JPS61277558A - Removing method for defective sheet - 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 [Field of Industrial Application] 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 the sheets into predetermined lengths with a cutter, The present invention relates to a method for removing defective sheets, which removes cut sheets having defective parts such as misalignment from a production line.

[Conventional technology]

In recent years, market needs have encouraged corrugating machines to be divided into smaller lots that can be freely connected to each other, and they have also started to operate at high speeds in order to lower costs and improve quality.
Efforts are also being made to improve mechanical performance in order to reduce the occurrence of defects. However, the following unavoidable defects and defects due to other factors still occur.

(1) The liner and core joint of one corrugated board sheet of a double face (2) The liner and joint of the other corrugated board sheet of a double face (3) The joint of the printed liner (4) Above Misalignment between the liner and the core in (1) (
Misalignment of bonding position between liner and core) (5) (2) above
(6) Misalignment between the liner and core of the single corrugated cardboard sheet in (2) above (7) Poor lamination between the liner and core of the single corrugated cardboard sheet in (1) above or paper Defects in itself (8) Poor bonding between the liner and core of the single corrugated cardboard sheet in (2) above and defects in the paper itself (9) Single corrugated cardboard sheet in (1) above, single corrugated cardboard sheet in (2) above, and Poor adhesion between the front liners and defects in the front liner paper itself (to) Defects that inevitably occur at the start of processing when changing orders for the Slitsuta scorer. As a method of removing, Japanese Patent Application Laid-Open No. 54-117291 and Japanese Patent Application Laid-Open No. 55-1135
The invention described in Publication No. 48 is known.

The invention described in Japanese Patent Application Laid-Open No. 54-117291 is that when a defective product is detected by a defective product detector located a distance away from the rotary cutter in front of the rotary cutter by a distance equal to the specified cutting length, a defective product is detected with a length shorter than the specified cutting length. After shredding, the pieces are removed by the action of a flapper. However, this invention
Since this method detects defective products at a distance equal to the specified cutting length from the cutter, it is not possible to detect defective products and remove them after shredding, unless the cutting length is predetermined. It's not easy. In other words, when the specified cutting length is changed due to an order change, the position of the defective product detector must be changed in comparison to the changed cutting length.
Moreover, even if the position is changed, the range of order changes is extremely wide, with the above-mentioned cutting length ranging from several tens of centimeters to 4 to 5 meters or more, and the position of the defective product detector must be changed to accommodate this. is not easy. Furthermore, there is no consideration given to the interrelationship 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 It is not suitable for high-speed transport. In other words, in recent years, cardboard sheets have been transported at high speeds in order to improve operation rates, etc. However, with such high-speed transport, even if shredded sheets with defective parts reach the flapper, The flapper operation has not been completed, and the shredded sheet with defective areas is transported in the same direction as the good corrugated sheet and cannot be removed, or conversely, the shredded sheet with defective areas cannot be removed. I was disappointed,
Even though the next good corrugated pole sheet has reached the flapper, the return operation of the flapper is not completed, and an undesirable situation may occur where the good corrugated sheet is carelessly removed. . On the other hand, JP-A-55-
In the invention disclosed in Japanese Patent No. 113548, 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 sandwich conveyor for guiding the sandwich downward to remove the cut sheet containing the defective part. It is intended to remove. However, this invention only allows an operator to check whether the cine is in good condition, but does not automatically detect defective parts, and has not yet satisfied the recent demands for automation. In addition, an invention described in Japanese Patent Application Laid-open No. 54-16448 has already been proposed;
Similar to the invention described in the publication, the operator identifies defective products and performs the removal operation, and the tilting of the seesaw conveyor that performs the removal operation is controlled in accordance with the transport speed of the corrugated cardboard sheets. Therefore, in order to satisfy the demand for automatic detection of defective products and control of the removal mechanism in accordance with the transport speed of the corrugated paperboard sheet, as in the above-mentioned inventions, to remove defective products more accurately and efficiently. This is something that has not yet been achieved.

[Problem to be solved by the invention]

In view of the above circumstances, the present invention provides a defective product detector that can be installed at a position where defects can be most easily detected, and that tracks and manages defective locations as the corrugated sheet is transported.
It is an object of the present invention to provide a method for removing defective sheets that can accurately and efficiently remove cut sheets having defective parts after cutting with a cutter without reducing the transport speed.

[Means to be solved by the invention]

In order to achieve the above object, the present invention detects defective parts from a continuous sheet being transported, constantly tracks the position of the defective parts as the sheet is transported, and after cutting the sheet with a cutter. , when the starting end of the cut sheet with the defective area reaches the position before the deflector manufacturing time, the deflector performs the ejection opening operation kL, and when the rear end of the cut sheet with the defective area is located, the deflector The present invention is characterized by a method for removing defective sheets that performs a return operation.

〔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-face corrugated sheets 1 and 2 unwound from a single-face corrugated 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. It is sent to the preheater 4 via the joint. After the glue is transferred from the preheater 4 by a glue machine 6, the single corrugated cardboard sheet 1.2 and the front liner 5 are bonded to each other by a double facer 7 to form a double-faced continuous sheet 8, and then a trim shear is applied. It is sent to the rotary cutter 11 via a first slit scorer 9 and a second slit scorer 10 equipped with a slitting device. When various defects are detected by the defect detectors 12 to 24 arranged at various places while being fed into the rotary cutter 11, the defect removal control device 25 controls the single corrugated cardboard sheet (1.2) and the table. Liner 5 and also continuous sheet 8
As the parts are transported at high speed, the location of defective parts is tracked and managed. After cutting into predetermined lengths with the rotary cutter 11, the starting end of the cut sheet with the defective part is at a predetermined near position corresponding to the operating time of the deflector 26, and then t6.
When the operation timing is reached, the deflector 26 starts the ejection opening operation, and when the starting end of the cut sheet with the defective area reaches the deflector 26, the deflector 26
The ejection opening operation has been completed and the defective cut sheet 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, After the return operation of the deflector 26 has been completed, the cut sheets of good quality are sent to a section consisting of a later horizontal delivery conveyor, etc., to a device 27. Tracking and management of the defective portions described above 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 for detecting failure factors (1) to (3) among the above-mentioned failure factors (1) to a4 is arranged behind the double facer 7 and in front of the first slitter scorer 9. There is. The defect detector 12 detects the presence of aluminum foil stuck to each paper joint part using a proximity switch. Detect paper joints. Failure detector 1 that detects the above failure factors (4) and (5)
3.14 is arranged in front of the brake device 3 for ease of detection by a photoelectric sensor or the like. Failure detectors 15 to 18 that detect the above failure factors (7) and (8)
uses an image sensor, etc., and is disposed in front of the preheater 4 for ease of detection. The defect detectors 19 to 21 for detecting the defect factor (6) described above are installed in the glue machine 6 due to the ease of detection using a proximity switch such as a photoelectric type.
and the double facer 7.

The defect detectors 22 and 23 for detecting the defect factor (9) are a combination of an ultrasonic bonding state detector and an image sensor-based paper defect detector of the front liner 5.
It is arranged at the exit of the double facer 7. The defect detector 24 for detecting the defect factor (2) is attached to the first slit scorer 9 because it detects the cutting operation by the trim shear using a proximity switch.

Furthermore, since there are some failure factors that require the operator to rely on visual inspection or sampling inspection, it is also necessary to perform an interrupt operation such as when something that is 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. A transfer speed detector 28 for detecting the transfer speed of the continuous sheet 8 is disposed in front of the rotary cutter 11, and a second transfer speed detector 31 is provided behind the rotary cutter 11.
is installed. The second transfer speed detector 31 is for controlling the operation of the lap conveyor 32. The defect detectors 12 to 24, the push buttons 29, 30, and the transfer speed detectors 28 and 31 are respectively connected to the defect removal control device 25.
It is connected to the. A cutter control operation panel 34 and a removal control operation panel 35 are connected to the defect removal control device 25 . The defect removal control device 25 also controls the operations of the back stopper 36 and the side delivery conveyor 37. In addition, in FIG. 1, 46 is the rotary cutter 1.
1 is a sandwich conveyor that applies tension to the sheet to be cut; 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 rj! shown in FIG. 25, the defect detectors 12 to 24 and the push button 29.
30 is connected to a defective sheet determining section 39 via defective portion management counters 38a-38n. A pulse signal from the transport speed detector 28 is input to the defective part management counters 38a to 3&n and the defective sheet determining section 39. The defective sheet determining unit 39 includes a cutting length counter 40 that operates in response to a pulse signal from the transport speed detector 28 and a cutting signal from a cutting detector 33 that detects cutting by the rotary cutter 11;
It is designed to be connected via 1. Further, cutting length data can also be inputted to the defective sheet determining section 39 from the outside. The defective sheet determination unit 39 receives defective sheet management counters 43a to 4 via a defective sheet registration gate 42.
3n is connected. Defective sheet management counter 43a
43n is for managing particularly cut sheets with defective parts from the rotary cutter 11 to the deflector 26, and tb defective sheets. The defective sheet management counters 43a to 43n are connected to the deflector 26f and a drive unit 45 that drives the deflector 26f via a discharge operation determination unit 44.

Next, to explain the operation, when some kind of defect occurs in a part of the continuous sheet 8 that is being transported at high speed before being cut by the rotary cutter 11, the defect detector 1 corresponding to the cause of the defect occurs.
2 to 24 perform detection, and this detection signal is sent to defective part management counters 38a to 38n. When the operator discovers a defect and presses the push buttons 29, 30, a detection signal is sent from the push buttons 29, 30 to the corresponding defect management counters 38a to 38n. The defective part management counters 38a to 38n track the position of the defective part over time as the continuous sheet 8 is transported at high speed in response to a pulse signal from the transfer speed detector 28, and constantly check the position of the defective part. Management is carried out to control the position of each person. Therefore, when a plurality of defects occur at one location, the defective part management counters 38a to 38n can manage the transfer position in a state where these various defects are overlapped or even partially overlapped with each other. The defective part management counters 38a to 38n send positional information over time of the starting end and trailing end of the defective part to the defective sheet determining section 39. Upon receiving the information from the ζ defective part management counters 38a to 38n, the defective sheet determining unit 39 determines whether the sheet is cut before being cut by the rotary cutter 11 based on the cutting signal of the rotary cutter 11 and information on the predetermined cutting length. First, it is determined which sheet, starting from the currently cut sheet, has a defective spot, and which sheet is defective, and the position is managed over time. 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 starting and trailing edges of each defective sheet managed by the defective sheet determination unit 39 over time, and stores this position information on a defective sheet management counter for each defective sheet. 43a~
Send to 43H.

The defective sheet management counters 43a to 43n manage 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 is the discharge operation determination unit 44
The operation of the deflector 26 is controlled by receiving the above-mentioned signals from the deflector 26.

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

Figures 3 and 4 specifically show how defective sheets are removed.
To explain based on the figures, FIG. 3 shows the rotary cutter 1.
This shows a case where the length of the cut sheet S1 is shorter than the distance between the cut sheet S1 and the deflector 26. In FIG. 3, the rotary cutter 11 sequentially cuts the continuous sheet 8 into predetermined lengths, and cuts the cut sheet S! It is assumed that a cut sheet with a defective portion therein, that is, a defective sheet Fl has just been cut by the rotary cutter 11 at time t1.

It goes without saying that the positions of defective parts and defective sheets are managed over time as described above. Time 1. At this time, it is determined in the ejection operation determining section 44 that the starting end of the defective sheet Fx has reached the operation timing position of the deflector 26, and based on this determination, the shive lifter 26 starts the ejection opening operation. Defective sheet F at time t3! The starting end of the deflector 26
The rear end of the defective sheet (Fx) reaches the operation timing position of the deflector 26 and the deflector 26 starts the return operation even though the discharge opening operation of the tsumib deflector 26 has not been completed. , during the return operation of the deflector 26, the starting end of the defective sheet F1 reaches the deflector 26, and after the defective sheet Fs is removed in 1 s,
The operation of 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 t6, the previous good sheet S! is cut by the rotary cutter 11, a time t
Defective sheet F in γ! Even if the defective sheet F2 is not cut, the starting end of the defective sheet F2 reaches the operational timing position of the deflector 26, and the deflector 26 thereby starts the ejection opening operation. After time 1s, time 1. When the position of the deflector 26 is reached, the removal of the defective sheet Fs is started. And at time t1o, defective sheet F! After Fs is cut by the rotary cutter 11, when the rear end of the defective sheet Fs reaches the position of the operation timing at time tll, the deflector 26 starts the return operation. Time t1!
Now, the removal of the defective sheet F2 is completed, and the deflector 26
The return operation is also completed.

In FIG. 1, when there is a change in order such as a change in machining dimensions, information on the machining start point by various other machining devices such as the first and second slitter spars 9 and 10 is displayed on the cutter control operation panel 34, etc. The defect removal control device 25 controls the position of the processing start point for the continuous sheet 8, and the sheet is removed by the deflector 26 as a good sheet. Further, the defect removal control device 25 is connected to the removal control operation panel 35.
It is also possible to manually eject cut sheets by supplying a forced ejection signal to The number of sheets is managed.

〔Effect of the invention〕

As described above, according to the method for removing defective sheets according to the present invention, defective areas are detected from a continuous sheet before being cut by a cutter, and the defective areas are ejected by a deflector as the continuous sheet is transported. It is a device that transports and processes continuous sheets at high speed because it controls the deflector's operation by controlling the position until the deflector starts and completes its operation as one of the control conditions. It is most suitable for It is very convenient and has good workability without reducing the transfer speed.

[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 a diagram of a defective sheet with a length shorter than the distance between the rotary cutter and the deflector, and Figure 4 is a diagram showing the length of the defective sheet being longer than the distance between the rotary cutter and the deflector. FIG. 6 is an explanatory diagram of an operation when discharging a defective sheet. 11-24...Defect detector 25...Defect removal control device 26...Deflector 29.30...Push button patent applicant Isowa Iron Works Co., Ltd. Third factor distance foot deviation procedure amendment (voluntary ) November 14, 1985 (To the Patent Office Examiner) 1. Indication of the case Patent Application No. 118468/1988 2. Title of the invention
How to remove defective sheets 3, relationship with the case of the person making the amendment Applicant Address Name Isowa Iron Works Co., Ltd. (foreign name)
4. Agent address: 2-1-1 Higashikanda, Chiyoda-ku, Tokyo 101
No. 1 5゜ own issue Showa year
Month/Date 6゜Object of amendment 7, Contents of amendment (1) In grasping the detailed explanation of the invention in the specification, (a)
"Shredded" on page 3, line 17, page 4, line 2 of the specification is amended to "cut J." (b) Page 4, line 19, page 5, line 1, On page 5, lines 3 and 4, "shredded sheet" should be corrected to "cut sheet."that's all

Claims (1)

[Claims] A defective spot is detected from a continuous sheet being transferred, the position of the defective spot is constantly tracked as the sheet is transferred, and after the sheet is cut with a cutter, the starting end of the cut sheet having the defective spot is a deflector. The defective sheet is characterized in that when the deflector reaches a position in front of it corresponding to the operating time of the defective sheet, the deflector performs an ejection opening operation, and when the rear end of the cut sheet having a defective portion is located, the deflector performs a return operation. How to remove.