JP2006187909A - Gravure printing machine and gravure printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gravure printing machine and a gravure printing method, in which, at the application of the printing to a web by an additional printing, the printing pitch given by the previous printing can be coincided with the printing pitch given by the additional printing by automatically adjusting the printing pitch of the web, on which the previous printing has been applied. <P>SOLUTION: This gravure printing machine comprises an in-feed unit 20 giving a tension to the web W, printing units 10 and a controller 30. Each printing unit 10 has a plate cylinder 11 for applying the printing to the web W by the additional printing, a register mark detecting sensor 15 for detecting the register mark given on the web W and a compensator roller 14. The controller 30 controls the compensator roller 14 and, at the same time, adjusts the magnitude of the tension to give to the web W through the controlling of the in-feed unit 20 based upon the magnitude of the positional shear between that of the register mark given by the previous printing and that of the register mark given by the additional printing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gravure printing machine and a gravure printing method for performing further overprinting on a web that has been preprinted in advance, and in particular, registration between preprinted printing and overprinting printing on the web. The present invention relates to a gravure printing machine and a gravure printing method capable of accurately performing the above.

  As a gravure printing machine, there is an infeed unit that initially applies tension to a web such as film or paper, and a plurality of printing units that perform multicolor printing on a web sent from the infeed unit. Known (see, for example, Patent Documents 1 and 2). Such a conventional gravure printing machine will be described with reference to FIG.

  As shown in FIG. 3, a plurality of printing units 40a, 40b, 40c in a conventional gravure printing machine have substantially the same configuration, and each printing unit 40a, 40b, 40c has a printing cylinder 41a, 41b. , 41c and plate cylinders 41a, 41b, 41c, the web W is sandwiched between the impression cylinders 42a, 42b, 42c for printing each color on the web W. In addition, when printing is performed on the web W, the plate cylinders 41a, 41b, and 41c are each provided with a register mark on the web W. Also, compensator rollers 44b and 44c that move in the direction of the arrow in FIG. 3 to register the web W are arranged upstream of the plate cylinders 41b and 41c, respectively, and further downstream of the plate cylinders 41b and 41c. Are provided with registration mark detection sensors 45b and 45c for detecting a registration mark attached to the web W, respectively.

  As shown in FIG. 3, the infeed unit 50 includes an infeed roller 51 that is rotationally driven, a pressure drum 53 that sandwiches the web W between the infeed roller 51, and a downstream side of the infeed roller 51. The dancer roller 52 is provided and is movable in the direction of the arrow in FIG. The web W sent to the infeed unit 50 is nipped between the infeed roller 51 and the impression cylinder 53, detects the position of the dancer roller 52, and changes the speed of the infeed roller 51. The tension is adjusted.

  The conventional gravure printing machine further includes a control device 60 including a register controller 61. The register controller 61 controls the compensator rollers 44b and 44c of the printing units 40b and 40c to adjust their positions. The positions of the compensator rollers 44b and 44c by the registration controller 61 are adjusted based on the positions of the registration marks on the web W detected by the registration mark detection sensors 45b and 45c, respectively.

The operation of the conventional gravure printing machine having such a configuration will be described with reference to FIG.
First, the plain web W is sent to the infeed unit 50, and the web W is tensioned in the infeed unit 50. Thereby, the printing pitch of the web W is adjusted according to the magnitude of the tension applied to the web W. Next, the web W is sent from the infeed unit 50 to a plurality of printing units 40a, 40b, and 40c, and printing of each color is performed on the web W by the plate cylinders 41a, 41b, and 41c in the printing units 40a, 40b, and 40c, respectively. Is given. At this time, register marks are respectively attached to the web W by the plate cylinders 41a, 41b, and 41c.

  In the printing units 40 b and 40 c, the registration mark attached on the web W is detected by the registration mark detection sensors 45 b and 45 c, and a signal of the position of the registration mark on the web W is sent to the registration controller 61 of the control device 60. . The compensator rollers 44b and 44c change their positions according to the operation amount calculated based on the information of the position of the register mark on the web W sent from the register controller 61, thereby the plate cylinder 41b, Registration of the web W sent to 41c is performed.

  According to the gravure printing machine shown in FIG. 3 described above, the compensator rollers 44b and 44c of the printing units 40b and 40c for the respective colors perform registration of the web W based on the information on the position of the registration mark on the web W. The web W can be registered with high accuracy between the printing units 40a, 40b, and 40c.

JP 2004-66577 A Japanese Patent Laid-Open No. 11-28804

  Using the gravure printing machine shown in FIG. 3, there may be a case where additional printing is further performed on the web W that has been preprinted in advance. The reprint printing is to perform additional printing on a web W such as a film or paper on which a pattern or the like has already been printed. Specifically, for example, a surface coat or The back side is printed.

However, when performing reprint printing on the web W, the print pitch by the preprint of the web W does not match the print pitch by the reprint, and the gravure printing machine shown in FIG. It is difficult to automatically match the registration with the reprint printing. In such a case, in order to match the registration of the pre-printing printing and the follow-up printing with respect to the web W, the operator reduces the printing speed (conveying speed of the web W) of the gravure printing machine, and the web W is out of registration. And the operator manually adjusts the amount of tension that the infeed unit 50 applies to the web W in accordance with the misregistration state, and the printing pitch of the web W that has been preprinted in advance is not corrected. Don't be.
In particular, when a web that is easy to stretch, such as a biaxially stretched polypropylene film (OPP) or an unstretched polypropylene film (CPP), is used as the web W, the web W is wound once after pre-printing is finished (not shown). The printing pitch changes greatly when winding the sheet. For this reason, when performing reprint printing on such a web W, the operator must manually adjust the magnitude of the tension applied to the web W by the infeed unit 50 at all times.

Further, in the case of performing additional printing on the web W, as shown in FIG. 3, the plate cylinder 41a of the first printing unit 40a is isolated from the web W, and the first printing unit 40b performs the first color printing. May be printed on the web W. This is because the first printing unit 40a does not have a compensator roller, and the second printing unit 40b has a compensator roller 44b and a registration mark detection sensor 45b. This is because registration can be performed.
However, when such additional printing is performed, the control of the tension of the web W by the infeed unit 50 and the control of the compensator roller 44b of the printing unit 40b interfere with each other, and each control is stably performed. There are times when you can't.

  The present invention has been made in consideration of the above points, and automatically adjusts the print pitch of a web that has been pre-printed in advance when performing reprint printing on the web. An object of the present invention is to provide a gravure printing machine and a gravure printing method capable of matching the printing pitch by web pre-printing with the printing pitch by follow-up printing.

The present invention provides an infeed unit that applies tension to a web that has been preprinted and has a preprinted registration mark, and performs reprint printing on a web that is conveyed from the infeed unit. A plate cylinder for attaching a reprint register mark to the web, a register mark detection sensor provided on the downstream side of the plate cylinder for detecting a preprint register mark and a reprint register mark on the web, and an upstream side of the plate cylinder A printing unit provided with a compensator roller for registering the web sent to the plate cylinder, and adjusting the position of the printing unit by controlling the compensator roller of the printing unit, and on the web detected by the registration mark detection sensor Based on the amount of deviation between the position of the preprinted register mark and the position of the overprinted register mark. A controller for adjusting the magnitude of tension to be applied to the web by controlling the Idoyunitto a gravure printing machine, characterized in that it comprises a.
According to such a gravure printing machine, in the case of performing overprint printing on the web, the control device determines the amount of deviation between the position of the preprinted registration mark and the position of the overprinting registration mark on the web. Based on this, the infeed unit is controlled to automatically adjust the amount of tension applied to the web. For this reason, it is possible to automatically adjust the print pitch of the web that has been pre-printed in advance so that the print pitch by the web pre-print and the print pitch by the follow-up printing are matched.

The gravure printing machine of the present invention preferably further includes a tension cut unit that is provided between the infeed unit and the printing unit and includes a pair of rollers that sandwich the web conveyed from the infeed unit.
According to such a gravure printing machine, the tension cut unit is provided between the infeed unit and the printing unit that actually performs printing on the web, and the tension cut unit removes the web conveyed from the infeed unit. Since the pair of rollers is sandwiched, the control of the tension applied to the web by the infeed unit and the control by the compensator roller for the web described later are separated. Thus, interference between the tension control by the infeed unit and the control by the compensator roller can be suppressed, and each control can be stably performed.

In the gravure printing machine of the present invention, the control device calculates the magnitude of the deviation between the position of the pre-printed registration mark and the position of the additional printing registration mark on the web a plurality of times, and averages the magnitudes of the plurality of deviations. When the value is larger than a preset deviation amount, the infeed unit is controlled. At this time, the magnitude of the tension that the infeed unit gives to the web is determined based on the average value of the plural deviation amounts. It is preferable to adjust.
Usually, the size of the registration mark position deviation in the steady state of the gravure printing machine fluctuates at a certain period. This periodicity and amplitude vary depending on the configuration and printing state of the gravure printing machine. In this state, when the infeed tension correction amount is calculated each time based on the size of the registration mark position deviation for each rotation of the plate cylinder, the periodic fluctuation of the registration mark position deviation is directly applied to the infeed. There is a possibility that the tension correction amount will periodically fluctuate and the deviation between the position of the pre-printed registration mark and the position of the follow-up registration mark may increase.
Here, according to the gravure printing machine of the present invention, the infeed tension correction amount is calculated using the average value of the registration mark position deviations calculated a plurality of times. Even when the magnitude of the deviation fluctuates at a constant period, the magnitude of the tension applied to the web by the infeed unit can be adjusted stably.

The present invention includes a step of performing pre-printing on a web and attaching a pre-printed registration mark to the web, a step of applying tension to the web on which pre-printing printing has been performed by an infeed unit, The process of registering the web sent from the unit with the compensator roller of the printing unit, and printing the reprint mark on the web sent from the compensator roller with the plate cylinder of the printing unit and the reprint register mark The process of attaching to the web, the process of detecting the pre-printed register mark and the follow-up register mark on the web sent from the plate cylinder by the register mark detection sensor of the printing unit, respectively, and the controller detects the register mark detection sensor. The position of the preprinted register mark on the printed web and the overprint register mark The amount of deviation from the position is calculated, and the tension applied to the web by controlling the compensator roller of the printing unit and adjusting the position based on the calculated amount of deviation and controlling the infeed unit And a step of adjusting the size of the gravure printing method.
According to such a gravure printing method, in the case of performing reprint printing on the web, the gravure printing method is performed based on the amount of deviation between the position of the preprint registration mark and the position of the reprint registration mark on the web. The feed unit is controlled to automatically adjust the amount of tension applied to the web. For this reason, it is possible to automatically adjust the print pitch of the web that has been pre-printed in advance so that the print pitch by the web pre-print and the print pitch by the follow-up printing are matched.

  According to the gravure printing machine and the gravure printing method of the present invention, in the case of performing overprint printing on the web, the difference between the position of the preprinted registration mark and the position of the overprinting registration mark on the web is increased. Based on this, the infeed unit is controlled to automatically adjust the amount of tension applied to the web. For this reason, it is possible to automatically adjust the print pitch of the web that has been pre-printed in advance so that the print pitch by the web pre-print and the print pitch by the follow-up printing are matched.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 are diagrams 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 method by the control apparatus of the gravure printing machine of FIG.

The gravure printing machine shown in FIG. 1 performs further overprinting on a web W such as a film or paper that has been pre-printed and pre-printed with registration marks. An infeed unit 20 that applies tension to the web W fed in the direction of the arrow, a tension cut unit 10a that sandwiches the web W conveyed from the infeed unit 20, and a downstream side of the tension cut unit 10a, Are provided with a plurality of, for example, two printing units 10b and 10c for printing different colors on the web W.
Of the printing units 10b and 10c, the printing unit 10b is a first color printing unit, and the printing unit 10c is a second color printing unit. The gravure printing machine also includes a control device 30 that controls the infeed unit 20, the tension cut unit 10a, and the printing units 10b and 10c.

The printing units 10b and 10c have substantially the same configuration, and are impression cylinders for printing each color by sandwiching the web W between the printing cylinders 11b and 11c and the printing cylinders 11b and 11c. 12b, 12c. When printing is performed on the web W, each of the plate cylinders 11b and 11c is provided with an additional registration mark on the web W.
As shown in FIG. 1, the tension cut unit 10a includes a plate cylinder 11a and an impression cylinder 12a. The plate cylinder 11a is an empty plate, and the plate cylinder 11a and the pressure cylinder constituting a pair of rollers. The web W is sandwiched between the cylinder 12a, but no printing is performed on the web W.

  The plate cylinders 11a, 11b, and 11c are driven to rotate synchronously by a line shaft (not shown) connected to the drive motor 18. The drive of the drive motor 18 is controlled based on a signal sent from a line controller 33 of the control device 30 described later.

  The printing units 10b and 10c further have compensator rollers 14b and 14c which are provided on the upstream side of the plate cylinders 11b and 11c and are movable in the direction of the arrows in FIG. The compensator rollers 14b and 14c are configured to register the web W sent to the plate cylinders 11b and 11c by changing their positions. Further, the printing units 10b and 10c are further provided on the downstream side of the plate cylinders 11b and 11c, and detect pre-print registration marks previously attached to the web W and reprint registration marks respectively attached by the plate cylinders 11b and 11c. Register mark detection sensors 15b and 15c.

  The compensator rollers 14b and 14c are driven by the compensator motors 16b and 16c, respectively, so that the positions thereof change. The operation amount signal is sent to control the drive.

The infeed unit 20 is provided on the downstream side of the infeed roller 21 provided on the downstream side of the infeed roller 21, the infeed roller 21 that rotates and the pressure drum 23 that sandwiches the web W between the infeed roller 21. And a dancer roller 22 which is free. A drive motor 28 for rotating the infeed roller 21 is connected to the infeed roller 21. The dancer roller 22 is connected to an air cylinder (not shown) that moves the dancer roller 22 in the direction of the arrow in FIG.
The web W sent to the infeed unit 20 is sandwiched between the infeed roller 21 and the impression cylinder 23, detects the position of the dancer roller 22, and changes the speed of the infeed roller 21. A speed difference is generated between the in-feed roller 21 and the plate cylinder 11a, so that the tension is changed.

  The control device 30 is connected to the drive motor 28 of the infeed unit 20, the compensator motors 16b and 16c of the printing units 10b and 10c, and the registration mark detection sensors 15b and 15c, and is detected by the registration mark detection sensors 15b and 15c. The drive motor 28 and the compensator motors 16b and 16c are controlled based on the signals of the positions of the pre-printed register mark and the post-printed register mark on the web W. The control method by the control device 30 will be described in detail later.

Next, the operation of the present embodiment having such a configuration will be described.
First, before sending the web W to the gravure printing machine shown in FIG. At this time, a preprinted register mark is attached to the web W. The pre-printing on the web W may be performed using the gravure printing machine shown in FIG. 1 or may be performed by another type of gravure printing machine.

  Next, when the web W on which preprint printing has been performed is conveyed to the gravure printing machine shown in FIG. 1, the web W is first sent to the infeed unit 20. In the infeed unit 20, the web W is sandwiched between the infeed roller 21 and the impression cylinder 23 of the infeed unit 20, and the position of the dancer roller 22 is detected to change the speed of the infeed roller 21. Will change the tension. Then, the printing pitch of the web W on which the preprint printing has been performed 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 infeed roller 21 or the position of the dancer roller 22. The rotational speed of the infeed roller 21 or the position of the dancer roller 22 is described later. Thus, the control device 30 adjusts.

  As shown in FIG. 1, the web W fed from the infeed unit 20 is then sandwiched between the plate cylinder 11a and the impression cylinder 12a of the tension cut unit 10a. Thereby, the control of the tension applied to the web W by the infeed unit 20 and the control by the compensator rollers 14b and 14c for the web W described later are separated, and the tension control by the infeed unit 20 and the compensator roller 14b, The control by 14c does not interfere.

  Next, the web W is sent from the tension cut unit 10a to the first color printing unit 10b. The web W sent to the printing unit 10b is registered by the compensator roller 14b. This registration is performed by the control device 30 controlling the driving of the compensator motor 16b as described later. The driving is performed by changing the position of the compensator roller 14b in the direction of the arrow in FIG.

  Next, the web W is sent to the plate cylinder 11b of the printing unit 10b, and the web W is sandwiched between the plate cylinder 11b and the impression cylinder 12b, and thus the web W is subjected to reprint printing. The At this time, a reprint registration mark is attached to the web W by the plate cylinder 11b. Next, the preprint registration mark and the overprint registration mark on the web W sent from the plate cylinder 11 b are respectively detected by the registration mark detection sensor 15 b, and a signal of the position of each registration mark is sent to the control device 30.

  The web W discharged from the first color printing unit 10b is then sent to the second color printing unit 10c, and the second color printing unit 10c uses a different color different from the first color printing unit 10b, for example. Printing is performed. The operation of the printing unit 10c for the second color on the web W is substantially the same as the operation of the printing unit 10b for the first color described above.

Next, the control method by the control device 30 will be described in further detail with reference to FIG. 1 and FIG.
As shown in FIGS. 1 and 2, the control device 30 includes a register controller 31, a pitch controller 32 connected to the register controller 31, and a line controller 33 connected to the pitch controller 32.
As shown in FIG. 1, the registration controller 31 is connected to the registration mark detection sensors 15b and 15c and the compensation motors 16b and 16c, and the preprinted registration mark on the web W detected by the registration mark detection sensors 15b and 15c. And a signal of the position of the reprint register mark are sent to the register controller 31.

In the register controller 31, for each of the printing units 10b and 10c for the first color and the second color that actually print on the web W, the position of the preprinted registration mark on the web W and the web cylinder W by the plate cylinders 11b and 11c, respectively. The magnitudes Ab and Ac of the deviation from the position of the additional printing registration mark attached above are calculated. Next, the register controller 31 of the control device 30 controls the driving of the compensator motors 16b and 16c of the printing units 10b and 10c so as to reduce the magnitudes Ab and Ac of the deviation, respectively, and the compensator rollers 14b and 14c. Adjust the position.
When the driving control of the compensator motor 16c is performed in the printing unit 10c, instead of using the magnitude Ac of the deviation between the position of the preprinted registration mark and the position of the additional printing registration mark attached by the plate cylinder 11c, The position of the reprint registration mark attached by the plate cylinder 11b and the position of the reprint registration mark attached by the plate cylinder 11c on the web W are detected by the registration mark detection sensor 15c, respectively, and the magnitude of the misalignment between the two positions is detected. The operation amount of the compensator roller 14c may be calculated based on the length.

  During this time, in the registration controller 31, the magnitude of the deviation between the position of the preprinted registration mark and the position of the overprinting registration mark on the web W detected by the registration mark detection sensor 15b of the printing unit 10b that performs printing of the first color. Ab is calculated at a preset time interval, specifically, for example, a plurality of times for each rotation of the plate cylinder 11b. The plurality of deviation Ab signals are sent to the pitch controller 32.

  When the average value (offset amount) of the plurality of deviation magnitudes Ab sent from the register controller 31 is larger than the preset deviation amount preset in the pitch controller 32, the pitch controller 32 determines the plurality of deviations. The infeed tension correction value is calculated based on the average value (offset amount) of the magnitude Ab. Specifically, the infeed tension correction value is calculated so that the magnitude Ab of the deviation between the position of the pre-printed registration mark and the position of the additional printing registration mark on the web W is reduced. Then, an infeed tension correction value signal calculated by the pitch controller 32 is sent to the line controller 33.

The line controller 33 changes the infeed tension setting value preset in the line controller 33 based on the infeed tension correction value sent from the pitch controller 32. Then, the line controller 33 changes the air cylinder pressure of the air cylinder connected to the dancer roller 22 via the electropneumatic converter based on the changed infeed tension setting value. The infeed tension is controlled by the line controller 33 by utilizing the movement of the dancer roller 22 by the balance between the pressure of the air cylinder connected to the dancer roller 22 and the tension applied to the roller by the web W.
That is, using a known relationship between tension and air cylinder pressure, air is supplied to the air cylinder connected to the dancer roller 22 so that the air cylinder pressure corresponds to the desired tension. When the pressure of the air cylinder and the tension applied to the roller by the web W are the same, the dancer roller 22 does not move. On the other hand, if there is an imbalance of these forces, the position of the dancer roller 22 will change. Tension control is performed by changing the speed of the in-feed roller 21 so that the position of the dancer roller 22 becomes a desired position (usually an intermediate position).
In this way, the magnitude of the tension applied to the web W by the infeed unit 20 is adjusted by the line controller 33 of the control device 30.

  During this time, the drive motor 18 is controlled by the line controller 33 of the control device 30, and the plate cylinders 11a, 11b, 11c of the tension cut unit 10a and the printing units 10b, 10c are rotated in synchronization.

  According to the gravure printing machine and the gravure printing method of the present embodiment, as described above, the register controller 31, the pitch controller 32, and the line controller 33 of the control device 30 in the case of performing reprint printing on the web W. Accordingly, the infeed unit 20 is controlled to automatically adjust the magnitude of the tension applied to the web W based on the amount of deviation between the position of the pre-printed registration mark and the position of the additional printing registration mark on the web W. is doing. For this reason, it is possible to automatically adjust the printing pitch of the web W on which the pre-printed printing has been performed in advance, so that the printing pitch by the pre-printing of the web W matches the printing pitch by the additional printing.

  Further, the tension cut unit 10a is provided between the infeed unit 20 and the printing unit 10b that actually performs printing on the web W. The tension cut unit 10a holds the web W conveyed from the infeed unit 20. Since the printing cylinder 11a and the impression cylinder 12a (a pair of rollers) are provided, the tension applied to the web W by the infeed unit 20 and the control by the compensator rollers 14b and 14c for the web W, which will be described later, Is cut off. Thus, interference between the tension control by the infeed unit 20 and the control by the compensator rollers 14b and 14c can be suppressed, and each control can be performed stably.

In addition, the pitch controller 32 of the control device 30 calculates the amount of deviation between the position of the preprinted registration mark and the position of the additional printing registration mark on the web W a plurality of times, and averages the magnitudes of the plurality of deviations. Is greater than a preset set deviation amount, the infeed unit 20 is controlled. At this time, the magnitude of the tension applied to the web W by the infeed unit 20 is adjusted based on the average value of the magnitudes of the plurality of deviations.
Usually, the size of the registration mark position deviation in the steady state of the gravure printing machine fluctuates at a certain period. This periodicity and amplitude vary depending on the configuration and printing state of the gravure printing machine. In this state, when the infeed tension correction amount is calculated each time based on the size of the registration mark position deviation for each rotation of the plate cylinder, the periodic fluctuation of the registration mark position deviation is directly applied to the infeed. There is a possibility that the tension correction amount will periodically fluctuate and the deviation between the position of the pre-printed registration mark and the position of the follow-up registration mark may increase.
Here, according to the gravure printing machine of the present embodiment, the infeed tension correction amount is calculated using the average value of the registration mark position deviation calculated multiple times. Even when the magnitude of the position shift fluctuates at a constant period, the magnitude of the tension applied to the web W by the infeed unit 20 can be stably adjusted.

It is explanatory drawing which shows the structure of the gravure printing machine of this Embodiment. It is a block diagram which shows the control method by the control apparatus of the gravure printing machine of FIG. It is explanatory drawing which shows the structure of the conventional gravure printing machine.

Explanation of symbols

10a Tension cut unit 10b, 10c Printing unit 11a, 11b, 11c Plate cylinder 12a, 12b, 12c Impression cylinder 14b, 14c Compensator roller 15b, 15c Registration mark detection sensor 16b, 16c Compensation motor 18 Drive motor 20 Infeed unit 21 Infeed Roller 22 Dancer roller 23 Impression cylinder 28 Drive motor 30 Controller 31 Register controller 32 Pitch controller 33 Line controllers 40a, 40b, 40c Printing units 41a, 41b, 41c Plate cylinders 42a, 42b, 42c Impression cylinders 44b, 44c Compensator roller 45b, 45c Registration mark detection sensor 50 Infeed unit 51 Infeed roller 52 Dancer roller 53 Impression cylinder 60 Controller 61 Registration controller W Web

Claims (4)

An in-feed unit that applies tension to a web that has been pre-printed and pre-printed with registration marks;
A plate cylinder on which a reprint is printed on the web conveyed from the infeed unit and a reprint register mark is attached to the web, and a preprint register mark and a reprint on the web are provided on the downstream side of the plate cylinder. A printing unit having a registration mark detection sensor for detecting each of the registration marks, and a compensator roller provided on the upstream side of the plate cylinder and configured to register the web sent to the plate cylinder;
The compensator roller of the printing unit is controlled to adjust its position, and is adjusted based on the amount of deviation between the position of the preprinted register mark on the web and the position of the overprinted register mark detected by the register mark detection sensor. A control device that controls the feed unit to adjust the amount of tension applied to the web;
A gravure printing machine characterized by comprising:   2. The gravure printing machine according to claim 1, further comprising a tension cut unit provided between the infeed unit and the printing unit and having a pair of rollers for sandwiching a web conveyed from the infeed unit.   The control device calculates the amount of deviation between the position of the preprinted registration mark and the position of the overprinting registration mark on the web a plurality of times, and an average value of the plurality of deviations is a preset deviation amount. The infeed unit is controlled when it is larger, and the amount of tension applied to the web by the infeed unit is adjusted based on the average value of the plurality of deviations. The gravure printing machine according to 1 or 2. Pre-printing the web and applying a pre-printed registration mark to the web;
Applying tension to the web on which pre-printed printing has been performed by an infeed unit;
Registering the web sent from the infeed unit with the compensator roller of the printing unit;
Applying a reprint to the web sent from the compensator roller by the plate cylinder of the printing unit and attaching a reprint register mark to the web;
Detecting a pre-printed register mark and a follow-up registered mark on the web sent from the plate cylinder by a register mark detection sensor of the printing unit;
The control device calculates the amount of deviation between the position of the preprinted registration mark and the position of the overprinting registration mark on the web detected by the registration mark detection sensor, and based on the calculated amount of deviation. Controlling the compensator roller of the printing unit to adjust its position and controlling the infeed unit to adjust the amount of tension applied to the web;
A gravure printing method characterized by comprising:

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