JP4278563B2 - Web meandering recognition device - Google Patents

Description

  The present invention relates to a web meandering recognition device capable of easily grasping a conveyance state of a web continuously conveyed from a roll-shaped sheet.

  Conventionally, for example, a roll-like sheet is continuously conveyed because the thickness of a printed paper roll or a resin film is different at both ends of the sheet, or the width of the sheet may change due to a temperature change in a resin film or the like. The web that was made could meander and be wound up. The web product wound in such a meandering manner may be judged as a defective printed matter even though there is no problem as a product.

  As a conventional apparatus for preventing meandering of a web, for example, there is a meandering correction apparatus shown in FIG. In the figure, an unwinding roll 1 of the vapor deposition film F is supported by a movable frame 2, and the movable frame 2 is fixed to a fixed base 3. The movable frame 2 is connected to the actuator A, and the movable frame 2 can be moved in the width direction (arrow Y) of the vapor deposition film F. The sensor S is a photoelectric type or an air flow type, detects the edge of the vapor deposition film F, detects the meander of the vapor deposition film F, and the detection signal controls the actuator A via the control device 5; The meandering direction of the vapor deposition film F is corrected by moving the movable frame 2 in the direction opposite to the meandering direction of the vapor deposition film F. However, in this meandering correction device, meandering correction is performed on the web being conveyed at a constant speed, and since the running response is poor and the meandering cannot be corrected with high accuracy, a plurality of sensors and movable frames are provided. There are some that attempt to correct the meandering state of the vapor deposition film with high accuracy over two stages. (For example, see Patent Document 1)

  On the other hand, as a method for recognizing the meandering of the web fed from the roll-shaped sheet, there is an image processing method for recognizing using a CCD camera or the like in addition to the photoelectric or air flow sensor. In meandering recognition by image processing, inspection image data and reference image data are compared to determine whether or not the level difference of the coordinate data at each pixel position is within a predetermined value, thereby determining the quality of the printed matter. . In addition, a printed pattern is used as the inspection target image, the inspection target image is photographed, an edge image is created from the image data, and a difference between the pixel data of the edge image and the reference data of the reference image is obtained. When a predetermined number or more occurs exceeding a predetermined value, it is recognized that the web is meandering. (For example, see Patent Document 2)

Japanese Patent Laid-Open No. 5-43095 (paragraph [0003], drawing FIG. 3) JP-A-5-77408 (paragraphs [0002] [0004], drawings 2 to 3)

  Conventionally, when a web fed from a roll sheet is cut and rewound by a slitter, the meandering of the web is detected and corrected by the meandering correction device as described above, but a meander that cannot be corrected by the meandering correction device occurs. In order to prevent such an uncorrectable meandering from occurring in the web, the operator monitors the web conveyance state to prevent an accident from occurring. However, although it may be possible to monitor the whole if it is a relatively small device, for example, in a web having a roll width of 1 m or more and being conveyed at a speed of about 1 m at intervals of 1 second, the operator can It is difficult to monitor the conveyance state and determine whether the web meandering is within an acceptable range. It is also difficult to recognize the meandering when the web meandering is gradually progressing. There was a serious aspect.

  Further, some web products are regarded as defective printed matter even if a slight meander that cannot be recognized visually is observed, and there is a limit to visually monitoring the meandering of the web. In addition, to the customer, it was shown that the web meandering was within the allowable range when guaranteeing the quality of the web product, and a record showing the deviation from the reference position numerically by photographing the web at regular intervals Sheets are created and web product quality assurance is provided. However, this recording sheet is not data that can grasp the meandering of the web in real time in the work process, but is a recording sheet that is output after the work is completed, and cannot be used for web meandering monitoring.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a web meandering recognition apparatus that can grasp in real time whether or not a web is meandering in a work process. Further, a web meandering recognition device capable of judging whether or not the meandering is within an allowable range and sending a signal for controlling the web conveyance state when the web meandering of this device is recognized. It is intended to provide.

The present invention achieves the above-mentioned problems, and the invention according to claim 1 is used in an apparatus for dividing a wide web into a plurality of rows in a running direction of the web with a slitter, and is provided at both end edges of the web. and image processing to shoot straight pattern, a meandering recognition device for recognizing web meandering of the web,
First and second imaging means provided in the vicinity of the slitter, each of which captures a linear pattern on both edges of the web and outputs an image signal of the linear pattern ;
First image processing for outputting each digitized variation of coordinate position of the image signal based rather with the test pattern and the reference picture pattern of the linear pattern of the opposite edges of the web from the second photographing means Means,
A computer receiving and storing each said change amount from the image processing means,
First and second D / A conversion means for converting the amount of change received by the computer into analog signals, respectively ;
First and by a respective analog signal from the second D / A converting means, it can be determined visually the meandering of both edges of the wide web and record the meandering of both edges of the web to the recording paper And the computer is provided with meandering determination means for determining the meandering state of both end edges of the web, and when the meandering determination means has the change amount equal to or greater than a predetermined value, A web meandering recognition apparatus, wherein a computer outputs a web conveyance stop signal . As the analog recorder, a two-pen type recorder is used to record the meandering of both end edges of the web.

  According to a second aspect of the present invention, there is provided the web meandering recognition apparatus according to the first aspect, wherein the computer includes an integral calculation processing means for adding interpolation data to the change amount. In this integration calculation processing means, for example, digitized change amount data is input to a computer at a predetermined interval (approximately one second interval), and the next data is input from the first data of this data. This is a means for generating and supplementing interpolation data during a period in which no data exists. The D / A conversion means is supplied with the digitized change amount and interpolation data. As the interpolation data, digital data having a value equal to the first change amount generated at a predetermined interval is generated.

The invention of claim 3 is pre Kihebi line determining means, the amount of change control for recording the meandering of the web opposite ends to the recording paper by the analog recording means only when it is determined that exceeds a predetermined value 3. The web meandering recognition apparatus according to claim 1 , wherein the computer has means .

Further, the invention of claim 4, the pre Kihebi line determining means, when the change amount is determined to have exceeded the predetermined value, before the computer outputs a conveyance stop signal of the web, the web from the computer decelerating the conveying speed of the conveying motors of the motor control circuit in the deceleration signal output Siu E blanking, after meandering correction operation of said web, said control means changing amount is determined whether or not modified a web meandering recognition apparatus according to claim 1, 2 or 3, characterized in that the computer is closed.

In the invention of claim 1, it used a wide web device cut into a plurality of rows in the running direction of the web slitters, and image processing taken the linear pattern disposed on opposite edges of said web, said A web meandering recognition device for recognizing a meandering web,
First and second imaging means provided in the vicinity of the slitter, each of which captures a linear pattern on both edges of the web and outputs an image signal of the linear pattern ;
First image processing for outputting each digitized variation of coordinate position of the image signal based rather with the test pattern and the reference picture pattern of the linear pattern of the opposite edges of the web from the second photographing means Means,
A computer receiving and storing each said change amount from the image processing means,
First and second D / A conversion means for converting the amount of change received by the computer into analog signals, respectively ;
First and by a respective analog signal from the second D / A converting means, it can be determined visually the meandering of both edges of the wide web and record the meandering of both edges of the web to the recording paper And the computer is provided with meandering determination means for determining the meandering state of both end edges of the web, and when the meandering determination means has the change amount equal to or greater than a predetermined value, since the computer is a web meandering recognition apparatus and outputting a conveyance stop signal of the web, analog recorder, so rather draw a locus corresponding to the meandering of both edges of the web to the recording paper, the operator There is an advantage that the conveyance state of the web can be known in real time. The recording paper can be used as data for quality assurance.

  According to a second aspect of the present invention, the digitized change amount is processed by the integral calculation processing means by the computer and supplied to the analog recorder via the first and second D / A conversion means. The web meandering recognition apparatus according to claim 1, wherein, for example, digitized change amount data is input to a computer at a rate of once per second. In the integral calculation processing means, the interpolation data is added so as to compensate for one second, and is supplied to the first and second D / A conversion means so that the interpolation data is added in time series for one second. As a result of the D / A conversion, there is an advantage that a smoothly changing locus is recorded on the recording paper.

Further, in the invention of claim 3, before Kihebi line determining means, the amount of change control for recording the meandering of the web opposite ends to the recording paper by the analog recording means only when it is determined that exceeds a predetermined value 3. The web meandering recognition apparatus according to claim 1 or 2, wherein said computer has means for recording on recording paper by driving a pen by an analog recorder only when the web starts meandering. By doing so, it is possible to prevent the recording paper from being consumed more than necessary, and when the two pens of the analog recorder start operating, it is easy to recognize that they have started to meander. There is an advantage that can be.

Further, in the invention of claim 4, before Kihebi line determining means, when the change amount is determined to have exceeded the predetermined value, before the computer outputs a conveyance stop signal of the web, the web from the computer decelerating the conveying speed of the conveying motors of the motor control circuit in the deceleration signal output Siu E blanking, after meandering correction operation of said web, said control means changing amount is determined whether or not modified since in web meandering recognition apparatus according to claim 1, 2 or 3, characterized in that the computer is closed, if the change amount exceeds a predetermined value, in order to decelerate the transport speed of the web, a control signal Supply to the motor rotation control circuit to reduce the number of rotations of the motor, correct the meandering of the web with the meandering correction device, determine again whether the change amount is normal with meandering determination means, and the meandering of the web gets worse Seems to If, so as to stop the transport of the web, there is an advantage that it is possible to prevent the defect due to the meandering of the web occurs.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a web meandering recognition apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating an embodiment of the present invention, in which a web W is wound around a winding shaft 6 in a roll shape, and the winding shaft 6 is rotated by a motor 22 and the winding side winding shaft is rotated. The web W is conveyed so as to synchronize the rotation, and a slit Rc is formed in the web W along a predetermined slit line by the slitter 20 provided immediately before the web W is sent to the guide roller 21, respectively. It is wound up. The web W is a material such as a printed paper roll or a resin film, and the thickness of the printed layer may be different in the width direction, or a barrier layer such as an aluminum vapor deposition film may be formed. Moreover, there are many materials that expand and contract due to temperature changes, such as a resin film, and the web W has a property of meandering when being conveyed. Such a web W processing step is usually provided with a meandering correction device to correct the meandering of the web W. In FIG. 1, illustration of the meandering correction device is omitted. Further, the meandering correction device performs the meandering correction while keeping the web conveyance speed constant, and as described above, there is a limit to the meandering correction.

  In this embodiment, the linear pictures Ra and Rb at both ends of the web W are photographed by the CCD cameras 15 and 17, respectively, and their image signals are supplied to the image processing apparatus 10, and the pictures Ra and Rb are photographed to obtain the web W. Detects meandering. The CCD cameras 15 and 17 are provided on the sliders 15a and 17a so that the CCD cameras 15 and 17 can be moved left and right by driving a motor. The CCD cameras 15 and 17 are set to optimum positions for photographing the linear patterns Ra and Rb by the sliders 15a and 17a, and are supplied from the illumination power source 19 having a dimming function to the illumination lamps 16 and 18 such as light emitting diodes. A current is supplied and turned on to illuminate the linear patterns Ra and Rb, so that photographed images with good brightness balance can be obtained from the CCD cameras 15 and 17.

  The image processing apparatus 10 includes A / D converters 10a and 10b, a storage unit 10c, a control unit 10d, and the like. Image signals from the CCD cameras 15 and 17 are digitally converted by the A / D converters 10a and 10b. It is converted into a signal and stored in the storage unit 10c. The control unit 10d outputs a timing signal capable of intermittently photographing the linear pictures Ra and Rb provided on both ends of the web W by the CCD cameras 15 and 17 and outputs an image signal from the CCD cameras 15 and 17. It is stored in the storage unit 10c, and is obtained by calculating the amount of change in the coordinate position between the reference pattern and the inspection pattern on both edges of the web W. The calculated amount of change is stored in the storage unit 10c, and the I / It is supplied to the computer 12 through F10e. The image recorded in the storage unit 10c is displayed on the image processing display 11 through the D / A converter 10g. In addition, a dimming control signal is supplied to the illumination power source 19 via the I / F 10f so that the illumination lamps 16 and 18 have an optimum illuminance.

  The computer 12 includes a central processing unit (CPU), a storage unit 12a, and the like, and is connected to an analog recorder 13 and a display 14, and an input device such as a keyboard (not shown). The central processing unit (CPU) is provided with integral calculation processing means 12b based on a control program. The amount of change (digital signal) obtained from the image processing apparatus 10 is integrated by the integration calculation processing means 12b, and the analog recorder 13 is driven through the D / A converters 12c and 12d, and the meandering of the web W is applied to the recording paper 13a. It is recorded. As the recording paper 13 is fed out at a constant speed and the both end edges of the web W meander, the pens of the two-pen type analog recorder 13 operate, and the meandering state of the both end edges of the web W is the recording paper. 13 is recorded as a trajectory.

  The integral calculation processing means 12b has a function of compensating for a period in which no data is received with interpolation data, for example, when digitized change amount data is input at a predetermined interval (about 1 second). The interpolation data is a digital signal having a value equal to the initial change amount. That is, the digitized change amount data is input to the computer at a rate of once per second, and the integral calculation processing means 12b converts the interpolation data so as to compensate for the absence of data between the change amount data. The change amount and the interpolation data are supplied to the D / A converters 12c and 12d in time series. By adding the interpolation data, the meandering locus of the web W is smoothly recorded on the recording paper 13a.

  Of course, the digitized change amount may be supplied to the analog recorder 13 through the D / A converters 12c and 12d without being processed by the integral arithmetic processing means 12b. In that case, the meandering state of the web W can be relatively easily grasped by lowering the feeding speed of the recording paper 13 a of the analog recorder 13. However, by adding the interpolation data by the integral calculation processing means 12b, the analog recorder 13 displays a smooth curve corresponding to the meandering of the web W on the recording paper 13a, and the operator recognizes the meandering of the web W more. Easy to do.

  Further, the computer 12 includes meandering determination means for determining whether or not the amount of change is within a predetermined range. When it is determined that the meandering has exceeded a predetermined value, the computer 12 determines that the meandering is abnormal, A control signal for stopping the conveyance is output and a meandering abnormality is recorded. Further, in the present embodiment, when the meandering determination unit corrects meandering of one end edge of the web W by the meandering correction device, it detects that the correction side meanders more than a predetermined value and stops the conveyance of the web W. Alternatively, various controls such as detecting that the both end edges of the web W meander and immediately stopping the conveyance of the web W are possible.

Next, how to determine the amount of change in this embodiment will be described with reference to FIG. In the figure, a reference image R and an inspection target image A of a linear pattern Ra or a linear pattern Rb are shown, and the reference image R shows an image area (window) of 40 mm ² , for example, the linear pattern Ra is Photographed at a position of 20 mm. As described above, the CCD cameras 16 and 17 are set so that the linear patterns Ra and Rb are photographed substantially in the center, and the linear patterns Ra and Rb of the web W being conveyed are taken every predetermined time (about 1 second interval). ) At several locations, and an average image of each image is selected and stored as a reference image R. In the reference image R shown in the figure, for example, the linear pattern Ra is at a position of 20 mm, and the coordinate of this center position is g (X, 0). The coordinate value in the Y-axis direction is 0. On the other hand, the captured linear pattern Ra is displayed in the window of the inspection target image A, and the coordinate of the center position of the linear pattern Ra is g (X + ΔX, 0). Therefore, when the coordinate g (X + ΔX, 0) of the inspection target image A is compared with the coordinate g (X, 0) of the reference position, the change amount in the X-axis direction is Δx, and the change amount Δx is a change caused by meandering of the web W. Amount.

  Next, a schematic control flow for calculating the amount of change by the image processing apparatus 10 in the present embodiment will be described with reference to FIG. In step S1, several places are photographed, and the pixels (pixels) and g (X, 0) of the position coordinates near the average value serving as the reference image are stored as a reference. In step S2, measurement of the conveyed web W is started, and the pixel g (X ′, 0) of the position coordinate of each measurement point is read. In step S3, the deviation in the X-axis direction is determined as X−X ′ = ΔX. It is calculated by the following equation. ΔX is the number of dots. In step S <b> 3, the change amount ΔX is sent to the computer 12.

  Further, the computer 12 has a function of controlling the conveyance of the web W based on the change amount ΔX. An example of the processing flow will be described with reference to FIG. In step S1 in the figure, the change amount ΔX of each measurement position input from the image processing apparatus 10 is stored in the storage area. Subsequently, in step S2, ΔX · A (where A is a dimension (mm) per dot) indicating how much the linear pattern measured from the change amount ΔX is shifted from the reference position. To convert the dots into millimeters and store them in the storage area. In the storage area, ΔX and ΔX · A are stored in time series.

  Subsequently, in step S3, it is determined by meandering determination means (ΔX> Xr) whether or not the change amount ΔX exceeds a predetermined value Xr. Xr is Xr <Xmax, and Xmax is an allowable maximum change amount. If the predetermined value Xr is exceeded in step S3, the process proceeds to step S4, where the traveling speed (conveying speed) of the web W is gradually reduced to increase the effect of the meander correction on the unit conveying distance of the web W. Moreover, if it is NO in step S3, it will progress to step S7 and will maintain the conveyance speed of the web W. Proceeding from step S4 to step S5, it is determined by the meandering determination means (ΔX <Xr) whether or not the variation ΔX is stable. If NO, the conveyance of the web W is stopped, and if YES, the process proceeds to step S7. . Of course, if ΔX> Xmax in step S3, the process immediately proceeds to step S6, and the computer 12 outputs a deceleration signal to the motor control circuit 23 to stop the rotation of the motor 23 and stops the conveyance of the web W.

  In this way, when the meandering determination means of the computer 12 is controlled as described above, when it is determined that the change amount ΔX exceeds the predetermined value Xr, the motor 12 outputs a motor deceleration signal, and the web W meanders. After performing the correction operation, it is determined whether or not the amount of change has been corrected. If it is determined that the meandering state has deteriorated, the computer 12 outputs a web W conveyance stop signal. By reducing the web W conveyance speed and operating the meander correction device to correct the meander, the efficiency of the meander correction operation is further improved than when the meander correction operation is performed while the web W is being conveyed at a high speed. Is done.

  The meandering determination means of the computer 12 operates the pen of the analog recorder 13 by operating the pen of the analog recorder 13 when it is determined that the change amount ΔX exceeds the predetermined value Xr, that is, when the web W recognizes the meandering. It is also possible to control to record the state, and the operator can recognize that the web W has meandered when the pen of the analog recorder 13 is activated. At that time, the time from the processing start time of the web W may be measured, and the meandering time may be recorded on the recording paper. Furthermore, when the meandering of the web W is recognized, the meandering determination means sends a deceleration signal to the motor control circuit as described above, and performs the meandering correction operation of the web W after the conveyance speed of the web W is attenuated. Then, it is determined again whether the meandering of the web W has deteriorated from the amount of change ΔX. If it is determined that the web W has deteriorated, a conveyance stop signal for stopping the conveyance of the web W is output to convey the web W To stop. In addition, although it is the same also in the said embodiment, when it determines with the meandering of the web W having been improved, after maintaining the low speed conveyance of the web W, it can control to return to the predetermined conveyance speed. it can.

  Further, in the present embodiment, when a meandering correction device is provided so as to detect meandering at both ends of the web W and to correct and control meandering of one end of the web W, the end performing correction of the web W When meandering is detected on the edge side, the web W may be controlled to stop unconditionally. Further, when meandering exceeding a predetermined level is detected at both end edges of the web W, the web W may be controlled to stop unconditionally. These controls can be variously controlled by the computer 12 according to the meandering characteristics of the web.

  The present invention is effective for the meandering recognition when a slit is formed in the web to cut the web, but such meandering recognition is effective when various processes are applied to the web in addition to forming the slit. .

It is the figure which showed one Embodiment of the meandering recognition apparatus of the web in this invention, and added the block diagram of the control system to the schematic which shows conveyance of a web. It is explanatory drawing which shows an example at the time of performing meandering recognition in this embodiment by image processing. It is a figure which shows the processing flow of the meandering recognition in this embodiment. It is a figure which shows the processing flow of the web conveyance control in the meandering recognition of this embodiment. It is a perspective view which shows the meandering correction apparatus of the conventional web.

Explanation of symbols

6 Web winding shaft 10 Image processing device 10a, 10b A / D converter 10c Storage unit 11 Display for image processing device 12 Computer 12a Storage unit 12b Integral operation processing means 12c, 12d D / A converter 13 Analog recorder 14 display 15, 16 CCD cameras 15a, 16a slider 17, 18 light emitting diode 19 for illumination source 20 slitter <br/> 21 guide rollers 22 motor 23 motor control circuit Ra, Rb linear pattern Rc slit W web

Claims (4)

The wide web slitter used in the apparatus cut into a plurality of rows in the running direction of the web, and shoot straight picture provided opposite edges of the web to image processing, recognizing the meandering of the web web The meandering recognition device of
First and second imaging means provided in the vicinity of the slitter, each of which captures a linear pattern on both edges of the web and outputs an image signal of the linear pattern ;
First image processing for outputting each digitized variation of coordinate position of the image signal based rather with the test pattern and the reference picture pattern of the linear pattern of the opposite edges of the web from the second photographing means Means,
A computer receiving and storing each said change amount from the image processing means,
First and second D / A conversion means for converting the amount of change received by the computer into analog signals, respectively ;
First and by a respective analog signal from the second D / A converting means, it can be determined visually the meandering of both edges of the wide web and record the meandering of both edges of the web to the recording paper And the computer is provided with meandering determination means for determining the meandering state of both end edges of the web, and when the meandering determination means has the change amount equal to or greater than a predetermined value, A web meandering recognition apparatus, wherein a computer outputs a web conveyance stop signal . The web meandering recognition apparatus according to claim 1, wherein the computer includes an integral calculation processing unit that adds interpolation data to the change amount. Before Kihebi line determination means, characterized in that said computer control means for recording the meandering of the web opposite edges on the recording paper has by the analog recording means only when the change amount is determined to have exceeded the predetermined value The web meandering recognition apparatus according to claim 1 or 2. Before Kihebi line determining means, when the change amount is determined to have exceeded the predetermined value, before the computer outputs a conveyance stop signal of the web, the deceleration to the motor control circuit of a motor for transporting the web from the computer decelerating the conveying speed of the signal output Siu E blanking, after meandering correction operation of said web, a control means for changing amount is determined whether the corrected said computer characterized by chromatic The web meandering recognition apparatus according to claim 1, 2 or 3.

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