JP2022127813A - Web rotary printing press with paper wrinkle suppression mechanism - Google Patents

Abstract

To provide a web rotary printing press capable of eliminating an abnormality such as paper wrinkle without stopping a printing machine at the occurrence of the abnormality such as paper wrinkle or meandering of a web during conveyance.SOLUTION: There is provided a web rotary printing press having a paper wrinkle suppression mechanism for eliminating paper wrinkle, in which the paper wrinkle suppression mechanism: has a paper wrinkle detection sensor which is disposed at a place where paper wrinkle easily occurs in a web during printing; determines whether or not there is any abnormality by comparing information detected by the paper wrinkle detection sensor with information registered in advance; calculates a tension required for the abnormality occurrence place; and sets a position to be moved of a paper presser roller, thereby applying an appropriate tension to the web.SELECTED DRAWING: Figure 2

Description

The present invention reliably detects abnormalities such as paper wrinkles that occur in web paper (hereinafter referred to as "web") transported on a rotary printing press, and adjusts the tension of the web in accordance with the occurrence of paper wrinkles. The present invention relates to web-fed rotary presses with adjustable sheet cockle control.

Various printing methods such as offset printing, screen printing, letterpress printing and intaglio printing are adopted for security printed materials such as various certificates, postage stamps and stamps. By using a machine to manufacture security printed matter, it is possible to secure counterfeit resistance that is complicated and difficult to reproduce with a color copier or the like.

For example, in an offset intaglio rotary printing press (hereinafter referred to as "offset intaglio press") equipped with two methods of offset printing and intaglio printing, intaglio printing is applied immediately after offset printing, so multiple times are applied to the web. Paper wrinkles can occur when printing pressure is applied and the web is severely damaged. Furthermore, in order to form an intaglio printing image on a web after offset printing, it is necessary to dry the ink immediately after printing, so UV curable ink is sometimes used. In such a case, the ink is forcibly cured by irradiating the web immediately after printing with ultraviolet rays, so that the paper expands and contracts during curing, which may cause paper wrinkles.

As a method of suppressing paper wrinkles that occur on the web, visually check the web conveyed on the printing press, and when signs of wrinkles are confirmed, stop the printing press and forcibly smooth out the paper wrinkles. By pressing against the web using a paper pressing roller or the like, it is possible to increase the tension of the web and suppress wrinkling of the paper. However, it is difficult to visually detect signs of wrinkles that occur on the web, and in many cases, they cannot be detected until the wrinkles are completely generated. Moreover, since the paper pressure roller cannot be installed unless the printing press is stopped, there is a problem of poor work efficiency.

As another method for suppressing paper wrinkles, there is provided a web rotary printing press in which a wrinkle-removing guide roller for suppressing paper wrinkles and meandering occurring in the web can be easily mounted on the web running path. Disclosed is a web-fed web press capable of suppressing the occurrence of paper wrinkles, etc. by rotating guide rollers for removing wrinkles and adjusting the tension of the web without stopping the printing press when wrinkles or meandering is confirmed. (See Patent Document 1, for example).

JP-A-10-250034

However, the web-fed rotary printing press described in Patent Document 1 is an invention based on the premise that the confirmation of paper wrinkles and meandering occurring in the web is visually confirmed, and in order to discover even the slightest signs, Skilled technique is required. Further, there is only one type of wrinkle-removing guide roller that is replaced when paper wrinkles or meandering occurs, and it is not possible to arbitrarily set the tension according to the occurrence of paper wrinkles or the like. Therefore, it is not possible to flexibly deal with various states occurring on the web.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems. The web is equipped with a paper wrinkle prevention mechanism that can eliminate paper wrinkles by comparing the information collected from the web to check for abnormalities, calculating the tension required at the location of the abnormality, and setting the movement position of the paper pressure roller. It relates to a rotary printing press.

A web rotary printing press equipped with a paper wrinkle prevention mechanism according to the present invention includes a paper feeding unit that feeds a web, a printing unit that forms a print pattern on the web, and paper wrinkles and/or meandering that occur on the web. a paper wrinkle suppressing mechanism, a cutter unit for cutting the web to a predetermined size, and a delivery unit for stacking the cut paper, wherein the paper wrinkle suppressing mechanism is provided with the paper wrinkle suppressing mechanism. has an input unit for inputting a reference value for judging paper wrinkles and/or meandering occurring on the web, a detection unit for detecting paper wrinkles and/or meandering on the web, information detected by the detection unit, and preliminarily A calculation unit that compares the input reference values and calculates conditions for suppressing wrinkles and/or meandering of the paper, a control unit that controls the driving of the paper pressing roller based on the information calculated by the calculation unit, and a paper pressing unit. A web rotary printing press having a paper wrinkle prevention mechanism characterized by comprising at least a drive unit for driving a roller.

Further, in the web rotary printing press equipped with the paper wrinkle prevention mechanism of the present invention, the paper wrinkle prevention mechanism is characterized in that the input unit is provided with display means for displaying the occurrence of paper wrinkles and/or meandering by the detection unit. It is a web-fed rotary printing press.

In the web rotary printing press equipped with the paper wrinkle suppression mechanism of the present invention, a plurality of paper wrinkle detection sensors are installed at locations where paper wrinkles are likely to occur during web conveyance, and the state of the web being conveyed is detected at any time. By comparing and collating information registered in advance, even a slight sign of paper wrinkles can be detected, so that it is possible to reliably carry out confirmation work that requires skill.

In addition, the web rotary printing press equipped with the paper wrinkle suppression mechanism of the present invention can adjust the contact state of the paper pressing roller by arbitrary pressure according to the abnormal situation that occurs on the web, so that wrinkles and the like of the paper can be reliably prevented. The effect of being able to eliminate the anomaly of

Diagram showing an example of a web press Fig. 10 shows a state in which the paper wrinkle suppression roller is in contact with the web in the paper wrinkle suppression mechanism. Diagram showing an example of installing a paper wrinkle detection sensor A diagram showing an example of a detection state of paper wrinkles and web meandering by a paper wrinkle detection sensor. A block diagram showing an instruction system in the paper wrinkle suppression mechanism of the present invention. Flowchart diagram showing steps in the paper wrinkle prevention mechanism of the present invention

Modes for carrying out the present invention will be described with reference to the drawings, but the present invention is not limited to the modes for carrying out described below, and is within the scope of the technical idea described in the claims. Within, various other embodiments are included.

FIG. 1 shows an example of a rotary printing press (A) equipped with a paper wrinkle prevention mechanism to which the present invention is directed. The rotary printing press (A) in the present embodiment is equipped with a mechanism for producing security printed matter such as stamps and stamps. ), an intaglio printing unit (4), an intaglio UV irradiation device after intaglio printing (5), a punching unit (6), a cutter unit (7), a delivery unit (8), and an infeed unit (9). This is the printer (A).

In the rotary printing press (A) shown in FIG. 1, paper wrinkles are detected after passing through the offset UV irradiation device (3) and after passing through the intaglio UV irradiation device (5) as places where paper wrinkles are likely to occur on the web (12). The installation location and the number of installed sensors are not particularly limited.

The flow of printing using the rotary printing press (A) in this embodiment will be described. The paper feed section (1) is provided with two take-up rollers, and the web is supplied from one of the take-up rollers. is used to splice the paper to another take-up roller.

The web conveyed from the paper feeding section (1) is conveyed while being tensioned by the infeed section (9). Next, an offset printing pattern is formed in the offset printing unit (2) on the web conveyed from the paper feeding unit (1), and an offset printing pattern is formed on the web by the offset UV irradiation device (3) after the offset printing. Harden the printed pattern. At this time, since the UV ink formed on the web instantly hardens while being set on the web surface, paper wrinkles may occur due to paper shrinkage.

Next, an intaglio pattern is formed in the intaglio printing section (4) on the web surface on which the offset pattern has been cured, and the intaglio pattern is cured by an intaglio UV irradiation device (5) after the intaglio printing. Also at this time, paper wrinkles may occur in the same manner as when the offset pattern is cured. The factor is that the intaglio printing image formed on the web instantly hardens while set on the web surface, and the intaglio printing image shrinks when the web is gripped. As a result, partially different paper curls occur in the web maintained at a constant tension, causing paper wrinkles.

Next, since it is necessary to perforate the paper such as stamps and stamps, perforations are performed in the perforation section (6), and furthermore, the cutter section (7) cuts the multifaceted paper such as stamps and stamps. It is configured such that printed matter is processed into individual sheets and delivered to a delivery section (8). Therefore, as described above, the UV irradiation immediately after the offset pattern and the intaglio pattern are formed causes paper wrinkles on the web. When the symptom is confirmed, the paper pressing roller is brought into contact with the web to eliminate the paper wrinkles.

Next, the paper wrinkle suppression mechanism indicated by the dotted line in FIG. 1 will be described with reference to FIG. FIG. 2 shows an example of a paper wrinkle suppression mechanism. In the present embodiment, a paper wrinkle detection sensor (11) and a paper pressing roller (10) are provided after passing the intaglio UV irradiation device (5) after intaglio printing.

FIG. 2(a) shows a state in which no sign of paper wrinkles or wrinkles has been confirmed on the web (12). If signs of paper wrinkling are confirmed, the tension adjusted in the infeed section (9) is sufficient, and there is no need to apply excessive tension to the web (12). (10) is the state away from the web.

FIG. 2(b) shows a state in which paper wrinkles or signs of wrinkles are confirmed on the web (12). to apply any tension to the web (12). This makes it possible to correct paper wrinkles, meandering, etc. occurring in the web (12).

FIG. 3 shows the positional relationship of the paper wrinkle detection sensor (11) installed with respect to the conveyed web (12). In this embodiment, an example using a non-contact optical sensor as the paper wrinkle detection sensor (11) will be described. Any sensor may be used as long as it can detect wrinkles and the like. Also, an example in which the paper wrinkle detection sensors (11) are installed in the direction perpendicular to the conveyed web and at both ends in the width direction of the web (12) will be described. By installing the light source and the light-receiving unit at positions where specularly reflected light can be received in the vicinity of the center of the direction), the amount of specularly reflected light received at the time when paper wrinkles or signs of wrinkles occur on the surface of the web (12) is reduced. A configuration may be adopted in which paper wrinkles are detected by utilizing the change.

FIG. 4 shows a state in which an abnormality is detected by the paper wrinkle detection sensor (11) when paper wrinkles or meandering occurs in the web (12). FIG. 4(a) shows a state in which the web (12) is being conveyed normally. ) are detected, it can be determined that the web (12) itself is neither meandering nor wrinkled.

FIG. 4(b) shows a state in which the web (12) being conveyed meanders to either the left or the right with respect to the guide roller. When meandering occurs in the web (12), one paper wrinkle detection sensor (11) formed at both ends of the web (12) (left side in the figure) detects the existence of the web (12). However, the paper wrinkle detection sensor (11) on the other side (on the right side in the figure) cannot detect the presence of the web (12) and detects the guide roller, so it is possible that the paper is meandering or there is a sign of paper wrinkles. can be determined to have been detected.

As shown in FIG. 4(b), when the web (12) is meandering, it is corrected by the paper pressing roller (10). When the web (12) meanders, when the paper pressing roller (10) is brought into contact with the web (12), by increasing the contact pressure on the side where the web (12) is leaning, the web (12) Meandering can be corrected.

FIG. 4(c) shows a state in which paper wrinkles and/or meandering have occurred on the web (12). Both of the paper wrinkle detection sensors (11) formed at both ends of the web (12) cannot detect the existence of the web (12), and the surface of the guide roller is detected. can be judged to be shifting inward from the normal position.

Therefore, if the web (12) is stably conveyed, both of the paper wrinkle detection sensors (11) formed at both ends of the web (12) are When the web (12) meanders or paper wrinkles occur, one or both of the paper wrinkle detection sensors (11) do not detect the existence of the web (12), so that the web (12) can be accurately detected, including signs of wrinkled paper.

FIG. 5 shows the instruction system of the paper wrinkle suppression mechanism of the present invention. The paper wrinkle suppression mechanism in the present embodiment is provided with reference data, etc. for adjusting the contact pressure at which the paper pressure roller (10) contacts the web (12) according to the situation when paper wrinkles or meandering occurs. An input section for inputting various conditions, a detection section for detecting the state of the web (12) by the paper wrinkle detection sensor (11), the state of the web (12) detected by the detection section and a pre-input reference value. and a computing unit that calculates the optimum tension applied to the web (12) when paper wrinkles and/or meandering occurs, and based on the information obtained from the computing unit An instruction unit for instructing the movement of the paper pressing roller and transmission of information such as display on the monitor of the input unit, a control unit for controlling the movement of the paper pressing roller (10) based on the information from the instruction unit, and the control unit It is composed of a drive section having a drive motor for driving the paper pressing roller (10) based on the information of (1).

Next, each process in the paper wrinkle suppression mechanism of the present invention will be described with reference to the flow chart of FIG.

First, in STEP 1, a reference value is set for analyzing the situation when paper wrinkles occur on the web (12). Since it is necessary to input the information about paper wrinkles, meandering, etc. detected so far for each installation location, the reference value to be input here is detected after passing through the offset UV irradiation device (3) after offset printing, for example. By inputting the reference value based on the information obtained by the intaglio printing or the reference value based on the information detected after passing through the intaglio UV irradiation device (5) after the intaglio printing, it is possible to determine which part of the web (12) during transport. It can be set as a reference value that can be compared together.

Next, as STEP 2, printing by the rotary printing press (A) is started. Specifically, the web (12) is started to be transported from the paper feeding unit. After passing through the infeed section (9), the conveyed web (12) is subjected to offset printing, intaglio printing, perforation, cutting, and the like. In addition, in this flowchart, only the process of the paper wrinkle detection sensor (11) after passing the UV irradiation device (5) after intaglio printing will be described.

Next, as STEP 3, paper wrinkles and/or meandering occurring in the web (12) are evaluated. Regarding the evaluation, as explained in FIG. 4 above, whether the surface of either one or both of the webs (12) is detected by the paper wrinkle detection sensors (10) installed at both ends in the width direction of the web (12). Evaluate whether or not. At this time, it is necessary to accurately calculate the deviation amount of the web (12). Therefore, by providing a reference scale (not shown) on the guide roller, it is possible to accurately detect the deviation amount of the web (12).

If it is determined in STEP 3 that there is an abnormality, the process proceeds to STEP 4, in which an alarm is given to the printing operator and a display is made on the monitor. On the other hand, when it is determined that there is no abnormality, detection of paper wrinkles and the like is repeatedly performed until the end of printing.

Next, in STEP 5, the abnormality information detected by the detection unit is compared with a reference value that has been input in advance. Tension adjustment in STEP7 is performed by When STEP 7 ends, the process returns to STEP 3, and the detection of paper wrinkles and the like is repeatedly performed until the end of printing.

In addition, in the present embodiment, the pressing force of the paper pressure roller (10) is calculated by the calculation unit according to the occurrence of wrinkles and meandering of the paper on the web (12), and paper abnormalities are automatically corrected. As explained in the procedure, the print operator manually corrects the meandering by using the display means provided in the input unit and by displaying an alarm and/or a display on the monitor based on the abnormal information detected by the paper wrinkle detection sensor (11). It is also possible to set the adjustment method of the paper pressing roller (10), and the utilization of these methods is also within the scope of the present invention.

1 Paper feed unit 2 Offset printing unit 3 Offset UV irradiation device 4 Intaglio printing unit 5 Intaglio UV irradiation device 6 Punching unit 7 Cutter unit 8 Delivery unit 9 Infeed unit 10 Paper pressing roller 11 Wrinkle detection sensor 12 Web A Web rotary press

Claims (2)

a paper feeding unit that feeds a web, a printing unit that forms a print pattern on the web, a paper wrinkle suppression mechanism that suppresses paper wrinkles and/or meandering occurring in the web, and the web to a predetermined size. A web rotary printing press equipped with a paper wrinkle suppression mechanism having at least a cutter section for cutting and a delivery section for stacking cut paper,
The paper wrinkle suppression mechanism includes an input unit for inputting a reference value for determining paper wrinkles and/or meandering occurring in the web;
a detection unit that detects paper wrinkles and/or meandering of the web;
a calculation unit that compares the information detected by the detection unit with the reference value that is input in advance, and calculates conditions for suppressing paper wrinkles and/or meandering;
a control unit that controls driving of the paper pressing roller based on the information calculated by the calculation unit;
A web rotary printing press equipped with a paper wrinkle suppression mechanism, characterized by comprising at least a drive unit for driving the paper pressing roller. 2. A web rotary printing press according to claim 1, wherein said input unit has display means for displaying occurrence of wrinkles and/or meandering of said paper by said detection unit.

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