JPH046517B2 - - Google Patents

Abstract

PURPOSE:To efficiently eject defective sheets by detecting defective positions of a continuous sheet before a cutter cuts it, performing its position management, and controlling th operation of a deflector in a corrugating machine. CONSTITUTION:Defects of half-corrugated fiberboard sheets 1, 2, a surface liner 5, and a continuous sheet 8 are detected by an aluminum foil existence detecting proximity switch 12, ear rub defect detectors 13, 14, image sensors 15-18, 22, 23, and proximity switches 19-21, 24 before they are cut by a rotary cutter 11, and defects are fed to a defect removing device 25. Defect occurrence positions are managed until defective sheets are ejected by a deflector 26 based on signals of a shift speed detector 28, and the deflector 26 is switched to the ejection side when defect occurrence positions pass the rotary cutter. Accordingly, defective sheets can be ejected very correctly and efficiently without lowering the shift speed of the continuous sheet.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for removing defective sheets, and in particular, in the production of corrugated cardboard sheets using a corrugating machine, after cutting them into predetermined lengths with a cutter, they are pasted together. The present invention relates to a defective sheet removal method for removing cut sheets having defects such as defects from a production line.

[Prior art and problems to be solved by the invention]

In recent years, corrugating machines have become more and more popular due to market needs.
In order to lower costs and improve quality, high-speed operation has been adopted, and mechanical performance has been improved to reduce the occurrence of defects. However, the following unavoidable defects and defects due to other factors still occur.

(1) Spliced portion of the liner and core of one corrugated sheet of a double-sided corrugated sheet (2) Spliced portion of the liner and core of the other corrugated sheet of the double-sided corrugated sheet (3) Spliced portion of the front liner (4) Misalignment between the liner and the core in (1) above (misalignment of the bonding position between the liner and the core) (5) Misalignment between the liner and the core in (2) above (6) Above ( (2) Misalignment between the corrugated sheet and the front liner (7) Poor adhesion between the liner and core of the corrugated sheet (1) above or defects in the paper itself (8) Poor adhesion to the core or the result of the paper itself (9) Poor adhesion between the single corrugated cardboard sheet in (1) above, the single corrugated cardboard sheet in (2) above, and the front liner, or the result of the paper itself in the front liner. Defects (10) Defects that inevitably occur at the start of processing due to order changes for Slitsuta scorers On the other hand, conventional methods for removing defective sheets include those disclosed in JP-A-54-117291 and JP-A-55-
The invention described in Publication No. 113548 is known. The invention described in JP-A-54-117291 is
When a defective product is detected by a defective product detector located a distance equal to the specified cutting length from the rotary cutter, the defective product is cut to a length shorter than the specified cutting length and then removed by the action of a flapper.
However, since this invention uses a method to detect defective products at a distance equal to the specified cutting length from the rotary cutter, defective products are detected and cut unless the cutting length is predetermined. It is not easy to remove it after doing so. In other words, after the specified cutting length is changed due to an order change, the position of the defective product detector must be changed to correspond to the changed cutting length. is several tens of centimeters to 4
The range of order changes is extremely wide, as indicated by the length of ~5 meters or more, and it is not easy to change the position of the defective product detector to accommodate this.
Furthermore, no consideration is given to the correlation between the time from the start of the flapper's operation to the end of its operation and the transport speed of the corrugated sheet, and even though it is suitable for transporting corrugated sheets at low speed, It is unsuitable for transporting by . In other words, in recent years, corrugated sheets have been transported at high speeds in order to improve operation rates, etc. However, with such high-speed transport, even if a cut sheet with a defective part reaches the flapper, the flapper The operation is not completed, and the cut sheet with the defective part is transported in the same direction as the good corrugated sheet and cannot be removed, and conversely, the cut sheet with the defective part is removed. Even though the next good corrugated cardboard sheet has reached the flapper, the return movement of the flapper is not completed, and undesirable situations may occur if the good corrugated cardboard sheet is carelessly removed. . On the other hand, Japanese Patent Application Publication No. 1983
- The invention of Publication No. 113548 is that when an operator visually confirms a defective product, the operator presses a push button and uses a cutting signal from a rotary cutter to tilt one side of the guiding sandwich conveyor downward to cut the defective product. It is intended to remove. However, this invention only allows an operator to confirm defective products, but does not automatically detect defective locations, and has not yet satisfied recent demands for automation. In addition, the invention described in Japanese Utility Model Publication No. 54-16448 has already been proposed, but this invention, like the invention described in the above-mentioned Japanese Patent Application Laid-Open No. 55-113548, allows an operator to identify defective products and remove them. Moreover, the seesaw conveyor that performs the removing operation is not one in which the tilting is controlled in accordance with the transport speed of the corrugated paperboard sheet, and therefore, like the above-mentioned inventions, it is not possible to automatically detect defective products. However, the present invention has not yet been able to satisfy the desire to control the removal mechanism in accordance with the transport speed of the corrugated cardboard sheet to remove defective products more accurately and efficiently.

Therefore, in view of the above circumstances, the present invention is capable of controlling a deflector so that cut sheets having defective areas can be effectively discharged even by increasing the transfer speed, and also allows defective areas to be removed from continuous sheets or cut sheets. By tracking and managing the position that is displaced as the sheet is transported, the detector for detecting defects can be installed at will without being restricted by the installation location, that is, detecting defects according to the type. It can be installed in a position where it is easy to cut, and even if the cutting length is changed when cutting from a continuous sheet, it is easy to know which cut sheet contains a defective part or not, and it can follow the movement position as it is transported. It is an object of the present invention to provide a manageable method for removing defective sheets.

[Means to be solved by the invention]

The present invention has been made to achieve the above-mentioned object, and a detector detects a defective part from a continuous sheet being transferred, and inputs the detected value to a defective part management counter. The position of the defective part is constantly tracked as the continuous sheet is transferred by taking in the transfer speed of Before the continuous sheet is cut to a predetermined length with a cutter, it is determined whether or not a defective spot exists at any position on the continuous sheet, looking back from the currently cut sheet, After the part of the continuous sheet with the defective part is cut by the cutter, the defective sheet management counter detects the starting end and the part of the continuous sheet with the defective part based on the sheet transport speed and the judgment result of the defective sheet judgment section. The position of the end of the cut sheet that is displaced over time is determined, and then, based on this determined information, the operation judgment unit determines that the starting end of the cut sheet with the defective area has reached a position that is close enough to the operating time required for the deflector to open and eject. or not,
Further, it is characterized in that it is determined whether the rear end of the cut sheet having a defective part has reached a position just before the time required for the deflector to close, and the drive of the deflector is controlled based on the result of this determination. The present invention is characterized by a method for removing defective sheets.

〔Example〕

Hereinafter, one embodiment of the method for removing defective sheets according to the present invention will be described based on the drawings. FIG. 1 shows the main parts of a corrugating machine that implements the removal method. In Fig. 1, single corrugated cardboard sheets 1 and 2 unwound from a single-face (single-sided) corrugated cardboard sheet manufacturing section are passed through a brake device 3 for applying tension to a preheater 4, and a front liner 5 is transferred from a base paper roll to a preheater 4. The paper is sent to the preheater 4 via the paper splicing device. After the glue is transferred from the preheater 4 by a glue machine 6, the single corrugated cardboard sheets 1 and 2 and the front liner 5 are pasted together by a double facer 7 to form a double faced (both sides) continuous sheet 8, and then It is sent to a rotary cutter 11 via a first slit scorer 9 and a second slit scorer 10 equipped with trim shears. While being fed into the rotary cutter 11, defect detectors 12 are placed at various locations.
When various defects are detected in steps 24 to 24, the defect removal control device 25 detects the location of the defective portion as the single corrugated sheets 1 and 2, the outer liner 5, and the continuous sheet 8 are transported at high speed. track and manage. After cutting into predetermined lengths with the rotary cutter 11, when the starting edge of the cut sheet with the defective part reaches a predetermined near position corresponding to the operating time of the deflector 26, that is, the operating timing position, the deflector 26 opens to eject. When the operation is started and the starting end of the cut sheet with the defective area reaches the deflector 26, the discharge opening operation of the deflector 26 has been completed, and the cut sheet with the defective area is removed from the production line. When the rear end of the cut sheet with the defective part reaches a predetermined front position corresponding to the operating time of the deflector 26, the deflector 26 starts its return operation, and when the starting end of the next good cut sheet reaches the deflector 26, The return operation of the deflector 26 has been completed, and the cut sheets of good quality are sorted by a sorting device 27 consisting of a later side conveyor, etc.
It is becoming more and more common to be sent to Further, the tracking and management of the defective portion is performed based on a pulse signal outputted from the transport speed detector 28 in accordance with the transport speed of the continuous sheet 8.

Next, an example of an apparatus for carrying out the above method for removing defective sheets will be described. First, the defect detector 12 that detects (1) to (3) of the defect factors (1) to (10) described in the section of the prior art and problems to be solved by the invention is located at the rear of the double facer 7. It is disposed in front of the first slit scorer 9. The defect detector 12 detects the presence of aluminum foil stuck to each paper joint part using a proximity switch. Detect. Failure detectors 13 and 1 that detect the above failure factors (4) and (5)
4 is disposed in front of the brake device 3 for ease of detection by a photoelectric sensor or the like. Failure detectors 15 to 1 that detect the above failure factors (7) and (8)
8 uses an image sensor or the like and is disposed in front of the preheater 4 for ease of detection. Defect detector 19 for detecting the above defect cause (6)
21 is disposed between the glue machine 6 and the double facer 7 for ease of detection by a proximity switch such as a photoelectric type. The defect detectors 22 and 23 for detecting the above defect factor (9) include an ultrasonic bonding state detector and an image sensor for the front liner 5.
This is combined with a detector that detects paper defects.
It is arranged at the outlet of the double facer 7. The defect detector 24 for detecting the defect factor (10) is as follows:
The cutting operation by the trim shear is detected by a proximity switch, which is attached to the first slit scorer 9. Furthermore, since there are cases of failure factors that require operators to rely on visual inspection and sampling inspection, it is necessary to perform an interrupt operation in which, for example, the item currently being cut is immediately defective. Push buttons 29 and 30 are provided at suitable locations such as in front of the slotted scorer 9.
In front of the rotary cutter 11, a continuous sheet 8
A transfer speed detector 28 is disposed to detect the transfer speed of the rotary cutter 11, and a second transfer speed detector 31 is disposed behind the rotary cutter 11. The second transfer speed detector 31 is connected to the lap conveyor 32.
This is to control the operation of the The defect detectors 12 to 24, push buttons 29 and 30, and transfer speed detectors 28 and 31 are respectively connected to the defect removal control device 2.
5. A cutter control operation panel 34 and a removal control operation panel 35 are connected to the defect removal control device 25 . Defect removal control device 25
is the backstopper 36 and the side delivery conveyor 37.
It has also come to control the movements of the Furthermore, the first
In the figure, 46 is a sandwich conveyor that applies tension to the sheet cut by the rotary cutter 11, 47 is a lamp that indicates that a defective sheet is being discharged, and 48 is a lamp that indicates that defective parts are being managed.

Next, the defect removal control device 25 shown in FIG. 2 will be explained.
It is connected to a defective sheet determining section 39 via 8n. The defective part management counters 38a to 38n and the defective sheet determining section 39 include the transport speed detector 28.
The pulse signal from the The defective sheet determining section 39 includes a transport speed detector 2.
A cutting length counter 40, which operates in response to a pulse signal of 8 and a cutting signal from a cutting detector 33 that detects cutting by the rotary cutter 11, is connected via a cutting length register 41. There is. In addition, cutting length data can also be inputted to the defective sheet determining section 39 from the outside. Defective sheet management counters 43 a to 43 n are connected to the defective sheet determining section 39 via a defective sheet registration gate 42 . Defective sheet management counter 43a
43n is for managing cut sheets with defective parts, particularly from the rotary cutter 11 to the deflector 26, that is, defective sheets.
A drive unit 45 that drives the deflector 26 is connected to the defective sheet management counters 43 a to 43 n via a discharge operation determination unit 44 .

Next, to explain the operation, the continuous sheet 8 is transported at high speed before being cut by the rotary cutter 11.
When some kind of defect occurs in a part of the defective part, the defective detectors 12 to 24 corresponding to the cause of the defect detect it, and this detection signal is sent to the defective part management counters 38a to 38n. The operator discovers the defect and presses button 2.
When buttons 9 and 30 are pressed, detection signals are also sent from the push buttons 29 and 30 to the corresponding defective part management counters 38a to 38n. Defective part management counters 38a to 38
n is as the continuous sheet 8 is transported at high speed in response to a pulse signal from the transport speed detector 28.
The location of the defective part is tracked over time, and management is carried out to always know where the defective part is located. Therefore, the defective part management counter 38a~
38n, when multiple defects occur in one place,
These various types of defects are detected by the respective defect detectors 12 to 2.
4, and the transfer position can be managed in such a manner that each detected defect is independently overlapped with each other, and furthermore, with some of the detected defects overlapped with each other. The defective part management counters 38a to 38n collect positional information over time of the starting edge and trailing edge of the defective part from the defective sheet determining unit 3.
Send to 9. Upon receiving the information from the defective part management counters 38a to 38n, the defective sheet determination unit 39
Based on the cutting signal of the rotary cutter 11 and information on the predetermined cutting length, the rotary cutter 1
Before cutting according to step 1, it is determined which sheet from the currently cut sheet there is a defective part, and how many sheets there are defective sheets, and the position is managed over time. conduct. The defective sheet determining section 39 sends information on defective sheets as described above to the defective sheet registration gate 42 . The defective sheet registration gate 42 determines the chronological position of the starting edge and trailing edge of each defective sheet managed by the defective sheet determination unit 39, and transmits this position information to defective sheet management counters 43a to 43a for each defective sheet.
Send to 43n. Defective sheet management counter 43a~
43n manages the positions of the starting and trailing ends of each defective sheet over time, particularly from the rotary cutter 11 to the deflector 26.
The information in the defective sheet management counters 43a to 43n is sent to the discharge operation determination section 44. The discharge operation determination unit 44 determines whether the starting edge of the defective sheet has reached a position in front of the deflector 26 corresponding to the time from the start of the discharge opening operation of the deflector 26 to the end of the operation, and if it has reached the position, the discharge operation is performed. It outputs an opening operation signal, and also determines whether the rear end of the defective sheet has reached a position before the operation time of the deflector 26, and if so, outputs a return signal. The drive unit 45 receives the above-mentioned signals from the discharge operation determination unit 44 and controls the operation of the deflector 26.

Therefore, since the above-mentioned device manages the location of defective sheets and the position of defective sheets over time, it is possible to maintain accuracy even if the transport speed of the continuous sheet 8 is changed or the specified length to be cut is changed. Defective sheets can be removed quickly and effectively.

Specifically, the state in which defective sheets are removed will be explained based on FIGS. 3 and 4. In FIG _. This shows a short case. In FIG. 3, the rotary cutter 11 sequentially cuts the continuous sheet 8 into predetermined lengths, and the cut sheet _S1 having a defective part, that is, the defective sheet _F1, is cut by the rotary cutter at time _t1 . It is assumed that it is immediately after being cut by the cutter 11. It goes without saying that the positions of defective parts and defective sheets are managed over time as described above. time t ₂
At this time, the discharge operation determination unit 44 determines that the starting end of the defective sheet _F1 has reached the operation timing position of the deflector 26, and based on this determination, the deflector 2
6 starts the discharge opening operation. At time _t3 , the starting end of the defective sheet _F1 has not reached the deflector 26,
In other words, even though the discharge opening operation of the deflector 26 has not been completed, the rear end of the defective sheet F ₁ reaches the position of the deflector 26 operation timing, the deflector 26 starts the return operation, and the deflector 26 returns. During operation, the starting edge of the defective sheet F ₁ reaches the deflector 26, and after the defective sheet F ₁ is removed at time t ₅ , the operation of the deflector 26 is completed. FIG. 4 shows an example where the length to be cut is longer than the distance between the rotary cutter 11 and the deflector 26, and at time t ₆ , after the preceding good sheet S ₂ is cut by the rotary cutter 11. , even if the defective sheet F ₂ is not cut at time t ₇ ,
The starting end of the defective sheet _F2 reaches the position of the power timing of the deflector 26, and the deflector 26 thereby starts the discharge opening operation. At time t ₉ after passing time t ₈ , the position of the deflector 26 is reached and removal of the defective sheet F ₂ is started. After the defective sheet F ₂ is cut by the rotary cutter 11 at time t ₁₀ , when the rear end of the defective sheet F ₂ reaches the operation timing position at time t ₁₁ , the deflector 26 starts the return operation. At time t ₁₂ , the defective sheet F ₂
The removal of the deflector 26 is completed, and the return operation of the deflector 26 is also completed.

In FIG. 1, when there is an order change such as a change in machining dimensions, information on the machining start point by various other machining devices such as the first and second slit scorers 9 and 10 is displayed on the cutter control operation panel 34, etc. from the continuous sheet 8 to the defect removal control device 25.
The position of the processing start point for the sheet is controlled, and the sheet is removed as a defective sheet by the deflector 26.
In addition, the defect removal control device 2 is connected to the removal control operation panel 35.
It is also possible to manually eject the cut sheets by supplying a forced ejection signal to 5, and information on the number of defective sheets and non-defective sheets is supplied from the defect removal control device 25 to the removal control operation panel 35 and cutting is performed. The number of sheets is managed.

〔Effect of the invention〕

As described above, according to the method for removing a defective sheet according to the present invention, the defective portion is detected and its position is monitored over time until it is cut into predetermined lengths and discharged from the production line by a deflector. In addition, since the operation determining section controls the opening and returning operations of the deflector according to the position of the cut sheet where the defective part is located, the cut sheet is being transported at high speed, and the deflector is Even in situations where it takes time to open and return, it can be ejected efficiently without any reduction in transfer speed, and at this time, the following or previous good sheets are never accidentally ejected, making it easy to use. It is extremely convenient to do so. When a defective point is detected in a continuous sheet, it constantly tracks and monitors the position of the defective point in the continuous sheet as it is displaced as the continuous sheet is transported. Especially when detecting various types of defects that occur during the manufacturing process of corrugated cardboard sheets, it is important to install dedicated detectors in positions that are easy to detect according to each type. It's convenient. Furthermore, in order to track and monitor the position of defective parts in continuous sheets, the defective part management counter takes in the transport speed of the continuous sheets, so even if the transport speed of continuous sheets is changed, it can be managed sufficiently and accurately. Therefore, the next cut sheet having a defective portion can be discharged with high precision. Furthermore, the defective sheet determination section determines in advance at which position in the continuous sheet the defective part exists before being cut by the cutter, and determines in advance whether or not the defective part exists in the continuous sheet before being cut by the cutter. Even by high-speed transfer, it is possible to secure time for calculating the location of defective parts and other control operations. Furthermore, even if the length cut by the cutter is changed, during the above-mentioned indexing process in the defective sheet determination section, it is possible to determine which cut sheet contains the defective portion by simply changing the preset cutting length. can be determined.

[Brief explanation of drawings]

The drawings show an embodiment of the method for removing defective sheets according to the present invention. FIG. 1 is a block diagram of the method of removing defective sheets applied to a corrugating machine, and FIG. 2 is a configuration diagram of a control device for removing defective sheets. Figure 3 is an explanatory diagram of the operation when discharging a defective sheet whose length is shorter than the distance between the rotary cutter and the deflector, and Figure 4 is an illustration of the operation when discharging a defective sheet whose length is shorter than the distance between the rotary cutter and the deflector. It is an explanatory diagram of the operation when discharging the. 11-24...Fault detector, 25...Fault removal control device, 26...Deflector, 29, 30...
Push button.

Claims (1)

[Claims] 1. A detector detects a defective part from the continuous sheet being transferred, and inputs the detected value to a defective part management counter. The position of the defective part is constantly tracked, and the defective sheet determination unit takes in the defective part output by the defective part management counter, and cuts the continuous sheet to a predetermined length with a cutter based on a preset cutting length. Before the cut sheet is cut at the present time, it is determined whether or not there is a defective part at any position on the continuous sheet, and after the part of the continuous sheet with the defective part is cut with the cutter, , a defective sheet management counter determines the position of the starting and ending ends of the continuous sheet having a defective portion based on the sheet transport speed and the determination result of the defective sheet determining section, and then this index is performed. Based on this information, the operation judgment unit determines whether the starting edge of the cut sheet with the defective area has reached the position before the deflector takes the operating time required for the deflector to eject and open. A method for removing a defective sheet, comprising: determining whether the sheet has reached a position that is close enough to the time required for the closing operation, and controlling the drive of a deflector based on the determination result.