JP2008012778A - Method and apparatus for punching flat board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for punching a flat board, which decreases a working time by implementing inspection while punching a product, and by recovering only product sheets through a stacker part or a product carry-out part by separately collecting nondefectives/defectives. <P>SOLUTION: A carton blank (CB) production method includes: a carton sheet (CS) supply process in which carton sheets (CS) are taken out one by one from a printed carton sheet (CS) paper pile to be delivered to the next process; a punching process for rapping the CS along a printed outline with a joint alone left untreated; an inspection process in which the punched CS is judged whether it is a nondefactive or a defective; a residue removing process in which an unnecessary part is removed from the inspected punched CS to obtain the carton blank (CB); a defective removing process in which only a defective is removed selectively out of the CB to be deposited on a prescribed receiving stand; and a product collecting process for collecting a CB product. The photographic mechanism of the inspection process is moved to correspond to the vertical movement of the CB, the inspection process is carried out while the distance between it and the surface to be detected of the CB is kept approximately constant, and a removal operation in the defective removing process is actuated to synchronize with information obtained there. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flat plate punching method and apparatus capable of automatically detecting non-defective and defective products of a carton blank and recovering the good and defective products separately in the process of manufacturing a carton blank by punching a carton sheet. is there.

  An apparatus for producing a carton blank by punching a carton sheet such as a printed corrugated cardboard sheet is usually provided by a paper feeding unit for feeding a raw material sheet, a punching unit for punching a fed raw material sheet, and by punching. It is comprised from the waste removal part which removes the formed punching waste, and the collection | recovery part which accommodates the carton sheet | seat after removing waste.

  The raw material sheets are separated from the paper feed unit one by one and sent to the punching unit, where they are punched into a predetermined shape and then sent to the waste removal unit, where the product portion and the gripper margin are separated. The remaining non-product part is separated, and the product is dropped from the gripper margin in the collecting unit and deposited on the stacker for collection.

  The movement between the parts during this period is performed by gripping the gripper margin portion by gripping means arranged at appropriate positions on the conveyor, but the gripper margin which is finally separated from the product and remains gripped After being passed, the gripper margin collecting unit collects it.

By the way, when manufacturing a carton blank from a carton sheet printed on such a surface, it is necessary to perform a punching due to misalignment of the printed pattern and the cut part, printing stains, scratches on the carton blank, wear or damage to the punching blade, etc. Defective products due to mistakes will be produced, but these inspections must be performed by visual inspection of workers or inspection (off-line inspection) by a dedicated inspection device at a place different from the normal manufacturing process line. . In this inspection, the product carried out from the recovery unit is visually monitored or inspected by an inspection device. If the cutting state in the punching unit is defective, the machine is stopped and the cutting tool is inspected. If there is a misalignment between printing and removal, stop the machine and check the paper stacking position of the paper feed unit and make adjustments, or adjust the horizontal register. ing.
Also, if printing smudges occur, the machine is stopped once and inspected for contamination at the part through which the raw material sheet passes, and if it is found, it is cleaned.

  In any of these cases, after completion of the work, it is confirmed whether or not the defective part has been repaired through the work through one or several raw material sheets. Operation is resumed, but if the inconvenience has not been resolved, the adjustment of the cutting tool, the adjustment of the paper stacking position and the register position, and the cleaning work of the contamination source are repeated until the inconvenience is resolved. There must be.

  In order to save time and labor for repeatedly performing such adjustments, recently, a flat plate punching apparatus has been provided with inspection means for identifying non-defective products and defective products, and based on the information obtained thereby, Good products and defective products are automatically collected separately.

  Thus, as a flat plate punching device having a function of selecting non-defective products and defective products in this way, a quality inspection mechanism has been provided between the paper feeding unit and the punching unit so far. An automatic flat plate punching device (see Patent Document 1) for marking non-defective products and stacking non-defective products and defective products on separate paper stacks, and a punching section for punching a printed sheet material into a predetermined shape In the apparatus equipped with a scrap removing section for removing punching waste generated in the punching section and a collecting section for sequentially depositing the carton blank from which the scrap has been removed, the vertical movement of the carton blank sent out from the punching section is performed. A vertical movement limiting means for limiting, and an inspection means for imaging at least one surface of the carton blank whose vertical movement is suppressed by the vertical movement limiting means and inspecting the quality of the carton blank based on the captured image. A flat plate punching device provided with an inspection part (see Patent Document 2), a press part for pressing a predetermined die onto the material to be punched, and a product portion and a gripper margin from the pressed material to be punched. Stripping part that removes the product part, non-defective knock-off part that separates the product part from the gripper margin, a delivery part that accommodates the product part separated by the non-defective knock-off part, and a press part, a stripping part, and a delivery part to be punched In the flat plate punching device comprising a transport means for sequentially transporting to the part, a detection means for detecting the state of the punched material is provided on the upstream side of the delivery part, and based on the detection result of the detection means, Provided with a control unit that discriminates the defective punched material and controls the delivery unit to not operate the non-defective knock-off unit when it is determined that the punched material is defective. Such as platen punching device according to claim Rukoto (see Patent Document 3) are proposed.

JP 2004-299020 A (Claims and others) JP 2006-53080 A (Claims and others) Japanese Patent No. 2994638 (Claims and others)

In the conventional flat plate punching device, after the product gripped by the gripper is cut off from the gripper margin, the product part is once collected through the stacker part, that is, the product accumulation part and the product carry-out part, and visually checked by the operator. Discrimination between good and defective products due to inspections and time loss such as passing the product through a separate inspection device, additional space for installation required, and visual inspection. However, there is a drawback that defective products cannot be completely removed. Further, in a method including means for imaging at least one surface of the carton blank whose vertical movement is suppressed by the vertical movement restriction means, the gripper margin and the product part or the part that becomes waste are separated and scattered by physical contact. There are drawbacks.
The present invention overcomes the drawbacks of the conventional automatic flat plate punching device, performs inspection while punching the product, sorts and collects non-defective products and defective products, and collects only the product sheet as a stacker unit or product. The object of the present invention is to provide a flat plate punching method and apparatus that can be collected through the carry-out section and can reduce the working time.

  As a result of intensive research to improve the working efficiency of a flat plate punching apparatus that can automatically separate good products from defective products, the present inventors have developed a detection means for discriminating between good products and defective products as a carton blank. When imaging both the upper and lower surfaces or any one surface of the carton blank, it is configured to keep the distance from the carton blank substantially constant corresponding to the vertical movement of the carton blank. Accurately detect pass / fail or surface dirt and damage, remove defective products from good products based on the information, and stack only good products on the cradle to quickly detect defective products in a non-contact state, and The present inventors have found that a product can be collected without going through the stacker unit and the product carry-out unit, and have made the present invention based on this finding.

  That is, the present invention is a carton sheet supplying step for taking out one sheet from a printed carton sheet pile and sending it to the next process. The supplied carton sheet is punched along the printed outline, leaving only the connecting portion. Punching process, inspection process for determining whether the carton sheet is punched or defective, a scrap removing process for removing unnecessary parts from the carton sheet after punching to obtain a carton blank, In a carton blank manufacturing method including a defective product removing step of selectively removing only defective products from a carton blank sent from the taking step and depositing them on a predetermined cradle and a product recovery step of collecting the carton blank products The imaging mechanism in the above inspection process is moved corresponding to the vertical movement of the carton blank, A method and a carton characterized by performing an inspection process while maintaining the distance of the rank to the surface to be detected substantially constant, and operating a removal operation in the defective product removal process in synchronization with the information obtained there A feeding unit equipped with a mechanism that pulls out carton sheets one by one from the stack of sheets and feeds them to the next punching unit, and supports the carton sheet sent from the feeding unit with the upper part as a cutting blade and the lower part up and down The punching part equipped with a mechanism for punching into a predetermined shape configured as a plate, and the carton sheet after punching move up and down according to the vertical movement of the surface to be inspected, and keep the distance from the surface to be inspected almost constant Inspection unit with an imaging mechanism that can be removed, a scrap removing unit with a mechanism for removing unnecessary parts from a carton sheet after punching, and only defective products are taken out based on the information of the inspection unit, on a predetermined cradle Defective product removing section having a mechanism for depositing, a product recovery section having a mechanism for depositing a non-defective carton blank that has passed through the defective product removing section on a predetermined cradle, and a plurality of sheets for moving the sheet between the above parts It is an object of the present invention to provide an automatic flat plate punching device including a sheet conveying mechanism composed of an endless chain in which the gripper bars are fixed at equal intervals.

  According to the present invention, it is possible to take out a sheet that is an almost complete product in the subsequent process of the residue removing process, so that the waiting time until the product that has passed through the stacker unit is discharged by the transport conveyor or the transport conveyor It is possible to move without taking time and effort to move, and it is possible to reduce the labor of the operator and shorten the time until product removal.

Next, the best mode for carrying out the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view showing a typical example of an apparatus suitably used in the method of the present invention, and FIG. 2 is a plan view showing changes in each shape from the raw material sheet to the product sheet in each step of the method of the present invention. is there.

In FIG. 1, 21 is a paper feed unit, 22 is a punching unit, 23 is an inspection unit, 24 is a waste removal unit, 25 is a defective product removal unit, and 26 is a product collection unit.
The sheets S ₁ stacked on the sheet feeding unit 21 are separated one by one and supplied to the punching unit 22 by the sheet conveying mechanism 7. The sheet conveying mechanism 7 includes a gripper bar 7e provided at equal intervals, whereby the sheet S ₁ is gripped and transported to the punching section 22.

The sheet S ₁ conveyed to the punching unit 22 is temporarily stopped, and is cut into a product part and a non-product part, leaving a connecting part so as not to be separated when the sheet is conveyed in the punching unit 22 provided with a cutting tool. The sheet K ₁ thus conveyed is conveyed by the sheet conveying mechanism 7 to the next waste removing unit 24.
The punching unit 22 includes a movable plate 2b that includes an upper fixed plate 2a for mounting a blade 2 (not shown) for cutting a predetermined portion of the sheet and a vertical movement means 2c, and is movable up and down. .

Next, the sheet K ₁ conveyed to the waste removal unit passes through the inspection unit 23, and the inspection mechanism 4 discriminates printing defects such as printing stains and fading, and the position of printing and punching misalignment. To do.

Here, the inspection unit 23 and the inspection mechanism 4 will be described. FIG. 3 is a side view showing details of the inspection unit 23 including the inspection mechanism 4.
In this example, the inspection part 23 is installed between the punching part 22 and the scrap removing part 24.

The test mechanism 4 and instructs the photographing timing of the inspection imaging device for example a camera 4a and the camera to inspect the underside of the sheet K _1, the photographed image is determined controller whether good or defective by the image pickup apparatus 4a (FIG. And an interval adjusting means 4b for adjusting the interval between the camera and the sheet K ₁ that holds the imaging device 4a and passes above and above the imaging device 4a while swinging up and down. actuating the interval adjusting unit 4b for adjusting the vertical position of the displacement sensor 4c and displacement sensors in corresponding to the vertical swing size of sheet K ₁ detected imaging device 4a to monitor for measuring _one of the vertical swing in real time It is comprised by the control apparatus (not shown).
As the displacement sensor 4c, a non-contact sensor such as a known laser displacement sensor or ultrasonic sensor is preferably used.

The inspection unit 23 is punched by the punching unit. When the sheet K ₁ is conveyed to the waste removal unit 24 of the next process while the end thereof is held by the gripper bar 7e, the inspection unit 23 passes over the imaging device 4a. the timed between the generally until the end of the sheet K ₁ opposite the gripper bar 7e sheet K ₁ until preset position from the by end gripped gripper bar 7e of the sheet K ₁ passes, imaging Immediately detect various defects such as the quality of the surface to be inspected of the sheet K ₁ photographed by the apparatus 4a, such as dirt on the printing surface, misalignment of the printing position, scratches, misalignment of printing and punching position, etc. Judgment. Here, if it is determined as a defective product, it is removed and discharged by a defective product removing unit 25 described later.

The imaging device 4a is for sheet K ₁ to determine whether good or defective precisely correctly, it must be held as constant as possible the distance L between the surface to be inspected of the imaging device 4a and the sheet K ₁ There is.

A means is needed for a constant focal length L of the imaging device 4a and the object by the inspected surface of the sheet K ₁ is subject to swing up and down according to the movement of the gripper bars 7e. However, although one end of the carton blank K ₁ punched a distance L is constant and the imaging device for example a camera 4a for being grasped by the gripper bars 7e, one end is supported by something like a gripper bar 7e or gripping is Orazu, etc. are supported by a movable plate 2b of the punched portions 22 of the aforementioned, with the up and down movable plate 2b for the self-weight of the sheet K ₁ is the one which is not gripped carton box K ₁ The end swings up and down. Therefore, the distance L between the sheet K ₁ passing above the imaging device 4a and the imaging device 4a changes according to the position passing from the gripped side.

In the method of the present invention, as means for keeping the distance between the imaging device 4a and the sheet K ₁ constant, physical means is used to swing the sheet K ₁ up and down as in known means (Japanese Patent Laid-Open No. 2006-53080). The position of the image pickup device 4a is changed in response to the swinging.

In this case, the distance L between the surface to be inspected of the sheet K ₁ is not constant, the position of the sheet K ₁ held by the gripper bar 7e is changed to take the movement of the gripper bar 7e. This change is the same as the change in the distance S with the displacement sensor 4c installed above. That is, if the value of S decreases, L increases according to the amount of change, and if the value of S increases, L decreases according to the amount of change. That its + and according to the S dimension has been caught by the sensor 4c - the imaging device 4a and the inspected surface by changing the L dimension in opposite distance of the sheet K ₁ will be to maintain a constant spacing. In this case, the operation mechanism of the control method and the interval adjusting means 4b sends a control command to the servo motor provided in the interval adjusting means 4b via a control device (not shown), which is detected by the sensor 4c. The servo motor rotates so as to keep the imaging device 4a at a constant interval in response to the control command, and the position of the imaging device 4a is adjusted by a mechanism that converts rotational motion such as rack and pinion into linear motion.

  In addition, when this inspection part 23 is installed between the punching part 22 and the scrap removing part 24 as in the conventional case, the waste portion remains inside the punching molding, so that the surface to be inspected is printed. This is effective for inspecting printing defects such as misalignment, smearing, and fading, but it is difficult to determine the quality of the entire punched shape. However, if it is installed between the punching portion 22 and the scrap removal portion 24, it is possible to determine when the portion of the waste that should not be removed at the punching portion has separated for some reason.

On the other hand, when this inspection part is installed after the scrap removal part, in addition to defects on the printing surface, there is an advantage that a defect in punching molding can be inspected at the same time. If it is not completely separated for some reason, it is scattered, or it adheres to the sheet K ₁ and passes through the inspection area by the camera 4a, it is difficult to determine whether it is scrap or defective punching. Even if there is a problem that a trouble of judging the product as a defective product occurs, such a case is usually rare, so it is more practical to install it after the punching part 22 and before the scrap removing part 24 Is.

Also, here we established the imaging device 4a of the inspection mechanism 4 on the lower side of the transfer line of the sheet K _1, but the displacement sensor 4c described an example in which installed on the upper side, be provided on opposite this desired It can be installed on both the upper and lower sides.

Next, the sheet K ₁ conveyed to the scrap removing section 24 is temporarily stopped, and the connecting portion of the non-product portion is cut while leaving the gripper margin and the product portion held by the gripper bar 7e by the scrap dropping members 3a and 3b. Then, the non-product part is removed, and the sheet K ₂ having only the gripper margin and the product part is conveyed to the defective product removing unit 25.

Next, the structure of the defective product removing unit 25 will be described.
4 and 5 are side views for explaining an example of the operation of the defective product removing unit 25. FIG. In this figure, the sheet K ₂ conveyed from the residue removing unit 24 to the defective product removing unit 25 is only the gripper margin and the product portion. The defective product removing unit 25 is provided with a sheet release mechanism 9b that releases the gripped state.

Further, the defective product removing unit 25 includes a sheet support 9a serving as a temporary receiver for receiving about 80% of the sheet. The sheet support 9a is a cloth-like material such as polyester or nylon, and is made of a smooth material having no protrusions on the surface. The sheet support 9a is made during normal operation always state as receive the sheet K _2, i.e. a working state.

Furthermore, the defective product removal unit 25, by depositing a sheet K ₂ released from the gripper bar 7e by the sheet release mechanism 9b, a conveyor 9c driven by a motor 9d for unloading from cabin punching machine to the outside Yes. As a result, the operator can safely receive the sheet K ₂ released from the gripper bar 7e by the intermediate sheet releasing mechanism 9b.

Next, a series of operations of each mechanism provided in the defective product removing unit 25 will be described in more detail.
During normal operation, the defective product removal unit 25 does not function, but (1) when the defective device with printing stains and scratches is determined by the imaging device 4a provided in the inspection unit 23, (2) by the imaging device 4a provided in the inspection unit 23, when determining the occurrence of a deviation of the printing and punching position, the operation by the operation button when you want optionally removed sheet K ₂ that has been conveyed (3) When an optional sheet is taken out, (4) when the product finish is confirmed every arbitrary number of sheets during automatic operation, the release mechanism is operated and in that case the defective product removal unit is activated A control device 9d is provided. When the non-product portion of the sheet K ₂ that has been determined to be defective or the sheet K ₂ that is desired to be removed is dropped by the waste removal unit 24 and the gripper bar 7e holds the sheet K ₂ to the next defective product removal unit 25 the remains in the seat support 9a is activated condition of, for gripper bar 7e does not fall to the conveyor 9c having a by which the sheet K ₂ is deposited ability to grasp, unable to support the sheet K ₂ position, i.e. to the accommodated state operate with the seat support 9a so as to be dropped into the conveyor 9c sheet K ₂ is provided with a deposit function is activated.

That is, while the gripper bar 7e is carrying sheet K ₂ to the defective product removal unit 25 while holding the sheet K _2, the conveyor 9c which also comprises a deposition function sheet support 9a is possible to drop the sheet K ₂ Operates into the stowed state as possible.
Then, the gripper bar 7e gripping the sheet K ₂ paused reached the defective removing unit 25, the deposition functions to release the sheet K ₂ from gripper bar 7e by the sheet release mechanism 9b defective removing unit 25 The sheet K ₂ composed of the gripper margin and the product portion falls on the conveyor 9 c provided.
This series of operations, gripper bar 7e not gripping the sheet K ₂ by defective removing unit 25 is sent in a state of not gripping the sheet K ₂ to a product recovery section 26 as the next step.

At the same gripper margin K ₄ and product portion K ₃ leaving sheet K ₂ defectives removing the non-product part scrap removal unit 24 in a state the gripper bars 7e which are provided at regular intervals at the same time gripping the next sheet K ₂ It is conveyed to the removal unit 25.
During the conveyance of the next sheet K ₂ , the sheet support 9 a of the defective product removing unit 25 returns from the stored state to the operating state, and then operates so that the sheet K ₂ does not fall onto the conveyor 9 c having a stacking function. .

The presence of the sheet support 9c, the pause gripper bars 7e which has been conveyed by gripping the sheet K ₂ that is the gripper margin K ₄ and product portion K _3, the gripper margin K ₄ and product parts that do not need to take out trying to drop into a conveyor 9c which K ₃ is provided with a deposition function, or bent, without falling into the conveyor 9c having a deposition function, also the sheet K without being inhibited by the conveyor to the next product recovery section 26 ₂ can be transported.

The sheet K ₂ that has been released from the gripper bar 7e by the above series of operations and dropped onto the conveyor 9c having a stacking function is discharged out of the apparatus one by one or plural sheets. The state of the product portion K ₃ can be confirmed without stopping the machine, and during preparation for operation, the sheet K ₂ that is almost in the product state with the waste separated is transferred from the product recovery unit 25 to the conveyor 6. The state of the product part K ₃ can be confirmed immediately without waiting for the product to be carried out.

Finally, the sheet K ₂ gripped and conveyed by the gripper bar 7 e leaving the gripper margin K ₄ and the product portion K ₃ to the product recovery unit 26 is temporarily stopped and held by the gripper bar 7 e by the product recovery member 5 a. leaving gripper margin K ₄ parts by cutting the tie between the product portion K ₃ conveys the product portion K ₃ is deposited to the cradle 5b, the gripper bars 7e the gripper margin recovery unit 8 while holding the gripper margin K ₄ as it And the gripper margin K ₄ is recovered.

In product recovery unit 26, by performing this operation continuously, sequentially and sheet K ₃ made products are deposited on the cradle 5b, when a certain number of sheets, ejecting the product portion K ₃ deposited to pedestal 5b provided with a conveyor 5c performs a lowering operation the product sheet K ₃ which is deposited to a product height of discharge conveyor 6 which is installed in the next step of product recovery unit 26 for dispatching to the next step, the product discharge When lowered to the height of the conveyor 6 has been completed, by operating the conveyor 5c which are provided in the cradle 5b, the product portion K ₃ deposited are sent to the product discharge conveyor 6 that fed to the next step.

Depending defective removing unit 25 does not grip the sheet K ₂ when the gripper bar 7e is transported to a product recovery unit 26, the product recovery member 5a, the sheet S to be punched in the same manner as punching unit 22 and the scrap removal unit 24 Always working with or without ₁ .
Further, the defective product removal unit 25 to release the sheet K ₂ when a gripper bar 7e not gripping the sheet K _2, but moves to a product recovery section 26 in a state that does not directly grip the sheet K _2, There is no problem with driving.

  The present invention is useful for producing an assembled base paper such as a punched paper box or a packaging box by embossing a plate-like member such as a cardboard sheet, cardboard, or film.

The side view which shows the typical example of the apparatus used suitably in this invention method. The top view which shows the change of each shape from the raw material sheet | seat in each process of this invention method to a product sheet | seat. The side view of a test | inspection part. The side view of the action state of a defective article removal part. Side view of storage state of defective product removal unit

Explanation of symbols

S ₁ , K ₁ , K ₂ Sheet K ₃ Product part K ₄ Gripper margin 2 a Upper fixed plate 2 b Movable plate 2 c Vertical movement means 3 a, 3 b Waste drop member 4 a Imaging device 4 b Interval adjustment means 4 c Displacement sensor 5 a Product recovery member 5 b Table 5c Conveyor 6 Conveyor 7 Sheet transport mechanism 7e Gripper bar 8 Gripper margin collection unit 9a Sheet support 9b Opening mechanism unit 9c Conveyor 9d Control device 21 Paper feed unit 22 Punching unit 23 Inspection unit 24 Waste removal unit 25 Defective product removal unit 26 Product recovery Part

Claims (2)

  A carton sheet supply process that takes out one sheet from the printed carton sheet pile and sends it to the next process, a punching process that punches the supplied carton sheet along the printed contour, leaving only the joints, and a punching process Sent from the inspection process to determine whether the carton sheet is non-defective or defective, the waste removal process to remove the unnecessary part from the carton sheet that has been punched after inspection, and the waste removal process In the carton blank manufacturing method including the defective product removing step of selectively removing only defective products from the coming carton blank and depositing on a predetermined cradle and the product recovery step of recovering the carton blank product, imaging in the inspection step The mechanism should be moved according to the vertical movement of the carton blank, and the carton blank should be detected. The method performs substantially the inspection process while maintaining a constant distance, which tuned to where obtained information, characterized in that actuating the removal operation in defective product removing step between. A carton sheet can be pulled out from the stack of carton sheets one by one and fed to the next punching unit. The carton sheet sent from the feeding unit can be moved up and down with the upper part as the cutting blade. The punching part with a mechanism for punching into a predetermined shape configured as a support plate, and the carton sheet after punching move up and down corresponding to the vertical movement of the surface to be inspected, and the distance from the surface to be inspected is substantially constant An inspection unit with an image pickup mechanism that can be held, a scrap removing unit with a mechanism for removing unnecessary portions from a carton sheet after punching, and only defective products are taken out from the information of the inspection unit and deposited on a predetermined cradle. A defective product removing unit having a mechanism, a product collecting unit having a mechanism for depositing a non-defective carton blank that has passed through the defective product removing unit on a predetermined receiving table, and a plurality of sheets for moving the sheet between the above parts Gripper bar automatic platen punching device, characterized in that it comprises a sheet conveying mechanism which consists of an endless chain which is fixed at regular intervals.

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