection and symbol detection can be significantly improved.

According to the third aspect of the present invention, the defect detecting section transmits a signal for transmitting a start of the defective area and an end of the defective area to a control section for controlling the printing section, The unit prints a start symbol indicating the start of the defective area and an end symbol indicating the end of the defective area.

The start symbol and the end symbol are determined in advance.

According to the third aspect of the present invention, not only a spot-shaped defect portion can be marked, but also a defect portion having a spread can be marked as a defect range. It is possible to surely exclude the product on which the is formed.

According to a fourth aspect of the present invention, the printing section changes the type of the symbol in accordance with the type of the defective portion.

Thus, the defect information can be determined according to the type of the symbol. Therefore, by analyzing what kind of defect is large, it can be used for quality improvement and yield improvement. Also, when a certain important defect is detected, an alarm can be issued to notify the operator.

In the invention described in claim 5, the printing section changes the type of the symbol in accordance with the degree of damage to the defective portion, and the distribution means allocates the product for each type of the symbol. It is characterized by dividing.

As a result, the product can be classified into ranks according to the quality, such as a normal rank and a second rank.

According to a sixth aspect of the present invention, the printing section prints a serial number together with the symbol.

By counting the number of products rejected as defectives and confirming that this number matches the number at the end of the serial number, it is possible to judge that defectives have been reliably eliminated. it can.

According to a seventh aspect of the present invention, the printing section prints at a fixed position on a running line of the plate material.

Since the printing is performed at a fixed position on the running line of the plate material, the symbol is printed, for example, at the center of the web in the width direction or at a position slightly apart from the center in the width direction.

According to the seventh aspect of the present invention, even if the web width fluctuates, it is not necessary to make the position of the leading edge of the printing unit or the position of the detection sensor of the symbol detection unit follow the web width. Devices and the like are not required, and the device configuration is simplified.

[0033] The invention according to claim 8 is characterized in that the plate is a web for producing a lithographic printing plate.

Thus, the yield of the manufactured lithographic printing plate can be significantly improved.

According to the ninth aspect of the present invention, there is provided a defect detecting step for detecting a defective portion of a running plate material, and a printing step of printing a symbol on the plate material when the defective portion is detected in the defect detecting step. And the following.

As a result, the symbol indicating the defective portion is printed, so that the symbol does not fall off from the plate material in the subsequent steps, and the symbol is surely displayed.

In the invention according to the tenth aspect, after the printing step, a cutting step of cutting the plate material into a product, a symbol detecting step of detecting the symbol printed in the printing step, A sorting step of sorting, based on the detection signal in the step, the product on which the symbol is printed and the product on which the symbol is not printed.

As a result, a good product usable as an intermediate product and a defective product having a defect can be separated with high accuracy, and the yield of the final product can be improved.

The printing section encodes and prints information other than defects, detects the encoded printing in a later process, determines and sorts the product rank, and selects and pastes a product label. It is possible to change the control in product manufacturing in a later step, such as changing the mounting method, the accumulation method, and the packaging method.

According to an eleventh aspect of the present invention, in the printing step, printing is performed at a fixed position on a traveling line of the plate material.

Thus, even if the web width varies, the printing position does not need to follow the web width, so that the printing step and the symbol detecting step can be easily performed.

[0042]

Embodiments of the present invention will be described below with reference to embodiments.

[First Embodiment] As shown in FIG. 1, a web defect marking apparatus 11 according to the first embodiment is an apparatus provided on a lithographic printing plate manufacturing processing line by an integrated manufacturing processing system. The aluminum web 10 unwound from the delivery coil is conveyed by the conveyance rollers 12 while being subjected to a surface treatment section 14 for treating the web surface, and a photosensitive liquid for applying a photosensitive liquid to the web surface treated by the surface treatment section 14. Coating section 16, drying section 1 for drying the applied photosensitive liquid
8, a semi-finished product web 21 is sequentially formed, cut by a cutting unit 20 into a sheet-like member 22 as a semi-finished product, conveyed by a belt-type conveyance unit 24, and accumulated in a semi-product accumulation unit 26.

Between the drying section 18 and the cutting section 20, a defect detection section 32 for detecting a defect on the surface of the semi-finished web 21 is provided.
And a printing section 34 for printing a symbol of a defect sign on the back side of the semi-finished product web 21 are sequentially provided. In addition, printing control of the printing unit 34 and a driving unit 48 described later (see FIG. 4)
Is provided with a control unit 38 for controlling the driving of the motor.

When a defect is detected by the defect detection section 32, the defect detection section 32 transmits a detection signal to the control section 38 (defect detection step).

Detection sensor (not shown) of defect detection unit 32
Of the web from the position of the printing unit 34 to the printing front end 35 (see FIG. 2) of the printing unit 34 is observed by a roller and an encoder (neither is shown) for measuring the running distance,
8, when the control unit 38 receives the detection signal, the control unit 38 controls the printing unit 34 to print when the defect reaches the printing position.

Under such control, the printing section 34 prints the symbol x (see FIG. 3) of the defect sign at the center position in the width direction on the back side of the portion where the defect DA or defect DB is formed. (Printing step).

After passing through the printing section 34, the semi-finished web 2
1 is cut into a predetermined length by the cutting section 20 (cutting step), and is made into a sheet-like member as a semi-finished product.

On the downstream side of the printing unit 34, a symbol detecting unit 40 for detecting printed symbols is provided. As shown in FIG.
An openable / closable lid 44 constituting a transport path and a drive unit 48 having an arm 46 for opening / closing the lid 44 are provided.

When detecting the symbol x printed by the printing unit 34 (symbol detection step), the symbol detection unit 40 transmits a detection signal to the control unit 38. When receiving the detection signal, the control unit 38 transmits to the driving unit 48 a signal instructing that the arm 46 is pulled after a lapse of the set time.

As a result, when the sheet member 22 on which the symbol X is printed passes over the cover 44, the cover 44 is opened, and the sheet member 22 is accumulated in the defective product accumulation section 50 (distribution step). .

Thus, the sheet-like member 2 having a defect
2 and a good sheet-like member 22 on which no defect is formed
Can be sorted and accumulated.

In the first embodiment, as shown in FIG.
Although the tip of the lid 44 is located on the side of the transport destination (downstream side in the transport direction U), as shown in FIG. 5, the distal end of the lid 44 is located on the side of the transport source (upstream side in the transport direction U). The same effect can be obtained by doing so.

[Modification of First Embodiment] In this modification, the first embodiment
The printing position of the printing unit 34 is fixed as compared with the mode.
The printing position is a position separated by a predetermined distance from the center position of the conveyance path (for example, a position separated by 50 mm to the right as viewed from the upstream side to the downstream side in the web conveyance direction).

Thus, even when the width of the semi-finished product web 21 fluctuates and the center position of the web is moved, the detection sensor (not shown) of the printing tip 35 (see FIG. 2) of the printing unit 34 or the symbol detection unit 40 is used. ) Does not need to be followed, and the device configuration can be simplified.

As shown in FIGS. 6 and 7, when the semi-finished web 21 is slit into two in the processing step, the printing position is viewed from the upstream side to the downstream side of the semi-finished web 21 to the right from the center of the web. For each of the half and the left half, as shown in FIG.
4. By providing the symbol detection unit 40, the lid 44, and the drive unit 48, it is possible to independently mark a defect, detect a defect, and eliminate a sheet-shaped member in the right half and the left half. In this case, a defect is marked only on one side where a defect exists on the semi-finished web, and the semi-finished web 21 is cut into right and left halves from the center of the web and cut into sheet-like members, and then the defect is marked. 9 (for example, as shown in FIG. 9, the sheet-like member 22A with the defect A01 and the sheet-like member 2 with the defect B20)
2B) is eliminated as a defective product in the downstream process,
It is possible to improve the product yield.

Similarly, when the semi-finished product web 21 is cut in the downstream process as three or more slits in the longitudinal direction, the presence of a defect in a specific slit is determined by a predetermined symbol (slit number or the like). In the labeling and downstream processes, it is possible to easily detect a defect only in the specific slit where the above-mentioned defect exists and exclude it as a defective product, and to use other parts where there is no defect as a product. .

[Second Embodiment] Next, a web defect marking device according to a second embodiment will be described. As shown in FIG. 8, the web defect marking device 60 according to the second embodiment is a device provided on a lithographic printing plate manufacturing / processing line using a manufacturing / separation method. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Web 1 unwound from delivery coil
0 is the same as that of the first embodiment up to the point where the coating liquid is applied and dried to form the semi-finished web 21, and when a defect is detected by the defect detection unit 32, the symbol is printed by the printing unit 34.

In the second mode, the coil is once wound into a coil. And the semi-finished web wound in a coil shape,
The web is transported to a processing line L provided with a cutting section 20 for cutting the web into a sheet, and is set at an unwinding position.

After setting, the semi-finished product web 21 is unwound,
The same processing as in the first embodiment is performed. That is, the symbol detection unit 4
If a symbol is detected at 0, the cutting section 20 cuts the symbol and then the cover 44
Is opened, and the sheet-like member 22 having a defect is accumulated in the defective product accumulation unit 50 as a defective product.

According to the second embodiment, the same effect as in the integrated processing manufacturing method can be obtained even in the manufacturing processing separation method.

The control section 38 may be separated from each other in the production line section and the processing line section.

[Third Embodiment] Next, a third embodiment will be described. As shown in FIG. 9, the web defect marking device 70 according to the third embodiment includes a lid that switches the discharge destination of the sheet-like member (semi-finished product) cut by the cutting unit 20. The discharge destination of the sheet-like member is switched according to the type of defect. Third
In the embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As in the first embodiment, the lids 62A and 62B provided on the transport line for transporting the sheet member 22 are opened and closed by arms (not shown) provided in a drive unit (not shown). You.

When detecting a defect, the defect detecting section 32 transmits a detection signal and a type of the defect to the control section 38 as a detection signal. In the third embodiment, the defect detection unit 32 determines a plurality of types of defects. Hereinafter, a description will be given of an example in which there are two types (here, these two types of symbols are referred to as a type A symbol and a type B symbol, respectively).

The web defect marking device 70 is provided with a printing unit 74 capable of printing two types of symbols, and the control unit 38 prints a symbol corresponding to the type of defect on the back side of the web. To print. The correspondence between the type of defect and the character to be printed is determined in advance.

For example, as shown in FIG. 10, the printing unit 34 prints symbols A01 and B20 according to the types of defects DA and DB on the front side of the web 10 and the degree of damage, respectively.

Thereafter, the web is cut to a predetermined length by a cutting section 20 to form a sheet-like member 22.

When detecting the symbol, the symbol detecting section 40 transmits the detection and the type of the symbol to the control section 38.

When the control unit 38 receives the type A symbol,
When the sheet-like member passes through the lid 62A, that is, after a set time has elapsed from the reception, the driving unit is controlled so as to open the lid 62A. When the B-type symbol is received, when the sheet-shaped member passes through the lid 62B, that is, after a set time (this set time is slightly longer than the case of the A-type symbol) elapses after the reception, the lid 62B is closed. Control the drive to open.

Thus, the sheet-like member 2 having a defect
2 is a defective product accumulation unit 50A for each type of printed symbol,
50B. Also, a good sheet-like member 22
Are integrated in the semi-finished product integration unit 26.

It is to be noted that the cover 62 is set according to the type of the symbol to be set.
It is obvious that the sheet-like member 22 can be further subdivided and distributed by increasing the number of.

[0074]

According to the present invention having the above-described configuration, the following effects can be obtained.

According to the first aspect of the present invention, a mark indicating a defective portion is printed, so that the mark does not fall off from the plate material in a subsequent step, and the mark is surely kept.

According to the second aspect of the present invention, a good product usable as an intermediate product and a defective product having a defect can be sorted with high accuracy, and the yield of the final product can be greatly reduced. Can be improved.

According to the third aspect of the present invention, not only a spot-shaped defect portion can be marked, but also a defect portion having a spread can be marked as a defect range. It is possible to reliably exclude products having defective defects.

According to the present invention, the defect information can be determined based on the type of the symbol. Therefore, by analyzing what kind of defect is large, it can be used for quality improvement and yield improvement. Also, when a certain important defect is detected, an alarm can be issued to notify the operator.

According to the fifth aspect of the present invention, products can be classified into ranks according to quality, such as a normal rank and a second rank.

According to the sixth aspect of the present invention, the number of products excluded as defectives is counted, and it is confirmed that this number matches the number at the end of the serial number, so that the defectives can be reliably determined. Can be determined to have been excluded.

According to the seventh aspect of the present invention, even if the web width fluctuates, it is not necessary to make the position of the leading edge of the printing unit or the position of the detection sensor of the symbol detecting unit follow the web width. Become simple.

According to the eighth aspect of the invention, the yield of the manufactured lithographic printing plate can be greatly improved.

According to the ninth aspect of the present invention, the symbol indicating the defective portion is printed, so that the symbol does not fall off the plate material in the subsequent steps, and the symbol is surely displayed.

According to the tenth aspect, a good product usable as an intermediate product and a defective product having a defect can be classified with high accuracy, and the yield of the final product is improved. be able to.

According to the eleventh aspect of the present invention, even if the web width changes, the printing position does not need to follow the web width, so that the printing step and the symbol detecting step can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side view showing a web production line provided with a web defect marking device according to a first embodiment.

FIG. 2 is a side view illustrating a configuration of a printing unit according to a first embodiment.

FIG. 3 is a rear view showing the web back side in the first embodiment.

FIG. 4 is a perspective view showing a lid which can be freely opened and closed and a mechanism for opening and closing the lid provided in a transport path in the first embodiment.

FIG. 5 is a side view showing another example of the first embodiment.

FIG. 6 is a perspective view showing a web production line in a modification of the first embodiment.

FIG. 7 is a plan view showing that a web is cut into a sheet-like member in a modification of the first embodiment.

FIG. 8 is a side view showing a web production line provided with a web defect marking device according to a second embodiment.

FIG. 9 is a side view showing a web production line provided with a web defect marking device according to a third embodiment.

FIG. 10 is a rear view showing a web back side in a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Defect marking device of web (defect marking device of plate material) 20 Cutting part (cutting part) 21 Semi-finished web (plate material) 22 Sheet-shaped member (product) 32 Defect detection part 34 Printing part 38 Control part 40 Symbol detection part 44 Cover (Distribution means) 60 Web defect marking device (plate material defect marking device) 70 Web defect marking device (plate material defect marking device) 62A, B Lid (distribution means) 74 Printing unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H084 AA30 AE07 AE10 CC05 2H096 AA06 CA12 3F053 EA05 EC12 ED02 ED19 LA06 LB10

Claims (11)

[Claims] 1. A defect detecting unit for detecting a defective portion of a running plate material, and a printing unit for printing a symbol on the plate material based on a detection signal from the defect detecting unit. Defect marking device for plate materials. 2. A cutting unit provided downstream of the printing unit and cutting the plate material into a product, a symbol detection unit provided downstream of the cutting unit and detecting the symbol, and the symbol The method according to claim 1, further comprising: a sorting unit configured to sort the product on which the symbol is printed and the product on which the symbol is not printed based on a detection signal from a detection unit. Defect marking device for plate materials. 3. The defect detecting section transmits a signal for transmitting a start of a defective area and an end of the defective area to a control section for controlling the printing section, Start sign to indicate
3. An apparatus according to claim 1, wherein an end symbol indicating the end of the defective area is printed. 4. The printing device according to claim 1, wherein the printing unit changes the type of the symbol according to the type of the defective portion.
Or the defect marking device for a plate material according to 2. 5. The method according to claim 1, wherein the printing unit changes a type of the symbol according to a degree of damage of the defective portion, and the distribution unit allocates the product for each type of the symbol. Item 3. The defect marking device for a plate material according to Item 1 or 2. 6. The apparatus according to claim 1, wherein the printing unit prints a serial number together with the symbol. 7. The apparatus according to claim 1, wherein the printing unit performs printing at a fixed position on a traveling line of the plate material. 8. The apparatus according to claim 1, wherein the plate is a web for producing a lithographic printing plate. 9. A defect detecting step for detecting a defective portion of a running plate material, and a printing step of printing a symbol on the plate material when the defective portion is detected in the defect detecting step. Defect marking method for sheet material. 10. After the printing step, a cutting step of cutting the plate material into a product, a symbol detection step of detecting the symbol printed in the printing step, and a detection signal in the symbol detection step. 10. The method according to claim 9, further comprising: sorting the product on which the symbol is printed and the product on which the symbol is not printed. 11. The method according to claim 9, wherein, in the printing step, printing is performed at a fixed position on a traveling line of the plate material.