JP2842121B2 - Preset device of register control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preset device for automatically adjusting a register control device for preventing color misregistration of a multicolor printing press when the plate cylinder is installed.

[0002]

2. Description of the Related Art When performing overprinting on a web such as paper or film using a plurality of plate cylinders, a color shift occurs unless each color is printed at a predetermined position. Therefore, a register mark for each color is provided on the print target (web), and printing is controlled based on the register mark.

[0005] As an example of detecting the register mark position, an example of printing on paper by a gravure rotary printing press shown in FIG. 5 will be described. The order of printing by the plate cylinder 2 is arbitrary, but when printing on normal paper, the first color is yellow, the second color is red, the third color is blue, the fourth color is black, and when printing on film, Often this order is reversed. The web 16 unwound from the unwinding reel 1 is a yellow plate cylinder 2a and a red plate cylinder 2a.
b, yellow, red, blue, and black are sequentially printed by sequentially passing through a printing unit including a blue plate cylinder 2c and a black plate cylinder 2d, and a series of printing is completed. The perimeter of each plate cylinder 2a, 2b, 2c, 2d in the printing unit has the same dimension, one leaf is printed for each rotation of the plate cylinder, and the web 16 passing through the printing unit has the perimeter of the plate cylinder. A pattern as one unit is repeatedly printed.

The rotational misalignment of these four plate cylinders and the web 16
When register control for preventing color misregistration due to elongation or the like is performed, each plate cylinder 2 prints a register mark as shown in FIG. In other words, the yellow register mark is printed in its own color, such as the yellow plate cylinder 2a, and the red register mark is printed in its own color, such as the red plate cylinder 2b.

FIGS. 8A and 8B show a detection state of the register mark by the scanning head 8, wherein FIG. 8A shows a state in which the color is correctly printed without color shift, and FIG. 8B shows a state in which the blue register mark is shifted to the red register mark side. This shows a state where the d-shift is performed, and a case where the blue pattern is also d-shifted to the red side is shown. In other words, by monitoring the relative positions between the register marks, the shift of the picture of each color can be found, and when such a shift occurs, the compensator roll 5 shown in FIG. 5 is operated, and control is performed to eliminate the shift.

As described above, one plate cylinder 2 can print only one color of one picture. For this reason, it is necessary to replace the plate cylinder 2 every time a different pattern is to be printed in a certain color and another size. When the plate cylinders 2 are exchanged, the phases of the plate cylinders 2 are adjusted to some extent, the path length between the printing points of the adjacent plate cylinders 2 is set to be an integral multiple of the circumference of the plate cylinder 2, It is necessary to make an initial setting so that the deviation of the relative position is within a certain range. Since the register mark is printed for each circumference of the plate cylinder 2, a gate position signal is given to the scanning head 8 when the register mark passes, and when the gate position signal is output, the register mark can be detected. You need to do that. Therefore, it is necessary to initialize the register mark so that the gate position signal is output when the register mark passes through the scanning head 8.

In order to make such initial settings, each plate cylinder 2
Since it takes considerable skill to accurately set the position with respect to a predetermined reference and to set the gate position, various kinds of automation of these initial settings have been performed. JP-A-1-9
No. 9845 and JP-A-1-99846 disclose such a technique. According to this, it is necessary to set the plate cylinder to the reference position, and thereafter, the position of the compensator roll and the timing of generating the gate position signal are calculated based on the reference position, and these presets are automatically performed.

[0008]

However, in the technique disclosed in the above publication, there is a work in which an operator sets the plate cylinder at a reference position. Had become.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a preset device of a register control device for automatically performing initial register setting and initial gate position setting for a plate cylinder set without requiring accuracy is provided. The purpose is to provide.

[0010]

In order to achieve the above object, a first aspect of the present invention is to detect registration marks of a plurality of plate cylinders printed on a running web by a scanning head using a gate position signal set in advance. In a preset device of a register control device for adjusting the register adjustment mark to be printed at a predetermined interval, a detection head provided for each plate cylinder and detecting a reference position of each plate cylinder, and rotating at the same rotation speed. A rotation amount detecting means for detecting a rotation amount of the plate cylinder, and a storage unit for storing data including a diameter of the plate cylinder, a diameter of the impression cylinder, a position of the detection head, and a path length between printing points of the corresponding plate cylinder. ,
A phase correction means for correcting the phase difference between the corresponding plate cylinder, for said detection head provided in the corresponding plate cylinder, whereas <br/> detection head and the other detection head than when outputting the detection value A phase difference of the corresponding plate cylinder is obtained from the rotation amount of the rotation amount detecting means until the detection value is output, and a correction position such that the register adjustment mark is printed at a predetermined interval based on the data in the storage unit. The apparatus further includes a preset control unit that calculates a phase difference and outputs the result to the phase correction unit.

According to a second aspect of the present invention, a registration head of a plurality of plate cylinders printed on a running web is detected by a scanning head using a gate position signal set in advance.
In a preset device of a register control device for adjusting the position of a compensator roller arranged between each plate cylinder so that the register adjustment marks are printed at predetermined intervals, a reference position of each plate cylinder provided for each plate cylinder is set. A detection head for detecting,
Rotation amount detecting means for detecting the amount of rotation of each plate cylinder rotating at the same number of rotations, the diameter of the plate cylinder, the diameter of the impression cylinder, the position of the detection head, the path length between the printing points of the corresponding plate cylinder and its A storage unit for storing data including the position of the compensator roll at the time of the path length, and, for the detection heads provided on the corresponding plate cylinders, when one of the detection heads outputs a detection value.
The phase difference of the corresponding plate cylinder is obtained from the rotation amount of the rotation amount detecting means until the other detection head outputs the detection value, and the register adjustment marks are printed at predetermined intervals based on the data of the storage unit. And a preset control unit that calculates the amount of movement of the compensator roll and outputs the calculated amount to the register control device.

[0012]

According to a third aspect of the present invention, the storage section also stores a path length between the scanning point corresponding to the printing point of the plate cylinder and the scanning head.
After the preset control unit detects the register adjustment mark printing unit by the downstream detection head based on the data in the storage unit, until the corresponding scanning head generates a gate position signal for detecting the register adjustment mark. The rotation amount of the rotation amount detecting means is calculated.

[0014]

First, the first invention will be described. For detection head provided in the corresponding plate cylinder, the rotation amount of between from the detection of the reference position of the detection head is a plate cylinder of one side to the detection head on the other side to detect the reference position of the plate cylinder The phase difference of the corresponding plate cylinder is determined by the amount of rotation of the detecting means. The radius r of the plate cylinder is obtained from the data in the storage unit, the radius is multiplied by the phase difference to make the phase difference a length, and the value obtained by adding this length and the path length between the printing points of the plate cylinder is l. . When the size of the plate cylinder is exchanged, the printing point of the plate cylinder rises and falls, and accordingly the impression cylinder also rises and falls, so that the contact angle of the impression cylinder and the contact angle of the guide roll 4 before and after the impression cylinder also change. When the impression cylinder is replaced, the contact angle between the impression cylinder and the guide rolls before and after the impression cylinder also changes. Therefore, the path length between the printing points of the plate cylinder differs for each combination of the plate cylinder size and the impression cylinder size. Referring to FIG. 2, if this l is equal to an integral multiple nL of the circumference L of the plate cylinder as shown in FIG. 2A, the register adjustment marks printed by the upstream plate cylinder and the downstream plate cylinder are at predetermined intervals. Become. The point A is set as the reference position of the plate cylinder, and the register adjustment mark printing unit may be used as the reference position. If l <nL, rθ = nL−1 is obtained as shown in (b), and the downstream plate cylinder is shifted counterclockwise by the corrected phase difference θ with respect to the upstream plate cylinder. In this way, the state shown by the broken line is the same as the state shown in FIG. It is assumed that the plate cylinder rotates clockwise. Also, l> n
In the case of L, rθ = 1−nL is obtained as shown in FIG.
When the downstream plate cylinder is shifted clockwise by the correction phase difference θ with respect to the upstream plate cylinder, the position shown by the broken line is in the same state as (a). By shifting the correction phase difference θ by the phase correction means in this way, the register adjustment marks printed on the upstream and downstream plate cylinders have a predetermined interval. In the above description, the predetermined interval d between the register adjustment marks has been described as 0. However, when d ≠ 0, the phase difference may be calculated in consideration of this d. The same applies to the following description.

Next, the second invention will be described. In the present invention, the phase difference of the plate cylinder corresponding to the first invention is corrected by the phase correcting means, whereas in the second invention, the path length between the plate cylinders is adjusted by a compensator roll. Similarly to the first invention, the phase difference α of the corresponding plate cylinder is obtained, the phase difference is multiplied by the radius r of the plate cylinder to obtain the phase difference rα, and this rα and the printing point of the plate cylinder at the current compensator roll position are obtained. Let l be the length obtained by adding the path length l ₀ . The modification of the path length when the diameter of the plate cylinder is changed and when the diameter of the impression cylinder is changed is the same as in the first invention. By adding rα to l ₀ ,
As shown in FIG. 3A, the upstream and downstream plate cylinders have the same phase. Here, the point A is set as the reference position of the plate cylinder, and this reference position may be set as the register adjustment mark printing unit. The plate cylinder shall rotate clockwise. Then, as shown in (a), if l is equal to an integer multiple nL of the circumference L of the plate cylinder, the register adjustment marks printed on the upstream and downstream plate cylinders have a predetermined interval. As shown in (b), when l <nL, the position of the compensator roll is set so that a value obtained by adding Δ = nL−1 to l becomes nl. Also, as shown in (c), when l> nL, the position of the compensator roll is set so that a value obtained by subtracting Δ = l−nL from 1 becomes nL. With this setting, the register adjustment marks printed on both the upstream and downstream plate cylinders have a predetermined interval.

[0016]

Next, the gate position setting will be described with reference to FIG. The path length PS between the scanning head corresponding to the plate cylinder radius r, the position of the detection head, and the printing point P of the plate cylinder is determined from the data in the storage unit. The detection head is set at the position of the path length PQ from the point P, that is, at the position where the plate cylinder has rotated θ1. When the plate cylinder rotates by .theta.1, the register adjustment mark printed at point P moves to point Q 'as path PQ = path PQ'. Since the path Q'S = the path PS-the path PQ, the register adjustment mark passes through the scanning head position S after the detection head detects the register adjustment mark printing portion of the plate cylinder as the path Q'S = the path QS '. θ2 rotation,
θ2 is obtained by the following equation. θ2 = (pass PS−pass PQ) / r Therefore, if the gate position signal is set based on the time when the rotation amount detecting means detects the rotation amount θ2 after the detection head detects the register adjustment mark printing portion of the plate cylinder, Good.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention. The web 16 unwound from the paper feed roll 1 is printed by the plate cylinder 2 and the impression cylinder 3 via the guide roll 4. The printing drum 2 is a yellow printing drum 2a, a red printing drum 2b, a blue printing drum 2c, and a black printing drum 2d from the paper supply roll 1 side, and the printed web 16 is taken up by a take-up roll 6. A detection head 7 for detecting a register mark (register adjustment mark) printed portion of the plate cylinder 2 is provided at the same position relative to each plate cylinder 2. The position detected by the detection head 7 may be any position corresponding to the reference position of each plate cylinder 2.

The scanning head 8 is provided on the plate cylinder 2 on the downstream side of the corresponding plate cylinder 2. Whether the register mark printed on the plate cylinder 2 on the upstream side and the register mark printed on the downstream side are printed at a predetermined interval. Is detected. When the register mark comes to the position of the scanning head 8, the detection timing is notified by the gate position signal, and the register mark is detected.

The main motor 11 drives each of the plate cylinders 2a to 2d. The rotating shaft is provided with a gear box 12 for each plate cylinder 2, and drives each plate cylinder 2 at the same rotational speed at the same reduction ratio. An encoder 9 is provided on the rotating shaft to detect the amount of rotation. The downstream plate cylinder 2 of the corresponding plate cylinder 2 is provided with a differential gear 14 for shifting the phase of rotation transmitted from the gear box 12, and is driven by a differential gear drive motor 15. This makes it possible to adjust the phase of the downstream plate cylinder 2 with respect to the upstream plate cylinder 2.

The output of the encoder 9 through the line e, the output of the detection head 7 through the line f, and the information from the register control unit 18 through the line k are input to the preset device 17. The preset unit 17 is provided with a storage unit, a calculation unit, and a control unit. , The diameter of the impression cylinder, the position of the detection head, the path length between the printing points of the corresponding plate cylinder, the plate cylinder diameter between the printing point of the plate cylinder and the corresponding scanning head, and the path length corresponding to the impression cylinder diameter Data such as dimensions and arrangements are stored.

The register controller 18 outputs the output of the encoder 9 via line e and the scanning head 8 via line g.
, A plate cylinder phase correction request from the presetting device 17 via line j, and information from the presetting device 17 via line k are input, and a differential gear drive motor control signal is output via line i. The register control device 18 includes a computer, and performs a preset at the start of printing together with the preset device 17 and a subsequent register control.

Next, the preset will be described. First, the plate cylinders 2a to 2d are replaced. Although this operation itself is performed by the printing press operator, the plate cylinders 2a to 2d may be set roughly at the reference positions by roughly setting the plate cylinders 2a to 2d. The corresponding adjustment between the plate cylinders 2 will be described taking the plate cylinders 2a and 2b as examples. Combinations of other plate cylinders 2b and 2c, 2c and 2d
The same is true for After detection head 7 a detects the register mark printing unit of the plate cylinder 2a, determine the amount of rotation of the encoder 9 until detection head 7 b detects the register mark printing unit of the plate cylinder 2b, from the rotational amount The phase difference between the plate cylinders 2a and 2b is determined. In this case, when register marks such as a cross are used as register marks, register control is performed so that the register marks printed by the respective plate cylinders 2a and 2b match. A value proportional to the amount of rotation during detection by 7b is a phase difference. As shown in FIG. 7, when register marks are printed at a predetermined length between register marks, for example, 20 mm apart, this predetermined length is used. The phase difference is calculated in consideration of the difference. In the following description, the register mark will be described as a register mark for easy understanding.

If the phase difference is represented by an angle α, and if the radius of the plate cylinder 2 is r, then both plate cylinders 2a, 2a,
2b is off. Assuming that the path length between the printing points of the plate cylinders 2a and 2b is l ₀ , a value l = l ₀ obtained by adding rα.
+ Rα, and if l is equal to an integral multiple nL of the circumference L of the plate cylinder, as shown in FIG. 2A, the two registration marks are coincident in the scanning head 8a, so that the registration is adjusted. It has become. The distance between the printing points of the plate cylinders 2a and 2b differs depending on the combination of the plate cylinder size and the impression cylinder size. When the plate cylinder 2 is replaced, the printing point goes up and down because the plate cylinder center position is fixed, and accordingly the impression cylinder 3 goes up and down.
And the contact angle of the web 16 is different,
Also changes. When the impression cylinder 3 is replaced, both the contact angle of the impression cylinder 3 and the contact angle of the guide roll 4 change. Therefore, a table of the relationship between the plate cylinder size and the pass length for each impression cylinder size may be stored in the storage unit.

When l <nL, as shown in FIG.
θ = nL−1, the plate cylinder 2b is rotated relative to the plate cylinder 2a, and the plate cylinder 2 is rotated clockwise, and the differential gear drive motor 15a is driven counterclockwise by an angle θ to drive the differential gear 14a
To work. As a result, the register mark is printed by the plate cylinder 2b at a position nL from the position where the register mark was printed on the web 16 by the plate cylinder 2a, and the two marks coincide with each other. Similarly, when l> nL, as shown in (c), rθ = l−nL
And the plate cylinder 2b is rotated clockwise at an angle θ with respect to the plate cylinder 2a.
The differential gear 14a is operated by driving only the gear drive motor 15a. As a result, the register marks printed by the two plate cylinders 2a and 2b coincide with each other. The calculation of θ is performed by the preset device 17
The correction angle θ is instructed to the register controller 18 by the line j, and the gear drive motor 15a is controlled by the register controller 18 by the line i so that the differential gear 14a is shifted by the correction angle θ.

Next, the presetting of the gate position signal will be described. After the detection head 7b detects the register mark printing portion of the plate cylinder 2b, as described with reference to FIG.
The rotation is detected by the encoder 9, and a setting is made so that a gate position signal is generated based on this time. When the gate position signal is generated, the register mark passes through the position of the scanning head 8a, so that the register mark can be reliably detected by the scanning head 8a. The calculation of the angle θ2 is performed by the preset device 17, and as a result, the gate position is determined and transmitted to the register control device 18 via the line k. In this case, the position of opening and closing the gate in response to the gate position signal, that is, the width of the gate is determined by the scanning head 8, but may be determined by the register control device 18.

As described above, if the operator installs the plate cylinder with an approximate accuracy with respect to the plate cylinder, the preset device 17 calculates the corrected phase difference θ between the corresponding plate cylinders 2 and the angle θ2 for setting the gate position. By instructing the register controller 18 to automatically correct the phase and set the gate position, the register controller 18 performs register control thereafter.

Next, a second embodiment will be described. FIG. 5 shows the configuration of the second embodiment, and the same reference numerals as those in FIG. 1 denote the same parts and devices. The second embodiment is different from the first embodiment in that the phase shift mechanism including the differential gear 14 and the differential gear drive motor 15 is eliminated, and the compensator roll 5, the compensator motor 13, and the compensator roll position detector 10 are replaced with each plate. It is provided between the trunks 2. A control signal is output from the register control device 18 to the compensator motor 13 via a line h, and the detected value of the compensator roll position detector 10 is input to a preset device 17 via a line m.

Next, the operation will be described. The plate cylinder 2a and the plate cylinder 2b will be described.
The same applies to b and 2c and 2c and 2d. First, the operator sets the plate cylinder 2 with an approximate accuracy with respect to a reference. As in the first embodiment, the phase difference α of the plate cylinder 2b with respect to the plate cylinder 2a is obtained from the outputs of the detection heads 7a and 7b and the encoder 9.
Is obtained by multiplying by the radius r of the plate cylinder 2 to express the phase difference as a length rα, and the length obtained by adding this rα and the path length l ₀ between the printing points of the plate cylinder 2 at the position of the compensator roll at the present time. Let l be the length. By adding this rα to l ₀ ,
As shown in FIG. 3A, the phase difference α between the plate cylinders 2a and 2b is set to 0.
That is, the phases are matched. After the phases are matched in this way, the position of the compensator roll 5a is driven by the compensator motor 13a so that the path length 1 between the printing points of the plate cylinder becomes an integral multiple nL of the circumference L of the plate cylinder. The result is fed back to the compensator roll position detector 10a.

If l = nL as shown in FIG. 3A, this state is maintained, and if l <nL as shown in FIG.
= NL-l is added to l to make l + Δ = nL, and the position of the compensator roll 5a is set so that the path length between the printing points of the plate cylinder 2 becomes l + Δ. As shown in FIG.
> NL, subtracting Δ = l−nL from l to obtain 1−Δ = n
L, and the position of the compensator roll 5a is set so that the path length between the printing points of the plate cylinder 2 becomes 1−Δ. Next, the gate position is set in the same manner as in the first embodiment. The above calculation is performed by the preset device 17. The setting of the gate position is performed by the preset device 17 as in the first embodiment. The control of the compensator roll motor 13a is performed by the register control device 18.

Next, a third embodiment will be described. FIG. 6 shows the configuration of the third embodiment, and the same reference numerals as in FIGS. 1 and 5 denote the same parts or devices. This embodiment is different from the first embodiment in that the compensator roll 5 and the compensator motor 13 of the second embodiment
The compensator roll position detector 10 is added.

Next, the operation will be described. The plate cylinder 2a and the plate cylinder 2b will be described.
The same applies to b and 2c and 2c and 2d. First, the operator sets the plate cylinder 2 with an approximate accuracy with respect to a reference. As in the first embodiment, the phase difference α of the plate cylinder 2b with respect to the plate cylinder 2a is obtained from the outputs of the detection heads 7a and 7b and the encoder 9, and this α is driven by the differential gear drive motor 15a to obtain the differential gear 14. Are operated, and the phase difference θ is eliminated to make them in-phase. In this state, the position of the compensator roll 5a is calculated so that the path length between the printing points of the plate cylinder 2 becomes an integral multiple nL of the plate cylinder circumference L, and the compensator motor 13a is operated based on this value. The result is fed back to the compensator roll detector 10a. The gate position is set in the same manner as in the first embodiment. The above calculation, the control of the differential gear drive motor 15 and the setting of the gate position are performed by the preset device 17, and the control of the compensator motor 13 is performed by the register control device 18.

[0033]

As is apparent from the above description, in the present invention, the phase difference between the plate cylinders is obtained in the preset stage, and the register marks are printed at predetermined intervals using the phase correcting means and / or the compensator roll. Perform initial settings automatically so that you can At this time, the gate position is automatically set so that the scanning head can detect the register mark. This eliminates the hassle of manually adjusting the phase of each plate cylinder, and the initial register control at the time of plate cylinder replacement is automatically performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a diagram illustrating the operation of the first embodiment.

FIG. 3 is a diagram illustrating the operation of the second embodiment.

FIG. 4 is a diagram illustrating gate setting.

FIG. 5 is a configuration diagram of a second embodiment.

FIG. 6 is a configuration diagram of a third embodiment.

FIG. 7 is a diagram illustrating the arrangement of register marks.

FIG. 8 is a diagram illustrating a case where a register mark is shifted.

[Description of Signs] 2 plate cylinder 3 impression cylinder 5 compensator roll 7 detection head 8 scanning head 9 encoder 10 compensator roll position detector 11 main motor 12 gear box 13 compensator motor 14 differential gear 15 differential gear drive motor 16 web 17 Preset device 18 Register control device

Claims (3)

(57) [Claims] 1. A scanning head detects registration marks of a plurality of plate cylinders printed on a running web by using a preset gate position signal, and adjusts the registration marks so that they are printed at predetermined intervals. In the preset device of the register control device, a detection head provided for each plate cylinder and detecting a reference position of each plate cylinder, rotation amount detection means for detecting a rotation amount of each plate cylinder rotating at the same rotation speed, and a plate A storage unit that stores data including a diameter of a cylinder, a diameter of an impression cylinder, a position of the detection head, and a path length between printing points of a corresponding plate cylinder;
A phase correction means for correcting the phase difference between the corresponding plate cylinder, for said detection head provided in the corresponding plate cylinder, whereas <br/> detection head and the other detection head than when outputting the detection value A phase difference of the corresponding plate cylinder is obtained from the rotation amount of the rotation amount detecting means until the detection value is output, and a correction position such that the register adjustment mark is printed at a predetermined interval based on the data in the storage unit. A preset device of a register control device, comprising: a preset control unit that calculates a phase difference and outputs the calculated difference to the phase correction unit. 2. A registration head of a plurality of plate cylinders printed on a running web is detected by a scanning head using a gate position signal set in advance, and each registration mark is printed at a predetermined interval. In a preset device of a register control device for adjusting a position of a compensator roller arranged between plate cylinders, a detection head provided for each plate cylinder and detecting a reference position of each plate cylinder, and each plate rotating at the same rotation speed. Rotation amount detecting means for detecting the rotation amount of the cylinder, the diameter of the plate cylinder, the diameter of the impression cylinder, the position of the detection head, the path length between the printing points of the corresponding plate cylinder, and the compensator roll at the time of the path length. With respect to the storage unit that stores data including the position and the detection head provided on the corresponding plate cylinder, the other detection head outputs the detection value from when one of the detection heads outputs the detection value. The phase difference of the corresponding plate cylinder is obtained from the rotation amount of the rotation amount detecting means during the period up to and the movement amount of the compensator roll is calculated based on the data in the storage unit so that the register adjustment mark is printed at a predetermined interval. And a preset control section for outputting to the register control device. 3. The storage section also stores the path length between the scanning point corresponding to the printing point of the plate cylinder and the preset control section causes the downstream detection head to register the registration adjustment mark based on the data in the storage section. Detecting a rotation amount of the rotation amount detecting means until a scanning position corresponding to the scanning head generates a gate position signal for detecting the register adjustment mark. 3. The preset device of the register control device according to 1 or 2.