JP4467244B2 - Reprinting device for printing press - Google Patents

Description

[0001]
BACKGROUND 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 an original fabric (printed web).
[0002]
[Background]
Conventionally, in gravure printing or the like, additional printing (reprinting) is sometimes performed on the original fabric.
This additional printing is performed, for example, when the same pattern and a partially different printed material is required, such as a description of a store name, a manufacturer name, and a weighing for manufacturing. In this case, printing excluding different character portions and the like is collectively performed in advance, and the total amount is completed. If necessary, a plate cylinder in which only different portions are made is used, and is again applied to the printing press.
[0003]
By the way, in gravure printing for packaging, for example, an easily stretchable film is often used as a web. In this case, printing of the second color is performed after printing of the first color, registration in both printings is performed, and then 3 Registration of color and fourth colors is performed to correct a registration error by, for example, adjusting a web path, thereby eliminating a printing error.
In addition, in the case of reprinting, it is difficult to completely reproduce the stretched state of the web, which has already been printed and dried, even if almost the same tension can be reproduced for preprinting and reprinting. Also, because of the manufacturing error of the plate cylinder circumference for reprinting, etc., the plate cylinder circumferential pitch for reprinting and the printing pitch in the stretched state with tension applied to the preprinted web are the same. It is difficult to let
[0004]
Conventionally, a registration operation for aligning a registration mark at the time of reprinting with a registration mark of a preprinted web is first provided on the side for supplying the web to the printing unit that performs overprinting and the side for winding the web. After performing rough adjustment by adjusting the tension of the infeed portion and the outfeed portion, additional printing is performed once in this state. Then, compare the actual overprinted mark with the preprinted web register mark, and use the register correction roller to make fine adjustments by increasing or decreasing the web path length to the plate cylinder. The printing register is adjusted (for example, Patent Document 1). In addition, when printing by using a preprinted web, the printing press is stopped once at the time of paper splicing, and after additional printing is performed once, as described above, the actual printing register and preprinting are performed. After confirming the registration mark, the initial printing registration is adjusted using a registration correction roller or the like.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-117950
[Problems to be solved by the invention]
However, the registration work by the registration correction roller is performed once on the preprinted web, and then the actual overprinted web is compared with the register mark on the preprinted web. Since the fine adjustment is performed by increasing / decreasing the web path length with respect to, there is a problem that a large amount of waste paper is generated before the registration marks for the first printing and the additional printing are matched.
In addition, when printing by using a preprinted web, it is necessary to stop the press once and perform additional printing even though additional printing is normally performed. There is a problem that it takes a lot of time as it occurs.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a reprinting device for a printing press that can automatically perform registration adjustment at the start of reprint printing and can suppress a large amount of paper loss and time loss.
[0008]
[Means for Solving the Problems]
A reprinting apparatus for a printing press according to claim 1 of the present invention includes a plate cylinder, an impression cylinder, a guide roller, and a plate cylinder driving motor for driving the plate cylinder, and a plurality of printings arranged in a line. A unit, a web supply mechanism that supplies webs to the plurality of printing units, a web winding mechanism that winds the webs, and an integrated control unit that synchronously drives plate cylinder driving motors of the plurality of printing units. In the reprinting apparatus for a printing press, the integrated control unit includes a position detector that detects a rotational speed and a phase of the plate cylinder, and a plate cylinder of the printing unit that performs the first color printing in the plurality of printing units. provided upstream, in the provided with register mark detecting means for detecting the register mark of the original is mounted on the web supply mechanism counter, the initial setting of the plate cylinder on the register mark phase before Symbol plurality of printing units After we input line of the angle from the origin of that plate cylinder on register marks, by the integrated control unit, it starts the overprinting printing, upon detection of a register mark position of the raw by the register mark detection means and rotational position of the plate cylinder, and the distance of the raw fabric between the plate cylinder, impression cylinder contact portion and said mark detecting means which are input in advance, a plate cylinder circumference of the plate cylinder which are input in advance The plate cylinder phase correction angle is obtained from the rotation position of the plate cylinder at the time of initial setting that is input in advance , and the plate cylinder phase is changed with respect to the signal of the register mark position, and the plate cylinder driving speed is changed. The plate cylinder phase correction angle is changed.
Here, the register mark is not limited to the mark printed for alignment, but includes a specific part of the pattern printed on the web.
The original fabric means a printed web, that is, a preprinted web.
[0009]
According to this configuration, when the reprint printing is started, the registration mark position of the original fabric is detected by the registration mark detection means, and the rotational position of the plate cylinder when the registration mark detection position of the original fabric is detected by the registration mark detection means The plate cylinder phase correction angle is obtained from the distance between the plate cylinder / impression cylinder contact section and the mark detection means, the plate cylinder circumference of the plate cylinder, and the rotation position of the plate cylinder at the initial setting. The speed of the plate cylinder is changed by this plate cylinder phase correction angle for adjustment.
Therefore, it is not necessary to perform additional printing once for pre-printing printing, and it is possible to suppress a large amount of paper loss and time loss.
[0010]
In the above present invention, the in the automatic web splicing used in replenishing raw automatically, the signal at the time of web splicing as a trigger to detect the register mark position before Kihara anti Ri by the register mark detection means The rotational position of the plate cylinder, the distance between the plate cylinder / impression cylinder contact portion and the mark detection means, the plate cylinder circumference of the plate cylinder, and the plate cylinder at the time of the initial setting It is desirable to obtain the plate cylinder phase correction angle from the rotational position of the plate cylinder , and to change the plate cylinder phase with respect to the registration mark position signal by changing the plate cylinder phase correction angle by changing the plate cylinder driving speed.
[0011]
According to this configuration, in the case of reprinting using the original fabric automatically added, the plate cylinder phase correction angle is obtained by using a signal at the time of paper splicing as a trigger, and the speed of the plate cylinder is equal to the plate cylinder phase correction angle. Changed and adjusted.
Therefore, it is not necessary to stop the printing machine once at the time of paper splicing, and it is not necessary to carry out reprint printing with respect to pre-printing printing, which makes it possible to further suppress a large amount of paper loss and time loss. .
[0012]
Further, it is preferable that the register mark of the original fabric is used as a reference mark at the time of print registration adjustment during the continuous printing.
According to this configuration, since the registration mark of the original fabric has already been registered, the registration can be easily maintained by using this registration mark as a reference mark at the time of printing registration adjustment.
[0013]
Further, the plate cylinder driving motor of each printing unit includes a motor position detector for detecting the rotation speed and phase of the motor, and the position detector for detecting the rotation speed and phase of the plate cylinder is for the motor. It is desirable that the position detector is shared.
According to this configuration, since the rotation speed and phase of the plate cylinder driving motor and the rotation speed and phase of the plate cylinder can be detected by the motor position detector, the position detector for the motor and the plate cylinder respectively. Thus, the number of parts can be reduced.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a six-line straight gravure rotary printing press to which a reprinting device for a printing press according to the present invention is applied.
This gravure rotary printing machine 1 includes six printing units 2 ₁ to 2 ₆ arranged in a line, and performs straight printing (web is continuously passed through these printing units 2 ₁ to 2 ₆ for printing. ), And a function for performing additional printing using the printing units 2 ₁ and 2 ₂ for the first and second colors, for example.
[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 ), An outfeed unit 5 and a winding unit 6 as a web winding mechanism are arranged.
[0016]
Each of the printing units 2 _{1 to} 2 ₆ is provided with a plate cylinder 7, an impression cylinder 8, and a plurality of rotation-free guide rollers 9 that constitute a printing unit. Each of the printing units 2 _{1 to} 2 ₆ is provided with servo motors 10 ₁ to 10 ₆ for driving the plate cylinder 7 via transmission gears (not shown), etc., and these servo motors 10 ₁ to 10 ₆ are provided. ₆ , the plate cylinders 7 provided in the printing units 2 ₁ to 2 ₆ can 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 is like that.
Accordingly, these encoders 12 _{1 to} 12 ₆ have a function as a position detector that detects 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 device 20 includes a DSP (digital signal processor) unit 21 that operates as an integrated control unit, a memory unit 22 that stores various data, plate cylinder servo controllers (control circuits) 23 ₁ to 23 ₆ , A tension control unit 25 and an input / output I / F (interface) unit 26 are included.
[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 of the pattern) of the original fabric (printed web). A mark sensor 29 as a registration mark detecting means is connected to each other.
The plate cylinder servo controllers 23 ₁ to 23 ₆ correspond to all the servo motors 10 ₁ to 10 ₆ provided in the printing units 2 ₁ to 2 ₈ .
[0019]
The memory unit 22 stores the distance L _S between the position of the mark sensor 29 input by the input device 27 and the joint between the plate cylinder 7 and the impression cylinder 8 and the like, and is additionally printed. Various data such as the number of the printing unit is stored.
[0020]
When the distance L _S between the position of the mark sensor 29 and the joint between the plate cylinder 7 and the impression cylinder 8 is input from the input device 27, the DSP unit 21 stores these data in the memory unit 22. Further, when an operation command and a speed command are given from the printing press control device 40, a single position command (rotation angle) signal is simultaneously given to each of the plate cylinder servo controllers 23 ₁ to 23 _{6 of} the printing unit.
Further, a position command signal is given to a printing unit for performing additional printing.
[0021]
Further, the DSP unit 21 maintains a time interval according to the speed command during constant speed operation, and continuously transmits position command signals to the servo controllers 23 ₁ to 23 ₆ . At this time, the synchronization of the plate cylinders 7 is maintained by the software synchronization of the DSP unit 21. When accelerating and decelerating, the position command signal is continuously transmitted while maintaining the rate of change according to the acceleration time and the deceleration time according to a predetermined angular acceleration, that is, the synchronism of each plate cylinder 7 by software synchronization of the DSP unit 21. To maintain.
[0022]
The plate cylinder servo controllers 23 ₁ to 23 ₆ receive a speed command signal from the DSP unit 21 as a 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 The rotation angle signals from 12 _{1 to} 12 ₆ are input to the servo controllers 23 ₁ to 23 ₆ as position feedback signals. The plate cylinder servo controllers 23 ₁ to 23 ₆ constitute position loops 32 _{1 to} 32 ₆ having a fixed cycle (servo system sampling cycle), and have a software servo function for controlling each servo system.
[0023]
The tension control unit 25 is synchronously driven by a speed signal from the DSP unit 21 in synchronization with generation of a command signal to the plate cylinder servo controllers 23 ₁ to 23 ₆ . That is, the tension control unit 25 performs web tension control based on the tension control command signal from the DSP unit 21.
[0024]
In the above configuration, for example, if the second and second color printing units 2 ₁ and 2 ₂ perform additional printing, only these additional printing units 2 ₁ and 2 ₂ are driven, and the remaining printing units 2 ₃ are driven. to 2 ₆ is stored in the memory unit 22 is set so as not to drive.
Thereafter, the web is mounted on the unwinding unit 3, and the web is wound on the winding unit 6 through the printing units 2 ₁ to ₂₆ .
[0025]
Next, an initial setting of the registration mark phase on the printing unit plate cylinder between the _first and second color printing units 2 ₁ and 2 ₂ is performed, and then overprint printing is started.
Here, the registration mark position angle on the first color plate cylinder when the initial setting is performed is “θ0 ₁ ”, and the registration mark position angle on the second color plate cylinder is “θ0 ₂ ”. “Θ0 ₃ ”, the fourth color is “θ0 ₄ ”, the fifth color is “θ0 ₅ ”, and the registration mark position angle on the sixth color plate cylinder is “θ0 ₆ ”.
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 defined as “θ _R ” (see FIG. 4).
[0027]
Here, as shown in FIG. 3, an original length between the plate cylinder / impression cylinder contact portion and the mark sensor 29 is “L _S ”, and a plate cylinder circumferential length (repeat length) is “L _P ”.
Furthermore, if “θ _P ” is the phase difference between the “θ _R ” position on the plate cylinder and the predetermined register mark on the original fabric,
θ _P = 2π * (L _S % L _P )
It becomes. However,% is an operator for calculating the remainder.
[0028]
However, the registration mark position on the plate cylinder of the reprint printing unit and the registration mark of the original fabric match or maintain a predetermined distance at the plate cylinder / impression cylinder contact (shift the predetermined distance to avoid overlapping marks). Therefore, the movement amount (angle) “θ” for moving the plate cylinder phase to the coincidence position is obtained.
When the phase from the plate cylinder origin to the predetermined register mark of the original fabric is expressed by 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 reprint printing unit at the initial setting is “θ0 ₁ ”, the reprint printing unit plate when the register mark is detected by the register mark position on the reprint printing unit plate cylinder and the mark sensor 29 is used. The phase difference "θ" with the trunk phase angle is
θ = θ _M −θ0 ₁
It becomes.
[0030]
Therefore, when the registration mark of the original fabric is detected by the mark sensor 29, the movement angle of the follow-up 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. It is sufficient to give a speed override and perform a phase shift. At this time, it is preferable that the speed override value is changed gently according to the phase shift amount so as to have a lamp shape to the extent that there is no occurrence of sheet breakage. The speed override value may be a negative value as well as a positive value.
[0031]
In addition, the fine adjustment during the reprint printing operation maintains the desired registration by adjusting the position of the registration correction roller by an automatic registration adjustment device (not shown) based on a predetermined registration mark of the printed web. .
[0032]
Furthermore, when the printed web is added and used, the next printed web is added by an automatic paste device (paper joining device; not shown), and the overprint printing is continued. At this time, since the initial setting of the registration 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 registration correction mechanism is not provided for the first color, and a registration adjustment sensor is not provided between the first and second colors. However, in this embodiment, by providing them, a predetermined registration mark of the original fabric is used as a reference. It is possible to maintain the register.
[0034]
According to this embodiment, there are the following effects.
(1) When reprint printing is started, the register mark sensor 29 detects the register mark position of the original fabric, 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 detected. Obtained as the phase correction angle “θ”, an override is given to the speed of the plate cylinder 7 and adjustment is performed to change the plate cylinder phase correction angle “θ”. You do n’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 reprinting that automatically uses the original fabric on which the same pattern as the original fabric is printed because the original fabric wound around the unwinding section 3 is insufficient, the signal at the time of paper splicing is triggered Since the plate cylinder phase correction angle “θ” is obtained, an override is given to the speed of the plate cylinder 7 and adjustment is performed to change the plate cylinder phase correction angle “θ”. It is not necessary to stop printing and follow-up printing with respect to pre-printing printing, which makes it possible to further suppress a large amount of paper loss and time loss.
[0036]
(3) While reprint printing is ongoing, the register mark of the original fabric can be used as a reference mark when adjusting the print register, and the register mark of the original fabric has already been adjusted, so it is easy to maintain the register. .
[0037]
(4) As the position detector for detecting the rotational speed and phase of the plate cylinder 7, the encoders 12 _{1 to} 12 ₆ as motor position detectors are commonly used. It is not necessary to provide this, so that the number of parts can be reduced.
[0038]
In addition, this invention is not limited to the said embodiment, As long as the objective of this invention can be achieved, the modification as shown below is also included.
For example, in the above-described embodiment, the encoders 12 _{1 to} 12 ₆ attached to the servo motors 10 ₁ to 10 ₆ are used as detectors for detecting the position of the plate cylinder 7, but a position detector may be provided separately. Good.
[0039]
Further, the tension control unit 25 is not limited to the configuration of the above embodiment, and may be any configuration as long as it can apply a desired tension to the web.
The impression cylinder 8 has a structure in which the web contacts with the web and rotates according to the travel of the web. This is also driven independently for each printing unit in the same manner as the plate cylinder 7, and these are synchronously controlled by the DSP unit 21. You may make it do.
[0040]
Further, the guide roller 9 also has a structure that contacts the web and rotates according to the travel of the web. However, these guide rollers 9 can also be rotated independently and synchronized with the peripheral speeds of the plate cylinder 7 and the impression cylinder 8. You may make it make it. 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, 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 reprinting device for a printing press of the present invention, it is possible to automatically perform registration adjustment at the start of reprinting printing, and it is possible to suppress a large amount of paper loss and time loss.
[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 according to the embodiment.
FIG. 3 is a diagram showing a mutual relationship between the register mark sensor of the embodiment, a printing unit plate cylinder, and an impression cylinder contact portion.
FIG. 4 is a diagram showing a phase relationship between each angle from the origin and the original fabric on the printing unit plate cylinder of the embodiment.
[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 Winding part 7 Plate cylinder 8 Impression cylinder 9 Guide rollers 10 ₁ to 10 ₆ Plate cylinder drive servo motor (plate cylinder drive motor)
12 _{1 to} 12 ₆ encoder (position detector)
21 DSP unit (integrated control unit)
23 ₁ to 23 ₆ plate cylinder servo controller 30 ₁ to 30 ₆ plate cylinder servo amplifier 32 _{1 to} 32 ₆ plate cylinder 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 a web supply mechanism for supplying webs to the plurality of printing units; In a reprinting apparatus for a printing press comprising a web winding mechanism for winding the web, and an integrated control unit that synchronously drives plate cylinder driving motors of the plurality of printing units.
The integrated control unit includes a position detector that detects a rotation speed and a phase of the plate cylinder,
A registration mark detection unit that is provided upstream of the plate cylinder of the printing unit that performs printing of the first color in the plurality of printing units, and that detects a registration mark of the original fabric mounted on the web supply mechanism,
After we input line of the angle from the origin of the plate cylinder on the register mark is the initial setting of the plate cylinder on the register mark phase before Symbol plurality of printing units, by the integrated control unit, it starts the overprinting printing, The rotation position of the plate cylinder when the registration mark detection position of the original fabric is detected by the registration mark detection means, and the original fabric between the plate cylinder / impression cylinder contact portion and the mark detection means that are input in advance . the distance, the pre-plate cylinder of the plate cylinder being input circumference, the rotational position of the plate cylinder of the initial setting which are input in advance, obtains a color plate cylinder phase correction angle, of the register mark position A reprinting 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 with respect to a signal. In the reprint apparatus for a printing press according to claim 1,
When automatic paper splicing is performed by automatically adding the original fabric, a rotation position of the plate cylinder when the registration mark detection means detects the registration mark position of the original fabric using a signal at the time of the paper splicing as a trigger, and The plate cylinder phase from the distance between the plate cylinder / impression cylinder contact portion and the mark detection means, the plate cylinder circumference of the plate cylinder, and the rotational position of the plate cylinder at the initial setting A reprinting apparatus for a printing press characterized by obtaining a correction angle and changing the plate cylinder phase with respect to the register mark position signal by a plate cylinder phase correction angle by changing a plate cylinder driving speed. In the reprinting device for a printing press according to claim 1 or 2,
A reprinting device for a printing press, wherein the registration mark of the original fabric is used as a reference mark at the time of print registration adjustment while the reprint printing is continued. In the reprinting apparatus for a printing press according to claim 2 or 3,
The plate cylinder driving motor of each printing unit includes a motor position detector for detecting the rotation speed and phase of the motor, and the position detector for detecting the rotation speed and phase of the plate cylinder is a position detection for the motor. A reprinting device for a printing press characterized in that the device is shared.

Images