JP2016068384A - Printer and printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer and a printing method that enable the quantity of a shift in cutting position of a web after a web roll is changed at a paper feed part to converge into an allowable range more quickly without reference to a material of the web to be printed.SOLUTION: In a printer, a paper feed part 10 is configured to unwind a web W from one of a plurality of web rolls 11, 12, and to supply webs W continuously from the plurality of web rolls 11, 12 by switching the web roll as an unwinding source of the web W. When the web rolls 11, 12 are switched at the paper feed part 10, a control part 90 changes cutting control to the other control method on the basis of tension of the web W detected by a tension detection part (for example, tension rollers 22, 52).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a printing machine and a printing method for performing printing on a web such as a strip-shaped paper or film that is continuously conveyed.

  Conventionally, various types of rotary offset printing machines for performing multicolor printing on webs such as strip-like paper and film that are continuously conveyed have been known. In such an offset rotary printing press, in each color printing unit, ink is supplied from an ink fountain and dampening water is supplied from a water fountain, and ink and water are supplied to a plate attached to a plate cylinder through a number of rollers. By supplying, an image is formed on the outer peripheral surface of the plate. Then, the ink is once transferred from the plate to a blanket attached to the blanket cylinder, and the ink is further transferred from the blanket to the web to perform printing on the web. The web on which printing has been performed is heated and dried in the drying section in the next step, cooled in the cooling section, and then cut into a predetermined size in the cutting section.

  Further, in a conventional rotary printing press, a paper feed unit that supplies a belt-shaped web is one in which a plurality of (for example, two) web rolls are rotatably supported by a reel stand or the like. The web can be continuously supplied from a plurality of web rolls by switching the web roll as a web unwinding source during the printing process. However, when the web roll is switched in the paper feeding unit, the web unwound from the old web roll and the web roll unwound from the new web roll are overlapped. The characteristics of the web change drastically. For this reason, immediately after the web roll is switched in the paper feeding unit, there is a problem that the cutting position of the web by the cutting unit is greatly shifted.

  In order to deal with such a problem, Patent Document 1 and Patent Document 2 disclose that the web position is adjusted by a cutting position adjustment unit such as a compensator roller based on the deviation amount of the cutting position of the web detected by a cutting position deviation amount detection unit such as a sensor. A control method is disclosed in which cutting control for adjusting the cutting position of the paper is temporarily turned off when the web roll is switched in the paper feeding unit, and then the cutting control is turned on again. Yes.

JP 2014-40012 A JP 2006-103020 A

  However, when the web roll is switched in the paper feeding unit, the deviation of the web cutting position by the cutting unit varies greatly depending on the material of the web, whereas in the methods disclosed in Patent Document 1 and Patent Document 2, this is the case. For example, when printing on thin paper, the web cutting position by the cutting unit may be greatly shifted after the web roll is switched in the paper feeding unit. was there. On the other hand, when printing on thick paper, the web cutting position shift amount converges within the allowable range more quickly if the above-mentioned cutting control is not turned off when the web roll is switched in the paper feed unit. There was a case. Further, when the cutting control described above is performed so as to be turned off when the web roll is switched in the paper feeding unit, it is necessary to switch the control gain for each web material.

  The present invention has been made in consideration of such points, and the amount of deviation of the cutting position of the web after the web roll is switched in the paper feeding unit regardless of the material of the web on which printing is performed. It is an object of the present invention to provide a printing machine and a printing method that can converge within an allowable range more quickly.

  A printing machine of the present invention is a printing machine that performs printing on a belt-like web that is continuously conveyed, a paper feeding unit that feeds the belt-like web, and a web fed by the paper feeding unit. A conveying unit that continuously conveys; a printing unit that performs printing on a web that is continuously conveyed by the conveying unit; a tension detection unit that detects a tension of the web conveyed by the conveying unit; and the printing A cutting unit for cutting the web printed by the printing unit, a cutting position deviation amount detection unit for detecting a deviation amount of a cutting position of the web to be cut by the cutting unit, and a cutting position of the web by the cutting unit. A cutting position adjustment unit that performs adjustment, and a cutting control that adjusts the cutting position of the web by the cutting position adjustment unit based on the deviation amount of the cutting position of the web detected by the cutting position deviation amount detection unit. And a control unit, wherein the paper feeding unit is configured to unwind the web from one web roll out of the plurality of web rolls, and the plurality of web rolls by switching the web roll from which the web is unwound. The web can be continuously supplied from the web roll, and the control unit detects the web detected by the tension detection unit when the web roll is switched in the paper feeding unit. The cutting control can be changed to another control method based on the tension.

  According to such a printing machine, when the web roll is switched in the paper feeding unit, the cutting control can be changed to another control method based on the web tension detected by the tension detection unit. Therefore, when the web to be printed is, for example, thick paper, plain paper, or thin paper, the method for adjusting the cutting position of the web can be made different. Therefore, regardless of the material of the web on which printing is performed. Therefore, it is possible to more quickly converge the deviation amount of the cutting position of the web after the web roll is switched in the paper feeding unit within the allowable range.

  In the printing press according to the present invention, when the web roll is switched in the paper feed unit, the control unit changes the cutting control to another control method, and then a predetermined condition is satisfied. In addition, another control method may be returned to the cutting control.

  In the printing press according to the aspect of the invention, when the web roll is switched in the paper feeding unit, the control unit detects that the web tension detected by the tension detection unit is smaller than a first predetermined value. In addition, the cutting control may be changed to another control method.

  In this case, when the web roll is switched in the paper feeding unit, the control unit is configured to perform the first operation when the web tension detected by the tension detection unit is smaller than the first predetermined value. The web cutting position is controlled by different control methods when the web tension is smaller than the second predetermined value, which is smaller than the predetermined value of 1, and when the web tension is equal to or greater than the second predetermined value. You may come to adjust.

  Further, the tension detection unit includes a first tension detection part that detects a tension of a web conveyed by the conveyance unit between the paper feeding unit and the printing unit, and the web in the conveyance direction of the web by the conveyance unit. A second tension detecting portion for detecting the tension of the web on the downstream side of the printing unit, and the control unit detects the first tension when the web roll is switched in the paper feeding unit. The cutting control may be changed to another control method based on each of the web tension detected by the detection portion and the web tension detected by the second tension detection portion. .

  In this case, when the web roll is switched in the paper feeding unit, the control unit detects that the web tension detected by the first tension detection portion is smaller than a third predetermined value, and the first When the web tension detected by the two-tension detection portion is smaller than the fourth predetermined value, the cutting control may be changed to another control method.

  Another printing machine of the present invention is a printing machine that performs printing on a belt-like web that is continuously conveyed, and is supplied by the paper feeding unit that feeds the belt-like web and the paper feeding unit. A transport unit that continuously transports the web; a printing unit that performs printing on the web that is continuously transported by the transport unit; a cutting unit that cuts the web printed by the printing unit; A cutting position deviation amount detection unit that detects a deviation amount of a cutting position of a web to be cut by the cutting unit, a cutting position adjustment unit that adjusts a cutting position of the web by the cutting unit, and the cutting position deviation amount detection unit A control unit that performs cutting control such that the cutting position adjustment unit adjusts the cutting position of the web based on a deviation amount of the cutting position of the web detected by the web, and a web that receives information on a material of the web on which printing is performed Material Information receiving means, wherein the paper feeding unit is configured to unwind the web from one web roll out of the plurality of web rolls, and the plurality of web feeding units are switched by switching the web roll as a web unwinding source. The web can be continuously supplied from the web roll, and the control unit is received by the web material information receiving means when the web roll is switched in the paper feeding unit. The cutting control can be changed to another control method based on information on the material of the web.

  According to such a printing machine, when the web roll is switched in the paper feeding unit, the cutting control is changed to another control method based on the information on the web material received by the web material information receiving unit. Since the web to be printed is, for example, thick paper, plain paper, or thin paper, the method for adjusting the cutting position of the web can be different, and therefore printing is performed. Regardless of the material of the web, the amount of deviation of the web cutting position after the web roll is switched in the paper feeding unit can be converged within the allowable range more quickly.

  The printing method of the present invention is a printing method by a printing machine that performs printing on a continuously conveyed belt-like web, the step of feeding the belt-like web by a paper feed unit, and the paper feed unit A step of continuously conveying the supplied web by a conveying unit, a step of printing by a printing unit on a web continuously conveyed by the conveying unit, and a tension of the web conveyed by the conveying unit. A step of detecting by the tension detection unit, a step of cutting the web printed by the printing unit by the cutting unit, and a cutting position deviation amount detection unit for the amount of deviation of the cutting position of the web to be cut by the cutting unit And a cutting position adjustment unit that adjusts the cutting position of the web based on the amount of deviation of the cutting position of the web detected by the cutting position deviation detection unit. And a step of performing control, wherein the paper feeding unit is configured to unwind the web from one web roll among a plurality of web rolls, and by switching the web roll as a web unwinding source. The web can be continuously supplied from a plurality of web rolls, and when the web roll is switched in the paper feeding unit, based on the web tension detected by the tension detection unit. The cutting control can be changed to another control method.

  According to such a printing method, when the web roll is switched in the paper feeding unit, the cutting control can be changed to another control method based on the web tension detected by the tension detection unit. Therefore, when the web to be printed is, for example, thick paper, plain paper, or thin paper, the method for adjusting the cutting position of the web can be made different. Therefore, regardless of the material of the web on which printing is performed. Therefore, it is possible to more quickly converge the deviation amount of the cutting position of the web after the web roll is switched in the paper feeding unit within the allowable range.

  Another printing method of the present invention is a printing method by a printing machine that performs printing on a continuously conveyed belt-like web, the step of feeding the belt-like web by a paper feed unit, and the paper feed A step of continuously conveying the web supplied by the conveyance unit by the conveyance unit, a step of performing printing by the printing unit on the web continuously conveyed by the conveyance unit, and the printing by the printing unit. A step of cutting the web by the cutting unit, a step of detecting a deviation amount of a cutting position of the web to be cut by the cutting unit by a cutting position deviation amount detection unit, and a web detected by the cutting position deviation amount detection unit A cutting control for adjusting the cutting position of the web by the cutting position adjustment unit based on the deviation amount of the cutting position, and a step of inputting information relating to the material of the web on which printing is performed. The paper feeding unit is configured to unwind a web from one web roll out of a plurality of web rolls, and continuously switch webs from a plurality of web rolls by switching a web roll as a web unwinding source. When the web roll is switched in the paper feeding unit, the cutting control is changed to another control method based on the information relating to the input web material. It can be changed.

  According to such a printing method, when the web roll is switched in the paper feeding unit, the cutting control can be changed to another control method based on the input information on the web material. Therefore, if the web to be printed is, for example, thick paper, plain paper, or thin paper, the web cutting position adjustment method can be different, so regardless of the material of the web on which printing is performed. The deviation amount of the web cutting position after the web roll is switched in the paper feeding unit can be converged more quickly within the allowable range.

  According to the printing machine and the printing method of the present invention, the deviation amount of the cutting position of the web after the web roll is switched in the paper feeding unit can be more quickly within the allowable range regardless of the material of the web on which printing is performed. Can be converged to.

It is a schematic block diagram which shows the outline of a structure of the offset rotary printing press by embodiment of this invention. 2 is a flowchart showing an operation when a web roll is switched in a paper feed unit when printing is performed by the rotary offset printing press shown in FIG. 1. It is a flowchart which shows operation | movement when preset control is performed in the offset rotary printing press shown in FIG. It is a flowchart which shows operation | movement when on / off control is performed in the offset rotary printing press shown in FIG. 6 is a table showing the relationship between the infeed tension value and the cooling tension value and the control switching content when the web roll is switched in the paper feed unit when printing is performed by the offset rotary printing press shown in FIG. 1. . It is a table | surface which shows the relationship between the cooling tension value and the switching content of control when a web roll is switched in a paper feed part when printing is performed by the offset rotary printing press which concerns on a modification. When the web roll is switched in the paper feeding unit when printing is performed on each of thick paper, plain paper, and thin paper by the rotary offset printing press shown in FIG. It is a graph which shows a change. 3 is a graph showing a change over time in a deviation amount of a web cutting position when a web roll is switched in a paper feed unit when printing is performed on thin paper by the rotary offset printing press shown in FIG. 1. .

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 to FIG. 5 are diagrams showing an offset rotary printing press according to the present embodiment and a printing method using such a printing press.

  As shown in FIG. 1, an offset rotary printing press (hereinafter also simply referred to as a printing press) according to the present embodiment includes a paper feed unit 10 that supplies a web W such as paper or film, and a web feed from the paper feed unit 10. An infeed unit 20 to which W is sent, a plurality (specifically, for example, four) of printing units 30 that perform printing of each color on the web W sent from the infeed unit 20, and each printing unit 30 A drying unit 40 for drying the printed web W, a cooling unit 50 for cooling the web W dried by the drying unit 40, a traveling position of the web W sent from the cooling unit 50, After the web path unit 60 for stabilizing the running posture and the web W that has passed through the web path unit 60 are folded in two vertically, the web W is sized to the size of the pattern printed by each printing unit 30 as a unit. Cutting And a folding machine 70 for folding Te. Hereinafter, each component of the offset rotary printing press having such a configuration will be described in detail.

  The paper feed unit 10 is provided with a web roll support unit 13 such as a reel stand that rotatably supports the web rolls 11 and 12, and the new and old web rolls are connected to each other in the middle of the printing process. The web W is supplied. In FIG. 1, the web roll 11 is in use in the printing process (ie, the old web roll) and the web roll 12 is prepared for the next use (ie, the new web roll). The web roll support portion 13 has an arm portion 13a that can rotate around a shaft 13b, and the web rolls 11 and 12 are rotatably disposed at both ends of the arm portion 13a, respectively. Yes. In addition, the arm 13a is rotated 180 ° clockwise around the shaft 13b from the state shown in FIG. 1 to switch the web W unwinding source from the old web roll 11 to the new web roll 12. ing.

  The infeed unit 20 is configured to send the web W to each printing unit 30 while adjusting the tension of the web W (the tension of the web W) sent from the paper feeding unit 10. The infeed unit 20 is provided with a tension roller 22 that measures the tension of the web W adjusted by the infeed unit 20. The tension of the web W measured by the tension roller 22 is the infeed tension. The value is transmitted to the control unit 90 described later. Note that such an infeed tension value is set by an operator mainly based on the material of the web W (usually proportional to the thickness of the paper).

  In the printing machine according to the present embodiment, four or more printing units 30 corresponding to each color such as black, cyan, magenta, and yellow are provided so as to be arranged in series along the web W conveyance direction. Each printing unit 30 is provided with a pair of upper and lower plate cylinders 32 and a pair of upper and lower blanket cylinders 34 provided so as to come into contact with each plate cylinder 32. By providing a pair of upper and lower plate cylinders 32 and a blanket cylinder 34 in each printing unit 30, printing can be performed on both surfaces of the web W at a time. More specifically, in each printing unit 30, ink is supplied from an ink fountain (not shown) and dampening water is supplied from a water fountain (not shown), and is attached to the plate cylinder 32 via a number of rollers. An image is formed on the outer peripheral surface of the plate by supplying ink and water to the plate. Then, the ink is once transferred from the plate to a blanket attached to the blanket cylinder 34, and the ink is further transferred from the blanket to the web W to perform printing on the web W. Printing by each printing unit 30 is performed on the same area on the web W, and thus, one color is formed by superimposing colors in the same area. In each printing unit 30, a registration mark is attached in the vicinity of the end in the width direction of the web W.

  A register mark detection sensor (not shown) is provided after the exit of the printing unit 30 for the fourth color, and the register mark attached to the web W by each printing unit 30 is detected by the register mark detection sensor. It has come to be. The amount of misregistration of printing on the web W is detected based on detection information of each registration mark by the registration mark detection sensor. Such a registration mark detection sensor may be installed in the web path unit 60 in addition to the exit of the printing unit 30.

  The web W on which printing has been performed in each printing unit 30 is heated and dried by the drying unit 40 in the next step, and then cooled by the cooling unit 50. Thereafter, the web W is sent from the cooling unit 50 to the web path unit 60. The drying unit 40 is a device for drying the ink on the web W that has passed through each printing unit 30, and the cooling unit 50 appropriately stores the web W that stores excess heat after drying in the drying unit 40. It is a device for cooling to a suitable temperature. The cooling unit 50 is provided with a tension roller 52 that measures the tension of the web W cooled by the cooling unit 50. The tension of the web W measured by the tension roller 52 is described later as a cooling tension value. Is transmitted to the control unit 90. Note that such a cooling tension value changes mainly depending on the specifications of the printing press or the habit of an operator's operation.

  The web path unit 60 stabilizes the traveling position and traveling posture of the web W sent from the cooling unit 50. The web path section 60 is provided with a compensator roller 62, and the position of the compensator roller 62 is driven by a compensator motor 64. When the compensator motor 64 adjusts the position of the compensator roller 62, the cutting position of the web W is adjusted by a saw cylinder 74 described later.

  As shown in FIG. 1, the folding machine 70 is provided with a triangular plate 71, a pair of nipping rollers 73, a saw cylinder 74, and a folding cylinder 75, and the web W sent from the web path unit 60 to the folding machine 70. Is folded in half by a triangular plate 71, passes between a pair of nipping rollers 73, is cut at a predetermined position by a saw cylinder 74 and a folding cylinder 75, and is folded to form a folded book, This origami is carried out to the outside.

  In the printing machine of the present embodiment, a guide roll (not shown) for continuously conveying the web W is provided in the infeed unit 20, the cooling unit 50, the web pass unit 60, and the like. The infeed unit 20, the cooling unit 50, and the web path unit 60 are provided with drive motors 80, 82, and 84, respectively. The drive motors 80, 82, and 84 provide the infeed unit 20 and the cooling unit 50. The guide rolls provided in the web path unit 60 are rotationally driven. And by rotating each guide roll with the drive motors 80, 82, and 84, the web W is continuously conveyed with each guide roll. Moreover, the conveyance speed of the web W is adjusted by the control part 90 mentioned later. Each printing unit 30 is provided with a drive motor 81 for driving the plate cylinder 32 to rotate.

  In addition, a sensor 88 that detects the print state of the web W is provided between the web pass unit 60 and the folding machine 70. For example, a camera can be used as the sensor 88, and it is possible to detect that a portion to be cut on the web W has passed a reference point by processing a camera image.

  Further, as shown in FIG. 1, in the present embodiment, a control unit 90 is provided for controlling each component of the printing press. The control unit 90 is connected to the compensator motor 64, the drive motors 80, 81, 82, 84 and the sensor 88. Information detected by the sensor 88 is sent to the control unit 90, and the control unit 90 is connected to the compensator motor 64. And the drive of each drive motor 80, 81, 82, 84 is controlled. More specifically, the control unit 90 controls the compensator motor 64 based on information detected by the sensor 88 and adjusts the position of the compensator roller 62, thereby setting the cutting position of the web W by the saw cylinder 74 of the folding machine 70. It comes to adjust. That is, the sensor 88 functions as a cutting position deviation amount detection unit that detects the deviation amount of the cutting position of the web W to be cut by the saw cylinder 74 of the folding machine 70, and the compensator roller 62 and the compensator motor 64 are folded. It functions as a cutting position adjusting unit that adjusts the cutting position of the web W by the saw cylinder 74 of the machine 70, and the control unit 90 detects the web detected by the sensor 88 as such a cutting position deviation amount detecting unit. Cutting control is performed such that the cutting position of the web W is adjusted by the compensator roller 62 as a cutting position adjusting unit based on the amount of shift of the cutting position of W.

  The control unit 90 controls the drive motors 80, 82, and 84 to adjust the web W conveyance speed. The control unit 90 controls each drive motor 81 and adjusts the phase of the plate cylinder 32 of each printing unit 30 to perform printing registration on the web W.

  In the present embodiment, the control unit 90 is provided in the tension roller 22 and the cooling unit 50 provided in the infeed unit 20 when the web rolls 11 and 12 are switched in the paper supply unit 10. Based on the tension of the web W detected by the tension roller 52 (specifically, the infeed tension value and the cooling tension value), the cutting control can be changed to another control method. Yes. This will be described in detail with reference to the flowcharts shown in FIGS.

  When the normal printing process is performed in the printing press (STEP 1), as described above, the control unit 90 sets the amount of deviation of the cutting position of the web W detected by the sensor 88 as the cutting position deviation amount detection unit. Based on this, cutting control (normal control) is performed such that the cutting position of the web W is adjusted by the compensator roller 62 serving as a cutting position adjusting unit. On the other hand, when the web rolls 11 and 12 are switched in the paper feed unit 10 (“YES” in STEP 2), the control unit 90 detects the web W in detected by the tension roller 22 provided in the infeed unit 20. Based on the feed tension value and the cooling tension value of the web W detected by the tension roller 52 provided in the cooling unit 50, it is determined whether or not the normal control is switched to another control method (STEP 3). Such a determination method will be described in detail with reference to the table shown in FIG.

  When the web rolls 11 and 12 are switched in the paper feeding unit 10, the infeed tension value of the web W detected by the tension roller 22 provided in the infeed unit 20 is equal to or less than a predetermined value a1, and When the cooling tension value of the web W detected by the tension roller 52 provided in the cooling unit 50 is equal to or less than the predetermined value b1 (“YES” in STEP 4), the control unit 90 changes the normal control to the preset control. Switch (STEP 5). Then, when a predetermined condition is satisfied, the control unit 90 switches the preset control to the original normal control (that is, the cutting control described above) (STEP 6). The infeed tension value of the web W detected by the tension roller 22 provided in the infeed unit 20 is equal to or less than a predetermined value a1, and the web W detected by the tension roller 52 provided in the cooling unit 50 is detected. As a case where the cooling tension value is equal to or less than the predetermined value b1, a case where the web W on which the printing is performed is, for example, thin paper can be considered. Details of such preset control will be described later.

  In addition, when the web rolls 11 and 12 are switched in the paper feeding unit 10, when the normal control is not switched to the preset control in the control unit 90 (“NO” in STEP 4), the infeed unit 20 is provided. The in-feed tension value of the web W detected by the tension roller 22 is equal to or less than the predetermined value a2 larger than the predetermined value a1, and the cooling tension value of the web W detected by the tension roller 52 provided in the cooling unit 50 Is equal to or less than the predetermined value b2 larger than the predetermined value b1 (“YES” in STEP 7), the control unit 90 switches the above normal control to on / off control (STEP 8). Then, when a predetermined condition is satisfied, the control unit 90 switches the on / off control to the original normal control (that is, the cutting control described above) (STEP 9). Details of such on / off control will be described later. The infeed tension value of the web W detected by the tension roller 22 provided in the infeed unit 20 is equal to or less than a predetermined value a2, and the web W detected by the tension roller 52 provided in the cooling unit 50 is detected. As a case where the cooling tension value is equal to or less than the predetermined value b2, a case where the web W on which printing is performed is, for example, plain paper can be considered. Details of such on / off control will be described later.

  Whether the infeed tension value of the web W detected by the tension roller 22 provided in the infeed unit 20 is greater than the predetermined value a2 when the web rolls 11 and 12 are switched in the sheet feeding unit 10. Alternatively, when the cooling tension value of the web W detected by the tension roller 52 provided in the cooling unit 50 is larger than the predetermined value b2 (“NO” in STEP 7), the control unit 90 performs the normal control described above. The process is continued without switching to the control method (STEP 10). The infeed tension value of the web W detected by the tension roller 22 provided in the infeed unit 20 is larger than the predetermined value a2, or the web W detected by the tension roller 52 provided in the cooling unit 50 is detected. As a case where the cooling tension value is larger than the predetermined value b2, it is conceivable that the web W on which printing is performed is, for example, cardboard.

  The operations shown in STEP 1 to STEP 10 described above are performed until printing is completed in the printing press (STEP 11).

  Next, the operation when the control unit 90 performs the preset control will be described with reference to the flowchart shown in FIG.

  When the control unit 90 switches the normal control to the preset control when the web rolls 11 and 12 are switched in the paper supply unit 10, counting is started (STEP 101). Here, the number counting is to count how many webs W are conveyed in the number of webs W after being cut by the saw cylinder 74 of the folding machine 70. For example, when the web W of the amount of five sheets after being cut by the saw cylinder 74 of the folding machine 70 is conveyed, the number count is five. When the count value reaches the predetermined number (s1) set in advance (“YES” in STEP 102), the control unit 90 turns off the cutting control (STEP 103). Further, the control unit 90 drives the compensator motor 64 in the web path unit 60 to move the compensator roller 62 by a predetermined amount (STEP 104). Here, the movement amount (that is, the preset value) of the compensator roller 62 is determined by the past operation results in the printing press. When the count value reaches the predetermined number (s2) set in advance (“YES” in STEP 105), the control unit 90 turns on the cutting control (STEP 106).

  Thereafter, when the deviation amount of the cutting position of the web W is detected by the sensor 88 as the cutting position deviation amount detection unit (SPTE107), when the deviation amount of the cutting position of the web W is within the allowable range (STEP108). If the predetermined condition is satisfied, the control unit 90 switches the preset control to the original normal control (STEP 6 in FIG. 2). On the other hand, if the deviation amount of the cutting position of the web W detected by the sensor 88 is outside the allowable range (“NO” in STEP 108), the control unit 90 turns off the cutting control again (STEP 109). Thereafter, the control unit 90 drives the compensator motor 64 in the web pass unit 60 to adjust the position of the compensator roller 62 until the deviation amount of the cutting position of the web W falls within the allowable range (STEP 110). If the deviation amount of the cutting position of the web W continues to be within the allowable range until the number count reaches the predetermined number (s3) (“YES” in STEP 111), it is determined that the predetermined condition is satisfied and the control unit 90 switches the preset control to the original normal control (STEP 6 in FIG. 2).

  Next, the operation when the control unit 90 performs the on / off control will be described with reference to the flowchart shown in FIG.

  When the web rolls 11 and 12 are switched in the paper supply unit 10, the count is started when the control unit 90 switches the normal control to on / off control (STEP 201). When the count value reaches the predetermined number (s1) set in advance (“YES” in STEP 202), the control unit 90 turns off the cutting control (STEP 203). When the on / off control is performed, the compensator roller 62 is not moved by a predetermined amount (preset value), unlike the case where the preset control is performed. When the count value reaches the predetermined number (s2) set in advance (“YES” in STEP 204), the control unit 90 turns on the cutting control (STEP 205).

  After that, when the deviation amount of the cutting position of the web W is detected by the sensor 88 as the cutting position deviation amount detection unit (SPTE 206), when the deviation amount of the cutting position of the web W is within the allowable range (STEP 207). If the predetermined condition is satisfied, the control unit 90 switches the on / off control to the original normal control (STEP 9 in FIG. 2). On the other hand, when the deviation amount of the cutting position of the web W detected by the sensor 88 is outside the allowable range (“NO” in STEP 207), the control unit 90 turns off the cutting control again (STEP 208). Thereafter, the controller 90 adjusts the position of the compensator roller 62 by driving the compensator motor 64 in the web path 60 until the deviation amount of the cutting position of the web W falls within the allowable range (STEP 209). When the deviation amount of the cutting position of the web W continues to be within the allowable range until the predetermined count (s3) has elapsed (STEP 210 "YES"), it is determined that the predetermined condition is satisfied and the control unit 90 switches the on / off control to the original normal control (STEP 9 in FIG. 2).

  FIG. 7 shows the cutting of the web W when the web rolls 11 and 12 are switched in the paper supply unit 10 when printing is performed on each of thick paper, plain paper, and thin paper by the printing machine shown in FIG. It is a graph which shows a time-dependent change of the amount of position shift. In FIG. 7, after the web rolls 11 and 12 are switched in the paper feeding unit 10, the control unit 90 continues the normal control (the cutting control described above) without switching to another control method. A deviation amount of the cutting position of the web W is shown. As shown in FIG. 7, when the web W to be printed is cardboard, even if the web rolls 11 and 12 are switched in the paper feeding unit 10, the deviation amount of the cutting position of the web W is within an allowable range. (Specifically, the area between “−m” and “+ m” in the graph of FIG. 7) is converged, but when the web W to be printed is plain paper or thin paper, the paper feed unit 10, when the web rolls 11 and 12 are switched, the shift amount of the cutting position of the web W may be outside the allowable range. Further, when the web W to be printed is thin paper, the web when the web rolls 11 and 12 are switched in the paper feeding unit 10 is more than when the web W to be printed is plain paper. The amount of change in the shift amount of the cutting position of W becomes large. For this reason, in the present embodiment, when the web W to be printed is plain paper or thin paper, the control unit 90 is normally configured when the web rolls 11 and 12 are switched in the paper feed unit 10. By switching the control (the above cutting control) to another control method (specifically, preset control or on / off control), the deviation amount of the cutting position of the web W is converged within the allowable range as quickly as possible. Yes. Further, when preset control as shown in the flowchart of FIG. 3 is performed, the compensator roller 62 is moved by a predetermined amount (preset value) when the cutting control is turned off, so that the flowchart of FIG. 4 shows. The larger shift amount of the cutting position of the web W can be quickly converged within the allowable range than when such on / off control is performed. Therefore, when the web W to be printed is thin paper, the normal control is switched to the preset control, and when the web W to be printed is plain paper, the normal control is switched to the on / off control. I have to.

  FIG. 8 is a graph showing the shift amount of the cutting position of the web W when the web rolls 11 and 12 are switched in the paper supply unit 10 when printing is performed on thin paper by the offset printing machine shown in FIG. It is a graph which shows a typical change. In FIG. 8, the cutting position of the web W when the control unit 90 switches the normal control (the above-described cutting control) to the preset control after the web rolls 11 and 12 are switched in the paper feeding unit 10. The amount of deviation is shown. When the control unit 90 performs the preset control, as described above, when the number count value reaches a predetermined number (s1) set in advance, the control unit 90 turns off the cutting control, and the web pass unit 60 The compensator roller 62 is driven to move the compensator roller 62 by a predetermined amount. Here, as described above, the movement amount (that is, the preset value) of the compensator roller 62 is determined by the past operation results in the printing press. When the count value reaches a predetermined number (s2) set in advance, the control unit 90 turns on the cutting control. By performing such preset control, the normal control as shown by the dotted line in FIG. 7 is compared with the change over time in the amount of deviation of the cutting position of the web W when the normal control is not switched to the preset control. It becomes possible to quickly converge the deviation amount of the cutting position within the allowable range.

  According to the printing machine of the present embodiment having the above-described configuration and the printing method using such a printing machine, the control unit 90 allows the web rolls 11 and 12 to be switched in the paper feeding unit 10. Based on the tension of the web W detected by the tension rollers 22 and 52 as the tension detection unit, the cutting control (that is, the amount of deviation of the cutting position of the web W detected by the sensor 88 as the cutting position deviation amount detection unit). The control method of adjusting the cutting position of the web W by the compensator roller 62 as the cutting position adjusting unit can be changed to another control method. For this reason, when the web W to be printed is, for example, thick paper, plain paper, or thin paper, the adjustment method of the cutting position of the web W can be different. Therefore, regardless of the material of the web W to be printed The shift amount of the cutting position of the web W after the web rolls 11 and 12 are switched in the paper supply unit 10 can be converged within an allowable range more quickly.

  In the printing machine according to the present embodiment, as described above, the tension detection unit detects the tension of the infeed unit 20 that detects the tension of the web W conveyed between the paper supply unit 10 and the printing unit 30. A roller 22 (first tension detection portion) and a tension roller 52 (second tension detection portion) of the cooling unit 50 that detects the tension of the web W downstream of the printing unit 30 in the conveyance direction of the web W. The control unit 90 controls the infeed tension value of the web W detected by the tension roller 22 of the infeed unit 20 and the cooling unit 50 when the web rolls 11 and 12 are switched in the sheet feeding unit 10. Based on each cooling tension value of the web W detected by the tension roller 52, the cutting system And it is capable of changing the other control methods. More specifically, the control unit 90 determines whether the infeed tension value of the web W detected by the tension roller 22 of the infeed unit 20 when the web rolls 11 and 12 are switched in the sheet feeding unit 10 is predetermined. When the cooling tension value of the web W detected by the tension roller 52 of the cooling unit 50 is smaller than the value a2 and smaller than the predetermined value b2, the cutting control is performed by another control method (specifically, preset control or On-off control). Here, as described above, the infeed tension value is set by the operator based on the material of the web W (usually proportional to the paper thickness). In addition, since the cooling tension value changes mainly due to the specifications of the printing press or the habit of the operator's operation, when the above operation is performed, the material of the web W, the specifications of the printing press, It is possible to determine whether or not to change the cutting control to another control method in consideration of both habits in the operation of the operator.

  In addition, the printing machine by this invention and the printing method by such a printing machine are not limited to the thing of the above structures, A various change can be added.

  For example, the control unit 90 performs cutting control based only on the cooling tension value of the web W detected by the tension roller 52 of the cooling unit 50 when the web rolls 11 and 12 are switched in the paper feeding unit 10. May be changed to another control method. Such operation will be described with reference to the table shown in FIG.

  As shown in the table of FIG. 6, when the web rolls 11 and 12 are switched in the paper supply unit 10, the cooling tension value of the web W detected by the tension roller 52 provided in the cooling unit 50 is predetermined. When the value is less than or equal to the value b1, the control unit 90 switches the normal control (the cutting control) to the preset control as shown in the flowchart of FIG. Then, the control unit 90 switches the preset control to the original normal control when a predetermined condition is satisfied. Further, when the web rolls 11 and 12 are switched in the paper feeding unit 10, the cooling tension value of the web W detected by the tension roller 52 provided in the cooling unit 50 is larger than the predetermined value b1, When the value is equal to or smaller than the predetermined value b2 larger than the predetermined value b1, the control unit 90 switches the normal control (the cutting control described above) to on / off control. Then, the control unit 90 switches the on / off control to the original normal control when a predetermined condition is satisfied. In addition, when the web rolls 11 and 12 are switched in the paper supply unit 10, the cooling tension value of the web W detected by the tension roller 52 provided in the cooling unit 50 is larger than the predetermined value b2. The control unit 90 continues the above normal control without switching to another control method.

  As described above, when the web rolls 11 and 12 are switched in the paper supply unit 10, the cutting control is controlled based on only the cooling tension value of the web W detected by the tension roller 52 of the cooling unit 50. When determining whether or not to change the method, the tension of the web W at a location closer to the location where the web W is cut (specifically, the saw cylinder 74 of the folding machine 70) (that is, the cooling tension value). Can be reflected in the control in the control unit 90, and it is possible to determine whether or not to change the cutting control to another control method in consideration of the specifications of the printing press and the habit of the operation of the operator. It becomes like this.

  Further, in the printing press according to another modification, when the web rolls 11 and 12 are switched in the paper feeding unit 10, the control method changed from the cutting control is any one of preset control and on / off control. Only one of the controls may be used. For example, when the web rolls 11 and 12 are switched in the paper supply unit 10 and the control method changed from the cutting control is only on / off control, the infeed unit in the table shown in FIG. When the in-feed tension value of the web W detected by the 20 tension rollers 22 is smaller than the predetermined value a2, and the cooling tension value of the web W detected by the tension roller 52 of the cooling unit 50 is smaller than the predetermined value b2. In addition, the cutting control is changed to on / off control. In this case, the web W infeed tension value detected by the tension roller 22 of the infeed unit 20 is smaller than the predetermined value a1, and the web W cooling tension value detected by the tension roller 52 of the cooling unit 50. Even when is smaller than the predetermined value b1, the cutting control is changed to the on / off control.

  In another aspect, when the web rolls 11 and 12 are switched in the paper feeding unit 10, the infeed of the web W detected by the tension roller 22 of the infeed unit 20 in the table shown in FIG. When the tension value is smaller than the predetermined value a2 and the cooling tension value of the web W detected by the tension roller 52 of the cooling unit 50 is smaller than the predetermined value b2, the cutting control is changed to the preset control. It may be.

  Further, the printing machine according to the present invention and the printing method using such a printing machine are based on the tension of the web W detected by the tension detection unit when the web rolls 11 and 12 are switched in the paper feeding unit 10. Thus, the present invention is not limited to the one that can change the cutting control to another control method. As a printing machine having another configuration, input means such as a touch panel and operation keys are provided for an operator to input information related to the material of the web W on which printing is performed. Information that is received by the web material information receiving means of the printing press may be used. Then, when the web rolls 11 and 12 are switched in the paper feeding unit 10, the cutting control is changed to another control method based on the information related to the material of the web W received by the web material information receiving unit. Will come to be. Specifically, for example, the operator may be able to select one of thin paper, plain paper, and thick paper as the material of the web W by the input means. In this case, when the web rolls 11 and 12 are switched in the paper supply unit 10 and the thin paper is selected as the material of the web W, the normal control is preset as shown in the flowchart of FIG. In addition, when the plain paper is selected as the material of the web W, the normal control is switched to the on / off control as shown in the flowchart of FIG. Further, when the web rolls 11 and 12 are switched in the paper supply unit 10, if thick paper is selected as the material of the web W, the normal control is continued without switching to another control method. To do.

  According to the printing machine configured as described above and the printing method using the printing machine, the material of the web W received by the web material information receiving unit when the web rolls 11 and 12 are switched in the paper supply unit 10. The cutting position of the web W by the compensator roller 62 as the cutting position adjusting unit based on the cutting control (that is, the deviation amount of the cutting position of the web W detected by the sensor 88 as the cutting position deviation detecting unit). The control method to be adjusted) can be changed to another control method. For this reason, when the web W to be printed is, for example, thick paper, plain paper, or thin paper, the adjustment method of the cutting position of the web W can be different. Therefore, regardless of the material of the web W to be printed The shift amount of the cutting position of the web W after the web rolls 11 and 12 are switched in the paper supply unit 10 can be converged within an allowable range more quickly.

DESCRIPTION OF SYMBOLS 10 Paper feed part 11, 12 Web roll 13 Web roll support part 13a Arm part 13b Shaft 20 Infeed part 22 Tension roller 30 Printing unit 32 Plate cylinder 34 Blanket cylinder 40 Drying part 50 Cooling part 52 Tension roller 60 Web path part 62 Compensator Roller 64 Compensation motor 70 Folding machine 71 Triangle plate 73 Nipping roller 74 Saw cylinder 75 Folding cylinder 80, 81, 82, 84 Drive motor 88 Sensor 90 Control unit W Web

Claims (9)

A printing machine that performs printing on a belt-like web that is continuously conveyed,
A paper feeding unit for feeding a belt-shaped web;
A transport unit that continuously transports the web supplied by the paper feed unit;
A printing unit that performs printing on the web continuously conveyed by the conveyance unit;
A tension detection unit for detecting the tension of the web conveyed by the conveyance unit;
A cutting unit that cuts the web printed by the printing unit;
A cutting position deviation amount detecting unit for detecting a deviation amount of a cutting position of the web to be cut by the cutting unit;
A cutting position adjusting unit for adjusting a cutting position of the web by the cutting unit;
A control unit that performs cutting control such that the cutting position adjustment unit adjusts the cutting position of the web based on the deviation amount of the cutting position of the web detected by the cutting position deviation amount detection unit;
With
The paper feeding unit is configured to unwind a web from one web roll out of a plurality of web rolls, and continuously switch webs from a plurality of web rolls by switching a web roll as a web unwinding source. Can be supplied,
The control unit can change the cutting control to another control method based on the web tension detected by the tension detection unit when the web roll is switched in the paper feeding unit. A printing press that is supposed to be.   The control unit changes the cutting control to another control method when the web roll is switched in the paper feeding unit, and then switches the other control method to the cutting method when a predetermined condition is satisfied. 2. A printing press according to claim 1, wherein the printing press is brought back to control.   When the web roll is switched in the paper feeding unit, the control unit performs the cutting control when the web tension detected by the tension detection unit is smaller than a first predetermined value. The printing press according to claim 1 or 2, wherein the printing method is changed to a control method.   When the web roll is switched in the paper feeding unit, the control unit is configured to detect the first predetermined value when the web tension detected by the tension detection unit is smaller than the first predetermined value. The web cutting position is adjusted by a different control method between when the web tension is smaller than the second predetermined value, which is smaller than the value, and when the web tension is greater than or equal to the second predetermined value. The printing press according to claim 3, which is configured as described above. The tension detection unit includes a first tension detection part that detects a tension of a web conveyed by the conveyance unit between the paper feeding unit and the printing unit, and the printing unit in a web conveyance direction by the conveyance unit. A second tension detecting portion for detecting the tension of the web on the downstream side of the web,
Each of the web tension detected by the first tension detection portion and the web tension detected by the second tension detection portion when the web roll is switched in the paper feeding portion. The printing machine according to claim 1 or 2, wherein the cutting control can be changed to another control method based on the method.   When the web roll is switched in the paper feeding unit, the control unit detects that the web tension detected by the first tension detection portion is smaller than a third predetermined value and the second tension detection. The printing machine according to claim 5, wherein when the web tension detected by the portion is smaller than a fourth predetermined value, the cutting control is changed to another control method. A printing machine that performs printing on a belt-like web that is continuously conveyed,
A paper feeding unit for feeding a belt-shaped web;
A transport unit that continuously transports the web supplied by the paper feed unit;
A printing unit that performs printing on the web continuously conveyed by the conveyance unit;
A cutting unit that cuts the web printed by the printing unit;
A cutting position deviation amount detecting unit for detecting a deviation amount of a cutting position of the web to be cut by the cutting unit;
A cutting position adjusting unit for adjusting a cutting position of the web by the cutting unit;
A control unit that performs cutting control such that the cutting position adjustment unit adjusts the cutting position of the web based on the deviation amount of the cutting position of the web detected by the cutting position deviation amount detection unit;
Web material information receiving means for receiving information relating to the material of the web on which printing is performed;
With
The paper feeding unit is configured to unwind a web from one web roll out of a plurality of web rolls, and continuously switch webs from a plurality of web rolls by switching a web roll as a web unwinding source. Can be supplied,
The control unit changes the cutting control to another control method based on information on the web material received by the web material information receiving unit when the web roll is switched in the paper feeding unit. A printing press that can be changed. A printing method by a printing machine that performs printing on a belt-like web that is continuously conveyed,
A step of supplying a belt-shaped web by a paper feeding unit;
A step of continuously conveying the web supplied by the paper feeding unit by a conveying unit;
A step of performing printing by a printing unit on a web continuously conveyed by the conveying unit;
Detecting a tension of a web conveyed by the conveyance unit by a tension detection unit;
Cutting the web printed by the printing unit with a cutting unit;
A step of detecting, by a cutting position deviation amount detection unit, a deviation amount of a cutting position of the web to be cut by the cutting unit;
A step of performing cutting control such that the cutting position adjusting unit adjusts the cutting position of the web based on the amount of deviation of the cutting position of the web detected by the cutting position deviation amount detecting unit;
With
The paper feeding unit is configured to unwind a web from one web roll out of a plurality of web rolls, and continuously switch webs from a plurality of web rolls by switching a web roll as a web unwinding source. Can be supplied,
When the web roll is switched in the paper feeding unit, the cutting control can be changed to another control method based on the web tension detected by the tension detection unit. , Printing method. A printing method by a printing machine that performs printing on a belt-like web that is continuously conveyed,
A step of supplying a belt-shaped web by a paper feeding unit;
A step of continuously conveying the web supplied by the paper feeding unit by a conveying unit;
A step of performing printing by a printing unit on a web continuously conveyed by the conveying unit;
Cutting the web printed by the printing unit with a cutting unit;
A step of detecting, by a cutting position deviation amount detection unit, a deviation amount of a cutting position of the web to be cut by the cutting unit;
A step of performing cutting control such that the cutting position adjusting unit adjusts the cutting position of the web based on the amount of deviation of the cutting position of the web detected by the cutting position deviation amount detecting unit;
Inputting information relating to the material of the web to be printed;
With
The paper feeding unit is configured to unwind a web from one web roll out of a plurality of web rolls, and continuously switch webs from a plurality of web rolls by switching a web roll as a web unwinding source. Can be supplied,
When the web roll is switched in the paper feeding unit, the cutting control can be changed to another control method based on the information relating to the input web material. Method.

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