JP4568738B2 - Cutting method and printing machine - Google Patents

Description

  The present invention relates to a cutting method using a folding machine used in a printing machine and a printing machine.

  A conventional multi-color printing press is configured such that a sheet unwound from a web is subjected to printing in the printing unit after the tension is adjusted in the infeed unit. As will be described later, the printing section is provided with four colors corresponding to black, indigo, red, and yellow, and these are printed in multiple colors by overlapping each color on the same sheet. It is like that. Then, the printed paper is dried by a dryer, passes through a plurality of paper cooling rolls, is cut (and sometimes folded) by a folding machine, and is carried out of the printing machine.

  As described above, the printing unit prints four colors of black, indigo, red, and yellow in the same area on the paper for each color, so it is necessary to accurately match the print positions of each color in terms of print quality. It becomes extremely important. Incidentally, this “print alignment” is generally referred to as “register”, and this term is sometimes used in this specification.

  For this reason, when performing the above multi-color printing, a special mark for measuring misregistration (hereinafter referred to as a register mark) is printed on the paper together with the original pattern, and the printed paper is printed. When a deviation from a predetermined position occurs when a registration mark is detected by a sensor, a registration correction device of a printing press is operated to adjust the registration.

  By the way, the above-described conventional printing press has the following problems. In other words, when the speed of the paper traveling through the printing press is subject to change, and this causes the paper to stretch, the conventional printing press cannot perform registration corresponding to the deviation. It is a problem. Incidentally, the case where the sheet speed is changed may be, for example, from immediately after the start of the printing press operation to the steady operation, and may be considered as an operation form or process that is essential for the operation of the printing press.

  Even if such a situation occurs, the sensor and the register correcting device should detect and correct the misregistration. However, the register correcting device involves the movement of the drive gear of the printing press. The mechanism has a structure incapable of being agile, and the misregistration cannot be corrected while changing the paper speed as described above. Therefore, conventionally, the printed matter during shifting cannot be made into a product, and as a result, they are disposed of as a disposal, which is disadvantageous in terms of operation cost.

  Such a situation has been recognized as a similar problem in the above-described folding machine. That is, in the folding machine, cutting must be performed for each unit of the image printed on the paper, but it is highly possible that cutting at an accurate position is not performed during the speed change of the paper. They were defective. Eventually, these inaccurately cut sheets were disposed of, which was also disadvantageous in terms of operational costs.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a cutting method and printing that do not dispose of paper that is printed while changing the speed of the paper. Is to provide a machine.

  The present invention takes the following means in order to solve the above problems. That is, the cutting method according to claim 1 provides an infeed portion for applying appropriate tension to the paper unwound from the winding paper so as not to cause slack inconvenience in the printing portion, and printing on the paper. Is provided with equipment in various roller forms such as an ink roller and a plate cylinder, and the apparatus is supplied with power by a motor, and the original plate attached to the plate cylinder And the paper are in contact with each other so that printing is sequentially performed, a dryer part for drying excess ink on the paper that has passed through the printing part, and the dryer part. After drying the ink, it consists of a plurality of rollers for cooling the paper that stores excessive heat to an appropriate temperature, and two rollers. Printing machine having a compensator roller that eliminates misalignment due to elongation occurring in the paper, and a folding machine that cuts the paper that has been dried and cooled to the size of one pattern printed in the printing unit In the paper cutting method, the plurality of registration marks printed on the paper are monitored during the change in the speed of the paper, and the distance between the registration marks measured with respect to the plurality of registration marks is monitored. When the deviation is determined to be greater than or equal to the range of the allowable value by comparing with a predetermined allowable value, the shift of the paper is temporarily stopped in a state where the constant speed operation is continued, and the distance between the registration marks is determined in advance. The registration deviation is corrected by controlling various rollers in the printing press so that the deviation from the predetermined initial set value is less than or equal to a predetermined value, and the absolute deviation measured with respect to the registration mark When the sheet does not exceed the allowable value range, the sheet shifting is repeated, and the sheet is cut by the folding machine while the sheet speed is changed step by step until steady operation is performed. It is characterized by this.

  According to a second aspect of the present invention, there is provided a printing machine that applies an appropriate tension to the paper that has been unwound from the winding paper, and prevents the inconvenience of sagging in the printing unit, and printing on the paper. Is provided with equipment in various roller forms such as an ink roller and a plate cylinder, and the apparatus is supplied with power by a motor, and the original plate attached to the plate cylinder And the paper, the printing unit that sequentially performs printing, and during the change of the speed of the paper, a plurality of registration marks printed on the paper are monitored, and the plurality of registration marks are monitored. When the deviation of the distance between the registration marks measured with respect to the registration marks is compared with a predetermined allowable value, and it is determined that the deviation is not less than the range of the allowable values, the operation is continued in a state where constant speed operation is continued. The shift of the paper is temporarily stopped, and the registration correction is performed by controlling various rollers in the printing press so that the deviation amount between the distance between the registration marks and a predetermined initial setting value is not more than a predetermined value. Register correction for repetitively shifting the speed of the paper when the absolute value of the deviation measured with respect to the mark does not exceed the allowable range, and gradually changing the speed of the paper to the steady operation. An apparatus, a dryer unit for drying excess ink on the paper that has passed through the printing unit, and a paper for storing excess heat after the ink is dried in the dryer unit to cool to an appropriate temperature. It has a plurality of rollers and the folding machine that cuts the paper that has been dried and cooled to a size in units of one pattern printed in the printing unit.

  According to the cutting method according to the first aspect and the printing machine according to the second aspect, the correction of the misregistration is performed after the paper shift, that is, acceleration or deceleration is temporarily stopped. Since the shift is stopped, unstable factors such as a new elongation of the paper are eliminated, and a state that can be called a “quasi-steady state” regarding printing appears. That is, in this case, it is possible to carry out normal or well-regarded preferable printing. Further, according to the present invention, the above-described stop of the shift is only “once”, and the shift operation is resumed after the registration. In short, the present invention makes it possible to perform preferable printing even during speed change. Note that this can be recognized as a similar action even on the assumption that accurate cutting is performed.

  The printing machine according to claim 3 is the printing machine according to claim 2, wherein the plurality of registration marks include a color registration mark printed for each color and a cut registration mark printed for each region. The register correcting device includes a color register correcting device provided in the printing unit and a cutting register correcting device provided in the vicinity of a folding machine for cutting the paper. The sensor and the control device related to the register correction include Each having a color register sensor, a control device for color registration correction, a cutting register sensor, and a control device for cutting register correction, and performing registration regarding the printing position of each color in the area of the paper. At the same time, registering the cutting position for each of the areas on the paper is performed.

  Each of the printing presses according to claim 3 is configured to exhibit an effective action in performing preferable multicolor printing on a sheet and in cutting at an accurate position. This is because the registration performed for the printing position of each color in the region by the color registration mark, the sensor, the correction device, and the control device related to the correction, and the cutting for each region in the same manner. It is possible to obtain two effects of registering the position at the same time.

  As described above, the cutting method according to the first aspect and the printing machine according to the second aspect temporarily stop the acceleration of the sheet when the misregistration is outside the allowable range during the speed change. This makes it possible to carry out normal or well-regarded favorable printing during the speed change, and therefore, the time when the printed paper can be set as a normal paper is set very early in the entire printing process. be able to. In other words, the generation of waste paper that has conventionally been wasted as discarding can be suppressed to a very low level, which is very advantageous in terms of operation costs.

  Further, the printing machine according to claim 3 is effective in registering the printing position of each color and registering the cutting position. That is, according to these printing machines, normal multi-color printing and accurate cutting are performed, so that the generation of waste paper that has conventionally been wasted as disposal disposal is suppressed to an extremely low level, and operation costs are advantageously brought about. Is.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a printing press according to the present invention. This printing machine has a mechanism composed of an infeed unit 3, a printing unit 4, a dryer unit 5, and a folding machine 6 that are directly or indirectly related to the printing operation itself, and operation control including color registration correction. The color registration sensor (sensor) 8, the color registration correction device 9, the control device 11 related to the color registration correction, and the control device 10 related to the printing speed, which are related devices, are schematically configured.

  The infeed unit 3 is an apparatus for applying appropriate tension to the paper 1 unwound from the web 2 so as not to cause inconvenience such as sagging in the printing unit 4 and the like that follow.

  The printing unit 4 is provided with one corresponding to each of four colors of black, indigo, red, and yellow (hereinafter referred to as a unit), each of which prints on the same paper 1. Here, printing on the same paper 1 means printing on the same area on the continuously flowing paper 1. In this way, one color is formed by superimposing the respective colors on the same region, and multicolor printing relating to the one pattern is possible. Each unit constituting the printing unit 4 includes various types of rollers such as an ink roller and a plate cylinder, and power is supplied to these various devices by a common motor 7. . As the sheet 1 advances while being in contact with the original plate attached to the plate cylinder, printing at each location is sequentially performed. Each unit is provided with a color register correcting device 9 as shown in FIG. Of course, the motor 7 may be provided separately for each color unit (that is, four independent motors), and the present invention is not particularly limited in this respect.

  The dryer unit 5 is a device for drying excess ink on the paper 1 that has passed through the printing unit 4. Further, as shown in FIG. 1, several rollers are provided between the dryer unit 5 and the folding machine 6, and the sheet 1 passes therethrough. This is provided in order to cool the paper 1 storing excessive heat to an appropriate temperature after drying. Then, the folding machine 6 cuts the paper 1 after drying and cooling into a size based on one pattern printed in the printing unit 4 (sometimes folded) to finish it as a final “product”. belongs to.

  In the present invention, the printing press having the above-described configuration performs the operation or control related to multicolor printing described below. Needless to say, the color register sensor 8, the color register correcting device 9, the control devices 10 and 11 and the like play a central role in the operation or control of the printing press. The printing machine of the present invention is configured such that operation control is performed in consideration of the color registration mark position on the paper 1 monitored by these. Also, in the present invention, it is important that the control device 11 related to the color registration correction and the control device 10 related to the printing speed are linked to each other by a transmission cable (signal transmission means) 12 (see FIG. 1). However, this will become clear in the following explanation.

  FIG. 2 is a flowchart relating to the operation or control. However, a brief description of the color register mark on the paper 1 will be given prior to the description. As shown in FIG. 3, the color register mark M is printed on a blank portion or the like in the same area (one pattern) on the paper 1 for each color unit in the printing unit 4. In the first embodiment, as can be seen from the figure, dot-like marks (M1, M2, M3, M4) representing each color are printed at a certain interval. However, in the present invention, the specific form of the color register mark M is not particularly limited to “dot”.

  The presence or absence of occurrence of misregistration is recognized by using one of these marks M1, M2, M3, and M4 as a reference, and by measuring the distance from this reference to the other three color registration marks M, Can be confirmed. It is the color registration sensor 8 that confirms the printing positions of the color registration marks M, and the color registration sensor 8 uses the control device 11 for correcting the color registration and / or the control device 10 for the printing speed. To be sent to.

  Returning to the flowchart of FIG. First, as step S1, the printing press (or control device 11) performs initial setting. That is, the distance between the color registration marks M of each color is confirmed so that multicolor printing on the paper 1 is preferable (the registration is in a registered state), and this value (hereinafter referred to as an initial setting value) is confirmed. ) And an allowable value width (usually ± 30 μm) based on the value. Note that this does not mean only a simple setting, for example, “equal so that the distances between adjacent registration marks M are all x μm”. That is, the initial setting value for the color register mark M is determined after confirming the actual printing condition on the paper 1 and should be. This is because, for the various rollers constituting each color unit, errors in machine installation and the like have a considerable influence on actual printing.

  Next, as step S2, the actual printing on the printing machine is started, and then the measurement of the color register mark M by the color register sensor 8 is started. Thereafter, measurement data from the color register sensor 8 is transmitted to the control device 11 related to the color register correction and / or the control device 10 related to the printing speed. At this point, it is an initial printing stage, and the speed of the paper 1 passing through the printing unit 4 is extremely slow. However, this speed is gradually increased thereafter. That is, acceleration is added.

  In step S3, a deviation from the initial set value of the distance between the color registration marks M is measured. Specifically, based on the measurement data of the color register sensor 8, a predetermined calculation is performed between this and the initial set value. In step S4, it is determined whether the “deviation” confirmed by the above calculation is less than or equal to the allowable value range, and in each of these cases, the following processing is performed.

  First, when it is determined that the absolute value of the deviation is greater than or equal to an allowable value during the acceleration operation, the control device 11 related to color registration correction transmits a command to stop the acceleration to the control device 10 related to the printing speed. To do. Thus, the control device 10 controls the motor 7 that drives each unit in the printing unit 4 to control the movement of various rollers in each unit so that the paper 1 operates at a constant speed. After performing this, the control device 11 related to the color registration correction repeats the correction operation such that the measured “deviation” becomes 0 and the deviation measurement by the color registration sensor 8 via the color registration correction device 9. . Then, when it is confirmed that the deviation is 0, that is, when the absolute value of the deviation does not exceed the allowable value range (as a result), as in the latter stage of step S4, The control device 11 related to the color register correction issues a command to the control device 10 related to the printing speed so as to resume the stopped acceleration operation, and the control device 10 immediately executes the command. On the other hand, if | shift | <allowable value originally during acceleration operation, the acceleration is maintained.

  As is apparent from the above description, such operation control is not performed until there is signal transmission or linkage operation (via the transmission cable) by the control device 11 related to color registration correction and the control device 10 related to printing speed. It is possible. In other words, the above-described circumstances that this is an important point in the present invention are here.

  When this step processing is completed, the process returns to step S3 to measure the deviation again, and thereafter the same operation control is performed. In this way, when the speed of the sheet 1 reaches a desired operating speed, that is, a speed expected in advance as a steady operation, the following control is performed regarding a normal registration error. In FIG. 2, as shown in the right column of step S4, if | deviation | ≧ allowable value, the correction operation and deviation measurement by the color register correcting device 9 are performed until the deviation becomes zero while continuing normal operation. Repeatedly confirming that the deviation is 0, the process returns to the deviation measurement in step S3 again. In addition, if | deviation | <allowable value, the normal operation is continued without performing any correction operation.

  FIG. 4 is a graph showing an example of the operation control described above as a relationship of the speed of the paper 1 with respect to the elapsed time. In FIG. 4, the horizontal axis represents the elapsed time, and the vertical axis represents the paper 1 speed. From the curve P in this figure, it can be seen that the speed of the paper 1 increases stepwise from the start of printing (the origin in the figure). That is, it can be clearly seen that the acceleration of the paper 1 is adjusted.

  By the way, what should be noted in this graph is the generation time of “original paper”. Here, the regular paper is a paper 1 that can be used as a product, that is, on which normal multicolor printing has been performed. In the present invention, it can be seen that this normal paper generation time starts only after a lapse of a short time from the start of printing. This is a result of acceleration adjustment relating to the paper 1. That is, by performing such operation control, it is possible to appropriately control the misregistration due to the elongation or the like of the paper 1 that cannot be avoided during the acceleration of the paper 1. Appropriate control here means that the acceleration operation is temporarily stopped when a misregistration occurs, as is apparent from the above description. More specifically, once the acceleration operation is stopped, unstable factors such as a new elongation with respect to the paper 1 are eliminated, and a state that can be called “quasi-stationary” regarding printing appears. This is because it was possible to carry out normal printing with the aim of registering while aiming for the speed at which steady operation was achieved. Note that the concept of “temporarily stopping” according to the terminology of the present invention does not only indicate a state in which acceleration is strictly stopped. For example, the present invention also includes an operation state in which the acceleration is far lower than that of the previous acceleration operation and the operation of the color register correcting device 9 (that is, the color register correcting operation) is possible. It is included in the concept of “pause once”.

  From the above, the following effects can be derived in the printing press according to the present invention. That is, improper printing has been performed until a considerable time has elapsed since the beginning of printing, and the printed paper 1 that has been disposed of is printed with proper printing and shipped as a regular product. It is an effect that can be. In other words, according to the printing press of the present invention, it is possible to achieve a significant cost reduction in terms of operation.

  This situation will be described in more detail by also showing the case of the conventional example in FIG. 4 described above. In the conventional printing machine, as described above, the registration error cannot be corrected due to a mechanical problem while the speed of the paper 1 is being changed. Therefore, conventionally, as indicated by the curve C in FIG. 4, during the speed change of the paper 1, steady operation is performed while relatively large acceleration adjustment is performed by roughly checking the misregistration by the worker. There was general operation control. It should be noted that in FIG. 4 curve C, acceleration is temporarily stopped as in curve P, but the subsequent restart of acceleration is not performed “after registration”. is there. Then, after a period of steady operation (corrected color registration), the time when the correct paper is generated is determined for the first time. Thus, it can be seen that the generation time of the regular paper in the conventional example is very late compared to that of the present invention. As a result, the generation of waste paper (opposite of the above-mentioned “regular paper”) becomes very large. In FIG. 4, the number of pieces of waste paper is recognized as being proportional to the area of the region sandwiched between the time-speed curve (curve P or curve C), the horizontal axis, and the vertical axis indicating the normal paper generation time. However, if the number of damaged paper sheets of the present invention is compared with that of the conventional example, it will be apparent that the former is remarkably reduced.

  Further, the acceleration adjustment during the paper 1 speed change in the conventional example is exclusively performed by the operator as described above. In general, in order to realize this work, a highly skilled technique is required because the measured misregistration and the allowable value are very delicate. In other words, it can be said that it is inherently extremely difficult to determine the generation time of the original paper early. On the other hand, it can be said that the significance of the present invention is extremely large considering the fact that it has been a long time since the decrease in skilled workers was screamed today.

  Below, 2nd embodiment which concerns on this invention is described. In the second embodiment, a separate control process for adjusting the acceleration of the paper 1 is added to the operation control related to the first embodiment. Therefore, in the following description, the description of what is the same as in the first embodiment, for example, the configuration of the printing machine, is omitted.

  5A and 5B are operation control flowcharts of the printing press according to the second embodiment. As can be seen from the main flowchart in FIG. 5A, Step S1 (initial setting), Step S2 (measurement start), and Step S3 (deviation measurement) are all the same as in the first embodiment. The difference is that, in step S4, when the acceleration operation is in progress and | deviation | ≧ allowable value, the acceleration operation is temporarily stopped and the acceleration operation is restarted again after the deviation is zero (b) in FIG. ) Is inserted in the control shown in the sub-flowchart.

  In FIG.5 (b) step S41, the control apparatus 10 receives the restart instruction | command of the said acceleration driving | operation. In the first embodiment, when the command is received, the motor 7 is immediately controlled to start the acceleration operation of the paper 1. In the second embodiment, as shown in step S42, a new “target value” is obtained. A large amount is introduced and shifted to the “opposite side of the expected direction of deviation” (software control). Next, in step S43, the correction operation by the color register correcting device 9 and the measurement by the color register sensor 8 are performed (control on hardware) so that the register deviation matches the target value. When it is confirmed that the registration value coincides with the target value in this way, the control device 10 relating to the printing speed resumes the acceleration of the motor 7, that is, the acceleration operation of the paper 1 in step S44, and the process shown in FIG. Returning to the deviation measurement in step S3 shown.

  As is clear from the above, in the second embodiment, the concept of “target value” and “opposite side of the expected deviation direction” plays a central role in operation control. These concepts and such control have the following implications. In other words, the direction and amount of the sheet 1 during acceleration operation and the like have already been empirically predicted through many actual printing examples. That is, if the acceleration operation is performed, it is possible to predict that the sheet 1 will be extended by, for example, a μm (a is known) in the vertical direction. Therefore, it can be seen that, in the above-described case where acceleration operation is restarted, the idea of previously offsetting the known elongation or the like as a “target value” is effective. This situation will be described in more detail with reference to FIG.

  The lower part of FIG. 6 is a graph showing the relationship of the speed of the paper 1 to the elapsed time, as in FIG. The upper part of FIG. 6 shows the relationship between the curve D indicating the change in the misregistration value with respect to the elapsed time and the set points A1, A2,. In this figure, the target value is first shifted to around +30 μm at the time immediately before acceleration before the start of printing (set point A2). This is the offset amount predicted as described above, and in this case, the plus direction is “opposite the deviation prediction direction”, and the vicinity is 30 μm. Then, the misregistration is intentionally “shifted” from the initial set value so that the misregistration matches the target value (increase in the diagram of the curve D). When the above operations are completed, the acceleration operation of the paper 1 is started. Then, the misregistration set immediately before that will naturally move back to the initial setting value. In other words, by offsetting the predicted elongation in advance, when the acceleration operation actually starts, the offset and the predicted misregistration are offset, and the range of allowable values can be used widely. In FIG. 6, the target value is shifted to the initial set value immediately before the start of the acceleration operation (set point A3).

  In the second embodiment, during the acceleration of the paper 1, the same control is performed thereafter. What has been described above is the acceleration start point in the initial printing stage, but this can also be considered in the same way at the point where the acceleration operation is temporarily stopped and restarted as described above. In other words, during the acceleration operation, when | shift | ≧ allowable value, the acceleration operation is temporarily stopped, a target value is set on the opposite side to the predicted shift direction in the next acceleration operation, and the misregistration is set to the target value. Match up and resume acceleration. It can be considered that such control is performed at set points A4,..., An-1 not shown in FIG. Although not specifically described above, it is needless to say that the target value is set within a range of an allowable value range (± 30 μm in the case of FIG. 6).

  It can be easily understood that the printing accuracy is further improved by taking the above measures. That is, in the second embodiment, in addition to the effects of the first embodiment, registration of the printed matter that becomes the regular paper is performed reliably, and a higher quality product can be provided.

  Below, 3rd embodiment which concerns on this invention is described. Unlike the color registration correction described above, the third embodiment relates to cutting registration for accurately cutting the sheet 1 in the folding machine 6 shown in FIG.

  At this time, the printer shown in FIG. 7 is used, for example, unlike the printer shown in FIG. FIG. 7 is different from FIG. 1 in that a compensator roller (cutting register correcting device) 13 is provided between the dryer unit 5 and the folding machine 6 in addition to the roller for cooling the sheet 1 described above. Different. This consists of two rollers as shown in FIG. 7, and the distance between the rollers is changed by translating the axis of one of these rollers in the radial direction of the roller. is there. By this operation, the positional deviation due to the elongation or the like generated on the paper 1 is eliminated, and the subsequent cutting in the folding machine 6 can be accurately performed for each unit of the pattern. The operation of the compensator roller 13 is based on the measurement result of the cutting register sensor 14 that monitors the cutting register mark (not shown) printed on the sheet 1 and detects the elongation of the sheet 1. The control device 15 related to the registration correction is in charge.

  In the present invention, the compensator roller 13, the cutting register sensor 14, and the operation (control or operation of the printing press) brought about by the control device 15 related to cutting register correction, if necessary, each of them corrects the color register. It is understood that the device 9, the color register sensor 8, and the control device 11 related to the color register correction are regarded as having a correspondence from an operational viewpoint.

  In other words, the action relating to the cutting register can be considered in the same flow as that in FIG. 2 when the sheet 1 in the printing press is in the acceleration operation. The initial setting relating to the cutting register mark (step S1), the cutting register sensor 14 Starts measurement related to the mark (step S2), measures the deviation of the cutting register mark (step S3), and measures the acceleration operation “pause” when | shift | ≧ allowable value, and subsequent control (step S4) Etc. are performed in exactly the same way. In other words, the control device 15 related to the cutting register correction is connected to the control device 10 related to the printing speed by the transmission cable (signal transmission means) 16 and relates to the speed and cutting position of the paper 1 while exchanging information with each other. The printing press is operated while performing registration correction (that is, adjusting the distance between the rollers of the compensator roller 13). Incidentally, it is needless to say that such cutting register correction is applicable not only to the flowchart of FIG. 2 but also to FIG. 5 in which “target value” is set.

  As a result, it is apparent that the same effect as that obtained as a result of the control relating to the color registration according to the present invention described above can be obtained for the cutting of the sheet 1 by performing the control as described above. In other words, even during the acceleration of the paper 1, accurate cutting for each pattern can be performed. Therefore, the paper 1 that has been discarded as a cutting failure in the past can be shipped as a normal paper. Cost savings can be achieved.

  Incidentally, the cutting register sensor 14 and the control device 15 related to the cutting register correction can be provided separately from the color register sensor 8 and the control device 11 related to the color register correction (see FIG. 7). In addition, since the cut register mark is generally formed (printed) differently from the color register mark M, in such a printing machine, the color register correction and the cut register correction are simultaneously performed. It will be. In addition to this, it is needless to reiterate that if the control method according to the present invention as described above is incorporated in both register corrections, more appropriate printing will be performed. Let's go.

  In the above embodiment, the description of the “acceleration” operation of the paper 1 at the time of starting the operation of the printing press, etc. has been made exclusively, but the present invention is not limited to this. That is, the present invention can be applied even when the “deceleration” operation of the paper 1 is performed, such as when the operation of the printing press is stopped. In that case, if consideration is given such as replacing “acceleration” in the flowcharts of FIGS. 2 and 5 with “deceleration” or assuming that the graphs of FIGS. 4 and 6 gradually decrease, The purpose is easily derived. It is also clear that the same effect as described above can be obtained. In short, the present invention is basically applicable to a case where the speed of the paper 1 is being changed, such as acceleration or deceleration, in other words, during the “speed change” of the paper 1.

It is explanatory drawing which shows the structure of the printing machine which concerns on this invention. It is a flowchart which shows the aspect of the operation control of the printing press which concerns on this invention. It is explanatory drawing which shows an example of the registration mark printed on a paper. 3 is a graph showing an example of operation control in accordance with the flowchart shown in FIG. FIG. 3 is a flowchart showing an aspect different from FIG. 2 of the operation control of the printing press according to the present invention, in which (a) is a main flowchart and (b) is a sub flowchart. FIG. 6 is a graph showing an example of the operation control according to the flowchart shown in FIG. 5 as a relationship of the paper speed with respect to the elapsed time, and a diagram showing a curve indicating a misregistration value for the same elapsed time and setting of a target value. is there. It is explanatory drawing which shows the structure of the printing machine used as a form different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper 2 Winding paper 3 Infeed part 4 Printing part 5 Dryer part 6 Folding machine 7 Motor 8 Color registration sensor 9 Color registration correction apparatus 10 Control apparatus concerning printing speed 11 Control apparatus concerning color registration correction 12 Transmission cable (signal transmission means) )
13 Compensator Roller (Cutting Register Correction Device)
14 Cutting register sensor 15 Control device for cutting register correction 16 Transmission cable (signal transmission means)
M Register mark P Curve showing change in paper speed with respect to elapsed time in the present invention C Curve showing change in paper speed with respect to elapsed time in the conventional example D Curve showing change in registration deviation value with respect to elapsed time A1, A2,. Set point of An target value

Claims (3)

An in-feed unit for applying appropriate tension to the paper unwound from the web, so as not to cause slack inconvenience in the printing unit;
Printing is performed on the paper, and is provided with equipment having various roller forms such as an ink roller and a plate cylinder, and the power is supplied to the equipment by a motor. The printing unit in which printing is sequentially performed by proceeding while the original plate attached to the cylinder and the paper are in contact with each other;
A dryer section for drying excess ink on the paper that has passed through the printing section;
A plurality of rollers for cooling the paper storing excessive heat to an appropriate temperature after drying the ink in the dryer section;
A compensator roller that consists of two rollers and eliminates misalignment due to elongation occurring in the paper by changing the distance between the rollers;
In the paper cutting method in a printing machine having a folding machine that cuts the paper that has been dried and cooled into a size with one pattern printed in the printing unit as a unit,
During the speed change of the paper,
Monitoring a plurality of register marks printed on the paper;
Comparing the deviation in distance between the registration marks measured for the plurality of registration marks with a predetermined tolerance;
When the deviation is determined to be greater than or equal to the allowable value range, the shift of the paper is temporarily stopped in a state where the constant speed operation is continued, and the deviation amount between the distance between the registration marks and a predetermined initial set value is obtained. Control the various rollers in the printing machine so as to be below a predetermined value, and correct the registration,
When the absolute value of the deviation measured with respect to the registration mark does not exceed the allowable value range, the shift of the paper is restarted repeatedly, and the speed of the paper is gradually changed to the steady operation. However, the cutting method of cutting the sheet by the folding machine. An in-feed unit for applying appropriate tension to the paper unwound from the web, so as not to cause slack inconvenience in the printing unit;
Printing is performed on the paper, and is provided with equipment having various roller forms such as an ink roller and a plate cylinder, and the power is supplied to the equipment by a motor. The printing unit in which printing is sequentially performed by proceeding while the original plate attached to the cylinder and the paper are in contact with each other;
During the speed change of the paper, a plurality of register marks printed on the paper are monitored, and a difference between the distances between the register marks measured for the plurality of register marks is compared with a predetermined allowable value. When the deviation is determined to be greater than or equal to the allowable value range, the shift of the paper is temporarily stopped in a state where the constant speed operation is continued, and the deviation between the distance between the registration marks and a predetermined initial set value. The registration correction is performed by controlling various rollers in the printing machine so that the amount is equal to or less than a predetermined value, and the absolute value of the deviation measured with respect to the registration mark does not exceed the allowable range. A register correcting device for repeatedly resuming the shifting of the paper, and changing the speed of the paper step by step until a steady operation;
A dryer section for drying excess ink on the paper that has passed through the printing section;
A plurality of rollers for cooling the paper storing excessive heat to an appropriate temperature after drying the ink in the dryer section;
A printing machine, comprising: a folding machine that cuts the paper after drying and cooling into a size in units of one pattern printed in the printing unit.   The plurality of register marks include a color register mark printed for each color and a cut register mark printed for each region, and the register correcting device includes a color register correcting device provided in the printing unit, and the A cutting register correcting device provided in the vicinity of the folding machine that cuts the paper, and the sensor and the control device related to the register correcting are a color register sensor, a control device related to the color register correcting, and a cutting register sensor and a cutting register correcting device, respectively. The control device according to claim 1, wherein the registration of the printing position of each color in the area of the paper is performed simultaneously with the registration of the cutting position of each area of the paper. The printing machine according to claim 2.

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