JP2012166392A - Printer and printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely perform registering by an inexpensive configuration when successively performing printing on running materials by use of a plate provided on a rotating plate roll.SOLUTION: On the basis of a mark signal, printing timing signal, and impression cylinder roll position data, a printing position phase adjuster 32 sets mark position data A and printing position data B, calculates a printing interval length L, and generates a reference pulse corresponding to deviation from a printing interval set value S. At the timing of the printing timing signal, a printing position deviation detector 33 sets a set value for a counter from a reference pulse, and generates, as a plate roll position error, a counter value that decreases from the set value to zero according to the input of a plate roll FB pulse and the input of an impression cylinder roll FB pulse. The plate roll speed command generator 34 adds the result of multiplying the plate roll position error and a gain to an impression cylinder roll speed FB, thereby generating the addition result as a plate roll speed command. After performing the upper and lower limiting and lamp processing, the plate roll speed command generator 34 rotates the plate roll 3.

Description

  The present invention relates to a printing apparatus and a printing method, and more particularly, to a printing technique in which a plate roll provided with a plate is rotated and printing is sequentially performed on a traveling material for each product.

  2. Description of the Related Art Conventionally, a flexographic printing machine is known that continuously prints a sheet-like material that runs continuously at regular intervals for each product. The flexographic printing press is a rotary printing press that performs printing on a material by rotating a printing roll provided with a printing plate and supplying ink to the printing plate. Flexographic printing machines include a center drum system, a stack system, and an inline system. In particular, an inline flexographic printing press has a plate roll and an impression cylinder roll as one unit, and if the unit is added, the printing color can be increased, so that the printing color can be increased relatively easily. This is more effective than other methods.

  Such an in-line flexographic printing machine has two control systems, a fully synchronous system and a rotary system. In the fully synchronous system, the circumference of the plate roll and the product length of the printed material are set to be the same, and the plate roll and the material are synchronized, that is, the rotation speed of the plate roll and the traveling speed of the material are the same. Printing.

  On the other hand, in the rotary type, it is not necessary to set the circumference of the plate roll and the product length the same, and the printing roll is controlled by controlling the acceleration and deceleration of the plate roll itself according to the product length, with the circumference of the plate roll fixed. This is a method to be performed (see Patent Document 1). Specifically, the printing machine travels the material at a constant speed, and controls the acceleration and deceleration of the plate roll between the end of printing and the start of printing of the next product. Absorbs the difference between circumference and product length. Thereby, the plate provided on the rotating plate roll can be matched with the printing position for each product in the traveling material. For example, if the circumference of the plate roll is longer than the product length, after printing is complete, the plate roll is accelerated and decelerated or accelerated to quickly align the plate with the print start position of the next product. Decelerate after a constant speed. On the other hand, if the circumference of the plate roll is shorter than the product length, it is necessary to wait until the printing start position of the next product comes after printing is completed. Or, decelerate to stop and then accelerate.

  By the way, in a multi-color printing machine that continuously performs a plurality of printings, registration control for adjusting the printing position to the correct position is performed for the purpose of eliminating color unevenness and the like. As a printing apparatus that controls a multicolor printing machine, for example, an apparatus (first printing apparatus) is known in which one motor is connected by a line shaft and all the printing machines are operated simultaneously. The registration by this printing device is the same as the rotational speed of the plate roll and the traveling speed of the material by detecting the displacement of the printing position by using the displacement detection device and adjusting the length of the material between the printing presses. This is realized by matching the phases.

  Also known is a printing apparatus (second printing apparatus) that controls registration by accelerating and decelerating a plate roll with reference to marks printed for each product on a material (Patent Document 2). See). In this printing apparatus, the first detection means detects the mark printed on the material, the second detection means detects the detection piece attached on the endless belt provided with the plate, and the detection timing and detection of the mark Compare the detection timing of the piece and rotate the plate roll at a constant speed or acceleration / deceleration. Specifically, when both the detection timings are the same, the printing apparatus has a distance between the printing position O and the printing origin P2 of the plate, and between the printing position O and the printing origin P1 scheduled to be printed on the material. The rotational speed of the plate roll is made the same as the traveling speed of the material (refer to FIG. 2, page 19, lines 7 to 16 of Patent Document 2). On the other hand, if both detection timings are different, it is determined that both distances do not match, and the rotational speed of the plate roll is accelerated or decelerated so that both distances match (FIG. 2, page 20, pages 1 to 13). See line).

Japanese Patent Laid-Open No. 58-197084 Japanese Patent Laid-Open No. 1-110151

  However, in the first printing apparatus described above, since one motor is connected by a line shaft and a plurality of printing machines are operated simultaneously, there is a problem that the motor capacity becomes large and the machine configuration becomes complicated. . In addition, since a positional deviation detection device is used to detect the deviation of the printing position, there is a problem that the cost becomes high.

  Further, in the second printing apparatus described in Patent Document 2 described above, when the detection timing of the mark on the material and the detection timing of the detection piece on the endless belt provided with the plate are different, the printing position O The rotational speed of the plate roll is accelerated or decelerated so that the distance between the printing origin P2 of the plate and the distance between the printing position O and the printing origin P1 to be printed on the material coincide.

  However, Patent Document 2 does not describe what kind of processing is performed in order to make both distances coincide with each other, and the specific control content is unknown. The second printing device is considered to obtain the difference between both distances based on the time difference of the detection timing and to accelerate and decelerate the plate roll according to the difference, but the mark on the material and the detection piece on the endless belt are Since there is only one each, and there is also only one each of the first detection means and the second detection means, it is not possible to confirm what the difference between the two distances has become by acceleration / deceleration. That is, Patent Document 2 does not describe specific control contents for making both distances coincide with each other, and the process by the second printing apparatus cannot be specified.

  Therefore, the present invention has been made to solve the above problems, and its purpose is to perform registration control when printing is sequentially performed on a traveling material by a plate provided on a rotating plate roll. It is an object of the present invention to provide a printing apparatus and a printing method that can be reliably realized with an inexpensive configuration.

  In order to achieve the above object, a printing apparatus according to the present invention causes a material marked with a predetermined interval to travel by rotating an impression cylinder roll, and also rotates a plate roll provided with a plate, thereby causing the impression cylinder to rotate. In a printing apparatus that sequentially performs printing with the plate at a predetermined position of the material with the mark as a reference by inserting the material between a roll and the plate roll, a pressure at a predetermined constant speed is set. A cylinder roll speed command generator that generates a cylinder roll speed command and rotates the impression cylinder roll, impression cylinder roll position data indicating the rotation position of the impression cylinder roll, and a pressure indicating the rotation speed of the impression cylinder roll An original indicating that the origin detection piece has been detected from an impression cylinder roll position / speed detector for detecting cylinder roll speed feedback and a detector for detecting the origin detection piece provided on the plate roll. A mark signal indicating that the mark has been detected from a print timing signal detector that detects a print timing signal based on the origin signal, and a detector that detects the mark, and the mark signal The impression cylinder roll position data detected by the impression cylinder roll position / speed detector at the input timing and the impression cylinder roll position detected by the impression cylinder roll position / speed detector at the detection timing of the printing timing signal. Based on the data, a printing interval length on the material is calculated, a deviation between the printing interval length and a preset printing interval setting value is obtained, the deviation is set as a printing position deviation, and the plate roll A printing position deviation generator that reduces the printing position deviation to zero with rotation and rotation of the impression cylinder roll, and the impression cylinder roll position. A printing roll speed command including the printing position deviation is generated based on the value of the impression roll speed feedback detected by the speed detector, the printing roll is rotated by the printing roll speed command, and the printing position deviation is generated. And a plate roll speed command generator for accelerating / decelerating the plate roll based on the above.

  In the printing apparatus according to the present invention, the printing position deviation generator may calculate a deviation between the calculated printing interval length and a preset printing interval setting value by rotating the plate roll and the impression cylinder roll. The counter value is set to a set value of the counter that approaches zero with rotation, and the counter value is generated as a printing position deviation.

  In the printing apparatus according to the present invention, the plate roll speed command generator multiplies a printing position deviation generated by the printing position deviation generator by a predetermined value and is detected by the impression cylinder roll position / speed detector. The result of multiplication is added to the value of the pressure drum roll speed feedback, a plate roll speed command is generated based on the addition result, and the plate roll is rotated.

  In the printing apparatus according to the present invention, each time the printing position deviation generator inputs the mark signal, a mark for writing impression cylinder roll position data detected by the impression cylinder roll position / speed detector to the storage unit. At the detection timing of the position holder and the printing timing signal, the impression cylinder roll position data detected by the impression cylinder roll position / speed detector is used as the printing position data, and a mark serving as a reference for the next printing is determined. Printing position where the impression cylinder roll position data corresponding to the mark signal is read from the mark position holder and used as mark position data, and printing is performed with the material sandwiched between the impression cylinder roll and the plate roll. And a mark for calculating the print interval length based on the distance between the mark and the position of the detector for detecting the mark, the set print position data, and the mark position data. Characterized by comprising an interval length calculator, a.

  In the printing apparatus according to the present invention, the printing interval length calculator of the printing position deviation generator may store the impression cylinder roll position data corresponding to the mark signal of the mark serving as a reference for the next printing. When not written in the device, a preset print interval setting value is set as the print interval length.

  Further, in the printing apparatus according to the present invention, the printing interval length calculator of the printing position deviation generator includes a printing position where the material is inserted between the impression cylinder roll and the plate roll, and printing is performed. A printing interval length is calculated based on a distance from an installation position of a detector that detects a mark, a correction value for correcting the distance, the set printing position data, and the mark position data. .

  Further, in the printing method according to the present invention, by rotating the impression cylinder roll at a constant speed, the marked material is caused to travel at a predetermined interval, and the impression roll is rotated by rotating the impression roll provided with the plate. In the printing method in which printing is sequentially performed by the plate at a predetermined position of the material with the mark as a reference by sandwiching the material between the plate roll and the plate roll, the rotational position of the impression cylinder roll is indicated. Detecting the origin detection piece from the step of detecting impression cylinder roll position data and impression cylinder roll speed feedback indicating the rotational speed of the impression cylinder roll, and a detector for detecting the origin detection piece provided on the plate roll An origin signal indicating that the mark has been received, a print timing signal is detected based on the origin signal, and the mark is detected from a detector that detects the mark. A mark signal indicating that it has been output is input, and based on the impression cylinder roll position data detected at the input timing of the mark signal and the impression cylinder roll position data detected at the detection timing of the printing timing signal, Calculating a printing interval length, and obtaining a deviation between the printing interval length and a preset printing interval setting value, and setting the deviation as a printing position deviation, and rotating the plate roll and the impression cylinder roll The printing position deviation is reduced to zero with rotation of the printing roll, and a plate roll speed command including the printing position deviation is generated on the basis of the detected value of the impression cylinder roll speed feedback, and the printing plate deviation is generated. Rotating the plate roll according to a roll speed command, and accelerating / decelerating the plate roll based on the printing position deviation. And wherein the door.

  As described above, according to the present invention, there is no need to use an expensive positional deviation detection device provided in the conventional first printing apparatus. Therefore, it is possible to perform registration with an inexpensive configuration, and it is possible to correct a printing position shift. Further, according to the present invention, the counter value is increased or decreased with the rotation of the plate roll and the impression cylinder roll, with respect to the deviation (print position deviation) between the measured print interval length and the set print interval set value. The plate roll is accelerated / decelerated so that the counter value becomes zero, and the plate roll speed and impression cylinder roll speed (material travel speed) are reached when the counter reaches zero. Are synchronized (matched). Thereby, it is possible to reliably perform registration and eliminate the displacement of the printing position.

1 is a system diagram illustrating an overall configuration of a printing press including a printing apparatus (controller) according to an embodiment of the present invention. It is the schematic which shows the control system of a printing machine. It is a figure explaining the example of printing when performing registration. It is a block diagram which shows the structure of a controller. It is a flowchart which shows the outline | summary of the process by a controller. It is a block diagram which shows the structure of a plate roll position / speed detector. It is a figure explaining the plate roll position data detected by the plate roll position / speed detector. It is a block diagram which shows the structure of an impression cylinder roll position / speed detector. It is a block diagram which shows the structure of a printing position phase adjuster. It is a flowchart which shows the process of a printing position phase adjuster. It is a figure explaining the formula of the printing interval length L calculated by the printing interval length calculator of a printing position phase adjuster. FIG. 6 is a diagram for explaining a calculation timing of a print interval length L. FIG. 6 is a diagram for explaining calculation timing (continuation) of a print interval length L. FIG. 6 is a diagram for explaining a calculation process of a printing interval length L. It is a block diagram which shows the structure of a printing position deviation detector. It is a flowchart which shows the process of a printing position deviation detector. It is a figure which shows timing charts, such as a printing timing signal and a plate roll position error. It is a block diagram which shows the structure of a plate roll speed command generator. It is a flowchart which shows the process of a plate roll speed instruction | command generator.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of the printing press]
FIG. 1 is a system diagram showing an overall configuration of a printing press including a printing apparatus (hereinafter referred to as a controller) according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a control system of the printing press. The printing machine 20 has a predetermined position based on marks (not shown in FIG. 1, see FIG. 2) printed at regular intervals for each product on the sheet-like material 1 that runs continuously. It is a machine that performs printing sequentially. The printing press 20 includes an impression cylinder roll 2, a plate roll 3, an anilox roll 4, a mark sensor 5, an origin sensor 6, an impression cylinder roll motor 7, an impression cylinder roll encoder 8, an impression cylinder roll inverter 9, a plate roll motor 10, and a plate. A roll encoder 11, a plate roll inverter 12, and a controller 13 are provided. 1 shows one set of printing machines 20, but when performing multi-color printing, other printing machines are provided at the front and / or back of the printing machine 20.

  The material 1 is delivered from an unillustrated unwinding machine, and taken up by a winding machine (not shown) via the printing machine 20 and another printing machine provided at the front stage and / or the rear stage of the printing machine 20. In addition, the first color of the material 1 is printed by the first printer, the second color is printed by the second printer, and a predetermined color is printed for each printer. It is assumed that the material 1 on which the mark is printed is sent to the printing machine 20 shown in FIG. This mark may be printed at regular intervals for each product of a predetermined length in the material 1 by the first printer, or may be printed in advance. The controller 13 can recognize the printing reference position on the material 1 by this mark.

  The impression cylinder roll 2 and the plate roll 3 sandwich the traveling material 1, and a plate (not shown) provided on the plate roll 3 performs printing based on the mark at a predetermined position on the product in the material 1. Done. The impression cylinder roll 2 is mechanically rotated by driving of the impression cylinder roll motor 7 and causes the material 1 to travel at a constant speed. The plate roll 3 is mechanically rotated at the same constant speed as the impression cylinder roll 2 or a speed that is accelerated and decelerated by driving the plate roll motor 10. Similar to the plate roll 3, the anilox roll 4 rotates by driving the plate roll motor 10 and supplies ink for printing to the plate provided on the plate roll 3.

  The mark sensor 5 detects marks printed at regular intervals for each product of a predetermined length in the material 1 and outputs a mark signal to the controller 13. The origin sensor 6 detects an origin detection piece (not shown) provided on the plate roll 3 and outputs an origin signal indicating the origin of the rotational position of the plate roll 3 to the controller 13.

  The impression cylinder roll motor 7 is driven according to the electric power supplied from the impression cylinder roll inverter 9 and rotates the impression cylinder roll 2 to cause the material 1 to travel. The impression cylinder roll encoder 8 detects the rotation position and speed of the impression cylinder roll 2 with the rotation of the impression cylinder roll motor 7, that is, the impression cylinder roll position FB (feedback) signal for detecting the position and travel speed of the material 1. Is output to the impression cylinder roll inverter 9 and the controller 13. The impression cylinder roll inverter 9 inputs an impression cylinder roll speed command from the controller 13 and inputs an impression cylinder roll position FB from the impression cylinder roll encoder 8, and the impression cylinder roll speed calculated from the impression cylinder roll position FB is Electric power is supplied to the impression cylinder roll motor 7 so that the impression cylinder roll speed command is obtained.

  The plate roll motor 10 is driven by the electric power supplied from the plate roll inverter 12 to rotate the plate roll 3 and the anilox roll 4. The plate roll encoder 11 outputs a plate roll position FB signal for detecting the rotational position and speed of the plate roll 3 to the plate roll inverter 12 and the controller 13 as the plate roll motor 10 rotates. The plate roll inverter 12 receives a plate roll speed command from the controller 13 and also inputs a plate roll position FB from the plate roll encoder 11, and the plate roll speed calculated from the plate roll position FB becomes the plate roll speed command. Thus, electric power is supplied to the plate roll motor 10.

  The controller 13 inputs a mark signal from the mark sensor 5, an origin signal from the origin sensor 6, an impression cylinder roll position FB from the impression cylinder roll encoder 8, and a plate roll position FB from the plate roll encoder 11. Then, the controller 13 outputs a pressure drum roll speed command having a preset constant speed to the pressure drum roll inverter 9. Thereby, the impression drum roll 2 rotates at a constant speed, and the material 1 travels at a constant speed.

  Further, the controller 13 from the input mark signal, origin signal, impression cylinder roll position FB, and plate roll position FB from the position on the material 1 where the current printing is performed to the position on the material 1 where the next printing is performed. The printing interval length L is calculated. A method for calculating the print interval length L will be described later. Then, the controller 13 obtains an initial deviation between the calculated printing interval length L and a preset printing interval setting value S, and sets this initial deviation as a setting value of the counter. The counter value of this counter increases and decreases according to the pulses generated by the impression cylinder roll position FB and the plate roll position FB as the impression cylinder roll 2 and the plate roll 3 rotate. Then, the controller 13 adds a multiplication result obtained by multiplying the printing position deviation, which is a counter value, by a gain to the impression cylinder roll speed FB calculated from the impression cylinder roll position FB, and sends it to the plate roll inverter 12 as a plate roll speed command. Output. That is, the controller 13 makes the counter value corresponding to the printing position deviation as the counter value so that the counter value becomes zero with the rotation of the impression drum roll 2 and the plate roll 3, that is, the printing position deviation becomes zero. A roll speed command is output to the plate roll inverter 12.

  Thereby, the plate roll 3 rotates at the same constant speed as the impression cylinder roll 2 when the printing position deviation becomes zero by accelerating / decelerating the rotation speed according to the printing position deviation. Therefore, by accelerating and decelerating the plate roll 3, the phase shift between the impression cylinder roll 2 and the plate roll 3 can be corrected. When the printing position deviation becomes zero, the plate roll 3 has the same constant speed as the impression cylinder roll 2. Therefore, the phases of the impression drum roll 2 and the plate roll 3 can be matched. That is, by such registration, the displacement of the printing position is corrected, and the plate of the plate roll 3 can be aligned with the position on the material 1 having the printing interval length L.

[Outline of registration operation]
Next, an outline of the registration operation by the controller 13 shown in FIGS. 1 and 2 will be described. FIG. 3 is a diagram illustrating an example of printing when registration is performed. As shown in FIG. 3, it is assumed that a mark (dotted square) is printed on the material 1 for each product length. (1) to (7) indicate individual products on the material 1, and the material 1 travels in the right direction.

  (A) shows a situation where the mark is not detected by the mark sensor 5 and the phase is not matched. Since the controller 13 does not input a mark signal from the mark sensor 5, the controller 13 cannot calculate the print interval length L. For this reason, the controller 13 sets the preset printing interval set length S to the printing interval length L so that the printing position deviation becomes zero and generates the same plate roll speed command as that of the impression cylinder roll 2. Thereby, since the plate roll 3 rotates at the same constant speed as the impression cylinder roll 2, the phase shift of the impression cylinder roll 2 and the plate roll 3 cannot be corrected, and the phases are not matched. As shown in (a), the deviation between the mark for each product length (dotted line square) and the printed portion (solid line square) becomes smaller as the transition from (1) to (4) occurs. It turns out that it becomes large according to the shift from (7) to (7).

  (B) is a situation where the mark is detected by the mark sensor 5 and the phase is matched by accelerating / decelerating the plate roll 3 (the mark sensor distance is not correct, that is, the installation location of the mark sensor 5 is incorrect, This shows the situation where the deviation remains. As shown in FIG. 2, the mark sensor distance refers to the distance between the position where the mark sensor 5 is installed and the sandwiching position (printing position) between the impression cylinder roll 2 and the plate roll 3 in the material 1. The controller 13 can input a mark signal from the mark sensor 5. Therefore, the controller 13 calculates a printing interval length L from the mark signal, the origin signal, the impression cylinder roll position FB, and the plate roll position FB, and generates a plate roll speed command for accelerating / decelerating the plate roll 3. Then, the controller 13 generates a plate roll speed command so that the counter value of the counter having the initial deviation between the printing interval length L and the printing interval setting length S as a setting value becomes zero. When the counter value becomes zero, a plate roll speed command for rotating the plate roll 3 at the same constant speed as the impression cylinder roll 2 is generated. Thereby, the plate roll 3 synchronizes with the impression drum roll 2 and the phase is matched.

  As shown in (b), according to the transition from (1) to (4), the distance between the mark and the printed portion is shortened by the acceleration / deceleration of the plate roll 3, but after (5) the quantitative deviation is It can be seen that it remains. This quantitative deviation is caused by the mark sensor distance not being correct, that is, the installation location of the mark sensor 5 is not correct. After (5), the plate roll 3 rotates at a constant speed and a certain amount of deviation remains, but it can be seen that the plate roll 3 is synchronized with the impression drum roll 2 and in phase.

  (C), when the mark is detected by the mark sensor 5 and the plate roll 3 is accelerated and rotated at a constant speed, the plate roll 3 is decelerated so that the phase is matched. It shows a situation where the speed is constant (the mark sensor distance is correct, that is, the installation location of the mark sensor 5 is correct). Similarly to (b), the controller 13 inputs a mark signal from the mark sensor 5, calculates a printing interval length L, and issues a plate roll speed command for accelerating the plate roll 3 according to the printing interval length L. After that, a plate roll speed command is generated so that the counter value of the counter becomes zero. When the counter value becomes zero, a plate roll speed command for rotating the plate roll 3 at the same constant speed as the impression cylinder roll 2 is generated. Thereby, the plate roll 3 synchronizes with the impression drum roll 2 and the phase is matched.

  As shown in (c), as the shift from (1) to (4) occurs, the deviation between the mark and the printed portion is reduced by the acceleration of the plate roll 3, and in (4) the phase is matched and deceleration is completed. It can be seen that the deviation is zero. Further, in the transition from (4) to (7), the plate roll 3 rotates at a constant speed and the deviation is maintained at zero, and the plate roll 3 is synchronized with the impression drum roll 2 and is in phase. It can be seen that there is no quantitative deviation.

  In (d), a mark is detected by the mark sensor 5, and the plate roll 3 is decelerated and rotated at a constant speed to be accelerated so that the phases match. It shows a situation where the speed is constant (the mark sensor distance is correct, that is, the installation location of the mark sensor 5 is correct). Similarly to (b) and (c), the controller 13 inputs a mark signal from the mark sensor 5, calculates the printing interval length L, and depresses the plate roll 3 according to the printing interval length L. A roll speed command is generated, and then a plate roll speed command is generated so that the counter value of the counter becomes zero. When the counter value becomes zero, a plate roll speed command for rotating the plate roll 3 at the same constant speed as the impression cylinder roll 2 is generated. Thereby, the plate roll 3 synchronizes with the impression drum roll 2 and the phase is matched.

  As shown in (d), as the shift from (1) to (4) occurs, the deviation between the mark and the printed portion is reduced by the deceleration of the plate roll 3, and in (4) the phase is aligned and the plate roll 3 is It turns out that it becomes the same speed as the impression cylinder roll 2, and the deviation is zero. Further, in the transition from (4) to (7), the plate roll 3 rotates at a constant speed and the deviation is maintained at zero, and the plate roll 3 is synchronized with the impression drum roll 2 and is in phase. You can see that

[Configuration of controller]
Next, with respect to the controller 13 shown in FIGS. 1 and 2, the configuration and processing for performing the registration shown in FIG. 3 will be described in detail. FIG. 4 is a block diagram showing the configuration of the controller 13. The controller 13 includes a plate roll control unit 30 and an impression drum roll control unit 40. The plate roll control unit 30 includes a plate roll position / speed detector 31, a printing position phase adjuster 32, a printing position deviation detector 33, and a plate roll speed command generator 34. The impression cylinder roll control unit 40 includes an impression cylinder roll position / speed detector 41 and an impression cylinder roll speed command generator 42. The print position phase adjuster 32 and the print position deviation detector 33 constitute a print position deviation generator.

  The controller 13 inputs an origin signal from the origin sensor 6, a plate roll position FB from the plate roll encoder 11, a mark signal from the mark sensor 5, and an impression cylinder roll position FB from the impression cylinder roll encoder 8. Then, the plate roll control unit 30 of the controller 13 generates a plate roll speed command and outputs it to the plate roll inverter 12, and the impression cylinder roll control unit 40 generates a preset pressure drum roll speed command at a constant speed. And output to the impression cylinder roll inverter 9.

[Controller processing]
Next, an outline of processing by the controller 13 shown in FIG. 4 will be described. FIG. 5 is a flowchart showing an outline of processing by the controller 13. First, the plate roll position / speed detector 31 of the plate roll control unit 30 provided in the controller 13 inputs an origin signal from the origin sensor 6 and also inputs a plate roll position FB from the plate roll encoder 11, From the plate roll position FB, a plate roll FB pulse corresponding to a change in the value of the plate roll position FB is generated, and a print timing signal indicating that the plate roll 3 is at a predetermined position (print reference position) is generated (step) S501). Details of the plate roll FB pulse and the print timing signal will be described later.

  The impression cylinder roll position / speed detector 41 of the impression cylinder roll control unit 40 receives the impression cylinder roll position FB from the impression cylinder roll encoder 8 and indicates the rotation position of the impression cylinder roll from the impression cylinder roll position FB. The impression cylinder roll FB pulse corresponding to the change in the numerical value of the roll position data, impression cylinder roll position FB, and impression cylinder roll speed FB indicating the degree of change in impression cylinder roll FB are generated (step S502). Details of the impression cylinder roll position data, impression cylinder roll FB pulse, and impression cylinder roll speed FB will be described later.

  The printing position phase adjuster 32 of the plate roll control unit 30 receives a printing timing signal from the plate roll position / speed detector 31, a mark signal from the mark sensor 5, and an impression cylinder roll position from the impression cylinder roll position / speed detector 41. Each of the data is input, and the pressure drum roll position data at the input timing of the mark signal is held in a FIFO (First In First Out) storage unit.

  The printing position phase adjuster 32 sets the impression cylinder roll position data to the printing position data B at the input timing of the printing timing signal, and reads the oldest impression cylinder roll position data from the FIFO storage unit to mark position Data A is set (step S503). Then, the print position phase adjuster 32 calculates the print interval length L from the mark position data A, the print position data B, etc. (step S504), and between the print interval length L and a preset print interval set value S. A corresponding reference pulse corresponding to the deviation is generated (step S505). Details of the oldest impression cylinder roll position data read from the storage unit of the FIFO and the reference pulse will be described later.

  If the mark signal from the mark sensor 5 is not input for a predetermined time, the printing position phase adjuster 32 determines that the mark has not been detected, and sets the printing interval set value S as the printing interval length L. A reference pulse corresponding to zero deviation is generated. As a result, the plate roll 3 rotates at the same constant speed as the impression cylinder roll 2.

  The printing position deviation detector 33 of the printing roll control unit 30 receives the printing roll FB pulse and printing timing signal from the printing roll position / speed detector 31, the reference pulse from the printing position phase adjuster 32, and the impression cylinder roll position / speed. The pressure drum roll FB pulse is input from the detector 41, and the set value of the counter is set from the reference pulse at the input timing of the print timing signal (step S506). The printing position deviation detector 33 generates, as a plate roll position error, a counter value that decreases from the set value to zero with the input of the plate roll FB pulse and the impression cylinder roll FB pulse that are feedback-controlled (step S507). .

  A plate roll speed command generator 34 of the plate roll control unit 30 inputs a plate roll position error from the printing position deviation detector 33 and also inputs an impression cylinder roll speed FB from the impression cylinder roll position / speed detector 41. A multiplication result obtained by multiplying a plate roll position error by a gain is added to the impression cylinder roll speed FB to generate a plate roll speed command, which is output to the plate roll inverter 12 after upper and lower limit and ramp processing (step S508). ). The impression cylinder roll speed command generator 42 of the impression cylinder roll control unit 40 generates an impression cylinder roll speed command having a preset constant speed, and outputs it to the impression cylinder roll inverter 9. Thereby, the impression drum roll 2 rotates at a constant speed. The plate roll speed command generator 34 of the plate roll control unit 30 is based on the impression roll speed FB with respect to the constant pressure drum roll speed command generated by the impression drum roll speed command generator 42, and is based on the plate roll speed command. Is output to the plate roll inverter 12. Thereby, the plate roll 3 rotates on the basis of a constant speed of the impression cylinder roll speed FB.

[Plate roll position / speed detector]
Next, the plate roll position / speed detector 31 of the plate roll control unit 30 provided in the controller 13 shown in FIG. 4 will be described. FIG. 6 is a block diagram showing the configuration of the plate roll position / speed detector 31. The plate roll position / speed detector 31 includes a speed converter 311, a pulse converter 312, a plate roll position detector 313, and a printing timing signal detector 314. As described above, the plate roll position / speed detector 31 generates a plate roll FB pulse corresponding to a change in the value of the plate roll position FB from the origin signal and the plate roll position FB, and the plate roll 3 is set to a predetermined position. A print timing signal indicating the presence is generated.

  The speed converter 311 of the plate roll position / speed detector 31 receives the plate roll position FB from the plate roll encoder 11 and inputs a preset speed conversion coefficient, and multiplies the plate roll position FB by the speed conversion coefficient. Then, the plate roll speed FB is generated and output.

  The pulse converter 312 receives the plate roll position FB from the plate roll encoder 11 and also inputs a preset pulse conversion coefficient, multiplies the plate roll position FB by the pulse conversion coefficient, and changes the numerical value of the multiplication result. A corresponding plate roll FB pulse is generated and output to the plate roll position detector 313 and the printing position deviation detector 33.

  Here, as the plate roll FB pulse, a large number of pulse signals are generated when the change in the numerical value of the multiplication result is large, and a small number of pulse signals are generated when the change in the numerical value of the multiplication result is small. That is, when the plate roll 3 rotates at a high speed, the numerical change of the plate roll position FB is large. Therefore, the unit time output by the pulse converter 312 or the number of plate roll FB pulses per scan is the plate roll. 3 is larger than when rotating at a low speed.

  The plate roll position detector 313 receives an origin signal from the origin sensor 6 and also receives a plate roll FB pulse from the pulse converter 312, and further inputs a preset origin correction value, and the origin signal input timing. The plate roll position data indicating the position of the plate is preset to the origin correction value and is output to the print timing signal detector 314 as plate roll position data. The plate roll position detector 313 adds a predetermined value to the plate roll position data each time a plate roll FB pulse is input, and outputs the resulting plate roll position data.

  For example, the plate roll position detector 313 outputs plate roll position data from −180 ° to + 180 °, for example, with respect to the origin of the plate roll 3 every time the plate roll 3 rotates once. Here, the origin correction value is data for correcting the plate roll position data that is preset by inputting the origin signal, and the position of the plate provided on the plate roll 3 is corrected. From the plate roll position data, the position of the plate provided on the plate roll 3, that is, the printing position is recognized.

  The print timing signal detector 314 receives the plate roll position data from the plate roll position detector 313 and also inputs a preset print timing position setting value (for example, 0 °), and the plate roll position data is the print timing position. At the set value, a print timing signal is generated and output to the print position phase adjuster 32 and the print position deviation detector 33.

  FIG. 7 is a diagram for explaining plate roll position data detected by the plate roll position detector 313 of the plate roll position / speed detector 31. FIG. 7 (1) shows the rotation of the plate roll 3 and the plate roll position. FIG. 7 (2) shows data roll position data and printing timing signals. As the plate roll 3, a roll having an appropriate roll diameter is selected from a plurality of roll diameters according to the size of the plate that supplies ink to the material 1. Further, the plates are attached at predetermined positions on the plate roll 3, and in the case of a plurality of plates, they are attached so as to be equally spaced. The predetermined position where the plate is pasted is a position corresponding to the origin detection piece of the plate roll 3 (the origin signal detection plate attached to the plate roll 3) detected as the origin signal by the origin sensor 6.

  Referring to FIG. 7 (1), two opposing plates 21-1 and 21-2 are attached to the plate roll 3, and the central portion α of the plate 21-1 is positioned at the top. 1, that is, when the central portion α of the plate 21-1 exists in a position closest to the impression drum roll 2 (position where the impression drum roll 2 and the plate roll 3 are inserted) in FIG. 1 and FIG. Plate roll position data for ° is generated. Further, when the central portion α of the plate 21-1 is located at the lowermost portion, plate roll position data of −180 ° or + 180 ° is generated. A preset origin correction value is input so that such plate roll position data is generated by the plate roll position detector 313.

  Referring to FIG. 7 (2), the plate roll position detector 313 inputs a plate roll FB pulse as the central position α of the plate 21-1 rotates counterclockwise from the uppermost part to the lowermost part. Plate roll position data that varies from to 180 degrees. Further, as the central portion α of the plate 21-1 rotates counterclockwise from the lowermost portion to the uppermost portion, a plate roll FB pulse is input to generate plate roll position data that changes from + 180 ° to 0 °. The plate roll position detector 313 sets the plate roll position data to the origin correction value every time the origin signal is input. Thereby, plate roll position data can be adjusted for every rotation of the plate roll 3, and highly accurate plate roll position data can be generated. The print timing signal detector 314 generates a print timing signal when the plate roll position data is 0 °. As a result, a printing timing signal is output from the plate roll position / speed detector 31 when the central portion α of the plate 21-1 exists at the top of the plate roll 3 and approaches the impression drum roll 2 most closely.

  In this way, the plate roll position / speed detector 31 generates the plate roll FB pulse corresponding to the change in the value of the plate roll position FB from the origin signal and the plate roll position FB, and the plate roll 3 is at a predetermined position. A print timing signal indicating this is generated.

[Impression roll position / speed detector]
Next, the impression roll position / speed detector 41 of the impression roll control unit 40 provided in the controller 13 shown in FIG. 4 will be described. FIG. 8 is a block diagram showing a configuration of the impression drum roll position / speed detector 41. The impression roll position / speed detector 41 includes a speed converter 411, a pulse converter 412, and an impression cylinder roll line counter 413. As described above, the impression cylinder roll position / speed detector 41 determines the impression cylinder roll position data indicating the rotation position of the impression cylinder roll from the impression cylinder roll position FB and the impression cylinder corresponding to the change in the numerical value of the impression cylinder roll position FB. A roll FB pulse and a pressure drum roll speed FB indicating the degree of change of the pressure drum roll FB are generated.

  The speed converter 411 of the impression cylinder roll position / speed detector 41 inputs the impression cylinder roll position FB from the impression cylinder roll encoder 8 and also inputs a preset speed conversion coefficient to the impression cylinder roll position FB. The impression coefficient roll speed FB is generated by multiplying the conversion coefficient and output to the plate roll speed command generator 34.

  The pulse converter 412 receives the impression cylinder roll position FB from the impression cylinder roll encoder 8, inputs a preset pulse conversion coefficient, multiplies the impression cylinder roll position FB by the pulse conversion coefficient, and obtains a numerical value of the multiplication result. A pressure drum roll FB pulse corresponding to the change in the pressure is generated and output to the pressure drum roll line counter 413 and the printing position deviation detector 33.

  Here, since the impression cylinder roll 2 is rotating at a constant speed and the impression cylinder roll position FB changes at a constant speed, the impression cylinder roll FB pulse is a constant number per unit time or one scan. Are generated.

  When comparing the impression roll FB pulse output from the pulse converter 412 with the plate roll FB pulse output from the pulse converter 312 shown in FIG. 6, the impression roll 2 and the plate roll 3 are the same. When rotating at a constant speed, the same number of impression cylinder roll FB pulses and plate roll FB pulses are output per unit time or per scan. When the plate roll 3 is rotating at a higher speed than the impression cylinder roll 2, a larger number of plate roll FB pulses than the impression cylinder roll FB pulses are output per unit time or one scan. When the plate roll 3 rotates at a lower speed than the impression cylinder roll 2, a smaller number of plate roll FB pulses than the impression cylinder roll FB pulses are output per unit time or one scan.

  The impression cylinder roll line counter 413 inputs the impression cylinder roll FB pulse, and counts from zero to a preset upper limit every time the impression cylinder roll FB pulse is inputted, and resets when the upper limit value is reached. A count value that becomes zero is generated, and the counter value is output to the printing position phase adjuster 32 as impression cylinder roll position data. The impression cylinder roll line counter 413 is a free-run counter that counts impression cylinder roll FB pulses.

  Thus, the impression cylinder roll position / speed detector 41 changes the impression cylinder roll position data indicating the rotation position of the impression cylinder roll from the impression cylinder roll position FB, and the impression cylinder corresponding to the change in the numerical value of the impression cylinder roll position FB. An impression cylinder roll speed FB indicating the degree of change of the roll FB pulse and impression cylinder roll FB is generated.

[Print position phase adjuster: Configuration]
Next, the printing position phase adjuster 32 of the plate roll control unit 30 provided in the controller 13 shown in FIG. 4 will be described. FIG. 9 is a block diagram showing a configuration of the printing position phase adjuster 32. The print position phase adjuster 32 includes a print position data holder 321, a mark position data holder 322, a print interval length calculator 323, a pulse converter 324, and a reference pulse calculator 325. As described above, the print position phase adjuster 32 sets the mark position data A and the print position data B from the mark signal, the print timing signal, and the impression cylinder roll position data, calculates the print interval length L, and prints the print interval length L. And a reference pulse corresponding to a deviation between the print interval setting value S and the print interval setting value S.

  A printing position data holder 321 of the printing position phase adjuster 32 inputs a printing timing signal from the plate roll position / speed detector 31 and inputs impression cylinder roll position data from the impression cylinder roll position / speed detector 41. Further, a read command is input from the print interval length calculator 323. The printing position data holder 321 writes the inputted impression cylinder roll position data in the storage unit at the input timing of the printing timing signal, and the impression cylinder roll position data written in the storage unit at the input timing of the read command. Read, set to print position data B, and output to print interval length calculator 323. At this time, the read impression cylinder roll position data is deleted from the storage unit.

  The mark position data holder 322 receives a mark signal from the mark sensor 5, inputs impression cylinder roll position data from the impression cylinder roll position / speed detector 41, and further issues a read command from the printing interval length calculator 323. input. The mark position data holder 322 sequentially writes the inputted impression cylinder roll position data to the FIFO storage unit at the input timing of the mark signal, and the oldest data written to the FIFO storage unit at the input timing of the read command. The pressure drum roll position data is read out, set as mark position data A, and output to the printing interval length calculator 323. At this time, the oldest impression cylinder roll position data read out is deleted from the storage unit of the FIFO. The mark position data holder 322 may be masked so that a new mark signal is not input during a preset mask time after inputting the mark signal from the mark sensor 5. Thereby, the erroneous detection of the mark by the mark sensor 5 can be eliminated.

The print interval length calculator 323 receives a print timing signal from the plate roll position / speed detector 31 and outputs a read command to the print position data holder 321 and the mark position data holder 322 at the input timing. The print position data B is input from the print position data holder 321 and the mark position data A is input from the mark position data holder 322. Then, the print interval length calculator 323 calculates the next print interval length L according to the following equation (1) and outputs it to the pulse converter 324.
L = (X + Y) − (BA) (1)
Here, X is a sensor distance setting value that is a mark sensor distance, that is, a distance from the installation position of the mark sensor 5 to the insertion position (printing position) of the impression cylinder roll 2 and the plate roll 3 in the material 1. (See FIG. 2). Y is the sensor distance correction value, that is, the state shown in FIG. 3C or FIG. It is a correction value for doing so. That is, when a quantitative shift occurs when printing at a predetermined location based on the mark, the user can eliminate the quantitative shift by changing the sensor distance correction value Y.

  The print position data B is impression cylinder roll position data written in the storage unit by the print position data holder 321 at the input timing of the print timing signal, and is read out by a read command immediately after being written in the storage unit. The mark position data A is the impression cylinder roll position data written in the FIFO storage unit by the mark position data holder 322 at the input timing of the mark signal, and is the oldest impression cylinder roll written in the FIFO storage unit. The position data is read as a mark position data A by a read command.

  Here, in the FIFO memory of the mark position data holder 322, the pressure drum roll position data at the detection timing is sequentially written for each mark signal of the mark which is the printing reference in the material 1. The oldest impression cylinder roll position data read out from the FIFO storage unit and output to the printing interval length calculator 323 as the mark position data A is a mark signal of a mark serving as a reference for the next printing. Is an impression cylinder roll position data corresponding to. Accordingly, the print interval length L calculated by the print interval length calculator 323 is the distance between the position on the material 1 to be printed this time and the position on the material 1 to be printed next time.

  The print interval length calculator 323 sets the longest value as the print interval length L when the print interval length L calculated by the equation (1) is larger than the preset longest value. Further, when the printing interval length L calculated by the equation (1) is smaller than a preset shortest value, the shortest value is set as the printing interval length L.

  The pulse converter 324 receives the print interval length L from the print interval length calculator 323, inputs a preset pulse conversion coefficient, multiplies the print interval length L by the pulse conversion coefficient, A printing interval length pulse corresponding to the size is generated and output to the reference pulse calculator 325. Here, as the printing interval length pulse, a number of pulse signals proportional to the value of the multiplication result are generated and output.

  The reference pulse calculator 325 inputs a print interval length pulse, which is a pulse signal of a number corresponding to the numerical value of the print interval length L, from the pulse converter 324, and also inputs a preset print interval set value pulse, The number of printing interval set value pulses is subtracted from the number of printing interval length pulses, a reference pulse that is a pulse signal of the number of subtraction results is generated, and is output to the printing position deviation detector 33.

  Here, the print interval set value pulse is a number of pulse signals corresponding to the print interval set value S. The print interval set value pulse and the print interval length pulse generated by the pulse converter 324 are both constituted by a number of pulse signals corresponding to the distance between the print interval set value S and the print interval length L. When the print interval set value S and the print interval length L are the same, the print interval set value pulse and the print interval length pulse have the same number of pulse signals. When the print interval length L is smaller than the print interval set value S, the print interval length pulse has a smaller number of pulse signals than the print interval set value pulse, and the print interval length L is larger than the print interval set value S. In this case, the print interval length pulse has a larger number of pulse signals than the print interval set value pulse.

The print interval setting value S is calculated by the following equation (2) and set in advance.
S = π × (D + 2 × T) / M (2)
Here, D represents the diameter of the plate roll 3, T represents the thickness of the plates 21-1 and 21-2 attached to the plate roll 3, and M represents the plate attached to the plate roll 3. The number of 21-1, 21-2 is shown. In the case of FIG. 7 (1), M = 2. That is, the print interval setting value S set by the equation (2) is the outer peripheral distance corresponding to one plate among the outer peripheral distances of the plate roll 3 including the thicknesses of the plates 21-1 and 21-2. . When the circumference of the plate roll 3 corresponds to the mark interval, M = 1 regardless of the number of plates 21-1 and 21-2. In this case, the printing interval set value S is the distance of the outer periphery of the plate roll 3 including the thicknesses of the plates 21-1 and 21-2.

[Print position phase adjuster: Processing]
Next, processing of the printing position phase adjuster 32 shown in FIG. 9 will be described. FIG. 10 is a flowchart showing the processing of the printing position phase adjuster 32. First, the mark position data holder 322 of the printing position phase adjuster 32 determines whether or not a mark signal has been input (step S1001). If it is determined that a mark signal has been input (step S1001: Y), The pressure drum roll position data input at this time is written in the FIFO storage unit (step S1002), the process is terminated, and step S1001 is executed. In this way, the impression cylinder roll position data is sequentially written in the FIFO storage section of the mark position data holder 322 at every input timing of the mark signal. On the other hand, when the mark position data holder 322 determines that the mark signal is not input (step S1001: N), the mark position data holder 322 proceeds to step S1003.

  Shifting from step S1001, the print position data holder 321 and the print interval length calculator 323 determine whether or not a print timing signal has been input (step S1003). If it is determined in step S1003 that a printing timing signal has been input (step S1003: Y), the printing position data holder 321 writes the impression cylinder roll position data input at that time in the storage unit, and print interval length calculator In response to the read command from H.323, the impression cylinder roll position data is read from the storage unit and set in the print position data B (step S1004). When the print interval length calculator 323 determines in step S1003 that a print timing signal has been input (step S1003: Y), the print interval length calculator 323 outputs a read command to the print position data holder 321 and prints corresponding to the read command. The position data B is input and a read command is output to the mark position data holder 322. In response to the read command from the print interval length calculator 323, the mark position data holder 322 reads the oldest impression cylinder roll position data written in the FIFO storage unit and sets it as the mark position data A (step In step S1005, the read impression cylinder roll position data is deleted from the FIFO storage unit (step S1006). The mark position data holder 322 sets null data as the mark position data A when the impression cylinder roll position data is not written in the storage unit of the FIFO. The print interval length calculator 323 receives the mark position data A corresponding to the read command from the mark position data holder 322.

  When the print position data B and the mark position data A are input at the print timing, the print interval length calculator 323 determines whether or not the mark position data A exists (step S1007). When it is determined in step S1007 that the mark position data A does not exist, that is, the mark position data A is null data (step S1007: N), the print interval length calculator 323 sets the print interval length L to the print interval length L. A value S is set (step S1008). On the other hand, if the print interval length calculator 323 determines in step S1007 that the mark position data A exists, that is, the mark position data A is not null data (step S1007: Y), The printing interval length L is calculated (step S1009). It is assumed that the mark sensor distance X and the sensor distance correction value Y are set in advance.

  Shifting from step S1008 or step S1009, the reference pulse calculator 325 determines the number of pulse signals in the print interval length pulse corresponding to the print interval length L and the number of pulse signals in the preset print interval set value pulse. Is generated as a reference pulse, that is, a reference pulse having a number of pulse signals corresponding to a deviation between the printing interval length L and the printing interval setting value S is generated, and the printing position deviation detector 33 is Output (step S1010).

  As described above, the print position phase adjuster 32 sets the mark position data A and the print position data B from the mark signal, the print timing signal, and the impression roll position data, calculates the print interval length L, and calculates the print interval length L. And a reference pulse corresponding to a deviation between the print interval setting value S is generated. Thereby, the phase shift of the impression cylinder roll 2 and the plate roll 3 indicating the deviation between the printing interval length L and the printing interval setting value S can be obtained in advance as the reference pulse before the next printing. Therefore, the printing position deviation detector 33 and the plate roll speed command generator 34 at the subsequent stage perform processing for eliminating the phase shift between the impression cylinder roll 2 and the plate roll 3 to match the phases and correct the print position shift. be able to.

(Calculation example of print interval length L)
Next, a calculation example of the print interval length L by the print interval length calculator 323 of the print position phase adjuster 32 shown in FIG. 9 will be described. FIG. 11 is a diagram for explaining an arithmetic expression (the expression (1)) of the printing interval length L. Marks m1 to m4 detected by the mark sensor 5 are printed on the material 1, and a printing interval length calculator 323 of the printing position phase adjuster 32 is provided on the plate 21-1 provided on the plate roll 3. When the central location α is positioned at the top, that is, at the input timing of the print timing signal, the print interval length L is calculated by the above equation (1). The printing interval length L is calculated by (X + Y) − (BA) = Z− (BA). Z is the corrected mark sensor distance, and Z = X + Y.

  Here, (B-A) is the position of the impression cylinder roll at the input timing (the state shown in FIG. 11) of the printing timing signal in which the central portion α of the plate 21-1 provided on the plate roll 3 is located at the top. From the printing position data B which is data, the mark m2 on the material 1 is past input timing of the mark signal detected by the mark sensor 5 (in FIG. 11, when the mark m2 passes the vicinity of the mark sensor 5 The result of subtracting the mark position data A which is the impression cylinder roll position data in the past state detected by the sensor 5 is shown. Therefore, (B-A) shows the distance that the mark m2 has advanced from the position of the mark sensor 5 to the position shown in FIG. That is, the printing interval length L, which is the calculation result of (X + Y) − (B−A), is the position of the mark m2 in the state shown in FIG. 11 and the insertion of the impression cylinder roll 2 and the plate roll 3 where printing is performed. In other words, the distance between the position where the current printing is performed with reference to the mark 1 and the position where the next printing is performed with the mark m2 as a reference. In this case, if the printing interval length L as the calculation result is the same as the printing interval setting value S, the rotation speed of the plate roll 3 is set to the rotation speed of the impression cylinder roll 2 (traveling speed of the material 1), which is a constant speed. By matching, the mark m2 in the state shown in FIG. 11 arrives at the insertion position of the impression cylinder roll 2 and the plate roll 3 as the material 1 travels, and is inserted in the state shown in FIG. The central position α of the plate 21-1 existing at the position makes one rotation and coincides with the timing of arrival at the same insertion position. The printing position phase adjuster 32 is a reference for accelerating and decelerating the plate roll 3 and rotating it at the same constant speed as the rotation speed of the impression cylinder roll 2 (material traveling speed) for the purpose of matching these timings. Generate a pulse.

  FIG. 12 is a diagram for explaining the calculation timing of the print interval length L by the print interval length calculator 323 of the print position phase adjuster 32, and FIG. 13 is a continuation of FIG. FIG. 14 is a diagram for explaining the calculation process.

  FIG. 12 (1) shows the state of the mark signal input timing by the mark m1 when the mark m1 on the material 1 is detected by the mark sensor 5 at time t1. In this state, the pressure drum roll position data A1 at this time is written in the FIFO storage section of the mark position data holder 322.

  FIG. 12 (2) shows the state of the input timing of the print timing signal in which the plate roll 3 rotates at the time t2 after the time t1 and the central portion α is present at the insertion position (uppermost portion). In this state, the pressure drum roll position data B1 at this time is written in the storage unit provided in the printing position data holder 321. As shown in FIG. 14, at time t <b> 2, the impression cylinder roll position data of the mark serving as a reference for the next printing is not written in the FIFO storage unit provided in the mark position data holder 322. That is, the pressure drum roll position data at the input timing of the corresponding mark signal is not written. This is because the mark sensor 5 cannot detect the mark because there is no mark on the material 1. Therefore, the print interval length calculator 323 receives the print position data B1 from the print position data holder 321 and the null mark position data A from the mark position data holder 322 at the input timing of the print timing signal. The print interval set length S is set to the print interval length L without performing the calculation of the expression (1), and is output. Thereby, the plate roll 3 rotates at the same constant speed as the impression cylinder roll 2 until the next printing.

  FIG. 12 (3) shows the state of the input timing of the mark signal by the mark m2 when the mark m2 on the material 1 is detected by the mark sensor 5 at time t3 after time t2. In this state, the pressure drum roll position data A2 at this time is written in the FIFO storage section of the mark position data holder 322. In the storage unit of the FIFO, impression cylinder roll position data A1 and A2 of the marks m1 and m2 exist.

  FIG. 12 (4) shows the state of the input timing of the print timing signal in which the plate roll 3 rotates and the central location α exists at the insertion position (uppermost portion) at time t4 after time t3. In this state, the pressure drum roll position data B2 at this time is written in the storage unit provided in the printing position data holder 321. As shown in FIG. 14, at time t4, the pressure drum roll position data at the input timing of the corresponding mark signal is not written in the FIFO storage unit provided in the mark position data holder 322. This is because the mark sensor 5 cannot detect the mark because there is no mark on the material 1. Accordingly, the print interval length calculator 323 receives the print position data B2 from the print position data holder 321 and the null mark position data A from the mark position data holder 322 at the input timing of the print timing signal. The print interval set length S is set to the print interval length L without performing the calculation of the expression (1), and is output. Thereby, the plate roll 3 rotates at the same constant speed as the impression cylinder roll 2 until the next printing.

  FIG. 13 (5) shows the state of the input timing of the mark signal by the mark m3 when the mark m3 on the material 1 is detected by the mark sensor 5 at time t5 after time t4. In this state, the pressure drum roll position data A3 at this time is written in the FIFO storage section provided in the mark position data holder 322. In the storage unit of the FIFO, impression cylinder roll position data A1, A2, and A3 of the marks m1, m2, and m3 exist.

  FIG. 13 (6) shows the state of the input timing of the print timing signal in which the plate roll 3 rotates and the central position α exists at the insertion position (uppermost portion) at time t6 after time t5. In this state, the impression cylinder roll position data B3 at this time is written in the storage unit provided in the printing position data holder 321. As shown in FIG. 14, at time t6, the storage section of the FIFO provided in the mark position data holder 322 stores the impression cylinder roll position data A1 of the mark m1 serving as a reference for the next printing, that is, the corresponding mark signal. Is the impression cylinder roll position data A1 (impression cylinder roll position data A1 of the mark m1 which is a reference for the next printing). Therefore, the print interval length calculator 323 receives the print position data B3 from the print position data holder 321 at the input timing of the print timing signal, and the mark position data A1 (FIFO storage unit) from the mark position data holder 322. The oldest mark position data A1) written in is input, L = Z− (B3−A1) is calculated by the equation (1), and the print interval length L is output. Thus, the plate roll 3 is accelerated or decelerated according to the deviation between the printing interval length L and the printing interval setting value S until the next printing, and then rotates at the same constant speed as the impression cylinder roll 2. . In addition, after the mark position data A1 is read, the pressure drum roll position data A2 and A3 of the marks m2 and m3 exist in the storage unit of the FIFO provided in the mark position data holder 322.

  FIG. 13 (7) shows the state of the mark signal input timing by the mark m4 when the mark m4 on the material 1 is detected by the mark sensor 5 at time t7 after time t6. In this state, the pressure drum roll position data A4 at this time is written in the FIFO storage section provided in the mark position data holder 322. In the FIFO storage unit, impression cylinder roll position data A2, A3, and A4 of the marks m2, m3, and m4 exist.

  FIG. 13 (8) shows the state of the input timing of the print timing signal in which the plate roll 3 is rotated and the central position α is at the insertion position (uppermost portion) at time t8 after time t7. In this state, the pressure drum roll position data B4 at this time is written in the storage unit provided in the printing position data holder 321. As shown in FIG. 14, at time t8, the storage section of the FIFO provided in the mark position data holder 322 stores the impression cylinder roll position data A2 (the mark used as a reference for the next printing) at the input timing of the corresponding mark signal. There is m2 impression cylinder roll position data A2). Accordingly, the print interval length calculator 323 receives the print position data B4 from the print position data holder 321 at the input timing of the print timing signal, and the mark position data A2 (FIFO storage unit) from the mark position data holder 322. The oldest mark position data A2) written in is input, L = Z− (B4−A2) is calculated by the equation (1), and the print interval length L is output. Thus, the plate roll 3 is accelerated or decelerated according to the deviation between the printing interval length L and the printing interval setting value S until the next printing, and then rotates at the same constant speed as the impression cylinder roll 2. . In addition, after the mark position data A2 is read out, the impression cylinder roll position data A3 and A4 of the marks m3 and m4 exist in the FIFO storage unit provided in the mark position data holder 322.

  In this way, the print position data B is input from the print position data holder 321 by the print interval length calculator 323 at the input timing of the print timing signal, and the oldest data is stored from the FIFO storage unit of the mark position data holder 322. Mark position data A is input, and the print interval length L is calculated using the equation (1). Further, when the input mark position data A is null data, that is, the impression cylinder roll position data of the mark serving as a reference for the next printing is not written in the FIFO storage unit of the mark position data holder 322. In this case, the print interval setting value S is set to the print interval length L. In this case, a plate roll speed command for rotating the plate roll 3 by a printing position deviation detector 33 and a plate roll speed command generator 34, which will be described later, is the same constant speed as the impression cylinder roll 2, and the plate roll 3 and the pressure roll The body roll 2 rotates at a constant speed.

[Print position deviation detector]
Next, the printing position deviation detector 33 of the plate roll control unit 30 provided in the controller 13 shown in FIG. 4 will be described. FIG. 15 is a block diagram illustrating a configuration of the printing position deviation detector 33, and FIG. 16 is a flowchart illustrating processing of the printing position deviation detector 33. The print position deviation detector 33 includes a setter 331 and a deviation counter 332. As described above, the printing position deviation detector 33 sets the set value of the counter based on the reference pulse at the input timing of the printing timing signal, and inputs the plate roll FB pulse and the impression cylinder roll FB pulse subjected to feedback control. Accordingly, a counter value that decreases from the set value to zero is generated as a plate roll position error.

  The setting device 331 of the printing position deviation detector 33 determines whether or not a printing timing signal is input from the plate roll position / speed detector 31 (step S1601), and determines that a printing timing signal is input (step S1601). S1601: Y), a reference pulse having a number of pulse signals corresponding to the deviation between the print interval length L and the print interval set value S is input from the print position phase adjuster 32. Then, the setting device 331 obtains a reference setting value corresponding to the deviation between the printing interval length L and the printing interval setting value S based on the number of pulse signals in the reference pulse (step S1602), and sets the deviation counter 332 to the deviation counter 332. Output. On the other hand, if it is determined in step S1601 that the print timing signal has not been input (step S1601: N), the setting device 331 ends the process, executes step S1601, and waits for the input of the print timing signal.

  The deviation counter 332 receives the reference set value from the setting device 331, receives the plate roll FB pulse from the plate roll position / speed detector 31, and receives the impression roll FB pulse from the impression roller position / speed detector 41, respectively. To do. Here, the reference set value is a value corresponding to the deviation between the print interval length L and the print interval set value S, and the plate roll FB pulse is a numerical value of the plate roll position FB accompanying the rotation of the plate roll 3. The impression cylinder roll FB pulse is constituted by a pulse signal corresponding to a change in the numerical value of the impression cylinder roll position FB accompanying the rotation of the impression cylinder roll 2. Since the impression cylinder roll 2 rotates at a constant speed, the numerical value of the impression cylinder roll position FB increases at a constant speed, and the impression cylinder roll FB pulse becomes a regular pulse signal at regular intervals. Further, the plate roll 3 may rotate at the same constant speed as the impression cylinder roll 2 or may accelerate or decelerate. Therefore, when the plate roll 3 rotates at the same constant speed as the impression cylinder roll 2, the numerical value of the plate roll position FB increases at a constant speed, and the plate roll FB pulse is periodically repeated at the same regular intervals as the impression cylinder roll FB pulse. Pulse signal. Further, when the plate roll 3 accelerates and rotates at a higher speed than the impression drum roll 2, the value of the plate roll position FB increases rapidly, so that the plate roll FB pulse has a shorter interval than the impression drum roll FB pulse. It becomes a pulse signal. Further, when the plate roll 3 decelerates and rotates at a lower speed than the impression cylinder roll 2, the value of the plate roll position FB decreases rapidly, and the plate roll FB pulse is a pulse having a longer interval than the impression cylinder roll FB pulse. Signal.

  The deviation counter 332 sets the input reference set value to the set value of the counter (step S1603), and the number of plate roll FB pulses input under feedback control and the number of impression cylinder roll FB pulses input at regular intervals, Is subtracted from the set value, and the subtraction result is generated as a counter value (step S1604). The counter value decreases every time a plate roll FB pulse is input, and increases every time an impression cylinder roll FB pulse is input. The reason why the plate roll FB pulse is feedback-controlled is that the input interval of the plate roll FB pulse depends on the plate roll speed command generated according to the value of the plate roll position error which is the counter value of the deviation counter 332. It is. The deviation counter 332 outputs the counter value as a plate roll position error to the plate roll speed command generator 34 (step S1605).

  FIG. 17 is a diagram illustrating a timing chart of a printing timing signal, a plate roll position error, and the like. As shown in FIG. 17, at the input timing of the print timing signal, a reference set value is obtained based on a reference pulse corresponding to a deviation between the print interval length L and the print interval set value S. This reference set value Is set to the set value of the deviation counter 332. The reference set value increases in proportion to the deviation between the print interval length L and the print interval set value S. The plate roll position error, which is the counter value of the deviation counter 332, is added by the input of the impression drum roll FB pulse at regular intervals, and is subtracted by the input of the fed plate roll FB pulse. The plate roll speed command is controlled by the printing position deviation detector 33 and the plate roll speed command generator 34 so that the plate roll position error of the deviation counter 332 becomes zero. As shown in FIG. Under the upper / lower limit limitation and the ramp processing limitation by the speed command generator 34, the acceleration is accelerated to a constant speed and decelerated to return to the original constant speed (the same constant speed as the impression cylinder roll 2). Thus, the plate roll position error decreases toward zero and becomes zero. Here, the constant speed of the plate roll speed command is clamped by the upper / lower limiter 345 of the plate roll speed command generator 34, and the amount of change in acceleration and deceleration of the plate roll speed command is determined by the plate roll speed command generator 34. Limited by ramp 346.

  Thus, the set value of the counter is set by the print position deviation detector 33 based on the reference pulse corresponding to the deviation between the print interval length L and the print interval set value S at the input timing of the print timing signal. In response to the input of the plate roll FB pulse and the impression cylinder roll FB pulse that are feedback-controlled, a counter value that decreases from the set value to zero is generated as a plate roll position error. As a result, the phase shift between the impression cylinder roll 2 and the plate roll 3 indicating the deviation between the printing interval length L and the printing interval set value S is set to the set value of the counter, and the plate roll position error that is the counter value is set. The plate roll speed command generator 34, which will be described later, generates a plate roll speed command so that becomes zero.

[Plate roll speed command generator]
Next, the plate roll speed command generator 34 of the plate roll control unit 30 provided in the controller 13 shown in FIG. 4 will be described. FIG. 18 is a block diagram showing the configuration of the plate roll speed command generator 34, and FIG. 19 is a flowchart showing the processing of the plate roll speed command generator 34. The plate roll speed command generator 34 includes multipliers 341, 343, 344, an adder 342, an upper / lower limiter 345, and a ramp unit 346. As described above, the plate roll speed command generator 34 adds the multiplication result obtained by multiplying the plate roll position error by the gain to the impression cylinder roll speed FB, generates the addition result as a plate roll speed command, and limits the upper and lower limits. And ramp processing.

  A multiplier 341 of the plate roll speed command generator 34 inputs a plate roll position error from the printing position deviation detector 33, inputs a preset position gain, and multiplies the plate roll position error by the position gain. A position error speed is generated, and the position error speed is output to the adder 342 (step S1901). The position error speed is a speed for correcting a synchronization shift between the impression cylinder roll 2 and the plate roll 3 at the current time so that printing is performed at a predetermined position on the material 1 by the plate roll 3.

  The adder 342 receives the impression cylinder roll speed FB from the impression cylinder roll position / speed detector 41, and also receives the position error speed from the multiplier 341, and adds the position error speed to the impression cylinder roll speed FB to increase the speed. A command is generated and the speed command is output to the upper / lower limiter 345 (step S1902).

  The multiplier 343 inputs the impression cylinder roll speed FB from the impression cylinder roll position / speed detector 41, inputs a preset maximum speed change rate, and multiplies the impression cylinder roll speed FB by the maximum speed change rate. The upper limit value is generated, and the upper limit value is output to the upper / lower limiter 345. The multiplier 344 inputs the impression cylinder roll speed FB from the impression cylinder roll position / speed detector 41 and also inputs a preset minimum speed change rate, and sets the minimum speed change rate to the impression cylinder roll speed FB. The lower limit value is generated by multiplication, and the lower limit value is output to the upper / lower limiter 345. The upper and lower limit limiter 345 inputs the speed command from the adder 342, receives the upper limit value from the multiplier 343, and the lower limit value from the multiplier 344, and limits the upper and lower limits of the speed command (step S1903). ) If the speed command is greater than or equal to the upper limit value, the upper limit value is set to the speed command. If the speed command is less than or equal to the lower limit value, the lower limit value is set to the speed command. Output.

  The ramp unit 346 receives a speed command from the upper / lower limiter 345, and performs a ramp process (for example, a filter process having a first-order lag characteristic) on the input speed command so that the speed command is received at a predetermined time. The speed is delayed by a constant (step S1904), and the speed command after the ramp processing is output to the plate roll inverter 12 as a plate roll speed command (step S1905).

  Referring to the plate roll speed command shown in FIG. 17, the plate roll speed command is a command obtained by adding the multiplication result of the plate roll position error to this value on the basis of the impression drum roll speed FB. The plate roll speed command is limited by the ramp process of the ramp unit 346, and when the plate roll speed command reaches the upper limit value, the upper limit value is set by the upper limit check of the upper and lower limit limiter 345. maintain. Then, as the plate roll position error becomes smaller, the plate roll speed command becomes lower than the upper limit value, and the falling deceleration is limited by the ramp process of the ramp unit 346.

  In this way, the plate roll speed command generator 34 uses the impression cylinder roll speed FB as a reference, and a multiplication result obtained by multiplying the plate roll position error by the gain is added to this value, and the addition result is used as a plate roll speed command. Are generated, and upper and lower limits and ramp processing are performed. Thereby, the plate roll speed command becomes a value corresponding to the size of the plate roll position error with reference to the impression cylinder roll speed FB. The plate roll speed command approaches the value of the impression cylinder roll speed FB as the plate roll position error approaches zero, and when the plate roll position error becomes zero because the phase shift of the impression cylinder roll 2 and the plate roll 3 disappears, The value of the impression cylinder roll speed FB, that is, the same constant speed as the impression cylinder roll 2 is obtained. That is, since the plate roll 3 rotates synchronously with the same constant speed as the impression drum roll 2, the phases of the impression drum roll 2 and the plate roll 3 can be matched.

  As described above, according to the controller 13 which is a printing apparatus according to the embodiment of the present invention, the print position phase adjuster 32 performs the mark position data A and the print position data from the mark signal, the print timing signal, and the impression cylinder roll position data. B is set, the print interval length L is calculated, and a reference pulse corresponding to the deviation between the print interval length L and the print interval set value S is generated. Further, the printing position deviation detector 33 sets a counter setting value based on the reference pulse at the input timing of the printing timing signal, and is accompanied by the input of the plate roll FB pulse and the impression cylinder roll FB pulse subjected to feedback control. A counter value that decreases from the set value to zero is generated as a plate roll position error. The plate roll speed command generator 34 adds the multiplication result obtained by multiplying the plate roll position error by the gain to the impression cylinder roll speed FB, and generates the addition result as a plate roll speed command. After the processing, the plate roll 3 was rotated by a plate roll speed command. As a result, the plate roll position error approaches zero and becomes zero, and the plate roll speed command becomes the value of the impression cylinder roll speed FB, that is, the same constant speed as the impression cylinder roll 2. That is, since the plate roll 3 rotates synchronously at the same constant speed as the impression cylinder roll 2, the phases of the impression cylinder roll 2 and the plate roll 3 can be matched. Correction can be performed. In other words, the printing reference position on the material 1 based on the mark signal and the printing reference position on the plate roll 3 based on the printing timing signal can be matched, and registration can be performed reliably.

  Further, in a plurality of printing machines that perform multicolor printing, the impression cylinder roll motor 7 and the impression cylinder roll encoder 8 are provided for each printing machine. Therefore, it is necessary to use one large-capacity motor connected by a line shaft. Absent. Therefore, the capacity of the impression cylinder roll motor 7 and the impression cylinder roll encoder 8 can be made smaller than that of the conventional motor. In addition, since it is not necessary to use an expensive misregistration detection device, the misregistration of the printing position can be corrected with an inexpensive configuration.

DESCRIPTION OF SYMBOLS 1 Material 2 Pressure drum roll 3 Plate roll 4 Anilox roll 5 Mark sensor 6 Origin sensor 7 Pressure drum roll motor 8 Pressure drum roll encoder 9 Pressure drum roll inverter 10 Plate roll motor 11 Plate roll encoder 12 Plate roll inverter 13 Printing device (controller )
20 Printing Machine 21 Plate 30 Plate Roll Control Unit 31 Plate Roll Position / Speed Detector 32 Print Position Phase Adjuster 33 Print Position Deviation Detector 34 Plate Roll Speed Command Generator 40 Impression Roll Control Unit 41 Impression Roll Position / Speed Detector 42 Impression roll speed command generator 311, 411 Speed converter 312, 412 Pulse converter 313 Plate roll position detector 314 Print timing signal detector 321 Print position data holder 322 Mark position data holder 323 Print interval length Calculator 324 Pulse converter 325 Reference pulse calculator 331 Setter 332 Deviation counters 341, 343, 344 Multiplier 342 Adder 345 Upper / lower limiter 346 Ramp unit 413 Pressure drum roll line counter

Claims (7)

By rotating the impression cylinder roll, the marked material is caused to travel at predetermined intervals, and the plate roll provided with the plate is rotated so that the material is inserted between the impression cylinder roll and the plate roll. Thus, in a printing apparatus that sequentially performs printing with the plate at a predetermined position of the material based on the mark,
Generating a pressure drum roll speed command at a constant speed set in advance, and a pressure drum roll speed command generator for rotating the pressure drum roll;
An impression cylinder roll position / speed detector for detecting impression cylinder roll position data indicating a rotation position of the impression cylinder roll, and an impression cylinder roll speed feedback indicating a rotation speed of the impression cylinder roll;
A print timing signal detector that receives an origin signal indicating that the origin detection piece has been detected from a detector that detects the origin detection piece provided on the plate roll, and detects a print timing signal based on the origin signal. When,
A mark signal indicating that the mark has been detected is input from a detector that detects the mark, and impression cylinder roll position data detected by the impression cylinder roll position / speed detector at the input timing of the mark signal, and The printing interval length on the material is calculated based on the impression cylinder roll position data detected by the impression cylinder roll position / speed detector at the detection timing of the printing timing signal, and the printing interval length is set in advance. A printing position at which the deviation between the set printing interval is determined, the deviation is set as a printing position deviation, and the printing position deviation is reduced to zero with the rotation of the plate roll and the impression cylinder roll. A deviation generator;
A plate roll speed command including the printing position deviation is generated on the basis of the value of the pressure drum roll speed feedback detected by the pressure drum roll position / speed detector, and the plate roll is rotated by the plate roll speed command. A plate roll speed command generator for accelerating or decelerating the plate roll based on the printing position deviation,
A printing apparatus comprising: The printing apparatus according to claim 1,
The printing position deviation generator is
The deviation between the calculated printing interval length and the preset printing interval setting value is set to the counter setting value that approaches zero as the plate roll rotates and the impression cylinder roll rotates. The printing apparatus is characterized in that the counter value is generated as a printing position deviation. The printing apparatus according to claim 1 or 2,
The plate roll speed command generator is
The printing position deviation generated by the printing position deviation generator is multiplied by a predetermined value, the multiplication result is added to the value of the impression cylinder roll speed feedback detected by the impression cylinder roll position / speed detector, and the addition result A printing apparatus characterized by generating a plate roll speed command based on the above and rotating the plate roll. The printing apparatus according to any one of claims 1 to 3,
The printing position deviation generator is
A mark position holder that writes pressure drum roll position data detected by the pressure drum roll position / speed detector to a storage unit each time the mark signal is input;
The impression cylinder roll position data detected by the impression cylinder roll position / speed detector at the detection timing of the printing timing signal is used as the printing position data, and corresponds to the mark signal of the mark serving as a reference for the next printing. The impression roll position data is read from the mark position holder and used as mark position data, and the printing position and the mark where the material is inserted between the impression cylinder roll and the plate roll and printing is detected are detected. A printing interval length calculator for calculating a printing interval length based on the distance between the detector installation position and the set printing position data and mark position data;
A printing apparatus comprising: The printing apparatus according to claim 4,
The printing interval length calculator of the printing position deviation generator is:
When impression cylinder roll position data corresponding to a mark signal of a mark serving as a reference for the next printing is not written in the mark position holder, a preset print interval setting value is set as the print interval length. A printing apparatus characterized by that. The printing apparatus according to claim 4,
The printing interval length calculator of the printing position deviation generator is:
The distance between the printing position where the material is inserted between the impression cylinder roll and the plate roll and printing is performed, and the position where the detector for detecting the mark is installed, correction for correcting the distance A printing apparatus, wherein a printing interval length is calculated based on a value, the set printing position data, and mark position data. By rotating the impression cylinder roll at a constant speed, the marked material is run at a predetermined interval, and the plate roll provided with the plate is rotated, and the plate roll provided between the impression cylinder roll and the plate roll In a printing method in which printing is sequentially performed by the plate at a predetermined position of the material based on the mark by inserting the material,
Detecting impression cylinder roll position data indicating the rotation position of the impression cylinder roll, and impression cylinder roll speed feedback indicating the rotation speed of the impression cylinder roll;
An origin signal indicating that the origin detection piece is detected is input from a detector that detects the origin detection piece provided on the plate roll, and a print timing signal is detected based on the origin signal;
A mark signal indicating that the mark has been detected is input from a detector that detects the mark, and is detected at the detection timing of the impression cylinder roll position data detected at the input timing of the mark signal and the print timing signal. Calculating a printing interval length on the material based on impression cylinder roll position data;
A deviation between the printing interval length and a preset printing interval setting value is obtained, the deviation is set as a printing position deviation, and the printing position deviation is accompanied with the rotation of the plate roll and the rotation of the impression cylinder roll. Reducing and zeroing,
Based on the detected value of the impression cylinder roll speed feedback, a plate roll speed command including the printing position deviation is generated, the plate roll is rotated by the plate roll speed command, and the printing roll deviation is based on the printing position deviation. A step of accelerating / decelerating the plate roll;
A printing apparatus comprising:

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