JP2003291311A - Rotary printing machine and register controlling method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a register controlling method for a rotary printing machine which can prevent generation of a brake following change of a printing speed by controlling variation of a top and bottom register in variable speed, and to provide the rotary printing machine. <P>SOLUTION: A characteristic of a register variation of a pattern printing with respective printing units 4A, 4B, 4C and 4D in changing the speed is estimated per a specific printing condition governing the register variation characteristic. A phase control characteristic among respective printing units 4A, 4B, 4C and 4D for denying slippage of the top and bottom register between the patterns printed with respective printing units 4A, 4B, 4C and 4D based on the estimated register variation characteristic is preliminarily set and stored in a data base 32. Then, a phase control characteristic according to the printing condition applied to this time printing is selected among a plurality of phase control characteristics stored in the data base 32 while the printing speed is changed, and a phase relation among plate cylinders 5 of respective printing units 4A, 4B, 4C and 4D is varied based on the selected phase control characteristic. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling misregistration between patterns printed in each printing unit in a multicolor rotary printing press having a plurality of printing units.

[0002]

2. Description of the Related Art FIG. 6 is a schematic configuration diagram for explaining a main part of a general commercial rotary offset printing press. As shown in FIG. 6, a general commercial offset rotary printing press is provided with an infeed section 3, a printing section 4, a dryer section 7, a cooling cylinder section 8 and a folding machine 9 as essential parts.

The in-feed section 3 is a continuous paper 2 starting from a roll of paper 1 supported by a reel stand (not shown).
It is a part for pulling out the paper 2 and is provided with an in-feed drag (not shown) for nipping and transporting the paper 2 and a dancer roller for appropriately controlling the tension of the paper 2. The infeed drag is connected to the main shaft 13a driven by the main motor 13,
The rotational driving force from the main motor 13 is transmitted via 3a.

In the printing section 4, four printing units 4A, 4B, 4C and 4D corresponding to the four colors of black, indigo, red and yellow are arranged in parallel along the running direction of the paper 2. Each of the printing units 4A, 4B, 4C and 4D has an ink source roller 20.
And a plurality of rollers are provided. The ink supplied from the gap between the ink source roller 20 and the ink key 19 is supplied to the plate cylinder 5 while being appropriately kneaded by an ink roller group (not shown). It is adapted to be transferred from the cylinder 5 to the sheet 2 via the blanket cylinder 6. The phase relationship of the plate cylinder 5 among the printing units 4A, 4B, 4C, 4D is set so that the patterns of the respective colors by the printing units 4A, 4B, 4C, 4D overlap in the same area on the paper 2. As described above, by overlapping the respective colors on the same region, a desired multicolor pattern is formed.

The sheet 2 that has been printed by the printing unit 4 is
After being dried by heating in the dryer section 7 in the next step, it is cooled in the cooling cylinder section 8. The dryer unit 7 is a device for drying the ink on the paper 2 that has passed through the printing unit 4, and the cooling cylinder unit 8 stores the excess heat after drying in the dryer unit 7 at an appropriate temperature. It is a device for cooling up to.

A compensator roll 15 is provided downstream of the cooling cylinder section 8. The position of the compensator roll 15 can be adjusted by a compensator drive motor 16 as shown by an arrow in the figure. The paper 2 is wrapped around the compensator roll 15,
The running length of the paper 2 from the printing unit 4 to the folding machine 9 is adjusted according to the position of the compensator roll 15.

The paper 2 which has been dried and cooled is folded by a folding machine 9
Be transferred to. The sheet 2 in the folding machine 9 is vertically folded in two through a triangular plate (not shown), and then sequentially passes through a lead-in roller and a folder drag, and a pattern printed by the saw cylinder and the folding cylinder in the printing unit 4 is used as a unit. Each of the predetermined areas is cut. The cut sheet 2 is folded by a folding roller, a chopper folding device, or the like to be formed into a desired folding tab, and is delivered to the outside as a printed product as a final product.

One of the criteria for measuring the quality of the printed matter produced in this manner is the presence or absence of misregistration of the design.
The misregistration of the picture is caused by the printing units 4A, 4B, 4C,
When a pattern of each color is printed on the paper 2 from 4D, the paper 2
The print position of the design of each color on the top and bottom of the design (paper 2
Direction of flow). In the above-mentioned conventional rotary printing press, each printing unit 4A, 4B, 4
C and 4D are respectively connected to the main shaft 13a,
The printing unit 4 is designed to rotate in synchronization with each other by input of driving force from the main motor 13.
The phase relationship of the plate cylinder 5 among A, 4B, 4C and 4D is kept constant regardless of the rotation speed. However, during the printing, the printing units 4A, 4B, 4C, 4C, 4C, 4C, 4C,
The running length of the paper 2 changes slightly between 4D, and the change of the running length changes the registration of the pattern of each color in the vertical direction.

Therefore, in the conventional rotary printing press, in each printing unit 4A, 4B, 4C, 4D, a mark (register mark) for registering is provided separately from the original pattern on the paper 2.
Print at the same position on the top and put the registration marks of each color on the folding machine 9
Mark detection sensor 10 arranged upstream of the introduction part to the
Is detected in. The detection information of the register mark detection sensor 10 is transmitted to the automatic register device 11. The automatic registration device 11 shifts the detected registration marks of the respective colors, specifically,
The deviation of the vertical position of the registration mark of another color (ink, indigo, yellow) from the registration mark of the reference color (red, for example) is measured, and the printing unit 4C is set according to the measured deviation of the registration mark of each color. As a reference, the other printing units 4A, 4
The phase control motor (not shown) provided on the plate cylinders 5 of B and 4D is controlled to correct the phase relationship of the plate cylinder 5 between the reference printing unit 4C and the other printing units 4A, 4B and 4D.

[0010]

By the way, normally, when the operation of the rotary printing press is started, adjustment such as replacement of the printing plate is performed. At this time, the printing press is operated at an adjusting speed lower than the commercial operation speed. ing. Then, after the adjustment is completed, FIG.
As shown in (a), the speed is adjusted linearly from the adjustment speed to the commercial operation speed. In the so-called shaft drive type rotary printing machine shown in FIG. 6, the printing speed can be changed by controlling the rotation speed of the main motor 13 by the printing speed control device 25.

At the time of acceleration, the above-mentioned tension fluctuation and tack amount change are large, and the misregistration of the register mark of each color (black, indigo, yellow) with respect to the register mark of the reference color (red) is also shown in FIG.
As shown in (b), it expands linearly with the acceleration. In FIG. 7B, the printing color of the printing unit 4A is black, the printing color of the printing unit 4B is indigo, and the printing unit 4C.
The print color of the print unit 4D is red, and the print color of the print unit 4D is yellow. At this time, the automatic register device 11 causes the printing units 4A, 4B, 4C, 4 to move in the direction of canceling the deviation of the register marks.
An attempt is made to correct the phase relationship of the plate cylinder 5 by controlling the D phase control motor.

However, in the conventional rotary printing press, although the automatic register device 11 is provided, the top-bottom register shift may exceed the allowable range on the printed matter during acceleration. This is because the phase control motor itself has a sufficient response performance, but the control time constant of the feedback control of the automatic register device 11 is set to a large value in order to prevent hunting. That is, when the top-bottom register shift occurs during acceleration, the top-bottom register shift speed is large, and therefore the feedback control of the automatic register device 11 cannot follow the control time constant. Therefore, as shown in FIG. 7B, the deviation amount of the top-bottom registration greatly deviates from the permissible range before the automatic registration control by the automatic registration device 11 becomes effective.

As described above, in the conventional rotary printing press, the top-bottom register cannot be effectively suppressed during the acceleration of the printing speed. For this reason, in the conventional rotary printing press, the printed matter produced during the acceleration as shown in FIG.
It was not possible to provide the quality as, and had to be treated as "waste paper" that was the target of disposal. In addition, since the amount of misregistration that occurs during acceleration is large,
Even after reaching the commercial operation speed, it took a while before the registration error was within the tolerance range, and the printed matter produced during that time had to be treated as "waste paper".

The present invention has been devised in view of the above problems, and it is possible to suppress the change of the top and bottom register at the time of gear shifting and prevent the generation of waste paper due to the change of the printing speed.
An object of the present invention is to provide a register control method for a rotary printing press and a rotary printing press.

[0015]

In a rotary printing press having a plurality of printing units, when a printing speed is changed from a first speed to a second speed different from the first speed according to a predetermined shift characteristic. The present invention suppresses the deviation of the top-bottom register between the patterns printed by the respective printing units, by using the following control method.

That is, according to the register control method (first register speed control method) of the rotary printing press of the present invention, first, the space between the patterns printed by each printing unit when the printing speed is changed in accordance with the above-mentioned predetermined shift characteristic. The characteristics of the register change of the printing cylinders are predicted, and the control characteristics of the phase between the plate cylinders of each printing unit are set in advance to cancel the deviation of the top-bottom registration between the patterns printed by each printing unit based on the predicted characteristics of the register change. Keep it. Then, during the change of the printing speed, the phase relationship between the plate cylinders of each printing unit is changed based on the preset phase control characteristic. In this way, by changing the phase relationship between the plate cylinders of each printing unit according to the phase control characteristics set according to the register change characteristics when changing the speed, it is possible to suppress the top-bottom register deviation in advance. As a result, it is possible to prevent the generation of waste paper due to the change of the printing speed.

According to another register control method (second register speed control method) of a rotary printing press of the present invention, first, printing is performed by each printing unit when the printing speed is changed according to the above-mentioned predetermined shift characteristic. Predicting the characteristics of register change between patterns for each specific printing condition that affects register change characteristics, and canceling the misalignment of top and bottom registration between pictures printed by each printing unit based on the predicted register change characteristics. The control characteristics of the phase between the plate cylinders of the printing unit are set in advance.
Then, while the printing speed is being changed, the phase control characteristics according to the printing conditions for the current printing are selected from the plurality of preset phase control characteristics, and the plate cylinder of each printing unit is selected based on the selected phase control characteristics. The phase relationship between them is changed.
In this way, by changing the phase relationship between the plate cylinders of each printing unit according to the phase control characteristics set for each specific printing condition that affects the register change characteristics, it is possible to more reliably suppress the top-bottom register deviation. As a result, it is possible to prevent the occurrence of waste paper due to the change of the printing speed.

In the above second register control method, the specific printing conditions that influence the register change characteristic include, for example, the paper type and the pattern area ratio. The change in register is caused by the change of the paper length and the amount of tack due to the tension change at the time of speed change.However, if the paper type is different, the paper extension amount due to the tension change will be different due to the difference in the physical properties, and the pattern area ratio This is because it is considered that the tack amount differs depending on the difference in the ink amount on the surface if the difference is different. The pattern area ratio may be represented by a total value of the pattern area ratios of all printing units, for example.

If there is no preset phase control characteristic corresponding to the printing condition for the present printing, the following method may be used for the prediction. That is, at least two set print conditions close to the print condition for the current printing are selected from the set print conditions for which the phase control characteristics have already been set. Then, the phase control characteristic corresponding to the selected printing condition is predicted from the phase control characteristic corresponding to the selected printing condition. For example, when the printing condition is the type of paper, the presence or absence of the coat layer is used to judge the distance from the printing condition for the current printing, and it is included in the same category (coated paper type or non-coated paper type). The phase control characteristics corresponding to unknown printing conditions are interpolated from the phase control characteristics corresponding to at least two paper types.

Further, in the above first and second register control methods, while the printing speed is being changed, the phase relationship between the plate cylinders of each printing unit is changed based on the phase control characteristics described above, and each printing is performed. It is also preferable to detect the register shift between the patterns printed by the unit and automatically correct the phase relationship between the plate cylinders in the direction in which the detected shift is canceled. In this way, while changing the phase relationship between the plate cylinders of each printing unit according to the phase control characteristics set according to the register change characteristics,
When the register shift occurs, the top-bottom register shift can be further suppressed by automatically correcting the phase relationship between the plate cylinders in the direction of canceling the shift.

In the present invention, the change of the printing speed from the first speed to the second speed may be acceleration or deceleration, and may be linear shift or shift in a complicated pattern. In particular, in the case of a linear shift at a constant rate proportional to time, it is considered that the register also changes at a constant rate proportional to time. You can predict the rate. In this case, the phase control characteristic between the plate cylinders of each printing unit may be set so that the phase changes at a constant rate in proportion to time. Then, in this case, the phase control characteristic can be obtained as follows. That is, the printing speed is changed while automatically correcting the phase relationship of each plate cylinder according to the misregistration between the patterns printed by each printing unit, and after the speed change is completed, the misregistration is within the allowable range by the automatic correction. If the value falls within the range, the phase control characteristics corresponding to the printing conditions related to the printing this time are calculated based on the phase of the plate cylinder of each printing unit before the start of shifting and the phase of the plate cylinder of each printing unit after the completion of shifting. is there.

The present invention also provides a rotary printing press capable of implementing the above register control method. That is, the rotary printing press of the present invention includes, in addition to a plurality of printing units that perform printing on the same area on the sheet and a printing speed control unit that controls the printing speed,
It is characterized in that it is provided with a storage means and a register prediction correction means. In the rotary printing press of the present invention, the printing speed control means has a function of changing the printing speed from the first speed to the second speed different from the first speed according to a predetermined shift characteristic. Then, the storage unit predicts the characteristic of the register change between the patterns printed by each printing unit when the printing speed is changed according to the above-mentioned predetermined shift characteristic, and prints by each printing unit based on the predicted register change characteristic. The control characteristics of the phase between the plate cylinders of the respective printing units for canceling the misregistration between the registered patterns are preset and stored.
In particular, when the printing speed control means changes the printing speed from the first speed to the second speed at a constant rate proportional to time, the register change rate predicts the register change rate per time in each printing unit. It is also possible to store the phase change rate of the plate cylinder per time according to the register change rate. The register prediction correction means has a function of changing the phase relationship between the plate cylinders of each printing unit according to the phase control characteristics stored in the storage means while the print speed is being changed by the print speed control means. Equipped with. By thus configuring the rotary printing press, it becomes possible to implement the first register control method.

Further, another rotary printing machine of the present invention has a plurality of printing units for printing on the same area on a sheet and a printing speed control means for controlling the printing speed, as well as a database, an input means, and a register prediction correction. It is characterized by having means. In the rotary printing press of the present invention, the printing speed control means has a function of changing the printing speed from the first speed to the second speed different from the first speed according to a predetermined shift characteristic. Then, in the database, the characteristic of the register change between the patterns printed by each printing unit when the printing speed is changed according to the above-mentioned predetermined speed change characteristic, the specific printing condition (paper type or pattern) that influences the register change characteristic is recorded. Area ratio), and preset and store the control characteristics of the phase between the plate cylinders of each printing unit to cancel the register deviation between the images printed by each printing unit based on the predicted register change characteristics. I'll do it. In particular, when the printing speed control means changes the printing speed from the first speed to the second speed at a constant rate proportional to time, the register change rate predicts the register change rate per time in each printing unit. It is also possible to store the phase change rate of the plate cylinder per time according to the register change rate. Then, the register prediction correction means selects a phase control characteristic according to the printing condition input to the input means from the plurality of phase control characteristics stored in the database, and the print speed is changed by the print speed control means. While being
It has the function of changing the phase relationship between the plate cylinders of each printing unit according to the selected phase control characteristics. By configuring the rotary printing press in this way, it becomes possible to implement the second register control method.

In each of the above rotary printing presses, an automatic register for detecting the register shift between the patterns printed by each printing unit and automatically correcting the phase relationship of each plate cylinder in the direction of canceling the detected shift. The correction means may be further provided.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of a rotary printing press according to an embodiment of the present invention. As shown in FIG. 1, the rotary printing press according to the present embodiment is different from the conventional rotary printing press shown in FIG. 6 only in the configuration of a control device.
The configuration of the printer body is the same. However, this is merely to simplify the description of the parts other than the main part of the present invention,
It does not mean that the application of the register control method of the present invention is limited only to the rotary printing press having such a configuration.

The rotary printing press according to the present embodiment is provided with a register prediction correction device 31 in addition to the conventional automatic registration device (automatic registration correction means) 11, and these automatic registration devices 11 are provided.
A register control device 30 is configured by the register prediction correction device (register prediction correction means) 31. The register prediction correction device 31 has a function of correcting the register by the feedforward control, while the automatic register device 11 corrects the register by the feedback control.

The feedforward control by the register prediction correction device 31 is specifically performed as follows. The register prediction correction device 31 receives the synchronization signal from the printing speed control device 25 and executes the feedforward control. The printing speed control device 25 controls the printing speed by controlling the rotation speed of the main motor 13. At the start of printing, the printing speed is temporarily linearly accelerated to the adjustment speed as shown in FIG. After the completion, the printing speed is accelerated again linearly from the adjustment speed to the commercial operation speed, that is, at a constant rate proportional to time. And
At the end of printing, the printing speed is linearly reduced from the commercial operation speed to the stopped state. In this embodiment, at the start of acceleration from the adjustment speed to the commercial operation speed, a synchronization signal for starting feedforward control is input from the printing speed control device 25 to the register prediction correction device 31, and after the end of acceleration, the feedforward control ends. Is input to the register prediction correction device 31 from the printing speed control device 25.

The feedforward control by the register prediction correction device 31 cancels the change in the top-bottom register of the pattern of the other color (ink, indigo, yellow) with respect to the pattern of the reference color (red) shown in FIG. 7 (b). Printing unit 4 equivalent to black, indigo, and yellow
The phase of the plate cylinders 5 of A, 4B and 4D is changed. When the acceleration of the printing speed is linear as described above, the change in the top and bottom register also becomes a linear change at a constant register change rate as shown in FIG. 7B. Therefore, the register prediction correction device 31 linearly, that is, at a constant rate proportional to time, the plate cylinder 5 of each printing unit 4A, 4B, 4D.
(The phase with respect to the plate cylinder 5 of the red printing unit 4C) is changed. Naturally, the phase change direction and the phase change rate of the plate cylinder 5 are determined by the printing units 4A, 4B, 4
The printing unit 4A, which is different for each D and corresponds to black and indigo,
4B plate cylinder 5 is a phase change to the advance side,
The phase change rate of black (printing unit 4A) is set to be higher than that of indigo (printing unit 4B). On the other hand, regarding the plate cylinder 5 of the printing unit 4D corresponding to yellow, the phase is changed to the retard side. Here, the plate cylinder 5 of the printing unit 4C for the third color is used as a reference, but it goes without saying that the plate cylinder 5 of any of the other printing units 4A, 4B, and 4D may be used as a reference.

By the way, in the process of creating the present invention, it has been clarified that even if the speed is changed at the same acceleration, the change characteristics of the top and bottom register are different if a certain specific printing condition is changed. An example of this specific printing condition is the paper type and the pattern area ratio. If the paper type is different, the amount of expansion of the paper due to the tension fluctuation during acceleration will differ due to the difference in physical properties,
It is considered that there is a difference in the change in top and bottom register. Further, if the pattern area ratio is different, the tack amount that the paper 2 sticks to the blanket cylinder 6 is different due to the difference in the amount of ink on the surface, and it is considered that there is also a difference in the change of the top and bottom register. Fig. 4 shows the other colors (indigo,
Red, yellow) change in top and bottom register (final change at the end of acceleration)
It shows the result of examining the relationship between the image area ratio and the pattern area ratio by a test. Usually, the pattern area ratio is calculated for each ink key zone in the width direction in order to correspond to the ink supply amount, and when the sum of these data for all colors is used as a parameter, as shown in FIG. A nearly linear relationship can be obtained with respect to the amount of top-bottom register change.

Since the change characteristics of the top and bottom register are different when the paper type and the pattern area ratio are different as described above, in order to suppress the register change in advance by the feed-forward control, it is necessary to change according to the paper type and the pattern area ratio. It is necessary to change the control characteristics of the phase between the plate cylinders 5. Therefore, in the present embodiment, the database 32 is provided in the register control device 30, and the inclination (phase change per time) when the phase of the plate cylinder 5 of each printing unit 4A, 4B, 4D is changed in proportion to time. The ratio) is stored as a phase control coefficient (phase control characteristic) in the database 32 for each paper type and each pattern area ratio. In particular,
The relationship between the total value of the pattern area ratios of all colors and the register change amount of each color can be represented by a map (or a mathematical expression) as shown in FIG. 4, so that the total value of the pattern area ratios of all colors and the phase control coefficient The relationship of can also be expressed by a map (or a mathematical expression). The database 32 stores a map (or mathematical expression) showing the relationship between the total value of the pattern area ratios of all colors (hereinafter referred to as the total pattern area ratio) and the phase control coefficient for each paper type.

The register prediction correction device 31 uses the input unit 34 to print conditions (print type, total picture area ratio) for printing this time.
When the information regarding the print condition is input, the database 32 is searched using the input print condition information as a search condition, and the phase control corresponding to the print condition related to the current printing is selected from the plurality of phase control coefficients stored in the database 32. It is designed to select the coefficient. Specifically, the map (or mathematical expression) corresponding to the input paper type is selected, and the total pattern area ratio input to the selected map (or mathematical expression) is collated to correspond to the printing condition of this time. Calculate the phase control coefficient. Then, according to the selected phase control coefficient, as shown in FIG.
Register correction signal as shown in (a) (corresponding to FF correction amount)
Is output to a phase control motor (not shown) that controls the phase of the plate cylinder 5 of each printing unit 4A, 4B, 4D. The printing conditions (paper type, total pattern area ratio) may be manually input by the operator or may be automatically input online from the upstream plate making process.

On the other hand, the automatic register correcting device 11 cancels the register change by feedback control when the top and bottom register of the pattern of the other color (ink, indigo, yellow) deviates from the pattern of the reference color (red). A pulse-shaped register correction signal (corresponding to the FB correction amount) as shown in FIG. 2B is output in the direction. The register correction signal (FB correction amount) output from the automatic register correction device 11 and the register correction signal (FF correction amount) output from the register prediction correction device 31 are as shown in FIG. Is input to a phase control motor (not shown) that controls the phase of the plate cylinder 5 of each printing unit 4A, 4B, 4D.

FIG. 2 is a diagram showing a case where the correction speed (register correction speed) of the phase control motor is variable, but when the register correction speed of the phase control motor is constant, the register prediction is performed. The register correction signal output by the correction device 31 is as shown in FIG. Here, FIG. 3A is a diagram showing the relationship between the register correction signal (corresponding to the FF correction amount) and the acceleration time by the feedforward control when the register correction speed is variable, and L1 and L2 in FIG. Indicate register correction signals corresponding to different phase control coefficients. Figure 3
(B) and FIG. 3 (c) are L1 and L2 shown in FIG. 3 (a).
3 shows the relationship between the register correction signal (corresponding to the FF correction amount) by the feedforward control and the acceleration time when the correction speed is constant. These FIG. 3 (b) and FIG.
As shown in (c), when the register correction speed is constant, the predictive correction is an intermittent correction, and as the phase control coefficient increases, pulse signals are output at shorter intervals. In this case, when the register correction signal from the automatic register correction device 11 overlaps with the register correction signal from the register prediction correction device 31, the same arithmetic processing as that shown in FIG. 2 is performed,
This can be dealt with by changing the modification time.

Therefore, in the rotary printing press according to the present embodiment, during acceleration from the adjustment speed to the commercial operation speed,
Each printing unit 4A, 4 with respect to the reference printing unit 4C
The phases of the plate cylinders 5 of B and 4D are changed at a constant rate according to the printing conditions (paper type, total pattern area ratio) in the direction of canceling the change of the top and bottom register. In addition, due to changes in operating conditions, changes in the phase of the plate cylinder 5 cannot keep up with changes in the register, or conversely, changes in the phase of the plate cylinder 5 are too large and the register changes in the opposite direction. In the case of occurrence of, by the feedback control by the automatic register correcting device 11,
The phase of the plate cylinder 5 is corrected in the direction of canceling the top-bottom registration error.

As a result, according to the rotary printing press of the present embodiment, it is possible to suppress the deviation of the top and bottom register during the acceleration from the adjustment speed to the business operation speed, and as shown in FIG. The printed matter produced during the period of acceleration to the operating speed can also be provided with the quality as plain paper. That is, the rotary printing press according to the present embodiment can reduce the production cost by suppressing the generation of waste paper due to the acceleration.

If the printing condition for this printing is a new condition and the corresponding data (phase control coefficient) does not exist in the database 32, the following processing is performed. For example, when a paper of an unknown paper type comes in, the known paper type closest to the paper type including the basis weight is selected. Then, the relationship between the total pattern area ratio and the phase control coefficient for the selected known paper type is used to set the phase control coefficient according to the total pattern area ratio for the current printing. Alternatively,
Since the physical properties of paper greatly differ depending on the presence or absence of the coat layer, the categories are divided according to the presence or absence of the coat layer (coated paper or non-coated paper), and at least two known paper types are selected from the categories to which the unknown paper type belongs. Select. And
Using the relationship between the total pattern area ratio and the phase control coefficient for at least two known paper types selected, the phase control coefficient according to the total pattern area ratio for the current printing is interpolated.

Next, the value (average value) of the potentiometer of the phase control motor immediately before acceleration and the printing speed (plate cylinder rotation speed) or speed average value at that time are stored. Then, during the acceleration from the adjustment speed to the commercial operation speed, a register correction signal corresponding to the interpolated phase control coefficient is output to the phase control motor so that the phase of each plate cylinder 5 cancels the change in the top-bottom register. Change at a constant rate. After the acceleration, when the register change reaches the stable region (within the allowable range) by the feedback control by the automatic register device 11, the value (average value) of the potentiometer of the phase control motor and the printing at that time are performed again. Speed (plate cylinder rotation speed)
Alternatively, the average speed value and the average speed value are stored. Then, the potentiometer value change amount / speed change time is calculated from the potentiometer value, the printing speed, and the acceleration rate value at two points before and after acceleration, and the calculated value is calculated as It is stored in the database 32 as a phase control coefficient corresponding to the printing condition of. From the next time, the newly stored data can be used as the phase control coefficient corresponding to the printing condition.

Further, the phase control coefficient can be calculated from the deviation of the register mark on the printing paper surface without using the value of the potentiometer. Specifically, both the automatic register control device 11 and the register prediction correction device 31 are turned off (however, only the register mark deviation amount detection section of the automatic register control device 11 is activated), before acceleration starts, and acceleration ends. Register mark detection sensor 1 for the position of the register mark of each color after
Detected by 0. Then, based on the amount of deviation in the vertical direction position of the register mark of the other color (ink, indigo, yellow) with respect to the register mark of the reference color (red), the printing units 4A, 4B,
The phase control coefficient corresponding to 4D is calculated (the average of the correction signal values output by the register mark detection sensor 10 after reaching the stable region after acceleration may be taken). In this case, since the register control during acceleration is not performed, the printed matter produced during acceleration is treated as spoiled paper.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the feedback control by the automatic register control device 11 may be stopped during acceleration, and only the feedforward control by the register prediction correction device 31 may be performed.

The application of the present invention is not limited to the register control during acceleration as in the above-described embodiment. In the case shown in FIG. 5, the register control of the present invention can be applied even during deceleration from the printing speed to the stop. Further, the present invention can be applied not only to a shift at a constant rate of change as shown in FIG. 5, but also to a shift with a more complicated shift pattern (shift characteristic). In other words, even if the shift pattern is complicated, the pattern of register change (register change characteristic) at that time is the same if the pattern is the same, so the phase of the plate cylinder of each printing unit is based on the register change pattern. By setting the control characteristics, it becomes possible to cancel the top-bottom register deviation between the patterns printed by each printing unit.

Further, the rotary printing machine to which the present invention is applied is not limited to the one having the configuration of the above embodiment. For example, the invention can be applied to a rotary printing machine including a plurality of printing units. Further, it can be applied to a so-called shaftless type (individual drive type) rotary printing machine in which a drive motor is provided for each printing unit without providing a main shaft.

[0042]

As described in detail above, according to the first register control method of the present invention and the rotary printing press using the method,
While changing the printing speed, by changing the phase relationship between the plate cylinders of each printing unit in accordance with the phase control characteristics set according to the register change characteristics at the time of shifting, the pattern printed by each printing unit There is an advantage that it is possible to prevent the misalignment of the top and bottom registration in advance, and as a result, it is possible to prevent the occurrence of waste paper due to the change of the printing speed.

Further, according to the second register control method of the present invention and the rotary printing press using the method, the setting is made for each specific printing condition which influences the register change characteristic at the time of shifting while the printing speed is being changed. By changing the phase relationship between the plate cylinders of each printing unit according to the phase control characteristics, it is possible to more reliably suppress the misalignment of top and bottom registration between the patterns printed by each printing unit, and as a result, There is an advantage that spoiled paper can be prevented from occurring due to a change in printing speed.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a rotary printing press according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the content of register control by the rotary printing press in FIG. 1, and FIG. 2A is a diagram showing a relationship between register correction amount (FF correction amount) by feedforward control and acceleration time; (B) is a figure which shows the relationship between the register correction amount (FB correction amount) and acceleration time by feedback control, and (c) is a figure which shows the relationship between the total register correction amount and acceleration time.

FIG. 3 is a diagram for explaining the content of register control by the rotary printing press of FIG. 1 in relation to FIG. 2, and FIG. 3 (a) is register correction by feed-forward control when the register correction speed is variable. It is a figure which shows the relationship between the amount (FF correction amount) and acceleration time, (b), (c) is L1, L shown in (a).
FIG. 6 is a diagram showing a relationship between register correction amount (FF correction amount) and acceleration time by feedforward control when the correction speed is constant for No. 2;

FIG. 4 is a diagram showing a relationship between a pattern area ratio and a register change amount.

5 is a diagram showing a time chart of printing speed control in the rotary printing press of FIG. 1 together with a production area of original paper.

FIG. 6 is a schematic diagram showing a configuration of a conventional rotary printing press.

FIG. 7 is a diagram for explaining a problem in a conventional rotary printing press, (a) is a diagram showing a speed change from an adjustment speed to a commercial operation speed, and (b) is a reference under the condition of (a). It is a figure which shows the register change of another color (ink, indigo, yellow) with respect to a color (red).

FIG. 8 is a diagram showing a time chart of printing speed control in a conventional rotary printing press together with a production area of plain paper.

[Explanation of symbols]

1 roll paper 2 sheets 3 Infeed section 4 Printing department 4A printing unit (black) 4B printing unit (indigo) 4C printing unit (red) 4D printing unit (yellow) 5 plate body 6 blanket body 7 Dryer part 8 Cooling cylinder section 9 folding machines 10 Register mark detection sensor 11 Automatic registration device 13 Main motor 13a Main shaft 15 Compensator Roll 16 Compensator drive motor 19 ink key 20 Ink source roller 25 Printing speed controller 30 Register control device 31 Register prediction correction device 32 databases 33 adder 34 Input section

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichiro Senoo             Hiroshima Prefecture Mihara City Itozakicho 5007 Mitsubishi Heavy Industries             Paper and printing machinery division (72) Inventor Yoshitaka Hamamoto             Hiroshima Prefecture Mihara City Itozakicho 5007 Mitsubishi Heavy Industries             Paper and printing machinery division F-term (reference) 2C034 AA10 AA42 AC01                 2C250 EA06 EA34 EA42 EB33 EB34

Claims (11)

[Claims] 1. A printing unit in a rotary printing press having a plurality of printing units, wherein the printing speed is changed from a first speed to a second speed different from the first speed according to a predetermined shift characteristic. Is a method for controlling the register shift between the patterns printed by the above, and predicts the characteristic of the register change between the patterns printed by each of the printing units when the printing speed is changed according to the shift characteristic, and Based on the register change characteristics, the phase control characteristics between the plate cylinders of the respective printing units for canceling the register deviation between the patterns printed by the respective printing units are set in advance, and while changing the printing speed, Characterized in that the phase relationship between the plate cylinders of each printing unit is changed according to a preset phase control characteristic,
Register control method for rotary printing press. 2. Each of the printing units when changing the printing speed in a rotary printing press having a plurality of printing units from a first speed to a second speed different from the first speed according to a predetermined shift characteristic. Is a method of controlling the register shift between the patterns printed by the above, wherein the characteristic of the register change between the patterns printed by each of the printing units when the printing speed is changed according to the shift characteristic is the register change characteristic. The control of the phase between the plate cylinders of the printing units for canceling the register shift between the patterns printed by the printing units based on the predicted register change characteristics Set the characteristics in advance and, while changing the printing speed, select the phase control characteristics according to the printing conditions for this printing from among the preset phase control characteristics. Wherein the gradually changing the phase relationship between the plate cylinder of each printing unit in accordance with the selected phase control characteristic, register control method of a rotary printing press. 3. The register control method for a rotary printing press according to claim 2, wherein the printing condition includes a paper type of the paper. 4. The register control method for a rotary printing press according to claim 2, wherein the printing condition includes a pattern area ratio. 5. If a plurality of preset phase control characteristics does not correspond to a printing condition related to printing this time, the phase control characteristic is set to the current one from among the already set printing conditions. A feature is that at least two set print conditions close to the print condition related to printing are selected, and the phase control property corresponding to the print condition related to this printing is interpolated from the phase control property corresponding to the selected set print condition. The register control method of the rotary printing press according to any one of claims 2 to 4. 6. While changing the printing speed, while changing the phase relationship between the plate cylinders of each of the printing units according to the phase control characteristics, further, the misregistration between the patterns printed by each of the printing units. Is detected, and the phase relationship is automatically corrected in a direction in which the detected deviation is canceled, and the register control method for a rotary printing press according to claim 1. 7. The change of the printing speed from the first speed to the second speed is speed change at a constant rate proportional to time, and the register change characteristic is a change in register per time in each of the printing units. The register control method for a rotary printing press according to claim 1, wherein the rate is predicted. 8. The automatic correction of the phase relationship according to the misregistration between the patterns printed by each of the printing units, at a constant rate proportional to time from the first speed to the second speed. The printing speed is changed, and the phase control characteristic is calculated based on the phase of the plate cylinder of each of the printing units before the start of the shift and the phase of the plate cylinder of each of the printing units after the end of the shift. Item 7. A register control method for a rotary printing press according to Item 7. 9. A plurality of printing units for printing on the same area on a sheet, and a printing speed for changing the printing speed from a first speed to a second speed different from the first speed according to a predetermined shift characteristic. The control means and the characteristic of the register change between the patterns printed by the printing units when the printing speed is changed according to the shift characteristic are predicted, and the printing unit prints based on the predicted register change characteristic. Storage means for presetting and storing the control characteristics of the phase between the plate cylinders of the printing units for canceling the misregistration between the patterns, and while the printing speed is being changed by the printing speed control means, Rotary printing, which comprises register prediction correction means for changing the phase relationship between the plate cylinders of each printing unit in accordance with the phase control characteristics stored in the storage means. Machine. 10. A plurality of printing units for printing on the same area on a sheet, and a printing speed for changing the printing speed from a first speed to a second speed different from the first speed according to a predetermined shift characteristic. The control means and the characteristic of register change between pictures printed by each of the printing units when the printing speed is changed according to the shift characteristic are predicted for each specific printing condition that influences the register change characteristic, and the prediction is performed. The database for presetting and storing the control characteristics of the phase between the plate cylinders of the printing units for canceling the register shift between the patterns printed by the printing units based on the registered change characteristics, Input means for inputting the printing conditions according to the above, and a phase corresponding to the printing conditions input to the input means from the plurality of phase control characteristics stored in the database. A register predicting / correcting means for changing the phase relationship between the plate cylinders of the printing units according to the selected phase control characteristics while the printing speed is being changed by the printing speed control means by selecting the control characteristics. A rotary printing press, which is equipped with 11. An automatic register correcting means is further provided for detecting a register shift between patterns printed by the respective printing units and automatically correcting the phase relationship in a direction of canceling the detected shift. The rotary printing press according to claim 9 or 10.