CN109501470B - Ink supply system, control method thereof and ink-jet printing device - Google Patents
Ink supply system, control method thereof and ink-jet printing device Download PDFInfo
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- CN109501470B CN109501470B CN201910028112.0A CN201910028112A CN109501470B CN 109501470 B CN109501470 B CN 109501470B CN 201910028112 A CN201910028112 A CN 201910028112A CN 109501470 B CN109501470 B CN 109501470B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
Abstract
The invention discloses an ink supply system, a control method thereof and an ink-jet printing device, relates to the technical field of ink-jet printing, and aims to solve the problem that the thickness of a printed film layer of the ink-jet printing device in the related art is not uniform. The ink supply system comprises a plurality of sub ink supply systems, and aiming at each sub ink supply system, each sub ink supply system comprises a main ink supply device, a first ink supply passage, an ink supply pump and a control valve, wherein the main ink supply device comprises a first ink storage cavity, the first ink supply device comprises a second ink storage cavity, the first end of the first ink supply passage is communicated with the first ink storage cavity, the second end of the first ink supply passage is used for being communicated with a printing nozzle of the ink-jet printing device, and the ink supply pump, the second ink storage cavity and the control valve are sequentially arranged on the first ink supply passage along the ink supply direction. The invention can be used for printing organic light-emitting materials in pixel units or thin film packaging organic materials in OLED display panels.
Description
Technical Field
The invention relates to the technical field of ink-jet printing, in particular to an ink supply system, a control method thereof and an ink-jet printing device.
Background
The ink-jet printing technology is to generate small ink drops and then to guide the small ink drops to a set position by using an ink-jet head, and has the advantages of good quality of printed patterns, rich layers, clear details and the like. Currently, the inkjet printing technology is applied to the field of manufacturing display devices, for example, in the manufacturing process of OLED (Organic Light-Emitting Diode), the preparation of a novel R/G/B Light-Emitting unit and the coating of TFE (Thin Film Encapsulation) Organic Film are applied to the inkjet printing technology.
The ink-jet printing is carried out on the ink-jet printing device, and during operation, ink materials used by the ink-jet printing device are conveyed to a printing head (print head) through an ink supply system, and then the ink materials are uniformly printed on a glass substrate through the printing head to form a film layer structure required by the process.
An ink supply system of an inkjet printing apparatus in the related art, as shown in fig. 1, includes two main ink supplies 01, two first ink supplies 02, an ink supply pump 03 and an ink supply path 04, where each main ink supply 01 includes a first ink storage cavity 011, the first ink supply 02 includes a second ink storage cavity 021, one end of the ink supply path 04 is respectively communicated with the first ink storage cavities 011 of the two main ink supplies 01 through two ink supply branches 05, the other end of the ink supply path is used for being communicated with a printing nozzle of the inkjet printing apparatus, the ink supply pump 03 and the second ink storage cavity 021 are sequentially disposed on the ink supply path 04, and each ink supply branch 05 is provided with a control valve 06. During printing, one control valve 06 is opened, and the other control valve 06 is closed, so that ink is supplied to a printing nozzle by one main ink supply device 01 in the printing process; when the ink material in one main ink supply device 01 is used up, the other main ink supply device 01 starts to supply ink to the printing nozzle, and meanwhile, the operator replaces the main ink supply device 01 with the ink with the used up main ink supply device 01, so that the ink jet printing device continues to work.
In the ink supply system of the inkjet printing device, since the main ink supply device 01 needs to be replaced after the ink material in one main ink supply device 01 is used up, the ink in the ink supply branch 05 connected to the main ink supply device 01 after replacement is emptied, that is, the ink supply branch 05 is filled with gas, when the main ink supply device 01 after replacement supplies ink to the printing nozzle again, due to the suction effect of the ink supply pump 03, the ink output by the main ink supply device 01 interacts with the gas in the ink supply branch 05, bubbles are easily generated, and the generated bubbles enter the printing nozzle through the second ink storage cavity 021, so that the thickness of the printing film is uneven, and the printing quality of the inkjet printing device is reduced.
Disclosure of Invention
The embodiment of the invention provides an ink supply system, a control method thereof and an ink-jet printing device, which are used for solving the problem of uneven thickness of a printed film layer of the ink-jet printing device in the related art.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides an ink supply system, which includes a plurality of sub ink supply systems, and for each of the sub ink supply systems, the sub ink supply system includes a main ink supply device, a first ink supply path, an ink supply pump, and a control valve, the main ink supply device includes a first ink storage cavity, the first ink supply device includes a second ink storage cavity, a first end of the first ink supply path is communicated with the first ink storage cavity, a second end of the first ink supply path is used for being communicated with a printing nozzle of an inkjet printing device, and the ink supply pump, the second ink storage cavity, and the control valve are sequentially disposed on the first ink supply path along an ink supply direction.
Further, the first ink supply device further comprises at least one of a first pressure adjusting device and a first liquid level sensor, the first pressure adjusting device is used for adjusting the pressure in the second ink storage cavity, and the first liquid level sensor is used for measuring the liquid level height in the second ink storage cavity.
Further, in the case that the first ink supply device includes a first pressure adjustment device, the first pressure adjustment device includes a vacuum system and a connection pipe, a first end of the connection pipe is connected to the vacuum system, and a second end of the connection pipe is connected to the second ink storage chamber, so that a passage is formed between the second ink storage chamber and the vacuum system.
Further, the second end of the vacuum line is connected to the top of the second ink reservoir.
The printing device further comprises a second ink supply device and a second ink supply channel, wherein the first end of the second ink supply channel is communicated with the second ends of the plurality of first ink supply channels, and the second end of the second ink supply channel is used for being communicated with the printing spray head; the second ink supply device comprises a third ink storage cavity, the third ink storage cavity is positioned on the second ink supply passage, and the position of an ink inlet of the third ink storage cavity is lower than the position of an ink outlet of the second ink storage cavity; the ink inlet of the third ink storage cavity is communicated with the ink outlet of the second ink storage cavity through the second ink supply passage and the first ink supply passage.
Furthermore, the second ink supply device further includes at least one of a second pressure adjusting device and a second liquid level sensor, the second pressure adjusting device is used for adjusting the pressure in the third ink storage cavity, and the second liquid level sensor is used for measuring the liquid level height in the third ink storage cavity.
Further, the main ink supply device further includes a third pressure adjusting device for adjusting the pressure in the first ink storage chamber.
Furthermore, the third pressure regulating unit comprises an air source and a vent pipe, wherein a first end of the vent pipe is communicated with the air source, and a second end of the vent pipe is communicated with the first ink storage cavity.
In a second aspect, an embodiment of the present invention provides an inkjet printing apparatus, including a printing head and the ink supply system of the first aspect, in each of the sub ink supply systems, a second end of the first ink supply passage communicates with the printing head, and an ink outlet of the second ink storage chamber is located higher than the printing head; the ink outlet of the second ink storage cavity is communicated with the printing nozzle through the first ink supply passage.
Further, in the case where the ink supply system further includes a second ink supply device and a second ink supply passage, the position of the ink outlet of the third ink storage chamber is higher than that of the print head; and the ink outlet of the third ink storage cavity is communicated with the printing nozzle through the second ink supply passage.
In a third aspect, an embodiment of the present invention provides a method for controlling an ink supply system as described in the first aspect, including the steps of: when one of the sub ink supply systems supplies ink to the printing nozzle, at least one control valve of the sub ink supply system in other sub ink supply systems is closed, and an ink supply pump is opened until the liquid level in the second ink storage cavity corresponding to the ink supply pump reaches a preset value.
The ink supply system, the control method thereof and the ink-jet printing device provided by the embodiment of the invention have the advantages that the ink supply system comprises a plurality of sub ink supply systems, so that the plurality of sub ink supply systems can sequentially supply ink to the printing nozzle, when one sub ink supply system supplies ink to the printing nozzle, other sub ink supply systems can start the ink supply pump to pump the ink material from the first ink storage cavity to the second ink storage cavity for standing, bubbles generated by replacing the main ink supply device can be broken and eliminated in standing, and when other sub ink supply systems start to supply ink again, the ink after standing in the second ink storage cavity can enter the printing nozzle for printing, so that the phenomenon of uneven thickness of a printing film layer caused by the fact that the bubbles enter the printing nozzle can be avoided, and the printing quality of the ink-jet printing device can be improved; meanwhile, the ink in the sub ink supply system enters the second ink storage cavity to be stood when other sub ink supply systems normally supply ink to the printing nozzle, so that the time of normal work is not occupied when the ink enters the second ink storage cavity to be stood when the sub ink supply systems are switched to work, the printing continuity of the ink-jet printing device is ensured, and the work efficiency of the ink-jet printing device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an ink supply system of an inkjet printing apparatus in the related art;
fig. 2 is a schematic diagram of an ink supply system of an inkjet printing apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In a first aspect, an embodiment of the present invention provides an ink supply system, as shown in fig. 2, which includes a plurality of sub ink supply systems 10, and for each sub ink supply system 10, the sub ink supply system 10 includes a main ink supply device 1, a first ink supply device 2, a first ink supply path 3, an ink supply pump 4, and a control valve 5, where the main ink supply device 1 includes a first ink storage chamber 11, the first ink supply device 2 includes a second ink storage chamber 21, a first end of the first ink supply path 3 is communicated with the first ink storage chamber 11, a second end is used for being communicated with a printing nozzle (not shown in the figure) of an inkjet printing device, and the ink supply pump 4, the second ink storage chamber 21, and the control valve 5 are sequentially disposed on the first ink supply path 3 along an ink supply direction (i.e., a flow direction of ink in the first ink supply path 3).
The operation of the ink supply system is described below by taking the ink supply system including two sub ink supply systems 10 as an example: as shown in fig. 2, when the inkjet printing apparatus prints, the sub ink supply system 10a and the sub ink supply system 10b supply ink to the print head one by one, for example, the sub ink supply system 10a supplies ink to the print head first, that is, the ink supply pump 4 of the sub ink supply system 10a is opened, the control valve 5 is opened, and the ink material in the first ink storage chamber 11 of the main ink supply apparatus 1 enters the print head through the ink supply pump 4, the second ink storage chamber 21 of the first ink supply apparatus 2, and the control valve 5; when the ink material of the main ink supply device 1 in the sub ink supply system 10a is used up, the sub ink supply system 10a stops supplying ink to the printing nozzle, that is, the ink supply pump 4 of the sub ink supply system 10a is closed, and the control valve 5 is closed; then, the sub ink supply system 10b starts supplying ink to the printing nozzle, that is, the ink supply pump 4 of the sub ink supply system 10b is opened, the control valve 5 is opened, meanwhile, the main ink supply device 1 with the used up ink material in the sub ink supply system 10a is replaced with the main ink supply device 1 with the ink material, after the replacement is completed, the ink supply pump 4 of the sub ink supply system 10a is opened, the control valve 5 is still closed to pump the ink material into the second ink storage cavity 21 until the liquid level reaches the preset value, then the ink supply pump 4 of the sub ink supply system 10a is closed, the ink material is kept still in the second ink storage cavity 21 of the sub ink supply system 10a, so that the air bubbles generated by replacing the main ink supply device 1 can be broken and eliminated in the still standing process until the sub ink supply system 10a starts supplying ink to the printing nozzle again, and then the sub ink supply system 10b also adopts the same steps as the sub ink supply system 10, and circulating until the ink jet printing device finishes printing.
The ink supply system provided by the embodiment of the invention comprises a plurality of sub ink supply systems 10, so that the plurality of sub ink supply systems 10 can sequentially supply ink to the printing nozzles, when one sub ink supply system 10 supplies ink to the printing nozzles, other sub ink supply systems 10 can start the ink supply pump 4 to pump ink materials from the first ink storage cavity 11 to the second ink storage cavity 21 for standing, so that bubbles generated by replacing the main ink supply device 1 can be broken and eliminated in standing, when the other sub ink supply systems 10 start to supply ink again, the ink after standing in the second ink storage cavity 21 can enter the printing nozzles for printing, and therefore, the phenomenon of uneven thickness of a printing film layer caused by the fact that the bubbles enter the printing nozzles can be avoided, and the printing quality of the ink jet printing device can be improved;
meanwhile, because the ink in the sub ink supply system 10 enters the second ink storage cavity 21 to be kept static during the period that other sub ink supply systems 10 normally supply ink to the printing nozzle, when the sub ink supply system 10 is switched to work, the ink enters the second ink storage cavity 21 to be kept static, so that the normal working time is not occupied, the printing continuity of the ink-jet printing device is ensured, and the working efficiency of the ink-jet printing device is improved;
in addition, the ink supply system eliminates air bubbles in the ink in a mode that the ink is kept still during the operation of one sub ink supply system 10, so that when the operation is switched among the sub ink supply systems 10, the air bubbles do not need to be eliminated in a mode of discharging the ink with the air bubbles, ink needed by printing is saved, and the cost of printing the ink is reduced.
It should be noted that: (1) in order to ensure that the ink in the second ink storage cavity 21 of the first ink supply device 2 can smoothly enter the printing nozzle in each sub ink supply system 10, the position of the ink outlet of the second ink storage cavity 21 can be higher than that of the printing nozzle, so that the ink from the ink outlet of the second ink storage cavity 21 can enter the printing nozzle under the action of gravity; (2) the elimination of air bubbles in the sub ink supply system 10 that supplies ink to the printing head first can be solved by discharging the ink with air bubbles or standing for a while when the ink supply system of the inkjet printing apparatus is just starting to operate.
In the process of supplying ink by the sub ink supply system 10, since the ink supply pump 4 needs to deliver ink to the second ink storage cavity 21 of the first ink supply device 2, the gas in the first ink supply path 3 is also delivered to the second ink storage cavity 21 in the process of delivering ink, so that the pressure in the second ink storage cavity 21 can be increased, and in order to balance the pressure of the second ink storage cavity 21 with the external environment, as shown in fig. 2, the first ink supply device 2 further includes a first pressure adjusting device 22, and the first pressure adjusting device 22 is used for adjusting the pressure in the second ink storage cavity 21. By arranging the first pressure adjusting device 22, the pressure in the second ink storage cavity 21 can be adjusted in the process that the ink supply pump 4 conveys ink to the second ink storage cavity 21, so that the air pressure of the second ink storage cavity 21 and the outside is balanced, and the ink is ensured to be conveyed to the printing nozzle smoothly.
The first pressure adjusting device 22 is not limited to a single structure, for example, as shown in fig. 2, the first pressure adjusting device 22 may include a vacuum system 221 (e.g., a vacuum pump, etc.) and a connecting pipe 222, a first end of the connecting pipe 222 is connected to the vacuum system 221, and a second end of the connecting pipe is connected to the second ink storage chamber 21, so that a passage is formed between the second ink storage chamber 21 and the vacuum system 221. When the pressure in the second ink storage chamber 21 is higher, the vacuum system 221 is turned on to partially pump out the gas in the second ink storage chamber 21, so that the second ink storage chamber 21 is balanced with the external air pressure. In addition, the first pressure adjusting device 22 may also include a pressure balancing valve, the pressure balancing valve is disposed on the first ink supplying device 2, and when the pressure in the second ink storing cavity 21 reaches a preset pressure value, the pressure balancing valve is opened to communicate the second ink storing cavity 21 with the outside, so that the air pressure of the second ink storing cavity 21 is balanced with the outside. Compared with the embodiment in which the first pressure regulating device 22 includes the pressure balance valve, the embodiment in which the first pressure regulating device 22 includes the vacuum system 221 and the connecting pipeline 222, the vacuum system 221 can regulate the pressure in the second ink storage chamber 21 in a wider range, and a slightly negative pressure state can be maintained in the second ink storage chamber 21, so that the ink supply pump 4 can pump the ink into the second ink storage chamber 21 more easily.
In the embodiment where the first pressure adjusting device 22 includes the vacuum system 221 and the connection pipe 222, the position where the second end of the connection pipe 222 is connected to the second ink reservoir 21 is also not exclusive, and for example, as shown in fig. 2, the second end of the connection pipe 222 may be connected to the top of the second ink reservoir 21. In addition, the second end of the connection pipe 222 may also be connected to the middle of the second ink reservoir 21 in the height direction thereof. Compared with the embodiment in which the second end of the connecting pipeline 222 is connected with the middle of the second ink storage cavity 21 along the height direction, and the embodiment in which the second end of the connecting pipeline 222 is connected with the top of the second ink storage cavity 21, in the process of delivering ink to the second ink storage cavity 21 by the ink supply pump 4, the gas outlet at the joint between the second end of the connecting pipeline 222 and the second ink storage cavity 21 is difficult to be submerged by the liquid level of the ink, so that the volume of the second ink storage cavity 21 for containing the ink is not limited by the joint between the second end and the second ink storage cavity 21, and the ink storage amount of the second ink storage cavity 21 is improved.
In order to facilitate the control of the volume of ink in the second ink storage chamber 21 during the ink supply process of the sub ink supply system 10 to the printing nozzle, as shown in fig. 2, the first ink supply device 2 further includes a first liquid level sensor 23, and the first liquid level sensor 23 is used for measuring the liquid level in the second ink storage chamber 21. When the liquid level in the second ink storage cavity 21 is higher than the preset upper limit value, the ink supply pump 4 can be turned off to stop supplying ink into the second ink storage cavity 21; when the liquid level in the second ink storage cavity 21 is lower than the preset lower limit value, the ink supply pump 4 can be started to convey ink into the second ink storage cavity 21. The liquid level in the second ink storage cavity 21 can be controlled to fluctuate within a preset range by arranging the first liquid level sensor 23, so that the ink in the second ink storage cavity 21 is prevented from being too much or too little.
As shown in fig. 2, the first liquid level sensor 23 may include a plurality of (e.g., 3) first sub liquid level sensors 231, and the plurality of first sub liquid level sensors 231 are all disposed in the second ink storage cavity 21 and located at different heights, so that when the liquid level in the second ink storage cavity 21 reaches the first sub liquid level sensors 231 at different positions, the first sub liquid level sensors 231 at the positions can generate electric signals to accurately obtain the liquid level height in the second ink storage cavity 21.
In the ink supply system provided by the embodiment of the present invention, the first ink supply device 2 may include the first pressure adjustment device 22, but does not include the first liquid level sensor 23; a first level sensor 23 may also be included, excluding the first pressure regulating device 22; in addition, both the first pressure regulating device 22 and the first liquid level sensor 23 may be included, which may be set according to practical situations and are not specifically limited herein.
In the ink supply system provided by the embodiment of the invention, the second end of the first ink supply passage 3 of each sub ink supply system 10 can be directly connected with the printing nozzle; in addition, the second end of the first ink supply path 3 of each sub ink supply system 10 may be indirectly connected with the printing nozzle, and as shown in fig. 2 in particular, the ink supply system may further include a second ink supply device 6 and a second ink supply path 7, the first end of the second ink supply path 7 is communicated with the second ends of the plurality of first ink supply paths 3, and the second end of the second ink supply path 7 is used for being communicated with the printing nozzle; the second ink supply device 6 includes a third ink storage cavity 61, the third ink storage cavity 61 is located on the second ink supply path 7, the position of the ink inlet of the third ink storage cavity 61 is lower than that of the ink outlet of the second ink storage cavity 21, and the ink inlet of the third ink storage cavity 61 is communicated with the ink outlet of the second ink storage cavity 21 through the second ink supply path 7 and the first ink supply path 3. The reason why the position of the ink inlet of the third ink storage chamber 61 is lower than the position of the ink outlet of the second ink storage chamber 21 is to ensure that the ink in the second ink storage chamber 21 can smoothly enter the third ink storage chamber 61 under the action of gravity after the ink supply pump 4 stops working. Compared with the embodiment that the second end of the first ink supply passage 3 of each sub ink supply system 10 is directly connected with the printing nozzle, and the embodiment that the second end of the first ink supply passage 3 of each sub ink supply system 10 is indirectly connected with the printing nozzle, because the second ink supply device 6 is arranged between the second end of the first ink supply passage 3 and the printing nozzle, the third ink storage cavity 61 of the second ink supply device 6 can play a role of intermediate buffering, the impact of the ink delivered by the ink supply pump 4 from the second ink storage cavity 21 to the printing nozzle is reduced, and the normal ink jet of the printing nozzle is ensured.
In order to balance the pressure of the third ink storage chamber 61 with the external environment, as shown in fig. 2, the second ink supply device 6 further includes a second pressure adjusting device 62, and the second pressure adjusting device 62 is used for adjusting the pressure in the third ink storage chamber 61, when the ink is supplied by the sub ink supply system 10, the pressure in the third ink storage chamber 61 changes when the ink enters the third ink storage chamber 61 or when the ink is discharged from the third ink storage chamber 61. Through the arrangement of the second pressure adjusting device 62, the pressure in the third ink storage cavity 61 can be adjusted in the process of conveying ink to the third ink storage cavity 61, so that the third ink storage cavity 61 is balanced with the external air pressure, and the ink is guaranteed to be conveyed to the printing nozzle smoothly.
The structure of the second pressure adjusting device 62 is not exclusive, for example, as shown in fig. 2, the second pressure adjusting device 62 may include an air pump 621 and a pipeline 622, a first end of the pipeline 622 is connected to the air pump 621, and a second end of the pipeline 622 is connected to the third ink storage chamber 61, so that a passage is formed between the third ink storage chamber 61 and the air pump 621. When the pressure in the third ink storage cavity 61 is higher, the air pump 621 is turned on to pump a part of the air in the third ink storage cavity 61, so that the air pressure of the third ink storage cavity 61 is balanced with the external air pressure; when the pressure in the third ink storage chamber 61 is small, the air pump 621 is turned on to input a part of air into the third ink storage chamber 61, so that the air pressure of the third ink storage chamber 61 is balanced with the external air pressure. In addition, the second pressure adjusting device 62 may also include a pressure balancing valve, the pressure balancing valve is disposed on the second ink supply device 6, and when the pressure in the third ink storage chamber 61 reaches a preset pressure value, the pressure balancing valve is opened to communicate the third ink storage chamber 61 with the outside, so that the air pressure of the third ink storage chamber 61 is balanced with the outside. Compared with the embodiment in which the second pressure adjusting device 62 includes the pressure balance valve, the embodiment in which the second pressure adjusting device 62 includes the air pump 621 and the pipeline 622, the air pump 621 can adjust the pressure in the third ink storage chamber 61 in a wider range, and can maintain the proper pressure in the third ink storage chamber 61, thereby facilitating the ink entering into the third ink storage chamber 61 or the ink discharging from the third ink storage chamber 61.
In order to facilitate the control of the volume of ink in the third ink storage chamber 61 during the ink supply process of the sub ink supply system 10 to the printing head, as shown in fig. 2, the second ink supply device 6 further includes a second liquid level sensor 63, and the second liquid level sensor 63 is used for measuring the liquid level in the third ink storage chamber 61. When the liquid level in the third ink storage cavity 61 is higher than the preset upper limit value, the control valve 5 may be closed to stop the ink from being delivered into the third ink storage cavity 61; when the liquid level in the third ink storage cavity 61 is lower than the preset lower limit value, the control valve 5 can be opened to feed ink into the third ink storage cavity 61. The liquid level in the third ink storage cavity 61 can be controlled to fluctuate within a preset range by arranging the second liquid level sensor 63, so that the ink amount in the third ink storage cavity 61 is prevented from being too much or too little, and the ink amount entering the printing nozzle can be accurately controlled.
As shown in fig. 2, the second liquid level sensor 63 may include a plurality of (e.g. 4) second sub liquid level sensors 631, and the plurality of second sub liquid level sensors 631 are disposed in the third ink storage cavity 61 and located at different heights, so that when the liquid level in the third ink storage cavity 61 reaches the second sub liquid level sensors 631 at different positions, the second sub liquid level sensors 631 at the positions can generate electric signals to accurately obtain the liquid level in the third ink storage cavity 61.
In the ink supply system provided by the embodiment of the present invention, the second ink supply device 6 may include a second pressure adjustment device 62, which does not include the second liquid level sensor 63; a second fluid level sensor 63 may also be included, excluding the second pressure regulating device 62; in addition, both the second pressure adjusting device 62 and the second liquid level sensor 63 may be included, which may be set according to practical situations and are not specifically limited herein.
In the process of supplying ink by the sub ink supply system 10, since the ink supply pump 4 pumps out the ink in the first ink storage cavity 11 of the main ink supply device 1, the gas in the first ink storage cavity 11 will also be pumped out in the process of pumping out the ink, so that the pressure in the first ink storage cavity 11 is reduced, and in order to balance the pressure of the first ink storage cavity 11 with the outside, as shown in fig. 2, the main ink supply device 1 further includes a third pressure adjusting device 12, and the third pressure adjusting device 12 is used for adjusting the pressure in the first ink storage cavity 11. Thus, the pressure in the first ink storage chamber 11 can be adjusted during the process of pumping ink from the first ink storage chamber 11 by the ink supply pump 4, so that the air pressure of the first ink storage chamber 11 and the outside is balanced, thereby ensuring that the ink is smoothly pumped out from the first ink storage chamber 11.
The third pressure regulating device 12 is not limited in structure, and for example, as shown in fig. 2, the third pressure regulating device 12 may include a gas source 121 and a vent pipe 122, and a first end of the vent pipe 122 is communicated with the gas source 121 and a second end is communicated with the first ink storage chamber 11. When the pressure in the first ink storage chamber 11 is low, the gas source 121 is opened to input a part of gas into the first ink storage chamber 11, so that the pressure of the first ink storage chamber 11 is balanced with the external pressure. In addition, the third pressure adjusting device 12 may also include a pressure balancing valve, the pressure balancing valve is disposed on the main ink supply device 1, and when the pressure in the first ink storage chamber 11 is lower than a preset pressure value, the pressure balancing valve is opened to communicate the first ink storage chamber 11 with the outside, so that the air pressure of the first ink storage chamber 11 is balanced with the outside. In contrast to embodiments in which third pressure regulating device 12 includes a pressure balancing valve, and embodiments in which third pressure regulating device 12 includes air source 121 (e.g., an air pump) and conduit 622, air source 121 may regulate the pressure within first ink reservoir 11 to a greater extent, which may maintain a suitable pressure within first ink reservoir 11, thereby facilitating the withdrawal of ink from first ink reservoir 11.
In the ink supply system provided in the embodiment of the present invention, the main ink supply device 1 may be an ink supply tank, or may be another ink supply container, which is not specifically limited herein; the first ink supply device 2 may be an ink supply tank, or may be another ink supply container, and is not particularly limited herein; the second ink supply device 6 may be an ink supply tank, or may be another ink supply container, and is not limited in particular herein.
In a second aspect, an embodiment of the present invention provides an inkjet printing apparatus, as shown in fig. 2, including a printing head and the ink supply system described in the first aspect, in each sub ink supply system 10, a second end of the first ink supply path 3 communicates with the printing head, and an ink outlet of the second ink storage chamber 21 is located higher than the printing head; wherein, the ink outlet of the second ink storage cavity 21 is communicated with the printing nozzle through the first ink supply passage 3.
The technical problems and the technical effects solved by the inkjet printing apparatus according to the embodiments of the present invention are the same as the technical problems and the technical effects solved by the ink supply system in the first aspect, and are not repeated herein.
In the case where the ink supply system further includes the second ink supply device 6 and the second ink supply path 7, as shown in fig. 2, the ink outlet of the third ink storage chamber 61 is positioned higher than the print head; by so doing, the ink in the third ink reservoir 61 can smoothly enter the print head by gravity, so that no additional energy is consumed.
Wherein, the ink outlet of the third ink storage cavity 61 is communicated with the printing nozzle through the second ink supply passage 7.
In a third aspect, an embodiment of the present invention provides a method for controlling an ink supply system as described in the first aspect, including the steps of: the plurality of sub ink supply systems 10 supply ink to the printing nozzles one by one; for example, as shown in fig. 2, the sub ink supply system 10a and the sub ink supply system 10b supply ink to the printing nozzles one by one, and when the sub ink supply system 10a stops supplying ink, the sub ink supply system 10b starts supplying ink; when the sub ink supply system 10b stops supplying ink, the sub ink supply system 10a starts supplying ink, and the process is repeated until printing is finished.
When one of the sub-ink-supply systems 10 supplies ink to the printing nozzle, in each of the other sub-ink-supply systems 10, the control valve 5 of at least one (one or more) sub-ink-supply system 10 is closed, and the ink-supply pump 4 is opened until the liquid level in the second ink-storage chamber 21 corresponding to the ink-supply pump 4 reaches a preset value; for example, as shown in fig. 2, when the sub ink supply system 10a supplies ink to the printing head, the control valve 5 of the sub ink supply system 10b is closed and the ink supply pump 4 is opened until the liquid level in the second ink storage chamber 21 of the sub ink supply system 10b reaches a preset value, so that the ink is allowed to stand in the second ink storage chamber 21 to eliminate bubbles.
The technical problems and the technical effects solved by the control method of the ink supply system according to the embodiment of the present invention are the same as the technical problems and the technical effects solved by the ink supply system according to the first aspect, and are not repeated herein.
The same or similar features in the embodiment of the method for controlling an ink supply system as those in the embodiment of the apparatus of the ink supply system may be referred to the description of the embodiment of the apparatus of the ink supply system, and are not repeated herein.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An ink supply system is characterized by comprising a plurality of sub ink supply systems, wherein each sub ink supply system comprises a main ink supply device, a first ink supply passage, an ink supply pump and a control valve;
the printing head further comprises a second ink supply device and a second ink supply channel, wherein the first end of the second ink supply channel is communicated with the second ends of the plurality of first ink supply channels, and the second end of the second ink supply channel is used for being communicated with the printing head; the second ink supply device comprises a third ink storage cavity, the third ink storage cavity is positioned on the second ink supply passage, and the position of an ink inlet of the third ink storage cavity is lower than the position of an ink outlet of the second ink storage cavity;
the ink inlet of the third ink storage cavity is communicated with the ink outlet of the second ink storage cavity through the second ink supply passage and the first ink supply passage.
2. The ink supply system of claim 1, wherein the first ink supply further includes at least one of a first pressure regulator for regulating pressure in the second ink reservoir, and a first level sensor for measuring a level of liquid in the second ink reservoir.
3. The ink supply system of claim 2, wherein, in the case where the first ink supply includes a first pressure regulating device, the first pressure regulating device includes a vacuum system and a connecting pipe, a first end of the connecting pipe is connected to the vacuum system, and a second end of the connecting pipe is connected to the second ink storage chamber, so that a passage is formed between the second ink storage chamber and the vacuum system.
4. The ink supply system of claim 3, wherein a second end of the connecting conduit is connected to a top of the second ink reservoir.
5. The ink supply system of claim 1, wherein the second ink supply further includes at least one of a second pressure regulating device for regulating pressure in the third ink reservoir, and a second liquid level sensor for measuring a liquid level within the third ink reservoir.
6. The ink supply system according to any one of claims 1 to 4, wherein the main ink supply device further includes a third pressure adjusting device for adjusting a pressure in the first ink storage chamber.
7. The ink supply system of claim 6, wherein the third pressure regulating unit includes an air supply and a vent tube, a first end of the vent tube being in communication with the air supply and a second end being in communication with the first ink reservoir.
8. An inkjet printing apparatus comprising a printing head and the ink supply system according to any one of claims 1 to 7, wherein in each of the sub ink supply systems, a second end of the first ink supply path communicates with the printing head, and an ink outlet of the second ink storage chamber is located higher than the printing head;
the ink outlet of the second ink storage cavity is communicated with the printing nozzle through the first ink supply passage;
under the condition that the ink supply system further comprises a second ink supply device and a second ink supply passage, the position of an ink outlet of the third ink storage cavity is higher than that of the printing nozzle;
and the ink outlet of the third ink storage cavity is communicated with the printing nozzle through the second ink supply passage.
9. An ink supply system control method as claimed in any one of claims 1 to 7, characterized by comprising the steps of: when one of the sub ink supply systems supplies ink to the printing nozzle, at least one control valve of the sub ink supply system in other sub ink supply systems is closed, and an ink supply pump is opened until the liquid level in the second ink storage cavity corresponding to the ink supply pump reaches a preset value.
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| CN115214237A (en) * | 2021-04-21 | 2022-10-21 | 上海锐尔发数码科技有限公司 | Automatic color-mixing spray-painting system and method |
| CN113910778B (en) * | 2021-09-24 | 2022-11-22 | 新印科技股份有限公司 | Control method of ink supply pipeline of printer |
| CN113910777B (en) * | 2021-09-24 | 2022-11-04 | 新印科技股份有限公司 | Ink supply system of ink-jet printer |
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| ATE402017T1 (en) * | 2001-02-09 | 2008-08-15 | Seiko Epson Corp | INKJET RECORDING APPARATUS, CONTROL AND INK REFILLING METHODS PERFORMED IN THE APPARATUS, INK SUPPLY SYSTEM IN THE APPARATUS, AND METHODS OF MANAGEMENT OF THE QUANTITY OF INK SUPPORTED BY THE SYSTEM |
| CN2528618Y (en) * | 2002-03-21 | 2003-01-01 | 深圳市润天智图像技术有限公司 | Ink way negative pressure system of ink-jet drawing machine |
| JP4617657B2 (en) * | 2003-10-14 | 2011-01-26 | コニカミノルタホールディングス株式会社 | Pressure adjustment method by damper structure |
| CN102717601B (en) * | 2012-06-29 | 2014-08-20 | 珠海天威飞马打印耗材有限公司 | Ink filling device and ink filling method |
| JP5777581B2 (en) * | 2012-08-10 | 2015-09-09 | 株式会社ミヤコシ | Inkjet recording device |
| WO2015050244A1 (en) * | 2013-10-05 | 2015-04-09 | 武蔵エンジニアリング株式会社 | Method and device for filling of liquid material |
| CN106626790A (en) * | 2016-11-07 | 2017-05-10 | 宁波法赫施标识科技有限公司 | Full automatic function control module of jet head ink path system |
| JP6686173B2 (en) * | 2016-11-24 | 2020-04-22 | ローランドディー．ジー．株式会社 | Ink supply system and inkjet printer |
| CN206335986U (en) * | 2016-12-27 | 2017-07-18 | 浙江东山广信数码印花设备有限公司 | It is adapted to the digital decorating machine of different inks |
| CN107128078A (en) * | 2017-05-26 | 2017-09-05 | 深圳诚拓数码设备有限公司 | The positive and negative pressure control system of print cartridge |
| CN207669998U (en) * | 2017-12-15 | 2018-07-31 | 杭州印校印务有限公司 | Automatically supplying ink system |
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