JP2015155162A - Device and method for detecting printing failure on web, and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve printing quality by detecting printing failure and to reduce a printing cost by reducing spoilage in a device and a method for detecting printing failure on a web and a printer.

SOLUTION: There are provided a printing device U capable of performing solid printing on a web W, a first detection sensor 102 for detecting a white paper part B in the web W after the solid printing, and a control device 103 for determining whether a position of the white paper part B formed in the web W is at a specified position preset beforehand on the basis of the detection result of the first detection sensor 102.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a web printing defect detection apparatus and method for detecting a cutting position when a printed web is cut and overlapped and then folded to form a fold, and to a printing press.

  For example, a newspaper rotary offset printing press includes a paper feeding device having a plurality of paper feeding units, a printing machine having a plurality of printing units, a web pass device, and a folding machine. When each paper feeding unit supplies a web to the corresponding printing unit, each printing unit performs printing on each web. The web pass device cuts the printed webs, then vertically cuts them, and superimposes them in a predetermined order. The folding machine vertically folds a plurality of stacked webs, then horizontally cuts the web by a predetermined length, forms a fold by horizontally folding, and discharges the paper.

  In this way, the web fed from the paper feeding unit in the newspaper offset rotary printing press is printed by the printing unit, passes through a predetermined conveyance path, and the path length is adjusted by the web path device (compensator). After that, it is sent to the folding machine.

  An example of such a printing machine is described in the following patent document.

Japanese Patent Laid-Open No. 02-286244 JP 2009-045750 A JP 2008-094021 A

  By the way, in an offset rotary printing press for newspapers, for example, before starting printing, it is necessary to guide the leading end of a web (roll paper) supported by the paper feeding device from the paper feeding device to the folding machine. At this time, if the paper passing path is wrong, the images of the webs will be shifted when a plurality of printed webs are superimposed. In addition, the compensator of the web pass device adjusts the path length, but if there is an input mistake in the set value, the images on each web will be misaligned when a plurality of printed webs are overlapped. End up. In Patent Document 3, cutting registration is performed using the black loss gap. In this case, however, adjustment for reducing the amount of dampening water is required, and workability is reduced.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and a web printing defect detection apparatus and method for reducing printing costs by detecting printing defects and improving printing quality and reducing printing costs, and a printing press The purpose is to provide.

  In order to achieve the above object, a web printing defect detection apparatus according to the present invention includes a printing machine capable of performing solid printing on a web, and the amount of reflected light between a blank paper portion and a solid printing portion with respect to a determination item for printing failure. A determination data storage unit in which a threshold value is stored; a detection sensor for detecting a reflected light amount value of the solid web; a reflected light amount value detected by the detection sensor; and a reflected light amount stored in the determination data storage unit And a display device for displaying a determination result of the determination device.

  Therefore, since the determination device compares and determines the reflected light amount value detected by the detection sensor and the threshold value of the reflected light amount stored in the determination data storage unit, a printing failure is determined according to the position of the blank paper portion formed on the web. judge. Therefore, it is possible to improve printing quality by detecting printing defects, and to reduce printing cost by reducing waste paper.

  In the web printing defect detection device of the present invention, the determination device compares the reflected light amount value detected by the detection sensor with the threshold value of the reflected light amount stored in the determination data storage unit, thereby determining the web. It is characterized in that it is determined that the position of the formed white paper portion is at a preset specified position.

  Therefore, since the determination device determines that the position of the blank paper portion formed on the web is at the specified position, when the position of the blank paper portion formed on the web is not at the specified position, the overlapping of the plurality of webs is performed. It can be determined that it is defective.

  In the web printing defect detection device of the present invention, the printing machine includes an ink supply device, a plate cylinder, and a blanket cylinder, and the blank paper portion is formed by a blanket mounting gap in the blanket cylinder. Yes.

  Therefore, by forming the blank paper portion by the blanket mounting gap in the blanket cylinder, it is possible to improve workability without requiring a special printing operation.

  In the web printing defect detection device of the present invention, the printing machine includes a plurality of printing units, a web pass device, and a folding machine, and the detection sensor is between the web pass device and the folding machine. The first detection sensor is arranged to face the web before the plurality of webs are overlaid.

  Therefore, the 1st detection sensor can detect the position of this blank paper part appropriately by detecting a blank paper part to the web before a plurality of webs are piled up.

  In the web print defect detection device of the present invention, the determination device displays a cutting registration failure by the display device when the position of the blank portion detected by the first detection sensor is shifted from the specified position. It is characterized by.

  Therefore, for example, by disposing the first detection sensor at a predetermined distance from the cross-cutting position of the folding machine, when the blank paper portion passing through this position is deviated from the specified position, the web is properly conveyed. The misalignment can be detected as a cutting registration failure, and the display device can display the cutting registration failure, so that the operator can be accurately notified of the web overlay failure.

  In the web printing defect detection apparatus of the present invention, the solid printing is performed by operating the printing machine at a slow speed.

  Therefore, the printing press performs solid printing when operating at a slow moving speed and performs defect detection, thereby reducing waste paper and reducing printing costs.

  In the web printing defect detection device of the present invention, the determination device compares the reflected light amount value detected by the detection sensor with the reflected light amount threshold value stored in the determination data storage unit, thereby determining the solid printing. When the blank paper portion is detected in the portion, it is determined that the blanket is defective.

  Therefore, if there is a dent such as a scratch on the blanket, the ink is not transferred properly. Therefore, if there is a blank paper portion in the solid printing portion, the determination device determines that the blanket is defective. Therefore, it is possible to improve the printing quality and reduce the printing cost by reducing the waste paper.

  In the web printing defect detection device according to the present invention, the printing press is capable of multicolor printing, and the detection sensor detects the blank paper portion in the solid printing portion of the web that has been printed in a single color. It is characterized by having.

  Accordingly, since the second detection sensor detects the blank paper portion in the solid printing portion for each web that has been printed in a single color, it is possible to detect a blanket cylinder defect for each color.

  In the web printing defect detection device of the present invention, the determination device compares the reflected light amount value detected by the detection sensor with the threshold value of the reflected light amount stored in the determination data storage unit, thereby determining the web. It is characterized in that it is determined that the length of the printed portion to which the ink has been transferred is within a preset specified length.

  Therefore, since the determination device determines that the length of the printed portion on which the ink has been transferred to the web is within the specified length, when the length of the printed portion formed on the web is not within the specified length, It is determined that the pressure is defective. For this reason, it is possible to improve the printing quality by detecting a printing pressure defect among the ink application roll, the plate cylinder, and the blanket cylinder, and it is possible to reduce printing paper and reduce printing cost.

  In the web printing defect detection apparatus according to the present invention, the printing press includes an ink application roll, a plate cylinder, and a blanket cylinder, and the detection sensor contacts the ink application roll and the plate cylinder in a stopped state. And a third detection sensor for detecting the ink transferred to the web through the blanket cylinder.

  Therefore, since the determination device determines that the length of the printed portion on which the ink has been transferred to the web is within the specified length, when the length of the printed portion formed on the web is not within the specified length, It is determined that the pressure is defective. Therefore, it is possible to improve the printing quality by detecting a printing pressure defect between the ink application roll and the plate cylinder.

  In the web printing defect detection apparatus according to the present invention, the printing press includes an ink application roll, a plate cylinder, and a blanket cylinder, and the detection sensor makes contact with the plate cylinder and the blanket cylinder in a stopped state. And a third detection sensor for detecting the ink transferred to the web.

  Therefore, since the determination device determines that the length of the printed portion on which the ink has been transferred to the web is within the specified length, when the length of the printed portion formed on the web is not within the specified length, It is determined that the pressure is defective. Therefore, the printing quality can be improved by detecting a printing pressure defect between the plate cylinder and the blanket cylinder.

  The web printing defect detection method according to the present invention includes a step of performing solid printing on a web, a step of detecting a reflected light amount value of the solid web, and the detected reflected light amount value set in advance. The method includes a step of comparing and determining a threshold value of the amount of reflected light and a step of displaying the determination result.

  Therefore, by comparing and determining the detected reflected light amount value and a preset reflected light amount threshold value, it is possible to detect printing defects and improve the printing quality, and to reduce printing paper and reduce printing costs. Reduction can be achieved.

  Further, the printing machine of the present invention includes an ink supply device that supplies ink, a plate cylinder to which ink is supplied from the ink supply device, a blanket cylinder that is in contact with the plate cylinder, and a web printing defect detection device; , Characterized by having.

  Therefore, by comparing and determining the detected reflected light amount value and a preset reflected light amount threshold value, it is possible to detect printing defects and improve the printing quality, and to reduce printing paper and reduce printing costs. Reduction can be achieved.

  According to the web printing defect detection apparatus and method and the printing machine of the present invention, the detected reflected light amount value of the solid printed web is compared with the threshold value of the preset reflected light amount. As a result, the print quality can be improved and the printing cost can be reduced by reducing the waste paper.

FIG. 1 is a schematic configuration diagram illustrating a web printing defect detection apparatus according to the present embodiment. FIG. 2 is an explanatory diagram for explaining a web printing defect detection method. FIG. 3 is a schematic diagram showing the printing preparation of the printing press. FIG. 4 is a schematic configuration diagram illustrating a blanket defect detection device. FIG. 5 is an explanatory diagram for explaining a printing pressure defect detection method of the printing press. FIG. 6 is an explanatory diagram for explaining a printing pressure defect detection method of the printing press. FIG. 7 is a schematic configuration diagram illustrating a newspaper offset rotary printing press. FIG. 8 is a schematic configuration diagram showing a printing unit in a newspaper offset rotary printing press.

  Exemplary embodiments of a web printing defect detection apparatus and method and a printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  FIG. 7 is a schematic configuration diagram illustrating a newspaper offset rotary printing press, and FIG. 8 is a schematic configuration diagram illustrating a printing unit in the newspaper offset rotary printing press.

  As shown in FIG. 7, the printing press of this embodiment is an offset rotary printing press for newspapers, and includes a paper feeding device R, an infeed device I, a printing device U, a web pass device D, and a folding machine. F. The paper feeding device R has a plurality (seven in the first embodiment) of paper feeding units R1 to R7, and the infeed device I has a plurality (seven in the first embodiment) of infeed units I1 to I7. The printing apparatus U has a plurality (six in the first embodiment) of printing units U1 to U6, and the web pass apparatus D has a plurality of (two in the first embodiment) web pass units D1. , D2 and the folding machine F has a plurality of (two in the first embodiment) folding units F1, F2.

  In this case, the printing units U1 to U6 are described as six units. However, each of the printing units U1 to U6 can perform four-color printing, and can be divided vertically into twelve two-color printing units U11 and U12. , U21... U61, U62. In addition, although the two folding units F1 and F2 are described above and below, actually, there are an operation side folding unit F1 and a driving side folding unit F2 that are arranged side by side in a direction orthogonal to the paper surface. Furthermore, although the printing apparatus U has been described from two parts, it has been described by dividing it into two in terms of function, and in reality, it is a single apparatus.

  In this newspaper offset rotary printing press, paper feed units R1 to R7 are installed on the first floor of a building (not shown), infeed units I1 to I7 are installed on the second floor, and the second and third floors. The printing units U1 to U6 are installed, the web pass device D is installed from the third floor to the fifth floor, and the folding machine F is installed on the second and third floors.

  In the paper feeding device R, the paper feeding units R1 to R7 have substantially the same configuration, and have a holding arm 11 that holds three webs on which a web (printing medium) W is wound in a roll shape. By rotating 11, the web can be rotated to the paper feeding position. Each of the paper feeding units R1 to R7 is provided with a paper splicing device (not shown), and when the remaining web fed out at the paper feeding position becomes small, the paper splicing device causes the paper web at the paper feeding position to be fed. Thus, the web at the standby position can be spliced.

  In the infeed apparatus I, the infeed units I1 to I7 have substantially the same configuration, and the web traveling through the printing apparatus U is adjusted by adjusting the tension of the web W fed to the printing units U1 to U6 of the printing apparatus U. The tension of W is stably maintained at an appropriate value. For example, each of the infeed units I1 to I7 includes an infeed roller, a paper pressing rubber roller, a dancer roller, a guide roller, and the like. Then, the tension of the web W is applied by applying a force to the tension direction of the dancer roller, and the peripheral speed of the infeed roller is changed according to the swing of the dancer roller to maintain the proper tension of the web W. ing.

  Note that the tension of the web W from the paper feeding device R to the infeed device I is performed by a brake device (not shown) provided in the paper feeding units R1 to R7, and the tension detection roller provided in the paper feeding device R is Based on the detection result, the brake device is controlled. A drag roller 12 that can be driven and rotated by a drive source is provided on the downstream side of the printing apparatus U. By controlling the peripheral speed of the drag roller 12 and the force applied to the dancer roller, the tension of the web W can be controlled. It is adjusted.

  In the printing apparatus U, the printing units U1 to U6 are multicolor printing units capable of performing double-sided four-color printing. However, each printing unit U1-U6 can be made into the printing units U11-U62 which can perform double-sided two-color printing by dividing | segmenting up and down. Each of the printing units U11 to U62 has substantially the same configuration and has an ink supply device, a plate cylinder, a blanket cylinder, and the like, which will be described later. In the present embodiment, each of the printing units U1 to U6 can be mounted with a printing plate corresponding to one page of a newspaper as printed matter along the circumferential direction on the plate cylinder, and the circumferential length (diameter) of the plate cylinder can be set. On the other hand, the circumference (diameter) of the blanket cylinder is set to be the same.

  In the present embodiment, the printing units U1 to U6 are all configured by multi-color printing units, but are not limited to this configuration. For example, various units such as a double-sided two-color printing unit, a double-sided single-color printing unit, a single-sided four-color printing unit or a single-color printing unit may be used in combination as appropriate according to the printed matter.

  In the web pass apparatus D, the web pass unit D1 is provided for the printing units U1 to U3, and the web pass unit D2 is provided for the printing units U4 to U6. Each of the web path units D1 and D2 has substantially the same configuration, and is a slitter that cuts the web W along the longitudinal direction (the longitudinal direction of the web W, the conveyance direction of the web W) at the center in the width direction, and the longitudinal cut. A turn bar for setting the transport path of the web W, and a compensator for adjusting the transport position of the web W in the vertical direction.

  That is, the webs W printed by the printing units U1 to U3 are vertically cut by the slitter in the web pass unit D1, changed by the turn bar, changed by the turn bar, and adjusted by the compensator. Are overlaid in order. Each of the webs W printed by the printing units U4 to U6 is vertically cut by a slitter in the web pass unit D2, is changed by a turn bar, a transfer path is changed, and a transfer position is adjusted by a compensator. They are stacked in order.

  In the folding machine F, the two folding units F1 and F2 are arranged on the operation side and the drive side. That is, when a plurality of webs W1 are overlapped and introduced from the web pass unit D1, the folding unit F1 vertically folds the web W1, cuts it horizontally by a predetermined length, and folds it to form a fold. The paper can be discharged as a newspaper. In addition, when a plurality of webs W2 are overlapped and introduced from the web pass unit D2, the folding unit F2 vertically folds the web W2, cuts the web W2 by a predetermined length, and then horizontally folds to form a fold. The paper can be discharged as a newspaper. In this case, in the folding machine F, the folding units F1 and F2 not only process the webs W1 and W2 from the web path units D1 and D2, but also one of the folding units F1 and F2 can process them together. .

  Therefore, in the web offset press for newspapers, the tensions of the webs W supplied from the paper feeding units R1 to R7 of the paper feeding device R are adjusted by the infeed units I1 to I7 of the infeed device I, respectively. Supplied to the printing units U1 to U6 of the printing apparatus U. Printing is performed on both surfaces of each web W by the printing units U1 to U6 in the printing apparatus U. Each web W printed by each printing unit U1 to U3 is vertically cut by a slitter in the web pass unit D1, changed by a turn bar, changed by a turn bar, and adjusted by a compensator. Are overlaid in order. Each of the webs W printed by the printing units U4 to U6 is vertically cut by a slitter in the web pass unit D2, is changed by a turn bar, a transfer path is changed, and a transfer position is adjusted by a compensator. They are stacked in order.

  Thereafter, in the folding machine F, when a plurality of webs W1 are overlapped and introduced from the web pass unit D1, the folding unit F1 vertically folds the web W1, cuts it horizontally at a predetermined length, and folds it horizontally. Form a compromise and eject it as a newspaper. In addition, when a plurality of webs W2 are overlapped and introduced from the web pass unit D2, the folding unit F2 vertically folds the web W2, cuts the web W2 by a predetermined length, and then horizontally folds to form a fold. The paper is discharged as a newspaper.

  Here, the printing unit U1 in the printing apparatus U will be described in detail. As shown in FIG. 8, the printing unit U1 is an H-type tower unit so that four-color printing is possible. The printing unit U1 includes four stacks 21, 22, 23, black, black, cyan, yellow, and yellow along the conveyance direction of the web W (from bottom to top). 24 is arranged, and each of the stacks 21, 22, 23, and 24 has a roller arrangement that is symmetrical to each other.

  That is, each of the stacks 21, 22, 23, and 24 in the printing unit U1 is opposed to the left and right so that the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b are in contact with each other across the web W conveyance path. The plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b are in contact with the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b. The stacks 21, 22, 23, and 24 are respectively connected to the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, and 44b with ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a and 54b are provided. Further, dampening devices 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b are provided for the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b.

  In this case, in the stacks 21 and 23, the blanket cylinders 31a, 31b, 33a and 33b and the plate cylinders 41a, 41b, 43a and 43b are arranged in a letter C shape, and the stacks 22 and 24 are in the blanket cylinders 32a, 32b and 34a. , 34b and plate cylinders 42a, 42b, 44a, 44b are arranged in an inverted C shape. In each plate cylinder 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, a printing plate (not shown) that prints a different pattern on the outer peripheral surface is 2 in the axial direction, that is, in the width direction of the web W. Two (or four) can be mounted side by side. The number of plates attached may be set as appropriate.

  The ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b are generally composed of an ink fountain, an ink fountain roller, an ink delivery roller, a plurality of ink kneading rollers, a plurality of ink reciprocating rollers, and a plurality of ink supply devices. The ink fountain is the ink supply source of the present invention, and the ink source roller, the ink delivery roller, the plurality of ink kneading rollers, the plurality of ink reciprocating rollers, and the plurality of ink deposition rollers of the present invention Ink supply roller.

  The newspaper rotary offset press of this embodiment includes a web W printing defect detection device 101. FIG. 1 is a schematic configuration diagram illustrating a web printing defect detection apparatus according to the present embodiment, FIG. 2 is an explanatory diagram for explaining a web printing defect detection method, and FIG. 3 is a schematic diagram illustrating printing preparation of a printing press. FIG.

  As shown in FIG. 1, the web W print defect detection device 101 according to the present embodiment includes a control device 102 that controls the operation state of the printing press (printing device U), and an operation device 103 that inputs print defect determination items. A determination data storage unit 104 that stores a threshold value of the reflected light amount of the blank paper portion and the solid printing portion with respect to the determination item, and a first detection sensor (detection sensor) 105 that detects a reflected light amount value of the solid web W. A determination device 106 that compares and compares the reflected light amount value detected by the first detection sensor 105 with the threshold value of the reflected light amount stored in the determination data storage unit 104, and a display device 107 that displays the determination result of the determination device 106 have.

  That is, in the newspaper offset rotary printing press, for example, as shown in FIG. 8, the stack 21 includes blanket cylinders 31a and 31b, plate cylinders 41a and 41b, ink supply devices 51a and 51b, and a dampening device 61a. , 61b are provided. When printing on the web W by the stack 21, the ink supply devices 51a and 51b supply ink to the blanket cylinders 31a and 31b via the plate cylinders 41a and 41b, and the dampening apparatuses 61a and 61b are used for the plate cylinders. Dampening water is supplied to the blanket cylinders 31a and 31b via 41a and 41b. Here, the ink supply position is the image area, and the dampening water supply position is the non-image area. Therefore, if the ink supply devices 51a and 51b supply ink without the dampening devices 61a and 61b supplying the dampening water, the ink is supplied to the entire surface of the blanket cylinders 31a and 31b. When printing is performed in this state, the ink on the entire surface of the blanket cylinders 31a and 31b is transferred to the web W, and solid printing is performed.

  However, the blanket cylinders 31a and 31b are configured by mounting a blanket on the outer peripheral surface of the blanket cylinder main body. The blanket is configured with a rubber layer fixed to a metal substrate, wound around the outer peripheral surface of the blanket cylinder body, and supported at each end in the circumferential direction by a clamping device provided in the gap of the blanket cylinder body. ing. Therefore, the blanket cylinders 31a and 31b do not transfer ink to the position of the gap, and even if solid printing is performed on the web W, as shown in FIG. A blank paper portion B is formed between them. That is, the blank paper portion B is formed by a blanket mounting gap in the blanket cylinders 31a and 31b.

  As shown in FIG. 1, the first detection sensor 105 is, for example, a spot type detector provided at one location in the width direction of the web W or an area type detector provided along the width direction of the web W. Yes, between the web pass unit D1 and the folding unit F1, and disposed above the web W before the plurality of webs W are overlaid. That is, the web path unit D1 includes a slitter 71 that equally cuts the web W into three along the longitudinal direction (web W conveyance direction) in the width direction, and a turn bar that sets the conveyance path of the longitudinally cut web W. 72 and a compensator 73 for adjusting the transport position in the longitudinal direction of the web W. The folding unit F <b> 1 has a drag roller 74 and a triangular plate 75.

  Therefore, the solid-printed web W is conveyed at a predetermined speed by a drag roller (not shown), vertically cut into three by a slitter 71, a conveyance path is changed by a turn bar 72, and a compensator 73 is used for each web W. After the position in the transport direction is adjusted, they are superimposed in a predetermined order. The plurality of webs W <b> 1 are conveyed while being guided by the drag roller 74 in the folding unit F <b> 1 and vertically folded by the triangular plate 75.

  The web pass device D and the folding machine F are composed of two web pass units D1, D2 and folding units F1, F2, and the first detection sensor 105 is located between the web pass unit D1 and the folding unit F1. In addition, it is provided between the web pass unit D2 and the folding unit F2.

  Each first detection sensor 105 detects the surface of the web W before being overlaid. The first detection sensor 105 measures the reflected light amount (reflected light rate) on the surface of the web W, and the determination device 106 binarizes the measurement result (reflected light amount) of the first detection sensor 105, for example. , Grasp whether the printing part A or the blank paper part B. That is, as illustrated in FIG. 2, the determination device 106 recognizes the printing unit A as an OFF signal and recognizes the blank paper portion B as an ON signal based on the measurement result (the amount of reflected light) of the first detection sensor 105. Then, the determination device 106 determines that the position of the blank paper portion B formed on the web W is at a predetermined position based on the detection result of the first detection sensor 105.

  The folding machine F (folding units F1, F2) is configured to vertically fold the web W, horizontally cut it at a predetermined length, and then horizontally fold it to form a fold. And a cutting device (for example, a saw cylinder and a receiving cylinder) for performing horizontal cutting. In this case, the web W on which the image is printed by the printing device U (printing units U1 to U6) is cut between the printed images by the cutting device. When the conveyance position of the web W is shifted, the cutting device does not cut between the print images, but cuts at the position of the print image.

  Each first detection sensor 105 is arranged at a predetermined position on the upstream side in the conveyance direction of the web W by a predetermined distance from the cross cutting position by the cutting device. For this reason, the first detection sensor 105 detects the blank paper portion B at a predetermined position, and the determination device 106 determines that the blank paper portion B is at the horizontal cutting position at a predetermined timing (the timing of the horizontal cutting by the cutting device). Determine if it will arrive.

  In this case, the operator inputs a print defect determination item determined by the operation device 103. Then, the control apparatus 102 performs solid printing on the web W by controlling the operation state of the printing apparatus U. Further, the threshold value of the amount of reflected light between the solid printing portion A and the white paper portion B for this determination item is set in advance through experiments or the like and stored in the determination data storage unit 104. Therefore, the determination device 106 compares and determines the reflected light amount value detected by the first detection sensor 105 and the reflected light amount threshold value stored in the determination data storage unit 104.

  The operation device 103 is for inputting determination items to the determination device 106. The display device 107 displays the determination result by the determination device 106. That is, the operator can use the operation device 103 to output a start command for the defect detection processing of the web W overlapping position by the determination device 106, and the result is displayed on the display device 107. When the position of the blank paper portion B is deviated from the specified position, it is displayed as a cutting register defect. The determination of the deviation from the specified position is obtained by taking into consideration the position of the compensator 73 and, in the case of shaftless drive, the phase angle of the drive motor of the printing unit and the folding machine.

  And the printing defect detection method of the web W of this embodiment includes a step of operating the printing machine at a slow speed to perform solid printing on the web W, and a step of detecting a reflected light amount value of the solid web W. And a step of comparing and determining the detected reflected light amount value and a preset threshold value of the reflected light amount, and a step of displaying the determination result.

  FIG. 4 is a schematic configuration diagram illustrating a blanket defect detection device.

  As illustrated in FIG. 4, the web W print defect detection apparatus 101 according to the present embodiment detects a color missing portion (blank portion) in the print portion (solid print portion) A in the web W that has been printed in a single color. A detection sensor (detection sensor) 111 is provided, and the determination device 106 determines that there is a blanket failure when a color missing portion is detected in the printing portion A based on the detection result of the second detection sensor 111. The second detection sensor 111 is an area type detector provided along the width direction of the web W, for example.

  In this case, as described above, the worker inputs a print defect determination item (blanket defect detection process) determined by the operation device 103. Then, the control apparatus 102 performs solid printing on the web W by controlling the operation state of the printing apparatus U. Further, the threshold value of the amount of reflected light between the solid printing portion A and the white paper portion B for this determination item is set in advance through experiments or the like and stored in the determination data storage unit 104. Therefore, the determination device 106 compares and determines the reflected light amount value detected by the second detection sensor 111 and the threshold value of the reflected light amount stored in the determination data storage unit 104, so that the color omission portion in the solid printing portion A is determined. If detected, it is determined that the blanket is defective, and the display device 107 displays the blanket defect.

  In the blanket cylinders 31a and 31b, when a dent is generated on the surface due to scratches or abrasion, the entire surface cannot be in contact with the web W, so that the ink is not properly transferred and a color loss portion is generated. Therefore, the print defect detection apparatus 101 detects the presence or absence of a color missing portion in the print portion A printed by only the stacks 21, 22, 23, and 24, and determines a blanket failure.

  For example, only the blanket cylinders 31a, 31b of the stack 21 are in contact with the web W, and the blanket cylinders 32a, 32b, 33a, 33b, 34a, 34b of the other stacks 22, 23, 24 are separated from the web W. Transport W. Then, ink is transferred to the web W only from the blanket cylinders 31 a and 31 b of the stack 21, and the second detection sensor 111 detects the surface of the web W. The second detection sensor 111 measures the reflected light amount (reflected light rate) on the surface of the web W, and the determination device 106 binarizes the measurement result (reflected light amount) of the second detection sensor 111, for example. , Grasp whether the printing part A or the color missing part. Based on the detection result of the second detection sensor 111, the determination device 106 detects whether there is a color loss portion in the printing portion A formed on the web W, and if there is a color loss portion in the printing portion A, the blanket. It is determined to be defective.

  The same processing is performed for the stacks 22, 23, and 24, and blanket failure determination is performed for all the blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, and 34b.

  5 and 6 are explanatory diagrams for explaining a printing pressure defect detection method of the printing press.

  Further, as shown in FIG. 5, the printing defect detection device 101 for the web W according to the present embodiment is further transferred by contacting the ink application rolls 81a and 81b and the plate cylinders 41a and 41b in a stopped state, and further blankets. A third detection sensor (detection sensor) 112 for detecting the ink (blank portion) transferred to the web W via the cylinders 31a and 31b is provided, and the determination device 106 determines whether the web is based on the detection result of the third detection sensor 112. It is determined that the length of the printing part C to which the ink has been transferred to W is a preset specified length. The third detection sensor 112 is, for example, a spot type detector provided at one place in the width direction of the web W or an area type detector provided along the width direction of the web W.

  In this case, as described above, the operator inputs a print defect determination item (printing pressure defect detection process) determined by the operation device 103. Then, the control apparatus 102 performs solid printing on the web W by controlling the operation state of the printing apparatus U. Further, the threshold value of the amount of reflected light between the solid printing portion A and the white paper portion B for this determination item is set in advance through experiments or the like and stored in the determination data storage unit 104. Therefore, the determination device 106 compares the reflected light amount value detected by the third detection sensor 112 with the threshold value of the reflected light amount stored in the determination data storage unit 104 to determine the color loss portion in the solid print portion A. If detected, it is determined that the printing pressure is poor, and the display device 107 displays the printing pressure failure.

  That is, the ink form rolls 81a and 81b, the plate cylinders 41a and 41b, and the blanket cylinders 31a and 31b are stopped, and the ink form roll 81a and the plate cylinder 41a are separated. The ink is supplied up to the ink application roll 81a and is not supplied to the plate cylinder 41a and the blanket cylinder 31a. Here, first, after the ink form roll 81a is brought into contact with the plate cylinder 41a by moving it to a specified position, the ink form roll 81a is separated from the plate cylinder 41a again. Then, ink is transferred to a part of the plate cylinder 41a to form an ink transfer portion C1.

  Next, the ink application rolls 81a and 81b, the plate cylinders 41a and 41b, and the blanket cylinders 31a and 31b are rotated, and the ink transfer portion C1 of the plate cylinder 41a is transferred to the web W via the blanket cylinder 31a. C is formed. The third detection sensor 112 detects the surface of the web W. The third detection sensor 112 measures the amount of reflected light (reflected light rate) on the surface of the web W, and the determination device 106 binarizes the measurement result (reflected light amount) of the third detection sensor 112, for example. The length of the web W in the conveyance direction in the printing unit C is grasped. Then, the determination device 106 determines that the length of the printing unit C formed on the web W is within the specified length based on the detection result of the third detection sensor 112.

  When the ink application roll 81a is moved to the specified position where it comes into contact with the plate cylinder 41a and then separated again, the plate cylinder 41a has the ink transfer portion C1 formed on the outer peripheral surface thereof. The circumferential length of the ink transfer portion C1 is determined by the contact pressure (printing pressure) between the ink application roll 81a and the plate cylinder 41a. Therefore, if the length of the printing part C formed on the web W is longer or shorter than the specified length, the control device 103 determines that the printing pressure between the ink application roll 81a and the plate cylinder 41a is poor. To do.

  Further, as shown in FIG. 6, the web W print defect detection device 101 of the present embodiment is transferred by contacting the plate cylinders 41a, 41b and the blanket cylinders 31a, 31b in a stopped state, and further the web W A third detection sensor 112 that detects the ink transferred to the web W is provided, and the determination device 106 sets in advance the length of the printing portion D on which the ink has been transferred to the web W based on the detection result of the third detection sensor 112. It is determined that the specified length is met.

  That is, the ink application rolls 81a and 81b, the plate cylinders 41a and 41b, and the blanket cylinders 31a and 31b are stopped, and the plate cylinder 41a and the blanket cylinder 31a are separated. The ink is supplied up to the plate cylinder 41a and is not supplied to the blanket cylinder 31a. Here, after the plate cylinder 41a is first brought into contact with the blanket cylinder 31a by moving to a specified position, the plate cylinder 41a is separated from the blanket cylinder 31a again. As a result, the ink is transferred to a part of the blanket cylinder 31a to form the ink transfer portion C2.

  Next, the printing roll C is formed by rotating the ink application rolls 81a and 81b, the plate cylinders 41a and 41b, and the blanket cylinders 31a and 31b and transferring the ink transfer section C2 of the blanket cylinder 31a to the web W. The third detection sensor 112 detects the surface of the web W. The third detection sensor 112 measures the amount of reflected light (reflected light rate) on the surface of the web W, and the determination device 106 binarizes the measurement result (reflected light amount) of the third detection sensor 112, for example. The length of the web W in the conveyance direction in the printing unit C is grasped. Then, the determination device 106 determines that the length of the printing unit C formed on the web W is within the specified length based on the detection result of the third detection sensor 112.

  When the plate cylinder 41a is moved to the specified position where it contacts the blanket cylinder 31a and then separated again, the ink transfer portion C2 is formed on the outer peripheral surface of the blanket cylinder 31a. The circumferential length of the ink transfer portion C2 is determined by the contact pressure (printing pressure) between the plate cylinder 41a and the blanket cylinder 31a. Therefore, when the length of the printing part C formed on the web W is longer or shorter than the specified length, the control device 103 determines that the printing pressure between the plate cylinder 41a and the blanket cylinder 31a is defective. .

  In the above description, the determination process of defective printing pressure for the ink application roll 81a, the plate cylinder 41a, and the blanket cylinder 31a has been described. However, the determination of defective printing pressure for the ink application roll 81b, the printing cylinder 41b, and the blanket cylinder 31b is described. Processing is performed in the same manner. At this time, a determination process for defective printing pressure may be simultaneously performed on the ink application rolls 81a and 81b, the plate cylinders 41a and 41b, and the blanket cylinders 31a and 31b.

  Here, the printing preparation work by the newspaper offset rotary printing press of this embodiment will be described. First, as shown in FIG. 5, the printing defect detection apparatus 101 determines whether the printing pressure between the ink application roll 81a and the plate cylinder 41a is good or bad before the start of operation of the printing press. As shown in FIG. 6, it is determined whether the printing pressure between the plate cylinder 41a and the blanket cylinder 31a is good or bad.

  Here, in the printing defect detection apparatus 101, when the determination apparatus 106 determines whether the printing pressure between the ink application roll 81a and the plate cylinder 41a is defective, the display apparatus 107 displays “the ink application roll 81a and the plate. A message such as “need to adjust the printing pressure between the cylinder 41 a” is displayed. If the determination device 106 determines that the printing pressure between the plate cylinder 41a and the blanket cylinder 31a is poor, the display device 107 indicates that “the printing pressure between the plate cylinder 41a and the blanket cylinder 31a needs to be adjusted. A message such as “Yes” is displayed. At this time, the operator adjusts the printing pressure between the cylinders. Further, when the determination device 106 determines that the blanket is defective, the display device 107 displays a message such as “Need to replace the blanket” on the corresponding blanket cylinder. At this time, the operator replaces the blanket.

  Thereafter, as shown in FIG. 3, at time t1, the operator starts the operation of the printing press and operates at the slow speed V1. Here, the printing press performs solid printing, and then the printing defect detection apparatus 101 performs a color missing portion in the printing portion (solid printing portion) A in the single-color printed web W as shown in FIG. Is detected and a blanket defect is determined. That is, as shown in FIG. 1, the print defect detection device 101 detects the blank paper portion B on the web W by the first detection sensors 105, and the determination device 106 determines that the blank paper portion B is at a predetermined timing (by the cutting device). It is determined whether or not the crossing position is reached at the timing of crossing. When the determination device 106 determines that the transport position of the web W is shifted, a message such as “Need to confirm the transport route of the web W” is displayed on the display device 107 with respect to the transport route of the web W Is displayed. At this time, the worker confirms the set value of the compensator or confirms the conveyance path of the web W.

  Then, if it is determined that the printing pressure between the cylinders, the blanket, and the transport path of the web W are appropriate, the operation speed of the printing press is increased to the color adjustment speed V2 at time t2, and at time t3. The color adjustment work for the printed material is started. When the color adjustment work for the printed matter is completed at time t4, the operation speed of the printing press is reduced, and the printing press is stopped at time t5. Here, the printing preparation work by the web offset press for newspaper is completed, the submission of the final document is waited, and the printing work is started after the printing plate is mounted.

  As described above, in the web printing defect detection apparatus according to the present embodiment, the printing apparatus U that can perform solid printing on the web W, the control apparatus 102 that controls the operation state of the printing apparatus U, and the printing defect An operation device 103 for inputting the determination item, a determination data storage unit 104 in which a threshold value of the reflected light amount of the blank paper portion and the solid printing portion for the determination item is stored, and a reflected light amount value of the solid web W is detected. The first detection sensor 105, the determination device 106 that compares the reflected light amount value detected by the first detection sensor 105 with the threshold value of the reflected light amount stored in the determination data storage unit 104, and the determination result of the determination device 106 are displayed. Display device 107.

  Accordingly, since the determination device 106 determines that the position of the blank paper portion B formed on the web W is at the specified position, when the position of the blank paper portion B formed on the web W is not at the specified position, the determination device 106 It is determined that there is a registration failure on the web W, that is, a conveyance position failure. Therefore, it is possible to improve the print quality by detecting the overlapping state on the plurality of webs W, and it is possible to reduce the printing cost by reducing the waste paper. In addition, adjustment for reducing the amount of dampening water is unnecessary as compared with the case of using the black loss gap, and moreover, the defective portion is more reliably detected by detecting the blank portion B by solid printing. be able to.

  In the web printing defect detection apparatus of this embodiment, the blank paper portion B is formed by the blanket mounting gap in the blanket cylinder. Therefore, by forming the blank paper portion B by the blanket mounting gap in the blanket cylinder, it is possible to improve workability without requiring a special printing operation.

  In the web printing defect detection device according to the present embodiment, the first detection sensor 105 is disposed between the web pass device D and the folding machine F so as to face the web W before the plurality of webs W are stacked. Has been. Accordingly, the first detection sensor 105 can appropriately detect the position of the blank paper portion B.

  In the web printing defect detection apparatus according to the present embodiment, the determination apparatus 106 displays a cutting registration defect when the position of the blank paper portion B detected by the first detection sensor 105 is shifted from the specified position. Therefore, for example, when the first detection sensor 105 is arranged at a position spaced a predetermined distance from the cross cutting position of the folding machine F, when the blank paper portion B passing through this position is shifted from the specified position, an appropriate The conveyance deviation of the web W can be detected as a cutting registration failure, and the display device 107 can display the cutting registration failure to accurately notify the operator of the web W overlay failure.

  In the web print defect detection device of this embodiment, the printing device U is operated at a slow speed to perform solid printing. Therefore, the printing apparatus U can perform solid printing when operating at a slow moving speed and perform defect detection, thereby reducing waste paper and reducing printing costs. Conventionally, as shown in FIG. 3, when the operating speed of the printing press is increased to the speed V2 for color adjustment, and the color adjustment operation of the printed matter is performed from time t3, the operator looks at the printed matter and the printing defect ( A printing pressure failure between each cylinder, a blanket failure, and a web W conveyance route failure). Therefore, as shown by a two-dot chain line in FIG. 3, the completion of the printing preparation becomes long, and a large amount of damaged paper is generated.

  That is, when an operator pulls out of a printed material and determines a printing failure, the operator makes a determination by looking at the paper surface on which the design is printed. Therefore, the printing failure (printing pressure failure between each cylinder, blanket failure, web W Cannot be easily determined. For example, if the checked blanket defective portion of the design is a non-image portion, it is not printed on the web W, so it cannot be confirmed that there is a defect. In addition, it cannot be determined whether the gradation portion is originally such a pattern (plate) or a blanket dent. Further, if such blanket defects and printing pressure defects are confirmed after the printing is completed, all of them are reprinted, resulting in a huge amount of paper loss. Moreover, it becomes a complaint from a reader through a store.

  In the web printing defect detection device according to the present embodiment, the second detection sensor 111 that detects a color missing portion in the printing portion A in the web W printed in a single color is provided, and the determination device 106 detects the second detection sensor 111. If a color missing part is detected in the printing part A based on the result, it is determined that the blanket is defective. Therefore, if the blanket has a dent such as a scratch, the ink is not transferred properly. Therefore, if there is a color missing portion in the printing unit A, the determination device 106 determines that the blanket is defective. Therefore, it is possible to improve the printing quality and reduce the printing cost by reducing the waste paper.

  In the web printing defect detection device of the present embodiment, the third detection sensor detects the ink transferred by contacting the inking roll and the plate cylinder in a stopped state and further transferred to the web through the blanket cylinder. 112 is provided, and the determination device 106 determines that the length of the printing unit C on which the ink has been transferred to the web W is within a predetermined specified length based on the detection result of the third detection sensor 112. Accordingly, when the length of the printing portion C formed on the web W is not within the specified length, printing is performed by detecting a printing pressure failure between the ink application roll and the plate cylinder in order to determine a printing pressure failure. The quality can be improved, and the printing cost can be reduced by reducing the amount of waste paper.

  In the web printing defect detection device of the present embodiment, a third detection sensor 112 for detecting ink transferred by contacting the plate cylinder and the blanket cylinder in a stopped state and further transferred to the web W is provided. Based on the detection result of the third detection sensor 112, the device 106 determines that the length of the printing unit C where the ink has been transferred to the web W is a preset specified length. Therefore, when the length of the printing part C formed on the web W is not within the specified length, it is determined that the printing pressure is defective. Therefore, the printing quality is detected by detecting the printing pressure defect between the plate cylinder and the blanket cylinder. In addition, the printing cost can be reduced by reducing waste paper.

  In the web printing defect detection method of the present embodiment, the step of performing solid printing on the web W, the step of detecting the reflected light amount value of the solid web W, the detected reflected light amount value, and The method includes a step of comparing and determining a threshold value of the amount of reflected light set in advance, and a step of displaying a determination result. Therefore, it is possible to detect printing defects on the web W and improve the printing quality, and to reduce the printing cost by reducing the waste paper.

  In the printing machine of the present embodiment, ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b for supplying ink, and plate cylinders 41a, 41b, 42a, for supplying ink, are provided. 42b, 43a, 43b, 44a, 44b, blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b for transferring ink to the web W, and a printing defect detection device 101 for detecting printing defects on the web W. And have. Therefore, it is possible to detect printing defects on the web W and improve the printing quality, and to reduce the printing cost by reducing the waste paper.

  In the above-described embodiment, the first detection sensor 105 that detects the blank paper portion B of the web W after the solid printing is provided, and the determination device 106 overlaps the web W based on the detection result of the first detection sensor 105. However, the present invention is not limited to this configuration. That is, after discharging the solid printed material as a signature, the operator may determine the poor overlay state on the web W by looking at the position of the white paper portion of the printed material.

  In the above-described embodiment, the second detection sensor 111 and the third detection sensor 112 are disposed on the discharge side of the printing apparatus. However, the present invention is not limited to this position. Alternatively, the first detection sensor 105 may be used in combination.

  In the embodiment described above, the printing press of the present invention is applied to a newspaper offset rotary printing press, but may be applied to a commercial offset rotary printing press. Furthermore, in the present embodiment, the printing machine has a plate cylinder. However, a variable printing machine having a blanket cylinder may be used as long as it is a digital printing machine capable of receiving and printing data created by an editing system as it is. Ink jet type or electrophotographic type may be used. In this case, it may be a double-sided printing machine or a single-sided printing machine.

R Paper feeding device I Infeed device U Printing device D Web pass device F Folding machine 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b Blanket cylinder 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b Plate cylinder 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b Ink supply device 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b Dampening device 101 Print defect detection device 102 Control device 103 Operation device 104 Determination data storage unit 105 First detection sensor (detection sensor)
106 determination device 107 display device 111 second detection sensor 112 third detection sensor

Claims (13)

A printing press capable of printing solid on the web;
A determination data storage unit in which a threshold value of the amount of reflected light between the blank paper portion and the solid printing portion with respect to a determination item for printing failure is stored;
A detection sensor for detecting a reflected light amount value of the solid-printed web;
A determination device for comparing and determining a reflected light amount value detected by the detection sensor and a threshold value of the reflected light amount stored in the determination data storage unit;
And a display device for displaying a determination result of the determination device.   The determination device compares and determines the reflected light amount value detected by the detection sensor and the threshold value of the reflected light amount stored in the determination data storage unit, so that the position of the blank paper portion formed on the web is preset. 2. The web printing defect detection apparatus according to claim 1, wherein the web printing defect detection apparatus determines that the web position is at a specified position.   3. The web printing defect according to claim 2, wherein the printing machine includes an ink supply device, a plate cylinder, and a blanket cylinder, and the blank paper portion is formed by a blanket mounting gap in the blanket cylinder. Detection device.   The printing machine includes a plurality of printing units, a web pass device, and a folding machine, and the detection sensor is between the web pass device and the folding machine, and the plurality of webs before being stacked. The web print defect detection device according to claim 1, further comprising a first detection sensor arranged to face the web.   5. The determination device displays a cutting registration failure by the display device when a position of a blank paper portion detected by the first detection sensor is shifted from the specified position. The web printing defect detection device according to any one of the above.   6. The web printing defect detection apparatus according to claim 1, wherein the solid printing is performed by operating the printing machine at a slow speed.   The determination device compares the determination of the reflected light amount value detected by the detection sensor and the threshold value of the reflected light amount stored in the determination data storage unit, and detects a blank sheet portion in the solid printing portion, thereby causing a blanket failure. The web printing defect detection device according to claim 1, wherein the web printing defect detection device is determined to be.   8. The printer according to claim 7, wherein the printing press is capable of multicolor printing, and the detection sensor includes a second detection sensor that detects the blank paper portion in the solid printing portion of the web that has been printed in a single color. The printing defect detection apparatus of the description web.   The determination device compares the value of the reflected light amount detected by the detection sensor with the threshold value of the reflected light amount stored in the determination data storage unit, thereby determining the length of the printing unit on which the ink has been transferred to the web. 2. The web printing defect detection device according to claim 1, wherein it is determined that the predetermined length is set in advance.   The printing machine has an ink form roll, a plate cylinder, and a blanket cylinder, and the detection sensor is transferred by contacting the ink form roll and the plate cylinder in a stopped state, and further passes through the blanket cylinder. The web printing defect detection device according to claim 9, further comprising a third detection sensor that detects ink transferred to the web.   The printing machine has an ink application roll, a plate cylinder, and a blanket cylinder, and the detection sensor is transferred by contacting the plate cylinder and the blanket cylinder in a stopped state, and further transferred to the web. The web printing defect detection device according to claim 9, further comprising a third detection sensor that detects ink. A process of solid printing on the web;
Detecting a reflected light amount value of the solid web,
A step of comparing and determining the detected reflected light amount value and a preset threshold value of the reflected light amount;
Displaying the determination result;
A method for detecting defective printing on a web. An ink supply device for supplying ink;
A plate cylinder to which ink is supplied from the ink supply device;
A blanket cylinder in contact with the plate cylinder;
A web printing defect detection device according to any one of claims 1 to 11,
A printing machine comprising:

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