JP4077908B2 - Multicolor printing device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a multicolor printing apparatus that does not require a plate roll, does not require a plate making apparatus, and does not require replacement of a printing roll.
[0002]
[Prior art]
As a plateless printing apparatus, an ink jet printing apparatus has been put into practical use, but this is merely an enlargement of the ink jet printing line printer apparatus.
[0003]
[Problems to be solved by the invention]
The present invention provides a multicolor printing apparatus that does not require a plate roll, does not require a plate making apparatus, and does not require replacement of a printing roll.
[0004]
[Means for Solving the Problems]
The present invention is a multicolor printing apparatus in which a plurality of printing units are installed in a line, and each printing unit is configured to print different colors of ink, and the printing unit applies ink to the entire roll surface. The ink image forming roll to be applied and the tip of a doctor blade are brought into contact with the ink image forming roll to selectively scrape off the ink applied to the ink image forming roll to form an ink image on the roll surface. The ink image forming doctor device, the ink image forming roll of the ink image forming doctor device to which the ink image forming doctor device scrapes the ink, and the web roll to be printed. Ri Do and a compaction roll, the ink imaging doctor apparatus, and a doctor body, taken at the tip of the doctor body A doctor blade, a rigid body that is fixed to the doctor body at a certain distance from the surface opposite to the roll touch surface at the tip of the doctor blade, and one end in the expansion / contraction direction is fixed to the tip of the rigid body. The distance adjusting device has a second end fixedly connected to the tip of the doctor blade or in close contact with the doctor blade. The distance adjusting device includes a micro actuator in which the direction of separation between the doctor and the rigid body is the extension / contraction direction. The actuator drive signal corresponding to the image data causes a local depression on the roll touch surface at the tip of the doctor blade, and the ink applied to the ink image forming roll passes through the depression and is printed. there is provided a multicolor printing apparatus characterized by being configured to print on the substrate takes place transferred to the roll
[0005]
Embodiment
Embodiments of the multicolor printing apparatus of the present invention will be described with reference to the drawings. As shown in FIG. 1A, in the multicolor printing apparatus of this embodiment, for example, four printing units A, B, C, and D are installed in a line, and each printing unit A, B, C, and D is installed. In this case, inks of different colors (magenta, cyan, yellow, black) are overprinted. Further, drying apparatuses E, F, G, and H are provided after each printing unit.
[0006]
As shown in FIG. 1B, each of the printing units described above is immersed in the ink stored in the ink tray 1 with cells corresponding to the most shadow portion corresponding to the solid printing of the gravure plate formed on the entire roll surface. The ink take-in roll 2 that takes in ink into the cell when rotating, a normal doctor 3 that makes a doctor blade contact the ink take-in roll 2 and scrapes off excess ink, and the doctor 3 of the ink take-in roll 2 The ink transfer roll 4 made of a rubber roll that is in close contact with the roll surface from which the ink has been scraped off to transfer the ink in the cells of the ink intake roll 2, and the ink transfer in close contact with the ink transfer roll 4 Made of stainless steel, the ink transferred from the roll 2 to the ink transfer roll 4 is transferred to the entire roll surface in the form of a uniform ultrathin film. The ink image forming roll 5 and the ink image forming roll 5 are brought into contact with the tip of a doctor blade to selectively scrape off the ink applied to the ink image forming roll 5 to form an ink image on the roll surface. A doctor device 6 for forming an ink image, a printing roll (a blanket roll or a rubber roll) 7 to which the ink image is transferred by being in close contact with the roll surface from which ink of the ink image forming roll 5 has been selectively scraped off, It comprises a pressure roll 8 for bringing a web-like printed material W into close contact with the printing roll 7 so that the ink image of the printing roll 7 is transferred to the printed material W.
The ink stored in the ink tray 1 is agitated by a finisher roll 9 that rotates in close contact with the ink intake roll 2.
[0007]
As shown in FIGS. 1C and 1D, the ink image forming doctor device 6 has a doctor body 6a which is a sufficiently rigid body and a thickness of about 0.2 mm attached to the tip of the doctor body 6a. A flexible doctor blade 6b, a rigid body 6c that is provided integrally with the doctor body 6a so as to be opposed to the end surface opposite to the roll touch surface of the doctor blade 6b at a certain interval, and the doctor blade 6b It consists of the space | interval adjustment apparatus 6d which has fixedly connected the front-end | tip part and the rigid body 6c.
In this embodiment, the distance adjusting device 6d needs to be firmly attached to the rigid body 6c, but may be in close contact with the doctor blade 6b. As the doctor blade 6b, a stainless steel ultra-thin plate is usually used, but is not limited thereto. Further, it is better to insert a slit that does not open a gap so as to correspond to each of the micro actuators at the tip of the doctor blade, and to divide the local deflection of the tip of the doctor blade from both sides.
[0008]
The spacing adjusting device 6d is formed by juxtaposing thin plate rectangular micro actuators in which the separating direction of the doctor body 6a and the rigid body 6c is an extension / contraction direction in the longitudinal direction of the doctor. In addition, an electrical signal for extending the micro actuator is sent to create a local recess on the roll touch surface at the tip of the doctor blade 6b, thereby allowing the ink of the ink image forming roll 5 to pass through without being scraped. Cables 6e and 6f for supplying power to the micro actuator are connected to the micro actuator through a gap between the doctor 6a and the rigid body 6c.
The micro actuator of this embodiment employs an electrostrictive actuator such as a piezo element and is laminated in the longitudinal direction of the doctor with an insulating web interposed therebetween, but instead of an electrostrictive actuator such as a piezo element. Alternatively, a giant magnetostrictive element or a photothermally driven microactuator, which is a magnetic material that generates a distortion in a magnetic material when a magnetic field is applied, may be used.
[0009]
An electrical signal for extending the micro actuator is sent to each of the micro actuators of the distance adjusting device 6d so that the entire length of the doctor blade 6b is uniformly bent to several tens of microns toward the roll touch surface.
Then, the doctor blade 6 b is brought into extremely light contact with the ink image forming roll 3. Then, the entire length of the doctor blade 6b is pushed by the reaction force of the ink image forming roll 3, and after all, it is bent evenly to the roll touch surface side by several tens of microns to several tens of microns and is in close contact with the ink image forming roll 3. become.
In this state, the rolls 2, 4, 5, 7, and 8 of each printing unit are rotated. Here, when an electrical signal for extending the micro actuator is sent to each of the micro actuators constituting the interval adjusting device 6d of the ink image forming doctor device 6 of each printing unit. The doctor blade 6b remains in close contact with the ink image forming roll 5 and the ink image forming roll 5 is not formed with cells such as a gravure plate. Are scraped off and printing is not performed.
When the transmission of the electrical signal is interrupted in correspondence with the image data for each of the micro actuators constituting the interval adjusting device 6d, the micro actuators are at the moment when the transmission of the electrical signal is interrupted. In order to reduce the length in order to return to the non-energized crystalline state, the minute local deflection of the roll touch surface of the doctor blade 6b is eliminated, and the ink image forming roll 5 is separated from the ink image forming roll 5 by several microns and the ink from the minute gap. Passes, and printing is performed on the web-shaped substrate W.
The image data to be transmitted to each of all the micro actuators constituting the interval adjusting devices 6d of the printing units A, B, C, and D can be divided into four color colors. Color printing is possible.
[0010]
The present invention is not limited to the above embodiment.
A space adjustment device consisting of a micro actuator that shrinks when an electrical signal is sent, connects a rigid body and a doctor blade, and makes the doctor blade contact an ink image forming roll while the micro actuator is not energized. By rotating the roll and sending an electric signal corresponding to the image data to each micro actuator, the micro actuators are reduced to reduce the size of each of the micro actuators. The image forming roll 5 may be separated from the image forming roll 5 by several microns, and ink may pass through a minute gap so that printing is performed on the web-shaped substrate W.
[0011]
【The invention's effect】
As described above, according to the multicolor printing apparatus of the present invention, plateless printing can be performed and it is extremely economical.
According to the multicolor printing apparatus of the present invention, the conventional gravure printing apparatus can be improved.
According to the multi-color printing apparatus of the present invention, since no plate roll is required, a plate making apparatus is not necessary, thousands of plate rolls per company are unnecessary, and a roll warehouse is not required. There is no need to replace the forming roll.
According to the multicolor printing apparatus of the present invention, the thickness of the micro actuator cannot be made extremely thin at the present time, so that it is suitable for printing a building material film that requires a large amount of ink because of a rough image. If the ultra-small actuator can be made even smaller in the future, it can be widely used for high-definition image printing.
[Brief description of the drawings]
FIG. 1A is a schematic front view according to an embodiment of a multicolor printing apparatus of the present invention, FIG. 1B is a schematic front view according to an embodiment of a printing unit of the present invention, and FIG. The principal part enlarged view which concerns on embodiment of the doctor apparatus for ink image formation of (2), (d) is an Id-Id arrow view of (c).
[Explanation of symbols]
A, B, C, D ... Printing units E, F, G, H ... Drying device 1 ... Ink tray 2 ... Ink intake roll 3 ... Ordinary doctor 4 ... Ink transfer Roll 5 for ink image formation 6 Doctor for ink image formation 6a Doctor body 6b Doctor blade 6c Rigid body 6d Space adjustment device 6e Cable 7 ... Printing roll 8 ... Rolling roll 9 ... Finisher roll W ... Substrate

Claims (1)

A multi-color printing apparatus in which a plurality of printing units are installed in a line, and each printing unit is configured to print different colors of ink, and the printing unit applies ink to the entire roll surface. Ink image formation for forming an ink image on the roll surface by selectively scraping off the ink applied to the ink image forming roll by bringing the tip of a doctor blade into contact with the image forming roll and the ink image forming roll A doctor roll, a printing roll that is in close contact with a roll surface of the ink image forming roll that has been scraped of ink by the ink image forming doctor, and a rolling roll that causes a web-like printed material to be in close contact with the printing roll. de of Tona is, said ink imaging doctor device, and the doctor body, attached to the tip of the doctor body And a rigid body that is fixed to the doctor body at a constant interval on the surface opposite to the roll touch surface at the tip of the doctor blade, and one end in the expansion / contraction direction is fixed to the tip of the rigid body. The space adjustment device is fixedly connected to or closely attached to the tip of the doctor blade, and the space adjustment device includes micro actuators in which the separation direction of the doctor and the rigid body is the expansion / contraction direction, arranged in the longitudinal direction of the doctor. The actuator drive signal corresponding to the image data causes a local depression on the roll touch surface at the tip of the doctor blade, and the ink applied to the ink image forming roll passes through the depression to the printing roll. A multi-color printing apparatus configured to transfer and print on a substrate .

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