JPH1086343A - Method for adjusting register in rotary press and rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for adjusting a register in a rotary press capable of adequately executing phase correction in a short time and effectively improving printing quality. SOLUTION: In a method for adjusting a register in a sectional driving type rotary press, a register mark printed on a printing web by each printing unit is detected by a register mark detection sensor 19 and presence or absence of the shift of the register is judged in accordance with a distance between the registers. When there is the shift of the registers, phase correction is executed in accordance with an error quantity of the shift of the registers such that driving speeds of a printing unit wherein the shift of the registers occurs and each of printing units from the above printing unit to the last stage thereof at the web winding side are changed by maintaining synchronizing of each of the printing units and having the same operation quantity. After the phase correction is completed, the driving speed of each printing unit is returned to the synchronous driving speed, then all of the printing units are subjected to the synchronous driving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a register adjusting method and a rotary printing press for a rotary printing press for performing multi-color gravure printing, and more particularly to a register adjusting method and a rotary printing press for a section-driven rotary printing press. It is.

[0002]

2. Description of the Related Art As a register adjustment method in a rotary printing press, a printing cylinder having a plurality of printing units each having a plate cylinder, an impression cylinder, and a guide roller, and a plate cylinder of each printing unit is provided for each printing unit. In a rotary printing press of a sectional drive system, which is driven independently for each printing unit by the rotary drive unit, the registration mark printed on the print web by each printing unit is detected by the registration mark detection sensor, and the registration mark is shifted from the registration mark distance. Is determined, and if there is a misregistration, the driving speed of the printing unit on the web take-up side is controlled by a speed fine adjustment mechanism such as a harmonic drive for the misregistration between the two misaligned printing units. (Plate rotation speed) is changed only to correct the phase, and after the phase correction is completed, the drive speed of the printing unit is synchronized with the previous synchronous drive. It is restored each time the Hei 7-
No. 266548.

As one specific example, when printing is sequentially performed from the first printing unit to the sixth printing unit, the registration marks 1PU to 6PU of each printing unit are arranged as shown in FIG. Assuming that the distance between register marks in a proper state with no deviation is L0, the register mark distance between printing units in the proper state has the following relationship.

L1 = L2 = L3 = L4 = L5 = L0 L12 = 2 (L0) L13 = 3 (L0) L14 = 4 (L0) L15 = 5 (L0) Distance L1 and L2 between register marks between printing units. , L
3, L4 and L5 are individually managed.

When a phase shift occurs between the first printing unit and the second printing unit, L1 ≠ L0, L2 = L3 =
L4 = L5 = L0, and conventionally, the phase between the first printing unit and the second printing unit is corrected by changing only the plate cylinder rotation speed of the second printing unit so that L1 = L0, After completion of the phase correction, the drive speed of the second printing unit is returned to the previous synchronous drive speed.

[0006]

In order to correct the phase between the first printing unit and the second printing unit, if only the plate cylinder rotation speed of the second printing unit is changed, the third printing unit to the fourth printing unit are changed. Between the units, between the fourth printing unit-the fifth printing unit, between the fifth printing unit-the sixth printing unit does not affect the phase, the appropriateness of the phase between these printing units is maintained, During the speed change period (phase correction period), a phase shift (register error) occurs between the second printing unit and the third printing unit.

If the amount of phase correction, that is, the amount of register correction, is large, a register error is detected between the second printing unit and the third printing unit during the phase correction between the first printing unit and the second printing unit. The plate cylinder rotation speed of the third printing unit is changed for the correction. Along with this, a registration error is detected between the third printing unit and the fourth printing unit, and the plate cylinder rotation speed of the fourth printing unit is changed for correction thereof. Register errors are sequentially detected between the fifth printing unit and between the fifth printing unit and the sixth printing unit, and the plate cylinder rotational speeds of the fifth printing unit and the sixth printing unit are also changed.

When the phase correction between the first printing unit and the second printing unit is completed and the driving speed of the second printing unit is returned to the previous synchronous driving speed, the register between the second printing unit and the third printing unit is registered. The error is magnified, and a similar phenomenon occurs between the third printing unit and the fourth printing unit, between the fourth printing unit and the fifth printing unit, and between the fifth printing unit and the sixth printing unit. The mechanism does not work effectively, and it takes a lot of time to correct the phase,
Improving print quality is not effective.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and performs accurate phase correction in a short time.
It is an object of the present invention to provide a register adjusting method and a rotary printing press in a rotary printing press capable of effectively improving print quality.

[0010]

In order to achieve the above-mentioned object, the invention according to claim 1 has a plurality of printing units each having a plate cylinder, an impression cylinder, and a guide roller. In a register adjustment method in a rotary printing press of a sectional drive system in which a cylinder is independently driven for each printing unit by an individual rotary drive device provided for each printing unit, a registration mark printed on a print web by each printing unit is used. A registration mark is detected by a registration mark detection sensor, and the presence or absence of a registration shift is determined based on a distance between registration marks. The driving speed of each printing unit up to the last printing unit on the web take-up side is maintained while maintaining the synchronization between these printing units. With a manipulated variable is changed in performs phase modification, the return to the synchronous driving speed driving speed of each printing unit after completion phase correction is for synchronously driving all printing units.

In the register adjusting method according to the present invention, the speed change for the phase correction is performed by changing the printing unit from the printing unit having the misregistration and the printing unit from the printing unit to the last printing unit on the web winding side. Since the units are operated with the same operation amount while maintaining the synchronism between these printing units, there is no occurrence of misregistration between subsequent printing units due to this speed change.

According to a second aspect of the present invention, in the register adjusting method for a rotary printing press according to the first aspect, when the distance between register marks is shorter than a specified value, a register shift occurs according to the shortened amount. Increase the drive speed of each printing unit from the printing unit and the printing unit to the last printing unit on the web winding side from the printing unit,
If the distance between register marks is longer than the specified value,
The driving speed of each printing unit from the printing unit in which the misregistration occurs and the printing unit at the last stage on the web winding side is reduced in accordance with the extension amount.

In the register adjusting method according to the present invention, the register is adjusted by appropriate phase correction both when the distance between register marks is shorter than a specified value and when the distance between register marks is longer than a specified value. Is done properly.

The invention according to claim 3 provides a plate cylinder, an impression cylinder,
In a rotary printing press of a sectional drive system, which has a plurality of printing units provided with guide rollers and independently drives a plate cylinder of each printing unit for each printing unit by an individual rotary driving device provided for each printing unit. A registration mark detection sensor that detects a registration mark printed on a print web in each printing unit, and determines the presence or absence of a registration deviation based on a distance between the registration marks detected by the registration mark detection sensor. In accordance with the error amount of the misregistration, the printing unit in which misregistration has occurred and the drive speed of each printing unit from the printing unit to the last printing unit on the web winding side, these printing units The phase is corrected by changing the same operation amount while maintaining the synchronization between the printing units. Returns the driving speed to the synchronous drive speed, in which and a register adjustment control means for synchronously driving all printing units.

In the rotary printing press according to the present invention, the register mark printed on the print web by the printing unit is detected by the register mark detecting sensor. If there is a register shift, the speed change for phase correction is performed by the register shift. Is performed with the same operation amount while maintaining the synchronization between the printing units and the printing units from the printing unit to the last printing unit on the web winding side from the printing unit.

According to a fourth aspect of the present invention, in the rotary printing press according to the third aspect, when the distance between register marks is shorter than a specified value, the register adjustment control means shifts the register according to the shortened amount. When the drive speed of each printing unit from the printing unit where the error occurs and the printing unit to the last printing unit on the web winding side is increased, and the distance between register marks is longer than a specified value. Is to reduce the drive speed of each printing unit from the printing unit in which misregistration occurs according to the amount of expansion and the printing unit to the last printing unit on the web winding side.

In the rotary printing press according to the present invention, both when the distance between register marks is shorter than a specified value and when the distance between register marks is longer than a specified value,
Register adjustment is appropriately performed by proper phase correction.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment in which the rotary printing press according to the present invention is applied to a six-unit gravure rotary printing press. This gravure rotary printing press has six printing units 1 ₁
To 1 ₆ has in a row, perform 6-color by straight printing. On the side of the printing unit 1 ₁ is provided in the unwinding unit 3 and the in-feed unit 5, on the side of the printing unit 1 ₆ is provided with a outfeed unit 7 and the take-up unit 9.

[0020] Each of the printing units ₁ 1 to 1 _6, the plate cylinder 1
1, an impression cylinder 13 and a guide roller 15 are provided. Servomotor 17 for each printing unit ₁ 1 to 1 _{6 1-17 6}
Is provided, the servo motor 17 ₁ to 17 ₆ are each printing unit ₁ 1 to 1 ₆ plate cylinder 11 to the printing units 1 ₁
Independently driven every ~ ₁₆ .

[0021] The printing unit 1 ₆ of the final stage, the register mark of the photoelectric type which detects each of the printing units 1 ₁ to 1 ₆ in the printing web in the printed register mark PU1~PU6 (see FIG. 3) optically A detection sensor 19 is provided.

FIG. 2 shows a control system of the gravure rotary printing press. Drive control unit 21, a digital signal processor (hereinafter, DSP) 23, a memory unit 25, a motor control interface unit 27 ₁ to 27 ₆ provided in each servo motor 17 ₁ to 17 every _6, register mark detection sensor Sensor interface unit 2 that takes in the signal from 19
8, an input interface unit 31, and an output interface unit 33. The input interface unit 31 includes an input device 35 such as a keyboard.
A display device 37 such as a CRT is connected to 3.

The DSP 23 receives an operation command signal and a speed command signal from a printing press control circuit (not shown).
Each servomotor 17 _{1-17 6} rotary encoder 29 connected to the _{1-29 6} each motor control interface unit 2 a rotation angle signal as a position feedback signal from the
7 _1-27 inputted from _6, each motor control interface unit 27 ₁ to 27 ₆ each servomotor 17 _1-17 via
Simultaneously outputs the respective position command signal (rotation angle command signal) ₆ to the servo amplifier 39 _{1-39 6.}

Thus, the DSP 23 has a software servo function for controlling the servo system of each of the printing units ₁₁ to ₁₆ forming a position loop of a fixed cycle, and connects the servo systems of each of the printing units ₁₁ to ₁₆ in parallel. To process.

With the above-described configuration, the DSP 23 continuously generates a position command signal while maintaining a rate of change according to a predetermined acceleration time and a deceleration time during acceleration and deceleration. continuously generating a position command signal to maintain the time interval corresponding to, in any case, to maintain synchronization of the rotational speed of the plate cylinder 11 of the servo motor 17 ₁ to 17 ₆ by Soutowea synchronization.

The rotary encoder 29 ₁ to 29 ₆ connected to the servo motor 17 ₁ to 17 ₆ is of the absolute type, the plate cylinder 11 of each printing unit ₁ 1 to 1 _6, which is removable by the key engagement is connected with the rotational phase determined in the driving system and standardized by the servo motor 17 ₁ to 17 ₆ of the unit body side, the position of the printing register adjustment register mark provided on the plate cylinder 11 It has to be managed by the output signal of the rotary encoder 29 ₁ to 29 _6.

The DSP 23 includes the rotary encoder 2
9 _{1-29 6} recognizes the rotational phase of the plate cylinder 11 of each printing unit 1 ₁ to 1 ₆ by the rotation angle signal outputting, the guide roller diameter, the impression cylinder diameter, distance between the axes of the plate cylinder 11 and the guide roller 15 The web path length between the printing units is calculated from the fixed value such as
The printing cylinder 1 between the printing units ₁₁ to ₁₆ depends on the circumference of the printing cylinder 1.
1 is calculated, and the plate cylinder rotation angle (phase difference correction angle) for the initial register preset adjustment is obtained for each printing unit from the phase difference, and the rotary encoders 29 ₁ to 29 of the printing units ₁₁ to ₁₆ are obtained. 29 ₆ compared with the state origin position and outputs a rotation angle signal representing the (printing register adjustment register mark plate cylinder 11 is directly below, the rotational position of the plate cylinder 11 located at the home position, such as immediately above), each printing Unit 1 ₁
To 1 ₆ the rotation angle command signal to rotate the phase difference correction angle by the plate cylinder 11 and outputs it to the servo amplifiers 39 ₁ to 39 ₆ for. As reference printing unit of the printing units 1 ₁ Thus, the initial register preset adjustment.

For a more detailed description of the initial register preset adjustment, please refer to the specification and drawings of Japanese Patent Application No. 8-20284 filed by the same applicant as the present applicant.

The DSP 23 serves as a register adjustment control means.
The distances L1, L2, L3, L4, and L5 between the register marks detected by the register mark detection sensor 19 are each compared with the distance L0 between the register marks in an appropriate state to calculate an error amount. If it is the above, it is determined that a misregistration requiring register adjustment has occurred, and in this case, according to the amount of misregistration error, the printing unit in which misregistration occurs and the printing unit concerned The phase correction is performed by changing the drive speed of each printing unit up to the last printing unit on the web winding side with the same operation amount while maintaining the synchronization between these printing units, and after the phase correction is completed, The driving speed of each printing unit is returned to the synchronous driving speed, and a series of sequence control for synchronously driving all the printing units is performed.

Thus, when a register error occurs, register correction is performed without affecting printing units having normal registration, and register correction time is shortened and stable register correction is performed.

[0031] Here, when the sequential printing is performed from the printing unit 1 ₁ to the printing unit 1 _6, L1 ≠ L
Register registration in the case of 0, L2 = L3 = L4 = L5 = L0 will be described.

[0032] This situation misregister has occurred between the printing units 1 ₁ -1 _2, registration between the other printing units is normal.

The misregister relative to the printing unit 1 ₁ is represented by the following equation. Here, Le is an error amount.

[0034] L1 = L0 + Le L12 = 2 (L0) + Le L13 = 3 (L0) + Le L14 = 4 (L0) + Le L15 = 5 (L0) + Le single drive control DSP23 performing the printing unit 1 ₁ other printing unit each of 1 _{2-1 6} gives the position command the same operation amount at the same time, performs a gear shift of the plate cylinder 11 while maintaining synchronicity with each printing unit 1 _{2-1 6} single position loop, the predetermined amount After shifting, return to the speed before shifting.

Next, the following conditions are considered.

L 1 = L 0, L 2 ≠ L 0, L 3 = L 4 = L 5 = L 0 This is between the printing units 1 _{1 and} 1 ₂ and the printing unit 1 ₃
-1 between _4, the printing unit 1 ₄ -1 between _5, the printing unit 1
_5-1 does not require a register correction between _6, the printing unit 1 ₂
Shows a case that requires -1 ₃ of register correction.

[0037] In this case, print a phase correction amount of the printing unit 1 ₃ for the printing unit 1 ₁ of the reference unit 1
At the same time _3, corresponding by giving while maintaining the printing unit 1 _4, 1 _5, 1 ₆ also synchrony. In this case, not perform the operation of speed change to the printing unit 1 _2.

The speed change for register correction (phase correction) is an increase in speed when the distance between register marks is shorter than a specified value, and when the distance between register marks is longer than a specified value. There is deceleration.

Thus, in both the case where the distance between register marks is shorter than the specified value and the case where the distance between register marks is longer than the specified value, register adjustment is appropriately performed by appropriate phase correction.

[0040] In the above description has been that the only register correction printing unit of the take-up side, the printing unit 1 ₁
-1 ₂ During or when the misregister in the printing unit 1 ₂ -1 ₃ occurs, the register correction in the printing unit of the sheet feeding side, the printing unit 1 ₃ -1 between _4, the printing unit 1 ₄ -1 ₅ while,
If the misregister between the printing unit 1 ₅ -1 ₆ occurs, it may be carried out register correction in printing knit take-up side.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to this, and various embodiments may be made within the scope of the present invention. The possibilities will be clear to the skilled person.

[0042]

As can be understood from the above description, according to the register adjusting method of the rotary printing press according to the first aspect and the rotary printing press according to the third aspect, the speed change for the phase correction (register correction) can be performed. For the printing unit in which misregistration has occurred and the printing unit from the printing unit to the last printing unit on the web take-up side, maintain the synchronization between these printing units and maintain the same operation amount. Therefore, no misregistration occurs between the subsequent printing units due to the speed change, the phase correction is accurately performed in a short time, and the print quality can be effectively improved.

According to the register adjusting method of the rotary printing press according to the second aspect and the rotary printing press according to the fourth aspect, the case where the distance between the register marks is shorter than the specified value and the case where the distance between the register marks are longer than the specified value. In any case, the register adjustment is appropriately performed by proper phase correction.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment in which a rotary printing press according to the present invention is applied to a 6-type gravure rotary printing press.

FIG. 2 is a block diagram showing one embodiment of a control system of the gravure rotary printing press.

FIG. 3 is an explanatory diagram illustrating a print example of a register mark.

[Explanation of symbols]

Reference Signs List 1 ₁ to 1 ₆ Printing unit 3 Unwinding section 5 In-feed section 7 Out-feed section 9 Winding section 11 Plate cylinder 13 Impression cylinder 15 Guide roller 17 _{1 to} 17 ₆ Servo motor 19 Register mark detection sensor 21 Drive control device 23 Digital Signal processor (DSP) 25 Memory unit

Continued on the front page (72) Inventor Makoto Hayashi 2068-3, Ooka, Numazu-shi, Shizuoka Toshiba Machine Co., Ltd. Numazu Office (72) Inventor Masahiro Watanabe 2068-3, Ooka, Numazu-shi, Shizuoka Toshiba Machine Co., Ltd. Numazu Office

Claims (4)

[Claims] 1. A printing apparatus comprising: a plurality of printing units each including a plate cylinder, an impression cylinder, and a guide roller, wherein each printing unit is provided with a plate cylinder by a separate rotary driving device provided for each printing unit. In a register adjustment method for a section-driven rotary printing press that is driven independently, a registration mark printed on a printing web in each printing unit is detected by a registration mark detection sensor, and the presence or absence of a registration shift is determined from the distance between the registration marks. If there is a misregistration, the printing units in which misregistration occurs and the driving of each printing unit from the printing unit to the last printing unit on the web winding side are performed according to the misregistration error amount. The speed is changed with the same operation amount while maintaining the synchronism between these printing units to perform phase correction, and after completion of the phase correction, Returns the drive speed of the printing unit in synchronization driving speed, registration adjustment method in a rotary printing press, characterized by synchronously driving all printing units. 2. When the distance between register marks is shorter than a specified value, the printing unit in which a register shift occurs according to the shortened amount and the printing unit at the last stage on the web winding side from the printing unit. If the drive speed of each printing unit is increased and the distance between the register marks is longer than a specified value, the printing unit having a misregistration according to the amount of expansion and the web winding from the printing unit concerned. 2. The register adjustment method for a rotary printing press according to claim 1, wherein the drive speed of each printing unit up to the last printing unit on the take-off side is reduced. 3. A printing unit having a plurality of printing cylinders each having a plate cylinder, an impression cylinder, and a guide roller, wherein each printing unit is provided with a plate cylinder by a separate rotary drive device provided for each printing unit. In a section drive type rotary printing press that is independently driven, a registration mark detection sensor that detects a registration mark printed on a printing web in each printing unit, and a registration is determined based on a distance between the registration marks detected by the registration mark detection sensor. Determine the presence or absence of misalignment, if there is misregistration, according to the amount of misregistration error, from the printing unit in which misregistration has occurred and from the printing unit to the last printing unit on the web winding side The drive speed of each printing unit is changed with the same operation amount while maintaining the synchronization between these printing units, and the phase is corrected. Returns the driving speed of each printing unit to the corrected completion synchronous drive speed, a rotary printing press, characterized in that a, a register adjustment control means for synchronously driving all printing units. 4. The register adjustment control means, when the distance between register marks is shorter than a specified value, a printing unit in which a register shift has occurred according to the shortened amount and a web winding side relative to the printing unit. If the drive speed of each printing unit up to the last printing unit is increased, and the distance between register marks is longer than the specified value, the printing unit that is misregistered according to the amount of expansion The rotary printing press according to claim 3, wherein the drive speed of each printing unit from the printing unit to the last printing unit on the web winding side is reduced.