KR101283829B1 - Controlling device of gravure printing presses - Google Patents

Abstract

The present invention relates to a technique for effectively preventing, in a simple configuration, the influence of the influence on the printing unit on the rear end side when correcting the printing misalignment performed on the target object. According to the present invention, the detection means 19 for detecting the printing position performed on the printed object by the printing panning of the printing unit and the printing plate phase of the printing unit in which the printing misalignment occurs are adjusted. Correction means 21 for correcting the printing misalignment, and correction means 22 for correcting the phasing phase of the printing unit located at the rear end side of the printing unit in which the printing misalignment is corrected. Accordingly, the present invention corrects the pulsating phase of the rear-side printing unit at the same time in the same direction as the adjustment direction at the time when the pulsating phase is adjusted, and also prints a portion immediately after correction of the printing misalignment. When the light reaches the printing unit on the rear end side, after recalibrating the pulsating phase of the printing unit on the rear end side, the phase correction amount after this recalibration is decreased over time.

Printing press, web press, controller, printed matter, printed matter, phase correction

Description

CONTROLLING DEVICE OF GRAVURE PRINTING PRESSES}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view showing the overall configuration of a gravure rotoprinter with a control device according to the present invention.

2 is an explanatory diagram showing an embodiment of a control apparatus of a gravure rotoprinter according to the present invention.

3 is an explanatory diagram showing a control action of the plate phase.

Fig. 4 is a time chart showing a state of change in substrate length and plate phase in accordance with the first embodiment of the present invention.

Fig. 5 is a time chart showing a state of change of substrate length and plate phase in accordance with the second embodiment of the present invention.

Fig. 6 is a time chart showing a state of change of substrate length and plate phase in accordance with the third embodiment of the present invention.

Fig. 7 is a time chart showing a change state of the plate phase according to the fourth embodiment of the present invention.

Fig. 8 is a time chart showing a change state of the plate motion phase according to the fifth embodiment of the present invention.

Fig. 9 is a time chart showing a change state of print misalignment according to a comparative example of the present invention.

Fig. 10 is a time chart showing a change state of print misalignment according to the comparative example of the present invention.

Fig. 11 is a time chart showing a change state of the print shift according to the fifth embodiment of the present invention.

<Short description of drawing symbols>

1: toner 5 to 8: printing unit

11: printing fan 16: drive motor

19: Mark sensor (detection means) 21: Correction means

22: correction means

Japanese Patent Laid-Open No. 10-86343

Japanese Patent Laid-Open No. 2003-237033

According to the present invention, a plurality of printing units are arranged along the conveying path of the printed matter, and the printing fan drives installed in each printing unit are individually driven by a driving motor to sequentially print the printed objects. To a gravure printing press.

Conventionally, a plurality of printing units are arranged along a conveying path of a printing web (web; rolled paper; to-be-printed object), and the printing pans provided on each print unit are rotated individually by a drive motor, respectively, to sequentially receive the to-be-printed object. In the gravure rotoprinter of the commonly-known section drive system configured to perform printing, for example, as described in Japanese Patent Application Laid-open No. Hei 10-86343, a mark mark printed on a printing web in each printing unit is a mark. Detecting by the detecting means and determining the deviation (printing deviation) on the basis of the detection distance between the mark marks, and when it is determined that there is a deviation, the deviation is determined according to the error amount of the deviation. Driving of each printing unit from the generated printing unit and the printing unit to the printing unit at the far end of the web winding side The speed is corrected by changing the speed to the same operation amount while maintaining the synchronization between these printing units, and after the phase correction is completed, the driving speed of each printing unit is returned to the synchronous driving speed, and all the printing units are synchronized and driven. do.

Further, for example, as shown in Japanese Patent Laid-Open No. 2003-237033, in a sectional gravure printing machine which does not include a compensator roll, it is provided with a printing unit by at least three stages of a driving motor, The speed command value is given to the motor driver of each printing unit, and in the printing units after the second stage, the detection scale of the printing scale given to the printing substrate (printed object) and the origin signal detection system of the printing plate are respectively provided. In a gravure printing machine equipped with a control system for correcting the speed command value based on a scale error and a position detection value respectively obtained from the plate, the plate according to the scale adjustment of the printing unit at the front end between the control systems of the printing units at each stage. Configure and connect the tension variation of the printing substrate by phase manipulation and the corresponding scale error, that is, the plate phase transfer model, and The feed model is subjected to feed forward compensation to the control system of the printing unit of the next stage of its output.

As disclosed in Japanese Patent Laid-Open No. Hei 10-86343, the driving speed of each printing unit from the printing unit in which misalignment has occurred and from the printing unit to the printing unit at the far end of the web winding side is printed. In the case where the phase is corrected by changing the unit with the same operation amount while maintaining the synchronization between the units, if the path length between the printing unit in which the misalignment is corrected and the printing unit positioned before and after the same is constant, Since the apparent base length between the printing unit that has been corrected and the printing unit located on the rear end side is kept constant, it is possible to temporarily determine that the misalignment caused by the correction of the misalignment occurs in the printing unit on the rear end side. It can be suppressed.

However, by correcting the misalignment, it occurs in the printing unit on the rear end with a predetermined time difference, so that the misalignment occurs in the printing unit in which the misalignment occurs as described in Japanese Patent Application Laid-open No. Hei 10-86343 and the rear end thereof. If the displacement is corrected by simultaneously changing the driving speed with the arranged printing unit at the same operation amount, the amount of stretching of the to-be-printed object stretched by the correction of the deviation is gradually increased over time. In addition to this, new displacements cannot be avoided between the printing unit in which the deviation occurs and the printing unit at the rear end thereof, and a long time is required to completely correct these deviations. There was this.

In addition, Japanese Patent Application Laid-Open No. 2003-237033 has a transfer model of the tension variation of the printing substrate and its corresponding scale error (plate phase) by manipulation of the plate phase accompanying the scale adjustment of the preceding printing unit. Computing device, for example the moment of inertia (J) of the free roll disposed between the printing units of each stage, the path length between one end and the next stage printing unit, the path length between the next stage and the next stage printing unit, printing substrate By arranging an arithmetic unit having a transfer model constructed on the basis of the velocity constant, the conversion constant of the tension to displacement, and the like, between the printing units, and setting the moment of inertia (J) and the conversion constant of the tension as appropriate, It is disclosed that when the misalignment is corrected in a specific printing unit, the influence can be effectively prevented from affecting the printing unit on the rear end side.

However, since it is not clear how to set the moment of inertia (J) and the conversion constant of the tension, etc., it is possible to effectively prevent the influence of correction of the misalignment performed on a specific printing unit on the printing unit on the rear end side. The question is whether or not. In addition, since it is necessary to arrange a high performance computing device having a complicated configuration between each printing unit, there is a problem that the cost increases.

 SUMMARY OF THE INVENTION In order to solve the above problem, in the gravure rotoprinter in which a plurality of printing units are arranged along a conveyance path of a printed matter, the influence of the rear end side is corrected when correcting the printing misalignment sequentially performed on the printed matter. An object of the present invention is to provide a gravure rotation printing press control device that can effectively prevent the impact on the printing unit with a simple configuration.

The invention according to claim 1, wherein a plurality of printing units are arranged along the conveyance path of the to-be-printed object, and the printing plate-boards provided in each printing unit are individually driven to rotate by a drive motor so that printing is sequentially performed on the to-be-printed object. A control apparatus of a gravure rotoprinter configured, wherein the printing misalignment is detected by detecting means for detecting a printing position applied to a to-be-printed object by a printing pan of each printing unit, and when the occurrence of printing misalignment is detected by the detecting means. Correction means for correcting the printing misalignment by adjusting the pulsating phase of the generated printing unit, and correction means for correcting the pulsating phase of the printing unit located at the rear end side of the printing unit in which the printing misalignment is corrected. Here, the correction means, at the time when the adjustment of the pulsation phase by the correction means, initially corrects the pulsation phase of the printing unit on the rear end to the same degree in the same direction as the adjustment direction, and then the phase after the initial correction. The correction amount is decreased in response to the passage of time, and at the time when the printed portion reaches the printing unit on the rear end immediately after the correction of the printing misalignment by the correcting means, the pulsating phase set by the correcting means After recalibrating the pulsating phase of the printing unit on the rear end side in the same direction as the adjustment direction, control is performed to reduce the phase correction amount after the recalibration over time.

The invention according to claim 2, wherein, in the control apparatus of the gravure rotoprinter according to claim 1, in the case of recalibrating the pulsation phase of the printing unit on the rear end in correspondence with the adjustment amount of the pulsation phase set by the correction means. The recalibration amount is determined by the path length between the printing unit in which the printing misalignment is corrected and the printing unit located on the front end side thereof, and the printing unit in the rear end side of the printing unit in which the printing misalignment correction is performed. Set to a value corresponding to the ratio of the path length of the printed matter.

The invention according to claim 3, wherein, in the control apparatus of the gravure rotoprinter according to claim 1 or 2, the plate in response to the change in the amount of stretching of the to-be-printed object generated after the correction of the printing misalignment by the correction means is performed. And to reduce the phase correction amount after initial phase correction and recalibration.

The invention according to claim 4, wherein, in the control apparatus for a gravure rotoprinter according to claim 1 or 2, the phase correction amount is gradually increased when the phase correction amount after initial correction and re-calibration of the pulsation phase is reduced by a correction means. It is configured to change.

In the invention according to claim 5, in the control apparatus of the gravure rotoprinter according to claim 3, the phase correction amount is changed in steps when the correction means decreases the phase correction amount after the initial correction and re-calibration of the plate motion phase. It is configured to be.

According to the invention according to claim 6, a plurality of printing units are arranged along the conveyance path of the to-be-printed object, and the printing pans provided in each printing unit are individually driven to rotate by a drive motor, thereby sequentially printing the to-be-printed object. A control apparatus for a special gravure rotoprinter, comprising: detecting means for detecting a printing position performed on a printed object by a printing pan of each printing unit, and a printing unit at the uppermost end detected by the detecting means. If it is detected that a print shift has occurred based on the interval between the applied resist mark and the print mark of the rear end printing unit, the print mark of the print unit of the rear end printing unit is adjusted. Correcting means for correcting the print shift, and correcting the print shift. And correction means for correcting the pulsation phase of the printing unit located at the rear end side of the true printing unit. Here, the correction means corrects the phasing phase of the rear-side printing unit to the same degree in the same direction as the adjustment direction at the time when the throttling phase is adjusted by the correction means, and then corrects the phase correction amount after the initial correction. Control to decrease over time is performed.

1 to 3 are schematic configuration diagrams of a gravure rotoprinter having a control device according to the present invention. The gravure rotoprinter includes a sending part 2 of a to-be-printed object 1 made of a sheet material such as a rolled paper or a resin film wound in a roll shape, and a to-be-printed object 1 sent from the sending part 2. ) A plurality of first to third parts arranged along the conveyance path of the in-feed portion 4 to supply a predetermined tension to the pre-heater 3 and the to-be-printed object 1 derived from the pre-heater 3. An out-feed portion 9 for applying a predetermined tension to the fourth print units 5 to 8, the to-be-printed object 1 sent out from the fourth print unit 8 at the final stage, and the out-feed portion; And a winding unit 10 for winding the to-be-printed object 1 after printing drawn out by (9).

The first to fourth printing units 5 to 8 are provided with a printing pan 11 in which printing ink is applied to a circumferential surface, and arranged above the printing pan 11 to print the printed matter 1 with the printing pan. The printing part 13 which has the press body 12 which press-contacts is arrange | positioned, In addition, the supply roller 14 and the discharge roller which guide the said to-be-printed object 1 to the inlet side and the outlet side of this printing part 13 ( 15) is installed. In addition, the driving motor 16 for rotating the printing plate 11 is disposed separately for each printing unit (5 to 8), and has a plurality of guide rollers 17 on the downstream side of the discharge roller (15). The dryer 18 is arrange | positioned.

Between the discharge roller 15 and the dryer 18, a mark sensor 19 for detecting the application position of the ink applied to the to-be-printed object 1, that is, the printing position, is provided in the printing unit 13, In response to the detection signal output from the mark sensor 19, the shift (scaling) of the printing position sequentially performed on the to-be-printed object 1 by the print plate 11 of each of the printing units 5 to 7 is determined. Whether or not it has occurred is determined by the correction means 21 provided in the control unit 20. Specifically, the resist marks applied to the to-be-printed object 1 by the printing plate 11 of the second to fourth printing units 6 to 8, and the first to third printing units located on the front end side thereof ( The mark sensor 19 detects the interval between the resist marks given to the to-be-printed object 1 by the printing plate | board 11 of 5-7, respectively, and the detection interval of this resist mark and the preset reference | standard interval ( For example, 20 mm) is compared by the correction means 21, and when the deviation between the detection interval of the resist mark and the reference interval is a predetermined value, for example, 1 mm or more, printing misalignment occurs in the corresponding printing unit. It is to be determined.

When the correction means 21 determines that a print shift where the deviation between the detection intervals of the resist marks of the second to fourth printing units 6 to 8 and the reference interval is greater than or equal to a predetermined value has occurred somewhere, this printing is performed. A control signal for correcting the print shift is output to the drive motor 16 of the specific unit while adjusting the plate shift phase of the printing unit (hereinafter referred to as a specific unit) where the shift has occurred. To output a control signal indicative of the adjustment direction and the adjustment amount to the correction means 22 for correcting the phasing phase in a printing unit (hereinafter referred to as a rear end unit as necessary) located at the rear end side of the specific unit. Consists of.

The correction means 22 provided in the control unit 20 adjusts the pulsating phase of the rear end unit to the same degree in the same direction as the adjustment direction when the pulsating phase of the specific unit is adjusted by the correcting means 21. After the initial correction, the phase correction amount after the initial correction is decreased over time, and the portion printed immediately after the correction of the print misalignment by the correction means 21 reaches the rear end unit. At this point in time, after recalibrating the phasing phase of the rear-end unit in the same direction as the direction of adjustment of the phasing phase set by the correction means 21, control is performed to reduce the phase correction amount after the recalibration over time. It is configured to. The recalibration amount at the time of recalibrating the phasing phase of the rear end unit in response to the adjustment amount of the phasing phase set by the correcting means 21 is between the specific unit and the rear end unit where the printing misalignment is corrected. The path length (the length of the conveying path) between the specific unit and the rear end unit is set to a value corresponding to the path length of the to-be-printed object 1, for example. If the path length is equal to, the recalibration amount is configured to be set to the same value as the initial correction amount.

The degree of reduction of the correction amount when the correction means 22 decreases the initial correction phase and the phase correction amount after recalibration is determined by the correction means 21. It is configured to be set based on the change in the amount of expansion and contraction. That is, as shown in Fig. 3, the printing misalignment in the second printing unit 6 in accordance with the detection signal output from the mark sensor (detecting means) 19 of the second printing unit 6 printing the second color. Has occurred, and when the control for correcting the printing misalignment is performed by adjusting the rotational phase of the plate 11 of the second printing unit 6 at that time, the first printing unit 5 and the second printing are executed. As for the base length L12 which consists of the full length of the to-be-printed object 1 conveyed between the units 6, only the quantity corresponding to the said correction amount stretches temporarily. Thereafter, the to-be-printed object 1 without stretching is introduced between the second and third printing units (6, 7), so that the substrate tension acting on the to-be-printed object 1 conveyed therebetween is As it changes, the amount of stretching (change amount of substrate length) of the to-be-printed object 1 gradually decreases.

Thus, when the to-be-printed object 1 whose stretch amount changed with the passage of time is introduced between the 2nd printing unit 6 and the 3rd printing unit 7 located in the back side, it originates in the change of the stretch amount. Since there is a possibility that the printing position may shift between the two printing units (6, 7), the reduction degree of the correction amount is set in correspondence with the change in the amount of expansion and contraction of the to-be-printed object 1 as described later. By gradually decreasing the phase correction amount after the initial correction and recalibration of the pulsating phase over time, the substrate tension before and after the second printing unit 6 is kept constant so that the two printing units ((6, 7) The printing misalignment between the a) is prevented.

In the gravure printing machine configured as described above, after the to-be-printed object 1 derived from the pre-heater 3 is introduced into the printing unit 5 to print the first color, the printing units 6 to 6 disposed on the rear end side thereof. In 8), the printing after the second color is sequentially performed on the to-be-printed object 1, whereby multicolor printing is performed, and the detection signal of the mark sensor 19 provided in the second to fourth printing units 6 to 8 is obtained. According to the present invention, a printing shift occurs in which a deviation between the detection mark between the resist mark given by the printing unit on the front end side and the resist mark given by the printing unit on the rear side and a predetermined reference interval is greater than or equal to a predetermined value. Is determined.

When it is determined that a printing shift occurs in any of the second to fourth printing units 6 to 8 (specific unit), the control for correcting the printing shift by adjusting the pulsation phase of the specific unit is correction means. At the same time, the phasing phase of the rear end unit is initially corrected to the same direction in the same direction as the direction of adjustment of the phasing phase in the specific unit, and then, based on a preset correction amount setting table or calculation data, or the like. The control means for reducing the phase correction amount after the initial correction with the passage of time is executed by the correction means 22.

For example, in response to a detection signal output from the mark sensor 19 of the second printing unit 6 printing the second color on the printed object 1, a resist mark indicating the printing position of the first color and It is determined that the interval between the resist marks indicating the printing position of the second color is 21 mm, and that the detection interval is only 1 mm larger than the reference interval set to 20 mm, that is, the second printing unit 6 is confirmed to be a specific unit. In this case, by temporarily lowering the rotational speed of the printing plate 11 of the second printing unit 6, as shown by the arrow A in Fig. 3, the pulsating phase of the second printing unit 6 is avoided. The phase of the plate is adjusted by displacing only 1 mm in the direction opposite to the conveying direction of the printed matter (1). Accordingly, at the time of executing the control for correcting the printing misalignment, the substrate length (the conveying length of the to-be-printed object 1) L12 between the first printing unit 5 and the second printing unit 6 is only 1 mm. The printing misalignment is corrected by being reduced.

Further, at the same time as the control for correcting the printing misalignment, the rotational speed of the printing platen 11 of the third and fourth printing units 7 and 8 located at the rear end side of the second printing unit 6 is adjusted. By dropping temporarily, the conveying direction of the to-be-printed object 1 is shown by the arrow B of FIG. 3 and FIG. 4 (b) of the plate-like phase X3 of the 3rd printing unit (rear end unit) 8. Displaces only the value (1 mm) corresponding to the phase adjusting amount of the second printing unit 6 in the reverse direction, and similarly moves the plate-like phase X4 of the fourth printing unit (rear end unit) 8 to the to-be-printed object. Only the value (1 mm) corresponding to the said initial correction amount is displaced in the reverse direction to the conveyance direction of (1). In this way, the substrate length L23 between the second printing unit 6 and the third printing unit 7 at the control execution time t0 of correcting the printing misalignment by adjusting the pulsating phase of the second printing unit 6. ) And an initial correction (phase correction) of reducing the length of the substrate on the downstream side by only 1 mm, respectively. Accordingly, the tension of the to-be-printed object 1 located between the second printing unit 6 and the third printing unit 7 and between the third printing unit 7 and the fourth printing unit 8 is increased. It is possible to prevent fluctuation under the influence of the correction operation of the phase shift in the second printing unit 6 and to prevent the occurrence of the print shift due to the variation in the tension.

As described above, the substrate length L23 between the second printing unit 6 and the third printing unit 7 and the substrate length on the downstream side thereof (the third printing unit 7 and the fourth printing unit 8). After the initial correction to reduce the substrate length) and only 1 mm, respectively, a value corresponding to the exponential curve data A2 shown in Equation (1) or FIG. On the basis of the correction amount setting table or the like, by gradually decreasing the amount of phase correction after the initial correction, a to-be-printed object generated after correction of the printing misalignment (phase adjustment control of the second printing unit 6) by the correction means 21 is performed. Corresponding to the change in the amount of expansion and contraction in (1), control is performed to change the plate motion phases X3 and X4 in the third printing unit 7 and the fourth printing unit 8.

That is, at the time point t0, the pulsation phase of the second printing unit 6 is adjusted so that the printing misalignment is corrected, whereby the substrate length between the first printing unit 5 and the second printing unit 6 ( L12) expands and contracts, and the amount of expansion A2 is represented by an exponential curve as shown in equation (1). For example, as shown in Fig. 4 (a), it changes over time. On the other hand, in Equation (1), X12 represents the pulsation phase adjustment amount of the second printing unit 6 performed at the time point t0, and V represents the conveying speed (m / s) of the to-be-printed object 1. , S12 denotes the path length between the first printing unit 5 and the second printing unit 6.

A2 = X12 · ｘｐ [-(V / S12) · ｔ]

The data A2 shown in FIG. 4A shows the path length between the first printing unit 5 and the second printing unit 6 and between the second printing unit 6 and the third printing unit 7. In the printing press in which the path lengths 12 are set to 8333 mm and the conveyance speed of the substrate 1 (substrate 1) is set to 833.3 mm / s, in order to correct printing misalignment in the second printing unit 6. For example, when control is performed to adjust the plate phase in a direction in which the length of the substrate 1 of the substrate 1 positioned between the first and second printing units 5 and 6 is shortened by only 1 mm. The amount of expansion and contraction A2 changes with the passage of time t, and the like. From this data A2, at the execution time t0 of the control for correcting the print shift, the substrate tension between the first printing unit 5 and the second printing unit 6 (acts on the to-be-printed object 1) Tension) decreases in accordance with the adjustment operation of the pulsation phase, so that after the temporary occurrence of a shortening of only 1 mm of the substrate length L12 occurs, the distortion is resolved as time elapses. It can be seen that.

Subsequently, the printing portion stretched by performing the printing part immediately after the correction of the printing misalignment by the correction means 21 (adjustment of the plate motion phase in the second printing unit 6), that is, the correction of the printing misalignment is performed. 4 (b) and FIG. 4 at a time point t1 at which it is detected whether or not the portion has reached the third printing unit 7 by a timer or the like and the print portion has reached the third printing unit 7. As shown in 4 (c), the plate motion phases X3 and X4 of the third and fourth printing units 7 and 8 are respectively arranged in the same direction as the adjustment direction of the plate motion phase set by the correction means 21. Recalibration, and the recalibration amount (R31, R41) between the second printing unit (6) and the third and fourth printing units (7, 8) located at the rear end side (1) After setting to a value corresponding to the path length of), based on a preset correction amount setting table or calculation data, etc., The control is performed to reduce the correction amounts of the plate motion phases X3 and X4 over time.

For example, in a normal printing press in which the path lengths of the to-be-printed material 1 between the first to fourth printing units 5 to 8 are all set at equal intervals, a time point when a predetermined time set by the timer has elapsed is passed. At t1, as in the case of the initial correction, by temporarily lowering the rotational speed of the printing plate 11 of the third and fourth printing units 7, 8, the third and fourth printing units 7, 8 which displaces only the values R31 and R41 (= X12) corresponding to the adjustment amounts X12 of the plate phases in the second printing unit 6 in the same direction. Correction is performed (see arrow B in FIG. 3). Therefore, as shown in FIGS. 4B and 4C, between the second printing unit 6 and the third printing unit 7 and between the third printing unit 7 and the fourth printing unit 8. After the recalibration for reducing the substrate length by only 1 mm at each time point t1, in the control? Correction means 22 for gradually reducing the phase correction amount as time t elapses from this time point t1. Run

After the recalibration performed at the time point t1, the pulsating phase X3 of the third printing unit 7 and the pulsating phase X4 of the fourth printing unit 8, which change over time, are expressed by the following equation. It is represented by (2) and (3). In Equations (2) and (3), A2 represents the amount of change in the substrate length between the first printing unit 5 and the second printing unit 6 obtained in Equation (1), and A3 is The amount of change in the substrate length between the second print unit 6 and the third print unit 7 obtained by the equation (4) shown in equation (1) is shown.

X3 = A2 + X12

X4 = A2 + A3

A3 = X12 [[S23 / S12]] · Ev [-(V / S12) · (ｔ-ｔｄ23)]

In addition, whether or not the printing portion immediately after the correction of the printing shift by the correction means 21 (adjustment of the pulsating phase in the second printing unit 6) has reached the fourth printing unit 7 or not. Is detected by a timer or the like, and at the time t2 at which the arrival is detected, the pulsation phase X4 of the fourth printing unit 8 is the same as the adjustment direction of the pulsation phase set by the correction means 21. Recalibration twice to recalibrate in the direction, and this recalibration amount R42 is a path of the to-be-printed object 1 between the third printing unit 6 and the fourth printing unit 8 located at the rear end side thereof. After setting to a value corresponding to the length, the control to reduce the phase correction amount after the recalibration with the passage of time t based on the correction amount setting table or calculation data set in advance according to Equation (3). Run

On the other hand, according to the detection signal output from the mark sensor 19 of the second printing unit 6 printing the second color on the to-be-printed object 1, the resist mark indicating the printing position of the first color and the second color In the case where it is determined that the interval between the resist marks indicating the printing position is 19 mm and it is confirmed that 1 mm smaller than the reference interval 20 mm, the rotation speed of the printing plate 11 of the second printing unit 6 is increased, The path length of the substrate between the first printing unit 5 and the second printing unit 6 by displacing the plate-like phase of the second printing unit 6 only 1 mm in the conveying direction of the to-be-printed object 1 By increasing the conveyance length of (1) by only 1 mm, control for correcting the print misalignment is executed. In addition, at the same time as the correction control of the printing misalignment (adjustment of the platen phase in the second printing unit 6), the rotation speed of the printing platen 11 of the third and fourth printing units 7 and 8 is temporarily adjusted. By performing the initial correction which raises, the plate | board phases X3 and X4 of the 3rd and 4th printing units 7 and 8 correspond to the correction amount of the said printing misalignment in the conveyance direction of the to-be-printed object 1 ( 1mm) only.

Further, by performing the initial correction, the substrate length between the second printing unit 6 and the third printing unit 7 and between the third printing unit 7 and the fourth printing unit 8 is only 1 mm, respectively. After increasing, based on the above-mentioned equations (2) and (3), control is performed to reduce the phase correction amount after the initial correction over time based on a correction amount setting table or calculation data set in advance. . Subsequently, when it is detected that the printing portion immediately after the correction of the printing misalignment by the correction means 21 has reached the third printing unit 7, the third and fourth printing units 7 and 8 are detected. Recalibrates the plate motion phases X3 and X4 in the same direction as the adjustment direction of the plate power set by the correction means 21, and the recalibration amount is positioned at the second printing unit 6 and the rear end side thereof. After setting to the value corresponding to the path length of the to-be-printed object 1 between the 3rd and 4th printing units 7 and 8, the correction amount set in advance according to said Formula (2) and Formula (3) is set. On the basis of the table or calculation data, the control for reducing the phase correction amount after the recalibration with time, that is, the plate motion phases X3 and X4 of the third and fourth printing units 7 and 8, the origin (0). The control close to the () direction is executed.

As described above, the plurality of printing units 5 to 8 are arranged along the conveyance path of the to-be-printed object 1, and the printing plate 11 installed in each of the printing units 5 to 8 is driven by the drive motor 16. In a gravure rotoprinter configured to sequentially perform printing on the to-be-printed object 1 by being individually rotated respectively, detecting printing positions sequentially applied to the to-be-printed object by the printing pulsation of each of the printing units 5 to 8. In the case where it is determined that a printing shift has occurred based on the detection means composed of the mark sensor 19 and the printing position detected by the detection means, the printing shift is adjusted by adjusting the pulsation phase of the specific unit in which this printing shift has occurred. Correcting means 21 for correcting and correcting means 22 for correcting the pulsating phase of the printing unit located on the rear end side of the printing unit in which the printing misalignment is corrected. At the time when adjustment of the plate phase is performed by the correction means 21, the initial plate correction phases X3 and X4 of the printing unit on the rear end side are initially corrected to the same degree in the same direction as the adjustment direction. The phase correction amount is reduced with time, and the correction means (at the time when the printed portion reaches the printing unit on the rear end immediately after correction of the printing misalignment by the correction means 21) is performed. After recalibrating the pulsating phases (X3, X4) of the printing unit on the rear end side in the same direction as the adjusting direction of the pulsating phase set by 21), the control for reducing the phase correction amount after the recalibration with time is described above. It is configured to execute in the correction means 22. Therefore, when correct | amending the printing shift | offset | difference performed to the to-be-printed object 1 with a simple structure, it can effectively prevent that the influence on a rear end side unit.

That is, at the time t0 at which it is confirmed that a printing deviation occurs in accordance with the detection signal output from the mark sensor (detecting means) 19 of the second printing unit 6 which prints the second color as described above, the printing deviation is detected. In the case where the control for correcting the printing misalignment is performed by adjusting the pulsating phase of the generated second printing unit 6, the to-be-printed object located between the first printing unit 5 and the second printing unit 6. As shown by the dotted line in Fig. 3, (1) stretches temporarily large and the substrate length L12 changes, and this amount of expansion and contraction gradually decreases with time.

Therefore, at the time t0 at which the printing misalignment is corrected, the plate-like phases X3 and X4 of the third and fourth printing units 7 and 8 located on the rear end side of the second printing unit 6 are described. By performing the initial correction by changing the same degree in the same direction as the correction direction of printing misalignment, the second and third printing units 6 and 7 and the third and fourth printing units ( 2nd printing unit by preventing the tension of the to-be-printed object 1 located between 7, 8), and keeping the base tension between each printing unit 6, 7 and 7, 8 constant. The printing position of (6) and the printing positions of the third and fourth printing units 7 and 8 can each be exactly matched. By reducing the phase correction amount after the initial correction in response to the amount of expansion and contraction of the to-be-printed object 1 positioned between the first printing unit 5 and the second printing unit 6 gradually decreasing with time, The substrate tension between the printing units 6, 7 and 7, 8 can be kept constant so that printing misalignment can be effectively suppressed.

Further, immediately after the correction of the printing misalignment by the correction means 21 is performed, the portion printed by the second printing unit 6, that is, the printing portion stretched in accordance with the correction of the printing misalignment is the third on the rear end side. At the time point t1 at which the printing unit 7 is reached, by recalibrating the pulsating phase X3 of the third printing unit 7 in the same direction as the adjusting direction of the pulsating phase set by the correction means 21 ( (B) R31 in FIG. 4 (b)), the influence of the expansion and contraction corresponding to the correction of the printing misalignment is prevented from affecting the printing unit 7 on the rear end side, and the printing position in the second printing unit 6 Since the print positions in the third and fourth print units 7 and 8 can be exactly matched, the print shift caused by correcting the print shift in the second print unit 6 is the third on the rear end side. It can effectively prevent the occurrence in the printing unit 7. Further, at the same time as the recalibration operation of the third printing unit 6, as shown in R41 of FIG. 4C, the pulsating phase X4 of the fourth printing unit 8 is changed to the third printing unit 7. By recalibrating to the same degree in the same direction as), it is possible to keep the substrate tension between each printing unit 6, 7 and (7, 8) constant. There is an advantage not to occur in the unit 8.

Immediately after correcting the printing misalignment as described above, at the time point t1 at which the portion printed in the second printing unit 6 reaches the third printing unit 7 on the rear end side, the plate motion phase is corrected again (R31, R41), the substrate tension is changed between the second printing unit 6 and the third printing unit 7 and the third printing unit 7 and the fourth printing unit 8 so that the substrate length varies. As shown in the data A3 of 4 (a), the to-be-printed object 1 located between the 2nd printing unit 6 and the 3rd printing unit 7 respond | corresponds to said recalibration R31, R41. In addition to being temporarily stretched, the amount of expansion changes over time. Therefore, after performing the recalibration, the amount of expansion and contraction of the to-be-printed object 1 corresponds to a gradual decrease with the passage of time, and according to the equations (2) and (3), the preset correction amount setting table or calculation data Etc., by performing control to reduce the phase correction amount after recalibration, i.e., control to bring the plate motion phases X3 and X4 closer to the origin (0) direction, thereby printing the second printing unit 6 and the third printing. The expansion and contraction of the to-be-printed object 1 positioned between the unit 7 and the third printing unit 7 and the fourth printing unit 8 can be suppressed, respectively, and the occurrence of printing misalignment can be effectively prevented.

Further, at the time t2 when the portion printed in the second printing unit 6 reaches the fourth printing unit 8 which is the last stage immediately after the correction of the printing misalignment is performed, the correction means 21 By recalibrating twice to correct the pulsating phase X4 of the fourth printing unit 8 in the same direction as the adjusting direction of the set pulsating phase (see R42 in Fig. 4 (c)), the second printing unit ( Since the printing position of 6) and the printing position of the fourth printing unit 8 can be exactly matched, the printing misalignment caused by correcting the printing misalignment in the second printing unit 6 is the last stage. There is an advantage that it does not occur in the fourth printing unit (8).

Immediately after correcting the printing misalignment, at the time t2 at which the portion printed in the second printing unit 6 reaches the fourth printing unit 8, the recalibration of the plate phase is performed twice (R42). As the substrate tension varies between the third printing unit 7 and the fourth printing unit 8 and the substrate length varies, as shown in the data A4 of FIG. 4A, the third printing unit ( After the to-be-printed object 1 located between 7) and the fourth printing unit 8 is temporarily stretched in response to the recalibration, the amount of stretching is changed with the passage of time t. For this reason, from the time point t2 at which the second recalibration is performed, the amount of expansion and contraction of the to-be-printed object 1 gradually decreases with the passage of time t, and is set according to the above equation (3). Alternatively, based on the calculation data or the like, control to reduce the phase correction amount after the recalibration is performed so that the to-be-printed object 1 located between the third printing unit 7 and the fourth printing unit 8 is stretched. Can prevent the occurrence of print misalignment.

On the other hand, in the above embodiment, in the ordinary printing machine in which the lengths of the to-be-printed objects 1 between the first to fourth printing units 5 to 8 are all set at equal intervals, the first set by the correction means 21 2 An example has been described in which the adjustment amount of the pulsation phase in the printing unit 6 and the recalibration amount when recalibrating the pulsation phases X3 and X4 of the printing units 7 and 8 on the rear end side are set to the same value. When the path lengths of the to-be-printed object 1 between the first to fourth printing units 5 to 8 are not equal to each other, the second printing unit 6 correcting the misalignment of the recalibration amount is used. And the path length S12 of the to-be-printed object 1 between the first printing unit 5 located on the front end side thereof, and the third printing unit 7 located on the second printing unit 6 and the rear end side thereof. It is preferable to set to a value corresponding to the ratio of the path length S23 of the to-be-printed object 1).

For example, a special printing machine in which the path length between the second printing unit 6 and the third printing unit 7 is set to twice the path length between the first printing unit 5 and the second printing unit 6. In a printing press in which the path length on the downstream side of the second printing unit 6 is doubled upstream of the second printing unit 6 due to the printing of the printing unit on the rear end side of the second printing unit 6 being omitted, or by a timer or the like. 5 (b) and at a time point t1 at which it is confirmed that the printed portion has reached the third and fourth printing units 7 and 8 on the rear end side immediately after the set predetermined time has elapsed and the printing misalignment has been corrected. As shown in Fig. 5C, the plate-like phases X3 and X4 of the third and fourth printing units 7 and 8 are displaced only by a value (2 mm) corresponding to twice the initial correction amount set to 1 mm. After the recalibration R31 and R41 are executed, a control for gradually reducing the phase correction amount as time t elapses from this time point t1 is given to the correction means 22. To run.

When the path length on the downstream side of the second printing unit 6 and the path length on the upstream side are different as described above, when the phase correction amounts R31 and R41 at the time of the recalibration are set to a value different from the initial correction amount. By this recalibration, the tension of the to-be-printed object 1 located on the upstream side of the third printing unit 7 fluctuates, and the influence thereof affects the downstream side. The correction amount of the plate-like phase X3 of the third printing unit 7 corresponding to the change in the substrate length L12 between the (6) and the third printing unit 7 is represented by the following formula (5) and formula ( It is set to the value shown in 6). On the other hand, in the equations (5) and (6), X12 represents the correction amount of the plate motion phase of the second printing unit 6 performed at the time point t0, and S23 represents the second printing unit 6. ), And the path length between the third printing unit 7 and td23 indicates that the portion printed by the second printing unit 6 immediately after the printing misalignment is corrected at the time point t0 is the second printing unit 6. Time until reaching the third printing unit 7 is shown. In Fig. 5 (a), A3 represents the amount of change in the substrate length L23 that occurs between the second printing unit 6 and the third printing unit 7 under the influence of the recalibration, and the following equation (7) Is represented by.

X3 = A2 + B3 + X12

B3 = X12 · [(S23 / S12) -1] · exp [-(V / S12) · (ｔ-td23)]

A3 = X12 · [(S23 / S12)] · exp [-(V / S12) · (ｔ-td23)]

Further, the path length S23 between the second print unit 6 and the third print unit 7 is equal to 1 of the path length S12 between the first print unit 5 and the second print unit 6. The path length S23 on the downstream side of the second printing unit 6 becomes 1 on the upstream side by the printing of a special printing machine set to / 2 or the upstream printing unit of the second printing unit 6 is omitted. In the printing machine set to / 2, as the predetermined time set by the timer or the like has elapsed, for example, at a time t1 at which it is confirmed that the printed portion has reached the printing unit on the rear end immediately after correcting the printing shift, for example, As shown in Fig. 6 (b) and Fig. 6 (c), the plate-like phases X3 and X4 of the third and fourth printing units 7 and 8 correspond to 1/2 of the initial correction amount (1 mm). Recalibration (R31, R41) is performed to displace only the value (0.5 mm). Then, as the time t elapses from the time point t1, a correction amount setting table or arithmetic data set in advance according to the equations (5) and (6) is corrected according to the equations (5) and (6). On the basis of the above, it is preferable to perform the control to gradually decrease the correction means 22. In this case, # 3 in the above formula (5) becomes a value in the positive direction (extension direction), as shown in Fig. 6A.

The recalibration amounts R31 and R41 at the time of recalibrating the pulsation phases X3 and X4 of the printing units 7 and 8 on the rear end side in response to the adjustment amount of the pulsation phase set by the correction means 21 as described above. Corresponding to the path length S23 of the to-be-printed object 1 between the second printing unit 6 on which the printing misalignment is corrected and the third and fourth printing units 7 and 8 located on the rear end side thereof. According to the configuration set to the value, when the path length S12 of the substrate between the specific unit and the upstream printing unit and the path length S23 of the substrate between the specific unit and the printing unit at the rear end are different Also in this case, when the stretched and printed object 1 is conveyed from the printing unit 6 to the printing units 7 and 8 by adjusting the plate phase, the amount of stretching of the printed object 1 changes. Therefore, there is an advantage that the occurrence of printing misalignment caused can be effectively prevented.

That is, when the path length S23 between the second printing unit 6 and the third printing unit 8 is large, the shift of the printing position due to the change in the amount of expansion and contraction of the to-be-printed object 1 is at the rear end side. It occurs remarkably in the printing units 7 and 8. In addition, when the path length S23 between the second printing unit 6 and the third printing unit 8 is small, the change in the printing position in the printing units 7 and 8 on the rear end side tends to be small. Therefore, correspondingly, by changing the recalibration amounts R31 and R41 at the time of recalibrating the plate-like phases X3 and X4 of the printing units 7 and 8 on the rear end side in correspondence therewith, It is possible to effectively prevent the occurrence of printing misalignment caused by the amount of expansion and contraction.

In addition, as shown in the above embodiment, the amount of expansion and contraction of the to-be-printed object 1 that is changed after the correction of the printing misalignment by the correction means 21 is performed, that is, shown in Equation (1), Fig. 4A, and the like. In the case where the phase correction amounts of the initial correction and the recalibration of the plate motion phases X3 and X4 are continuously reduced in correspondence with the exponential curve, the amount of expansion and contraction of the to-be-printed object 1 changes with time t. By decreasing the phase correction amount after the initial correction in correspondence with the gradual decrease, the amount of expansion and contraction of the to-be-printed object 1 and the correction amounts of the plate motion phases X3 and X4 in the third and fourth printing units 7 and 8 are determined. Since it can be matched correctly, there exists an advantage that the generation of the printing shift | offset | difference resulting from the amount of expansion and contraction of the said to-be-printed object 1 changing with progress of time t can be reliably prevented.

On the other hand, after the initial correction and recalibration of the plate motion phases X3 and X4 are performed by the correction means 22, the phase correction amount after the initial correction and recalibration may be changed stepwise over time. In this case, it is possible to effectively prevent the occurrence of print misalignment due to the change in the amount of expansion and contraction of the to-be-printed object 1 after the initial correction and recalibration of the plate-like phases X3 and X4. have. For example, as shown in Fig. 7 (b) and Fig. 7 (c), the average value of the amount of expansion and contraction of the to-be-printed object 1 that is changed after the correction means 21 corrects the printing misalignment is calculated for each predetermined time. Corresponding to this average value, the phase correction amount after the initial correction and re-calibration may be changed in steps every predetermined time. According to this configuration, after performing the initial correction and recalibration of the pulsating phases (X3, X4), it is not necessary to execute a complicated control of frequently changing the phase correction amount after the initial correction and recalibration. There is an advantage that it is possible to effectively prevent the occurrence of printing misalignment caused by the change in the amount of expansion and contraction in (1).

In the said embodiment, the resist mark given to the to-be-printed object 1 by the printing pan 11 of the 2nd-4th printing units 6-8 of the rear end side, and the 1st-agent located in the front-end side 3 By comparing the detection interval of the resist marks given to the printed object 1 by the printing plate 11 of the printing units 5 to 7 with a preset reference interval, it is determined that a printing shift has occurred in the corresponding printing unit. Examples of applying the present invention to a general gravure rotoprinter, a so-called printing machine for performing a sequence tracking type, have been described. However, a resist mark applied to the to-be-printed object 1 at the top of the first printing unit 5, On the basis of the interval between the resist marks applied to the to-be-printed object 1 by the printing plate 11 of the second to fourth printing units 6 to 8 on the rear end side, printing shift occurs in the corresponding printing unit, respectively. To determine whether a message has been made It is possible to apply the present invention even for special wheeling gravure printing press, the printing press performs a so-called catching first color cutting of the track type.

In the printing press which performs the measurement of the said one color tracking type, when it is determined that the printing shift | deviation occurred in the 2nd printing unit 6 based on the printing position detected by the detection means which consists of the mark sensor 19, As shown in FIG. 8 at the time point t0, the printing shift X2 of the second printing unit 6 in which the printing shift has occurred is corrected, the printing shift is corrected, and the state is continuously maintained. At the same time as the adjustment start of the plate motion phase (X2), the phase after the initial correction after initially correcting the plate motion phases of the third and fourth printing units (7, 8) on the rear end to the same degree in the same direction as the adjustment direction. Since only the control for reducing the correction amounts X3 and X4 over time is executed by the correction means 21 and the correction means 22, the subsequent recalibration is not performed. Phosphorus There is a difference with the wedge.

In other words, in the printing press that performs the above-described order tracking type, the printing is performed at the time t0 when it is detected that a printing shift occurs in the second printing unit 6, as shown in Fig. 4B. By adjusting the phase, the tension of the to-be-printed object 1 between the 1st printing unit 5 and the 2nd printing unit 6 changes, and the small shift | offset | difference to the position of the resist mark provided by the 2nd printing unit 6 is changed. Occurs. For this reason, the resist mark provided by the 2nd printing unit 6 and the 3rd printing are not performed when the printing part to which the said resist mark was given reached the 3rd printing unit 6, without performing the said recalibration. On the basis of the detection interval between the resist marks provided in the unit 7, if it is determined whether or not the printing position is shifted, there is a possibility that an accurate determination cannot be made. Therefore, at the time point where the print portion to which the resist mark has been applied in the second printing unit 6 reaches the third printing unit 6, the re-correction is performed, whereby the resist mark applied in the second printing unit 6 is performed. On the basis of the detection interval between the resist marks given by the third printing unit 7, it is possible to accurately determine whether or not the printing position is shifted.

On the other hand, in the printing machine which measures the said one color tracking type, the resist mark given to the to-be-printed object 1 by the 1st printing unit 5 which is the uppermost part, and the 2nd-4th printing units 6 of the rear end side 6 Since it is comprised so that it may determine that the printing shift generate | occur | produced in the corresponding printing unit based on the space | interval between the resist marks respectively given to the to-be-printed object 1 by the printing board 11 of -8), the said 2nd printing At the time t0 when it is detected that printing misalignment has occurred in the unit 6, even when a small misalignment occurs in the position of the resist mark given by the second printing unit 6 due to the adjustment of the plate-phase phase X2. The second to fourth printing units 6 to 8 on the rear end side are not affected by the second mark on the rear end side, based on the resist marks applied to the to-be-printed object 1 in the first printing unit 5 at the uppermost end. Accurately determine whether print misalignment has occurred There.

Therefore, when it is determined that the printing misalignment has occurred in the second printing unit 6 on the basis of the printing position detected by the detection means made up of the mark sensor 19 as described above, it is shown in FIG. 8 at this time point t0. As shown, the printing shift is corrected by adjusting the plate shift phase X2 of the second printing unit 6 in which the printing shift has occurred, and the third and fourth parts on the rear end side are the same in the same direction as the adjustment direction. The correction means 21 and the correction means 22 only control for initially correcting the plate motion phases X3 and X4 of the printing units 7 and 8 and then reducing the phase correction amount after the initial correction in time. By carrying out the above, there is an advantage that the influence of the influence on the rear end unit can be effectively prevented when correcting the printing shift that is sequentially performed on the to-be-printed object 1 with a simple configuration.

For example, it is assumed that, in the printing press that performs the measurement of the one-color tracking type, a printing shift occurs in the second printing unit 6 based on the printing position detected by the detecting means made of the mark sensor 19. If the phase correction of the third and fourth printing units 7 and 8 on the rear end side is not performed by adjusting only the plate plate phase X2 of the second unit 6 where the printing misalignment has occurred, As a result of experiments for detecting the state of print misalignment (Y2 to Y4) occurring in the four printing units 6 to 8, as shown in Fig. 9, the third and fourth printing units 7 and 8 on the rear end side were used. It was confirmed that significant printing shifts (Y3, Y4) occurred.

In addition, in the printing machine which performs the measurement of the said one color tracking type, while adjusting the pulsating phase X2 of the 2nd unit 6 which assumed the printing shift | offset | difference generate | occur | produced, it is the same degree to the same direction as the adjustment direction. After correcting the plate motion phases X3 and X4 of the third and fourth printing units 7 and 8 on the rear end side, the amount of phase correction after the correction is reduced in accordance with the passage of time, and further, the scale of the sequence tracking type is measured. In the case where the plate-like phases X3 and X4 of the third and fourth printing units 7 and 8 are recalibrated at a predetermined time point as in a printing machine that performs the following operation, as shown in FIG. In the four printing units 7 and 8, it was confirmed that large printing shift | offsets Y3 and Y4 arise sequentially.

On the other hand, the printing misalignment of the second unit 6 in which the printing misalignment occurs as described above is adjusted to correct the printing misalignment, and the third and fourth parts at the rear end are the same in the same direction as the adjustment direction. After correcting the plate motion phases X3 and X4 of the printing units 7 and 8 and then performing control to reduce the phase correction amount after the correction in response to the passage of time, as shown in FIG. In the third and fourth printing units 7 and 8, the occurrence of printing deviations Y3 and Y4 was mostly not seen.

Therefore, in the printing press which performs the measurement of the one-color tracking type, it is determined that the printing shift has occurred in the second printing unit 6 based on the printing position detected by the detection means composed of the mark sensor 19 (t0). In Fig. 8, as shown in Fig. 8, the printing discrepancy is corrected by adjusting the plate shift phase X2 of the second unit 6 in which the printing misalignment has occurred, and the rear end side is the same in the same direction as the adjustment direction. The correction means 21 for controlling only the phase correction amounts X3 and X4 of the third and fourth printing units 7 and 8 in the initial stage, and then reducing the phase correction amount after the initial correction as time passes. And the correction means 22, it can be seen from the above experimental data that generation of printing misalignment can be effectively suppressed.

According to the invention according to claim 1, by performing an initial correction to change the phantom phase of the printing unit located at the rear end side to the same degree in the same direction as the correction direction of the print shift, at the time when the print shift is corrected, The printing position in the printing unit on the front end side by preventing the tension of the to-be-printed object placed between each printing unit in response to the stretching of the to-be-printed body and keeping the substrate tension between each printing unit constant; The printing positions in the printing unit on the rear end side can be exactly matched, respectively. Then, at the time when the printed portion reaches the rear end unit immediately after the correction of the printing misalignment by the correcting means, by recalibrating the pulsating phase of the rear end unit in the same direction as the adjustment direction of the plate phase Since the printing position in the specific unit and the printing position in the rear end unit can be exactly matched while keeping the substrate tension between the printing units constant, the print misalignment is corrected in the specific unit. By performing control to reduce the amount of phase correction after recalibration so as to effectively prevent the printing misalignment from occurring in the rear end unit and to prevent the change of the substrate tension by recalibrating the plate phase. It is possible to suppress the stretching of the to-be-printed objects located between the printing units, respectively, There is the advantage that the production can be effectively prevented.

Further, according to the invention according to claim 2, even when the path length of the substrate between the specific unit and the upstream printing unit and the path length of the substrate between the specific unit and the printing unit at the rear end are different, By adjusting the plate phase, when the stretched to-be-printed object is conveyed from the specific unit to the rear end side unit, there is an advantage that it is possible to effectively prevent the occurrence of printing misalignment caused by the change in the amount of stretching of the to-be-printed object.

In addition, according to the invention according to claim 3, the correction means successively reduces the phase correction amount of the initial correction and the recalibration of the plate-like phase in correspondence with the amount of expansion and contraction of the to-be-changed object after the printing misalignment is corrected. There is an advantage that it is possible to reliably prevent the occurrence of printing misalignment caused by the amount of expansion and contraction.

Further, according to the invention according to claim 4 and 5, after performing the initial correction and recalibration of the plate phase, the complicated control such as frequently changing the phase correction amount after the initial correction and recalibration is executed. There is no need to effectively prevent the occurrence of print misalignment caused by the change in the amount of stretching of the to-be-printed object.

According to the invention according to claim 6, the printing misalignment occurs based on the distance between the resist mark applied to the to-be-printed object in the printing unit at the uppermost end and the resist mark applied to each of the to-be-printed object by the printing phantom of the printing unit at the rear end. In a printing machine that performs a so-called one-color tracking type, which is configured to judge whether or not the printing misalignment is corrected, the pulsating phase of the printing unit located on the rear end side at the time of correcting the printing misalignment in the same direction as the correcting direction of the printing misalignment. By performing the initial correction to change to the same degree, the tension of the to-be-printed object placed between each printing unit is changed according to the expansion and contraction of the to-be-printed object, and the printing of the front end side is maintained by keeping the substrate tension between each printing unit constant. The print position of the unit coincides with the print position of the print unit on the rear end, respectively. You can.

Claims (6)

In the control apparatus of the gravure rotoprinter, in which a plurality of printing units are arranged along the conveyance path of the to-be-printed object, and the printing pans provided in each of the printing units are individually driven to rotate by a drive motor so that printing is sequentially performed on the to-be-printed object. , Detecting means for detecting a printing position applied to the object to be printed by printing pans of each printing unit; Correction means for correcting the print shift by adjusting the phantom phase of the print unit in which the print shift has occurred, when occurrence of print shift is detected by the detection means; Correction means for correcting the phantom phase of the printing unit located at the rear end side of the printing unit in which the printing shift is corrected, Here, the correcting means initially corrects the pulsating phase of the printing unit on the rear end to the same degree in the same direction as the adjustment direction at the time when the pulsating phase is adjusted by the correcting means, and then after the initial correction The phase correction amount is decreased in response to the passage of time, and at the point where the printed portion reaches the printing unit on the rear end immediately after the correction of the printing misalignment by the correction means is made, the phasing phase set by the correction means is adjusted. And a control for reducing the phase correction amount after the recalibration with the passage of time after the recalibration of the pulsating phase of the printing unit on the rear end side in the same direction as the direction. 2. The recalibration amount according to claim 1, wherein the recalibration amount at the time of recalibrating the pulsation phase of the printing unit on the rear end side in response to the adjustment amount of the pulsation phase set by the correction means is The path length between the printing unit correcting the printing misalignment and the printing unit located on the front end side thereof, and the distance between the printing unit correcting the printing misalignment and the printing unit located on the rear end side thereof. A control apparatus for a gravure rotoprinter, characterized by setting to a value corresponding to a ratio between path lengths of printed matter. 3. A method according to claim 1 or 2, wherein the initial correction and phase correction amount after recalibration of the plate motion phase are reduced in correspondence with the change in the amount of stretching of the to-be-printed object generated after the correction of the printing misalignment by the correction means. Control device of gravure rotoprinter. 3. The control apparatus for a gravure printing press according to claim 1 or 2, wherein the phase correction amount is changed in steps when the correction means reduces the phase correction amount after the initial correction and recalibration of the pulsating phase. 4. The apparatus for controlling a gravure printing press according to claim 3, wherein the phase correction amount is changed in steps when the correction means decreases the phase correction amount after the initial correction and the recalibration of the pulsating phase. A plurality of printing units are arranged along the conveyance path of the to-be-printed object, and the printing pans provided in each of the printing units are individually driven to rotate by a drive motor, so that the printing apparatus can be sequentially printed on the to-be-printed object. In Detection means for detecting a printing position performed on the object to be printed by printing pans of each printing unit; Detecting that printing misalignment has occurred on the basis of the interval between the resist mark applied to the to-be-printed object in the printing unit of the uppermost end detected by the detecting means and the resist mark applied to each of the to-be-printed by the printing pano of the printing unit at the rear end side. Correcting means for correcting the printing misalignment by continuously adjusting the pulsation phase of the printing unit in which the printing misalignment has occurred, and continuously maintaining the state; Correction means for correcting the phantom phase of the printing unit located at the rear end side of the printing unit in which the printing shift is corrected, The correction means corrects the phasing phase of the printing unit on the rear end to the same degree in the same direction as the adjustment direction at the time when the correction phase is started by the correction means, and then decreases the phase correction amount over time. A control apparatus for a gravure rotoprinter, characterized in that for executing a control to make a control.

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