JP7347976B2 - Gripper bar inspection device for flat plate punching machine - Google Patents

Description

The present invention relates to a gripper bar inspection device for a flat plate punching machine.

2. Description of the Related Art A flat plate punching machine is known that presses a sheet such as a corrugated board sheet with a cutting die to obtain a product having a predetermined shape (for example, Patent Document 1).

The flat plate punching machine of Patent Document 1 includes a paper feed section, a press section, a stripping section, and a hammer section in order from the upstream side to the downstream side along the sheet conveyance direction. The sheet sent out from the paper feed section is pressed by a cutting die in the press section, and is cut into a gripper margin section at the front edge of the sheet, and a product section and a non-product section located behind the gripper margin section. Then, the non-product part is removed from the sheet in the stripping part located downstream of the press part, and then the product part is separated from the gripper margin part in the hammer part located downstream of the stripping part. taken out.

Further, the flat plate punching machine of Patent Document 1 has a plurality of spikes stuck in the gripper margin portion as a device for sequentially conveying the sheet sent out from the paper feed section to the above-mentioned press section, stripping section, and hammer section. It has an intermittent conveyance device that circulates and moves a gripper bar to which a pin is fixed by sequentially stopping it at a press section, a stripping section, and a hammer section using a pair of gripper bar drive chains connected to both ends of the gripper bar. Further, this flat plate punching machine is provided with a margin removal section that removes the gripper margin portion from the gripper bar while the gripper bar is returning from the hammer section to the press section.

Japanese Patent Application Publication No. 2013-127412

When the inventor of the present application produced a large number of products using a flat plate punching machine having the above configuration, he encountered a problem in which broken parts of spike pins and fragments of gripper margin parts of sheets were mixed into the products.

That is, in order to enable high-speed and accurate intermittent conveyance of the sheet, the flat plate punching machine uses a spike pin inserted into the gripper margin portion at the front end of the sheet in the gripper bar that holds the sheet. This spike pin may break due to metal fatigue or the like, and in this case, there is a risk that the broken portion of the spike pin may get mixed into the product. Additionally, a margin removal section is provided on the way the gripper bar returns from the hammer section to the press section, and this margin removal section allows the gripper margin section to be smoothly removed from the spike pins when the gripper margin section is removed from the gripper bar. The gripper margin fragments may not be completely removed and remain on the gripper bar, and as a result, the gripper margin fragments may be mixed into the product. In this way, if broken spike pins or fragments from the gripper margin are mixed into a product, during inspections conducted before shipping the product (inspection using a metal detector, visual inspection by workers, etc.), It would be good if it could be discovered and removed, but there is a possibility that it cannot be discovered.

Therefore, the inventor of the present application has developed a system that immediately detects when a spike pin breaks due to metal fatigue, or when fragments from the gripper margin cannot be completely removed by the margin removal section and remain on the gripper bar. I considered whether it could be done.

As a result, the inventor discovered that if the condition of the gripper bar is inspected with a camera in the region where the gripper bar of the flat plate punching machine circulates and moves, and the gripper bar does not hold the gripper margin, the spike pins will be detected. The idea was that it would be possible to detect breakage due to metal fatigue, or when fragments of the gripper margin could not be removed by the margin removal section and remained on the gripper bar.

The problem to be solved by this invention is that when a spike pin breaks due to metal fatigue, or when fragments from the gripper margin cannot be completely removed by the margin removal section and remain on the gripper bar, the flat plate punching machine To provide a gripper bar inspection device for a flat plate punching machine capable of detecting any abnormality in the state of the gripper bar.

In order to solve the above problems, the present invention provides a gripper bar inspection device for a flat plate punching machine having the following configuration.
In other words, a paper feed unit that feeds out individual sheets;
By pressing the sheet sent out from the paper feed unit with a cutting die, the sheet is cut into a gripper margin portion at the front end of the sheet, and a product portion and a non-product portion located behind the gripper margin portion. Press section and
a stripping section that is disposed downstream of the press section and removes the non-product portion from the sheet;
a hammer part disposed downstream of the stripping part to separate and drop the product part from the gripper margin part;
A gripper bar having a plurality of spike pins fixed to the gripper margin portion is stopped in order at the press section, the stripping section, and the hammer section by a pair of gripper bar drive chains connected to both ends of the gripper bar. An intermittent conveyance device that circulates while
A gripper bar inspection device for a flat plate punching machine, which is attached to a flat plate punching machine, and includes a margin removing section that removes the gripper margin portion from the gripper bar while the gripper bar returns from the hammer section to the press section. And,
a gripper bar inspection camera that photographs the gripper bar at intermittent stop positions of the gripper bar on its way back from the margin removal section to the press section;
a gripper bar inspection control unit that performs an inspection based on an image of the gripper bar obtained by the gripper bar inspection camera;
A gripper bar inspection device for a flat plate punching machine is provided.

In this way, the gripper bar inspection camera photographs the gripper bar at the intermittent stop position after the gripper margin portion has been removed from the gripper bar, and based on the image of the gripper bar obtained by the gripper bar inspection camera photography. Since the inspection is performed at the same time, it is possible to inspect the condition of the gripper bar of the flat plate punching machine.

The gripper bar inspection control unit compares an image of the gripper bar obtained by the gripper bar inspection camera with a master image that is stored by photographing the gripper bar in advance with the gripper bar inspection camera before inspection. It can be configured to perform a spike breakage inspection to detect breakage of the spike pin.

In this way, when a spike pin breaks due to metal fatigue, etc., the broken part of the spike pin can be detected by comparing the image of the gripper bar obtained with the gripper bar inspection camera and the gripper bar using the gripper bar inspection camera before the inspection. This can be detected as a difference from the master image that has been photographed and stored. Therefore, when the spike pin breaks due to metal fatigue or the like, it can be reliably detected, and it is possible to prevent an accident in which the broken part of the spike pin gets mixed into the product.

The gripper bar inspection control unit compares an image of the gripper bar obtained by the gripper bar inspection camera with a master image that is stored by photographing the gripper bar in advance with the gripper bar inspection camera before inspection. A remaining margin inspection may be performed to detect fragments of the gripper margin portion that have not been completely removed by the margin removal unit.

By doing this, when the gripper margin part is not removed smoothly from the spike pin in the margin removal part and is torn, and the fragments of the gripper margin part remain on the gripper bar without being completely removed, the fragments of the gripper margin part can be removed. , it is possible to detect the difference between the image of the gripper bar obtained by the gripper bar inspection camera and the master image that is stored by photographing the gripper bar in advance with the gripper bar inspection camera before the inspection. Therefore, when fragments from the gripper margin cannot be completely removed by the margin removal unit and remain on the gripper bar, it can be detected reliably, and accidents such as fragments from the gripper margin getting mixed into the product can be prevented. It becomes possible to prevent this.

Here, a gripper bar identification mark is attached to each of the plurality of gripper bars, and the gripper bar inspection control unit is configured to scan the plurality of master images obtained by photographing the plurality of gripper bars in advance before the inspection. Preferably, the gripper bar identification mark is stored in correspondence with the gripper bar identification mark, and the plurality of gripper bars are inspected using separate master images corresponding to the gripper bar identification mark.

In this way, a plurality of gripper bars are inspected based on separate master images obtained by photographing each gripper bar, so that accurate and stable inspection becomes possible.

The gripper bar inspection control unit measures the amount of deviation of the intermittent stop position of the gripper bar from a reference position based on an image of the gripper bar obtained by the gripper bar inspection camera, and measures the amount of deviation of the gripper bar drive chain from the reference position. The chain can be configured to perform a chain elongation test to detect an abnormality in elongation of the chain.

In this way, when the gripper bar drive chain elongates over time, the intermittent stop position of the gripper bar changes according to the extent of elongation of the gripper bar drive chain, and the reference position of the intermittent stop position Since the amount of deviation from the gripper bar gradually increases, it becomes possible to detect abnormal elongation of the gripper bar drive chain based on the image of the gripper bar obtained by the gripper bar inspection camera.

The gripper bar includes a bar member whose both ends are connected to the pair of gripper bar drive chains, and a plurality of bar members are provided at intervals in the length direction of the bar member, and a plurality of bar members are provided at intervals in the length direction of the gripper bar drive chain. When adopting a spike pin fixing plate that protrudes rearward and the spike pin fixed to the spike pin fixing plate so as to rise vertically from the spike pin fixing plate,
further comprising a lighting device that irradiates light to the spike pin and the spike pin fixing plate of the gripper bar in the intermittent stop position;
Preferably, the illumination device is arranged on a side opposite to the side where the gripper bar inspection camera is located with respect to the spike pin so that specularly reflected light reflected by the spike pin fixing plate is incident on the gripper bar inspection camera.

In this way, when the gripper bar inspection camera photographs the spike pin and the spike pin fixing plate, the image of the spike pin portion will be the shadow side of the spike pin where the light emitted from the illumination device does not directly reach. The image of the spike pin fixing plate becomes brighter due to the specular reflection of the light emitted from the illumination device, and as a result, the spike pin part and the spike pin fixing plate can be distinguished with high contrast. possible images can be obtained. Therefore, accurate and stable inspection can be performed.

At this time, it is preferable that the surface of the spike pin fixing plate photographed by the gripper bar inspection camera be a shiny metal surface.

In this way, the specularly reflected light when the lighting device shines light on the spike pin fixing plate will be particularly bright, so when the spike pin and spike pin fixing plate are photographed with a gripper bar inspection camera, the spike pin It becomes possible to distinguish between the part and the part of the spike pin fixing plate with particularly high contrast, making it possible to perform extremely accurate and stable inspection.

In the gripper bar inspection device for a flat plate punching machine of the present invention, a gripper bar inspection camera photographs the gripper bar at an intermittent stop position after the gripper margin portion is removed from the gripper bar, and the gripper bar inspection camera photographs the gripper bar. Since the inspection is performed based on the obtained image of the gripper bar, it is possible to inspect the condition of the gripper bar of the flat plate punching machine. Therefore, the condition of the gripper bar of the flat plate punching machine may change when the spike pin breaks due to metal fatigue, or when fragments from the gripper margin cannot be removed by the margin removal section and remain on the gripper bar. It is possible to detect it when it is.

A diagram showing a flat plate punching machine incorporating an inspection device according to an embodiment of the present invention. A view from above of the sheet immediately after being pressed in the press section of the flat plate punching machine shown in Figure 1. Enlarged view of the vicinity of the inspection device of the flat plate punching machine shown in Figure 1 Right side view of the inspection device shown in Figure 3 A plan view of the inspection device shown in Figure 3 Enlarged view of the vicinity of the gripper bar inspection camera of the inspection device shown in Figure 3 A plan view of the vicinity of the gripper bar inspection camera of the inspection device shown in FIG. Enlarged view of the vicinity of the lighting device of the inspection device shown in Figure 3 Diagram showing the relationship between the field of view of the gripper bar inspection camera and the gripper bar shown in Figure 4 A diagram showing the spike pin and spike pin fixing plate part of the gripper bar image taken with the gripper bar inspection camera in Figure 1. A diagram showing the spike pin and spike pin fixing plate part of the gripper bar image taken with the gripper bar inspection camera in Figure 1 when the spike pin breaks. A cross-sectional view of the spike pin and spike pin fixing plate cut along the position corresponding to line XII-XII in Figure 10. A cross-sectional view of the spike pin and spike pin fixing plate cut along the position corresponding to line XIII-XIII in Figure 11 The figure on the left is a diagram showing the spike pin and spike pin fixing plate part of the gripper bar image taken by the gripper bar inspection camera of FIG. 1 when the gripper bar drive chain has progressed to elongate. The figure on the right shows the spike pin and spike pin fixing plate part of the gripper bar image taken by the gripper bar inspection camera in Figure 1 before the gripper bar drive chain begins to elongate. A diagram corresponding to FIG. 8 showing a state in which debris from the gripper margin remains on the gripper bar without being removed.

FIG. 1 shows a flat plate punching machine 1 incorporating an inspection device 2 according to an embodiment of the present invention. This flat plate punching machine 1 is a machine that presses a corrugated cardboard sheet 3 (hereinafter referred to as "sheet 3") with a cutting die 4 to produce a box blank having a predetermined contour shape as a product. The flat plate punching machine 1 includes a paper feed section 5, a press section 6, a stripping section 7, and a hammer section 8 in this order from the upstream side to the downstream side along the conveyance direction of the sheet 3.

The paper feed unit 5 includes a front guide 9 and a back guide 10 that respectively guide the front and rear ends of a plurality of sheets 3 in a stacked state, and guide the sheets 3 downstream one by one from the bottom of the stacked sheets 3. It has a sheet feeding device 11 that feeds the sheet to the side.

The press section 6 includes an upper platen 12 and a lower platen 13 that face each other vertically with the conveyance path of the sheet 3 interposed therebetween. A cutting die 4 having a cutting blade for cutting the sheet 3 is detachably attached to the lower surface of the upper platen 12. Upper platen 12 is a fixed support. The lower platen 13 is supported by an elevating drive mechanism 14 so as to be movable up and down. The sheet 3 sent out from the paper feed section 5 is pressed by the cutting die 4 in the press section 6, and as shown in FIG. It is divided into a product portion 3b and a non-product portion 3c.

As shown in FIG. 1, the stripping section 7 disposed downstream of the press section 6 has an upper stripping die 15 and a lower stripping die 16 that face each other vertically with the conveyance path of the sheet 3 in between. have The upper stripping mold 15 and the lower stripping mold 16 are supported so as to be movable up and down, respectively, at a position where the sheet 3 is sandwiched between them and at a position where both are separated from the sheet 3. The sheet 3 sent from the press section 6 to the stripping section 7 is sandwiched between an upper stripping die 15 and a lower stripping die 16, thereby removing the non-product portion 3c shown in FIG. That is, as shown in FIG. 2, among the gripper margin portion 3a, product portion 3b, and non-product portion 3c that constitute the sheet 3, the gripper margin portion 3a and the product portion 3b are left, and the non-product portion 3c is separated. removed. The non-product portion 3c is discharged to the outside by a scrap conveyor 17 disposed below the stripping lower die 16.

As shown in FIG. 1, a hammer part 8 located downstream of the stripping part 7 separates and takes out the product part 3b from the gripper margin part 3a. The product parts 3b separated from the gripper margin part 3a are sequentially stacked on the lifting conveyor 18, and then transported to the outside by the product discharge conveyor 19.

This flat plate punching machine 1 serves as a device for sequentially conveying a sheet 3 sent out from a paper feed section 5 to a press section 6, a stripping section 7, and a hammer section 8. A pair of gripper bar drive chains 21 (see FIG. 2) connected to both ends of the gripper bar 20 are used to sequentially stop the gripper bar 20 holding the gripper bar 20 at the press section 6, stripping section 7, and hammer section 8. It has an intermittent conveyance device 22 that circulates while moving.

The intermittent conveyance device 22 includes a pair of upstream chain wheels 23 (only one of which is shown in the figure) disposed opposite to each other on both sides of the conveyance path of the sheet 3 on the upstream side of the press section 6, and a pair of upstream chain wheels 23 (only one is shown in the figure) disposed upstream of the press section 6 on both sides of the conveyance path of the sheet 3; A pair of downstream chain wheels 24 (only one is shown in the figure) are arranged opposite to each other on both sides of the conveyance path of the sheet 3, a pair of upstream chain wheels 23, and a pair of downstream chain wheels 24. A pair of gripper bar drive chains 21 wrapped around between, a gripper bar 20 whose both ends are connected to the pair of gripper bar drive chains 21 so as to bridge between the pair of gripper bar drive chains 21, and an upstream chain. It has a rotational drive mechanism (not shown) that rotationally drives the wheel 23.

A plurality of gripper bars 20 (eight in the figure) are provided at regular intervals in the length direction of the gripper bar drive chain 21. The installation interval of the gripper bars 20 is determined by the intermittent conveyance distance of the sheet 3 in the flat plate punching machine 1 (i.e., the conveyance distance of the sheet 3 from the press section 6 to the stripping section 7, or from the stripping section 7 to the hammer section 8). (transfer distance of sheet 3).

As shown in FIG. 2, the gripper bar 20 includes a bar member 25 connected at both ends to a pair of gripper bar drive chains 21, and a plurality of spike pin fixing plates provided at intervals in the length direction of the bar member 25. 26, and a spike pin 27 fixed to the spike pin fixing plate 26 so as to stand vertically from the spike pin fixing plate 26. The spike pin 27 is a sharp pin that holds the sheet 3 on the gripper bar 20 by sticking into the gripper margin portion 3a. The spike pin 27 and the spike pin fixing plate 26 are made of metal (stainless steel). Each spike pin fixing plate 26 is fixed to the bar member 25 so as to protrude rearward from the bar member 25 in the conveyance direction of the gripper bar drive chain 21 . As shown in FIG. 1, by intermittently driving the gripper bar drive chain 21, each gripper bar 20 is cyclically moved to a press section 6, a stripping section 7, and a hammer section 8 while stopping in this order.

As shown in FIG. 1, this flat plate punching machine 1 is provided with a margin removal section 28 that removes the gripper margin portion 3a from the gripper bar 20 while the gripper bar 20 returns from the hammer section 8 to the press section 6. ing. The margin removing section 28 is arranged closer to the downstream chain wheel 24 than the upper position of the stripping section 7 . The margin removal section 28 has a margin discharge conveyor 29 that discharges the gripper margin portion 3a removed from the gripper bar 20 to the outside.

The flat plate punching machine 1 also includes a gripper bar inspection device 2 for inspecting the condition of the gripper bar 20, which is an intermittent stop position P of the gripper bar 20 when the gripper bar 20 is returning from the margin removal section 28 to the press section 6. The gripper bar inspection camera 30 photographs the gripper bar 20 at the intermittent stop position immediately before entering the upstream chainwheel 23 in the figure, and the spike pin 27 and spike pin fixing plate 26 of the gripper bar 20 at the intermittent stop position P. An illumination device 31 that irradiates light and a gripper bar inspection control section 32 that inspects the gripper bar 20 based on an image of the gripper bar 20 obtained by the gripper bar inspection camera 30 are attached.

As shown in FIGS. 3 to 5, the gripper bar inspection camera 30 is fixed to a camera support stand 34 that is provided so as to protrude upward from the frame 33 of the flat plate punching machine 1. As shown in FIGS. The gripper bar inspection camera 30 is an area camera that simultaneously reads images of a rectangular area having widths in the length direction of the gripper bar 20 and in the orthogonal direction thereof (transfer direction of the gripper bar 20). Two gripper bar inspection cameras 30 are arranged at intervals in a direction parallel to the length direction of the gripper bar 20. The distance from the gripper bar inspection camera 30 to the gripper bar 20 is set so that the viewing angle of the camera is less than 60 degrees (for example, 800 mm or more when the viewing width per camera is about 800 mm). has been done. This makes it possible to stably photograph the spike pin 27 located at the end of the field of view. Moreover, by employing a monochrome camera as the gripper bar inspection camera 30, images with high contrast can be obtained, and inspection with higher accuracy becomes possible.

As shown in FIGS. 6 and 7, the gripper bar inspection camera 30 includes an angle adjustment bracket 35 that can adjust the shooting angle with respect to the gripper bar 20, and a height adjustment bracket 36 that can adjust the height from the gripper bar 20. It is supported by

As shown in FIG. 3, the illumination device 31 is located closer to the gripper bar 20 than the gripper bar inspection camera 30. The lighting device 31 is an LED lighting device that includes a large number of LED light emitting elements 39 built in along the length direction of the gripper bar 20 .

Here, the illumination device 31 is placed on the side opposite to the side where the gripper bar inspection camera 30 is located with respect to the spike pin 27 so that specularly reflected light 37 reflected by the spike pin fixing plate 26 is incident on the gripper bar inspection camera 30. It is located. Here, the illumination device 31 is arranged on the front side in the transport direction of the gripper bar 20 with respect to the spike pins 27, and the gripper bar inspection camera 30 is arranged on the rear side in the transport direction of the gripper bar 20 with respect to the spike pins 27. There is.

As shown in FIG. 8, the illumination device 31 and the gripper bar inspection camera 30 are connected to the gripper bar inspection camera by the incident angle θ1 of light from the illumination device 31 to the spike pin fixing plate 26, and the regular reflection from the spike pin fixing plate 26. They are arranged so that the reflection angle θ2 of specularly reflected light 37 entering 30 is the same. That is, when the light incident on the spike pin fixing plate 26 from the illumination device 31 is reflected on the surface of the spike pin fixing plate 26, specular reflected light is reflected from the spike pin fixing plate 26 at a reflection angle θ2 equal to the incident angle θ1 of the light. 37, and diffusely reflected light that is reflected in all directions except the direction of the specularly reflected light 37 is generated. The gripper bar inspection camera 30 specularly reflects the light 37 reflected from the spike pin fixing plate 26 at a reflection angle θ2 equal to the incident angle θ1 of the light from the illumination device 31 to the spike pin fixing plate 26. It is arranged on an extension line of the light 37. The surface of the spike pin fixing plate 26 photographed by the gripper bar inspection camera 30 (the upper surface in the figure) is not painted and is a shiny metal surface.

As shown in FIG. 9, each gripper bar 20 is provided with a gripper bar identification mark 38 in the area photographed by the gripper bar inspection camera 30 (here, the upper surface of the bar member 25 in FIG. 8). The gripper bar identification mark 38 determines whether the gripper bar 20 to which the gripper bar identification mark 38 is attached is one of the plurality of gripper bars 20 based on the image of the gripper bar identification mark 38 taken by the gripper bar inspection camera 30. Each gripper bar 20 has a different mark so that it can be identified which gripper bar 20 it is.

In the flat plate punching machine 1 described above, a paper feed section 5 feeds out sheets 3 one by one, each sheet 3 is held by a gripper bar 20, and is stopped in order by a press section 6, a stripping section 7, and a hammer section 8. The product is manufactured by intermittent conveyance. At this time, the spike pin 27 of the gripper bar 20 immediately after passing through the hammer part 8 is in a state where the gripper margin part 3a is stuck, but after that, when the gripper bar 20 passes through the margin removal part 28, The gripper margin portion 3a is removed from the spike pin 27 of the gripper bar 20. Therefore, the gripper bar 20 on its way back from the margin removal section 28 to the press section 6 is in a state where it does not hold the gripper margin portion 3a. Thereafter, at the position of the upstream chain wheel 23 disposed between the paper feed section 5 and the press section 6, the spike pin 27 of the gripper bar 20 is inserted into the gripper margin portion of the front end of the sheet 3 fed out from the paper feed section 5. The sheet 3 is held by the sheet 3a, and is again intermittently conveyed while being stopped in the press section 6, stripping section 7, and hammer section 8 in this order.

Incidentally, the spike pin 27 may break due to metal fatigue or the like, and in this case, there is a risk that the broken portion of the spike pin 27 may get mixed into the product. Further, when the gripper margin portion 3a is removed from the gripper bar 20 by the margin removal unit 28, the gripper margin portion 3a is not pulled out smoothly from the spike pin 27 and is torn, and fragments of the gripper margin portion 3a are removed from the gripper bar 20. As a result, there is a risk that fragments of the gripper margin portion 3a may be mixed into the product. In this way, if the broken part of the spike pin 27 or the fragments of the gripper margin part 3a get mixed into the product, an inspection (inspection with a metal detector, visual inspection by an operator, etc.) is carried out before shipping the product. It would be good if it could be discovered and removed, but there is a possibility that it cannot be discovered.

Therefore, it is possible to immediately detect when the spike pin 27 breaks due to metal fatigue or when fragments of the gripper margin portion 3a remain on the gripper bar 20 without being completely removed by the margin removal section 28. The gripper bar inspection control unit 32 performs the inspection based on the image of the gripper bar 20 obtained by the gripper bar inspection camera 30. Control of this test will be explained below.

[Spike breakage inspection control]
First, a master image used for spike breakage inspection control is created and stored. That is, before inspection, each of the plurality of gripper bars 20 is photographed using the gripper bar inspection camera 30, and the image of the gripper bars 20 obtained at that time is stored as a master image. Here, to obtain the master image, without feeding the sheet 3 from the paper feed section 5, only the gripper bar 20 is moved to the press section 6, the stripping section 7, and the hammer section 8 while stopping in that order. At this time, it is possible to obtain a master image of each gripper bar 20 by sequentially photographing each gripper bar 20 that stops at the intermittent stop position P with the gripper bar inspection camera 30.

Here, in the master image, as shown in FIG. 10, the portion of the spike pin fixing plate 26 becomes bright, and the spike pin 27 appears dark with the spike pin fixing plate 26 in the background. That is, when the gripper bar inspection camera 30 photographs the spike pin 27 and the spike pin fixing plate 26, the gripper bar inspection camera 30 photographs the portion of the spike pin 27 on the side opposite to the side illuminated by the illumination device 31. As a result, the image of the spike pin 27 becomes dark because it is the shadow side of the spike pin 27 where the light emitted from the illumination device 31 does not directly reach, while the image of the spike pin fixing plate 26 becomes dark. The image becomes brighter due to the specularly reflected light 37 of the light emitted from the illumination device 31. As a result, the master image shows a portion of the spike pin 27 and a portion of the spike pin fixing plate 26 that can be distinguished with high contrast.

Next, the sheets 3 are sent out one by one from the paper feed section 5 to manufacture a product. At this time, the gripper bar 20 that stops at the intermittent stop position P is photographed by the gripper bar inspection camera 30, and the resulting image of the gripper bar 20 is compared with the master image to prevent breakage of the spike pins 27. Perform spike breakage inspection to detect. At this time, as shown in FIGS. 10 and 12, when the spike pin 27 is normal and not broken, the image of the gripper bar 20 is a dark image of the entire spike pin 27 with the spike pin fixing plate 26 in the background. However, as shown in FIGS. 11 and 13, when the spike pin 27 is broken due to metal fatigue or the like, the image of the gripper bar 20 becomes brighter than the part that should originally be dark due to the spike pin 27. . Therefore, during product manufacturing, breakage of the spike pin 27 is detected by calculating the difference between the data of the image of the gripper bar 20 obtained by photographing with the gripper bar inspection camera 30 and the data of the master image. It becomes possible to do so. When a breakage of the spike pin 27 is detected, the operator is notified of the abnormality using a buzzer, lamp, liquid crystal screen, etc. (not shown) electrically connected to the gripper bar inspection control section 32.

[Margin remaining inspection control]
First, similarly to the spike breakage inspection control, a master image used for the margin remaining inspection control is obtained. When the spike breakage inspection control and the margin remaining inspection control are performed in parallel, the master image used for the margin remaining inspection control can be the same as the master image for the spike breakage inspection control.

Next, the sheets 3 are sent out one by one from the paper feed section 5 to manufacture a product. At this time, the gripper bar 20 that stops sequentially at the intermittent stop position P is photographed by the gripper bar inspection camera 30, and the image of the gripper bar 20 obtained by the photographing is compared with the master image to be removed by the margin removal unit 28. A margin remaining inspection is performed to detect fragments of the gripper margin portion 3a that have not been completely removed. At this time, as shown in FIGS. 10 and 12, under normal conditions when the gripper margin portion 3a is completely removed from the spikes by the margin removing section 28, the image of the gripper bar 20 shows that the entire spike pin fixing plate 26 is The image will be bright, but as shown in FIG. 15, if the fragments of the gripper margin portion 3a are not completely removed by the margin removal unit 28 and remain on the gripper bar 20, a part of the spike pin fixing plate 26 will be removed. However, since it is covered with fragments of the gripper margin portion 3a, that portion appears dark in the image. Therefore, by performing processing to calculate the difference between the data of the image of the gripper bar 20 obtained by photographing with the gripper bar inspection camera 30 and the data of the master image during product manufacturing, the gripper remaining on the gripper bar 20 can be removed. It becomes possible to detect fragments in the margin portion 3a. When a fragment of the gripper margin portion 3a is detected, the operator is notified of the abnormality using a buzzer, LCD screen, etc.

In both of the spike breakage inspection control and margin remaining inspection control described above, the gripper bar inspection control unit 32 uses a plurality of master images obtained by photographing a plurality of gripper bars 20 in advance to identify gripper bars. A plurality of gripper bars 20 are stored and inspected using separate master images corresponding to the gripper bar identification marks 38 .

[Chain elongation inspection control]
First, a master image used for chain elongation inspection control is created and stored. The master image used for the chain elongation inspection control is different from the master image used for the above-mentioned spike breakage inspection control and margin remaining inspection control. That is, the master image for spike breakage inspection control and margin remaining inspection control is updated to a new master image when spike pin 27 breakage is detected, but the master image used for chain elongation inspection is updated to a new master image when spike pin 27 breakage is detected. Even when a breakage is detected, the master image is not updated, and the master image is the original image when the new gripper bar drive chain 21 is started to be used, or the master image obtained immediately after the tension adjustment of the gripper bar drive chain 21 is performed. Continue to use.

Next, the sheets 3 are sent out one by one from the paper feed section 5 to manufacture a product. At this time, the gripper bar 20 that stops at the intermittent stop position P is photographed by the gripper bar inspection camera 30, and as shown in FIG. The amount of deviation S of the stop position P from the reference position (the intermittent stop position P of the gripper bar 20 when the master image was obtained) is measured. In FIG. 14, the spike pin fixing plate 26 shown on the left side is an image of the gripper bar 20 taken by the gripper bar inspection camera 30 when the elongation of the gripper bar drive chain 21 progresses; The pin fixing plate 26 is an image of the gripper bar 20 taken by the gripper bar inspection camera 30 at the beginning of using the new gripper bar drive chain 21 (a master image taken of the gripper bar 20 in the reference position). The amount of deviation S of the intermittent stop position P of the gripper bar 20 from the reference position is determined, for example, by image processing between the position of the rear end of the spike pin fixing plate 26 in the master image and the spike pin fixing plate in the image taken during the inspection. It can be obtained by detecting the positions of the rear ends of 26 and calculating the difference. When the deviation amount S of the intermittent stop position P of the gripper bar 20 from the reference position reaches a preset allowable limit, it is determined that the elongation of the gripper bar drive chain 21 is abnormal, and a buzzer or LCD screen is displayed. Notify workers of abnormalities.

In this gripper bar inspection device 2, a gripper bar inspection camera 30 photographs the gripper bar 20 at an intermittent stop position P after the gripper margin portion 3a is removed from the gripper bar 20; Since the inspection is performed based on the obtained image of the gripper bar 20, it is possible to inspect the condition of the gripper bar 20 of the flat plate punching machine 1. Therefore, when the spike pin 27 breaks due to metal fatigue or the like, when fragments of the gripper margin portion 3a are not completely removed by the margin removal section 28 and remain on the gripper bar 20, or when the gripper bar drive chain 21 is stretched. It is possible to detect when there is an abnormality in the condition of the gripper bar 20 of the flat plate punching machine 1, such as when it becomes excessively large.

In addition, this gripper bar inspection device 2 attaches a gripper bar identification mark 38 to each of the plurality of gripper bars 20, and the gripper bar inspection control unit 32 is configured to attach a gripper bar identification mark 38 to each of the plurality of gripper bars 20. Since a plurality of master images are stored in correspondence with the gripper bar identification marks 38 and a plurality of gripper bars 20 are inspected using separate master images corresponding to the gripper bar identification marks 38, a plurality of Accurate and stable inspection is possible even when the shapes, dimensions, etc. of the gripper bars 20 differ slightly between the gripper bars 20.

Further, in this gripper bar inspection device 2, when the spike pin 27 and the spike pin fixing plate 26 are photographed with the gripper bar inspection camera 30, the image of the spike pin 27 portion is directly illuminated by the light emitted from the illumination device 31. The image of the spike pin fixing plate 26 becomes brighter due to the specular reflection light 37 of the light emitted from the illumination device 31, and as a result, the image of the spike pin fixing plate 26 becomes brighter due to the specular reflection light 37 of the light emitted from the illumination device 31. It is possible to obtain an image in which the part and the part of the spike pin fixing plate 26 can be distinguished with high contrast. Therefore, it is possible to perform accurate and stable inspection.

In addition, in this gripper bar inspection device 2, the surface of the spike pin fixing plate 26 that is photographed by the gripper bar inspection camera 30 is not painted and is a shiny metal surface. Specularly reflected light 37 when the spike pin fixing plate 26 is irradiated with light at 31 becomes particularly bright. Therefore, when the spike pin 27 and the spike pin fixing plate 26 are photographed with the gripper bar inspection camera 30, the spike pin 27 part and the spike pin fixing plate 26 part can be distinguished with a particularly high contrast, and are extremely accurate and stable. It is now possible to perform the following tests.

In the above embodiment, the gripper bar 20 is photographed by the gripper bar inspection camera 30 at the intermittent stop position P immediately before the gripper bar 20 enters the upstream chain wheel 23. If it is an intermittent stop position on the way back to the press section 6, the gripper bar 20 is photographed at an intermittent stop position further upstream than the intermittent stop position P immediately before the gripper bar 20 enters the upstream chain wheel 23. Good too.

Although the above embodiment has been described using a corrugated cardboard sheet as the sheet 3, the present invention can also be applied to a flat plate punching machine for the sheet 3 made of paperboard.

1 Flat plate punching machine 2 Gripper bar inspection device 3 Sheet 3a Gripper margin section 3b Product section 3c Non-product section 4 Cutting die 5 Paper feed section 6 Press section 7 Stripping section 8 Hammer section 20 Gripper bar 21 Gripper bar drive chain 22 Intermittent Conveyance device 25 Bar member 26 Spike pin fixing plate 27 Spike pin 28 Margin removal section 30 Gripper bar inspection camera 31 Illumination device 32 Gripper bar inspection control section 37 Specular reflection light 38 Gripper bar identification mark P Intermittent stop position S Amount of deviation

Claims (13)

a paper feed section (5) that feeds out a sheet (3);
By pressing the sheet (3) sent out from the paper feed section (5) with a cutting die (4), the sheet (3) is separated into a gripper margin portion (3a) at the front end of the sheet and the gripper margin portion. a press part (6) that cuts into a product part (3b) and a non-product part (3c) located on the rear side of (3a);
a stripping section (7) disposed downstream of the press section (6) and removing the non-product portion (3c) from the sheet (3);
a hammer part (8) arranged downstream of the stripping part (7) for separating and removing the product part (3b) from the gripper margin part (3a);
A pair of gripper bar drive chains (21) connected to both ends of the gripper bar (20) are used to connect a gripper bar (20) with a plurality of spike pins (27) fixed to the gripper margin portion (3a). an intermittent conveyance device (22) that circulates and moves while sequentially stopping at the press section (6), the stripping section (7), and the hammer section (8);
a margin removal unit (28) for removing the gripper margin portion (3a) from the gripper bar (20) on its way back from the hammer unit (8) to the press unit (6); A flat plate punching machine gripper bar inspection device that is attached to a flat plate punching machine (1) having:
A gripper bar photographing the gripper bar (20) at an intermittent stop position (P) of the gripper bar (20) on its way back from the margin removal section (28) to the press section (6). An inspection camera (30),
a gripper bar inspection control unit (32) that performs an inspection based on an image of the gripper bar (20) obtained by the gripper bar inspection camera (30);
has
The gripper bar inspection control unit (32) uses the gripper bar inspection camera (30) to check the image of the gripper bar (20) obtained by the gripper bar inspection camera (30) in advance. ) A gripper bar inspection device for a flat plate punching machine, which is configured to perform a spike breakage inspection to detect breakage of the spike pin (27) by photographing and comparing the captured image with a stored master image. A gripper bar identification mark (38) is attached to each of the plurality of gripper bars (20),
The gripper bar inspection control unit (32) stores a plurality of master images obtained by photographing a plurality of gripper bars (20) in advance in correspondence with the gripper bar identification mark (38) before inspection; Gripper bar inspection of a flat plate cutting machine according to claim 1 , wherein the plurality of gripper bars (20) are arranged to be inspected using separate master images corresponding to the gripper bar identification marks (38). Device. The gripper bars (20) include a bar member (25) connected at both ends to the pair of gripper bar drive chains (21), and a plurality of gripper bars (20) provided at intervals in the length direction of the bar member (25), a spike pin fixing plate (26) that protrudes rearward in the conveying direction of the gripper bar drive chain (21) from the bar member (25); and a spike pin fixing plate that stands up vertically from the spike pin fixing plate (26). (26) and the spike pin (27) fixed to the spike pin (27);
An illumination device (31) is provided that irradiates light to the spike pin (27) and the spike pin fixing plate (26) of the gripper bar (20) at the intermittent stop position (P),
The illumination device (31) is arranged to align the gripper with respect to the spike pin (27) so that specularly reflected light (37) reflected by the spike pin fixing plate (26) is incident on the gripper bar inspection camera (30). The gripper bar inspection device for a flat plate punching machine according to claim 1 or 2, wherein the device is arranged on a side opposite to the side where the bar inspection camera (30) is located. The gripper bar inspection device for a flat plate punching machine according to claim 3 , wherein the surface of the spike pin fixing plate (26) photographed by the gripper bar inspection camera (30) is a shiny metal surface. a paper feed section (5) that feeds out a sheet (3);
By pressing the sheet (3) sent out from the paper feed section (5) with a cutting die (4), the sheet (3) is separated into a gripper margin portion (3a) at the front end of the sheet and the gripper margin portion. a press part (6) that cuts into a product part (3b) and a non-product part (3c) located on the rear side of (3a);
a stripping section (7) disposed downstream of the press section (6) and removing the non-product portion (3c) from the sheet (3);
a hammer part (8) arranged downstream of the stripping part (7) for separating and removing the product part (3b) from the gripper margin part (3a);
A pair of gripper bar drive chains (21) connected to both ends of the gripper bar (20) are used to connect a gripper bar (20) with a plurality of spike pins (27) fixed to the gripper margin portion (3a). an intermittent conveyance device (22) that circulates and moves while sequentially stopping at the press section (6), the stripping section (7), and the hammer section (8);
a margin removal unit (28) for removing the gripper margin portion (3a) from the gripper bar (20) on its way back from the hammer unit (8) to the press unit (6); A flat plate punching machine gripper bar inspection device that is attached to a flat plate punching machine (1) having:
A gripper bar photographing the gripper bar (20) at an intermittent stop position (P) of the gripper bar (20) on its way back from the margin removal section (28) to the press section (6). An inspection camera (30),
a gripper bar inspection control unit (32) that performs an inspection based on an image of the gripper bar (20) obtained by the gripper bar inspection camera (30);
has
The gripper bar inspection control unit (32) uses the gripper bar inspection camera (30) to check the image of the gripper bar (20) obtained by the gripper bar inspection camera (30) in advance. ) is photographed and compared with a stored master image to perform a margin remaining inspection to detect fragments of the gripper margin portion (3a) that have not been completely removed by the margin removal unit (28). Gripper bar inspection device for flat plate punching machine. A gripper bar identification mark (38) is attached to each of the plurality of gripper bars (20),
The gripper bar inspection control unit (32) stores a plurality of master images obtained by photographing a plurality of gripper bars (20) in advance in correspondence with the gripper bar identification mark (38) before inspection; Gripper bar inspection of a flat plate cutting machine according to claim 5 , wherein the plurality of gripper bars (20) are arranged to be inspected using separate master images corresponding to the gripper bar identification marks (38). Device. The gripper bars (20) include a bar member (25) connected at both ends to the pair of gripper bar drive chains (21), and a plurality of gripper bars (20) provided at intervals in the length direction of the bar member (25), a spike pin fixing plate (26) that protrudes rearward in the conveying direction of the gripper bar drive chain (21) from the bar member (25); and a spike pin fixing plate that stands up vertically from the spike pin fixing plate (26). (26) and the spike pin (27) fixed to the spike pin (27);
An illumination device (31) is provided that irradiates light to the spike pin (27) and the spike pin fixing plate (26) of the gripper bar (20) at the intermittent stop position (P),
The illumination device (31) is arranged to align the gripper with respect to the spike pin (27) so that specularly reflected light (37) reflected by the spike pin fixing plate (26) is incident on the gripper bar inspection camera (30). The gripper bar inspection device for a flat plate punching machine according to claim 5 or 6, wherein the device is arranged on a side opposite to the side where the bar inspection camera (30) is located. The gripper bar inspection device for a flat plate punching machine according to claim 7 , wherein the surface of the spike pin fixing plate (26) photographed by the gripper bar inspection camera (30) is a shiny metal surface. a paper feed section (5) that feeds out a sheet (3);
By pressing the sheet (3) sent out from the paper feed section (5) with a cutting die (4), the sheet (3) is separated into a gripper margin portion (3a) at the front end of the sheet and the gripper margin portion. a press part (6) that cuts into a product part (3b) and a non-product part (3c) located on the rear side of (3a);
a stripping section (7) disposed downstream of the press section (6) and removing the non-product portion (3c) from the sheet (3);
a hammer part (8) arranged downstream of the stripping part (7) for separating and removing the product part (3b) from the gripper margin part (3a);
A pair of gripper bar drive chains (21) connected to both ends of the gripper bar (20) are used to connect a gripper bar (20) with a plurality of spike pins (27) fixed to the gripper margin portion (3a). an intermittent conveyance device (22) that circulates and moves while sequentially stopping at the press section (6), the stripping section (7), and the hammer section (8);
a margin removal unit (28) for removing the gripper margin portion (3a) from the gripper bar (20) on its way back from the hammer unit (8) to the press unit (6); A flat plate punching machine gripper bar inspection device that is attached to a flat plate punching machine (1) having:
A gripper bar photographing the gripper bar (20) at an intermittent stop position (P) of the gripper bar (20) on its way back from the margin removal section (28) to the press section (6). An inspection camera (30),
a gripper bar inspection control unit (32) that performs an inspection based on an image of the gripper bar (20) obtained by the gripper bar inspection camera (30);
has
The gripper bar inspection control unit (32) determines the reference position of the intermittent stop position (P) of the gripper bar (20) based on the image of the gripper bar (20) obtained by the gripper bar inspection camera (30). A gripper bar inspection device for a flat plate punching machine is configured to perform a chain elongation inspection for detecting an abnormality in elongation of the gripper bar drive chain (21) by measuring the amount of deviation (S) from the gripper bar drive chain (21). The gripper bars (20) include a bar member (25) connected at both ends to the pair of gripper bar drive chains (21), and a plurality of gripper bars (20) provided at intervals in the length direction of the bar member (25), a spike pin fixing plate (26) that protrudes rearward in the conveying direction of the gripper bar drive chain (21) from the bar member (25); and a spike pin fixing plate that stands up vertically from the spike pin fixing plate (26). (26) and the spike pin (27) fixed to the spike pin (27);
An illumination device (31) is provided that irradiates light to the spike pin (27) and the spike pin fixing plate (26) of the gripper bar (20) at the intermittent stop position (P),
The illumination device (31) is arranged to align the gripper with respect to the spike pin (27) so that specularly reflected light (37) reflected by the spike pin fixing plate (26) is incident on the gripper bar inspection camera (30). The gripper bar inspection device for a flat plate punching machine according to claim 9 , wherein the device is arranged on a side opposite to the side where the bar inspection camera (30) is located. The gripper bar inspection device for a flat plate punching machine according to claim 10 , wherein the surface of the spike pin fixing plate (26) photographed by the gripper bar inspection camera (30) is a shiny metal surface. a paper feed section (5) that feeds out a sheet (3);
By pressing the sheet (3) sent out from the paper feed section (5) with a cutting die (4), the sheet (3) is separated into a gripper margin portion (3a) at the front end of the sheet and the gripper margin portion. a press part (6) that cuts into a product part (3b) and a non-product part (3c) located on the rear side of (3a);
a stripping section (7) disposed downstream of the press section (6) and removing the non-product portion (3c) from the sheet (3);
a hammer part (8) arranged downstream of the stripping part (7) for separating and removing the product part (3b) from the gripper margin part (3a);
A pair of gripper bar drive chains (21) connected to both ends of the gripper bar (20) are used to connect a gripper bar (20) with a plurality of spike pins (27) fixed to the gripper margin portion (3a). an intermittent conveyance device (22) that circulates and moves while sequentially stopping at the press section (6), the stripping section (7), and the hammer section (8);
a margin removal unit (28) for removing the gripper margin portion (3a) from the gripper bar (20) on its way back from the hammer unit (8) to the press unit (6); A flat plate punching machine gripper bar inspection device that is attached to a flat plate punching machine (1) having:
A gripper bar photographing the gripper bar (20) at an intermittent stop position (P) of the gripper bar (20) on its way back from the margin removal section (28) to the press section (6). An inspection camera (30),
a gripper bar inspection control unit (32) that performs an inspection based on an image of the gripper bar (20) obtained by the gripper bar inspection camera (30);
has
The gripper bars (20) include a bar member (25) connected at both ends to the pair of gripper bar drive chains (21), and a plurality of gripper bars (20) provided at intervals in the length direction of the bar member (25), a spike pin fixing plate (26) that protrudes rearward in the conveying direction of the gripper bar drive chain (21) from the bar member (25); and a spike pin fixing plate that stands up vertically from the spike pin fixing plate (26). (26) and the spike pin (27) fixed to the spike pin (27);
An illumination device (31) is provided that irradiates light to the spike pin (27) and the spike pin fixing plate (26) of the gripper bar (20) at the intermittent stop position (P),
The illumination device (31) is arranged to align the gripper with respect to the spike pin (27) so that specularly reflected light (37) reflected by the spike pin fixing plate (26) is incident on the gripper bar inspection camera (30). A gripper bar inspection device of a flat plate punching machine, which is located on the opposite side to the side where the bar inspection camera (30) is located. The gripper bar inspection device for a flat plate punching machine according to claim 12 , wherein the surface of the spike pin fixing plate (26) photographed by the gripper bar inspection camera (30) is a shiny metal surface.

Images