JP2004262060A - Overprinting device of printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overprinting device of a printing machine, which enables automatic registering at the start of overprinting, and which can suppress a good deal of paper waste and a loss of time. <P>SOLUTION: This overprinting device of the printing machine is equipped with a DSP part 21 for synchronously driving plate-cylinder driving motors of a plurality of printing units. In the overprinting device, at the start of the overprinting, after the adjustment of initial phases among respective plate cylinders of the printing units, a phase between a signal of a pattern of a web or a register mark position, which is detected by a mark sensor 29, and a signal of a rotational position of the plate cylinder is predetermined as a plate-cylinder phase correction angle from the length of the plate cylinder and a distance between an inputted plate cylinder/impression cylinder contact part and the mark sensor 29 by the DSP part 21; and a change of a plate-cylinder driving speed makes a plate-cylinder phase changed by the plate-cylinder phase correction angle with respect to the signal of the pattern or the register mark position. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary printing press, and more particularly to a rotary printing press that performs additional printing on a web (printed web).
[0002]
[Background Art]
Conventionally, in gravure printing or the like, additional printing (additional printing) may be performed on a raw material.
This additional printing is performed, for example, when a printed material having the same pattern but only partially different, such as a description of a store name, a manufacturer name, weighing relating to manufacturing, or the like is required. In this case, printing excluding different character portions and the like is collectively completed in advance for the total amount, and if necessary, the printing is performed again by using a plate cylinder in which only the different portions are made.
[0003]
By the way, for example, in gravure printing for packaging, a stretchable film is often used as a web. In this case, printing of the second color is performed following printing of the first color, registration is performed in both printings, and 3 The registration of the colors and the fourth color is performed, and the misregistration is corrected by, for example, adjusting a web path, thereby eliminating the misregistration of printing.
In addition, in the case of post-printing, even if the same tension can be reproduced in the pre-printing and post-printing, it is difficult to completely reproduce the stretched state of the web, which is the printed material that has already been printed and dried. In addition, since the production error of the circumference of the plate cylinder for additional printing may occur, etc., the peripheral pitch of the plate cylinder for additional printing and the printing pitch in the state where the pre-printed web is stretched by applying tension to the same. It's difficult to get it.
[0004]
Conventionally, a registering operation for aligning a register mark at the time of reprinting with a register mark of a preprinted web is first provided on a side that supplies the web to a printing unit that performs the additional printing and a side that rewinds the web. After the coarse adjustment is performed by adjusting the tension of the infeed portion and the outfeed portion, additional printing is performed once in this state. Then, the actually reprinted print is compared with the register mark of the preprinted web, and fine adjustment is performed by increasing or decreasing the web path length with respect to the plate cylinder using a register correction roller or the like, and performing initial adjustment. The print registration is adjusted (for example, Patent Document 1). In addition, when printing using the preprinted web by replenishing, stop the printing press once at the time of splicing, perform additional printing once again, and then, as described above, the actual printing After confirming the register mark, the initial print register is adjusted using a register correction roller or the like.
[0005]
[Patent Document 1]
JP 2000-117950 A
[Problems to be solved by the invention]
However, the registration operation by the register correction roller is to perform additional printing once on the preprinted web, and then compare the actually printed additional printing with the register mark of the preprinted web to obtain the printing cylinder. Since the fine adjustment is performed by increasing or decreasing the web path length for the printing, there is a problem that a large amount of waste paper is generated until the register marks for the first printing and the additional printing are aligned.
In addition, when printing using the preprinted web by replenishing, even though the additional printing is performed normally, the printing press is stopped once and the additional printing is performed. There is a problem that it occurs and spends a lot of time.
[0007]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a reprinting apparatus for a printing press, in which register adjustment can be automatically performed at the start of reprinting printing, and significant loss of paper and time can be suppressed.
[0008]
[Means for Solving the Problems]
A reprinting device for a printing press according to claim 1 of the present invention has a plate cylinder, an impression cylinder, a guide roller, and a plate cylinder driving motor for driving the plate cylinder, and a plurality of printing units arranged in a line. A unit, a web supply mechanism that supplies a web to the plurality of printing units, a web winding mechanism that winds the web, and an integrated control unit that synchronously drives plate cylinder driving motors of the plurality of printing units. In the reprinting device for a printing press, the integrated control unit includes: a position detector that detects a rotation speed and a phase of the plate cylinder; and a plate detector of the printing unit that performs first color printing in the plurality of printing units. Register mark detection means for detecting a register mark of a raw material mounted on the web supply mechanism, provided upstream, and each plate cylinder of the plurality of printing units is used when additional printing is started. After the initial phase adjustment is performed, the phase between the signal of the register mark position of the raw material detected by the register mark detecting means and the signal of the rotational position of the plate cylinder is set in advance by the input plate. The plate cylinder phase correction angle is obtained from the distance between the cylinder / impression cylinder contact portion and the mark detection means and the plate cylinder length, and the plate cylinder phase is changed with respect to the register mark position signal, and the plate cylinder drive speed is changed. Thus, the plate cylinder phase correction angle is changed.
Here, the register mark is not limited to a mark printed for alignment, but also includes a specific part of a picture printed on a web.
The web is a printed web, that is, a preprinted web.
[0009]
According to this configuration, when additional printing is started, the register mark position of the original is detected by the register mark detecting means, and the phase between the register mark position and the rotational position of the plate cylinder is determined by the plate cylinder phase correction angle. The adjustment is performed by changing the speed of the plate cylinder by the plate cylinder phase correction angle.
Therefore, it is not necessary to perform the additional printing once for the first printing, and it is possible to suppress a large loss of paper and loss of time.
[0010]
In the present invention described above, at the time of automatic splicing using the material web automatically added, the signal of the material splicing is used as a trigger, and a signal of the register mark position of the material web detected by the register mark detecting means, The phase between the signal of the rotation position of the plate cylinder and the pre-input plate cylinder / press cylinder contact portion, the distance between the mark detection means and the plate cylinder length and the plate cylinder phase correction angle as the plate cylinder phase correction angle. It is desirable to change the plate cylinder phase with respect to the register mark position signal by a plate cylinder phase correction angle by changing the plate cylinder drive speed.
[0011]
According to this configuration, in the case of additional printing in which the web is automatically added, a signal at the time of splicing is used as a trigger to determine the plate cylinder phase correction angle, and the speed of the plate cylinder is calculated by the plate cylinder phase correction angle. Adjustments are made to change.
Therefore, it is not necessary to stop the printing machine once at the time of splicing, and it is not necessary to perform the additional printing for the first printing, thereby making it possible to suppress much more waste and time loss. .
[0012]
In addition, it is preferable that the register mark of the raw material be used as a reference mark at the time of print register adjustment during the continuous printing.
According to this configuration, since the register mark of the raw material is already registered, the register can be easily maintained by using the register mark as a reference mark at the time of print register adjustment.
[0013]
Further, the plate cylinder driving motor of each printing unit includes a motor position detector for detecting a rotation speed and a phase of the motor, and a position detector for detecting the rotation speed and the phase of the plate cylinder is provided for the motor. It is desirable that the position detector be shared.
According to this configuration, the rotational speed and the phase of the plate cylinder driving motor and the rotational speed and the phase of the plate cylinder can be detected by the motor position detector. The number of parts can be reduced.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a six-row straight gravure rotary printing press to which a reprinting device for a printing press according to the present invention is applied.
The rotogravure printing machine 1 is provided with six printing units 2 ₁ to 2 ₆ arranged in a row, with the straight printing (web, continuously passed through the these printing units 2 ₁ to 2 ₆ Printing a function for 6-color by), for example, and a function for overprinting printing using first color and printing unit 2 _1, 2 ₂ of the second color.
[0015]
Upstream of the printing unit 2 _first stream (left side in FIG. 1) is unwinding unit 3 and the in-feed unit 4 is disposed as a web supply mechanism, the downstream side of the flow of the printing unit 2 ₆ (right side in FIG. 1 2), an outfeed section 5 and a winding section 6 as a web winding mechanism are arranged.
[0016]
Each printing unit 2 ₁ to 2 _6, the plate cylinder 7 constituting each printing unit, a plurality of guide rollers 9, etc. of the impression cylinder 8 and free rotation is provided. In each printing unit ₂ 1 to 2 _6, the plate servomotor ₁₀ 1 to 10 ₆ of the cylinder 7 for driving respectively provided through the transmission gear (not shown) or the like, these servo motors ₁₀ 1 to 10 by _6, the plate cylinder 7 provided on each printing unit 2 ₁ to 2 ₆ is adapted to be driven independently. Then, the servo motor ₁₀ 1 to 10 ₆ shaft end, provided the encoder ₁₂ 1 to 12 ₆ as a position detector (see FIG. 2) provides a feedback signal of the motor output shaft, such as the servo motors 10 ₁ It has become.
Therefore, these encoders 12 ₁ to 12 ₆ has a function as a position detector for detecting the rotational speed and phase of the plate cylinder 7.
[0017]
FIG. 2 shows a drive control device 20 that controls the gravure rotary printing press 1. The drive control unit 20 includes a DSP (digital signal processor) 21 which operates as an integrated control unit, a memory unit 22 for storing various data, a servo controller (control _circuit) for the plate cylinder 23 1-23 _6, It includes a tension control unit 25 and an input / output I / F (interface) unit 26.
[0018]
The input / output I / F unit 26 detects an input device 27 for inputting various data, a display device 28 such as a CRT, and a register mark (including a specific part in a picture) of a web (printed web). And a mark sensor 29 as a register mark detecting means.
Incidentally, the plate cylinder servo controller ₂₃ 1-23 ₆ correspond to all of the servo motor ₁₀ 1 to 10 ₆ provided on each printing unit ₂ 1 to 2 _8.
[0019]
The memory unit 22, with the distance L _S, etc. between the junction location and the plate cylinder 7 and the impression cylinder 8 of the mark sensor 29 that is input by the input device 27 is adapted to be stored, overprinting Various data such as a printing unit number is stored.
[0020]
DSP unit 21, the distance L _S, etc. between the junction location and the plate cylinder 7 and the impression cylinder 8 of the mark sensor 29 through the input device 27 is inputted, and stores these data in the memory unit 22. Further, operation command from the printing press control device 40, given the speed command to the servo controller 23 _{1-23 6} for each plate cylinder of the printing unit, providing at the same time each single position command (rotational angle) signal.
Further, a position command signal is given to a printing unit for performing additional printing.
[0021]
Also, DSP unit 21, the constant-speed operation to maintain the time interval corresponding to the speed command, and transmits continuously the position command signal to the servo controller 23 _{1-23 6.} At this time, the synchronization of each plate cylinder 7 is maintained by software synchronization of the DSP unit 21. During acceleration and deceleration, the position command signal is continuously transmitted while maintaining the rate of change according to the predetermined angular acceleration acceleration time and deceleration time. That is, the synchronism of each plate cylinder 7 is synchronized by the software of the DSP unit 21. To maintain.
[0022]
Each plate cylinder servo controller ₂₃ 1-23 _6, the speed command signal from the DSP unit 21 is given as the control target value. In response to this, when the drive signal corresponding to a command signal from the servo amplifier ₃₀ 1 to 30 ₆ are outputted to the servo motor ₁₀ 1 to 10 _6, an encoder connected to the shaft end of the servo motor ₁₀ 1 to 10 ₆ rotation angle signal is input to the servo controller ₂₃ 1-23 ₆ as a position feedback signal from 12 ₁ to 12 _6. Plate cylinder servo controller ₂₃ 1-23 ₆ constitutes a position loop ₃₂ 1-32 ₆ fixed period (servo system sampling period), and has a software servo function of controlling the respective servo systems.
[0023]
Tension control unit 25 is synchronized with the command signal generator to the plate cylinder servo controller ₂₃ 1-23 ₆ are driven synchronously by a speed signal from the DSP unit 21. That is, the tension control unit 25 controls the web tension based on the tension control command signal from the DSP unit 21.
[0024]
In the above configuration, for example, when performing printing chase with 2-color printing unit 2 _1, 2 _2, the printing unit 2 ₁ of these follow for _printing, 2 only ₂ is driven, the remainder of the printing unit 2 _{3 26} are set not to be driven and stored in the memory unit 22.
Thereafter, the raw attached to unwinding unit 3, assume winding the web into the winding unit 6 through the printing units 2 ₁ to 2 _6.
[0025]
Next, by 1,2-color printing unit 2 _1, 2 initial setting of the printing unit plate cylinder on the register mark phase between ₂ and starts then overprinting printing.
Here, the register mark position angle on the first color plate cylinder when the initial setting is performed as ".theta.0 _1", the register mark position angle on the second color plate cylinder ".theta.0 _2", hereinafter, the order third color and "θ0 _3", the fourth color "θ0 _4", the fifth color "θ0 _5", the registration mark position angle on the 6-color plate cylinder "θ0 _6".
Note that the origin angle of each plate cylinder 7 is initialized in advance.
[0026]
After the web tension stability, by the mark sensor 29 inputted from the encoder 12 ₁ as a position detector provided the first color plate cylinder phase angle when detecting a predetermined register mark of raw servo motor 10 _1. This value is referred to as “θ _R ” (see FIG. 4).
[0027]
Here, as shown in FIG. 3, a raw length between the mark sensor 29 from the plate cylinder, the impression cylinder contacts the "L _S", the plate cylinder circumferential length (repeat length) and "L _P".
Further, when “θ _P ” is a phase difference between the “θ _R ” position on the plate cylinder and the predetermined register mark of the raw material,
_{θ P = 2π * (L S} % L P)
It becomes. Here,% is an operator for obtaining a remainder.
[0028]
However, the position of the register mark on the plate cylinder of the additional printing unit and the register mark of the raw material coincide with each other at the plate cylinder / impression cylinder contact portion, or maintain a predetermined distance (shift the predetermined distance to avoid overlapping marks). By providing a register mark, the initial purpose can be achieved, and therefore, a movement amount (angle) “θ” for moving the plate cylinder phase to the coincident position is obtained.
When the representative of the phase from the plate cylinder origin to a predetermined register mark of the original fabric in the plate cylinder rotation angle (referred to as "θ _M"),
θ _M = θ _R + θ _P
It becomes.
[0029]
Since the register mark position angle of the additional printing unit at the time of the initial setting is “θ0 ₁ ”, the additional printing unit plate when the register mark is detected by the register sensor and the mark sensor 29 on the additional printing unit plate cylinder. The phase difference “θ” with the trunk phase angle is
θ = θ _M -θ0 ₁
It becomes.
[0030]
Therefore, when the mark sensor 29 detects the register mark of the original web, the movement angle of the additional printing unit plate cylinder 7, that is, the correction angle “θ” is obtained by the above calculation, and then the plate cylinder 7 is moved by “θ” degrees. , Speed override, and phase shift. At this time, it is preferable that the speed override value is smoothly changed according to the phase shift amount, such as a ramp shape, to the extent that there is no paper breakage of the original sheet. Further, the speed override value may be a negative value instead of the positive value.
[0031]
Further, fine adjustment during the additional printing operation is performed by adjusting the position of the register correcting roller by an automatic register adjusting device (not shown) based on a predetermined register mark on the printed web, thereby maintaining desired registerability. .
[0032]
Further, when the printed web is added and used, the next printed web is added by an automatic paste device (paper splicing device; not shown), and additional printing is continuously performed. At this time, since the initial setting of the register mark phase on the printing unit plate cylinder has already been performed, the operation is omitted, and the process is performed in the same manner as the above-described process at the start of printing.
[0033]
In general printing, a register correcting mechanism is not provided for the first color, and a register adjusting sensor is not provided between the first color and the second color. However, in the present embodiment, by providing them, a predetermined register mark of the raw material is used as a reference. And register maintenance becomes possible.
[0034]
According to this embodiment, the following effects can be obtained.
(1) When additional printing is started, the register mark position of the original is detected by the register mark sensor 29, and the phase between this position and the rotational position of the plate cylinder 7 is calculated by the DSP unit 21, and the plate cylinder is calculated. Is obtained as the phase correction angle “θ”, the speed of the plate cylinder 7 is overridden, and adjustment is made to change by the plate cylinder phase correction angle “θ”. You don't have to. As a result, it is possible to suppress a large amount of waste paper and time loss.
[0035]
(2) In the case of additional printing, in which the raw material wound around the unwinding unit 3 is insufficient and the raw material on which the same pattern as that of the raw material is printed is automatically added, a signal at the time of paper splicing is triggered. As a result, the plate cylinder phase correction angle “θ” is obtained, and the speed of the plate cylinder 7 is overridden, and an adjustment for changing the plate cylinder phase correction angle “θ” is performed. It is not necessary to stop the printing and perform the additional printing for the first printing, thereby making it possible to suppress much more waste paper and time loss.
[0036]
(3) During the reprint printing, the register mark of the original sheet can be used as a reference mark at the time of print register adjustment. Since the register mark of the original sheet has already been adjusted, the register can be easily maintained. .
[0037]
As a position detector for detecting the rotational speed and phase of the (4) plate cylinder 7, so the encoder 12 ₁ to 12 ₆ as a position detector for the motor is shared, each position detector for a motor and the plate cylinder the It is not necessary to provide them, and the number of components can be reduced.
[0038]
Note that the present invention is not limited to the above embodiment, and includes the following modified embodiments as long as the object of the present invention can be achieved.
For example, in the above embodiment, as a detector for detecting the position of the plate cylinder 7, but using the encoder 12 ₁ to 12 ₆ that comes with the servo motor 10 ₁ to 10 _6, be provided with a separate position detector Good.
[0039]
Further, the tension control unit 25 is not limited to the configuration of the above-described embodiment, and may have any configuration as long as it can provide a desired tension to the web.
Further, the impression cylinder 8 has a structure in which the impression cylinder 8 is in contact with the web and rotates as the web travels. However, this is also driven independently for each printing unit similarly to the plate cylinder 7, and these are synchronously controlled by the DSP unit 21. You may make it.
[0040]
Further, the guide roller 9 also has a structure in which the guide roller 9 is in contact with the web and rotates as the web travels. However, the guide roller 9 is also allowed to rotate independently, and is synchronized with the peripheral speeds of the plate cylinder 7 and the impression cylinder 8. You may make it do. In this case, the guide roller 9 and the plate cylinder 7 or the guide roller 9 and the impression cylinder 8 may be connected to each other, and the drive source of the plate cylinder 7 or the impression cylinder 8 may be used as the drive source of the guide roller 9.
[0041]
【The invention's effect】
As described above, according to the additional printing apparatus for a printing press of the present invention, register adjustment can be automatically performed at the start of additional printing, and a large amount of waste paper and time loss can be suppressed.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing a gravure rotary printing press according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a control system of the rotary printing press of the embodiment.
FIG. 3 is a diagram showing a mutual relationship between a register mark sensor, a printing unit plate cylinder, and an impression cylinder contact portion of the embodiment.
FIG. 4 is a view showing angles from an origin on a printing unit plate cylinder of the embodiment and a phase relationship with an original sheet.
[Explanation of symbols]
1 printing machine ₂ 1 to 2 ₆ printing unit 3 turns out portion (web supply section)
4 Infeed section 5 Outfeed section (web winding mechanism)
6 Rewinding part 7 Plate cylinder 8 Impression cylinder 9 Guide rollers 10 ₁ to 10 ₆ Servo motor for plate cylinder drive (motor for plate cylinder drive)
12 _{1 to} 12 ₆ encoder (position detector)
21 DSP unit (Integrated control unit)
23 _{1-23 6} plate cylinder servo controller ₃₀ 1 to 30 ₆ plate cylinder servo amplifier ₃₂ 1-32 ₆ plate cylinder for position loop

Claims (4)

A plurality of printing units each having a plate cylinder, an impression cylinder, a guide roller and a plate cylinder driving motor for driving the plate cylinder and arranged in a line, and a web supply mechanism for supplying a web to the plurality of printing units. A web take-up mechanism for winding up the web, and an additional printing device for a printing press comprising an integrated control unit for synchronously driving a plate cylinder driving motor of the plurality of printing units;
The integrated control unit, a position detector that detects the rotation speed and phase of the plate cylinder,
Register mark detecting means provided upstream of the plate cylinder of the printing unit that performs the first color printing in the plurality of printing units, and detecting a register mark of a raw material mounted on the web supply mechanism,
At the start of additional printing, after performing an initial phase adjustment between the respective plate cylinders of the plurality of printing units, a signal of the register mark position of the raw material detected by the register mark detecting means, and a rotation position of the plate cylinder Is obtained in advance as a plate cylinder phase correction angle from the distance between the input plate cylinder / impression cylinder contact portion and the mark detecting means and the plate cylinder length, and the register mark position is obtained. A printing press for a printing press, wherein the plate cylinder phase is changed by the plate cylinder phase correction angle by changing the plate cylinder drive speed in response to the signal of (1). The reprinting device for a printing press according to claim 1,
At the time of automatic splicing in which the printed web is automatically spliced, a signal at the time of splicing is used as a trigger, and a signal of a register mark position of the raw material detected by the register mark detecting means, and rotation of the plate cylinder The phase between the signal of the position and the position of the contact between the plate cylinder / impression cylinder and the mark detection means and the length of the plate cylinder are determined in advance as a plate cylinder phase correction angle. An additional printing apparatus for a printing press, wherein a plate cylinder phase is changed by a plate cylinder phase correction angle by changing a plate cylinder driving speed in response to a position signal. The additional printing device for a printing press according to claim 1 or 2,
A reprinting apparatus for a printing press, wherein the register mark of the original is used as a reference mark at the time of printing register adjustment while the reprint printing is continued. The additional printing device for a printing press according to claim 2 or 3,
The plate cylinder driving motor of each of the printing units includes a motor position detector that detects a rotation speed and a phase of the motor, and a position detector that detects the rotation speed and the phase of the plate cylinder includes the motor position detector. An additional printing device for a printing press, wherein the printing press is shared.

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