JP3993425B2 - Offset rotary printing press and speed control method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an offset rotary printing press and a speed control method thereof, and more particularly, an acceleration / deceleration command issued from a printing press control device that controls the offset rotary press and a desired speed is detected. An offset rotary printing press capable of accurately performing speed control in a speed control method and apparatus in which a command is sent to a motor control device, and the speed of a drive motor of the offset rotary press is controlled by the motor control device, and its The present invention relates to a speed control method .
[0002]
[Prior art]
As shown in FIGS. 3 and 4, the shaft-driven offset rotary printing machine 1 or the shaftless offset rotary printing machine 2 includes a paper feeding device 3, an infeed unit 4, a printing unit 5 for each color, a drying unit 6, Consists of units such as a cooling unit 7, a web pass / folding unit 8, etc. In order to drive the entire printing machine, a main shaft (line shaft) 43 is driven by a single main motor 9 having a necessary output, A shaft machine (FIG. 3) configured to transmit a driving force from a shaft via a driving shaft corresponding to each unit, and a separate motor 10 to 16 are provided for each unit so as to be driven in electronic synchronization. There is a shaftless machine (Fig. 4).
[0003]
In such a rotary offset printing press, as shown in FIG. 5A, in order to realize a stable printing density immediately after the start of printing, the ink roller is washed and then depends on the image line rate on the ink roller. The printing unit is idled at a constant low speed so as to restore the ink film thickness that does not depend on the standard ink amount and the pattern drawing rate, and the ink is called from the ink source roller by the ink call roller every specific rotation of the plate cylinder. Preliminary ink supply (QSI: Quick Start Inking) that delivers ink to the roller, as shown in Fig. 5 (B), printing is performed at a constant speed while decelerating at the end of printing and stopping ink supply (recalling ink) , And then stop printing (removing ink) to eliminate the previous job history on the ink roller (SPE: Smart Pri t End), and as shown in FIG. 5C, acceleration is performed at a speed higher than a certain speed at the time of acceleration from the speed for adjusting the color tone and the tension at the start of printing to the target speed (maximum speed). Doing so will cause the ink density to drop or misregister, so it accelerates in a range that does not cause density drop or misregistration, and works in conjunction with automatic registration devices, cutoff controllers, ink speed tracking functions, etc. Strategic acceleration (SAC: Step Acceleration Control) has been carried out to achieve formal printing until the maximum speed is reached, in order to stabilize color density, cutting, and printing density. Speed control is performed.
[0004]
In other words, the ink supply in the rotary offset printing press uses a cam or the like to deliver ink from the ink source roller to the ink roller at every specific rotation of the plate cylinder. Therefore, in the preliminary ink supply, the printing unit is idled at a constant speed. Ink delivery is performed for a certain period of time, and even when printing is reduced, printing is continued at a constant speed after the ink supply is stopped (ink recall), and ink deposition is also stopped after a certain period of time (demounting ink). This eliminates the previous job history on the ink roller. Also, in the stepwise acceleration at the start of printing, the speed increase amount in each stage is made constant and the number of printed sheets in each stage is made almost constant, so the acceleration to the next stage after a lapse of time according to the speed after the increase. In this way, the automatic registration device, the cut-off controller, the ink speed tracking function, and the like can be linked, and the accelerated printed matter can be the official printed matter.
[0005]
[Problems to be solved by the invention]
However, the motor speed control in the conventional rotary offset printing press is not always satisfactory for these requirements. That is, in the shaft machine shown in FIG. 3, when the printing press controller 41 sends an acceleration / deceleration command to the main machine controller 40 that controls the rotational speed of the motor 9, the main machine controller 40 accelerates the motor 9. The current speed of the motor is detected by the encoder 44 and the like, and this is fed back to the printing press controller 41. However, the main machine control device 40 itself does not perform acceleration / deceleration stop even when the motor reaches a predetermined speed, and the printing press control device. The acceleration / deceleration was stopped only when the acceleration / deceleration command was stopped by detecting that the speed 41 became a predetermined speed. This is also the case with the shaftless machine shown in FIG. 4. When an acceleration / deceleration command is issued from the printing press controller 41, the motor controller 42 performs only acceleration / deceleration of the motors 10 to 16 of each unit, The speeds of the motors 10 to 16 are detected by an encoder (not shown) and fed back to the printing press control device 41 through the motor control device 42 to detect that the printing press control device 41 has reached a predetermined speed. The acceleration / deceleration was stopped only by stopping the deceleration command.
[0006]
That is, the acceleration / deceleration of each motor 9 or 10 to 16 is stopped only when the printing press control device 41 or 42 detects that the motor speed has reached a predetermined speed. There is a problem that a time delay occurs in feedback by a noise countermeasure filter or the like for a feedback signal from the device 42 to the printing press control device 41, and an overshoot or undershoot occurs and a set speed cannot be obtained easily. Therefore, in the control configured to perform preliminary ink supply, reduction of printing, etc. for a certain period of time on the assumption that a certain speed has been reached as described above, the number of times of ink delivery and printing within this certain period of time due to the change in speed. The amount of reduction increased and decreased, hindering accurate ink film thickness formation and reduction of printing, affecting the increase in waste paper and the color tone of the next job. Also in stepped acceleration, if the speed is lower than the target speed as a result of acceleration, problems are unlikely to occur, but if the speed is higher than the target speed, the ink density drops and normal printing cannot be performed, and the web tension also fluctuates. The accuracy of cutting, etc. cannot be maintained, and it cannot be handled as official printing, resulting in waste paper.
[0007]
However, changing such a control method naturally increases the complexity and cost of the control device. Therefore, an object of the present invention is to provide an offset rotary printing press and a speed control method thereof that can perform accurate speed control without complicating a motor control device.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, claim 1 is a method invention,
A printing press control device that controls the rotary offset printing press ; and a motor control device that performs acceleration / deceleration of each drive motor that drives the printing unit of the offset rotary printing press. In a speed control method in an offset rotary printing press that sends a deceleration command to accelerate and decelerate the motor,
The printing press controller includes a stepped acceleration / deceleration parameter storage unit that stores a target speed, which is a constant speed after each stepped acceleration, and a speed to be finally reached, and an acceleration of a drive motor of the printing unit. An acceleration / deceleration rate storage unit for storing the deceleration rate is prepared,
By the printing press control device, and the target speed is a constant speed after the stepped acceleration stored in the stair-like acceleration and deceleration parameter storage unit, from said deceleration rate storing unit of the drive motor of the respective printing units and acceleration and deceleration rates, reads the current speed of the drive motor transmitted from the motor controller, the target speed, gives the acceleration and deceleration rate and the current speed to the computing unit, from the current speed of each drive motor A time t calculating step for calculating a time t until the target speed is reached;
An acceleration / deceleration step of sending an acceleration / deceleration command from the printing press control device to the motor control device and performing acceleration / deceleration of each drive motor that drives the printing unit at the acceleration / deceleration rate until after the calculated time t ;
Thereafter, the acceleration / deceleration command is stopped after the elapse of the time t, the constant speed control of the speed of each drive motor is performed, and the time T required for the print control device to print a certain number of sheets from the current speed of each drive motor. A constant speed control step for performing feedback control so that each of the drive motors is controlled at a constant speed during the time T,
The time t calculation step, the acceleration / deceleration step, and the constant speed control step are repeated a plurality of times to reach a speed to be finally reached .
[0009]
The claim 2 apparatus an invention for carrying out the method invention of claim 1,
A printing press control device that controls the rotary offset printing press ; and a motor control device that performs acceleration / deceleration of each drive motor that drives the printing unit of the offset rotary printing press. In an offset rotary printing press that sends a deceleration command to accelerate and decelerate the motor,
Stepwise acceleration / deceleration parameter storage unit storing a target speed, which is a constant speed after each stepwise acceleration, and a speed to be finally reached in the printing press control device, and acceleration / deceleration of a drive motor of the printing unit An acceleration / deceleration rate storage unit for storing the rate, and
The printing press control device includes a target speed that is a constant speed after each stepwise acceleration stored in the stepwise acceleration / deceleration parameter storage unit, and a drive motor of each printing unit from the acceleration / deceleration rate storage unit current speed of the acceleration and deceleration rate, reads the current speed of the drive motor transmitted from the motor controller, the target speed, gives the acceleration and deceleration rate and the current speed to the computing unit, of the respective drive motor and time t calculating means for calculating a time t until reaching the target speed from,
Acceleration / deceleration means that sends an acceleration / deceleration command from the printing press control device to the motor control device and performs acceleration / deceleration of each drive motor that drives the printing unit at the acceleration / deceleration rate until after the calculated time t ;
The acceleration / deceleration command is stopped after the elapse of time t, and the speed of each driving motor is controlled at a constant speed, and the time T required for the print control device to print a certain number of sheets from the current speed of each driving motor is calculated. And a constant speed control means for performing feedback control so that each of the drive motors is controlled at a constant speed during the T time ,
The time t calculation means, the acceleration / deceleration means, and the constant speed control means are sequentially operated, and the time t calculation operation, the acceleration / deceleration operation, and the constant speed control operation based on the respective means are repeated a plurality of times to obtain a final result. In the rotary offset printing press, the speed is controlled so as to reach the speed to be reached .
[0010]
By controlling the speed of the offset rotary printing press in this way, the load on the offset rotary press is almost constant. Therefore, the time required to reach the desired speed can be accurately calculated based on the acceleration / deceleration rate of the drive motor and the current speed. A desired speed can be obtained without causing a chute or the like. Therefore, an accurate speed control method and apparatus can be provided without making the conventional control apparatus complicated and expensive.
In addition , the acceleration amount at each stage is always constant and accurate step-like acceleration can be realized, and the accuracy of registration, cutting, density, etc. is always stable, and stable formal printing is possible without producing waste paper. Become.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. This is just an example.
[0014]
FIG. 1 is a schematic block diagram of a speed control apparatus in an offset rotary printing press showing an embodiment of the present invention, and FIG. 2 is a flowchart of a speed control method in the offset rotary press according to the present invention. In the figure, 1 is an offset rotary printing press using a shaft for driving, 2 is a shaftless offset rotary printing press that does not use a shaft, 3 is a paper feeding device in the offset rotary printing press, 4 is an infeed unit, 5 is a printing unit, 6 is a drying unit, 7 is a cooling unit, 8 is a web pass / folding unit, 9 is a main motor of the shaft machine, 10 to 16 are drive motors in a shaftless offset rotary printing machine, 17 is a motor control device, and 18 is printing. The machine control device 19 has a QSI (Quick Start Inking) button, a SAC (Step Acceleration Control) button, a SPE (Smart Print End) button, and so on. Control panel for directing staircase acceleration, 20 for control unit, 21 for performance , 22 is a storage unit, 23 is a drive motor 9 and an acceleration / deceleration rate storage unit that stores acceleration / deceleration rates of 10 to 16, and 24 is a parameter that stores a target speed, preliminary supply time, etc. in preliminary ink supply. The QSI (Quick Start Inking) parameter storage unit 25 is a SAC (Step Acceleration Control) that stores parameters such as a target speed per step in the stepped acceleration, a duration of the target speed, and a speed to be finally reached. ) Parameter storage unit, 26 is an SPE (Smart Print End) parameter storage unit that stores parameters such as a target speed for printing reduction, a printing reduction time, 43 is a main shaft (line shaft) in a shaft machine, and 44 is an encoder .
[0015]
The outline of the speed control method in the offset rotary printing press according to the present invention configured as described above will be described with reference to the flowchart of FIG. Now, in step S31, when any of the QSI (ink pre-supply) button, SPE (reducing printing) button, and SAC (stepped acceleration) button on the control panel 19 is pressed and a signal is transmitted to the control unit 20, this control is performed. In step S32, the unit 20 reads the corresponding parameters from the QSI parameter storage unit 24, the SAC parameter storage unit 25, and the SPE parameter storage unit 26, and acquires the control method and the target speed.
[0016]
The control unit 20 then sends the current speed of the drive motor 9 or 10-16 sent from the motor control device 17 in the next step S33 and the acceleration / deceleration rate of each motor stored in the acceleration / deceleration rate storage unit 23. In step S34, this value is sent to the calculation unit 21 to calculate how long it takes to reach the target speed acquired in step S32, that is, the acceleration / deceleration time t.
[0017]
When the acceleration / deceleration time t is calculated in this way, the control unit 20 sends an acceleration / deceleration command to the motor control device 17 in the next step S35, and the motor control device 17 starts acceleration / deceleration of the drive motors 9 and 10-16. Then, the control unit 20 monitors whether or not the time t has passed in step S36, and when the time t has passed, stops the acceleration / deceleration command sent to the motor control device 17 in step S37. Therefore, the motor control device 17 stops the acceleration / deceleration of the drive motors 9 and 10-16, and these motors rotate at the target speed.
[0018]
Since therefore the target speed rotation of the drive motor 9,10～16 is obtained, ink reserve supply described above in this state, reduced printing, the line Ukoto a stepped acceleration or the like, stable ink preliminary supply, reduce printing, stepped You can see the acceleration.
[0019]
That is, in the preliminary ink supply, when the QSI button on the control panel 19 is pressed, the control unit 20 calls the target speed and preliminary supply time for performing preliminary ink supply stored in the QSI parameter storage unit 24, and further the acceleration / deceleration rate. The acceleration / deceleration rate of each motor (9 for a shaft machine, 11 to 14 for a shaftless machine) corresponding to the printing unit 5 is read from the storage unit 23. Then, the called target speed and acceleration / deceleration rate are given to the calculation unit 21, and a time t until the target speed is reached after each drive motor is stopped is calculated.
[0020]
When the time t until the target speed is reached is calculated, the control unit 20 sends an acceleration command to the motor control device 17 as described above, and stops the acceleration command after the calculated time t. The motor control device 17 accelerates each drive motor only during this time t, and after the acceleration command stops, it rotates the drive motor at a constant speed, and the speed of each drive motor is set to the printing press control device 18 as in the conventional case. And monitoring that the drive motor rotates at a constant speed. Therefore, the control unit 20 performs preliminary ink supply for the preliminary supply time read from the QSI parameter storage unit 24. When this is completed, a stop command for each drive motor is sent to the motor controller 17 to stop each drive motor.
[0021]
In this way, an accurate target speed can be obtained. If the preliminary ink supply is performed for a certain period of time, a fixed amount of ink is supplied to the ink roller, and the ink is transferred due to variations in the idling speed of each printing unit 5 as in the past. The number of times does not increase or decrease, and an accurate ink film thickness is formed.
[0022]
The same applies to the reduction of printing. When the SPE button on the control panel 19 is pressed, the control unit 20 calls the target speed of printing reduction and the printing reduction time recorded in the SPE parameter storage unit 26, and further increases the acceleration / deceleration rate. The acceleration / deceleration rate of each motor (9 for a shaft machine, 11 to 14 for a shaftless machine) corresponding to the printing unit 5 is read from the storage unit 23 and the current speed of each drive motor is acquired from the motor control device 17. Then, the calculation unit 21 calculates a time t required to reach the target speed for reduction of printing from the current speed of each drive motor.
[0023]
When the time t until the target speed is reached is calculated, the control unit 20 sends a deceleration command to the motor control device 17 as described above, and stops the deceleration command after the calculated time t. Therefore, the motor control device 17 decelerates each drive motor only during this time t, and after the deceleration command is stopped, rotates the drive motor at a constant speed and sets the speed of each drive motor to the printing press control device 18 as before. And monitoring that the drive motor rotates at a constant speed. For this reason, the control unit 20 removes the ink call at this stage, performs the printing reduction for the printing reduction time read from the SPE parameter storage unit 26, and when this is completed, removes the ink roller and then issues a stop command for each drive motor. It sends to the motor control apparatus 17 and stops each drive motor.
[0024]
By doing this, an accurate reduction speed can be obtained, so if the reduction in printing is performed for a certain period of time, the ink amount of the ink roller can be reduced accurately. Can be prevented from being affected.
[0025]
In addition, stepped acceleration can be performed in the same manner, and by pressing the SAC button on the control panel 19, the control unit 20 determines the target speed for each stepped acceleration recorded in the SAC parameter storage unit 25 and the constant speed rotation time at each step. Further, the acceleration / deceleration rate of each motor (9 for a shaft machine, 11 to 14 for a shaftless machine) is read from the acceleration / deceleration rate storage unit 23 and the current speed of each drive motor is determined by the motor. Obtained from the control device 17. Then, the calculation unit 21 calculates a time t required to reach the target speed in the first stage from the current speed of each drive motor.
[0026]
When the time t until the target speed is reached is calculated, the control unit 20 sends an acceleration command to the motor control device 17 as described above, and stops the acceleration command after the calculated time t. Therefore, the motor control device 17 accelerates each drive motor only during this time t, and after the acceleration command is stopped, rotates the drive motor at a constant speed and sets the speed of each drive motor to the printing press control device 18 as in the prior art. And monitoring that the drive motor rotates at a constant speed. Then, the control unit 20 causes the calculation unit 21 to calculate the time T required to print a certain number of sheets at this speed, and after the T time has elapsed, the calculation unit calculates the acceleration time t in the same manner as described above. Then, an acceleration command is sent to the motor control device 17 and the acceleration command is stopped after the calculated time t. Therefore, similarly to the above, the motor control device 17 accelerates each drive motor only during this time t, and after the acceleration command is stopped, the drive motor is rotated at a constant speed, and the speed of each drive motor is set to the printing machine as before. It feeds back to the control device 18 and monitors that the drive motor rotates at a constant speed. In the same manner, this is repeated until each drive motor reaches the maximum speed.
[0027]
By doing this, the amount of acceleration at each stage is always constant and accurate step-like acceleration can be realized, and the accuracy of registration, cutting, density, etc. is always stable and stable formal printing without giving out waste paper Is possible.
[0028]
【The invention's effect】
According to the onset light as described above, the acceleration and deceleration rate and the current speed of the drive motor can accurately calculate the time to reach a desired speed, thus it is possible to obtain a desired rate without causing overshooting. Therefore, the conventional control system complexity, without expensive, can be provided Hisage the accurate speed control.
[0029]
According to the first, second, fourth , and fifth aspects of the present invention, in the control in which the preliminary ink supply and the reduction of printing are performed for a predetermined time on the assumption of a constant speed, the number of times of ink delivery and the amount of reduction in printing are accurately determined. Thus, accurate ink film thickness formation and reduction in printing can be realized without causing waste paper. In addition, since the acceleration amount in each step can be made constant even in stepped acceleration, registration, cutting, density, etc. can be performed with high accuracy, and formal printing can be performed without giving out waste paper even during acceleration.
Therefore, since the target speed rotation of the drive motors 9 and 10 to 16 can be obtained in any of the inventions, stable ink preliminary supply and printing can be performed by performing the ink preliminary supply, printing reduction, stepwise acceleration, etc. in this state. You can actually see stepped acceleration.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of a speed control device in a web offset printing press showing an embodiment of the present invention.
FIG. 2 is a flowchart of a speed control method in an offset rotary printing press according to the present invention.
FIG. 3 is a diagram for explaining a speed control method in a conventional rotary offset printing press.
FIG. 4 is a diagram for explaining a speed control method in a conventional rotary offset printing press.
FIG. 5 is a diagram for explaining ink preliminary supply, reduction in printing, and stepped acceleration.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft drive type offset rotary press 2 Shaftless type offset rotary press 3 Paper feeder 4 Infeed part 5 Printing unit 6 Drying part 7 Cooling part 8 Web path | folder part 9 Main motors 10, 11, 12, 13 , 14, 15, 16 Drive motor 17 Motor control device 18 Printing press control device 19 Control panel 20 Control unit 21 Calculation unit 22 Storage unit 23 Acceleration / deceleration rate storage unit 24 QSI parameter storage unit 25 SAC parameter storage unit 26 SPE parameter storage unit

Claims (2)

A printing press control device that controls the rotary offset printing press ; and a motor control device that performs acceleration / deceleration of each drive motor that drives the printing unit of the offset rotary printing press. In a speed control method in an offset rotary printing press that sends a deceleration command to accelerate and decelerate the motor,
The printing press controller includes a stepped acceleration / deceleration parameter storage unit that stores a target speed, which is a constant speed after each stepped acceleration, and a speed to be finally reached, and an acceleration of a drive motor of the printing unit. An acceleration / deceleration rate storage unit for storing the deceleration rate is prepared,
A target speed that is a constant speed after the stepped acceleration stored in the stepwise acceleration / deceleration parameter storage unit by the printing press control device, and a drive motor of each printing unit from the acceleration / deceleration rate storage unit. and acceleration and deceleration rates, reads the current speed of the drive motor transmitted from the motor controller, the target speed, gives the acceleration and deceleration rate and the current speed to the computing unit, from the current speed of each drive motor A time t calculating step for calculating a time t until the target speed is reached;
An acceleration / deceleration step of sending an acceleration / deceleration command from the printing press control device to the motor control device and performing acceleration / deceleration of each drive motor that drives the printing unit at the acceleration / deceleration rate until after the calculated time t ;
Thereafter, the acceleration / deceleration command is stopped after the elapse of the time t, the constant speed control of the speed of each drive motor is performed, and the time T required for the print control device to print a certain number of sheets from the current speed of each drive motor. A constant speed control step for performing feedback control so that each of the drive motors is controlled at a constant speed during the time T,
A speed control method for a rotary offset printing press, wherein the time t calculation step, the acceleration / deceleration step, and the constant speed control step are repeated a plurality of times to reach a speed that should be finally reached . A printing press control device that controls the rotary offset printing press ; and a motor control device that performs acceleration / deceleration of each drive motor that drives the printing unit of the offset rotary printing press. In an offset rotary printing press that sends a deceleration command to accelerate and decelerate the motor,
Stepwise acceleration / deceleration parameter storage unit storing a target speed, which is a constant speed after each stepwise acceleration, and a speed to be finally reached in the printing press control device, and acceleration / deceleration of a drive motor of the printing unit An acceleration / deceleration rate storage unit for storing the rate, and
The printing press control device includes a target speed that is a constant speed after each stepwise acceleration stored in the stepwise acceleration / deceleration parameter storage unit, and a drive motor of each printing unit from the acceleration / deceleration rate storage unit current speed of the acceleration and deceleration rate, reads the current speed of the drive motor transmitted from the motor controller, the target speed, gives the acceleration and deceleration rate and the current speed to the computing unit, of the respective drive motor and time t calculating means for calculating a time t until reaching the target speed from,
Acceleration / deceleration means that sends an acceleration / deceleration command from the printing press control device to the motor control device and performs acceleration / deceleration of each drive motor that drives the printing unit at the acceleration / deceleration rate until after the calculated time t ;
The acceleration / deceleration command is stopped after the elapse of time t, and the speed of each driving motor is controlled at a constant speed, and the time T required for the print control device to print a certain number of sheets from the current speed of each driving motor is calculated. And a constant speed control means for performing feedback control so that each of the drive motors is controlled at a constant speed during the T time ,
The time t calculation means, the acceleration / deceleration means, and the constant speed control means are sequentially operated, and the time t calculation operation, the acceleration / deceleration operation, and the constant speed control operation based on the respective means are repeated a plurality of times to obtain a final result. A rotary offset printing press characterized by controlling the speed so as to reach a speed that should be achieved .

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