JP2011201131A - Gravure printing machine and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gravure printing machine which suppresses a magnitude of registration slur within an allowance when printing speed is increased or decreased from a normal state, and also to provide a control method of the machine.SOLUTION: For increasing/decreasing rotation speeds of plate cylinders 11a, 11b, 11c of respective printing units 10a, 10b, 10c, if the rotation speeds are magnitudes within a predetermined range set in advance, a correction amount of a predetermined magnitude set in advance is added to calculated control amounts of respective compensator rollers 14b, 14c when positions of the respective compensator rollers 14b, 14c are adjusted. On the other hand, if the rotation speeds of the plate cylinders 11b, 11c are out of the predetermined range set in advance, the rotation speeds of the plate cylinders 11a, 11b, 11c of the respective printing units 10a, 10b, 10c are adjusted without adding the correction amount to the calculated control amounts of the compensator rollers 14b, 14c. At this time, a print speed condition is switched so that the magnitude of the registration slur is within a predetermined range set in advance.

Description

  The present invention relates to a line shaft type gravure printing machine that performs printing on a continuously conveyed web and a control method thereof, and in particular, when the printing speed is increased or decreased from a steady state, the size of misregistration is within an allowable range. The present invention relates to a line shaft type gravure printing machine capable of increasing or decreasing a printing speed in a short period while suppressing the pressure inside, and a control method thereof.

  As a gravure printing machine, multiple (for example, three) printing units that perform multicolor printing on webs such as film and paper, drive units that drive each printing unit, and vertical and horizontal registration of each printing unit A device having a register control device to be controlled is known (for example, see Patent Document 1).

  In such a gravure printing machine, registration control is performed by changing the printing pitch by causing a change in web tension between printing units. However, if the registration control is performed when the printing speed of the gravure printing machine is increased or decreased from the steady state, there is a possibility that a registration deviation that is unacceptable as a non-defective product (a registration deviation of ± 0.2 mm or more) may occur. In order to solve such problems, for example, methods disclosed in Patent Documents 2 to 4 are known.

  More specifically, Patent Document 2 discloses a method in which registration control is stopped when the printing speed is increased or decreased from a steady state, and registration control is performed again after completion of the increase or decrease to the target printing speed. Is disclosed. Further, Patent Document 3 discloses that a value obtained by multiplying a printing speed and a multiplier of increasing / decreasing speed by a constant specific to the conveyance line due to the elongation of the printing substrate, the arrangement of the free rolls, and the moment of inertia. There is disclosed a method for suppressing fluctuations in web tension during increase / decrease in printing speed by correcting the angle of the plate cylinder by the value divided by the length. Further, in Patent Document 4, when the printing speed is in a steady state, control that combines register control and tension control that controls the web tension between printing units so as not to fluctuate is performed. Discloses a method in which the register control is stopped, and the control combining the register control and the tension control is performed again after the increase or decrease to the target printing speed is completed.

JP 2004-66577 A Japanese Patent Application Laid-Open No. 11-129452 JP 2003-80679 A JP 2006-76036 A

  However, the method disclosed in Patent Document 2 relates to how quickly the misregistration is corrected after the misregistration occurs. Although the misregistration can be reduced as compared with the conventional method, the method is still unregistered. The deviation may not be suppressed within a range acceptable as a non-defective product. In addition, the method disclosed in Patent Document 3 merely tries to suppress the tension of the web without confirming the misregistration. Therefore, the misregistration can be reduced as compared with the conventional method, but it is still a register. The deviation may not be suppressed within a range acceptable as a non-defective product. In addition, the method disclosed in Patent Document 4 merely tries to suppress the tension of the web without confirming the misregistration. Therefore, although the misregistration can be reduced as compared with the conventional method, it is still a register. The deviation may not be suppressed within a range acceptable as a non-defective product.

  Also, without using the method as described above, it is possible to suppress misregistration by making the printing speed increase / decrease condition extremely gentle. However, in this case, the productivity of the gravure printing machine is extremely deteriorated, which is not a realistic method.

  The present invention has been made in consideration of such points, and when the printing speed is increased or decreased from the steady state, in addition to the control in the steady state, the rotation speed of the plate cylinder is within a predetermined range. A gravure printing machine capable of increasing or decreasing the printing speed in a short period of time while suppressing the size of the register deviation within an allowable range by adding a correction amount to the control amount of the compensator roller in a feedforward manner. An object is to provide a control method.

  The gravure printing machine of the present invention is provided in series with a front printing unit having a plate cylinder that applies printing to a continuously conveyed web and attaches a registration mark to the web, and downstream of the front printing unit. A plurality of post-printing units, each post-printing unit printing a web and applying a register mark to the web, and detecting a register mark provided on the downstream side of the plate cylinder on the web Detected by a registration mark detection sensor and a post-printing unit provided upstream of the plate cylinder and a compensator roller for registering the web sent to the plate cylinder, and a registration mark detection sensor of one post-printing unit A register mark on the web by the plate cylinder of one post-printing unit, and immediately upstream of the one post-printing unit The amount of misregistration between the registration marks attached by the plate cylinder of the preceding printing unit or other succeeding printing unit is calculated, and the compensator roller of one succeeding printing unit is calculated based on this misregistration size. A control device that calculates a control amount and controls the compensator roller of one post-stage printing unit based on the calculated control amount of the compensator roller, and adjusts the position thereof. When the rotational speed of the plate cylinder of the printing unit is increased or decreased and the rotational speed is within a predetermined range, the position of the compensator roller of the subsequent printing unit is controlled and adjusted. Then, a correction amount having a predetermined size is added to the calculated control amount of the compensator roller, and (b) the rotational speed of the plate cylinder of each printing unit is set. When the rotational speed of the plate cylinder deviates from a preset predetermined range during the reduction, each printing unit does not add a preset correction amount to the calculated compensator roller control amount. The rotational speed of the plate cylinder is adjusted, and at this time, the printing speed is changed to a printing speed condition in which the size of the registration deviation is within a predetermined range set in advance.

  The control method of the gravure printing machine of the present invention includes a front-stage printing unit having a plate cylinder that applies printing to a web that is continuously conveyed and attaches a registration mark to the web, and a downstream side of the front-stage printing unit in series. A plurality of succeeding-stage printing units, wherein each succeeding-stage printing unit prints a web and attaches a register mark to the web; and a register mark on the web provided downstream of the plate cylinder In a control method of a gravure printing machine, comprising: a registration mark detection sensor for detecting the position and a post-printing unit having a compensator roller provided on the upstream side of the plate cylinder and configured to register a web sent to the plate cylinder, Detected by the plate cylinder of one post-printing unit on the web detected by the registration mark detection sensor of one post-printing unit Calculating the amount of misregistration between the mark and the registration mark attached by the plate cylinder of the preceding printing unit or the other succeeding printing unit located immediately upstream of one succeeding printing unit; and A step of calculating a control amount of a compensator roller of one post-stage printing unit based on the size of the misregistration, and a control of the compensator roller of one post-stage printing unit based on the calculated control amount of the compensator roller Adjusting the position, and when increasing or decreasing the rotational speed of the plate cylinder of each printing unit, when the rotational speed is within a predetermined range, the compensator roller of the latter-stage printing unit When adjusting the position by controlling the control, a predetermined amount of correction that is preset to the calculated control amount of the compensator roller When the rotational speed of the plate cylinder is out of a predetermined range when the rotational speed of the plate cylinder of each printing unit is increased or decreased, a predetermined preset value is set to the calculated control amount of the compensator roller. The rotational speed of the plate cylinder of each printing unit is adjusted without adding a correction amount of the size of the printing unit, and at this time, the size of the registration deviation is switched to a printing speed condition that is within a predetermined range. It is characterized by that.

  According to such a gravure printing machine and the control method of the gravure printing machine, when the printing speed is increased or decreased from the steady state, in addition to the control in the steady state, the rotation speed of the plate cylinder is set to a size within a predetermined range. In some cases, by adding a correction amount to the control amount of the compensator roller in a feed-forward manner, it is possible to increase or decrease the printing speed in a short period while suppressing the size of the registration deviation within an allowable range. In addition, for a gravure printing machine having a different target production speed for each item, a desired registration control can be performed simply by setting a predetermined amount of correction and a predetermined range for one pattern.

  In the gravure printing machine of the present invention, when the control device increases or decreases the rotational speed of the plate cylinder of each printing unit, when the rotational speed reaches a predetermined set speed within a predetermined range set in advance. It is preferable to add a predetermined correction amount to the calculated control amount of the compensator roller. In the control method of the gravure printing machine of the present invention, when the rotational speed of the plate cylinder of each printing unit is increased or decreased, when the rotational speed reaches a predetermined set speed within a predetermined range set in advance. In addition, it is preferable to add a correction amount having a predetermined size to the calculated control amount of the compensator roller.

  According to the gravure printing machine and its control method of the present invention, when the printing speed is increased or decreased from the steady state, the printing speed can be increased or decreased in a short period while suppressing the size of the registration error within an allowable range.

It is a figure which shows the structure of the gravure printing machine of one embodiment of this invention. It is a block diagram which shows the control content by the control apparatus of the gravure printing machine of FIG. It is a calculation formula of the control amount of the compensator roller of each printing unit of the gravure printing machine of FIG. 1 shows the relationship between the time (horizontal axis) and the rotational speed (vertical axis) of the plate cylinder when the rotational speed of the printing cylinder of the printing unit is increased from 50 m / min to 150 m / min in the gravure printing machine of FIG. It is a graph which shows the relationship between a graph and time (horizontal axis) and the magnitude | size of a misregistration (vertical axis). In the comparative example, the graph showing the relationship between the time (horizontal axis) and the rotational speed (vertical axis) of the plate cylinder when the rotational speed of the printing cylinder of the printing unit is increased from 50 m / min to 150 m / min, and the time It is a graph which shows the relationship between (horizontal axis) and the magnitude | size of a registration gap (ordinate).

Embodiments of the present invention will be described below with reference to the drawings.
1 to 3 are views showing an embodiment of a gravure printing machine according to the present invention. Among these, FIG. 1 is explanatory drawing which shows the structure of the gravure printing machine of this Embodiment, and FIG. 2 is a block diagram which shows the control content by the control apparatus of the gravure printing machine of FIG. FIG. 3 is a calculation formula for the control amount of the compensator roller of each printing unit of the gravure printing machine of FIG.

  The gravure printing machine shown in FIG. 1 has an infeed unit 40 that applies tension to a web W such as a film or paper that is continuously conveyed in the direction of the arrow, and a web W that is conveyed from the infeed unit 40. A plurality of, for example, three printing units 10a, 10b, and 10c for printing different colors are provided. In this case, the first printing unit 10a is a first color printing unit, the second printing unit 10b is a second color printing unit, and the third printing unit 10c is a third color printing unit. Moreover, this gravure printing machine has the control apparatus 30 which controls each printing unit 10a, 10b, 10c.

  The in-feed unit 40 is provided on the downstream side of the in-feed roller 41, the nip roller 43 that sandwiches the web W between the in-feed roller 41 and the in-feed roller 41, and is reciprocated in the direction of the arrow in FIG. And a dancer roller 42 which is free. A motor 45 that rotates the infeed roller 41 is connected to the infeed roller 41. The dancer roller 42 is connected to an air cylinder (not shown) that reciprocates the dancer roller 42 in the direction of the arrow in FIG.

  The web W sent to the infeed unit 40 is pinched between the infeed roller 41 and the nip roller 43. Further, by changing the speed of the infeed roller 41, a speed difference is generated between the infeed roller 41 and a plate cylinder 11a (described later) of the first color printing unit 10a, and the tension of the web W is changed. It has become so. Further, the tension of the web W can also be changed by adjusting the position of the dancer roller 42.

  The first printing unit (previous printing unit) 10a includes a printing cylinder 11a and an impression cylinder 12a that performs printing while holding the web W between the printing cylinder 11a. When printing is performed, the plate cylinder 11a attaches a first register mark to the web W.

  The second and third printing units (back printing units) 10b and 10c have substantially the same configuration, and the web W between the printing cylinders 11b and 11c and the printing cylinders 11b and 11c, respectively. Are provided with impression cylinders 12b and 12c for printing. When printing is performed on the web W in each of the printing units 10b and 10c, the plate cylinders 11b and 11c are provided with second and third registration marks on the web W, respectively.

  In each of the printing units 10b and 10c, compensator rollers 14b and 14c are provided on the upstream side of the plate cylinders 11b and 11c. When the positions of the compensator rollers 14b and 14c change, the amount of tension applied to the web W sent to the plate cylinders 11b and 11c is adjusted to perform printing registration. Each of the printing units 10b and 10c further includes registration mark detection sensors 15b and 15c that are provided on the downstream side of the plate cylinders 11b and 11c and detect registration marks on the web W, respectively. Here, the registration mark detection sensor 15b detects the first registration mark and the second registration mark on the web W, and the registration mark detection sensor 15c detects the second registration mark and the third registration mark on the web W. A mark is detected.

  The compensator rollers 14b and 14c are driven by the compensator motors 16b and 16c connected to the compensator rollers 14b and 14c, respectively, and the positions thereof are changed. Each of the compensator motors 16b and 16c is supplied with a control amount signal for each of the compensator rollers 14b and 14c from a register controller 30a of the controller 30 described later.

  The drive unit 20 includes a line shaft 21 connected to the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c, and a drive motor 22 that is connected to the line shaft 21 and drives the line shaft 21. ing. The drive motor 22 drives the line shaft 21 to rotationally drive the plate cylinders 11a, 11b, 11c.

  As shown in FIG. 1, the control device 30 includes a register controller 30a connected to the compensator motors 16b and 16c and the register mark detection sensors 15b and 15c of the second and third printing units 10b and 10c, and a register controller 30a. A control gain setting means 30b connected to the drive motor 22, and a plate cylinder drive controller 30c connected to the drive motor 22 for controlling the drive motor 22; and a correction amount setting device 30d connected to the register controller 30a. Yes.

  The register controller 30a calculates control amounts of the compensator rollers 14b and 14c based on signals of the register marks on the web W detected by the register mark detection sensors 15b and 15c.

The control gain setting means 30b is composed of, for example, a touch panel, and gives a command to the register controller 30a to set control contents by the register controller 30a. Specifically, the control gain k _p, as will be described later in this control gain setting unit _30b, and performs setting such as k _d.

  The plate cylinder drive controller 30c controls the drive motor 22 so that the plate cylinders 11a, 11b, and 11c rotate at a predetermined rotation speed.

  The correction amount setter 30d is configured to receive a rotational speed signal of each of the plate cylinders 11a, 11b, and 11c and a control amount signal of the compensator rollers 14b and 14c from the register controller 30a and the plate cylinder drive controller 30c. . The correction amount setting unit 30d selectively adds correction amounts to the control amounts of the compensator rollers 14b and 14c based on the rotational speeds of the plate cylinders 11a, 11b and 11c.

  Details of the control method by the control device 30 including the register controller 30a, the control gain setting means 30b, the plate cylinder drive controller 30c, and the correction amount setting unit 30d will be described later.

Next, the operation of the present embodiment having such a configuration will be described.
When the web W is conveyed to the gravure printing machine shown in FIG. 1, the web W is first sent to the infeed unit 40. In the infeed unit 40, the web W is pinched between the infeed roller 41 and the nip roller 43 of the infeed unit 40. Further, the tension of the web W is changed by adjusting the position of the dancer roller 42 or changing the speed of the in-feed roller 41. The printing pitch of the web W is adjusted according to the magnitude of the tension applied to the web W. At this time, the magnitude of the tension applied to the web W is determined by the rotational speed of the in-feed roller 41 or the position of the dancer roller 42.

  As shown in FIG. 1, the web W sent from the infeed unit 40 is first sent to the first printing unit 10a. The web W sent to the first printing unit 10a is sandwiched between the plate cylinder 11a and the impression cylinder 12a to be printed in the first color. At this time, a first registration mark is attached to the web W by the plate cylinder 11a.

  The web W on which the first color has been printed by the first printing unit 10a is then sent to the second printing unit 10b. The tension of the web W sent to the second printing unit 10b is adjusted by the compensator roller 14b. At this time, as will be described later, the control device 30 controls the driving of the compensator 16b, and the driving of the compensator 16b changes the position of the compensator roller 14b in the direction of the arrow in FIG. It is adjusting.

  The web W is further fed to the plate cylinder 11b of the second printing unit 10b, and is sandwiched between the plate cylinder 11b and the impression cylinder 12b to perform the second color printing. At this time, a second registration mark is attached to the web W by the plate cylinder 11b.

  Next, the first registration mark and the second registration mark on the web W sent from the plate cylinder 11b are respectively detected by the registration mark detection sensor 15b, and the signals of these registration marks are detected by the registration controller of the control device 30. 30a.

  The web W on which the second color printing has been performed in the second printing unit 10b is then sent to the third printing unit 10c for printing. The action of the third printing unit 10c on the web W is substantially the same as the action of the second printing unit 10b described above. That is, the register mark detection sensor 15c detects the second register mark and the third register mark on the web W sent from the plate cylinder 11c, and signals of these register marks are registered controller 30a of the control device 30. Sent to.

Next, the control method by the control device 30 will be described in further detail with reference to FIG.
First, as shown in STEP-1 of FIG. 2, the registration controller 30a of the control device 30 includes the registration marks attached by the plate cylinders 11b and 11c of the printing units 10b and 10c, the printing units 10b, The size of the registration deviation between the registration marks attached by the plate cylinders 11a and 11b of the printing units 10a and 10b immediately upstream of 10c is calculated for each printing unit 10b and 10c. Specifically, for example, the first registration mark and the second registration mark regarding the information of the first registration mark and the second registration mark sent from the registration mark detection sensor 15b of the second printing unit 10b. from the size of the interval, by subtracting the set value of the preset interval, the magnitude e ₁ of misregistration is intermittently detected at predetermined time intervals. This time interval is, for example, the time for which the plate cylinder 11b rotates once.
Similarly, the third printing unit 10c register mark detection information register mark sent from the sensor 15c of the magnitude of misregistration according to the same process been conducted printing unit 10c e ₂ is intermittently detected Is done.

Next, as shown in STEP-2 in FIG. 2, each printing unit 10b, which is calculated by STEP-1, using the size _e 1, _{e 2} of misregistration according to 10c, each printing unit at time t 10b The control amounts V ₁ (t) and V ₂ (t) of the 10c compensator rollers 14b and 14c are calculated over time. Hereinafter, calculation formulas for the control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c will be described in detail individually.

The control amount V ₁ (t) of the compensator roller 14b of the second printing unit 10b is calculated over time based on the magnitude of registration e ₁ related to the second printing unit 10b.
Specifically, the control amount V ₁ (t) of the compensator roller 14b is calculated by the following equation.

V ₁ (t) = k _p e ₁
(K _p : preset control gain)

The control amount V ₂ (t) of the compensator roller 14c of the third printing unit 10c is the amount of misregistration e ₂ related to the third printing unit 10c and the size of the misregistration related to the second printing unit 10b. It is over time calculated on the basis of the e _1.
Specifically, the control amount V ₂ (t) of the compensator roller 14c is calculated by the following equation.
_{V 2 (t) = k p} e 2 + k d (e 2 -e 1)
(K _p , k _d : preset control gain)

If there is another printing unit on the downstream side of the third printing unit 10c, the control amount V _n−1 (t) of the compensator roller of the _nth printing unit (n is an integer of 4 or more) is , The size of the misregistration e _{n−1 related} to the nth printing unit, and the size of the misregistration e _n− related to the (n−1) th printing unit immediately upstream of the nth printing unit. ₂ over time.
_{V n-1 (t) =} k p e n-1 + k d (e n-1 -e n-2)
(K _p , k _d : preset control gain)

As described above, the control gains k _p and k _d used in the above calculation formula can be manually input by the operator by the control gain setting means 30b, all or part of which is a touch panel. Yes.

Thereafter, the register controller 30a uses the control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c thus calculated over time to control the compensator rollers 14b and 14c. Do each.

That is, the control device 30 controls the driving of the compensator motors 16b and 16c of the printing units 10b and 10c based on the calculated control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c. Thus, the positions of the compensator rollers 14b and 14c are adjusted.

  Next, the case where the rotational speeds of the plate cylinders 11a, 11b, 11c of the printing units 10a, 10b, 10c are increased / decreased will be described with reference to the graph shown in FIG. More specifically, the case where the plate cylinder drive controller 30c controls the drive motor 22 to increase the rotation speed of the plate cylinders 11a, 11b, and 11c from 50 m / min to 150 m / min will be described. Here, FIG. 4 shows the time when the rotational speed of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c is increased from 50 m / min to 150 m / min in the gravure printing machine of FIG. It is a graph which shows the relationship between the horizontal axis) and the rotational speed (vertical axis) of the plate cylinders 11a, 11b and 11c, and the graph which shows the relationship between time (horizontal axis) and the magnitude of registration (vertical axis).

First, the correction amount setting unit 30d in the control device 30 will be described. The correction amount setting unit 30d increases or decreases the rotational speed of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c, and when the rotational speed is within a predetermined range. Specifically, when the rotational speed is in the range of 50 m / min to 100 m / min (see “correction control area” in FIG. 4), as shown in FIG. 3, each of the compensator rollers 14b and 14c A correction amount A having a predetermined size is added to the control amounts V ₁ (t) and V ₂ (t), and the compensator motors 16b and 16c are controlled based on the added value of the correction amount A. . That is, the control amounts X ₁ and X ₂ of the compensator rollers 14b and 14c actually transmitted to the compensator motors 16b and 16c are respectively V ₁ (t) + A and V ₂ (t) + A.

More specifically, the correction amount setting unit 30d is within a predetermined range (for example, 50 m / min to 100 m / min) in which the rotation speeds of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c are set in advance. When a predetermined set speed, for example, 70 m / min, is reached, the control amount V ₁ (t), V ₂ (t) of the compensator rollers 14b, 14c is set with a correction amount A having a predetermined size. In addition, the value to which the correction amount A is added is defined as control amounts X ₁ and X ₂ for the compensator rollers 14b and 14c that are actually transmitted to the compensator motors 16b and 16c. That is, when the rotational speed of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c starts to increase from 50 m / min, the correction amount A is added until the rotational speed reaches 70 m / min. However, when the rotational speed of the plate cylinders 11a, 11b, and 11c reaches 70 m / min, the correction amount A is added to the control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c. The value to which the correction amount A is added becomes the control amounts X ₁ and X _{2 of the} compensator rollers 14b and 14c that are actually transmitted to the compensator motors 16b and 16c.

On the other hand, the correction amount setting unit 30d increases or decreases the rotational speed of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c when the rotational speed is out of a predetermined range (see FIG. 4), the correction amount A is not added to the control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c. In this case, the plate cylinder drive controller 30c does not add the correction amount A to the calculated control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c, and the plates of the printing units 10a, 10b, and 10c. The rotational speeds of the cylinders 11a, 11b, and 11c are adjusted, and at this time, the sizes e ₁ and e _{2 of the} misregistration are in a predetermined range (for example, −0.2 mm to 0.2 mm). Switch to the printing speed condition. That is, the plate cylinder drive controller 30c controls the drive motor 22 so as to maintain the sizes of the register deviations e ₁ and e ₂ within a predetermined range set in advance. , 11c is adjusted.

In this way, the control device 30 controls the compensator motors 16b and 16c based on the control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c calculated by the register controller 30a. The positions of the compensator rollers 14b and 14c are adjusted. When the rotational speeds of the plate cylinders 11a, 11b and 11c of the printing units 10a, 10b and 10c are increased or decreased, this rotational speed is set to a predetermined value. When the size is within the range (see “correction control area” in FIG. 4), the compensation motors 16b and 16c are actually added to the compensation motors 16b and 16c by adding the correction amount A to the control amounts V ₁ (t) and V ₂ (t). Control amounts X ₁ and X ₂ of the compensator rollers 14b and 14c to be transmitted are calculated.

As described above, according to the gravure printing machine and the control method thereof according to the present embodiment, when the rotational speeds of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c are increased, the rotational speed is set in advance. When the size is within a predetermined range (for example, 50 m / min to 100 m / min), the compensator rollers 14b and 14c are adjusted by controlling the compensator motors 16b and 16c of the printing units 10b and 10c. In this case, a predetermined correction amount A is added to the calculated control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c. Further, when the rotational speeds of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c are increased, when the rotational speeds of the plate cylinders 11a, 11b, and 11c are out of a predetermined range, The rotational speeds of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c are added without adding the correction amount A to the calculated control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c. In this case, the registration deviation magnitudes e ₁ and e ₂ are switched to a printing speed condition in which the magnitude is within a predetermined range (for example, −0.2 mm to 0.2 mm). ing. As described above, when the printing speed is increased from the steady state, in addition to the control in the steady state, when the rotational speeds of the plate cylinders 11b and 11c are within a predetermined range, the compensator rollers 14b and 14c By adding the correction amount A to the control amounts V ₁ (t) and V ₂ (t) in a feed-forward manner, the printing speed can be reduced in a short period while suppressing the magnitudes e ₁ and e ₂ of the misregistration within the allowable range. Can be increased. In addition, desired registration control can be performed only by setting a predetermined amount of correction amount A and a predetermined range for a gravure printing machine having a different target production speed for each item.

In the graph shown in FIG. 4, the mode when the rotational speeds of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c are increased has been described. However, the gravure printing machine of the present embodiment and its The control method is not limited to such an example. Instead, when the rotational speeds of the printing cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c are decreased and the rotational speed is within a predetermined range, When the compensator rollers 14b and 14c are adjusted by controlling the compensator motors 16b and 16c of the printing units 10b and 10c, the calculated control amounts V ₁ (t) and V ₂ (t ) May be added with a correction amount A having a predetermined size. Further, when the rotational speeds of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c are decreased, when the rotational speeds of the plate cylinders 11a, 11b, and 11c are out of a predetermined range, The rotational speeds of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c are added without adding the correction amount A to the calculated control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c. In this case, the registration deviation magnitudes e ₁ and e ₂ are switched to a printing speed condition in which the magnitude is within a predetermined range (for example, −0.2 mm to 0.2 mm). It may be.

[Comparative Example]
Hereinafter, when the rotational speed of the plate cylinders 11a, 11b, and 11c of the printing units 10a, 10b, and 10c is increased, the rotational speed is within a predetermined range (for example, 50 m / min to 100 m / min). A case where the correction amount A is not added to the control amounts V ₁ (t) and V ₂ (t) of the compensator rollers 14b and 14c calculated by the register controller 30a will be described as a comparative example. . FIG. 5 shows the relationship between the time (horizontal axis) and the rotational speed (vertical axis) of the plate cylinder when the rotational speed of the printing cylinder of the printing unit is increased from 50 m / min to 150 m / min in the comparative example. It is a graph which shows the relationship between a graph and time (horizontal axis) and the magnitude | size of a misregistration (vertical axis).

In the comparative example, the control amounts X ₁ and X ₂ of the compensator rollers 14b and 14c that are actually transmitted to the compensator motors 16b and 16c are the control amounts of the compensator rollers 14b and 14c that are always calculated by the register controller 30a. It is the same size as V ₁ (t) and V ₂ (t).

As shown in FIG. 5, according to the comparative example, when the rotational speed of the plate cylinders 11 b and 11 c of the printing units 10 b and 10 c is increased from 50 m / min to 150 m / min, the size of the registration error e ₁ , e ₂ is hunting large, and may be exhausted to ± 0.6 mm. Here, when the range of the size of misregistration allowable as a non-defective product is −0.2 mm to 0.2 mm, the sizes of misregistration e ₁ and e ₂ exceed the allowable range in the comparative example. Can not get good performance results. On the other hand, according to the gravure printing machine of the present invention, as shown in FIG. 4, the size of misregistration e ₁ , e ₂ is a range of the size of misregistration that is acceptable as a non-defective product. By being within 0.2 mm, good performance results can be obtained.

10a, 10b, 10c Printing units 11a, 11b, 11c Plate cylinders 12a, 12b, 12c Impression cylinders 14b, 14c Compensator rollers 15b, 15c Registration mark detection sensors 16b, 16c Compensation motor 20 Drive unit 21 Line shaft 22 Drive motor 30 Controller 30a Registration controller 30b Control gain setting means 30c Plate cylinder drive controller 30d Correction amount setting device 40 Infeed unit 41 Infeed roller 42 Dancer roller 43 Nip roller 45 Motor W Web

Claims (4)

A pre-stage printing unit having a plate cylinder for printing on a continuously conveyed web and attaching a register mark to the web;
A plurality of succeeding-stage printing units provided in series downstream of the preceding-stage printing unit, each succeeding-stage printing unit printing on a web and attaching a register mark to the web; downstream of the plate cylinder A post-printing unit having a registration mark detection sensor provided on the side for detecting a registration mark on the web, and a compensator roller provided on the upstream side of the plate cylinder for registering the web sent to the plate cylinder;
A registration mark on the web detected by a registration mark detection sensor of one post-printing unit and attached to the plate cylinder of one post-printing unit on the web; Calculate the amount of misregistration between the register marks attached by the plate cylinders of the other subsequent printing units, and calculate the control amount of the compensator roller of one succeeding printing unit based on this misregistration size. A control device that controls the compensator roller of one post-stage printing unit based on the calculated control amount of the compensator roller and adjusts its position;
With
The control device
(A) When increasing or decreasing the rotational speed of the plate cylinder of each printing unit, if this rotational speed is a size within a predetermined range set in advance, the compensator roller of the subsequent printing unit is controlled to change its position. When adjusting, add a correction amount of a predetermined size to the calculated control amount of the compensator roller,
(B) When increasing or decreasing the rotational speed of the plate cylinder of each printing unit, if the rotational speed of the plate cylinder deviates from a predetermined range set in advance, a predetermined preset value set to the calculated control amount of the compensator roller The rotational speed of the plate cylinder of each printing unit is adjusted without adding a correction amount of the size of the printing unit, and at this time, the size of the registration deviation is switched to a printing speed condition that is within a predetermined range.
A gravure printing machine.   When the control device increases or decreases the rotational speed of the plate cylinder of each printing unit, the calculated control amount of the compensator roller when the rotational speed reaches a predetermined set speed within a predetermined range set in advance. 2. The gravure printing machine according to claim 1, wherein a correction amount having a predetermined size set in advance is added to the gravure printing machine. A pre-stage printing unit having a plate cylinder for printing on a continuously conveyed web and attaching a register mark to the web;
A plurality of succeeding-stage printing units provided in series downstream of the preceding-stage printing unit, each succeeding-stage printing unit printing on a web and attaching a register mark to the web; downstream of the plate cylinder A post-printing unit having a registration mark detection sensor provided on the side for detecting a registration mark on the web, and a compensator roller provided on the upstream side of the plate cylinder for registering the web sent to the plate cylinder;
In a control method of a gravure printing machine equipped with
A registration mark on the web detected by a registration mark detection sensor of one post-printing unit and attached to the plate cylinder of one post-printing unit on the web; Calculating the amount of misregistration between the register marks attached by the plate cylinders of other subsequent printing units;
A step of calculating a control amount of a compensator roller of one post-stage printing unit based on the calculated size of misregistration;
A step of controlling the compensator roller of one post-stage printing unit based on the calculated control amount of the compensator roller and adjusting its position;
With
When the rotational speed of the plate cylinder of each printing unit is increased or decreased and the rotational speed is within a predetermined range, the position of the compensator roller of the subsequent printing unit is controlled and adjusted. To the calculated control amount of the compensator roller, a correction amount of a predetermined size set in advance is added,
When the rotation speed of the plate cylinder of each printing unit is increased or decreased, if the rotation speed of the plate cylinder deviates from a predetermined range, a predetermined magnitude set in advance to the calculated control amount of the compensator roller The rotational speed of the plate cylinder of each printing unit is adjusted without adding the correction amount, and at this time, the printing is switched to a printing speed condition in which the size of the registration deviation is within a predetermined range set in advance.
A control method for a gravure printing machine.   When the rotational speed of the plate cylinder of each printing unit is increased or decreased, the calculated control amount of the compensator roller is preset when the rotational speed reaches a predetermined set speed within a predetermined range. 4. The method of controlling a gravure printing machine according to claim 3, wherein a correction amount having a predetermined size is added.

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