JP2018083699A - Sheet abnormality detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress decrease in yield by preventing the conveyance of a sheet which is likely to be abnormal due to a separation failure at an early stage.SOLUTION: A sheet abnormality detection device 10 of the present invention is applied to a sheet feeding portion F of a sheet processing machine comprising a separator 1 having a suction port 2 for sucking and pulling up a sheet and a blowing foot 4 that enters into a gap formed between the sheet sucked by the suction port 2 and a sheet beneath that sheet and blows out air. The abnormality detection device 10 comprises an abnormal sound detecting unit 11 for detecting a sound of the air blown out by the blowing foot 4, and an arithmetic processing unit 12 for determining whether or not a sheet separation failure has been caused by the suction port 2 according to a detection result from the abnormal sound detector 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an abnormality detection apparatus for a sheet in a sheet feeding unit of a sheet processing machine such as a sheet printing machine.

  A sheet feeding unit such as a sheet-fed printing machine or a sheet punching machine separates and conveys the sheets stacked on the main pile (paper stacking board) in order from the top. A mechanism called a separator is generally used for separating and transporting paper in such a paper feeding unit.

  FIG. 7 shows a schematic view of a general separator 1, and the separator 1 in the figure includes a first mouthpiece portion 2, a second mouthpiece portion 3, and a blowing foot 4. The first suction port 2 and the second suction port 3 are arranged above the sheet group P stacked on a main pile (not shown), and the first suction port 2 is more feeder than the second suction port 3. Located away from a board (not shown). Moreover, the 1st suction port part 2 can move to an up-down direction, and the 2nd suction port part 3 can move to the up-down direction and a horizontal direction. On the other hand, the blowing foot 4 is disposed above a region of the upper surface of the paper group P opposite to the feeder board side, and as shown by an arrow in the figure, the blowing foot 4 is in contact with a contact position where the paper group P is pressed from above. It can be swung between a separated position obliquely above the contact position.

  FIGS. 8A to 8D are diagrams for explaining the operation of the separator 1. When the separator 1 conveys the paper, first, as shown in FIG. 8A, the paper P1 is sucked by the first suction port 2 lowered toward the uppermost paper P1 in the paper group P. The sheet P1 and the lower sheet P2 are partially separated by sucking and raising the first suction port 2 to the upper initial position. Next, as shown in FIG. 8B, the separator 1 causes the blowing foot 4 to enter the gap between the paper P <b> 1 and the lower paper P <b> 2 generated by the rising of the first suction port 2, and the blowing foot 4. Is moved to the contact position. As a result, the blowing foot 4 blows air toward the feeder board side of the gap while pressing the paper P2 from above, and the paper P1 and the paper P2 are completely separated. Next, as shown in FIG. 8C, the separator 1 adsorbs the paper P1 by suction of the second suction port portion 3 lowered toward the paper P1, and then raises the second suction port portion 3. The separation state of the paper P1 is maintained. Thereafter, as shown in FIG. 8 (d), the separator 1 releases the suction by the first suction port portion 2, moves the second suction port portion 3 to the feeder board side, and then moves the second suction port at a predetermined position. The suction by the mouth 3 is stopped and the paper P1 is supplied onto the feeder board. At this time, the blowing foot 4 is moved to the separation position. By repeating the above operation, the sheets in the sheet group P are sequentially conveyed to the feeder board.

  By the way, as a problem in the separation and conveyance of the sheet by the separator 1 as described above, there is a separation failure caused by the stepping of the uppermost sheet P1 by the blowing foot 4 as shown in FIG. This failure is caused by a mistake in suction of the paper at the first mouthpiece 2 or the moving foot 4 coming into contact with the paper sucked by the first mouthpiece 2 so that the paper is forced from the first mouthpiece 2. It can be caused by being separated and pressed from above. In this case, the orientation of the paper may be collapsed and conveyed, or the paper may be folded, broken, torn or the like due to contact, resulting in product defects.

  Various techniques have been proposed in the past for improving the conveyance failure of a sheet in a sheet processing machine. For example, Patent Document 1 discloses a technique in which a fraudulent paper detector provided on the feeder board side detects paper bending or deviation and stops paper conveyance in response to detection of an abnormality. Japanese Patent Application Laid-Open No. 2004-228688 discloses a technique for detecting the thickness of a sheet being conveyed by a sheet feeding unit using a roller group in order to detect an illegal sheet in which a torn or the like has occurred, and determining whether the sheet is illegal based on the detection result. It is disclosed. Also, cited document 3 discloses a technique for inspecting an abnormality that has occurred in a printed material by capturing the image information of the printed material for each pixel and comparing a signal based on the image information for each pixel with a reference signal for each corresponding pixel. Yes.

Japanese Patent Laid-Open No. 4-347461 JP 2008-260633 A Patent No. 1632112

  However, the technique disclosed in Patent Document 1 cannot detect the folding, crease, and tearing of the paper due to the contact of the blowing feet by the illegal paper detector, and the defective paper in which these defects occur is sent downstream on the feeder board side. End up. In addition, when an illegal paper is detected by the illegal paper detector on the feeder board side, the illegal paper can be removed on the feeder board. However, if there is an illegal paper, generally the subsequent paper is also illegal. Treated as paper and removed. For this reason, the detection timing by the illegal paper detector is late, and many subsequent papers become illegal papers, which may increase the yield.

  Further, in the technique disclosed in Patent Document 2, tears that are not accompanied by folding or peeling of the sheet, and creases cannot be detected by the detection roller group, and thus, the faulty paper having these defects is conveyed downstream. In addition, since the roller group uses the paper being conveyed as a detection target, the detection timing is late as described above, and there is a possibility that the yield decreases as described above.

  In addition, the technology of Patent Document 3 can detect abnormalities such as paper breaks, tears, creases, etc., in addition to a decrease in the density of printed matter, water dripping, and ink dripping. There is a possibility that a large number of papers become illegal papers, resulting in a large decrease in yield as described above.

  The present invention has been made in consideration of the above circumstances, and is a sheet that can effectively prevent a decrease in yield by preventing the conveyance of paper that may be abnormal due to poor separation at an early stage. An object of the present invention is to provide an abnormality detection apparatus.

  The present invention has a mouthpiece portion that sucks and pulls up a sheet, and a blowing leg that enters a gap formed between the sheet adsorbed on the mouthpiece portion and a sheet below it and blows out air. An abnormality detection apparatus for a sheet in a sheet feeding unit of a sheet processing machine having a separator, wherein the noise detection unit detects the sound of air blown out by the blowing feet, and the detection result of the noise detection unit And an arithmetic processing unit that determines a separation failure of the sheet by the suction port according to the sheet abnormality detecting device.

  According to the present invention, it is possible to determine the separation failure caused by the stepping on the paper of the blowing foot, which may be generated when the blowing foot contacts the paper adsorbed to the mouthpiece portion, according to the sound detected by the abnormal sound detection unit, By stopping the operation of the separator when the determination is made, it is possible to prevent the sheet with poor separation from being conveyed downstream. Thereby, it is possible to prevent a sheet having a possibility of abnormality due to a separation failure from being conveyed at an early stage, and to effectively suppress a decrease in yield.

  It is preferable that the arithmetic processing unit stops the operation of the separator when it is determined that the paper is not properly separated by the mouthpiece.

  In this configuration, when the separation failure is determined, the operation of the separator is surely stopped, so that it is possible to reliably prevent the poorly separated paper sheet from being conveyed downstream.

  The arithmetic processing unit may determine that a paper separation failure has occurred due to the mouthpiece when the frequency of the sound detected by the abnormal sound detection unit exceeds a threshold value.

  In this configuration, the separation failure can be easily determined when the sound of air at the time of occurrence of the separation failure due to the stepping on the paper of the blowing foot is higher than the normal case.

  In addition, the arithmetic processing unit may determine that a paper separation failure has occurred due to the mouthpiece when the frequency of the sound detected by the abnormal sound detection unit falls below a threshold value.

  In this configuration, the separation failure can be easily determined when the sound of air when the separation failure occurs due to the stepping on the paper of the blowing foot is lower than the normal sound.

  In addition, the arithmetic processing unit may operate the abnormal sound detection unit immediately before the air is blown out by the blowing foot or during a predetermined period measured from the start of the blowing.

  In this configuration, the abnormal sound detection unit is not operated at a timing at which sound detection is unnecessary, so that erroneous sound detection can be suppressed and the detection accuracy of separation failure can be improved.

  In addition, the separator further includes a holding mouth portion that sucks the paper at a predetermined timing during the blowing of air by the blowing feet, and the arithmetic processing unit starts the sucking operation of the holding mouth portion. At this time, the operation of the abnormal sound detection unit may be stopped.

  In this configuration, it is possible to improve the detection accuracy of the separation failure by stopping the abnormal sound detection unit before the holding mouthpiece adsorbs the sheet to cause a change in the sound of the air.

  According to the present invention, it is possible to prevent paper from being conveyed at an early stage, which may be abnormal due to poor separation, and to effectively suppress a decrease in yield.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematically the sheet | seat abnormality detection apparatus concerning the 1st Embodiment of this invention, and the paper feed part of the sheet processing machine to which this is applied. It is the schematic explaining the abnormality detection operation | movement of the sheet | seat abnormality detection apparatus concerning 1st Embodiment. It is the schematic explaining the abnormality detection operation | movement of the sheet | seat abnormality detection apparatus concerning 1st Embodiment. It is a flowchart explaining the abnormality detection operation | movement of the abnormality detection apparatus of the sheet concerning 1st Embodiment. It is a figure which shows schematically the abnormality detection apparatus of the sheet paper concerning the 2nd Embodiment of this invention. It is a flowchart explaining the abnormality detection operation | movement of the abnormality detection apparatus of the sheet material concerning 2nd Embodiment. It is the schematic of the common separator in the paper feed part of a sheet processing machine. (A)-(d) is a figure explaining operation | movement of a general separator. It is a figure explaining the separation defect of the paper which may arise with a general separator.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the thing similar to the component in the general separator etc. which were demonstrated using FIG. 7 thru | or FIG. 9 in the component of embodiment demonstrated below.

  FIG. 1 schematically shows a sheet abnormality detecting apparatus 10 according to a first embodiment of the present invention and a sheet feeding unit F of a sheet processing machine to which the sheet abnormality detecting apparatus 10 is applied. The paper feed unit F includes a main pile (not shown) that stacks and holds the paper groups P, a separator 1 disposed above the paper group P on the main pile, and a feeder board (not shown) that transports the paper separated by the separator 1. Etc. The sheet processing machine is, for example, an offset sheet-fed printing machine, a letterpress sheet-fed printing machine, a screen sheet-fed printing machine, a gravure sheet-fed printing machine, a sheet-fed folding machine, a foil stamping sheet-fed machine, an embossed sheet-fed machine, or the like. However, the type of the sheet processing machine to which the abnormality detection apparatus 10 is applied is not particularly limited.

  Although the separator 1 overlaps with the content described in FIG. 7, the separator 1 includes a first suction mouth portion 2, a second suction mouth portion 3, and a blowing foot 4. The first suction port 2 and the second suction port 3 are arranged above the sheet group P stacked on the main pile, and the first suction port 2 is more from the feeder board than the second suction port 3. Are located apart. The first mouthpiece 2 is movable in the vertical direction, and the second mouthpiece 3 is movable in the vertical and horizontal directions. Further, the blowing foot 4 is disposed above a region of the upper surface of the paper group P opposite to the feeder board side, and as shown by an arrow in the drawing, a contact position (position shown in the figure) that presses the paper group P from above. ) And a separated position obliquely above the contact position.

  The first sucking portion 2 is configured to first attract and lift the paper when separating the paper, and the blowing foot 4 is configured so that when the first sucking portion 2 lifts the paper, The air enters the gap formed between the sheet adsorbed by the single suction port 2 and the sheet below it, and blows out air. In addition, the second suction port 3 corresponds to a holding suction port at which the first suction port 2 sucks the sheet being sucked at a predetermined timing while the air is blown out by the blowing feet 4. The operation of the separator 1 is the same as the operation described with reference to FIGS. 8A to 8D, and detailed description thereof is omitted.

  As shown in FIG. 1, the abnormality detection device 10 includes an abnormal sound detection unit 11 that detects the sound of the air blown by the blowing foot 4, and the first mouthpiece unit 2 according to the detection result of the abnormal sound detection unit 11. And an arithmetic processing unit 12 for determining a paper separation failure. The abnormal sound detection unit 11 is disposed in the vicinity of the separator 1, and is particularly disposed in the vicinity of the blowing foot 4 serving as a contact position. The abnormal sound detection unit 11 is configured to collect the sound of the air blown out by the blowing foot 4, convert it into an electric signal A <b> 1, and input it to the arithmetic processing unit 12.

  In addition to the electrical signal A1 described above, the arithmetic processing unit 12 receives an input operation signal A2 for the sheet processing machine and an input feeder pump signal A3 for the paper feeding unit F, while the arithmetic processing unit 12 In response to this signal, an output operation signal A4 for the sheet processing machine (processing device portion such as a printing unit) and an output feeder pump signal A5 for the sheet feeding unit F are output. Here, the input operation signal A2 is a signal related to an operation instruction for the single wafer processing machine, and the output operation signal A4 is a signal for actually operating the single wafer processing machine. The input feeder pump signal A3 is a signal related to an operation instruction for the paper feeding unit F, and the output feeder pump signal A5 is a signal for actually operating the paper feeding unit F.

  FIG. 2 shows a normal suction state in which the blowing foot 4 enters the gap formed between the paper P1 sucked by the first suction port 2 and the paper P2 below the paper P1 and blows out air. Yes. On the other hand, FIG. 3 shows a state of poor separation in which the blowing foot 4 is stepped on the paper P1. In the state of FIG. 2 and the state of FIG. 3, the sound of the air blown out from the blowing foot 4 changes. The arithmetic processing unit 12 according to the present embodiment detects such a change in sound based on an electric signal from the abnormal sound detection unit 11 to determine a separation failure caused by the first mouthpiece unit 2. Yes.

  Specifically, in the present embodiment, the sound of air blown by the blowing feet 4 in the state of poor separation shown in FIG. 3 is higher than the sound in the normal state shown in FIG. In response to this, the arithmetic processing unit 12 determines that the separation failure of the paper P1 by the first mouthpiece unit 2 has occurred when the frequency of the sound detected by the abnormal sound detection unit 11 exceeds the threshold value. It is like that. The above-described threshold value is stored in advance in the arithmetic processing unit 12 in the present embodiment.

  In addition, the arithmetic processing unit 12 according to the present embodiment stops the operation of the separator 1 and stops the operation of the sheet processing machine when determining the separation failure of the paper P1 by the first suction port 2. It has become. In the present embodiment, the output of the output feeder pump signal A5 is turned off, the operation of the separator 1 is stopped, and the output of the output operation signal A4 is turned off. The machine is stopped.

  FIG. 4 is a flowchart for explaining an example of the abnormality detection operation of the abnormality detection apparatus 10 according to the first embodiment. Hereinafter, an operation example of the abnormality detection apparatus 10 in the present embodiment will be described.

  As shown in FIG. 4, when starting the operation of the abnormality detection device 10 according to the present embodiment, first, in step S1, the input operation signal A2 is ON (input state) and the input feeder pump signal A3 is ON ( Input state), that is, whether or not the sheet processing machine and the sheet feeding unit F are in operation. If the operating state is confirmed, the process proceeds to step S2, and if not, the process ends.

  In step S <b> 2, the abnormality detection device 10 confirms whether or not the sound from the abnormal sound detection unit 11 is outside the threshold value, specifically, exceeds the threshold value. Here, when it deviates from a threshold value, it determines with the paper separation defect by the 1st suction port part 2 having arisen, and a process transfers to step S3. On the other hand, if this is not the case, it is determined that the separation state by the first mouthpiece 2 is normal, the process returns to step S1, and the monitoring of the sound from the abnormal sound detection unit 11 is continued.

  Then, in step S3 when the separation failure is determined, the abnormality detection device 10 turns off the output feeder pump signal A5 and stops the operation of the separator 1. Thereby, the conveyance of the sheet to the feeder board side is stopped.

  According to the abnormality detection device 10 according to the present embodiment described above, the separation failure caused by the stepping of the paper of the blowing foot 4 that may be caused by the blowing foot 4 coming into contact with the paper sucked by the first suction mouth portion 2 is detected. It can be determined according to the sound detected by the abnormal sound detection unit 11, and when it is determined that the separation is poor, the operation of the separator 1 is stopped, so that it is possible to prevent the poorly separated sheet from being conveyed downstream. Accordingly, it is possible to prevent paper from being conveyed at an early stage, which may be abnormal due to poor separation, and to effectively suppress a decrease in yield.

  Next, a second embodiment of the present invention will be described. Constituent elements in the present embodiment that are the same as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  FIG. 5 is a diagram schematically showing an abnormality detection apparatus 10 according to the second embodiment. As shown in FIG. 5, in this embodiment, an input feeder timing signal A <b> 6 is input to the arithmetic processing unit 12. The input feeder timing signal A6 is a signal for controlling the operation timing of the abnormal sound detection unit 11. As a result, the arithmetic processing unit 12 operates the abnormal sound detection unit 11 immediately before the air is blown out by the blowing foot 4 or in a predetermined period counted from the start of the blowing (in this example, the start of the blowing). More specifically, the arithmetic processing unit 12 operates the abnormal sound detection unit 11 from the start of air blowing by the blowing foot 4 and stops the abnormal sound detection unit 11 when the second suction port unit 3 starts the suction operation. It is like that. That is, the predetermined period is a period from the start of air blowing until the second suction port 3 starts the suction operation.

  FIG. 6 is a flowchart for explaining an example of the abnormality detection operation of the abnormality detection apparatus 10 according to the second embodiment. Hereinafter, an operation example of the abnormality detection apparatus 10 in the present embodiment will be described.

  As shown in FIG. 6, when the abnormality detection apparatus 10 according to the present embodiment starts operation, first, in step S11, the input operation signal A2 is ON (input state) and the input feeder pump signal A3 is ON ( Input state), that is, whether or not the sheet processing machine and the sheet feeding unit F are in operation. If the operating state is confirmed, the process proceeds to step S12. If not, the process ends.

  In step S12, the air blowing timing of the blowing foot 4 is monitored, and when the air blowing is confirmed, the process proceeds to step S13. In step S13, the abnormality detection device 10 operates the abnormal sound detection unit 11. Next, in step S14, whether or not the sound from the abnormal sound detection unit 11 is outside the threshold value, specifically, whether or not it exceeds the threshold value. Confirm. Here, when it deviates from the threshold value, it is determined that there is a paper separation failure caused by the first suction port 2, and the process proceeds to step S15. On the other hand, if this is not the case, it is determined that the separation state by the first mouthpiece 2 is normal, and the process proceeds to step S16.

  In step S15 when a separation failure is determined, the abnormality detection device 10 turns off the output feeder pump signal A5 and stops the operation of the separator 1. As a result, the conveyance of the sheet to the feeder board side is stopped. On the other hand, in step S16, the suction timing of the second suction port 3 is monitored, and when the suction of the second suction port 3 is confirmed, the process proceeds to step S17. In step S17, the abnormality detection device 10 stops the abnormal sound detection unit 11, and then returns to step S11. As a result, monitoring of the sound from the abnormal sound detection unit 11 is continued.

  According to the abnormality detection device 10 according to the second embodiment as described above, the arithmetic processing unit 12 causes the abnormal sound detection unit 11 to be used in a predetermined period of time measured immediately before or after the blowing of air by the blowing foot 4. Make it work. Thereby, by not operating the abnormal sound detection unit 11 at a timing at which sound detection is unnecessary, erroneous sound detection is suppressed, and detection accuracy of poor separation can be improved.

  The arithmetic processing unit 12 is configured to stop the operation of the abnormal sound detection unit 11 when the second mouthpiece unit 3 starts the suction operation. Thereby, the detection accuracy of the separation failure can be improved by stopping the abnormal sound detection unit 11 before the change in the sound of the air occurs due to the second suction port 3 adsorbing the sheet.

  Although the embodiments of the present invention have been described above, the present invention can be variously modified without being limited to the above-described embodiments. For example, in the above-described embodiment, the arithmetic processing unit 12 determines that a separation failure has occurred when the frequency of the sound detected by the abnormal sound detection unit 11 exceeds the threshold value. There is a need to change accordingly. That is, when the sound of the air blown out by the blowing foot 4 in the state of poor separation is lower than the sound in the normal state, the frequency of the sound detected by the abnormal sound detection unit 11 falls below the threshold value. In such a case, it is necessary to adopt a configuration for determining that a separation failure has occurred.

DESCRIPTION OF SYMBOLS 1 ... Separator 2 ... 1st mouth part 3 ... 2nd mouth part 4 ... Blowing foot 10 ... Abnormality detection apparatus 11 of sheet paper ... Abnormal sound detection part 12 ... Processing part F ... Paper feed part

Claims (6)

There is provided a separator having a suction port portion that sucks and lifts the paper, and a blowing foot that enters a gap formed between the paper sucked by the suction port portion and the lower paper and blows out air. An abnormality detection device for a sheet in a sheet feeding unit of a sheet processing machine,
An abnormal sound detection unit for detecting sound of air blown out by the blowing feet;
An abnormality detection apparatus for a sheet, comprising: an arithmetic processing unit that determines a paper separation failure by the mouthpiece unit according to a detection result of the abnormal sound detection unit.   The sheet abnormality detection apparatus according to claim 1, wherein the arithmetic processing unit stops the operation of the separator when it determines a paper separation failure by the mouthpiece.   2. The arithmetic processing unit, when the frequency of the sound detected by the abnormal sound detection unit exceeds a threshold value, determines that a paper separation failure has occurred due to the mouthpiece unit. Or the sheet abnormality detection device according to 2;   2. The arithmetic processing unit, when a frequency of a sound detected by the abnormal sound detection unit falls below a threshold, determines that a paper separation failure has occurred due to the mouthpiece. Or the sheet abnormality detection device according to 2;   5. The sheet according to claim 1, wherein the arithmetic processing unit operates the abnormal sound detection unit immediately before or during a predetermined period measured from the start of the blowing by the blowing foot. Abnormality detection device for leaf paper. The separator further has a holding mouthpiece for adsorbing paper at a predetermined timing during the blowing of air by the blowing feet,
6. The sheet abnormality detection apparatus according to claim 5, wherein the arithmetic processing unit stops the operation of the abnormal sound detection unit when the holding mouthpiece starts an adsorption operation. .

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