JP2018111217A - Print controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an adjustment load of a parameter and control a phase in an appropriate tension range, and to suppress quality degradation of a material.SOLUTION: An additional print correction section 21 of a print controller 1 counts a reference pulse signal between timing of a mark signal and timing of an additional print origin signal, and generates an additional print correction pulse signal. A subtraction section 23 determines a phase difference (phase difference obtained by reflecting a deviation amount of a position of additional printing) obtained by reflecting the additional print correction pulse signal. A phase control section 26 performs count processing according to the phase difference, and generates a phase correction command according to a count value. The phase control section 26 does not count the signal in a tensioning direction when a tension value exceeds an upper limit value, and does not count the signal in a direction of loosening the tension when the tension value exceeds a lower limit value. An additional print speed command obtained by adding a phase correction command to a reference speed command is output to an electric motor for an additional print roll.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a print control apparatus that performs phase control for printing on a predetermined portion of a material.

  2. Description of the Related Art Conventionally, there has been known a print control apparatus that feeds a sheet-like material and performs printing at a predetermined position of the material using a plate cylinder. This printing control device allows a material to run at a predetermined speed on a reference roll, and when printing is performed with a plate cylinder of the printing roll in a state where the printing roll is rotated at the same speed as the material, the material is arranged at regular intervals. An apparatus for controlling the phase of a printing roll based on a printed mark.

  The material printed by this printing control apparatus is, for example, a film, paper, and the like, and expands and contracts due to temperature, humidity, and the like, and the material may expand and contract due to a difference in printing conditions. For this reason, there is a problem that the interval between marks printed on the material at regular intervals expands and contracts and the accuracy of the printing position on the material by the plate cylinder decreases.

  In order to solve such a problem, generally, a method of aligning marks by phase control by a compensator roll or sectional drive is known. However, these systems cannot control the tension of the material and may damage the product.

  In order to solve this problem, a technique for adjusting the tension of a material using a roll provided in a preceding stage of a printing roll is disclosed (for example, see Patent Documents 1 and 2). Specifically, the printing control apparatus obtains the mark position deviation by detecting the mark on the material, and adjusts the tension by controlling the preceding roll so that the mark position deviation is reduced.

JP 2005-324386 A Japanese Patent No. 4660204

  However, the method of controlling the mark misalignment using tension control has low responsiveness, and many defective products are generated before the mark misalignment is eliminated, and the accuracy of the position (printing accuracy) is also common. Compared with the position control method.

  In order to increase the printing accuracy, the above-described general phase control method is more effective. However, when the tension of the material changes, the quality may be deteriorated. From the viewpoint of material quality, it is better not to change the tension as much as possible. In particular, if the phase of the printing roll is suddenly changed while the reference roll that drives the material and the printing roll that performs printing on the material are rotated at the same speed, the tension of the material suddenly changes and the material becomes loose. If it is pulled strongly, the material will be adversely affected. As a result, such phase control has been a factor of reducing the quality of the material.

  In order to solve such a problem, it is desirable to always run the material within an appropriate tension range by limiting the phase control operation according to the tension of the material.

  For example, a method of adjusting the phase control response or the like so as not to affect the tension of the material, that is, so as not to change the phase of the material abruptly can be considered. For example, in order to limit the command for the printing roll, a limit is provided for the phase control or the gain is reduced. However, in this method, it is necessary to adjust an appropriate parameter according to the material, and there is a problem that adjustment is difficult, for example, it takes a long time for the adjustment.

  Accordingly, the present invention has been made to solve the above-mentioned problems, and its purpose is to reduce parameter adjustment load and perform phase control within an appropriate tension range to suppress deterioration in material quality. Is to provide a simple print control apparatus.

  In order to solve the above-described problem, the printing control apparatus according to claim 1 is configured to perform printing at a predetermined printing position based on a rotation speed of a reference roll for running the material and a mark printed on the material. In order to match the rotation speed of the roll, a phase correction command is generated, and a printing speed command is generated by adding the phase correction command to a reference speed command that determines the rotation speed of the reference roll. Based on the above, in the printing control apparatus for controlling the rotation of the printing roll, the mark printed on the material is detected, and a mark detector that outputs a mark signal at the detected timing, and the tension value of the material are detected. Tension sensor, the mark signal output from the mark detector, and the timing at which the rotational position arrives at a predetermined reference position every time the printing roll rotates once. A correction unit that generates a print correction pulse signal that reflects the amount of printing deviation with respect to the predetermined print position based on a print origin signal that indicates printing, and a count based on the print correction pulse signal generated by the correction unit To obtain a count value, generate a phase correction command reflecting the count value, add the phase correction command generated by the phase control unit to the reference speed command, and print speed An addition unit for obtaining a command, wherein the phase control unit changes the rotation speed of the printing roll when the reference roll rotates at the speed of the reference speed command, thereby the tension value of the material. When the tension value detected by the tension detector exceeds a preset upper limit value, based on the print correction pulse signal, When the tension value exceeds a preset lower limit value, the print correction pulse signal is calculated when the tension value is exceeded by counting in the direction of loosening the tension of the material. Based on the above, do not count in the direction of loosening the tension of the material, count in the direction of tensioning the material to obtain a count value, and generate the phase correction command reflecting the count value, Features.

  According to a second aspect of the present invention, the print control apparatus according to the first aspect further includes a subtracting unit, wherein the correction unit inputs the mark signal and the print origin signal. The reference pulse signal reflecting the rotation speed of the reference roll is counted to obtain a count value in a time period between the count value and a preset value when printing is performed at the count value and the predetermined printing position. The difference between the count value is calculated, the print correction pulse signal reflecting the difference is generated, and the subtraction unit subtracts the print correction pulse signal generated by the correction unit from the reference pulse signal Generating a corrected reference pulse signal, subtracting a reprint pulse signal reflecting the rotation speed of the printing roll from the corrected reference pulse signal, A phase difference between the printing roll and the printing roll, and the phase control unit counts based on the phase difference obtained by the subtraction unit instead of counting based on the print correction pulse signal. It is characterized by that.

  According to a third aspect of the present invention, in the print control apparatus according to the second aspect, the new subtracting unit in place of the subtracting unit is a follow-up unit that reflects the rotation speed of the printing roll from the reference pulse signal. Subtracting the printing pulse signal, obtaining a phase difference between the reference roll and the printing roll, the phase control unit, instead of counting based on the printing correction pulse signal, the obtained by the subtraction unit The print correction pulse signal generated by the correction unit is subtracted from the phase difference to obtain a subtraction result, and counting is performed based on the subtraction result.

  As described above, according to the present invention, it is possible to reduce the parameter adjustment load and perform phase control within an appropriate tension range, and as a result, it is possible to suppress deterioration in material quality. .

1 is a schematic diagram illustrating a configuration example of an entire system including a print control apparatus according to an embodiment of the present invention. 1 is a block diagram illustrating a configuration example of a print control apparatus according to an embodiment of the present invention. It is a figure explaining the example of a printing position. 6 is a time chart for explaining an operation example of the print control apparatus. It is a flowchart which shows the process example of a phase control part.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
[Overall system]
First, an overall system including a print control apparatus according to an embodiment of the present invention will be described. FIG. 1 is a schematic diagram illustrating a configuration example of an entire system including a print control apparatus according to an embodiment of the present invention.

  This system includes a printing control apparatus 1, a reference roll 3, a reprint printing roll 4, a tension detector 5, a mark detector 6, a reference roll motor 7, a reprint printing roll motor 8, and a PG (pulse generator) 9, 10 is comprised. This system is an apparatus for performing additional printing on the material 2 on which printing has been performed in advance. This additional printing is called “reprint printing”.

  The material 2 travels at a constant speed in the direction of the arrow while being sandwiched between the rolls in each of the reference roll 3 and the reprint printing roll 4 provided on the downstream side of the reference roll 3. Marks are printed on the material 2 at regular intervals. With the material 2 traveling at a constant speed, the reprint printing roll 4 that rotates at the same speed as that of the material 2 is used as the reference for the mark printed on the material 2 to perform the reprint printing at a predetermined printing position.

  The print control device 1 is a device that controls the phase of the reprint printing roll 4 (rotational control of the reprint printing roll 4) in order to perform reprint printing at a predetermined printing position of the material 2. The print control apparatus 1 receives a tension detection signal reflecting the tension value of the material 2 from the tension detector 5, and when the mark printed on the material 2 is detected by the mark detector 6, A mark signal at that timing is input from the detector 6.

  The print control device 1 generates a reference speed command for causing the material 2 to travel at a predetermined speed by rotating the reference roll 3 at a predetermined speed, and outputs the reference speed command to the reference roll motor 7. Then, the printing control apparatus 1 inputs a reference pulse signal that reflects the rotation speed of the reference roll 3 (the traveling speed of the material 2 and the reference speed) from the PG 9.

  The print control device 1 generates a reprint speed command (print speed command) for rotating the reprint print roll 4 at a predetermined speed, and outputs the reprint speed command to the reprint print roll motor 8. Then, the print control apparatus 1 inputs a reprint pulse signal reflecting the rotation speed (reprint speed) of the reprint printing roll 4 from the PG 10.

  As basic control, the printing control apparatus 1 determines the pulse amount of the reference pulse signal and the pulse amount of the reprint pulse signal in order to completely match the traveling speed of the material 2 and the rotational speed of the reprint printing roll 4. Compare Then, the printing control apparatus 1 generates a phase correction command so that both pulse amounts are the same, and adds the phase correction command to the reference speed command that is the reference of the traveling speed of the material 2 to give the reprint speed command. And the rotational speed of the additional printing roll 4 is corrected. That is, the printing control apparatus 1 controls the rotational speed of the follow-up printing roll 4 to follow the traveling speed of the material 2.

  When such follow-up control is performed, the rotational speed of the reprint printing roll 4 may change suddenly, and the tension of the material 2 may change suddenly. In such follow-up control, the material 2 may be loosened or pulled strongly, and the quality of the material 2 may be degraded.

  Therefore, in the embodiment of the present invention, the print control apparatus 1 generates a reprint speed command so that the tension of the material 2 is within an appropriate tension range when performing the above-described follow-up control. Details will be described later.

  The reference roll 3 rotates the pair of rolls at a speed based on the reference speed command from the print control apparatus 1 and causes the material 2 inserted between the pair of rolls to travel in the direction of the arrow. As a result, the material 2 travels at a speed based on the reference speed command.

  The reprint printing roll 4 sandwiches the traveling material 2 with a pair of rolls, and rotates the pair of rolls at a speed based on a reprint speed command from the print control device 1. Then, the reprint printing roll 4 performs reprint printing at a predetermined printing position based on the mark on the material 2 by a plate provided on the plate cylinder of one of the rolls.

  Here, the reprint printing roll 4 rotates at the same speed as the traveling speed of the material 2, that is, at the same speed as the reference speed command, at the timing when the reprint printing is performed. On the other hand, the follow-up printing roll 4 rotates at a speed different from the traveling speed of the material 2, that is, at a speed different from the reference speed command, by the phase control by the print control device 1 at other timings. The printing position is changed so that additional printing is performed at the position. As a result, according to the rotation of the supplementary printing roll 4, appropriate printing is periodically performed at a predetermined printing position based on the mark on the material 2.

  The tension detector 5 detects the tension acting on the material 2, generates a tension detection signal reflecting the tension value, and outputs the tension detection signal to the print control apparatus 1.

  The mark detector 6 detects marks printed on the material 2 at regular intervals, generates a mark signal at the timing when the mark is detected, and outputs the mark signal to the print control apparatus 1.

[Print control device 1 / Configuration]
Next, the print control apparatus 1 shown in FIG. 1 will be described in detail. FIG. 2 is a block diagram illustrating a configuration example of the print control apparatus 1 according to the embodiment of the present invention. The print control apparatus 1 includes a follow-up origin signal generation unit 20, a follow-up correction unit 21, subtraction units 22 and 23, a tension upper limit determination unit 24, a tension lower limit determination unit 25, a phase control unit 26, a limiter 27, and a multiplication unit 28. And an adder 29.

  As described above, the printing control apparatus 1 performs the overprinting with the pulse amount of the reference pulse signal in order to make the traveling speed of the material 2 (the rotational speed of the reference roll 3) completely coincide with the rotational speed of the overprinting roll 4. The reprint speed command is generated so that the pulse amount of the pulse signal is the same. Further, the printing control apparatus 1 generates a reprint speed command so that the tension of the material 2 is within an appropriate tension range.

  The reprinting origin signal generation unit 20 inputs a reprinting pulse signal reflecting the rotational speed of the reprinting printing roll 4 from the PG 10, specifies a reprinting origin signal (printing origin signal) from the reprinting pulse signal, The reprint origin signal is output to the reprint correction unit 21. The reprinting origin signal is a signal that is output every time the reprinting printing roll 4 rotates, and that indicates the timing at which the rotational position arrives at a predetermined reference position.

  The reprinting correction unit 21 receives a reprinting origin signal from the reprinting origin signal generation unit 20 and a mark signal from the mark detector 6, and further, a reference in which the rotation speed of the reference roll 3 is reflected from PG 9. Input a pulse signal.

  The reprint correction unit 21 includes a counter, and counts the reference pulse signal in a time period between the timing when the mark signal is input and the timing when the reprint origin signal is input.

  The count value in this time period is a value indicating the position of reprint printing on the material 2, and the count value α indicating the position when the reprint printing is appropriately performed can be set in advance.

  The reprint correction unit 21 calculates a difference between the count value in this time period and a preset count value α, and reprint correction pulse signal (print correction pulse signal, correction speed) reflecting the difference. , And outputs a follow-up correction pulse signal to the subtractor 22.

  This reprint correction pulse signal is a signal reflecting a deviation of the correct timing of the reprint origin signal with respect to the mark signal due to the material 2 being loosened or strongly pulled, that is, the position of reprint printing. This signal reflects the amount of deviation. On the basis of the reprint correction pulse signal, the displacement of the reprint printing position is corrected.

  When the reprint printing is performed correctly (when the reprint printing is performed at the correct position), the difference between the count values is 0, and the reprint correction pulse signal is not output. That is, the correction speed is zero. On the other hand, when reprint printing is not performed correctly (when reprint printing is not performed at the correct position), the difference between the count values is not 0, and the reprint correction pulse signal corresponding to the deviation amount is not generated. Is output.

  When the position of the reprint printing is shifted in the traveling direction of the material 2, the reason is that the reprint printing timing is fast. In this case, a positive follow-up correction pulse signal is generated. On the other hand, when the position of the reprint printing is shifted to the opposite side with respect to the traveling direction of the material 2, this is because the timing of the reprint printing is late. In this case, a negative follow-up correction pulse signal is generated.

  The subtractor 22 receives the reference pulse signal from PG 9 and also receives the reprint correction pulse signal from the reprint correction unit 21. Then, the subtraction unit 22 subtracts the follow-up correction pulse signal from the reference pulse signal and outputs the subtraction result to the subtraction unit 23 as a corrected reference pulse signal.

  The subtracting unit 23 receives the corrected reference pulse signal from the subtracting unit 22 and also receives a reprint pulse signal from the PG 10. Then, the subtractor 23 subtracts the follow-up pulse signal from the corrected reference pulse signal, and outputs the subtraction result to the phase controller 26 as a phase difference FB (feedback).

  The phase difference FB is a value that reflects the amount of shift in the position of additional printing. When the position of the reprint printing is shifted in the traveling direction of the material 2, it is because the timing of the reprint printing is fast, and the phase difference of the reprint printing roll 4 with respect to the reference roll 3 is positive. In this case, a positive reprint correction pulse signal is output from the reprint correction unit 21, and a negative phase difference FB is output from the subtraction unit 23. On the other hand, if the position of the reprint printing is shifted to the opposite side with respect to the traveling direction of the material 2, this is because the timing of the reprint printing is late, and the phase difference of the reprint printing roll 4 with respect to the reference roll 3 is Negative. In this case, a negative additional printing correction pulse signal is output from the additional printing correction unit 21, and a positive phase difference FB is output from the subtraction unit 23.

  The tension upper limit determination unit 24 inputs a tension detection signal reflecting the tension value of the material 2 from the tension detector 5 and also inputs a preset upper limit value, and the tension value exceeds the upper limit value. When the value is larger than the upper limit value, the signal exceeding the upper limit is output to the phase control unit 26.

  The tension lower limit determination unit 25 inputs a tension detection signal reflecting the tension value of the material 2 from the tension detector 5 and also inputs a preset lower limit value, and the tension value exceeds the lower limit value. When it is smaller than the lower limit value, a signal exceeding the lower limit is output to the phase control unit 26.

  FIG. 5 is a flowchart illustrating a processing example of the phase control unit 26. The phase control unit 26 inputs the phase difference FB from the subtraction unit 23, inputs an upper limit excess signal from the tension upper limit determination unit 24, and inputs a lower limit excess signal from the tension lower limit determination unit 25 (step S501).

  The phase control unit 26 includes a counter. When the signal exceeding the upper limit and the signal exceeding the lower limit are not input (step S502: N, step S503: N), the phase control unit 26 determines that the phase difference FB is positive when the phase difference FB is positive (step S504: +). Count to the plus side so as to be 0 (step S505). The count value increases as the absolute value of the phase difference FB increases, and increases as the absolute value of the phase difference FB decreases. When the phase difference FB is positive, the corrected reference pulse signal (reference speed)> reprinting pulse signal (reprinting speed), that is, the phase of the reprint printing roll 4 with respect to the reference roll 3 is delayed. Due to the positive count value, the tension of the material 2 changes in the tensioning direction.

  On the other hand, when the signal exceeding the upper limit and the signal exceeding the lower limit are not input (step S502: N, step S503: N), the phase control unit 26 determines that the phase difference FB is negative (step S504:-). It counts to the minus side so that FB becomes 0 (step S506). The count value becomes a larger negative value as the absolute value of the phase difference FB is larger, and becomes a smaller negative value as the absolute value of the phase difference FB is smaller. The phase difference FB being negative means that the corrected reference pulse signal <reprinting pulse signal, that is, the phase of the reprint printing roll 4 with respect to the reference roll 3 is advanced. Due to the negative count value, the tension of the material 2 changes in the direction of relaxation. It is not counted when the phase difference is zero.

  When the signal exceeding the upper limit is input (step S502: Y), the phase control unit 26 does not count to the positive side when the phase difference FB is positive (step S507: +) (step S508). Further, when the phase difference FB is negative (step S507:-), the phase control unit 26 performs counting to the negative side (step S509). Thereby, when the tension value of the material 2 exceeds the upper limit value, the count in the direction to increase the rotation speed of the reprint printing roll 4 provided on the downstream side with respect to the reference roll 3, that is, the count in the direction in which the tension is applied. Is not performed, and the phase correction command is maintained at the previous positive value.

  When the signal exceeding the lower limit is input (step S503: Y), the phase control unit 26 counts to the positive side when the phase difference FB is positive (step S510: +) (step S511). Further, when the phase difference FB is negative (step S510:-), the phase control unit 26 does not count to the negative side (step S512). Thereby, when the tension value of the material 2 exceeds the lower limit value, the count in the direction to decrease the rotation speed of the reprint printing roll 4 provided on the downstream side with respect to the reference roll 3, that is, the count in the direction to loosen the tension. Is not performed, and the phase correction command is maintained at the previous negative value.

  The phase control unit 26 proceeds from step S505, step S506, step S508, step S509, step S511, or step S512, generates a phase correction command corresponding to the count value, and outputs it to the limiter 27 (step S513). The phase correction command is a positive command when the count value is positive (when the phase difference of the reprint printing roll 4 with respect to the reference roll 3 is negative), and when the count value is negative (the reprint printing roll 4 with respect to the reference roll 3). When the phase difference is positive), it becomes a negative command.

  Returning to FIG. 2, the limiter 27 receives the phase correction command from the phase control unit 26, and when the phase correction command is within the preset upper limit value and lower limit value range, the limiter 27 sends the phase correction command to the multiplication unit 28. Output. On the other hand, when the phase correction command exceeds the upper limit value (when larger than the upper limit value), the limiter 27 outputs the upper limit value to the multiplication unit 28 as the phase correction command. Further, when the phase correction command exceeds the lower limit value (when smaller than the lower limit value), the limiter 27 outputs the lower limit value to the multiplication unit 28 as the phase correction command.

  The multiplier 28 receives the post-limiter phase correction command from the limiter 27, multiplies the post-limiter phase correction command by a preset gain K, and outputs the post-multiplication phase correction command to the adder 29.

  The addition unit 29 receives the phase correction command from the multiplication unit 28 and the reference speed command that is the set value of the traveling speed of the material 2, adds the phase correction command to the reference speed command, and reprints the addition result. Generated as a speed command.

  The print control apparatus 1 outputs a follow-up printing speed command to the follow-up printing roll motor 8 and outputs a reference speed command to the reference roll motor 7.

  In this way, the printing control apparatus 1 makes the pulse amount of the reference pulse signal and the pulse amount of the reprint pulse signal the same in order to make the traveling speed of the material 2 and the rotation speed of the reprint printing roll 4 completely coincide. A reprint speed command is generated so that When the position of the reprint printing on the material 2 is shifted due to expansion / contraction of the material 2, the reprint correction unit 21 generates a reprint correction pulse signal reflecting the shift amount, and the subtraction unit 23 calculates a phase difference FB reflecting the deviation.

  When the phase control unit 26 generates the phase correction command based on the phase difference FB, if the tension value of the material 2 exceeds the upper limit value, the phase control unit 26 does not count in the direction in which the tension is applied, and the previous phase The correction command was maintained. Further, when the tension value of the material 2 exceeds the lower limit value, the phase control unit 26 does not count the direction in which the tension is relaxed and maintains the previous phase correction command. The phase correction command is added to the reference speed command, and is output to the reprint printing roll motor 8 as a reprint speed command.

  As a result, the phase control unit 26 generates a reprint speed command so that the tension of the material 2 falls within the proper tension range, and as a result, it is possible to suppress the quality deterioration of the material 2.

[Print control device 1 / operation]
Next, the operation of the print control apparatus 1 shown in FIG. 2 will be described. FIG. 3 is a diagram for explaining an example of the print position, and FIG. 4 is a time chart for explaining an operation example of the print control apparatus 1.

  As shown in the uppermost part of FIG. 3, it is assumed that the mark m and the print a are printed on the material 2 in advance. Further, the reprint printing roll 4 prints the reprint printing b on the mark m at a predetermined printing position (the same traveling timing position, the center position in the circle of the printing a at the same traveling timing position as the mark m). Shall be.

  Now, as in the first printing shown in FIG. 3A, it is assumed that the position of the additional printing b is shifted to the opposite side with respect to the traveling direction (arrow) with reference to the mark m. In this case, the print control apparatus 1 needs to increase the follow-up printing speed command and increase the rotation speed of the follow-up printing roll 4.

  The reprinting correction unit 21 counts the reference pulse signal in the time period between the input timing of the mark signal and the reprinting origin signal after completion of the first printing, and the positional deviation amount of the reprinting printing b. Find the count value that reflects. Then, the reprint correction unit 21 generates a positive reprint correction pulse signal P1 shown in FIG. 4 (1) as a trapezoid pattern having an area corresponding to the count value.

  The reprint correction pulse signal P1 is a correction speed corresponding to a reprint speed command for eliminating the positional deviation amount of the reprint printing b. Here, if the pattern of the follow-up correction pulse signal P1 is a pattern that changes rapidly, the rotational speed of the follow-up printing roll 4 changes abruptly, and the tension of the material 2 changes abruptly. For this reason, by making the pattern of the follow-up correction pulse signal P1 trapezoidal, the rapid change in the rotational speed of the follow-up printing roll 4 is eliminated, and the tension of the material 2 is prevented from changing suddenly.

  Thereby, the phase control unit 26 inputs the phase difference reflecting the trapezoidal follow-up correction pulse signal P1 for each sampling on the time axis, and generates a phase correction command. Then, a reprint speed command reflecting the phase correction command is output from the print control apparatus 1 to the reprinting print roll motor 8.

  The reprint pulse signal P2 in FIG. 4B input from the PG 10 of the reprint printing roll 4 is a trapezoidal pattern signal slightly delayed from the reprint correction pulse signal P1 in FIG.

  As the follow-up correction pulse signal P1 rises, the follow-up speed command increases, and the follow-up pulse signal P2 rises. Then, the rotational speed of the follow-up printing roll 4 becomes higher than the rotational speed of the reference roll 3 (follow-up printing speed> reference speed), and as a result, the tension detection signal (tension value) P3 in FIG. . When the tension detection signal P3 exceeds the upper limit value (see P3-1 in FIG. 4 (3)), the tension upper limit determination unit 24 outputs the upper limit excess signal P4 in FIG. 4 (4).

  If it does so, the phase control part 26 will input the signal P4 exceeding an upper limit, the count of the direction which tension | tensile_strength will be stopped, and a previous phase correction command will be maintained. Thereby, the rotational speed of the follow-up printing roll 4 is maintained, and the follow-up printing pulse signal P2 becomes constant without increasing (see P2-1 in FIG. 4B).

  When the follow-up correction pulse signal P1 falls, the follow-up speed command becomes smaller, the follow-up pulse signal P2 falls, and the tension detection signal P3 also falls. When the tension detection signal P3 falls below the upper limit value, the tension upper limit determination unit 24 does not output the upper limit excess signal P4.

  As described above, when the position of the reprint printing b is shifted to the opposite side of the traveling direction of the material 2, the reprint correction unit 21 generates the reprint correction pulse signal P1 corresponding to the shift amount, and the phase control unit. 26 generates a phase correction command reflecting the phase difference corresponding to the follow-up correction pulse signal P1 within a range in which the tension detection signal does not exceed the upper limit value, and the print control apparatus 1 adds the follow-up correction according to the phase correction command. Print speed command is output. Here, when the tension detection signal exceeds the upper limit value, the phase correction command is maintained and the reprint speed command is also maintained. That is, when the tension detection signal exceeds the upper limit value, the phase correction command does not reflect the follow-up correction pulse signal P1 corresponding to the shift amount, and as a result, a predetermined amount of shift remains.

  Therefore, after the second printing is completed, the print control apparatus 1 generates a reprint correction pulse signal corresponding to the remaining shift amount, and in order to eliminate the shift amount, the reprint speed command is increased and the reprint printing is performed. The rotational speed of the roll 4 is increased.

  The position of follow-up printing b by the second printing shown in FIG. 3B is smaller than that in FIG. 3A, but is shifted to the opposite side of the traveling direction (arrow) with respect to the mark m. . As described above, this is a deviation remaining because the tension detection signal P3 exceeds the upper limit value and the phase correction command is limited.

  The reprinting correction unit 21 counts the reference pulse signal in the time period between the input timing of the mark signal and the reprinting origin signal after the second printing is completed, and the positional deviation amount of the reprinting printing b. Find the count value that reflects. Then, the reprint correction unit 21 generates a reprint correction pulse signal P5 shown in FIG. 4A as a trapezoid pattern having an area corresponding to the count value.

  The phase control unit 26 receives the phase difference reflecting the follow-up correction pulse signal P5 and generates a phase correction command. Then, a reprint speed command reflecting the phase correction command is output from the print control apparatus 1 to the reprinting print roll motor 8.

  The reprint pulse signal P6 in FIG. 4B input from the PG 10 of the reprint printing roll 4 is a trapezoidal pattern signal slightly delayed from the reprint correction pulse signal P5 shown in FIG.

  As the follow-up correction pulse signal P5 rises, a constant value is maintained and lowered, the follow-up printing speed command increases, becomes a constant value, and decreases. In this case, it is assumed that the tension detection signal P7 in FIG. 4 (3) does not exceed the upper limit value. No signal exceeding the upper limit is output from the tension upper limit determination unit 24.

  As a result, the phase control unit 26 generates a phase correction command that reflects all the reprint correction pulse signals P5, and the print control device 1 generates a reprint speed command that reflects all the reprint correction pulse signals P5. Is output. Then, in the third printing in FIG. 3C, the shift of the reprint printing b is eliminated. For this reason, after the third printing in FIG. 3C is completed, as shown in FIG. 4, the reprint correction pulse signal and the reprint pulse signal are not generated.

  As described above, according to the print control apparatus 1 of the embodiment of the present invention, the reprint correction unit 21 performs the reference in the time period between the timing when the mark signal is input and the timing when the reprint origin signal is input. The pulse signal is counted, and a reprint correction pulse signal reflecting the difference between the count value and a preset count value α is generated.

  The subtracting unit 22 subtracts the follow-up correction pulse signal from the reference pulse signal to obtain a corrected reference pulse signal. Then, the subtracting unit 23 subtracts the follow-up printing pulse signal from the corrected reference pulse signal, and obtains a phase difference that reflects the deviation amount of the follow-up printing position.

  The phase control unit 26 performs counting according to the phase value so that the phase difference becomes 0, and generates a phase correction command according to the count value. Here, when the tension value exceeds the upper limit value, the phase control unit 26 does not count in the direction in which the tension is applied, but only counts in the direction in which the tension is relaxed, and generates a phase correction command. On the other hand, when the tension value exceeds the lower limit value, the phase control unit 26 does not count in the direction in which the tension is relaxed, but only counts in the direction in which the tension is applied, and generates a phase correction command.

  Then, a reprint speed command obtained by adding the phase correction command to the reference speed command is output from the print control apparatus 1 to the reprinting print roll motor 8.

  Here, when the position of the overprint printing of the material 2 is shifted due to expansion / contraction of the material 2, a phase correction command corresponding to the amount of the shift is generated. However, when the tension value of the material 2 exceeds the upper limit value, the phase correction command in the tensioning direction is maintained at the previous value regardless of the deviation amount, and the rotational speed of the reprint printing roll 4 is maintained. The When the tension value of the material 2 exceeds the lower limit value, the phase correction command in the direction of loosening the tension is maintained at the previous value regardless of the shift amount, and the rotational speed of the reprint printing roll 4 is maintained. .

  Thus, a reprint speed command is generated so that the tension value of the material 2 is within an appropriate tension range, the rotational speed of the reprint printing roll 4 is controlled, and the reprint printing of the material 2 is performed at an appropriate position. The Conventionally, it has been necessary to finely adjust the upper and lower limit values of the limiter 27 and the gain K of the multiplication unit 28 according to the material 2 and printing conditions so that the tension does not change suddenly. In the embodiment of the present invention, since it is not necessary to finely adjust these parameters, it is possible to reduce the adjustment load of the parameters, and as a result, in a shortest time while suppressing deterioration in the quality of the material 2 with a simple configuration. Printing misalignment can be corrected.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea thereof. In the embodiment, the phase control unit 26 of the printing control apparatus 1 receives the phase difference from the subtracting unit 23, performs a count process according to the phase difference, and generates a phase correction command according to the count value. On the other hand, the phase control unit 26 may directly input a reprint correction pulse signal from the reprint correction unit 21.

  In this case, the printing control apparatus 1 does not include the subtracting unit 22, and the reprint correction unit 21 outputs a reprint correction pulse signal to the phase control unit 26. The subtractor 23 receives the reference pulse signal from PG9 and also receives the reprint pulse signal from PG10, subtracts the reprint pulse signal from the reference pulse signal, and outputs the subtraction result to the phase controller 26 as a phase difference. . The phase control unit 26 subtracts the additional printing correction pulse signal from the phase difference, performs the same counting process as described above according to the subtraction result, and generates a phase correction command corresponding to the count value.

DESCRIPTION OF SYMBOLS 1 Print control apparatus 2 Material 3 Reference | standard roll 4 Reprint printing roll 5 Tension detector 6 Mark detector 7 Reference roll motor 8 Additional printing roll motor 9, 10 PG (pulse generator)
20 Additional printing origin signal generation unit 21 Additional printing correction unit 22, 23 Subtraction unit 24 Tension upper limit determination unit 25 Tension lower limit determination unit 26 Phase control unit 27 Limiter 28 Multiplication unit 29 Addition unit

Claims (3)

A phase correction command is generated to match the rotation speed of the reference roll for running the material with the rotation speed of the printing roll for printing at a predetermined printing position with reference to the mark printed on the material. In the printing control device that generates the printing speed command by adding the phase correction command to the reference speed command that determines the rotation speed of the reference roll, and controls the rotation of the printing roll based on the printing speed command.
A mark detector for detecting the mark printed on the material and outputting a mark signal at the detected timing;
A tension detector for detecting a tension value of the material;
Based on the mark signal output by the mark detector and a print origin signal indicating the timing at which the rotation position arrives at a predetermined reference position every time the printing roll rotates once, printing for the predetermined print position is performed. A correction unit that generates a print correction pulse signal that reflects the amount of misalignment,
A phase control unit that performs counting based on the print correction pulse signal generated by the correction unit to obtain a count value, and generates the phase correction command that reflects the count value;
An addition unit that adds the phase correction command generated by the phase control unit to the reference speed command and obtains the printing speed command;
The phase control unit
The tension detected by the tension detector when the tension value of the material changes by changing the rotation speed of the printing roll when the reference roll rotates at the speed of the reference speed command. When the value exceeds a preset upper limit value, based on the print correction pulse signal, the count value is not counted in the direction in which the tension of the material is increased, but is counted in the direction in which the tension of the material is relaxed. When the tension value exceeds a preset lower limit value, the direction in which the tension of the material is increased is not counted based on the print correction pulse signal, and the direction in which the tension of the material is increased is not counted. To obtain a count value and generate the phase correction command reflecting the count value. The print control apparatus according to claim 1,
Furthermore, a subtracting unit is provided,
The correction unit is
In a time period between the timing at which the mark signal is input and the timing at which the printing origin signal is input, a reference pulse signal that reflects the rotation speed of the reference roll is counted to obtain a count value, and the count value Calculating a difference between a preset count value when printing is performed at the predetermined printing position, and generating the print correction pulse signal reflecting the difference,
The subtraction unit
The print correction pulse signal generated by the correction unit is subtracted from the reference pulse signal to generate a corrected reference pulse signal, and the rotation speed of the printing roll is reflected from the corrected reference pulse signal. Subtract the reprint pulse signal, and obtain the phase difference between the reference roll and the printing roll,
The phase control unit
Instead of performing counting based on the printing correction pulse signal, the printing control apparatus performs counting based on the phase difference obtained by the subtracting unit. The print control apparatus according to claim 2,
A new subtraction unit that replaces the subtraction unit is:
Subtracting the reprint pulse signal reflecting the rotation speed of the printing roll from the reference pulse signal, obtaining a phase difference between the reference roll and the printing roll,
The phase control unit
Instead of counting based on the print correction pulse signal, the print correction pulse signal generated by the correction unit is subtracted from the phase difference obtained by the new subtraction unit to obtain a subtraction result, and the subtraction A printing control apparatus that performs counting based on a result.

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