CN109514991B - Scraper fixture device, liquid scraping method thereof and alignment film printer - Google Patents
Scraper fixture device, liquid scraping method thereof and alignment film printer Download PDFInfo
- Publication number
- CN109514991B CN109514991B CN201811644604.4A CN201811644604A CN109514991B CN 109514991 B CN109514991 B CN 109514991B CN 201811644604 A CN201811644604 A CN 201811644604A CN 109514991 B CN109514991 B CN 109514991B
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- Prior art keywords
- scraper
- anilox roller
- pressure
- clamp
- different positions
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007790 scraping Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 title claims abstract description 13
- 238000007774 anilox coating Methods 0.000 claims abstract description 268
- 230000007246 mechanism Effects 0.000 claims description 42
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 22
- 238000007606 doctor blade method Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000007639 printing Methods 0.000 abstract description 23
- 238000003825 pressing Methods 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 43
- 230000001276 controlling effect Effects 0.000 description 20
- 239000000758 substrate Substances 0.000 description 11
- 239000011521 glass Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002952 polymeric resin Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
- B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Rotary Presses (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
The invention discloses a scraper clamp device, a liquid scraping method thereof and an alignment film printing machine, wherein the scraper clamp device comprises: the plurality of clamp modules are used for clamping the scraper and are sequentially arranged along the extending direction parallel to the scraper; the pressure sensors are in one-to-one correspondence with the clamp modules and are used for detecting the pressure of the scraper at different positions on the anilox roller; the processing module is connected with the pressure sensors and the clamp modules; the processing module is used for controlling each clamp module to apply pressure to the scraper towards the anilox roller or apply tension to the scraper away from the anilox roller when the pressures of the scraper at different positions on the anilox roller are different, so that the pressures of the scraper at the different positions on the anilox roller are the same. The invention provides a scraper clamp device, a scraping method thereof and an alignment film printer, which are used for solving the problem of uneven alignment solution on the surface of an anilox roller caused by uneven pressing amount of a scraper relative to the anilox roller.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a scraper fixture device, a scraping method thereof and an alignment film printer.
Background
In the field of thin film transistor Liquid crystal display (Thin Film Transistor-Liquid CRYSTAL DISPLAY, TFT-LCD) technology, the alignment film coating process of Liquid crystal includes two kinds of processes: alignment film printing plate coating printing and inkjet printing. At present, many liquid crystal display panels still adopt an alignment film printing plate coating printing technology to form an alignment film.
An alignment film printer implementing an alignment film printing plate coating printing technique may include: the alignment film comprises an anilox roller, a scraper, an alignment film printing plate and a nozzle, wherein the anilox roller is provided with netlike arranged concave holes, the netlike arranged concave holes form an alignment pattern, the alignment pattern of the anilox roller is coated with an alignment solution extruded by the nozzle, the anilox roller transfers the alignment solution onto the alignment film printing plate, so that the alignment pattern is transferred onto the alignment film printing plate, the alignment film printing plate transfers the alignment solution on the surface of the alignment film printing plate onto a glass substrate through rotation, and the alignment pattern is transferred onto the glass substrate to form an alignment film on the substrate. The doctor blade is used for scraping the alignment solution on the anilox roller uniformly when the anilox roller rotates, so that the alignment film formed on the substrate is more uniform. Specifically, the scraper swings back and forth along the axial direction on the surface of the anilox roller at a certain frequency, so that the alignment solution in the gap between the scraper and the anilox roller is uniformly distributed on the surface of the anilox roller.
However, since the doctor blade is made of polymer plastics, the doctor blade is continuously worn in the alignment printing process, and the pressure difference between different contact points of the doctor blade and the anilox roller can also occur due to long-time swinging of the doctor blade, namely, the pressing amount of the doctor blade relative to the anilox roller changes, so that uneven gluing phenomenon occurs at different positions of the doctor blade, uneven thickness of alignment solution transferred onto the alignment film printing plate is caused, uneven thickness of alignment solution transferred onto the glass substrate is caused, for example, partial non-coating or thicker partial coating of the alignment solution formed on the glass substrate is caused, and the like. In the subsequent process, the problem of uneven display brightness of the liquid crystal display panel may be caused, and the yield of the display panel is reduced.
Disclosure of Invention
The embodiment of the invention provides a scraper clamp device, a scraping method thereof and an alignment film printer, which are used for solving the problem that an alignment solution on the surface of an anilox roller is uneven due to uneven pressing quantity of an existing scraper relative to the anilox roller.
In a first aspect, an embodiment of the present invention provides a doctor blade holder device and a doctor blade method thereof, including:
the plurality of clamp modules are used for clamping the scraper and are sequentially arranged along the extending direction parallel to the scraper;
The pressure sensors are in one-to-one correspondence with the clamp modules and are used for detecting the pressure of the scraper at different positions on the anilox roller;
The processing module is connected with the pressure sensors and the clamp modules; and the processing module is used for controlling each clamp module to apply pressure to the scraper in the direction of the anilox roller or apply tension to the scraper in the direction away from the anilox roller when the pressures of the scraper on the anilox roller at different positions are different, so that the pressures of the scraper on the anilox roller at different positions are the same.
Optionally, the processing module is configured to control each of the clamp modules to apply pressure to the doctor to the anilox roller or apply tension to the doctor to a direction away from the anilox roller when the pressures of the doctor to the anilox roller at different positions are different, so that the pressures of the doctor to the anilox roller at different positions are the same, and includes: and the processing module is used for controlling each clamp module to move relative to the scraper or controlling each clamp module to clamp the scraper to move when the pressures of the scrapers at different positions on the anilox roller are different, and applying the pressure to the anilox roller by the scraper or applying the tensile force to the scraper away from the anilox roller by the scraper so as to enable the pressures of the scrapers at different positions on the anilox roller to be the same.
Optionally, the fixture module includes: the clamping device comprises a chute mechanism, a clamp body and a clamp fixing mechanism; the clamp body moves along the chute mechanism; the chute mechanism is fixed on the fixture fixing mechanism.
Optionally, the fixture module further includes: the pressure sensor setting mechanism is fixedly connected with the clamp fixing mechanism and is used for setting the pressure sensors along the extending direction parallel to the scraper; the pressure sensor setting mechanism is provided with lever structures in one-to-one correspondence with the pressure sensors; the lever structure comprises a supporting seat and a lever; the power end of the lever is connected with one surface of the scraper, which is far away from the coating surface; the resistance end is connected with a corresponding pressure sensor, and the pressure sensor is used for detecting the tension of the dynamic end of the corresponding lever of the scraper at different positions when the scraper applies pressure to the direction of the anilox roller or applies tension to the direction far away from the anilox roller; the processing module is also used for acquiring the pressure of the scraper on the anilox roller according to the tension of the scraper on the power end of the lever.
Optionally, the fixture module further includes: the plurality of ranging sensors are arranged on one side, close to the coating surface of the scraper, of the corresponding clamp module and are used for acquiring the distance between the ranging sensors and the anilox roller; the distance measuring sensor is connected with the processing module, and the processing module is used for acquiring an included angle between a tangent plane at the contact position of the scraper and the anilox roller and the side surface of the scraper parallel to the extending direction according to the distance between the distance measuring sensor and the anilox roller; the processing module is also used for controlling all the clamp modules to apply pressure to the scraper towards the anilox roller or apply tension to the scraper away from the anilox roller according to the included angle between the tangent plane of the contact part of the scraper and the anilox roller and the side surface of the scraper when the pressures of the scraper to the anilox roller at different positions are the same so as to increase or decrease the pressure of the scraper to the anilox roller; or the processing module is further used for controlling each clamp module to adjust the included angle between the tangent plane of the contact position of the scraper and the anilox roller at different positions and the side surface of the scraper when the included angle between the tangent plane of the contact position of the scraper and the anilox roller at different positions and the side surface of the scraper is different, so that the included angles are the same.
Optionally, a side of the clamp body contacting the scraper is a frosted surface.
Optionally, the material of anchor clamps body with chute mechanism is stainless steel or ceramic.
Optionally, the scraper is made of polytetrafluoroethylene, polycarbonate or polymethyl methacrylate.
In a second aspect, an embodiment of the present invention further provides a doctor blade method of a doctor blade fixture device, including:
controlling a plurality of pressure sensors to detect the pressure of the scraper on the anilox roller at different positions;
and when the pressure of the scraper on the anilox roller at different positions is different, controlling each clamp module to apply pressure to the scraper towards the anilox roller or apply tension to the scraper away from the anilox roller, so that the pressure of the scraper on the anilox roller at different positions is the same.
Optionally, when the pressures of the doctor blade on the anilox roller at different positions are different, controlling each clamp module to apply pressure to the doctor blade in the direction of the anilox roller or apply tension to the doctor blade in the direction away from the anilox roller, so that the pressures of the doctor blade at different positions on the anilox roller are the same, including: when the pressure of the scraper on the anilox roller at different positions is different, each clamp module is controlled to move relative to the scraper or each clamp module is controlled to clamp the scraper to move, the scraper is applied with pressure in the direction of the anilox roller or is applied with pulling force in the direction away from the anilox roller, and therefore the pressure of the scraper on the anilox roller at different positions is the same.
Optionally, the doctor blade clamping device further includes: the plurality of ranging sensors are arranged on one side, close to the coating surface of the scraper, of the corresponding clamp module and are used for acquiring the distance between the ranging sensors and the anilox roller; the distance measuring sensor is connected with the processing module, and the processing module is used for acquiring an included angle between a tangent plane at the contact position of the scraper and the anilox roller and the side surface of the scraper parallel to the extending direction according to the distance between the distance measuring sensor and the anilox roller; the liquid scraping method of the scraper clamp device further comprises the following steps: when the pressure of the scraper on the anilox roller at different positions is the same, controlling all the clamp modules to apply pressure to the scraper in the direction of the anilox roller or apply tension to the scraper in the direction away from the anilox roller according to the included angle between the tangent plane of the contact part of the scraper and the anilox roller and the side surface of the scraper so as to increase or decrease the pressure of the scraper on the anilox roller; or when the included angles between the tangent planes of the contact positions of the scraper and the anilox roller at different positions and the side surfaces of the scraper are different, controlling each clamp module to adjust the included angles between the tangent planes of the contact positions of the scraper and the anilox roller at different positions and the side surfaces of the scraper so that the included angles are the same.
In a third aspect, an embodiment of the present invention further provides an alignment film printing machine, including the doctor blade fixture device provided in any embodiment of the present invention.
According to the invention, the pressure of the doctor on the anilox roller is regulated by the plurality of clamp modules which are sequentially arranged along the extending direction of the doctor, the pressure of the doctor on the anilox roller at the position of different clamp modules is detected by the pressure sensors which are arranged in one-to-one correspondence with the clamp modules, the processing module controls the clamp modules to apply the pressure to the direction of the doctor on the anilox roller or apply the tension to the direction away from the anilox roller according to the pressure of the doctor at each position detected by each pressure sensor, so that the pressure of the doctor on the anilox roller at different positions is ensured to be the same, the pressing-in amount of the doctor at different positions relative to the anilox roller is the same, when the doctor clamp device scrapes the alignment solution on the surface of the anilox roller, the alignment solution can be coated more uniformly, the uneven condition of the formed alignment film layer is avoided, and the production yield of the formed display device is improved.
Drawings
FIG. 1 is a schematic diagram of an alignment film printer of the prior art;
FIG. 2 is a front view of a doctor blade holder device provided in accordance with an embodiment of the present invention;
FIG. 3 is a top view of a partial structure of a doctor blade clamping device provided by an embodiment of the invention;
FIG. 4 is a side view of a partial structure of a doctor blade clamping device provided by an embodiment of the invention;
FIG. 5 is a front view of a partial structure of a doctor blade holder device provided by an embodiment of the invention;
FIG. 6 is a side view of a partial structure of another doctor blade clamping device provided in accordance with an embodiment of the invention;
FIG. 7 is a front view of another doctor blade holder device provided by an embodiment of the invention;
FIG. 8 is a side view of a partial structure of yet another doctor blade clamping device provided in accordance with an embodiment of the invention;
FIG. 9 is a side view of a partial structure of yet another doctor blade clamping device provided in accordance with an embodiment of the invention;
fig. 10 is a schematic flow chart of a liquid scraping method of a scraper fixture apparatus according to an embodiment of the present invention;
FIG. 11 is a schematic flow chart of a method for doctoring a doctor blade holder device according to another embodiment of the present invention;
fig. 12 is a schematic partial structure of an alignment film printer according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Referring to fig. 1, fig. 1 is a schematic structural view of an alignment film printer in the prior art, the alignment film printer including: an anilox roller 1, a doctor roller 2 or doctor blade, a ketone 3, an alignment film printing plate 4 and a nozzle 5. The anilox roller 1 is used for coating the alignment solution on the printing plate 4, dense pits are arranged on the anilox roller 1 in a net shape and used for storing the alignment solution, when the anilox roller 1 is contacted with the alignment film printing plate 4, the alignment solution stored in the pits is transferred onto the alignment film printing plate 4, and the alignment solution on the alignment film printing plate 4 is transferred onto the glass substrate 6 by the anilox roller 3 to form the alignment film 61. The main function of the nozzle 5 is to transport and extrude the alignment solution, the alignment solution is extruded into a gap formed by the doctor roll 2 or the scraper and the anilox roll 1, the doctor roll 2 or the scraper is used for scraping the alignment solution on the anilox roll 1 evenly when the anilox roll 1 rotates, the uniformity of the dispersion of the alignment solution on the anilox roll 1 is increased, the aggregation of the alignment solution is avoided, the doctor roll 2 and/or the scraper can be arranged in an alignment film printer, the functions of the doctor roll and the scraper are the same, the doctor roll can achieve the purpose of even glue through the contact of the roll surface and the anilox roll 1, and the scraper is used for dispersing and coating the alignment solution through a blade. If the rubber scraping roller and the scraper are arranged at the same time, the scraper plays a main role in homogenizing rubber, and the rubber scraping roller plays an auxiliary role in homogenizing rubber.
At present, when the doctor blade spin mainly rotates through the anilox roller 1, the doctor blade is arranged to reciprocate along the direction of the rotating shaft of the anilox roller 1 at a certain frequency, and the extending direction of the doctor blade is also parallel to the direction of the rotating shaft of the anilox roller 1, so that the alignment solution gathered between the doctor blade and the anilox roller 1 is uniformly dispersed on the anilox roller 1, as the material of the doctor blade is high polymer plastic, in the production process, the doctor blade can be continuously worn, the pressure of different contact points of the doctor blade and the anilox roller 1 can be generated due to the long-time oscillation of the doctor blade, namely, the pressing amount of the doctor blade pressed into the anilox roller 1 at different positions is changed, thereby further causing the phenomenon that the thickness of the alignment solution transferred to the alignment film printing plate 4 by the anilox roller 1 is not uniform, further causing the uneven thickness of the alignment film 61 transferred to the glass substrate 6 of the alignment film printing plate 4, and the problem of various uneven distribution MUAs such as partial uncoated, partial coating thickness and the like, finally influencing the back section of the display panel, and reducing the product rate.
In order to solve the problem of uneven pressing amount of the existing doctor blade relative to the anilox roller, an embodiment of the present invention provides a doctor blade clamp device, and referring to fig. 2, fig. 2 is a front view of the doctor blade clamp device provided by the embodiment of the present invention, including:
A plurality of jig modules 21 for holding the doctor blade 22 and sequentially arranged in parallel with the extending direction of the doctor blade 22;
the plurality of pressure sensors 23, the plurality of pressure sensors 23 are in one-to-one correspondence with the plurality of clamp modules 21, and the plurality of pressure sensors 23 are used for detecting the pressure of the doctor 22 at different positions on the anilox roller;
a processing module 24, to which the plurality of pressure sensors 23 and the plurality of jig modules 21 are connected; the processing module 24 is used for controlling each clamp module 21 to apply pressure to the doctor 22 towards the anilox roller or apply tensile force to the doctor 22 away from the anilox roller when the pressures of the doctor 22 on the anilox roller at different positions are different, so that the pressures of the doctor 22 on the anilox roller at different positions are the same.
In this embodiment, the doctor blade 22 may be made of a high-strength polymer resin material, and has a certain rigidity and flexibility, so that contact damage to the anilox roller is reduced compared with a metal doctor blade. Optionally, the scraper is made of polytetrafluoroethylene, polycarbonate or polymethyl methacrylate.
The existing doctor blade 22 is mounted on the alignment film printing machine through a fixed clamp, and the pressure control mechanisms arranged on two sides of the doctor blade 22 along the extending direction are manually adjusted by an operator to adjust the pressing-in amount of the whole clamp, so that the adjusting process is wasteful of manpower and inaccurate in adjustment, for example, because the doctor blade 22 has certain flexibility, when the operator adjusts the pressure control mechanism on the first side, the pressing-in amount of the second side of the doctor blade 22 pressed into the anilox roller is changed along with the pressing-in amount of the second side of the doctor blade 22, or when the pressure control mechanisms on two sides of the doctor blade 22 are adjusted, the pressing-in amount of the middle side of the doctor blade 22 is unchanged, and the pressing-in amount of the middle side of the doctor blade 22 cannot be adjusted. In addition, for the high-generation line, it is necessary to coat the alignment film with a larger-sized glass substrate, and the length of the doctor blade 22 in the extending direction is long, so that the difference in the press-in amounts between the intermediate side and the both sides of the doctor blade 22 is more likely to be large.
The doctor blade holder device in this embodiment includes a plurality of holder modules 21 separated from each other, and as shown in fig. 2, each holder module 21 is arranged along the extension direction x of the doctor blade 22, and preferably, each holder module 21 is uniformly distributed along the doctor blade 22. Each clamp module 21 respectively applies pressure close to the direction of the anilox roller or tension far away from the direction of the anilox roller to one part of the scraper at the position under the control of the processing module 24, so that the pressing-in amounts of the scraper 22 to the anilox roller at different positions can be independently adjusted, the consistency of the pressing-in amounts of the scraper 22 to the anilox roller at different positions is ensured, the uniformity of the scraping liquid of the scraper 22 is ensured, the uniformity of an alignment film formed on a glass substrate is further ensured, and the product yield is improved. It is worth noting that, as shown in fig. 2, one end of the scraper 22 away from the clamp module 21 is a side close to the anilox roller, and the scraper clamp device provided by the application adjusts the force exerted by the scraper 22 on the anilox roller, so that when the scraper 22 scrapes liquid, the scrapers 22 at different positions apply force uniformly to the anilox roller, the problem of serious abrasion of the scrapers is avoided, and the service life of the scraper 22 is prolonged.
In addition, because the different positions of the scraper 22 apply force to the anilox roller uniformly, the scraper 22 is not easy to have the problem that some positions of the scraper 22 are seriously worn or notched, the scraper 22 on the alignment film printer is not required to be replaced frequently, and the production time of the production line is not delayed, so that the production efficiency of the production line is improved.
Each clamp module 21 is provided with a one-to-one corresponding pressure sensor 23, the pressure sensor 23 can measure the pressure applied by the clamp module 21 to the doctor 22, because the pressure applied by the clamp module 21 to the doctor 22 has a certain relation with the pressure applied by the doctor 22 to the anilox roller, the application force of the doctor 22 to the anilox roller can be obtained through the pressure sensor 23, the application force of the doctor 22 to the anilox roller can be compared by the processing module 24 at different positions, and when the difference value of the pressure values of the application forces is larger than a set threshold value, the application force of the clamp modules 21 to the doctor 22 is adjusted, so that the equality of the pressure values of the application of the clamp modules 21 to the doctor 22 is ensured.
The doctor blade clamp device that this embodiment provided is through adjusting the pressure of doctor blade to the anilox roller along a plurality of anchor clamps module that set gradually on being on a parallel with the doctor blade extension direction to detect the pressure of different anchor clamps module department doctor blades to the anilox roller through the pressure sensor that sets up with anchor clamps module one-to-one, the processing module is according to the pressure of each position doctor blade to the anilox roller that each pressure sensor detected, control anchor clamps module is with the doctor blade to the anilox roller direction application pressure or with the doctor blade to keeping away from the anilox roller direction application pulling force, so that the pressure of different position department doctor blades is the same to the anilox roller, thereby make the indentation volume of different position department doctor blades for the anilox roller the same, when doctor blade clamp device scrapes the alignment solution on anilox roller surface, can be more even with the alignment solution coating, the uneven condition appears in the alignment rete of avoiding formation, improve the production yield of the display device who forms.
On the basis of the above embodiment, when the pressures of the doctor blade 22 on the anilox roller at different positions are different, the processing module 24 controls each clamp module 21 to apply the pressure to the doctor blade 22 in the direction of the anilox roller or apply the tension to the doctor blade 22 in the direction away from the anilox roller, so that the pressures of the doctor blade 22 on the anilox roller at different positions are the same, and includes: the processing module 24 is used for controlling each clamp module 21 to move relative to the doctor 22 or controlling each clamp module 21 to clamp the doctor 22 to move when the pressures of the doctor 22 on the anilox roller at different positions are different, and applying the pressure to the doctor 22 towards the anilox roller or applying the tension to the doctor 22 away from the anilox roller, so that the pressures of the doctor 22 on the anilox roller at different positions are the same.
There may be two ways to control the clamp module 21 to apply pressure to the doctor blade 22 in the direction of the anilox roller or to apply tension to the doctor blade 22 in the direction away from the anilox roller: first, each of the gripper modules 21 is controlled to move relative to the doctor blade 22 such that a dynamic friction force between the gripper modules 21 and the doctor blade 22 acts as a force applied by the gripper modules 21 to the doctor blade 22, for example, when the gripper modules 21 slide relative to the doctor blade 22 in a direction away from the anilox roller, the gripper modules 21 apply a tensile force to the doctor blade 22 in a direction away from the anilox roller, and when the gripper modules 21 slide relative to the doctor blade 22 in a direction toward the anilox roller, the gripper modules 21 apply a pressure to the doctor blade in a direction toward the anilox roller, and the force applied by the gripper modules 21 to the doctor blade 22 can be adjusted by adjusting the dynamic friction force between the gripper modules 21 and the doctor blade 22; second, each of the jig modules 21 is controlled to clamp the doctor 22 for movement, and there is no relative displacement between the jig module 21 and the doctor 22.
Fig. 3 is a top view of a partial structure of a doctor blade holder device according to an embodiment of the present invention, fig. 4 is a side view of a partial structure of a doctor blade holder device according to an embodiment of the present invention, fig. 5 is a front view of a partial structure of a doctor blade holder device according to an embodiment of the present invention, and referring to fig. 2 to 5, optionally, a holder module 21 includes: a chute mechanism 211, a jig body 212, and a jig fixing mechanism 213; the clamp body 212 moves along the chute mechanism 211; the slide groove mechanism 211 is fixed to the jig fixing mechanism 213.
If the clamp module 21 applies pressure or tension to the scraper 22 through dynamic friction with the scraper 22, the clamp body 212 slides relative to the chute mechanism 212 along the extending direction x perpendicular to the scraper 22, and applies pressure close to the anilox roller or tension far from the anilox roller to the scraper 22; if the clamp module 21 clamps the scraper 22 for movement, the clamp body 212 may not slide relatively along the sliding groove mechanism 211, and the sliding groove mechanism 211 only serves as a receiving structure of the clamp body 212.
The clamp fixing mechanism 213 is fixedly connected to the slide groove mechanism 211, and is used for fixing the position of each clamp module 21. And the clamp fixing mechanism 213 is further used for being connected with an alignment film printer, referring to fig. 2, the clamp fixing mechanism 213 is connected with the alignment film printer through a rotating shaft 214, and controls a doctor blade clamp device to be arranged close to an anilox roller, similar to the relative position of the doctor roller 2 and the anilox roller 1 in fig. 1.
Optionally, as shown in fig. 3 and 4, a side of the clamp body 212 contacting the doctor blade 22 is a frosted surface 2121, so as to improve the anchoring force of the clamp body 212 to the doctor blade 22, and facilitate increasing the friction force to the doctor blade 22 when the clamp body 212 moves along the chute mechanism 211. The frosted surface 2121 is considered to be a high-strength corrosion-resistant polymer resin material such as polytetrafluoroethylene, and is considered to be a corrosion-resistant metal material. The material of the chute mechanism 211 is as consistent as possible with the clamp body 212, and the shape can be concave or convex, so long as the chute mechanism is matched with the clamp body 212. Optionally, the material of the clamp body 212 and the chute mechanism 211 is stainless steel or ceramic.
Alternatively, the pressure sensor 23 may be disposed on a side of the clamp body 212 near the doctor blade 22, as shown in fig. 6, fig. 6 is a side view of a partial structure of another doctor blade clamp device provided in an embodiment of the present invention, where the pressure sensor 23 may be used to sense a dynamic friction force or a clamping force between the clamp body 212 and the doctor blade 22, i.e. the pressure sensor 23 may measure a force applied by the clamp body 212 to the doctor blade 22, so as to obtain a force applied by the doctor blade 22 to the anilox roller.
Alternatively, the pressure sensor 23 may also be provided on the pressure sensor setting mechanism, and referring to fig. 7 and 8, fig. 7 is a front view of another doctor blade holder device provided in an embodiment of the present invention, and fig. 8 is a side view of a partial structure of yet another doctor blade holder device provided in an embodiment of the present invention, where the holder module 21 further includes: a pressure sensor setting mechanism 215 fixedly connected to the jig fixing mechanism 213 for setting the plurality of pressure sensors 23 in a direction parallel to the extending direction of the doctor blade 22; the pressure sensor setting mechanism 215 is provided with lever structures 216 in one-to-one correspondence with the pressure sensors 23; the lever structure 216 includes a support seat 217 and a lever 218; the power end of the lever 218 is connected with the surface of the scraper 22 away from the coating surface; the resistance end is connected with a corresponding pressure sensor 23, and the pressure sensor 23 is used for detecting the tension of the dynamic ends of the corresponding levers 218 of the scrapers 22 at different positions when the scrapers 22 apply pressure to the direction of the anilox roller or apply tension to the direction away from the anilox roller; the processing module 24 is also used to obtain the pressure of the doctor 22 against the anilox roller based on the tension of the doctor 22 against the power end of the lever 218.
The clamp body 212 applies force to the doctor blade 22 by a dynamic friction force or applies force to the doctor blade 22 by clamping the doctor blade 22, and the applied force to the anilox roller by the coating surface P of the doctor blade 22 contacting the anilox roller can be measured by the pressure sensor 23 shown in fig. 7 and 8. For example, when the doctor blade 22 needs to reduce the pressure applied to the anilox roller, the clamp body 212 applies a pulling force F2 to the doctor blade 22 in a direction away from the anilox roller, and then the power end of the lever 218 is moved by the doctor blade 22 in a direction away from the anilox roller, so that the resistance end of the lever 218 applies a pressure F1 to the pressure sensor 23, according to the pulling force F1 of the resistance end of the lever 218, the power arm L1 of the resistance end of the lever 218, and the resistance arm L2 of the power end of the lever 218, and according to the lever balance condition: f1=f1=f2×l2, and the tension F2 applied by the clamp body 212 to the doctor blade 22 in the direction away from the anilox roller is obtained, thereby obtaining the force of the doctor blade 22 against the anilox roller. Similarly, when the doctor blade 22 needs to increase the pressure applied to the anilox roller, the clamp body 212 applies the pressure F2 to the doctor blade 22 in the direction approaching the anilox roller, and then the power end of the lever 218 is driven by the doctor blade 22 to move in the direction approaching the anilox roller, so that the resistance end of the lever 218 applies the pressure F1 'to the pressure sensor 23, and according to the pressure F1' of the resistance end of the lever 218, the power arm L1 'of the resistance end of the lever 218, and the resistance arm L2' of the power end of the lever 218, and according to the lever balance condition: f1' ×l1' =f2 ' ×l2', the pressure F2' applied by the clamp body 212 to the doctor blade 22 in the direction approaching the anilox roller is obtained, and thus the applied force of the doctor blade 22 to the anilox roller is obtained.
In addition, the pressure sensor 23 provided on the pressure sensor setting mechanism 215 may be provided with an elastic member, such as a spring or the like, between the pressure sensor 23 and the doctor blade 22, in addition to the force applied to the doctor blade 22 against the anilox roller by the lever structure 216, by which the force applied to the anilox roller by the doctor blade 22 can be detected by the pressure sensor 23.
Referring to fig. 6 and 8, optionally, the doctor blade clamping device further includes: a plurality of ranging sensors 25, which are arranged at one side of the corresponding fixture module, which is close to the coating surface of the scraper 22, for acquiring the distance between the ranging sensors 25 and the anilox roller; the distance measuring sensor 25 is connected with the processing module 24, and the processing module 24 is used for acquiring an included angle alpha between a tangent plane at the contact position of the scraper 22 and the anilox roller and the side surface of the scraper 22 parallel to the extending direction according to the distance between the distance measuring sensor 25 and the anilox roller; the processing module 24 is further configured to control all the clamp modules 21 to apply pressure to the doctor 22 toward the anilox roller or apply tension to the doctor 22 away from the anilox roller according to an included angle α between a tangential plane of contact of the doctor 22 and the anilox roller and a side surface of the doctor when pressures of the doctor 22 to the anilox roller at different positions are the same, so as to increase or decrease the pressure of the doctor 22 to the anilox roller; or the processing module 24 is further configured to control each clamp module 21 to adjust the included angle α between the tangent plane at the contact position of the doctor 22 and the anilox roller and the side surface of the doctor so that the included angle α is the same when the included angles α between the tangent plane at the contact position of the doctor 22 and the anilox roller at different positions and the side surface of the doctor are different.
Alternatively, the distance measuring sensor 25 may be an infrared sensor, a laser sensor or an ultrasonic sensor, which measures the distance between the distance measuring sensor 25 and the anilox roller according to the time difference between the transmission and reception of the signals by transmitting the light wave signal or the sound wave signal and receiving the reflected light wave signal or the sound wave signal.
Referring to fig. 9, fig. 9 is a side view showing a partial structure of a doctor blade clamp device according to an embodiment of the present invention, a distance measuring sensor 25 may be disposed on one side of a clamp body 212 close to an anilox roller 1, the distance between the distance measuring sensor 25 disposed on the clamp body 212 on one side of a doctor blade 22 and the surface of the anilox roller 1 is measured as d1, the distance between the distance measuring sensor 25 disposed on the clamp body 212 on the other side of the doctor blade and the anilox roller is measured as d2, and an angle α between a tangent plane of the contact portion of the doctor blade 22 and the anilox roller 1 and a doctor blade side face N may be obtained by the measured distances d1 and d2 and the distance between the two distance measuring sensors 25. In this embodiment, the doctor blade 22 comprises a coating face P, a facing away face facing away from the coating face, two doctor blade side faces N parallel to the extension direction of the doctor blade 22, and two doctor blade end faces perpendicular to the doctor blade side faces N, the coating face P and the facing away face.
When the included angle alpha is different, even if the applied force of the clamp modules 21 to the scraper 22 is the same, the pressure of the scraper 22 to the anilox roller 1 is different, and when the included angle alpha between the side surface N of the scraper at the position of the scraper 22 where each clamp module 21 is located and the tangential plane of the contact position of the anilox roller 1 is the same, the included angle alpha at the position of each clamp module 21 can be adjusted by the same amplitude, so that the applied force of the scraper at the position of each clamp module 21 to the anilox roller is finely adjusted, and the adjustment precision of the applied force of the scraper 22 to the anilox roller 1 is improved.
When the included angle alpha between the scraper side surface N of the scraper 22 where each clamp module 21 is located and the tangent plane of the contact part of the anilox roller 1 is different, the included angle alpha between the scraper side surface N of the scraper 21 where each clamp module 21 is located and the tangent plane of the contact part of the anilox roller is adjusted, so that the included angle alpha between the scraper 22 and the tangent plane of the contact part of the anilox roller 1 is the same, and the clamp module 21 ensures that the change amount of the applied force of the scraper 22 to the anilox roller at each position is the same when the applied force of each position of the scraper 22 is adjusted by the same amplitude.
Based on the same conception, the embodiment of the invention also provides a liquid scraping method of the scraper clamp device, which is implemented by the scraper clamp device provided by any embodiment of the invention. Fig. 10 is a schematic flow chart of a liquid scraping method of a scraper fixture apparatus according to an embodiment of the present invention, as shown in fig. 10, the method of the present embodiment includes the following steps:
s101, controlling a plurality of pressure sensors to detect the pressure of the scraper at different positions on the anilox roller.
And S102, when the pressure of the scrapers at different positions on the anilox roller is different, controlling each clamp module to apply pressure to the scrapers towards the anilox roller or apply tension to the scrapers away from the anilox roller, so that the pressure of the scrapers at different positions on the anilox roller is the same.
According to the liquid scraping method of the scraper clamp device, the pressure of the scraper to the anilox roller is regulated through the plurality of clamp modules which are sequentially arranged along the extending direction parallel to the scraper, the pressure of the scraper to the anilox roller at the position of the different clamp modules is detected through the pressure sensors which are arranged in one-to-one correspondence with the clamp modules, the processing module applies the pressure to the anilox roller or applies the tensile force to the scraper away from the anilox roller according to the pressure of the scraper at each position detected by each pressure sensor, so that the pressure of the scraper at different positions to the anilox roller is ensured to be the same, the pressing-in amount of the scraper at different positions relative to the anilox roller is the same, when the scraper clamp device scrapes the alignment solution on the surface of the anilox roller, the alignment solution can be coated more uniformly, uneven occurrence of an alignment film layer formed is avoided, and the production yield of the formed display device is improved.
On the basis of the above embodiment, when the pressures of the doctor blades on the anilox roller at different positions are different, controlling each clamp module to apply pressure to the doctor blade in the direction of the anilox roller or apply tension to the doctor blade in the direction away from the anilox roller so that the pressures of the doctor blades at different positions on the anilox roller are the same, including: when the pressure of the scraper at different positions on the anilox roller is different, each clamp module is controlled to move relative to the scraper or each clamp module is controlled to clamp the scraper to move, the scraper is applied with pressure in the direction of the anilox roller or is applied with tension in the direction away from the anilox roller, so that the pressure of the scraper at different positions on the anilox roller is the same.
Optionally, the fixture module further comprises: the plurality of ranging sensors are arranged on one side, close to the coating surface of the scraper, of the corresponding clamp module and are used for acquiring the distance between the ranging sensors and the anilox roller; the distance measuring sensor is connected with the processing module, and the processing module is used for acquiring an included angle between a tangent plane at the contact position of the scraper and the anilox roller and the side surface of the scraper parallel to the extending direction according to the distance between the distance measuring sensor and the anilox roller; referring to fig. 11, fig. 11 is a schematic flow chart of a liquid scraping method of another doctor blade holder device according to an embodiment of the present invention, where the liquid scraping method of the doctor blade holder device includes:
S201, controlling a plurality of pressure sensors to detect the pressure of the scraper at different positions on the anilox roller.
And S202, when the pressure of the scraper at different positions on the anilox roller is different, controlling each clamp module to apply pressure to the scraper towards the anilox roller or apply tension to the scraper away from the anilox roller, so that the pressure of the scraper at different positions on the anilox roller is the same.
S203, when the pressure of the scraper at different positions on the anilox roller is the same, controlling all clamp modules to apply pressure to the scraper towards the anilox roller or apply tension to the scraper away from the anilox roller according to the included angle between the tangent plane of the contact position of the scraper and the anilox roller and the side surface of the scraper so as to increase or decrease the pressure of the scraper on the anilox roller; or when the included angles between the tangent planes of the contact positions of the scrapers and the anilox roller at different positions and the side surfaces of the scrapers are different, controlling each clamp module to adjust the included angles between the tangent planes of the contact positions of the scrapers and the anilox roller at different positions and the side surfaces of the scrapers so that the included angles are the same.
The embodiment of the invention also provides an alignment film printer. Fig. 12 is a schematic partial structure diagram of an alignment film printer according to an embodiment of the present invention, and as shown in fig. 12, the alignment film printer according to an embodiment of the present invention includes a doctor blade fixture device 20 according to any embodiment of the present invention. The doctor blade clamp device 20 is in contact with the anilox roller 1 and forms a specific included angle with the anilox roller 1, and an alignment solution is sprayed into the included angle formed between the doctor blade clamp device 20 and the anilox roller 1 through the nozzle 5, so that the doctor blade clamp device 20 reciprocates along the extending direction of the doctor blade to uniformly coat the alignment solution on the surface of the anilox roller 1, the uniformity of the thickness of an alignment film formed on a glass substrate is improved, and the product yield of a finally formed display panel is improved.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. A doctor blade clamping device, comprising:
the plurality of clamp modules are used for clamping the scraper and are sequentially arranged along the extending direction parallel to the scraper;
The pressure sensors are in one-to-one correspondence with the clamp modules and are used for detecting the pressure of the scraper at different positions on the anilox roller;
The processing module is connected with the pressure sensors and the clamp modules; the processing module is used for controlling each clamp module to apply pressure to the scraper in the direction of the anilox roller or apply tension to the scraper in the direction away from the anilox roller when the pressures of the scraper on the anilox roller at different positions are different, so that the pressures of the scraper on the anilox roller at different positions are the same;
The plurality of clamp modules are uniformly distributed along the scraper;
The processing module is used for controlling each clamp module to apply pressure to the scraper towards the anilox roller or apply tension to the scraper away from the anilox roller when the pressures of the scraper on the anilox roller at different positions are different, so that the pressures of the scraper on the anilox roller at different positions are the same, and the processing module comprises:
The processing module is used for controlling each clamp module to move relative to the scraper or controlling each clamp module to clamp the scraper to move when the pressures of the scraper on the anilox roller at different positions are different, and applying the pressure to the anilox roller by the scraper or applying the tensile force to the scraper away from the anilox roller by the scraper so as to enable the pressures of the scraper on the anilox roller at different positions to be the same;
the jig module includes: the clamping device comprises a chute mechanism, a clamp body and a clamp fixing mechanism;
the clamp body moves along the chute mechanism;
the chute mechanism is fixed on the fixture fixing mechanism;
The clamp module further includes: the pressure sensor setting mechanism is fixedly connected with the clamp fixing mechanism and is used for setting the pressure sensors along the extending direction parallel to the scraper;
the pressure sensor setting mechanism is provided with lever structures in one-to-one correspondence with the pressure sensors; the lever structure comprises a supporting seat and a lever;
the power end of the lever is connected with one surface of the scraper, which is far away from the coating surface; the resistance end is connected with a corresponding pressure sensor, and the pressure sensor is used for detecting the tension of the dynamic end of the corresponding lever of the scraper at different positions when the scraper applies pressure to the direction of the anilox roller or applies tension to the direction far away from the anilox roller;
The processing module is also used for acquiring the pressure of the scraper on the anilox roller according to the tension of the scraper on the power end of the lever.
2. The doctor blade clamping device as claimed in claim 1, further comprising:
the plurality of ranging sensors are arranged on one side, close to the coating surface of the scraper, of the corresponding clamp module and are used for acquiring the distance between the ranging sensors and the anilox roller;
The distance measuring sensor is connected with the processing module, and the processing module is used for acquiring an included angle between a tangent plane at the contact position of the scraper and the anilox roller and the side surface of the scraper parallel to the extending direction according to the distance between the distance measuring sensor and the anilox roller;
The processing module is also used for controlling all the clamp modules to apply pressure to the scraper towards the anilox roller or apply tension to the scraper away from the anilox roller according to the included angle between the tangent plane of the contact part of the scraper and the anilox roller and the side surface of the scraper when the pressures of the scraper to the anilox roller at different positions are the same so as to increase or decrease the pressure of the scraper to the anilox roller; or the processing module is further used for controlling each clamp module to adjust the included angle between the tangent plane of the contact position of the scraper and the anilox roller at different positions and the side surface of the scraper when the included angle between the tangent plane of the contact position of the scraper and the anilox roller at different positions and the side surface of the scraper is different, so that the included angles are the same.
3. The doctor blade holder device of claim 1, wherein:
one side of the clamp body, which is contacted with the scraper, is a frosted surface.
4. The doctor blade holder device of claim 1, wherein:
the clamp body and the chute mechanism are made of stainless steel or ceramic.
5. The doctor blade holder device of claim 1, wherein:
The scraper is made of polytetrafluoroethylene, polycarbonate or polymethyl methacrylate.
6. A doctor blade clamping device doctor blade method, characterized in that it is performed by a doctor blade clamping device according to any of claims 1-5, comprising:
controlling a plurality of pressure sensors to detect the pressure of the scraper on the anilox roller at different positions;
When the pressure of the scraper on the anilox roller at different positions is different, controlling each clamp module to apply pressure to the scraper in the direction of the anilox roller or apply tension to the scraper in the direction away from the anilox roller, so that the pressure of the scraper on the anilox roller at different positions is the same;
When the pressure of the scraper on the anilox roller at different positions is different, controlling each clamp module to apply pressure to the scraper towards the anilox roller or apply tension to the scraper away from the anilox roller, so that the pressure of the scraper on the anilox roller at different positions is the same, and the clamp module comprises:
When the pressure of the scraper on the anilox roller at different positions is different, each clamp module is controlled to move relative to the scraper or each clamp module is controlled to clamp the scraper to move, the scraper is applied with pressure in the direction of the anilox roller or is applied with pulling force in the direction away from the anilox roller, and therefore the pressure of the scraper on the anilox roller at different positions is the same.
7. The doctor blade holder device doctor blade method as claimed in claim 6, characterized in that,
The clamp module further includes: the plurality of ranging sensors are arranged on one side, close to the coating surface of the scraper, of the corresponding clamp module and are used for acquiring the distance between the ranging sensors and the anilox roller; the distance measuring sensor is connected with the processing module, and the processing module is used for acquiring an included angle between a tangent plane at the contact position of the scraper and the anilox roller and the side surface of the scraper parallel to the extending direction according to the distance between the distance measuring sensor and the anilox roller;
The liquid scraping method of the scraper clamp device further comprises the following steps:
When the pressure of the scraper on the anilox roller at different positions is the same, controlling all the clamp modules to apply pressure to the scraper in the direction of the anilox roller or apply tension to the scraper in the direction away from the anilox roller according to the included angle between the tangent plane of the contact part of the scraper and the anilox roller and the side surface of the scraper so as to increase or decrease the pressure of the scraper on the anilox roller; or alternatively
And when the included angles between the tangent planes of the contact positions of the scraper and the anilox roller at different positions and the side surfaces of the scraper are different, controlling each clamp module to adjust the included angles between the tangent planes of the contact positions of the scraper and the anilox roller at different positions and the side surfaces of the scraper so that the included angles are the same.
8. An alignment film printer comprising a doctor blade holder device according to any one of claims 1 to 5.
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| CN201811644604.4A CN109514991B (en) | 2018-12-30 | 2018-12-30 | Scraper fixture device, liquid scraping method thereof and alignment film printer |
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| DE102019117901A1 (en) * | 2019-07-03 | 2021-01-07 | Voith Patent Gmbh | Scraper device and method for determining the contact pressure of a scraper |
| CN113555644B (en) * | 2021-07-16 | 2023-05-12 | 中材锂膜有限公司 | Method for improving membrane surface crease of lithium battery membrane coating membrane |
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| JP2005231075A (en) * | 2004-02-17 | 2005-09-02 | Shinano Kenshi Co Ltd | Ink feeding apparatus and flexographic printing machine |
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| DE102009046078A1 (en) * | 2009-10-28 | 2011-05-05 | Koenig & Bauer Aktiengesellschaft | Device for pressure adjustment in a chambered doctor blade |
| CN202556900U (en) * | 2012-05-22 | 2012-11-28 | 武汉虹之彩包装印刷有限公司 | Pressure adjusting device of automatic ink scraping system |
| WO2016042677A1 (en) * | 2014-09-19 | 2016-03-24 | 千葉機械工業株式会社 | Blade device, and printer and coating apparatus provided with said blade device |
| CN204719373U (en) * | 2015-06-10 | 2015-10-21 | 北京京东方光电科技有限公司 | A kind of transfer printing board and transfer device |
| CN106226943B (en) * | 2016-10-11 | 2021-08-31 | 京东方科技集团股份有限公司 | Method for manufacturing quantum dot display device and corresponding quantum dot display device |
| CN108058496A (en) * | 2017-11-22 | 2018-05-22 | 张家港康得新光电材料有限公司 | Alignment film printing method and alignment film printing device |
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| CN105880115A (en) * | 2016-04-27 | 2016-08-24 | 安庆市鸿裕工业产品设计有限公司 | Control assembly for smoothness of anilox roller through operating scraper of dry lamination machine |
| US20170348965A1 (en) * | 2016-06-07 | 2017-12-07 | Mark Andy Inc. | Doctor blade holder and adjustment mechanism |
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