JP3853468B2 - Plate fog prevention device and gravure printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of gravure printing. More particularly, the present invention relates to a plate fog prevention apparatus that promotes drying of excess ink on a plate cylinder surface in a gravure printing machine to prevent plate fog. The present invention also relates to a gravure printing machine provided with the plate fog prevention device.
[0002]
[Prior art]
In the printing unit, after gravure printing plate is supplied with ink on the plate surface, unnecessary ink is scraped off by a doctor blade. However, it is difficult to completely remove the ink, and extra ink remains on the non-image area of the gravure printing plate although it is a very thin film. Many inks have good drying properties, and the ink remaining in this non-image area is dried to such an extent that it does not transfer to the printing paper in a short time from when it is scraped off by the doctor blade to the position where it contacts the printing paper. . However, due to incompatibility of doctor settings, or when the non-image area of the printing plate tends to hold ink, the amount of ink remaining increases or the progress of drying may be insufficient depending on the type of ink. As a result, a “plate fog” occurs in which the non-image area of the printed material is soiled by excess ink.
[0003]
In order to prevent this plate fogging, the air blowing from the air blowing nozzle is controlled so that the air blows only on the non-image area of the gravure printing plate, and the drying of the ink remaining on the non-image area is promoted. Is called. For example, in Japanese Patent Laid-Open No. 63-227341, an air blowing nozzle that opens to the plate cylinder surface is attached to the tip of a safety bar of a conventional gravure printing machine between a doctor blade and an impression cylinder. Plate fog prevention with an air blower pipe, and a pattern detector on the plate cylinder that detects the pattern part of the plate cylinder surface and controls the air blown from the air blower pipe according to the signal from the detector. An apparatus is described.
[0004]
[Problems to be solved by the invention]
The air blow control in such a plate fog prevention device has an electromagnetic valve provided between the air blow nozzle and the air blow pipe, and the air blow from the air blow nozzle is controlled by opening and closing the solenoid valve. However, since the responsiveness of the solenoid valve is poor compared to the rotational speed of the gravure printing plate in the printing press, this is a limitation when the printing speed is increased. In addition, as the printing speed increases, the air between the plate cover and the cell part is poor, and air is not applied to the plate cover part (non-image area) or air is applied to the cell area (image area). May occur. Furthermore, when the electromagnetic valve is used for such a purpose, the rotational speed of the gravure printing plate and the opening / closing speed of the electromagnetic valve coincide with each other, but the rotational speed of the gravure printing plate is several hundreds of revolutions / minute. The endurance limit of the solenoid valve is reached within (for example, several days), and maintenance such as replacement of the solenoid valve must be frequently performed.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a plate fog prevention device that has good responsiveness, good air leakage, and can prevent plate fog well. Another object of the present invention is to provide a gravure printing machine equipped with the plate fog prevention device.
[0006]
[Means for Solving the Problems]
The above object is achieved by the present invention described below. That is, the present invention provides a “plate surface blowing portion, an air opening / closing means, and a rotation detecting means, wherein the plate surface blowing portion is provided with a blowing nozzle for blowing air to the plate surface of the gravure printing plate, The means uses a combination of first and second discs having an opening through which air flows and a non-opening through which air flow is blocked, and the first disc allows the non-image portion of the gravure printing plate to be used. The air supply port for blowing air is opened and closed, and the second disk opens and closes the air discharge port for stopping the air blowing to the image line portion of the gravure printing plate . When one is “open”, the other is “closed”, and the other is “closed”, and the disk is rotated in synchronization with the plate rotation signal to open and close the air flow supplied to the plate surface blowing unit. And do the above Detecting means outputs said plate rotating signal by detecting the rotation of the gravure printing plate, a plate fogging prevention device ". According to the present invention, the rotation detecting means detects the rotation of the gravure printing plate and outputs a plate rotation signal, and the air opening / closing means has a first opening that passes the air flow and a non-opening that blocks the air flow. And the second two discs are used in combination, the first disc opens and closes the air supply port for blowing air to the non-image area of the gravure printing plate, and the second disc uses the gravure printing plate. Open and close the air outlet to stop the air blowing on the image area, and the opening and closing of these discs is configured so that when one is “open”, the other is “closed” The discs rotate in synchronization with the plate rotation signal to open and close the air flow supplied to the plate surface blowing portion, and the plate surface blowing portion is provided with a blowing nozzle for blowing air to the plate surface of the gravure printing plate. Is The air opening and closing means opens and closes the air flow supplied to the plate surface blowing portion by rotating two disks having an opening through which the air flow passes and a non-opening portion that blocks the air flow in synchronization with the plate rotation signal. The rotation detecting means detects the rotation of the gravure printing plate and outputs a plate rotation signal. As described above, since the air opening / closing means for rotating the two disks in synchronization with the plate rotation signal is used, a responsive plate fog prevention device with good responsiveness, good air leakage and good plate fog prevention is provided. .
[0007]
Further, the present invention provides a gravure printing machine having a plate fog prevention device, wherein the plate fog prevention device has a plate surface blowing portion, an air opening / closing means, and a rotation detecting means, and the plate surface blowing portion includes A first nozzle and a second disk, each having a blow nozzle for blowing air onto a plate surface of a gravure printing plate, the air opening / closing means having an opening through which an air flow passes and a non-opening through which the air flow is blocked. The first disk is used to open and close the air supply port for blowing air to the non-image area of the gravure printing plate , and the second disk is used to blow air to the image area of the gravure printing plate. Open and close the air outlets to stop the opening and closing of the discs.When one of them is `` open '', the other is `` closed ''. input A gravure printing machine that rotates in synchronization with a rotation signal, opens and closes an air flow supplied to the plate surface blowing unit, and the rotation detecting means detects rotation of the gravure printing plate and outputs the plate rotation signal. . According to the plate fog prevention apparatus provided in the gravure printing machine of the present invention, rotation of the gravure printing plate is detected by the rotation detecting means, a plate rotation signal is output, and the air passage and the opening through which the air flow is passed and the air flow The first and second discs having a non-opening portion that cuts off the air are used in combination, and the first disc opens and closes the air supply port for blowing air to the non-image portion of the gravure printing plate. The second disc opens and closes the air outlet for stopping air blowing on the image area of the gravure printing plate . When one disc is open, the other disc is closed. The discs rotate in synchronization with the plate rotation signal to open and close the air flow supplied to the plate surface blowing portion, and the plate surface blowing portion has a gravure printing plate. On the plate A blowing nozzle for blowing air is provided, and the air opening / closing means rotates the two disks having an opening through which the air flow passes and a non-opening through which the air flow is blocked by synchronizing with the plate rotation signal. The air flow supplied to the blow-out portion is opened and closed, and the rotation detecting means detects the rotation of the gravure printing plate and outputs a plate rotation signal. Since the air opening / closing means that rotates the two disks in synchronization with the plate rotation signal is used in this way, the plate fog prevention device provided in the gravure printing machine of the present invention has good responsiveness, good air leakage, and good plate fog. It can be prevented and has good durability. Therefore, a gravure printing machine that can prevent plate fogging and has good maintainability is provided.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described based on embodiments. FIG. 1 is an explanatory diagram showing the configuration of the plate fog prevention apparatus of the present invention. FIG. 1A is an overall view, and FIGS. 1B and 1C are views showing the opening and non-opening of the first disk and the second disk. In FIG. 1, 1 is a gravure printing plate (gravure printing cylinder) in which a printing unit of a gravure printing machine is set, and 2 is a rotation detection that is provided in the printing unit and detects a shaft rotation of the gravure printing plate 1 and outputs a plate rotation signal. Means, 3 is an air opening / closing device, 4 is a servo motor which is a rotation driving means of the air opening / closing device 3, 5 is a driver of the servo motor 4, 6 is a control device of the servo motor 4, and 7 is detecting the shaft rotation of the servo motor 4. A pulse generator for outputting a motor rotation signal, 8 an air supply port of the air switching device 3, 9 an air discharge port of the air switching device 3, 10 an air outlet of the air switching device 3, and 11 an air switching device The first disk, 12 is the second disk of the air switching device 3, 13 is the air chamber, 14 is the air piping, 15 is the plate surface of the gravure printing plate 1 provided in the printing unit Blowing nozzle, 16a for blowing air, 16b is opening in each disc, 17a, 17b are non-opening of each disc.
[0010]
As shown in FIG. 1A, the air opening / closing device 3 has a first disk 11 and a second disk 12. The first disk 11 and the second disk 12 share a rotating shaft, and the rotating shaft is rotationally driven by the servo motor 4. As shown in FIGS. 1B and 1C, the first disk 11 and the second disk 12 have openings 16a and 16b and non-openings 17a and 17b. The air inlet 8 is opened by the opening 16a of the first disk 11 and closed by the non-opening 17a. The air discharge port 9 is opened by the opening 16b of the second disk 12 and closed by the non-opening 17b. The opening and closing of the air supply port 8 by the first disk 11 and the opening and closing of the air discharge port 9 by the second disk 12 are configured so that when one is “open”, the other is “closed”. Is done.
[0011]
When the first disk 11 and the second disk 12 are rotationally driven by the servo motor 4 and the air supply port 8 is “open”, the compressed air supplied from the air supply port 8 is supplied to the air chamber 13. At that time, since the air discharge port 9 is “closed”, the air chamber 13 is filled with compressed air and the pressure of the air chamber 13 rises, and the compressed air is sent from the air outlet 10 to the blowing nozzle 15 via the pipe 14. Is done.
When the first disk 11 and the second disk 12 are driven to rotate by the servo motor 4 and the air supply port 8 is “closed”, the compressed air is not supplied from the air supply port 8 to the air chamber 13. At that time, since the air discharge port 9 is “open”, the compressed air in the air chamber 13 is discharged into the atmosphere from the air discharge port 9, and the pressure of the air chamber 13 rapidly decreases, and the compressed air is sent out from the air outlet 10. Stops.
[0012]
When air is sent in, the blowing nozzle 15 blows air toward the plate surface of the gravure printing plate 1. The blowout nozzle 15 blows air to a linear region parallel to the axial direction of the gravure printing plate 1. The blowout nozzle 15 is supported by a printing unit of a gravure printing machine via a bracket or the like, and is provided at a predetermined position with respect to the gravure printing plate 1. The plate surface blowing portion can be provided with a mechanism for adjusting the position and angle of the blowing nozzle 15, a mechanism for moving the blowing nozzle 15 to the standby position and the operating position, and the like, together with the blowing nozzle 15 and the bracket.
[0013]
The servo motor 4 rotationally drives the first disk 11 and the second disk 12 in synchronization with the rotation of the gravure printing plate 1. The rotation detection means 2 detects the shaft rotation (rotation angle, rotation speed, etc.) of the gravure printing plate 1 and outputs a plate rotation signal. The control device 6 inputs the plate rotation signal, compares it with setting data, and outputs an operation amount. The setting data includes the relationship between the rotation angle of the gravure printing plate 1 and the rotation angles of the first disk 11 and the second disk 12, that is, the positions of the image line portion and non-image line portion of the gravure printing plate 1 and the air supply port. 8 describes the opening and closing timing. As shown in FIG. 1, when the rotation axes of the first disk 11 and the second disk 12 and the rotation axis of the servo motor 4 are directly connected, the setting data includes the rotation angle of the gravure printing plate 1 and the servo motor. 4 is described (described later).
[0014]
A pulse generator 7 is provided on the rotating shaft of the servo motor 4. The pulse generator 7 detects the rotation (rotation angle, rotation speed, etc.) of the servo motor 4 and outputs a motor rotation signal. The motor rotation signal is input by the control device 6 (or driver 5), so that the control device 6 (or driver 5) outputs an operation amount so as to correct the deviation from the setting data (target value). The operation amount output by the control device 6 is for controlling the rotation of the servo motor 4 so that the rotation angle of the gravure printing plate 1 and the rotation angle of the servo motor 4 coincide with the set data. The operation amount is input by the driver 5 of the servo motor 4, and the rotation angle of the servo motor 4 is matched with the setting data.
[0015]
FIG. 2 is a diagram showing an example of setting data describing the relationship between the rotation angle of the gravure printing plate and the rotation angle of the servo motor. FIG. 2 (A) shows the setting data as a graph, and FIG. 2 (B) is a table summarizing the points of the operation. In FIG. 2A, the horizontal axis is the line position (angle) that is the rotation angle of the gravure printing plate 1, and the vertical axis is the servo position (angle) that is the rotation angle of the servo motor 4. In the vertical axis, “A zone” indicates a section in which air is blown onto the plate surface of the gravure printing plate 1, and “B zone” indicates a section in which air blowing to the plate surface of the gravure printing plate 1 is stopped.
[0016]
Description of the setting data for each printing unit, that is, for each servo motor corresponding to each gravure printing plate, as indicated by the broken lines labeled servo (1), servo (2), and servo (3) in FIG. Is done. One point in these broken lines indicates the target value of the servo position (angle) at a certain line position (angle). When one point on these broken lines is in the “A zone”, the one point indicates an operating point where the blowing nozzle 15 is located above the non-image portion of the gravure printing plate 1 and air is blown. Further, when one point in these broken lines is in the “B zone”, the one point is an operating point where the blowing nozzle 15 is located above the image line portion of the gravure printing plate 1 and the blowing of air is stopped. Indicates.
[0017]
In one example shown in FIG. 2A, the “A zone” has a servo angle of 60 ° to 300 °, and the “B zone” has a servo angle of 0 ° to 60 ° and 300 ° to 360 °. The boundary between “A zone” and “B zone” is at a servo angle of 60 ° and a servo angle of 300 °. The broken line attached to the servo (1) exceeds the boundary servo angle 60 ° at the line angle 60 °, and exceeds the boundary servo angle 300 ° at the line angle 300 °. As shown in FIG. 2A, the broken line when the boundary is exceeded rises steeply. That is, the servo angle is changed from 40 ° to 80 ° at the boundary line angle of 60 °, and the servo angle is changed from 280 ° to 320 ° at the boundary line angle of 300 °. Thus, the opening / closing speed of the air opening / closing device 3 can be increased by changing the target value of the servo position (angle) at once.
[0018]
As shown in FIG. 2A, the opening / closing speed is similarly increased for the broken line attached to the servo (2) and the broken line attached to the servo (3).
In addition, opening / closing by each servo motor of servo (1), servo (2), servo (3), that is, the line position (angle) entering the “A zone” beyond the boundary and the “B zone” beyond the boundary. The entering line position (angle) is as shown in the table of FIG. 2B in the example shown here.
[0019]
FIG. 3 is a sectional view showing the structure of the air opening / closing device as seen from the side. FIG. 4 is an explanatory diagram showing the relationship between the openings 16a and 16b of the first disk 11 and the second disk 12 when the air opening / closing device is viewed from the front. 3 and 4, the same parts as those in FIG. 1 are denoted by the same reference numerals. In FIG. 3, 31 is a front side wall body, 32 is a rear side wall body, 33 is an intermediate member, and 34 is a common shaft for the first disk 11 and the second disk 12. Next, the air switching device will be described with reference to FIGS. The main body of the air opening / closing device 3 includes a front side wall 31, a rear side wall 32, and an intermediate member 33 that is closed on both sides by the both side walls and has a cylindrical space inside. The air supply port 8 is provided as a hole communicating with the air chamber 13 in the front wall body 31. The air discharge port 9 is provided as a hole communicating with the air chamber 13 in the rear side wall body 32. The air delivery port 10 is provided as a hole communicating with the air chamber 13 on the side surface of the cylindrical space of the intermediate member 33.
[0020]
The shaft 34 extends forward of the front side wall body 31 so that it can be connected to the rotation drive means (see the servo motor 4 in FIG. 1). The shaft 34 is provided on the front side wall body 31 and the rear side wall body 32 by bearings. It is supported rotatably. The first disk 11 is fixed to the shaft 34 at a position where it is aligned with the inner wall surface of the front side wall 31 on the air chamber 13 side. The second disk 12 is fixed to the shaft 34 at a position where the second disk 12 meets the inner wall surface of the rear side wall body 32 on the air chamber 13 side.
[0021]
As shown in FIGS. 1B and 1C and FIG. 4, the first disk 11 and the second disk 12 are provided with openings 16a and 16b and non-openings 17a and 17b. When the positions of the opening and the air supply port 8 or the air discharge port 9 coincide with each other, the air supply port 8 or the air discharge port 9 is “open”, and the non-opening and the air supply port 8 or the air discharge port 9 are opened. The air supply port 8 or the air discharge port 9 is “closed”. That is, the first disk 11 opens and closes the air supply port 8 between the air supply port 8 and the air chamber 13 by the rotation of the shaft 34, and the second disk rotates the air chamber 13 and the air by rotating the shaft 34. The air outlet 9 is opened and closed between the outlets 9.
The opening and closing of the air supply port 8 by the first disk 11 and the opening and closing of the air discharge port 9 by the second disk 12 are such that when one is “open”, the other is “closed”. Constitute.
[0022]
When the first disk 11 and the second disk 12 are rotationally driven and the air supply port 8 is “open”, the compressed air supplied from the air supply port 8 is supplied to the air chamber 13. At that time, since the air outlet 9 is “closed”, the air chamber 13 is filled with compressed air. The air chamber 13 is provided in the intermediate member 33 and communicates with the air delivery port 10. Therefore, when the pressure in the air chamber 13 increases, compressed air is sent out from the air outlet 10. Further, when the first disk 11 and the second disk 12 are rotationally driven and the air supply port 8 is “closed”, the compressed air is not supplied to the air chamber 13. At that time, since the air discharge port 9 is “open”, the compressed air filling the air chamber 13 is discharged from the air discharge port 9 into the atmosphere. For this reason, the pressure in the air chamber 13 rapidly decreases, and the delivery of compressed air from the air delivery port 10 stops.
[0023]
Note that the rotational drive means (see FIG. 1) for rotationally driving the first disk 11 and the second disk 12 performs the rotational drive based on an external synchronization signal. Therefore, the sending and stopping of the compressed air inside the air chamber 13 at the air delivery port 10 can be controlled by a synchronization signal from the outside.
[0024]
【The invention's effect】
As described above, according to the present invention, there is provided a plate fog prevention device that has good responsiveness, good air leakage, and can prevent plate fog well. Moreover, according to the gravure printing machine provided with the plate fog prevention apparatus of the present invention, a gravure printing machine with good plate fog prevention and good maintainability is provided.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a configuration of a plate fog prevention device of the present invention.
FIG. 2 is a diagram illustrating an example of setting data describing a relationship between a rotation angle of a gravure printing plate and a rotation angle of a servo motor.
FIG. 3 is a cross-sectional view showing the configuration of the air switching device as seen from the side.
FIG. 4 is an explanatory diagram showing a positional relationship between openings of a first disk and a second disk when the air opening / closing device is viewed from the front.
[Explanation of symbols]
1 Gravure printing plate (gravure cylinder)
2 Rotation detection means 3 Air opening / closing device 4 Servo motor 5 Driver 6 Control device 7 Pulse generator 8 Air supply port 9 Air discharge port 10 Air delivery port 11 First disk 12 Second disk 13 Air chamber 14 Piping 15 Blowout nozzle 16a , 16b Opening 17a, 17b Non-opening 31 Front side wall 32 Rear side wall 33 Intermediate member 34 Axis

Claims (2)

A printing plate blowing section, an air opening / closing means, and a rotation detecting means, wherein the printing plate blowing section is provided with a blowing nozzle for blowing air to the printing plate surface of the gravure printing plate; The first and second discs having a passing opening and a non-opening that blocks airflow are used in combination, and the first disc is used to blow air onto the non-image area of the gravure printing plate. The air supply port is opened and closed, and the second disc opens and closes the air discharge port to stop the air blowing on the image area of the gravure printing plate. In this case, the other is “closed”, and the other is “closed”, and the discs are rotated in synchronization with the plate rotation signal to open and close the air flow supplied to the plate surface blowing portion, and the rotation The detection means is gravi By detecting the rotation of the printing plate for outputting the plate rotation signal, plate fogging prevention device, characterized in that. A gravure printing machine comprising a plate fog prevention device, wherein the plate fog prevention device has a plate surface blowing portion, an air opening / closing means, and a rotation detecting means, and the plate surface blowing portion is formed of a gravure printing plate. A blowing nozzle for blowing air to the printing plate is provided, and the air opening / closing means uses a combination of first and second disks having an opening through which an air flow passes and a non-opening through which the air flow is blocked. The first disk opens and closes the air supply port for blowing air to the non-image area of the gravure printing plate , and the second disk stops air blowing to the image line area of the gravure printing plate. Opening and closing the air outlet of the plate, the opening and closing of those discs is configured so that when one is "open", the other is "closed", the plate rotation to input those discs Signal Synchronized rotation opens and closes the air flow supplied to the printing plate outlet portion, said rotation detection means outputs said plate rotating signal by detecting the rotation of the gravure printing plate, it gravure printing machine, characterized in.

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