JP3893372B2 - Method and apparatus for preventing paper breakage during power failure in shaftless rotary press - Google Patents

Description

  The present invention relates to a shaftless rotary press that performs newspaper printing while providing a motor for each unit such as a paper feeding unit, a printing unit, and a folding unit, and controlling the driving of each motor with high accuracy. The present invention relates to a method and an apparatus for preventing breakage and the like by controlling the travel of traveling paper during a power failure.

The running paper of the newspaper rotary press is supplied from the paper roll of the paper feed unit, printed on one or both sides by the printing unit, guided by the rail frame unit, overlapped by the folding unit, folded, and cut into newspaper size. Are discharged.
At this time, in order to synchronize the drive of the printing part, rail frame part, and folding part, the motor that drives each part is connected to the conventional rotary press with the mechanical axis connected to the electronic axis, not the mechanical axis. A shaftless rotary press having a shaftless drive system is known.

  A shaftless rotary press is a rotary press that rotates a rotary cylinder including a plate cylinder, a blanket cylinder, a folding cylinder, and a saw cylinder by a motor that is driven and controlled by an independent control system. In comparison, there is an advantage that the connecting shaft, the vertical axis, the gear box, the clutch, and the like can be eliminated, and the device configuration of the rotary press can be simplified.

By the way, when an unexpected power failure occurs during the operation of the rotary press, the rotary press is a motor attached to each part with the stop circuit operating to the safe side for the purpose of ensuring human safety and protecting the machine. Stops naturally (free run).
Here, in the conventional rotary press, since each drive unit is connected by a mechanical shaft, the rotation of the printing cylinder, the web, the drag roller, etc. is always kept in synchronization, and the tension of the running paper is not greatly changed. In the event of a power failure, problems such as paper breaks and wrapping rarely occur.

  However, with a shaftless rotary press that controls each drive unit, if a power failure occurs during printing operation, the printing system and drag roller will be released, not to mention that good printing will not be performed. Etc., each drive roller rotates at an inertial speed according to the difference in each inertial force, and the continuous paper running in the rotary press acts on the continuous paper, and the continuous paper breaks. There is a problem that troubles such as ruptured continuous paper wraps around a driving roller, a guide roller or the like are likely to occur.

And, it takes a lot of time to recover to the ready state for printing, such as removing the rolled continuous paper and re-passing the continuous paper to the running course. There was a problem.
Therefore, in order to solve such a problem, the drive of the printing cylinder and the drag roller are synchronized using a driving uninterruptible power supply system with the control by the control system remaining in the event of a power failure, and the running paper There has been proposed a technique for maintaining a constant tension (see, for example, Patent Documents 1 and 2).
JP 2002-307663 A JP 2002-361838 A

  However, the technique described in the above patent document requires a power source for synchronously driving the printing cylinder and the drag roller at the time of a power failure, and there is a problem that the apparatus configuration becomes complicated. In particular, an uninterruptible power supply for driving in order to continue driving of the driving roller of the folding part including the drag roller that plays the role of pulling the running paper (the dragging roller of the folding part is described as RTF (Roller Top of Former)) The apparatus has a problem that a large capacity is required, the equipment cost is high, and the rotary press is enlarged.

On the other hand, in recent years, the possibility of a power outage is extremely small, and it is a waste of cost to make a large-scale and expensive capital investment in preparation for a power outage that rarely occurs.
The present invention does not require special equipment or large-scale equipment for power outages as described above, and does not cause the running paper to break due to fluctuations in the tension of the running rod at the time of power outage during operation of the shaftless rotary press. It is an object of the present invention to provide a method and an apparatus for preventing paper breakage at the time of a power failure in a shaftless rotary press capable of effectively preventing paper breakage and entrainment.

  In order to achieve the above object, the invention described in claim 1 includes a paper feeding unit, a printing unit, a rail frame unit, and a folding unit, and controls driving of a driving roller provided in each unit. The traveling paper is supplied from the winding paper of the paper feeding unit to the printing unit while applying a predetermined tension to the printing unit, and is subjected to predetermined printing, and the traveling paper is passed through the rail frame unit in a predetermined stacking order. Thereafter, in the method of preventing paper breakage at the time of a power failure in a shaftless rotary press that cuts and folds to a newspaper size at the folding part, a step of detecting a power failure of a commercial power source, and the drive from the control backup power source simultaneously with the power failure detection A step of supplying power to a control device for controlling the driving of the rollers, a step of applying stop braking to the web of the paper feed unit simultaneously with detection of a power failure, and a control of the control device simultaneously with detection of a power failure. The step of separating the control system of the other driving rollers excluding the driving roller of the printing unit from the system, and the regenerative power of the motor that rotates the driving roller of the printing unit, based on a command from the control device, the printing And a step of stopping the driving roller of the printing unit before the other driving roller while performing deceleration control of the driving roller of the unit.

  According to this method, when a commercial power failure is detected, stop braking is applied to the web of the paper feed unit. The stop braking is of a size corresponding to the outer diameter of the web and the type of web such as A (paper 4 pages wide), C (3 pages wide), and D (2 pages wide). It is. Simultaneously with the power failure, power is supplied from the backup power source to the control device, and the normal operation mode is switched to the power failure operation mode. In this switching, the control system of other drive rollers excluding the drive roller of the printing unit is disconnected. Therefore, the other driving rollers except the printing unit decelerate and stop while freely rotating simultaneously with a power failure.

  The traveling paper travels by the force that the printing cylinder sends out from the printing unit, the inertia rotation of the drag roller and guide roller provided on the rail frame unit, and the inertia rotation of the RTF of the folding unit. In the printing unit, the driving roller tries to rotate at a rotational speed corresponding to each inertia at the same time as the power failure, but the control device controls the deceleration of the driving roller using regenerative power. Accordingly, the traveling paper is fed out from the printing unit and the driving roller of the printing unit is stopped before the other driving roller, so that the traveling paper is large between the folding unit and the printing unit. There is no slack.

  In addition, the traveling paper travels at a speed that is sent out from the printing unit, whereby the other driving rollers are braked and the stop time of the other driving rollers can be shortened. Further, there is no inconvenience that the running paper is broken or the running paper is wound around a roller such as a driving roller.

  Many shaftless rotary presses have a plurality of printing units in one printing section. In the case of having a plurality of printing units, it is necessary not only to perform deceleration control so that the running paper does not break between the printing unit and the folding unit, but also to synchronize between the driving rollers of each printing unit. . That is, the invention according to claim 2 uses the regenerative power of each motor that rotates each drive roller of the printing unit after a power failure is detected when a plurality of printing units are provided in the printing unit. Thus, the drive roller is controlled to be decelerated so as to rotate synchronously.

The invention according to claim 3 further includes a step of cutting the running paper in the vicinity of the former of the folding portion simultaneously with detection of a power failure.
When the drive control is canceled due to a power failure, the rotation of the driving rollers such as the folding cylinder of the folding section and the saw cylinder will vary, and the running paper cannot be synchronized with the running paper. The introduction increases the possibility of paper jams. Therefore, as described in claim 3, after the power failure, the running paper passing through the former is cut off on the former, and the running paper is cut out before entering the folding cylinder and the saw cylinder and discharged out of the area. Inconvenience can be avoided.

As deceleration control by regenerative power, for example, as described in claim 4, a variable resistor for supplying the regenerative power is prepared, and a resistance value of the variable resistor is adjusted based on a command from the control device. It is good to do so.
In this case, the control device may adjust the resistance value of the variable resistor so that the time for stopping the driving roller of the printing unit by the regenerative power is shorter than the stop time by the normal stop command. .
For example, when the driving roller of the printing unit stops in 22 to 26 seconds in the normal stop mode, in the stop mode at the time of a power failure, the time is sufficient to generate regenerative power, and the above 22 seconds to 26 described above. Deceleration control is performed so that the driving roller of the printing unit stops in a time shorter than a second.

  As described in claim 5, the stop control of the driving roller of the printing unit is performed by the control device in advance with information on the running paper such as the number of running papers and the rotation speed of the driving roller of the printing unit during normal operation. It is preferable to input a relationship with the stop time of the driving roller of the printing unit. In this way, the control device determines the stop time of the driving roller of the printing unit according to the input content, and the driving roller of the printing unit stops at the stop time. Decelerates the rotation speed of the drive roller.

The above method can be performed by a paper break prevention device described in claim 6 and the following.
According to a sixth aspect of the present invention, there is provided a paper breakage prevention device including a paper feeding unit, a printing unit, a rail frame unit, and a folding unit, and controls driving of a driving roller provided in each unit to keep the running paper constant. The running paper is supplied from the winding paper of the paper feeding unit to the printing unit while applying a predetermined tension to perform predetermined printing, and the running paper is passed through the rail frame unit in a predetermined stacking order. In a shaftless rotary press that cuts and folds into a newspaper size at the time of power failure, it is a device for preventing paper breakage at the time of a power failure, and a power failure detection unit that detects a power failure of the commercial power supply and when this power failure detection unit outputs a detection signal, A backup power supply for control that supplies power to the control device, a motor that rotates the drive roller of the printing unit, an inverter that outputs a speed command to the motor, and a regenerative power of the motor provided in the inverter A variable resistor that decelerates the rotational speed of the motor by a discharge resistor, and when the power failure detection unit detects a power failure, the mode is switched from the normal operation mode to the power failure operation mode, and the driving roller of the printing unit The other driving rollers except for are disconnected from the control system, and a command to adjust the resistance value of each of the variable resistors is output, and the driving roller is decelerated and stopped before the other driving rollers. And a control device.

Further, in the case where a plurality of printing units are provided in the printing unit, as described in claim 7, after detecting a power failure, the control device causes each motor to rotate each drive roller of the printing unit. It is preferable to output a command for adjusting the resistance value of each of the variable resistors so that the driving roller is rotated synchronously by using the regenerative power.
Further, the paper break prevention device according to claim 8 is provided with a cutting means for cutting the running paper between the former and the saw drum and the folding drum of the folding portion, and the power failure detection unit detects a power failure. Sometimes, the cutting means is driven to cut the running paper.

  According to the present invention, while applying one or more printing cylinders to the printing unit while the brake is applied so that the web is not unraveled by the paper feeding unit in the paper feeding unit, the deceleration synchronization of each drive roller is performed. Since regenerative power is used for control, there is no need for an uninterruptible power supply for driving the drive rollers of the folding machine, rail frame unit, printing unit, etc. synchronously after a power failure, and the device becomes complicated and large. Therefore, it is possible to construct a rotary press that does not cause the running paper to be cut from the paper feeding unit to the forma at low cost.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
First, a schematic configuration of a shaftless rotary press according to this embodiment will be described with reference to FIG.
The shaftless rotary press includes a paper feeding unit 1 that supplies the traveling paper P from the web 11, a printing unit 2 that performs predetermined printing on the traveling paper P supplied from the paper feeding unit 1, and a plurality of traveling papers P. It has a rail frame part 3 that guides it in a predetermined overlapping order, and a folding part 4 that cuts and overlaps the traveling paper P into newspaper size, folds it, and discharges it.

  A paper roll 11 is set in the paper supply unit 1, and at the time of a power failure, excessive feeding of the running paper P from the winding paper 11 is suppressed, so that the running paper P does not sag, and A brake device 111 is provided for applying a tension that does not cause the sheet to be cut. As the brake device 111, an air brake or the like that suppresses the rotation of the web 11 by fluid pressure can be used.

  The rail frame unit 3 has a slitter that divides the running paper P as necessary, a turn bar that changes the running direction of the running paper P, a bay window that allows a multicolor printing page to be interrupted at an arbitrary position, and margin adjustment in the vertical direction. Compensators and the like are included (none of these are shown). Motors M5 and M6 are connected to a drag roller 31 integrated with the slitter, a guide roller 32 for guiding the running paper P, and the like so as to rotate them at a speed synchronized with the running speed of the running paper P. It has become.

  The folding unit 4 includes an RTF 41 that pulls the traveling paper P and travels the traveling paper P, a nipping roller 42 that folds the traveling paper P, and rollers such as a folding cylinder 43 and a saw cylinder (not shown). Is provided. The RTF 41 and the folding cylinder 43 are provided with motors M7, M9,... For rotating them. In addition, a former paper cutter 45 for cutting the running paper P in the event of a power failure is provided in the vicinity of the former 44 upstream of the folding cylinder 43.

  In this embodiment, the printing unit 2 has four printing units 21, 22, 23, 24 arranged vertically, and each printing unit 21, 22, 23, 24 has a plate cylinder 21 a, 22 a, 23 a, There is provided a printing set consisting of 24a and blanket cylinders 21b, 22b, 23b, 24b. Motors M1, M2, M3, and M4 are connected to the plate cylinders 21a, 22a, 23a, and 24a to rotate the plate cylinders 21a to 24a and the blanket cylinders 21b to 24b.

Further, guide rollers GR are appropriately disposed between the paper feeding unit 1 and the printing unit 2, between the printing unit 2 and the rail frame unit 3, and between the rail frame unit 3 and the folding unit 4, respectively. The motor MR is rotated at a speed synchronized with the running speed of the running paper P.
The driving of each of the motors M1, M2, M3,... MR is controlled by a control device so that the running paper P can run from the paper feeding unit 1 to the folding unit 4 with a certain tension applied. Is done.

FIG. 2 is a control block diagram of a drive system in the shaftless rotary press of FIG.
The power supply circuit 9 extending from the commercial power supply AC includes inverters 211 to 241 that output speed commands to the motors M1 to M4 of the printing unit 1 and motors M5, 6,. Inverters 311, 321... That output speed commands are connected in parallel. Further, the control device 7 that outputs a drive control command to the motors M1, 2, 3,... Via the inverters 211 to 241 and the inverters 311, 321,. It is connected to the circuit 9.

  Between the commercial power source AC and the inverters 211 to 241 and the inverters 311, 321,..., A power failure detection unit 6 that detects a power failure of the commercial power source AC is provided. When a power failure occurs in the commercial power supply AC, a power failure detection signal is output from the power failure detection unit 6 to the control device 7. The power failure detection signal is also transmitted to the brake device 111 of the paper feed unit 1, whereby stop braking is applied to the web 11 of the paper feed unit 1. The magnitude of the stop braking depends on the outer diameter of the web 11 when the stop braking is applied and the type of the web 11 such as A, C, D, etc., and is input to the control device in advance. The outer diameter of the web 11 can be obtained by calculation from the rotational speed of the center cone supporting the web 11 and the running speed of the running paper P at that time.

  Further, between the power failure detection unit 6 and the inverters 211 to 241, the inverters 311, 321..., There is a switch 8 that operates OFF when the power failure detection unit 6 detects a power failure and shuts off the power supply circuit 9. Is provided. The switch 8 is maintained in an OFF state unless the operator manually switches it ON. After the power failure is recovered, the operator manually checks the switch 8 after confirming safety such as the rollers of each part being stopped. The power supply circuit 9 is restored by switching from OFF to ON by operating.

  Further, the control device 7 is provided with a control backup power source 72 that supplies power to the control device 7 instead of the commercial power source AC when a power failure occurs, and a power failure detection signal is sent from the power failure detection unit 6 to the control device 7. When input, the commercial power supply AC is immediately switched to the control backup power supply 72.

  In this embodiment, the control device 7 performs a drive control of the motors M1 to M4 and the motors M5, 6... Via the inverters 211 to 241 and the inverters 311, 321,. In the event of a power failure, the motor M5, 6... Drive system is disconnected, leaving only the motor M1 to M4 drive system, and performing synchronous deceleration control of the motors M1 to M4 via the inverters 211 to 241. The mode can be switched between modes.

  In the operation mode during a power failure, the control device 7 is configured such that the plate cylinders 21a to 24a and the blanket cylinders 21b to 24b of the printing unit 2 have rollers other than the printing unit 2, specifically, the form paper from the printing unit 2. Deceleration control is performed so as to stop before the rollers such as the drag roller 31, the guide roller 32, the guide roller GR, and the RTF 41 arranged up to the cutter 45. In addition, control is performed so that the plate cylinders 21a to 24a and the blanket cylinders 21b to 24b are stopped in a shorter time than when a normal stop command is issued.

  The inverters 211 to 241 are provided with variable resistors 212, 222, 232, and 242 through which regenerative power of the motors M1 to M4 flows. By changing the resistance values of the variable resistors 212, 222, 232 and 242, the braking force applied to the motors M1 to M4 can be changed. The resistance values of the variable resistors 212, 222, 232, and 242 are adjusted by a command from the control device 7. The control device 7 obtains the rotational speed of each of the motors M1 to M4 based on the speed signal fed back from the motors M1 to M4, and decelerates at a constant rate until the four motors M1 to M4 stop in synchronization. Thus, a command to change the resistance value is output to the inverters 211 to 241.

FIG. 3 is a flowchart for explaining a processing procedure in the control system shown in FIG.
In the normal operation mode, a drive control command is output from the control device 7 to each of the motors M1 to M4 and the motors M5, 6,..., And each unit (printing unit 2) is rotated at a rotational speed corresponding to the traveling speed and tension of the traveling paper P. , The driving of the driving roller of the rail frame portion 3 and the folding portion 4) is controlled (step S1).
When a power failure occurs in the commercial power supply AC, the power failure is detected by the power failure detection unit 6, and a power failure detection signal is transmitted to the control device 7, the switch 8, and the brake device 111.

  As a result, the switch unit 8 shuts off the power supply circuit 9 of the commercial power supply AC (step S3), the control device 7 switches the normal operation mode to the operation mode during power failure (step S4), and the sheet feeding unit 1 uses the brake device 111. The web P is braked (step S5). Further, the running paper P is cut by the former paper cutter 45 above the former 44 (step S6). Further, simultaneously with the power failure, the control device 7 is supplied with power from the control backup power source 72 (step S7).

On the other hand, information on the driving speed is transmitted to the control device 7 from the feedback of the speed signals of the motors M1 to M4 (step S8). The control device 7 predicts the stop time of the plate cylinders 21a, 22a, 23a, 24a in the printing unit 2 from this operation speed (step S9).
The stop time can be predicted based on, for example, the relationship between the conditions relating to the running paper, such as the number of running papers, and the driving speeds (running speeds of the running paper) of the motors M1 to M4 before the occurrence of the power failure.

FIG. 4 is an example of prediction of the stop time, and the number of running sheets (indicated by the symbol n in FIG. 4), the driving speeds of the motors M1 to M4 (running speed of the running sheets), and the plate cylinder stop in the normal stop mode. It is a graph which shows the relationship with time.
As shown in the figure, when a certain correlation is established between the number n of the running paper P, the operation speed of the motors M1 to M4, and the stop time of the plate cylinder, a relational expression between these is obtained in advance through experiments or the like. Thus, it is possible to estimate the time from when the power failure occurs until the plate cylinders 21a, 22a, 23a, 24a stop.

  The control device 7 sets a target value for stopping the plate cylinders 21a, 22a, 23a, 24a based on the stop time estimated in this way, and sets the variable resistors 212, 222, The resistance values of 232 and 242 are controlled to perform deceleration control of the motors M1 to M4 (step S10).

Further, the control device 7 performs the deceleration control so that the four motors M1 to M4 are stopped within the target time, and at the same time performs the deceleration control so that the four motors M1 to M4 are synchronized (step S11).
The processes in steps S8 to S11 described above are preferably repeated at intervals of, for example, 1 to 2 seconds until the plate cylinders 21a, 22a, 23a, and 24a are stopped (step S12).

  The paper break prevention method and the paper break prevention device of the present invention are not limited to the shaftless rotary press having four printing units as described above in one printing section, and one or two printing units are printed in one. The present invention can also be applied to other shaftless rotary presses in the section.

It is a figure explaining the schematic structure of the drive system of a shaftless rotary press. It is a control block diagram of the drive system of the rotary press in this embodiment. It is a flowchart concerning one Embodiment of the prevention method of a paper break etc. of this invention. It is a graph which shows an example of stop prediction and shows the relationship between the number of sheets of travel paper, the travel speed before the occurrence of a power failure, and the stop time of the plate cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feed part 2 Printing part 3 Rail frame part 4 Folding part 6 Power failure detection part 7 Control apparatus 8 Switch 9 Power supply circuit

Claims (8)

The paper feeding unit, the printing unit, the rail frame unit, and the folding unit are provided, and the driving roller provided in each unit is controlled to apply a certain tension to the running paper from the winding paper of the paper feeding unit. In a shaftless rotary press that feeds traveling paper to a printing unit, performs predetermined printing, passes the rail frame unit to pass the traveling paper in a predetermined stacking order, and then cuts and folds the newspaper into newspaper size at the folding unit In the prevention method of paper breakage at the time of power failure,
Detecting a power failure of the commercial power supply;
Supplying power to a control device that controls driving of the drive roller from a backup power supply for control simultaneously with power failure detection;
Simultaneously with the detection of a power failure, a step of applying stop braking to the web of the paper feeding unit;
Simultaneously with the detection of a power failure, disconnecting the control system of the other drive rollers excluding the drive roller of the printing unit from the control system of the control device;
Using the regenerative power of the motor that rotates the driving roller of the printing unit, based on a command from the control device, the printing roller driving roller is decelerated and controlled before the other driving roller. Stopping the driving roller of the part,
A method for preventing paper breakage at the time of a power failure in a shaftless rotary press characterized by comprising:   In the case where a plurality of printing units are provided in the printing unit, after the power failure is detected, the driving rollers are synchronously rotated by using regenerative power of each motor that rotates each driving roller of the printing unit. The method of preventing paper breakage at the time of a power failure in the shaftless rotary press according to claim 1, wherein deceleration control is performed. The method for preventing a paper break at the time of a power failure in a shaftless rotary press according to claim 1 or 2, further comprising a step of cutting the running paper in the vicinity of the former of the folding portion simultaneously with the detection of a power failure.   A variable resistor for supplying the regenerative electric power is prepared, and the rotational value of the drive roller is adjusted to be decelerated by adjusting a resistance value of the variable resistor based on a command from the control device. Item 4. A method for preventing paper breakage at the time of a power failure in the shaftless rotary press according to any one of Items 1 to 3.   Information relating to the running paper such as the number of running paper and the rotation speed of the driving roller of the printing unit during normal operation and the stop time of the driving roller of the printing unit are input to the control device in advance. The control device determines a stop time of the driving roller of the printing unit according to the input content, and performs a reduction adjustment of the rotational speed of the driving roller of the printing unit. A method for preventing paper breakage at the time of a power failure in the shaftless rotary press according to any one of the above. The paper feeding unit, the printing unit, the rail frame unit, and the folding unit are provided, and the driving roller provided in each unit is controlled to apply a certain tension to the running paper from the winding paper of the paper feeding unit. In a shaftless rotary press that feeds traveling paper to a printing unit, performs predetermined printing, passes the rail frame unit to pass the traveling paper in a predetermined stacking order, and then cuts and folds the newspaper into newspaper size at the folding unit A device for preventing paper breakage at the time of a power failure,
A power failure detection unit that detects a commercial power failure,
A backup power supply for control that supplies power to the control device when the power failure detection unit outputs a detection signal;
A motor for rotating a driving roller of the printing unit;
An inverter that outputs a speed command to the motor;
A variable resistor which is provided in the inverter and reduces the rotational speed of the motor by discharging resistance by flowing regenerative power of the motor;
When the power failure detection unit detects a power failure, the mode is switched from the normal operation mode to the power failure operation mode, and the other driving rollers except the driving roller of the printing unit are disconnected from the control system, and each of the variable resistors A control device that outputs a command to adjust the resistance value of the driving roller and performs deceleration control of the driving roller, and stops the driving roller before the other driving roller;
An apparatus for preventing paper breakage at the time of a power failure in a shaftless rotary press characterized by comprising:   In the case where a plurality of printing units are provided in the printing unit, after the power failure is detected, the control device uses the regenerative electric power of each motor that rotates each driving roller of the printing unit to turn the driving roller on. The apparatus for preventing a paper breakage at the time of a power failure in a shaftless rotary press according to claim 6, wherein a command for adjusting the resistance value of each of the variable resistors so as to rotate synchronously is output. A cutting means for cutting the running paper is provided between the former of the folding portion and the saw drum and the folding drum, and when the power failure detection unit detects a power failure, the cutting means is driven to cut the running paper. An apparatus for preventing paper breakage at the time of a power failure in a shaftless rotary press according to claim 6 or 7.

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