JP4601753B2 - Drive mechanism of perforation device for rotary printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a driving mechanism for driving a perforation device used in a rotary printing press such as an offset rotary printing press.
[0002]
[Background]
An offset rotary printing press includes a rotary printing unit that prints a pattern on a web (continuous paper), a drying unit that dries the web printed by the rotary printing press unit with warm air, and a cooling unit that cools the dried web. And a folding unit that bends the web. In these printing press components, the driving force is transmitted from the main motor via the transmission shaft.
A perforation device is disposed between the cooling unit and the folding unit, and the perforation device forms a perforation at a predetermined position of the web (pattern).
[0003]
In the perforation device, the rotary drum of the sewing machine blade cylinder and the sewing machine blade receiving cylinder is connected to a transmission shaft that drives the cooling unit and the folding unit, and transmits the rotational driving force from the transmission shaft to the rotary drum. The gearbox is provided separately.
This gear box is provided with a fine transmission mechanism including gears and other mechanisms in order to match the rotational speed of the plate cylinder of the rotary printing unit.
Further, the perforation device is provided with a fine adjustment mechanism for making the perforation coincide with the pattern position printed by the rotary printing unit.
Furthermore, management of the perforation position with respect to the pattern position is performed visually by an operator.
[0004]
[Problems to be solved by the invention]
However, in a conventional rotary printing press, many mechanical parts such as a gear box and the like are separately provided in the perforation device to drive the perforation device, and a fine adjustment mechanism for the perforation position is provided in the perforation device. Required for perforation devices.
Furthermore, in the conventional perforation device, a large amount of work is required when additionally arranging the perforation device in the existing machine in order to drive the cooling machine and the folding machine part through the transmission shaft. There is a problem that a lot of days and labor are consumed.
[0005]
In addition, since the web passes through the drying section and the cooling section after printing in the rotary printing unit, the web tension is constantly fluctuated during that time due to a sudden temperature change or hot air. Will do.
For this reason, in the perforation device, the rotating body is driven to rotate in synchronization with the plate cylinder, but the phase of the printed pattern on the web and the perforation changes as the web tension changes. The labor of the operator is great.
[0006]
An object of the present invention is to provide a drive mechanism for a perforation device for a rotary printing press that can reduce the number of parts and can easily incorporate the perforation device into a rotary printing press.
[0007]
[Means for Solving the Problems]
Therefore, the present invention intends to achieve the object by directly rotating and driving the rotary drum of the perforation device with a servo motor and controlling the servo motor to synchronize with the web fed from the rotary printing unit. .
[0008]
Specifically, the drive mechanism of the perforation device for a rotary printing press according to claim 1 of the present invention is:
A drive mechanism for driving the rotary cylinder in a perforation device for a rotary printing press that forms a perforation by a rotary cylinder on a web printed with a predetermined printing phase from a rotary printing unit,
A servo motor that rotationally drives the rotating drum;
A reference detector for detecting the web speed and printing phase;
A mark sensor for detecting a specific mark formed by the pattern or the rotary printing unit;
At the time of initial setting, based on a detection signal detected by the reference detector and a detection signal from a motor encoder that detects a rotation angle and a rotation speed of the servo motor, the rotary cylinder is sent from the web printing unit, The rotation drive of the servo motor is controlled so as to synchronize. During normal control, a predetermined pattern or a specific mark when the perforation position is correct with respect to the pattern is detected by the mark sensor. The rotation angle signal from the detector is stored as the rotation angle of the rotating drum, the stored rotation angle is set as a reference angle, and the rotation angle of the rotating drum when a predetermined pattern or specific mark is detected thereafter. the difference between the reference angle stored in advance and the rotation angle signal from the stored reference detector determined, a determination is made if this difference is within the tolerance provided in advance as And control means for controlling the calculated command signal to fall within the allowable value is added to the command signal is phase-locked if the difference is out of tolerance,
It is provided with.
[0009]
The drive mechanism of the perforation device for a rotary printing press according to claim 2 of the present invention,
The reference detector according to claim 1 is configured to detect a rotation speed and a rotation phase of a plate cylinder provided in the rotary printing unit.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the rotary printing press 1 of the present invention is a four-color offset rotary printing press.
The gravure rotary printing machine 1 includes four rotary printing units 22 to 24 arranged in one row, and the web W has a pattern of four colors printed while passing through these rotary printing units 21 to 24. Are printed with a predetermined printing phase.
[0017]
In the rotary printing unit 21, the paper feeding unit 3 and the infeed unit 4 are arranged on the upstream side of the flow of the web W, and the drying unit 5 and the cooling unit 6 are arranged on the downstream side of the flow of the rotary printing unit 24. The EPC device 7, the perforation device 8, and the folding unit 9 are arranged according to the web flow direction.
The rotary printing units 21 to 24, the paper feeding unit 3, the infeed unit 4, the drying unit 5, the cooling unit 6, the EPC device 7, the perforation device 8, and the folding unit 9 are connected to the main motor via the transmission shaft 1A. 1B, respectively.
[0018]
The folding unit 9 includes a folding introduction unit 9A that adjusts the web W on which the perforation is formed by the perforation device 8, and a folding unit main body 9B that folds the web.
The folding unit main body 9B includes a plurality of folding cylinders 9C for folding the web, and the folding cylinders 9C are connected to the transmission shaft 1A.
[0019]
Each of the rotary printing units 21 to 24 includes a plate cylinder 2A for printing a pattern on the web W, and a blanket cylinder 2B disposed opposite to the plate cylinder 2A with the web W interposed therebetween. The plate cylinder 2A and the blanket cylinder 2B are connected to the transmission shaft 1A and are rotationally driven by a driving force from the main motor 1B.
The rotary printing unit 24 is provided with a reference detector 11 that detects the speed of the web W and the printing phase from the rotation speed and rotation phase of the plate cylinder 2A.
The reference detector 11 is attached to the rotating shaft of the plate cylinder 2A and other locations, and has a well-known structure for detecting the rotation speed and rotation phase of the plate cylinder 2A.
[0020]
The drying unit 5 includes a hot air generator 5 </ b> A for drying the web W on which a pattern is printed by the rotary printing units 21 to 24.
Specific structures of the cooling unit 6, the EPC device 7, and the perforation device 8 are shown in FIG.
In FIG. 2, the cooling unit 6 includes a plurality of cooling rollers 6A, and the web W dried by the drying unit 5 contacts the cooling rollers 6A, thereby cooling the web W.
The EPC device 7 is a web straightening device that corrects the web W to an original correct trajectory by swinging the web W in a direction (web width direction) perpendicular to the flow direction by two rolls 7A.
[0021]
The perforation device 8 is disposed on the upstream side and the downstream side of the sewing machine blade cylinder 8A and the sewing machine blade receiving cylinder 8B. A plurality of guide rollers 8C and a drive mechanism 10 that rotationally drives the sewing machine blade cylinder 8A and the sewing machine blade receiving cylinder 8B are provided. In the present embodiment, when the perforation device 8 is not used, the web W is sent directly from the EPC device 7 to the folding unit 9 via the guide roller 8D.
[0022]
The sewing machine blade cylinder 8A has a structure in which a sewing machine blade (not shown) is attached to the same cylinder body as the plate cylinder 2A and the folding cylinder 9A.
The sewing machine blade is attached to the same plate as the plate cylinder 2A or a back-baked plate with an adhesive or the like, and this plate is attached to the cylinder body.
As for the sewing machine blade receiving cylinder 8B, the receiving part (not shown) which receives a sewing machine blade by the same cylinder main body as the printing cylinder 2A and the folding cylinder 9A is formed in the surrounding surface.
In the present embodiment, the sewing machine blade cylinder 8A and the sewing machine blade receiving cylinder 8B together constitute a rotary cylinder that forms a perforation.
[0023]
In FIG. 3, the sewing machine blade barrel 8 </ b> A includes a rotation drive shaft 8 </ b> E, and this rotation drive shaft 8 </ b> E is connected to the servo motor 12.
The sewing machine blade receiving cylinder 8B includes a rotational drive shaft 8F, and the rotational drive shaft 8F is connected to the rotational drive shaft 8E. Therefore, when the servo motor 12 is rotationally driven, this driving force is transmitted to the sewing machine blade cylinder 8A and the machine blade receiving cylinder 8B, and a perforation W1 is formed in the web W sandwiched between these cylinders.
[0024]
In FIG. 2, the drive mechanism 10 of the perforation device includes a reference detector 11, a servo motor 12, and a perforation blade cylinder 8 </ b> A sent from the rotary printing units 21 to 24 based on detection signals detected by the reference detector 11. And a control means 13 for controlling the rotational drive of the servo motor 12 so as to synchronize with the web W.
The control means 13 controls the drive of the servo motor 12 so that the perforation is formed at an appropriate position in response to a signal from the mark sensor 14 for detecting a pattern or a specific mark on the web W and the mark sensor 14. The circuit 15 is provided.
[0025]
The mark sensor 14 is disposed in the vicinity of the guide roller 8C disposed on the upstream side of the sewing machine blade barrel 8A, and irradiates light to the web W contacting the guide roller 8C and detects light reflected from the web W. Thus, it is detected whether or not a pattern or a specific mark is formed on the web W.
[0026]
A specific configuration of the control circuit 15 is shown in FIG. In FIG. 4, the control circuit 15 includes a motor encoder 12 </ b> A that detects the rotation angle and rotation speed of the servo motor 12, and a storage unit 16 that stores information from the motor encoder 12 < / b> A , the reference detector 11, and the mark sensor 14. A control unit 17 for calculating a position command signal by processing the information stored in the storage unit 16 and signals from the motor encoder 12A and the reference detector 11, and a position command signal from the control unit 17; The servo controller 18 receives and controls the drive of the servo motor 12, and a servo amplifier 19 that drives the servo motor 12 by converting a signal from the servo controller 18 into a drive signal. The motor encoder 12 </ b> A is attached to the rotation shaft of the servo motor 12 and has a known structure for detecting the rotation speed and rotation phase of the servo motor 12.
[0027]
The storage unit 16 is configured to detect the detection angle (initial reference phase) of the reference detector 11 when the gap portion (not shown) of the sewing machine blade cylinder 8A and the gap portion (not shown) of the plate cylinder 2A coincide on the web W. Angle) and the rotational phase angle (initial phase angle) of the sewing machine blade cylinder 8A, and the detected position of the predetermined pattern or specific mark when the correct perforation position is obtained with respect to the pattern. Store as 8A rotation angle.
The initial reference phase angle and the initial phase angle are initial settings that are performed only when the rotary printing press 1 is installed.
An interface circuit 20 </ b> A is provided between the storage unit 16 and the mark sensor 14.
[0028]
The control unit 17 performs initial correction and normal control, and enters an operation standby state when receiving a printing press operation signal from the printing press control circuit 100.
When printing is started, the reference detector 11 outputs a rotation angle signal corresponding to the printing phase, and the control unit 17 rotates every predetermined time (within several msec) determined in advance from this signal. A change amount of the angle is obtained, and a position command signal (reference position command) is sent to the servo controller 18 according to the change amount.
[0029]
Here, since the servo motor 12 is driven and controlled in accordance with the amount of change of the reference detector 11, a time delay of a predetermined time (within a few msec) always occurs. Since the rate of change is very large compared to this time, an inconvenient error does not occur when the perforation device 8 is driven.
An interface circuit 20B is provided between the control unit 17 and the reference detector 11. An interface circuit 20C is provided between the control unit 17 and the printing press control circuit 100.
[0030]
The initial correction in the control unit 17 is performed when a command for a preparation switch (not shown) is received, and the reference phase difference that is the difference between the initial reference phase angle and the initial phase angle and the preparation switch are operated. A position command signal for driving the servo motor 12 is sent to the servo controller 18 so that the difference (phase difference) between the detection angle detected by the reference detector 11 and the detection angle detected by the motor encoder 12A sometimes coincides. .
With the completion of the initial correction, the preparation for printing when using the perforation device 8 is completed.
[0031]
In the normal control by the control unit 17, the rotation angle stored in the storage unit 16 is set as the reference angle α, and thereafter stored in advance as the rotation angle β of the sewing machine blade barrel 8A when a predetermined picture or specific mark is detected. The difference D with respect to the reference angle α is obtained, and it is determined whether the difference D is within a predetermined allowable value. If the difference D is out of the allowable value, the difference D is within the allowable value. The command signal calculated so as to be within the range is sent to the servo controller 18 as a position command signal whose phase is synchronized.
[0032]
That is, a predetermined pattern or a specific mark when the perforation position is correct with respect to the pattern is detected by the mark sensor 14, and the rotation angle signal of the reference detector 11 at this time is stored as the perforation position reference angle α. 16 to store.
Thereafter, the rotation angle signal of the reference detector 11 when a predetermined pattern or specific mark is detected is a perforation phase angle β, and the phase difference between the perforation phase angle β and the perforation reference angle α is D. (D = α-β).
A signal is sent to the servo controller 18 so that the phase difference D falls within a predetermined range (“allowable lower limit” ≦ D ≦ “allowable upper limit”).
Here, the “allowable lower limit” and the “allowable upper limit” are appropriately set according to various conditions such as the material of the web W, the width dimension, and the printing phase.
[0033]
When the phase difference D is not within the predetermined range, the position command signal is sent to the servo controller 18 by adding the signal of the phase difference D to the reference position command.
The servo controller 18 sends a drive signal to the servo amplifier 19 based on the correction signal, and the servo amplifier 19 drives the servo motor 11 based on the drive signal, and the rotation angle per unit time according to the position command signal. The change is applied to the sewing machine blade cylinder 8A and the sewing machine blade receiving cylinder 8B.
[0034]
According to this embodiment, there are the following effects.
(1) Drive the sewing machine blade cylinder 8A in the perforation device 8 that forms the perforation by the machine blade cylinder 8A and the machine blade receiving cylinder 8B on the web W on which the pattern is printed from the rotary printing units 21 to 24 with a predetermined printing phase. A driving mechanism 10 for rotating the sewing machine blade cylinder 8A, a reference detector 11 for detecting the speed and printing phase of the web W, and a detection signal detected by the reference detector 11. On the basis of this, the sewing machine blade cylinder 8A is provided with the control means 13 for controlling the rotational drive of the servo motor 12 so as to synchronize with the web W sent from the rotary printing units 21 to 24. Since the servo motor 12 is directly driven, it is not necessary to separately provide a gear box connected to the main motor 1B. Further, the servo motor 12 is connected to the reference detector 11. Having driven controlled in the fine control unit 13, it is not necessary to provide a fine adjustment mechanism of the perforation position consisting of the gear mechanism. Therefore, in this embodiment, the number of mechanical parts is reduced, and the number of parts can be reduced.
[0035]
Furthermore, (2) since the transmission shaft 1A connected to the main motor 1B is not used as the rotational drive source of the perforation blade body 8A, the transmission shaft 1A is transmitted to the sewing blade body 8A when the perforation device 8 is installed. Work to install a gear mechanism is not required.
Therefore, when the perforation device 8 is additionally arranged in the existing machine, the installation work can be easily performed with a small number of days and labor.
[0036]
Further, since the perforation device 8 is arranged on the downstream side of the cooling unit 6 that cools the web W on which the pattern is printed by the rotary printing units 21 to 24, the web W on which the pattern is printed by the rotary printing units 21 to 24. It is possible that the web tension fluctuates due to a sudden temperature change.
However, (3) in this embodiment, the control means 13 controls the mark sensor 14 that detects a pattern or a specific mark and the servo so that the perforation is formed at an appropriate position in response to a signal from the mark sensor 14. Since the control circuit 15 that drives and controls the motor 12 is provided, the relative position between the printed pattern and the perforation is always managed, and it is not necessary for the operator to visually manage the position of the pattern. Therefore, the operator is freed from complicated work, and the work can be rationalized.
[0037]
Further, (4) the control circuit 15 stores the detection position of the predetermined pattern or the specific mark when the perforation position is correct with respect to the pattern as the rotation angle of the sewing blade body 8A, and this stored rotation angle. Is determined as a reference angle α, and thereafter, a difference D between the rotation angle β of the sewing machine blade barrel 8A when a predetermined pattern or a specific mark is detected and the reference angle α stored in advance is obtained. It is determined whether it is within the set allowable value. If the difference D is out of the allowable value, the command signal calculated so as to be within the allowable value is added to the phase-synchronized command signal. Since the control structure is adopted, the rotation angle of the sewing machine blade cylinder 8A for directly forming the perforation is determined in determining the difference between the original correct position with respect to the pattern of the perforation and the actual position. Since it was used, the control means 13 Ri can be perforated to form always the correct position.
[0038]
(5) The detection angle (initial reference phase angle) of the reference detector 11 when the gap portion of the sewing machine blade cylinder 8A and the gap portion of the plate cylinder 2A coincide on the web W, and the rotation of the sewing machine blade cylinder 8A. The phase angle (initial phase angle) is stored in the storage unit 16, and is detected by the reference detector 11 when the reference phase difference, which is the difference between the initial reference phase angle and the initial phase angle, and the preparation switch is operated. The position command signal for driving the servo motor 12 is sent from the control unit 17 to the servo controller 18 so that the difference (phase difference) between the detected angle and the detected angle detected by the motor encoder 12A matches. Even when the perforation device 8 is additionally installed, the initial correction of the perforation device 8 can be facilitated.
[0039]
Further, (6) the reference detector 11 is configured to detect the rotational speed and the rotational phase of the plate cylinder 2A provided in the rotary printing unit 24, so that the pattern printing position of the web W can be accurately recognized. Therefore, the position where the perforation position is formed with respect to the pattern can be accurately controlled.
[0040]
In addition, this invention is not limited to the said embodiment, As long as the objective of this invention can be achieved, the modification as shown below is also included.
For example, in the present embodiment, the reference detector 11 is provided in the plate cylinder 2A of the rotary printing unit 24. However, in the present invention, the reference detector 11 may be provided in the blanket cylinder 2B of the rotary printing unit 24. The reference detector 11 may be provided in the plate cylinder 2A or the blanket cylinder 2B of the other rotary printing units 21 to 23, or as shown in the imaginary line in FIG. A detector 11 may be provided.
In short, as long as the web speed and the printing phase of the web W can be detected by the reference detector 11, the structure and the mounting position are not limited.
[0041]
Further, only one rotary printing unit 21 to 24 may be provided.
Furthermore, the installation position of the perforation device 8 is not limited between the perforation device 8 and the drying unit 5 as in the above embodiment.
In the present invention, it is not always necessary to provide the mark sensor 14. The circuit configuration of the control means 13 in this case is as shown in FIG. In this case, instead of providing the mark sensor, the position of the pattern or the specific mark may be stored in the storage unit 16 in relation to the progress position of the web W.
Further, the rotary drum is not limited to the sewing machine blade cylinder 8A and the sewing machine blade receiving cylinder 8B, and may be a guide roller 8C.
[0042]
【The invention's effect】
As described above, according to the drive mechanism of the perforation device for a rotary printing press of the present invention, the servo motor that rotationally drives the rotary cylinder, the reference detector that detects the speed and the printing phase of the web, And a control means for controlling the rotational drive of the servo motor so that the rotary drum is synchronized with the web sent from the rotary printing unit based on the detection signal detected by the reference detector. Therefore, since the rotary drum is directly driven by the servo motor, it is not necessary to separately provide a gear box connected to the main motor, and the servo motor is driven and controlled by the reference detector and the control means. Since it is not necessary to provide a perforation position fine adjustment mechanism comprising a mechanism, the number of mechanical parts is reduced, and the number of parts is reduced.
Moreover, when installing the perforation device, it is not necessary to install a gear mechanism for transmitting the transmission shaft to the rotating drum, so when adding a perforation device to an existing machine, it takes less days and effort. Installation work can be done easily.
[0043]
Furthermore, a mark sensor that is disposed downstream of a cooling unit that cools the web on which the pattern is printed by the rotary printing unit, and that detects the specific mark formed by the pattern or the rotary printing unit, And a control circuit that drives and controls the servomotor so that the perforation is formed at an appropriate position in response to a signal from the mark sensor, the control circuit is configured so that the perforation is formed at an appropriate position. Since the servomotor is driven and controlled as described above, the relative position between the printed pattern and the perforation is always managed, and the operator does not need to visually manage the pattern position.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating an entire rotary printing press to which a drive mechanism of a perforation device according to an embodiment of the present invention is applied.
FIG. 2 is a schematic configuration diagram showing a main part of the rotary printing press.
FIG. 3 is a schematic perspective view showing a main part of the perforation device.
FIG. 4 is a circuit diagram showing a drive mechanism according to the embodiment.
FIG. 5 is a circuit diagram showing a drive mechanism according to a modification of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotary printing machine 2A Plate cylinder 5 Drying part 8 Perforation apparatus 8A Sewing blade cylinder (rotary cylinder)
8B Sewing blade receiving drum (rotating drum)
9 Folding machine part 10 Drive mechanism 11 Reference detector 12 Servo motor 13 Control means 14 Mark sensor 15 Control circuits 21 to 24 Rotary printing unit W Web

Claims (2)

A drive mechanism for driving the rotary cylinder in a perforation device for a rotary printing press that forms a perforation by a rotary cylinder on a web printed with a predetermined printing phase from a rotary printing unit,
A servo motor that rotationally drives the rotating drum;
A reference detector for detecting the web speed and printing phase;
A mark sensor for detecting a specific mark formed by the pattern or the rotary printing unit;
At the time of initial setting, based on a detection signal detected by the reference detector and a detection signal from a motor encoder that detects a rotation angle and a rotation speed of the servo motor, the rotary cylinder is sent from the web printing unit, The rotation drive of the servo motor is controlled so as to synchronize. During normal control, a predetermined pattern or a specific mark when the perforation position is correct with respect to the pattern is detected by the mark sensor. The rotation angle signal from the detector is stored as the rotation angle of the rotating drum, the stored rotation angle is set as a reference angle, and the rotation angle of the rotating drum when a predetermined pattern or specific mark is detected thereafter. the difference between the reference angle stored in advance and the rotation angle signal from the stored reference detector determined, a determination is made if this difference is within the tolerance provided in advance as And control means for controlling the calculated command signal to fall within the allowable value is added to the command signal is phase-locked if the difference is out of tolerance,
A drive mechanism for a perforation device for a rotary printing press.   2. The driving mechanism of a perforation device for a rotary printing press according to claim 1, wherein the reference detector detects a rotational speed and a rotational phase of a plate cylinder provided in the rotary printing unit. Drive mechanism for perforation device for printing press.

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