CN113635658A - Printing pressure control apparatus of printing device and method of controlling printing pressure using the same - Google Patents

Printing pressure control apparatus of printing device and method of controlling printing pressure using the same Download PDF

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Publication number
CN113635658A
CN113635658A CN202110433500.4A CN202110433500A CN113635658A CN 113635658 A CN113635658 A CN 113635658A CN 202110433500 A CN202110433500 A CN 202110433500A CN 113635658 A CN113635658 A CN 113635658A
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CN
China
Prior art keywords
roller
printing
pressing
pressure
control apparatus
Prior art date
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Granted
Application number
CN202110433500.4A
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Chinese (zh)
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CN113635658B (en
Inventor
李承炫
金广泳
权信
禹奎熙
金炅禄
朴平原
金铉泰
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Korea Institute of Machinery and Materials KIMM
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Korea Institute of Machinery and Materials KIMM
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Publication of CN113635658A publication Critical patent/CN113635658A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/18—Impression cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/004—Electric or hydraulic features of drives
    • B41F13/0045—Electric driving devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/008—Mechanical features of drives, e.g. gears, clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0009—Central control units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/10—Constitutive elements of driving devices
    • B41P2213/11—Motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/10—Constitutive elements of driving devices
    • B41P2213/11—Motors
    • B41P2213/124—Electric motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/10—Constitutive elements of driving devices
    • B41P2213/11—Motors
    • B41P2213/124—Electric motors
    • B41P2213/128—Linear electric motors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

In a printing pressure control apparatus for a printing device and a method of controlling a printing pressure using the same, the printing pressure control apparatus is configured to pressurize a printing roller of the printing device to control the printing pressure. The printing pressure control apparatus includes a pressure roller, a backup roller, and a pressure roller support portion. The pressure roller is disposed adjacent to the printing roller and configured to press the printing roller. The backup roll is disposed adjacent to the pressure roll and configured to press the pressure roll to indirectly press the printing roll. The pressing roller supporting portion is configured to rotatably support the pressing roller.

Description

Printing pressure control apparatus of printing device and method of controlling printing pressure using the same
Technical Field
The present disclosure relates to a printing pressure control apparatus for a printing device capable of precisely controlling a printing pressure in real time to print a flexible substrate at a timely and spatially uniform printing pressure, and a method of controlling a printing pressure using the same.
Background
Conventionally, printed electronics technology is commonly used to form patterns of micro or nano dimensions on flexible substrates. Printed electronic device technologies include gravure printing, gravure offset printing, reverse offset printing, and the like. In printed electronics technology, a pattern is formed on a target such as a flexible substrate via a roll-to-roll method, and thus productivity in manufacturing a touch panel, a smart label, a flexible energy device, or the like may be enhanced.
The roll-to-roll printing apparatus for performing the roll-to-roll method includes: a printing roller on which a pattern is formed; a pressure roller that presses the printing roller; and a pressing driver that drives the pressing roller toward the printing roller. Here, the flexible substrate passes between the printing roller and the pressing roller, and then the pressing roller moves toward the printing roller, and thus a pattern is formed on the flexible substrate with a uniform printing pressure. In the above roll-to-roll printing technique, the printing pressure applied to the flexible substrate should be uniformly controlled during the printing process to print a uniform pattern on the flexible substrate.
Further, the above-mentioned printing pressure should be uniformly controlled in space during printing, and should be uniformly controlled in time to improve printing quality. In order to control the printing pressure uniformly in time, a press driver that drives the press roller may be feedback-controlled. Here, the pressurizing force applied to the pressurizing driver may be measured, and then the pressurizing force may be controlled in real time to coincide with a predetermined pressurizing force.
However, when the pressurizing roller is closely attached to the printing roller, the pressurizing force of the pressurizing roller may be mainly applied to both ends of the printing roller in the longitudinal direction of the printing roller, and the pressurizing force thereof may be less applied to the central portion of the printing roller. Therefore, in order to solve the above problem, an additional backup roll may be included to additionally pressurize the central portion of the printing roll, but the backup roll should also be controlled in real time to uniformly pressurize. Then, an additional control device or an additional control method may be required, and the control may be more complicated.
The related prior arts are korean laid-open patent No. 10-2019-0136564 published at 12/10.2019 and korean laid-open patent No. 10-2012-0064930 published at 6/20.2021.
Disclosure of Invention
The present invention has been developed to solve the above-mentioned problems of the related art. The present invention provides a printing pressure control apparatus for a printing device capable of precisely controlling a printing pressure in real time to print a flexible substrate at a timely and spatially uniform printing pressure, and a method of controlling a printing pressure using the same.
According to an exemplary embodiment, the printing pressure control apparatus is configured to pressurize a printing roller of the printing device to control the printing pressure. The printing pressure control apparatus includes a pressure roller, a backup roller, and a pressure roller support portion. The pressure roller is disposed adjacent to the printing roller and configured to press the printing roller. The backup roll is disposed adjacent to the pressure roll and is configured to press the pressure roll to indirectly press the printing roll. The pressing roller supporting portion is configured to rotatably support the pressing roller.
In one example, the printing pressure control apparatus may further include a first pressing portion configured to apply a first pressing force to the pressing roller supporting portion to press the pressing roller against the printing roller.
In one example, the printing pressure control apparatus may further include a second pressing section configured to apply a second pressing force to the backup roller to press the backup roller against the pressing roller.
In one example, the first pressing portion may include a first pressing driver configured to variably apply the first pressing force to the pressing roller supporting portion.
In one example, the first pressing part may further include a second pressing driver configured to additionally apply a pressing force or a pressure reducing force to the pressing roller supporting part, so that an actual pressing force applied from the first pressing driver to the pressing roller supporting part may be the first pressing force.
In one example, the first pressurization drive may include at least one of a servo motor, a pneumatic cylinder, and a hydraulic cylinder. The second pressurization driver may include at least one of a voice coil motor, a linear motor, a solenoid, and a piezoelectric actuator.
In one example, the first pressing part may further include a moving part configured to move the second pressing driver to be spaced apart from the pressing roller supporting part.
In one example, the pressure roller may extend along the printing roller and may be in line contact with the printing roller.
In one example, the support roller may extend along the pressure roller and may be in line contact with the pressure roller.
In one example, the length of the backup roll may be less than the length of the pressure roll.
In one example, a single support roller may be provided at a central portion of the pressure roller, or a plurality of support rollers may be spaced apart from each other.
According to an exemplary embodiment of the present invention, in the method of controlling the printing pressure via pressurizing the printing roller of the printing apparatus, a first pressurizing force applied by the pressurizing roller to the printing roller is predetermined. Here, the pressure roller is disposed adjacent to the printing roller. The second pressing force applied by the backup roller to the pressing roller is predetermined. Here, the support roller is disposed adjacent to the pressure roller. The first pressing force is applied to a pressing roller supporting portion that supports the pressing roller using a first pressing portion, and the second pressing force is applied to the backup roller using a second pressing portion. The backup roller is rotatably supported by the backup roller supporting portion.
In one example, in the predetermining the second pressing force, the second pressing force may be predetermined as a pressing force of the second pressing portion when a difference of the printing pressures in the longitudinal direction of the printing roller is less than a predetermined value.
In one example, when the second pressing force is predetermined, the pressing roller supporting part may be pressed by the first pressing part with the first pressing force. The second pressing portion may variably apply the pressing force to the backup roller when the first pressing portion is pressed with the first pressing force. The printing pressure applied in the longitudinal direction of the printing roller can be measured each time the second pressure section variably applies the pressure force to the backup roller. Based on the measured printing pressure, the pressing force of the second pressing portion may be a second pressing force when a difference in printing pressure in the longitudinal direction of the printing roller is less than a predetermined value.
According to the above-described exemplary embodiments, the second pressing portion and the backup roller are equipped to the press roller supporting portion so that the first pressing portion presses the printing roller via pressing the press roller supporting portion, and at the same time, the second pressing portion presses the backup roller. Therefore, the printing pressure in the longitudinal direction of the printing roller can be maintained spatially uniformly.
Further, the second pressing portion and the backup roller are provided to the pressure roller supporting portion, so that the pressing force applied to the pressure roller supporting portion by the first pressing portion can be feedback-controlled irrespective of the pressure applied to the pressure roller from the backup roller. Therefore, the printing pressure in the longitudinal direction of the printing roller can be maintained uniformly in time.
Drawings
Fig. 1 is a perspective view illustrating a printing pressure control apparatus according to an exemplary embodiment of the present invention.
Fig. 2 is an exploded perspective view illustrating the printing pressure control apparatus of fig. 1.
Fig. 3 is a plan view illustrating the printing pressure control apparatus of fig. 1.
Fig. 4 is a plan view illustrating a printing pressure control apparatus applied to fig. 1.
Fig. 5 is a side view illustrating the printing pressure control apparatus of fig. 1.
Fig. 6 is a flowchart illustrating a method of controlling a printing pressure using the printing pressure control apparatus of fig. 1.
Fig. 7 is a side view illustrating a printing pressure control apparatus according to another exemplary embodiment of the present invention.
Fig. 8 is a perspective view illustrating a printing pressure control apparatus according to still another exemplary embodiment of the present invention.
Fig. 9 is an exploded perspective view illustrating the printing pressure control apparatus of fig. 8.
Reference numerals
1: printing roller
10: pressure roller
20: supporting roll
30. 80: pressure roller supporting part
31. 81: first shaft support part
35. 85: connecting rod
40: a first pressurizing part
41: first pressurizing driver
42: second pressurizing driver
50. 90: a second pressurizing part
55. 95: a second shaft support portion.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention. For ease of description to describe the relationship of one element or feature to another element or feature as shown, spatially relative terms such as "below … … (beneath)", "below … … (below)", "below … … (lower)", "above … … (above)", "above … … (upper)" and the like may be used herein. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the term "lower" may encompass both an orientation of upper and lower. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, element components, and/or groups thereof. Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.
Fig. 1 is a perspective view illustrating a printing pressure control apparatus according to an exemplary embodiment of the present invention. Fig. 2 is an exploded perspective view illustrating the printing pressure control apparatus of fig. 1. Fig. 3 is a plan view illustrating the printing pressure control apparatus of fig. 1.
Referring to fig. 1, a printing pressure control apparatus 100 (hereinafter, a control apparatus) may be attached to a printing device. The pressure roller 10 of the control apparatus 100 is disposed adjacent to the printing roller 1. Although not shown in the drawings, the shaft 3 that supports the printing roller 1 and rotates the printing roller 1 is combined with a frame of a printing apparatus (not shown), and the control apparatus 100 of the present exemplary embodiment is attached to an apparatus frame 5 of the printing apparatus.
For example, the printing apparatus may be an apparatus that prints a pattern or coats a film on a flexible substrate via a roll-to-roll process. The flexible substrate is wound by a supply roll having a roll shape and then unwound to be disposed between the printing roll 1 and the pressing roll 10 of the control apparatus 100. The flexible substrate is printed in a printing device and additional processes are performed, and then may be finally wound by a take-up roll having a roll shape.
The flexible substrate may comprise a flexible material, and may be referred to as a web, on which a pattern or film may be printed or coated. For example, the flexible substrate may be one or a combination of polymer film, fiber, paper, flexible glass, fabric material, and the like, but is not limited thereto.
In the printing roller 1 of the printing apparatus, a fine pattern is concavely formed on the surface of the printing roller 1, and ink is filled with the fine pattern. Then, when the flexible substrate passes between the printing roller 1 and the pressing roller 10, the pressing roller 10 presses the flexible substrate toward the printing roller 1. Thus, the pattern formed on the surface of the printing roller 1 is transferred onto the flexible substrate. However, the above-described printing process may be an example of various printing processes, and thus the control apparatus 100 of the present invention may be applied to various conventional printing processes.
For example, the printing device may be a coating device that prints or coats a pattern on the substrate, and then the pattern may be printed or coated on the substrate as the substrate passes between the printing roller 1 and the pressing roller 10.
Referring to fig. 1 to 3, the control apparatus 100 according to the present exemplary embodiment includes a pressure roller 10, a backup roller 20, a pressure roller support portion 30, a first pressing portion 40, and a second pressing portion 50.
The pressure roller 10 is disposed adjacent to the printing roller 1, and presses the printing roller 1. Here, the pressing roller 10 is disposed and extends along the printing roller 1, and the pressing roller 10 may be in line contact with the printing roller 1. When the flexible substrate passes between the printing roller 1 and the pressing roller 10, the pressing roller 10 presses the flexible substrate toward the printing roller 1. Therefore, the flexible substrate can be printed at an appropriate printing pressure.
The pressing roller 10 may be a driving roller that actively rotates. For example, the pressure roller 10 may be directly or indirectly connected to a driving motor (not shown), and then, when the pressure roller 10 rotates, the printing roller 1 also rotates. Alternatively, the pressing roller 10 may not be connected to the driving motor, and thus the pressing roller 10 may be passively rotated.
The shaft 15 of the pressing roller 10 is supported by the pressing roller supporting portion 30. The pressure roller supporting part 30 may include a pair of first shaft supporting parts 31 and a link 35. The pair of first shaft supporting parts 31 support both ends of the shaft 15 of the pressing roller 10, and the link 35 connects the pair of first shaft supporting parts 31. The first shaft supporting part 31 is rotatably connected with the shaft 15 of the pressing roller 10, and thus supports the pressing roller 10. The link 35 connects the pair of first shaft supporting parts 31, and as shown in the drawing, the link 35 is spaced apart from the pressing roller 10 and arranged along the longitudinal direction of the pressing roller 10. Further, both ends of the link 35 are connected to the pair of first shaft supporting parts 31, respectively.
The first pressing portion 40 is provided at the pressing roller supporting portion 30 and combined therewith. The first pressing portion 40 may be driven by a driving device such as a hydraulic cylinder, and forces the pressing roller support portion 30 to move toward the printing roller 1 or to move opposite to the printing roller 1 by a predetermined range, so that the pressing force applied to the printing roller 1 may be controlled. The first pressing portion 40 will be explained in detail below with reference to fig. 4 and 5.
In the present exemplary embodiment, the backup roller 20 is disposed adjacent to the pressing roller 10, and presses the pressing roller 10 to indirectly press the printing roller 1. Here, the pressure roller 10 is disposed between the printing roller 1 and the backup roller 20, and the backup roller 20 is arranged and extends along the pressure roller 10. Further, the backup roller 20 is in line contact with the pressure roller 10. Thus, as shown, the printing roll 1, the pressure roll 10 and the backup roll 20 extend parallel to each other.
The control device 100 may comprise at least one support roller 20. When two or more support rollers 20 are provided, the support rollers 20 may be spaced apart from each other. However, as shown in the drawing, when only one support roller 20 is provided, the support roller 20 may be provided at a central portion of the pressing roller 10. Here, the center of the pressing roller 10 in the longitudinal direction may be substantially the same as the center of the backup roller 20 in the longitudinal direction.
The length of the support roller 20 is not limited. For example, the length of the supporting roller 20 may be a half or a quarter of the length of the pressing roller 10, but is not limited thereto. Further, the diameter of the backup roller 20 may be substantially equal to or smaller than the diameter of the pressure roller 10, and various changes may be made.
The support roller 20 may operate as a drive roller actively rotated by an arbitrary drive motor, and may be passively rotated by the rotation of the press roller 10.
The backup roller 20 is attached to and supported by the pressure roller support section 30, and is rotated. Both ends of the shaft of the backup roller 20 are respectively and rotatably supported or coupled by a pair of second shaft supporting portions 55, and the second shaft supporting portions 55 are coupled to the second pressing portion 50. The second pressing portion 50 may be a driving device such as a hydraulic cylinder, and then the hydraulic cylinder may be attached or fixed to the upper surface or the lower surface of the link 35 of the pressing roller supporting portion 30. Further, the piston rod of the hydraulic cylinder may be integrally combined with the second shaft support portion 55.
Therefore, the second pressing portion 50 applies a predetermined force to the backup roller 20 so that the backup roller 20 presses the pressing roller 10. For example, the second pressing section 50 applies a pressing force to pull the backup roller 20, and thus the backup roller 20 is pulled toward the pressing roller 10. Therefore, a predetermined pressing force can be applied to the pressing roller 10.
According to the control apparatus 100 described above, when the flexible substrate passes between the printing roller 1 and the pressing roller 10, the first pressing section 40 is operated to cause the pressing roller 10 to press the printing roller 1, and the second pressing section 50 is operated to cause the backup roller 20 to simultaneously press the pressing roller 10. Accordingly, the backup roller 20 pushes the central portion of the pressure roller 10 toward the printing roller 1 in the longitudinal direction, and thus applies the pressing force of the pressure roller 100 to the printing roller 1, particularly at the central portion thereof. Accordingly, the entire area or part of the printing roller 1 can be uniformly attached to the flexible substrate with uniform pressure, and thus printing can be more uniformly performed with improved quality.
In the present exemplary embodiment, the second pressing portion 50 that supports and presses the backup roller 20 is coupled with or fixed to the pressure roller supporting portion 30, not to the frame of the printing apparatus. Therefore, even if the pressing force from the backup roller 20 to the pressing roller 10 is changed, the influence of the entire pressing force applied to the printing roller 1 by the first pressing portion 40 is small. Therefore, even if the pressing force applied to the pressing roller 10 by the backup roller 20 is changed, the pressing force applied to the printing roller 1 in the longitudinal direction of the printing roller 1 can be uniformly controlled by controlling the pressing force applied to the pressing roller supporting portion 30 by the first pressing portion 40.
With regard to the above-described technical features of the present exemplary embodiment, a more detailed description will be made below with reference to fig. 4.
Fig. 4 is a plan view illustrating a printing pressure control apparatus applied to fig. 1.
In fig. 4, "F1 (first pressing force)" is defined as a force applied by the first pressing portion 40 to the pressing roller support portion 30, and "F2 (second pressing force)" is defined as a force applied by the second pressing portion 50 to the backup roller 20.
In the control apparatus 100, the second pressing portion 50 is supported and attached to the link 35 of the pressing roller supporting portion 30. Therefore, when the second pressing portion 50 applies the second pressing force F2 to the supporting roller 20, a repulsive force corresponding to the second pressing force F2 is generated, and the repulsive force is transmitted to the first pressing portion 40. Therefore, the force applied to the printing roller 1 by the first pressing portion 40 via the pressing roller supporting portion 30 may be "F1-F2" (first pressing force-second pressing force).
The second pressing force F2, which is the force applied to the backup roller 20 by the second pressing section 50, is transmitted to the printing roller 1 via the pressing roller 10. Therefore, the force applied to the printing roller 1 by the single first pressing portion 40 and the single second pressing portion 50 is substantially the same as the first pressing force F1, and as shown in fig. 4, there is a pair of first pressing portions 40, and thus the entire force applied to the printing roller 1 is 2 × F1.
Therefore, as shown in the drawing, since the force "F1-F2" transmitted from the first pressing portion 40 via the pressing roller supporting portion 30 is mainly applied, the first printing pressure P1 is generally formed at both ends of the printing roller 1. Further, since the force "F1" transmitted due to the pressurization of the backup roller 20 is mainly applied, the second printing pressure P2 is generally formed at the central portion of the printing roller 1. Therefore, as described below, in the control apparatus 100 according to the present exemplary embodiment, the printing pressure of the printing roller 1 can be uniformly controlled in time and space.
First, with regard to the uniform control of the printing pressure in space, the first pressing force F1 applied by the first pressing portion 40 and the second pressing force F2 applied by the second pressing portion 50 are appropriately controlled so that the printing pressure is uniformly maintained along the entire length of the printing roller 1, where P1 is substantially the same as P2.
For example, under the condition that the length of the printing roller 1 is 1400mm, the length of the pressing roller 10 is 1400mm, the length of the backup roller 20 is 600mm, and the ratio between the first pressing force F1 and the second pressing force F2 is about 4:3, the printing pressure can be uniformly maintained along the entire length of the printing roller 1.
The ratio of the above example may be variously changed according to the length of the support roller 20, the diameter or material of the press roller 10, the diameter or material of the support roller 20, and the like. For example, as the length of the backup roll 20 increases, the force of the second pressure roll F2 may increase, and as the length of the backup roll 20 decreases, the force of the second pressure roll F2 may decrease to create a uniform printing pressure on the printing roll 1.
Secondly, with regard to the uniform control of the printing pressure over time, the final force applied to the printing roller 1 depends only on the first pressurizing force F1. Therefore, when the printing pressure is changed according to time, only the first pressure section 40 needs to be controlled and the second pressure section 50 does not need to be controlled. Here, the first pressurization part 40 is controlled so as to compensate for a change in printing pressure according to time, and thus the printing pressure can be controlled uniformly in time.
Therefore, the target pressurizing forces of the first pressurizing force F1 and the second pressurizing force F2 are predetermined according to the ratio F2/F1 between the first pressurizing force F1 and the second pressurizing force F2, and then even if the printing pressure changes according to time, the first pressurizing force F1 is controlled only through the control of the first pressurizing portion 40, so that the printing pressure can be uniformly controlled.
Fig. 5 is a side view illustrating the printing pressure control apparatus of fig. 1.
Referring to fig. 1, 2, 3 and 5, the first pressurizing portion 40 includes a first pressurizing driver 41 and a second pressurizing driver 42. Alternatively, the first pressurizing portion 40 may include one of the first pressurizing driver 41 and the second pressurizing driver 42. As shown in the drawing, when the first pressing portion 40 includes the first pressing driver 41 and the second pressing driver 42 arranged in parallel, the first pressing force F1 is the sum of the force applied to the pressing roller support portion 30 by the first pressing driver 41 and the force applied to the pressing roller support portion 30 by the second pressing driver 42.
The first pressing driver 41 changes the applied force and applies the force to the pressing roller supporting portion 30. For example, in fig. 5, first pressurizing actuator 41 may be a hydraulic cylinder. Here, the first pressurizing actuator 41 includes a cylinder 411 and a piston rod 412. The cylinder 411 is fixed to the frame 5 of the printing apparatus, and the piston rod 412 is fixed to the pressing roller support portion 30 so that a pressing force or a decompression force can be applied to the printing roller. Here, "applying a pressing force" means operating a hydraulic cylinder to push the pressing roller supporting part 30 toward the printing roller 1, and thus applying a pressing force to the printing roller 1. Further, "applying a decompression force" means that the pressing roller supporting part 30 is retracted and away from the printing roller 1, and thus the pressure applied to the printing roller 1 is reduced.
The first pressurizing driver 41 may be a linear driving device such as a servo motor, a pneumatic cylinder, a hydraulic cylinder, or the like. For example, the first pressing driver 41 may move the pressing roller supporting part 30 in a moving range between several centimeters and several tens of centimeters. The first pressurizing driver 41 has a slower response speed than the second pressurizing driver 42, but has a larger moving range and pressurizing force than the second pressurizing driver 42. Therefore, when the difference between the pressing force actually applied to the printing roller 1 and the target or predetermined pressing force is relatively large, the deviation or difference therebetween can be easily compensated for via the first pressing driver 41.
In contrast, the second pressurizing driver 42 has a faster response speed than the first pressurizing driver 42. For example, the second pressurizing driver 42 may be a driving device such as a voice coil motor, a linear motor, a solenoid, a piezoelectric actuator, or the like. In fig. 5, a Voice Coil Motor (VCM) is shown as an example of the second pressing driver 42, and here, the second pressing driver 42 is provided in parallel with the first pressing driver 41 and between the pressing roller supporting part 30 and the frame 5 of the printing apparatus.
The second pressurizing driver 42 includes a coil 421 and a magnet 422. The coil 421 is fixed to the pressure roller supporting portion 30. The magnet 422 surrounds the coil 421 and is fixed to the frame 5 of the printing apparatus. In the second pressurizing driver 42, the current applied to the coil 421 is controlled to control the distance between the coil 421 and the magnet 422.
The second pressing driver 42 has a relatively shorter movement range than the first pressing driver 41, for example, in a range between several millimeters and several tens of millimeters. However, relatively high frequency disturbances that are difficult to control by the first pressurizing driver 41 can be easily and correctly compensated for by the second pressurizing driver 42.
The control apparatus 100 according to the present exemplary embodiment may further include a pressure measuring portion and a controller so that the pressure roller supporting portion 30 may be pressurized toward the printing roller 1 by the first pressurizing portion 40, and may control the application of the printing pressure to the printing roller 1.
The pressure measuring section includes at least one load cell 71 and 72. As shown in fig. 5, a first load cell 71 is disposed between the first press driver 41 and the press roller supporting part 30, and a second load cell 72 is disposed between the second press driver 42 and the press roller supporting part 30 to measure the pressure or force applied to the press roller supporting part 30 by the first press part 40. Alternatively, the positions of the first load cell 71 and the second load cell 72 may be changed differently. Further, although not shown in the drawings, the control apparatus 100 according to the present exemplary embodiment may further include a third load cell to measure the pressure or force applied to the backup roller 20 by the second pressurization part 50.
A controller (not shown) controls the printing pressure applied to the printing roller 1 through the pressure roller 10 and the backup roller 20. The controller may include software or hardware (e.g., processor, memory, storage, etc.) to perform the functions of the controller. The controller may receive signals regarding the measurement values from the load cells 71 and 72, and may control the operation of each of the first and second pressurization parts 40 and 50.
Fig. 6 is a flowchart illustrating a method of controlling a printing pressure using the printing pressure control apparatus of fig. 1.
Referring to fig. 6, in the method of controlling the printing pressure using the control apparatus 100, a target pressing force or a predetermined pressing force to each of the first pressing force F1 and the second pressing force F2 applied to the printing roller is predetermined (step S10). Here, the first pressing force F1 applied to the printing roller 1 by the first pressing section 40 is predetermined according to variations such as the length, diameter, and material of each of the printing roller 1, the pressing roller 10, and the backup roller 20. Then, the second pressing force F2 applied by the second pressing portion 50 to the backup roller 20 is predetermined to uniformly provide the printing pressure on the printing roller 1 in the longitudinal direction.
In predetermining the first pressurizing force F1, the user may determine the pressurizing force, or the controller may determine the pressurizing force based on a predetermined algorithm. In predetermining the second pressurizing force F2, for a uniform printing pressure, the controller may determine the pressurizing force based on the ratio F2/F1 between the first pressurizing force F1 and the second pressurizing force F2.
Alternatively, instead of providing the ratio F2/F1, the controller may calculate the second pressurizing force F2 based on the following method. First, the first pressing portion 40 is driven to press the pressing roller supporting portion 30 with the first pressing force F1, and thus the printing pressure is applied to the printing roller 1. During the application of the printing pressure to the printing roller 1, the force applied from the second pressing portion 50 to the backup roller 20 is changed (for example, the force is gradually increased or decreased), and then the printing pressure of the printing roller 1 in the longitudinal direction is measured. Then, based on the measured pressure, when the difference in printing pressure in the longitudinal direction of the printing roller 1 is substantially zero or less than a predetermined value, the pressing force of the second pressing portion 50 is determined as a second pressing force F2.
After the target pressing forces of the first pressing force F1 and the second pressing force F2 are predetermined, the first pressing portion 40 and the second pressing portion 50 are controlled based on the target pressing forces, and the first pressing force F1 and the second pressing force F2 are applied to the pressing roller 10 and the backup roller 20, respectively (step S20). Therefore, the printing pressure can be uniformly formed along the longitudinal direction of the printing roller 1.
Then, when printing the flexible substrate, the controller measures the actual pressurizing force applied to the printing roller 1 using the first and second load cells 71 and 725 (step S30), and then feedback-controls the printing pressure based on the measured pressurizing force (step S40).
For example, when the first pressurizing portion 40 includes the first pressurizing driver 41 and the second pressurizing driver 42 as shown in fig. 5, the controller may perform relatively coarse compensation control via the first pressurizing driver 41, and may perform relatively fine compensation control via the second pressurizing driver 42.
As described above, the first pressurizing driver 41 includes a hydraulic cylinder or the like having a relatively slow response speed but a relatively large movement range, and the second pressurizing driver 42 includes a voice coil motor or the like having a relatively small movement range but a relatively fast response speed. Therefore, the controller may compensate in real time the difference between the target pressurizing force of the first pressurizing force F1 and the actually measured pressurizing force of the first pressurizing force F1 via the control of the first pressurizing driver 41 and the second pressurizing driver 42 sequentially or simultaneously. Then, the printing pressure of the printing roller 1 can be controlled uniformly in time.
Fig. 7 is a side view illustrating a printing pressure control apparatus according to another exemplary embodiment of the present invention.
The printing pressure control apparatus 101 according to the present exemplary embodiment is substantially the same as the control apparatus 100 described above, except for the structure of the first pressing portion 40', and therefore the same reference numerals are used for the same elements, and any repetitive explanation will be omitted.
Referring to fig. 7, in the printing pressure control apparatus 101 according to the present exemplary embodiment, the first pressurization part 40' includes a first pressurization driver 41, a second pressurization driver 42, and a moving part that moves the second pressurization driver 42.
The first pressurizing driver 41 and the second pressurizing driver 42 in the present exemplary embodiment are substantially the same as the first pressurizing driver 41 and the second pressurizing driver 42 in the previous exemplary embodiment.
In the present exemplary embodiment, the moving portion moves the second pressurizing driver 42 forward and backward. Here, the moving part may be a ball screw moving device. The moving part includes: a drive motor 43 provided to the frame 5 of the printing apparatus; a screw shaft 44 rotated by the driving motor 43 and having a thread on an outer surface thereof; a ball nut block 45 having a plurality of balls that move inside and along the screw shaft 44 due to the rotation of the screw shaft 44; and a bracket 47 connecting the ball nut block 45 and the second pressurizing driver 42.
In the present exemplary embodiment, the driving motor 43 is driven to move the second pressurizing driver 42 forward or backward in a range corresponding to the length of the screw shaft 44, and thus the control range of the second pressurizing driver 42 can be increased. Further, the second pressurizing driver 42 can be prevented from being damaged when the printing apparatus is repaired or maintained.
For example, the second pressurizing driver 42 may be one of a voice coil motor, a linear motor, a solenoid, a piezoelectric actuator, and the like, which has a relatively short movement range between several millimeters and several centimeters. The pressure roller 10 should be spaced apart or separated from the printing roller 1 when the printing roller 1 or the maintenance control apparatus 100 or the like is replaced. Here, the first pressurizing driver 41 may move about several centimeters or several tens of centimeters, but the second pressurizing driver 42 may be restricted to move correspondingly to the first pressurizing driver 41.
Therefore, the first pressurizing part 40' is equipped as described above so that the second pressurizing driver 42 can be moved enough to correspond to the first pressurizing driver 41. Here, the second pressing driver 42 may be sufficiently spaced apart or separated from the pressing roller supporting part 30 due to the first pressing part 40'.
For example, as shown in fig. 7, when the second pressing driver 42 includes a Voice Coil Motor (VCM) having a coil 421 and a magnet 422, the coil 421 is fixed to the pressing roller supporting part 30 and the magnet 422 is combined with the bracket 47 of the moving part. Here, the driving motor 42 is driven to sufficiently separate the magnet 422 from the coil 421, and then the pressing roller supporting part 30 is sufficiently pulled away or pulled away from the frame 5 of the printing apparatus using the first pressing driver 41.
Fig. 8 is a perspective view illustrating a printing pressure control apparatus according to still another exemplary embodiment of the present invention. Fig. 9 is an exploded perspective view illustrating the printing pressure control apparatus of fig. 8.
The printing pressure control apparatus 200 according to the present exemplary embodiment is substantially the same as the control apparatus 100 described above, except that the pressure roller supporting section 80 and the second pressing section 90, and therefore the same reference numerals are used for the same elements, and any repetitive explanation will be omitted.
Referring to fig. 8 and 9, in the control apparatus 200 according to the present exemplary embodiment, the pressure roller supporting section 80 includes a pair of first shaft supporting sections 81 that support the pressure roller 250 and a link 85 that connects the pair of first shaft supporting sections 81. In the present exemplary embodiment, the link 85 connects the pair of first shaft supporting parts 81 to each other, and the distance between the link 85 and the pressing roller 10 is greater than that in the previous exemplary embodiment in fig. 1 to 5.
Both ends of the shaft of the backup roller 20 are rotatably combined with a pair of second shaft supporting portions 95, and each of the second shaft supporting portions 95 is combined with the second pressing portion 90. For example, the second pressing portion 90 may be a driving device such as a hydraulic cylinder, and the hydraulic cylinder may be fixed to or attached to the upper surface or the lower surface of the link 85 of the pressing roller supporting portion 80.
Therefore, in the present exemplary embodiment, the second pressing portion 90 pushes the backup roller 20 so that the backup roller 20 presses the pressing roller 10. In contrast to the control apparatus 100 in the previous exemplary embodiment in which the second pressing section 50 pulls the backup roller 20 to press the backup roller 20 against the pressing roller 10, in the control apparatus 200 according to the present exemplary embodiment, the second pressing section 50 pushes the backup roller 20 toward the pressing roller 10 so as to provide the pressing force to the pressing roller 10.
Therefore, as explained in the above exemplary embodiment, by providing the backup roller 20 to the pressure roller supporting sections 30 and 80, various structures for the backup roller 20 to press the pressure roller 10 can be designed or applied.
According to the present exemplary embodiment, the second pressing portion and the backup roller are equipped to the press roller supporting portion so that the first pressing portion presses the printing roller via pressing the press roller supporting portion, and at the same time, the second pressing portion presses the backup roller. Therefore, the printing pressure in the longitudinal direction of the printing roller can be maintained spatially uniformly.
Further, the second pressing portion and the backup roller are provided to the pressure roller supporting portion, so that the pressing force applied to the pressure roller supporting portion by the first pressing portion can be feedback-controlled irrespective of the pressing force applied to the pressure roller from the backup roller. Therefore, the printing pressure in the longitudinal direction of the printing roller can be uniformly maintained in time.
Although exemplary embodiments of the present invention have been described, it is understood that the present invention should not be limited to these exemplary embodiments but various changes and modifications can be made by one of ordinary skill in the art within the spirit and scope of the present invention as hereinafter claimed.

Claims (14)

1. A printing pressure control apparatus configured to pressurize a printing roller of a printing device to control a printing pressure, the printing pressure control apparatus comprising:
a pressure roller disposed adjacent to the printing roller and configured to press the printing roller;
a backup roll disposed adjacent to the pressure roll and configured to press the pressure roll to indirectly press the printing roll; and
a pressure roller supporting portion configured to rotatably support the pressure roller,
wherein the backup roller is rotatably supported by the pressure roller supporting portion.
2. The printing pressure control apparatus of claim 1, further comprising:
a first pressing portion configured to apply a first pressing force to the pressing roller supporting portion to press the pressing roller against the printing roller.
3. The printing pressure control apparatus of claim 1, further comprising:
a second pressing section configured to apply a second pressing force to the supporting roller to press the supporting roller against the pressing roller.
4. The printing pressure control apparatus according to claim 2, wherein the first pressing section includes:
a first pressing driver configured to variably apply the first pressing force to the pressing roller supporting portion.
5. The printing pressure control apparatus according to claim 4, wherein the first pressure section further comprises:
a second pressing driver configured to additionally apply a pressing force or a pressure-reducing force to the pressing roller supporting part such that an actual pressing force applied to the pressing roller supporting part from the first pressing driver is the first pressing force.
6. The printing pressure control apparatus of claim 5, wherein the first pressurization driver includes at least one of a servo motor, a pneumatic cylinder, and a hydraulic cylinder,
wherein the second pressurization driver comprises at least one of a voice coil motor, a linear motor, a solenoid, and a piezoelectric actuator.
7. The printing pressure control apparatus according to claim 5, wherein the first pressure section further comprises:
a moving portion configured to move the second pressing driver to be spaced apart from the pressing roller supporting portion.
8. The printing pressure control apparatus of claim 1, wherein the pressure roller extends along the printing roller and is in line contact with the printing roller.
9. The printing pressure control apparatus of claim 1, wherein the support roller extends along the pressure roller and is in line contact with the pressure roller.
10. The printing pressure control apparatus of claim 9, wherein the length of the backup roller is smaller than the length of the pressure roller.
11. The printing pressure control apparatus of claim 10, wherein a single support roller is provided at a central portion of the pressure roller, or a plurality of support rollers are spaced apart from each other.
12. A method of controlling printing pressure via pressurizing a printing roller of a printing device, the method comprising:
predetermining a first pressure force applied to the printing roller by a pressure roller disposed adjacent to the printing roller;
predetermining a second pressing force applied to the pressing roller by a support roller disposed adjacent to the pressing roller; and
applying the first pressing force to a pressing roller supporting portion that supports the pressing roller using a first pressing portion, and applying the second pressing force to the backup roller using a second pressing portion,
wherein the backup roller is rotatably supported by the pressure roller supporting portion.
13. The method according to claim 12, wherein, upon said predetermining said second pressurization force,
the second pressing force is predetermined as a pressing force of the second pressing portion when a difference in printing pressure in the longitudinal direction of the printing roller is smaller than a predetermined value.
14. The method according to claim 13, wherein, upon said predetermining said second pressurization force,
the pressure roller supporting part is pressed by the first pressing part with the first pressing force;
the second pressing portion variably applies the pressing force to the backup roller when the first pressing portion is pressed with the first pressing force;
measuring a printing pressure applied in a longitudinal direction of the printing roller every time the second pressing section variably applies the pressing force to the backup roller; and is
Based on the measured printing pressure, the pressing force of the second pressing portion will be the second pressing force when the difference in the printing pressure in the longitudinal direction of the printing roller is less than a predetermined value.
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