JP2001171908A - Method and device for control of folding registration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for controlling the folding registration allowing making an optimum setting for various situation and permitting even an unskilled operator to make setting easily. SOLUTION: The method and device for controlling the folding registration includes a phase control device 34 equipped with a phase difference calculation part 341 to calculate the phase difference given by the phase data from a printing unit side phase sensor 31 and the phase data given by a folding machine side phase sensor 32, a gain holding part 342 to hold the specified value as a gain, a correction amount calculation part 343 to calculate the correction amount from the gain held in the part 342 and the phase difference calculated by the part 341 and feed the obtained correction amount to a phase adjusting mechanism 33, a gain setting part 344 to set the value of gain to be held in the part 342, and a database 346 for gain value, and thereby the gain is varied in accordance with the operating condition of the printing machine 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a register control device and a register control method for appropriately adjusting a register for a print pattern in a continuous printing machine such as a rotary press.

[0002]

2. Description of the Related Art Conventionally, in continuous printing machines such as rotary presses,
A series of webs of printing paper are continuously fed, and while a pattern is printed on the front or back surface, the web on which the pattern is printed is appropriately cut or folded to obtain a printed material. In such a printing press, a plurality of printing units are often arranged for multi-color printing. Also, a paper feeding device for unwinding a printing paper wound in a roll shape in advance to supply the web,
A folding machine that cuts or folds the printed web is often used.

In such a printing press, the pattern of each printing unit is located at a corresponding position on the web, that is, the pattern printed by the previous printing unit and the pattern printed by the next printing unit are accurately determined. Is required. Further, it is necessary to perform a cutting process and a folding process at an appropriate position on the picture by each printing unit. For this purpose, the paper feeder, each printing unit, and the folder are driven synchronously by the same drive source, and the drive input portion of each device is synchronized so that the processing timing (printing or folding process, etc.) of each device is synchronized. Is subjected to phase adjustment and the like.

By the way, even when the above-described synchronous driving is performed, the folding processing timing (folding register) of the folding machine for the print pattern by the printing unit may be shifted. This is mainly because the amount of expansion and contraction of the web is not constant. In other words, the web passed through the printing press requires a certain tension, and the elongation due to this tension greatly varies depending on the state of the web. For example, it is known that if the web is drawn from the beginning of the roll of the paper roll, it will extend more than from the portion near the core. It is also known that webs from new rolls have a greater extension than webs from old rolls.

If the web is stretched, the printing timing of the printing unit and the folding processing timing of the folding machine are deviated even if the above-described synchronous driving is performed. Such a shift does not cause much trouble between printing units having a relatively short distance.However, in a folding machine in which a considerable distance is placed from the printing unit due to the interposition of a drying unit or the like in the middle, only that distance is used. The web growth accumulates and becomes a significant problem. In order to avoid such a problem, a folding register control device for controlling a folding register in a folding machine by adjusting a web path from a printing unit has been provided.

As such a folding register control device, a device having a printing unit-side phase detector, a folding machine-side phase detector, a phase adjusting mechanism, and a phase control device is often used. The printing unit-side phase detector detects the phase of a printing pattern on the printing unit side. Specifically, a rotary encoder or the like connected to the plate cylinder shaft of any of the printing units can be used. In this configuration, by extracting the phase from the plate cylinder corresponding to the pattern, sufficient accuracy can be ensured with a simple configuration.
Note that a device or the like that optically scans a pattern on the web surface may be used. The folder-side phase detector detects the phase of a printed picture in the folder. Specifically, a device that optically scans a picture on the web surface, such as an existing scanning head, is used.

The phase adjustment mechanism is installed immediately before the folding machine,
A path length adjusting mechanism having a predetermined adjustable web path length is used. Specifically, a roller retraction type compensator is frequently used. In this mechanism, the path length of the web is changed by changing the length of drawing the web by the roller. A roller with a high operation accuracy such as a servomotor is used for pulling in the roller.

The phase control device drives a phase adjusting mechanism in accordance with a phase difference detected by the printing unit-side phase detector and the folding machine-side phase detector, and performs feedback control using an existing computer system. What is necessary is just to comprise using a system.

In such a folding register control device, if the picture phase on the folding machine side is delayed with respect to the picture phase on the printing unit side, this delay is caused by the phase detector on the printing unit side and the phase detection on the folding machine side. The phase control device drives the phase adjusting mechanism so as to reduce the delay. In other words, the web path length in the phase adjusting mechanism is shortened so that the web reaches the folding machine side earlier, the phase on the folding machine side is advanced, and the delay is eliminated. Conversely, when the folding machine is advanced, the phase control device extends the phase adjusting mechanism, delays the web from reaching the folding machine, and eliminates the advance of the phase.

[0010]

In the above-described folding register control device, feedback control is performed by the phase control device, and the correction amount commanded to the phase adjustment mechanism is fed back to the phase difference from each detector. It was set as a value multiplied by the gain. However, there is a problem that the intended effect cannot be obtained unless the value of the gain is properly set.

For example, when the gain is set large, the correction amount for the phase difference increases. That is, a large correction is performed even with a small phase difference. In such a case, the response speed is improved, and the time until recovery from the advance or the delay can be shortened. For this reason, it is possible to quickly respond to a large change, and it is possible to reduce scraps (waste of paper, waste paper). However, there is a problem that it reacts sensitively to small fluctuations, causing hunting and becoming unstable.

Conversely, when the gain is set small, the correction amount for the phase difference becomes small, and the response speed decreases.
In such a case, the sensitivity to small fluctuations is reduced, and the stability can be increased. However, there is a problem that it takes a long time to recover a large fluctuation, and that the amount of cracks increases.

Thus, in the conventional folding register control device,
It is difficult to set the gain so as to satisfy the above contradictory conditions, and there is a secondary problem associated with the difficulty. That is, there is a problem that a skilled worker is required for gain setting, and cannot be dealt with by a general worker. Further, even if a setting that satisfies the above contradictory conditions is performed by a skilled person, this setting can be said to be a result of a compromise between the two conditions. There is a problem that the best setting cannot be obtained.

It is an object of the present invention to provide a folding register control apparatus and a folding register control method which can perform optimum setting for various situations and can easily perform setting without a skilled person.

[0015]

An apparatus according to the present invention is installed in a printing machine including a printing unit and a folding machine, and detects a phase of a print pattern on the printing unit side, and a phase detector for the folding unit. A folding machine-side phase detector for detecting the phase of a printing pattern in the machine, a phase adjusting mechanism capable of adjusting the phase of the web in the folding machine, and a detection performed by the printing unit-side phase detector and the folding machine-side phase detector. A phase control device that drives the phase adjustment mechanism in accordance with the phase difference, wherein the phase control device is configured to control the phase data from the printing unit-side phase detector and the folding machine. A phase difference calculator for calculating a phase difference from the phase data from the side phase detector; a gain holding unit for holding a predetermined value as a gain; a gain value held in the gain holding unit; A correction amount calculation unit that calculates a correction amount from the phase difference calculated by the difference calculation unit and outputs the correction amount to the phase adjustment mechanism; and a gain setting that sets a value of a gain held in the gain holding unit. And a unit.

Here, as the phase adjusting mechanism, the above-described conventional path length adjusting mechanism or the like can be used. Conventional configurations can also be used for the folder side phase detector and the printing unit side phase detector. The phase control device can be configured using an existing computer system. Each functional element of the phase control device may be virtually realized on a computer system by computer software (program), or a part or all of the functional elements may be configured by hardware. .

According to the present invention, since the feedback gain can be made variable, optimal values can be set for the above-mentioned conflicting conditions. And since you can select the optimal gain for each condition,
The operation result under each condition can be optimized. Further, since the setting of the gain value is not a fixed one, the setting operation is facilitated, and the appropriate setting can be performed even by a non-expert.

In the present invention, the phase control device has an operation state detection unit for detecting an operation state of the printing press, and the gain setting unit is configured to detect the operation state based on the operation state detected by the operation state detection unit. It is desirable that the value of the gain be set.

The operation state can be identified as a combination of various state items (parameters) relating to the printing operation. As the status items, all items related to the folding register can be set, but the status of the web (paper type, water content, roll unwinding position, etc.), the status of the printing press (print speed, print picture contents, For example, the elapsed time, the machine temperature, the dryer temperature, the start / end of the specific operation (such as the operation of the paster), and the like are included. According to the present invention, by identifying the operation state, it is possible to appropriately perform the gain setting corresponding to the current state of the printing press.

In the present invention, the phase control device has a gain value database for recording a correspondence between the operation state and an optimum gain value, and the gain setting section stores a gain corresponding to the operation state of the printing press. Is preferably obtained from the gain value database.

The gains recorded in the gain value database for each operation state include data obtained from experiments (such as setting an actual printing press in various states and adjusting to an optimum gain), empirical data of a skilled person, and statistics. What is necessary is just to set using appropriate data etc. suitably. The format of the gain value database is arbitrary, and an existing data recording format such as a function for each operation state or a data table may be appropriately used.

According to the present invention, an appropriate feedback gain can be obtained and controlled for various operating states of the printing press. In particular, since the optimum gain can be set in advance in the gain value database for each operation state, the gain setting operation can be performed with sufficient time. Further, when the operating state of the printing press changes, the corresponding gain value is read from the gain value database, and the gain can be immediately switched to an appropriate gain, so that the operation of the printing press during actual operation can be performed quickly and simply.

In the present invention, the gain setting section changes a gain setting by monitoring a control program executed by a main control device for instructing the operation of the printing press and foreseeing a change in an operation state. Is desirable. Examples of the change of the operation state include a change in paper quality by changing the web, a change in print pattern, a change in conditions such as a change in printing speed, and the start and end of a specific operation such as a paste operation. With this configuration, the gain corresponding to the change in the operating state is read in advance, and the switching can be quickly performed when the operating state is changed.

In the present invention, the change of the gain value by the gain setting unit may be a method of replacing the value held in the gain holding unit with a new gain value, or a new gain value. Thus, the value of the gain holding unit may be increased or decreased.

When the gain value is changed, the correction amount corresponding to the new gain is output from the correction amount calculation unit to the phase adjustment mechanism, and the phase adjustment mechanism changes the phase of the web. The change of the web phase may be divided into several steps to avoid a sudden change. As a method thereof, the phase adjustment mechanism may ease the operation of the drive motor or the like, or the correction amount calculation unit may gradually increase and decrease the correction amount.

Further, in changing the web phase corresponding to the correction amount in the phase adjusting mechanism, the drive motor can be decelerated or decelerated in accordance with the correction amount. The total change amount can be increased or decreased.

The method of the present invention is applied to a printing machine including a printing unit and a folding machine, and detects a phase of a printing pattern on the printing unit side and a phase of a printing pattern on the folding machine, and detects a phase on the printing unit side. Register control method for adjusting a phase of a web in a folding machine by feedback control based on a phase difference between the folding machine and a phase on a folding machine side, wherein the gain of the feedback control is controlled by an operation of a printing machine including the folding machine and a printing unit. It is characterized in that it is adjusted according to the state.

The operating state of the printing press is as described above in the description of the apparatus. In the present invention, since the feedback gain can be made variable, optimal values can be set for the above-mentioned conflicting conditions. According to the present invention, by identifying the operation state, it is possible to appropriately perform the gain setting corresponding to the current state of the printing press. Then, since the optimum gain can be selected for each condition, the operation result under each condition can be optimized, and the setting operation can be facilitated, and appropriate settings can be made even by a non-expert.

In the present invention, it is preferable that the correspondence between the operation state and the optimum gain value is recorded in advance, and the recorded gain value is taken out according to the operation state of the printing press during operation. The method of recording the correspondence between the operating state and the optimal gain value is as described in the description of the apparatus above.

According to the present invention, appropriate feedback gains can be obtained and controlled for various operating states of the printing press. In particular, prior to the operation of the printing press, an optimum gain can be set in advance for each operation state, so that the gain setting operation can be performed with a sufficient time. Further, during operation, when the operation state of the printing press changes, the corresponding gain value is read out, and the gain can be immediately switched to an appropriate gain, so that the operation of the printing press during actual operation can be performed quickly and simply.

In the present invention, during operation of the printing press,
It is desirable to monitor a control program executed by the main control device for instructing the operation of the printing press, and to change the gain setting when a change in the operation state is foreseen.

The change of the operation state includes the start and end of a specific operation such as a paste operation, in addition to a change of paper quality, a change of a print pattern, a change of a print speed and the like by changing the web. In this way, the gain corresponding to the change of the operation state is read in advance,
Switching can be performed quickly when the operating state changes.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a printing press 10 is an existing rotary printing type, and includes a printing unit 11 and a folding machine.
It has twelve. The printing unit 11 is the last stage among a plurality of printing units installed in the printing press 10. A series of webs 20 are passed through the printing press 10, and a picture 21 is printed on the front and back sides in a section up to the printing unit 11.

The printing unit 11 has an existing configuration, and includes a pair of upper and lower plate cylinders 13 arranged on both sides of the web 20 in order to print the picture 21 on the front and back of the web 20. The folding machine 12 has an existing configuration, takes in the web 20 on which the design 21 is printed, performs cutting and folding processing, and carries out the signature 20 for each design 21. For this purpose, the folding machine 12
4. It has a gripper 15 and a conveyor 16.

The printing machine 10 is provided with a drying unit (not shown) downstream of the printing unit 11 so as to perform a drying process for the ink and the like on the web 20. Further, the printing press 10
A folding register control device 30 for matching the phase of the printing unit 11 of the web 20 with the phase of the folding machine 12 is provided.

The folding register control device 30 is a printing unit-side phase detector for detecting the phase of the picture 21 in the printing unit 11.
31, a folder-side phase detector 32 for detecting the phase of the picture 21 in the folder 12, a phase adjusting mechanism 33 capable of adjusting the phase of the web 20 in the folder 12, a printing unit-side phase detector 31, A phase control device 34 that drives a phase adjustment mechanism 33 in accordance with the phase difference detected by the machine-side phase detector 32.

The printing unit side phase detector 31 detects the phase of the picture 21 in the printing unit 11. Specifically, a rotary encoder connected to the shaft of the plate cylinder 13 of any of the printing units 11 is used. In this configuration, by extracting the phase corresponding to the pattern 21 on the web 20 from the phase of the plate cylinder 13, sufficient accuracy can be secured with a simple configuration. Note that a device or the like that optically scans the pattern 21 on the surface of the web 20 may be used. Web 20
As the detection of the phase corresponding to the upper pattern 21, for example,
The passage timing of a line R (which becomes a fold line or a cutting line) that separates the 21 regions is detected.

The folder-side phase detector 32 detects the phase of a printed pattern in the folder 12. Specifically, a device that optically scans a picture on the web surface, such as an existing scanning head, is used. Folder side phase detector 32
In, as the detection of the phase corresponding to the pattern 21 on the web 20, the above-described line R that separates the pattern 21 area is detected.

The phase adjusting mechanism 33 is installed immediately before the folder 12, and uses a path length adjusting mechanism having a predetermined adjustable web path length. Specifically, a roller retractable compensator is used. In this mechanism, roller 33
The path length of the web 20 is changed by pulling the web 20 out of the normal path in step 1 and moving the roller 331 by the drive motor 333 via a transmission mechanism 332 such as a rack and pinion. As the drive motor 333, a motor with high operation accuracy such as a servo motor is used.

The phase control device 34 drives the phase adjusting mechanism 33 in accordance with the difference between the phases detected by the printing unit-side phase detector 31 and the folding machine-side phase detector 32. The phase control device 34 is configured in the control unit 18 together with the main control device 17. The main controller 17 controls the entire printing press 10 based on a predetermined printing operation program.

The control unit 18 is constituted by an existing computer system, and implements the phase control device 34 and the main control device 17 based on a predetermined software program. The control unit 18 includes an operation console
19 is connected. The operation console 19 includes a keyboard for external input, a pointing device, and a display for display.

FIG. 2 shows the details of the register control device 30, particularly the phase control device 34. The phase control device 34 calculates a phase difference from the phase data from the printing unit-side phase detector 31 and the phase data from the folder-side phase detector 32, and holds a predetermined value as a gain. And a correction amount calculation unit that calculates a correction amount from the gain held in the gain holding unit 342 and the phase difference calculated by the phase difference calculation unit 341 and outputs the correction amount to the phase adjustment mechanism 33. And a gain setting section 344 for setting the value of the gain held in the gain holding section 342.

Further, the phase control unit 34 includes an operation state detection unit 345 that fetches the operation state of the printing press 10 from the main control unit 17 and outputs the operation state to the gain setting unit 344, and a gain value corresponding to the operation state of the printing press 10. Is provided to the gain setting section 344.

As shown in FIG. 3, the gain value database
346 is a plurality of data sets 3 according to the type of the web 20 and the like.
It has 461. Each data set 3461 contains 346 data pairs
2 are recorded in large numbers. Each data pair 3462 is operating state 346
It is a combination of 3 and the gain value 3464. Therefore, if the gain setting unit 344 specifies a specific operation state, the corresponding data set 3461 is selected, and the gain value 3464 corresponding to the current state is selected therefrom, and the gain setting unit 344 is selected.
Is to be returned to.

Note that the gain value for each operation state recorded in the gain value database 346 is based on data obtained from experiments (such as setting an actual printing press in various states and adjusting to an optimum gain) and the values obtained by skilled persons. The setting is made by appropriately using empirical data, statistical data, and the like.

In this embodiment, the following operation is performed. The web 20 is sent between the printing presses 10,
The picture 21 is printed by the printing unit 11, cut and folded by the folding machine 12, and taken out as a signature 22. At this time, the web 21 is printed by the pattern 21 printed by the printing unit 11.
A virtual partition line R is set on 20. The partition line R serves as a line for cutting and folding in the folding machine 12.

The printing unit side phase detector 31 (rotary encoder) detects the phase of the web 20 from the rotation of the plate cylinder 13. For example, a seam portion of the printing plate is arranged at a predetermined position of the plate cylinder 13, and this seam corresponds to the partition line R. Therefore, when the seam portion contacts the web 20, the passage of the partition line R is detected, and a passage detection signal is transmitted at the passage timing.

The folding machine side phase detector 32 (scanning head) detects the passage of the partition line R from the picture 21. That is, although the partition line R is virtual and cannot be directly detected in some cases, the surface of the web 20 taken into the folding machine 12 is monitored, and when a predetermined distance elapses after the pattern 21 ends (the pattern 21 (Determined by the margin setting) to determine the passage of the partition line R, and sends a passage detection signal at the passage timing.

The passage detection signals from the printing unit-side phase detector 31 and the folder-side phase detector 32 are input to the phase control unit 34, respectively. In the phase controller 34, the phase difference calculator 341 measures the timing difference between the passage detection signals from the printing unit-side phase detector 31 and the folder-side phase detector 32. This time lag is a phase difference between the phase of the web 20 at the printing unit 11 and the phase of the web 20 at the folder 12.

Here, if there is no shift, the printing unit 11
The phase of the web 20 at the portion and the phase of the web 20 at the folding machine 12 match, and in this state, the folding machine 12 performs cutting and folding accurately at the partition line R.

On the other hand, when the timing of the passage detection signal from the printing unit side phase detector 31 is earlier than the timing of the passage detection signal from the folder side phase detector 32, the phase of the web 20 on the folder 12 side is changed to the printing unit. This is behind the 11 side. In such a case, a negative phase difference is output from the phase difference calculation unit 341 and the correction amount calculation unit 343 calculates a negative correction amount by multiplying the minus phase difference by the gain value held in the gain holding unit 342. I do. This correction amount is sent to the phase adjustment mechanism 33, and based on this, the drive motor 333 is driven (in the “C-” direction in FIG. 2), and the web 2
The amount of zero retraction is reduced. As a result, the web 20 in the folder 12 is advanced in phase (in the “D-” direction in FIG. 2),
The delay of the partition line R is eliminated.

On the other hand, when the timing of the passage detection signal from the printing unit-side phase detector 31 is later than the timing of the passage detection signal from the folder-side phase detector 32, the phase of the web 20 on the folder 12 side is changed to the printing unit. This means you are ahead of the 11 side. In such a case, the phase adjustment mechanism 33 is adjusted (in the “C +” direction in FIG. 2) by the reverse operation, and the phase of the web 20 in the folder 12 is delayed (in the “D +” direction in FIG. 2). ),
The advance of the partition line R is eliminated.

In the control of the folding register, the gain value held in the gain holding section 342 is appropriately changed according to the operation state of the printing press 10.

That is, it is assumed that the paper feeder (not shown) from which the web 20 has been fed out runs out, and preparations for the paster operation are started. Such control is performed by the main controller 17 of the printing press 10, and the information is provided to the gain setting unit 344 through the operation state detection unit 345.

The gain setting section 344 is for switching the gain setting according to the paster operation to the gain value database 34.
6 is retrieved, and the gain value corresponding to “after pasting” is read from the data set 3461 corresponding to the current operation state of the printing press 10. Then, when the operation state detecting unit 345 confirms that the main controller 17 has actually issued the paster command to the printing press 10, the gain setting unit 344 sets the previously called gain value in the gain holding unit 342. I do.

As a result, at the same time when the printing press 10 enters the paster operation, the feedback gain is switched to the optimum value for the paster operation, and the register control device 30 is switched to the pasteer operation corresponding mode. A similar switching operation is performed in other operation state changes and the like.

According to the present embodiment, since the feedback gain in the register control device 30 can be made variable, optimal values can be set for conflicting conditions such as responsiveness and stability. it can. Since the optimum gain can be selected for each condition, the operation result under each condition can be optimized. Furthermore, since it is not the only fixed gain value setting, the setting work becomes easy,
Appropriate settings can be made even by non-experts.

A gain setting section 344 for setting various gains reads operation state information in the main control device 17 of the printing press 10 via the operation state detection section 345 to identify the operation state. The gain setting corresponding to the current state of the printing press 10 can be appropriately performed.

In particular, the gain setting section 344 includes the main controller 17
By pre-reading the operation command program of the printing press 10 executed in the above, it is possible to prepare a gain corresponding to the change of the operation state in advance, and it is possible to quickly switch at the time of the change of the operation state .

Further, when setting the gain in the gain setting section 344, the data recorded in the gain value database 346 can be appropriately referred to. In particular, since a large number of optimal gain values for each operation state are previously stored in the gain value database 346, the gain setting operation can be performed with a sufficient time. When the operating state of the printing press changes, the gain value database
The corresponding gain value is read from 346, and can be immediately switched to an appropriate gain, so that the operation of the printing press 10 during actual operation can be performed quickly and simply.

It should be noted that the present invention is not limited to the above-described embodiment, and each component may adopt another configuration capable of obtaining each function.

[0062]

As described above, according to the present invention,
In addition to being able to make optimal settings for various situations,
It is possible to provide a folding register control device and a folding register control method that can be easily set even by a non-expert.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a phase control device of the embodiment.

FIG. 3 is a schematic diagram showing a database of the embodiment.

[Explanation of symbols]

 10 Printing machine 11 Printing unit 12 Folding machine 17 Main controller 20 Web 21 Picture 30 Folding register controller 31 Printing unit side phase detector 32 Folding machine side phase detector 33 Phase adjustment mechanism 34 Phase controller 341 Phase difference calculator 342 Gain holding unit 343 Correction amount calculation unit 344 Gain setting unit 345 Operation state detection unit 346 Gain value database

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takafumi Kawaguchi 4-5676 Hibarigaoka, Zama-shi, Kanagawa F-term (reference) 2C250 EA34 EA35 EB26 EB29 3F105 AA01 AB03 BA14 CC01 CC02 DA23 DB11 DC11 3F108 AA01 AB02 AB04 AC04 BA03 CC13 CC45

Claims (7)

[Claims] 1. A printing unit side phase detector which is installed in a printing machine including a printing unit and a folding machine and detects a phase of a printing picture on the printing unit side, and a folding machine which detects a phase of a printing picture in the folding machine. Machine-side phase detector, a phase adjusting mechanism capable of adjusting the phase of the web in the folding machine, and the phase adjustment according to a difference in phase detected by the printing unit-side phase detector and the folding machine-side phase detector. A phase control device for driving a mechanism, comprising: a phase control device, wherein the phase control device includes a phase data from the printing unit-side phase detector and a phase data from the folder-side phase detector. A phase difference calculation unit that calculates a phase difference, a gain holding unit that holds a predetermined value as a gain, a gain value held by the gain holding unit, and a phase difference calculated by the phase difference calculation unit. A correction amount calculating unit that calculates a correction amount from the correction amount and outputs the correction amount to the phase adjustment mechanism, and a gain setting unit that sets a value of a gain held in the gain holding unit. A register control device. 2. The register control device according to claim 1, wherein the phase control device includes an operation state detection unit that detects an operation state of the printing press, and the gain setting unit detects the operation state. A register value is set based on the operation state detected by the section. 3. The register control device according to claim 2, wherein the phase control device has a gain value database that records a correspondence between the operation state and an optimum gain value, and the gain setting unit includes: A register control device for extracting a gain value corresponding to an operation state of the printing press from the gain value database. 4. The register control device according to claim 1, wherein the gain setting section includes:
A register register control device which monitors a control program executed by a main control device for instructing the operation of the printing press, and predicts a change in an operation state to change a gain setting. 5. Applied to a printing machine including a printing unit and a folding machine, detecting a phase of a printing pattern on the printing unit side and a phase of a printing pattern on the folding machine, and detecting a phase on the printing unit side and a folding machine side. A folding register control method that adjusts the phase of a web in a folding machine by feedback control based on a phase difference with the phase of the folding machine, wherein the gain of the feedback control is adjusted according to the operation state of a printing machine including the folding machine and a printing unit. A folding register control method characterized by adjusting. 6. The folding register control method according to claim 5, wherein a correspondence between the operation state and an optimum gain value is recorded in advance, and the operation state is recorded according to the operation state of the printing press during operation. A register control method characterized by taking out a value of a gain. 7. A folding register control method according to claim 6, wherein a control program executed by a main control device for instructing the operation of the printing press is monitored during operation of the printing press, and the operating state of the printing press is monitored. A register control method, wherein a gain setting is changed when a change is foreseen.