CN106799894B - Ink feeding system - Google Patents
Ink feeding system Download PDFInfo
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- CN106799894B CN106799894B CN201510845022.2A CN201510845022A CN106799894B CN 106799894 B CN106799894 B CN 106799894B CN 201510845022 A CN201510845022 A CN 201510845022A CN 106799894 B CN106799894 B CN 106799894B
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- ink
- pressure
- spray head
- print cartridge
- secondary print
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Links
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 239000007921 spray Substances 0.000 claims description 78
- 238000007872 degassing Methods 0.000 claims description 22
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Ink Jet (AREA)
Abstract
本发明提供一种供墨系统，包括主墨桶、进墨泵、次级墨盒、第一回墨阀、各喷头、与每个喷头对应的供墨阀和控制器；次级墨盒中安装第一压力检测装置，各喷头处安装对应的第二压力检测装置；控制器根据述第一压力检测装置检测的压力和每个喷头所需的稳定压力，分别对进墨泵进行功率控制，以使次级墨盒中分别产生与各稳定压力对应的恒定供墨压力；控制器在某第二压力检测装置检测的压力不满足对应喷头所需的稳定压力时，控制对应的供墨阀打开，在该第二压力检测装置检测的压力满足对应喷头所需的稳定压力时，控制对应的供墨阀关闭。通过压力检测和对次级墨盒的恒压控制，无需为每个喷头配置对应的气路控制，实现简单、安全可靠。
The invention provides an ink supply system, comprising a main ink tank, an ink feed pump, a secondary ink cartridge, a first ink return valve, each nozzle, an ink supply valve corresponding to each nozzle, and a controller; A pressure detection device, a corresponding second pressure detection device is installed at each nozzle; the controller controls the power of the ink feed pump according to the pressure detected by the first pressure detection device and the stable pressure required by each nozzle, so that the A constant ink supply pressure corresponding to each stable pressure is generated in the secondary ink cartridges; when the pressure detected by a second pressure detection device does not meet the stable pressure required by the corresponding nozzle, the controller controls the corresponding ink supply valve to open, and the controller opens the corresponding ink supply valve. When the pressure detected by the second pressure detection device satisfies the stable pressure required by the corresponding print head, the corresponding ink supply valve is controlled to be closed. Through pressure detection and constant pressure control of the secondary ink cartridge, there is no need to configure corresponding air circuit control for each nozzle, which is simple, safe and reliable.
Description
Technical field
The invention belongs to digital printing technologies fields, more particularly, to a kind of ink feeding system.
Background technique
The gravity ink supply mode ink feed techniques more mature as one kind for inkjet print head ink supply, give nozzle printing skill
It is brought in terms of the stability of art and greatly helps and reform.At the same time, the work of the control mode to match with ink feed techniques
It is become more and more important with also seeming.
Currently, a kind of common ink supply control mode is, it is based on gas circuit negative pressure generating device corresponding with each spray head, is produced
A raw subnormal ambient, thus to guarantee that ink is flowed through from corresponding spray head, while guaranteeing the ink flow rate needed at spray head
And pressure.
Due to largely having used gas pressure to carry out ink supply control in above-mentioned ink feeding system, so there is a large amount of in system
Gas circuit, at least each spray head is corresponding with a gas circuit, and structure is complex, meanwhile, the introduction of a large amount of gas circuits leads to ink supply system
The reliability of system substantially reduces, once problem occurs for the device of some control liquid or gas, all most likely results in ink
Into the gas circuit of control negative pressure, to cause irremediable destruction.
Summary of the invention
In view of the above problems, the present invention provides a kind of ink feeding system, for overcoming a large amount of negative pressure gas circuits to be easy to lead
The defect for causing ink feeding system poor reliability, complexity high.
The present invention provides a kind of ink feeding systems, comprising:
Main ink bucket, ink feed pump, secondary print cartridge, first time black valve, at least one spray head, ink supply valve corresponding with each spray head
And controller；
The ink outlet port of the main black bucket connect with the ink entrance that the ink feed pump, the ink outlet port that the ink feed pumps with it is described secondary
First ink outlet port of the ink entrance connection of grade print cartridge, the secondary print cartridge accesses the main black bucket by described first time black valve,
Each second ink outlet port of the secondary print cartridge is correspondingly connected with by ink supply valve corresponding with each spray head with each spray head respectively；
First pressure detection device is installed in the secondary print cartridge, corresponding second pressure is installed at each spray head
Detection device；
The controller is steady needed for the pressure and each spray head for being detected according to the first pressure detection device
Constant-pressure pumps the ink feed carry out power control respectively, so as to generate and each steady pressure pair respectively in the secondary print cartridge
The constant ink delivery pressure answered；
The controller is also used to be unsatisfactory for corresponding spray head institute in the pressure of any second pressure detection device detection
It when the steady pressure needed, controls corresponding ink supply valve and opens, meet in the pressure of any second pressure detection device detection
When steady pressure needed for corresponding spray head, controls corresponding ink supply valve and close.
Ink feeding system provided by the invention, by setting for detect the first pressure detection device of secondary print cartridge pressure with
And each second pressure detection device for detecting pressure at each spray head, the pressure of secondary print cartridge and each spray head can be got in real time
Power situation, and then according to for ink delivery pressure needed for guaranteeing each spray head steady operation, realize the ink feed for being directed to each spray head respectively
Pump power control, and for the switch control of the corresponding ink supply valve of each spray head.In this way, pressure does not meet stabilization at spray head
In the case where steady pressure needed for working, by controlling ink feed pump power, so that secondary print cartridge maintenance meets the steady pressure institute
The constant-pressure conditions needed, and control and open corresponding ink supply valve to spray head progress ink supply, to guarantee the steady pressure at the spray head.
In the program, the realization of ink supply control is based on above-mentioned pressure detecting and to carry out Isobarically Control as a result, being not necessarily to secondary print cartridge
For the corresponding gas circuit control of each showerhead configurations, a large amount of gas circuit structure is avoided, is realized simple, safe and reliable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of ink feeding system embodiment one provided by the invention；
Fig. 2 is the structural schematic diagram of ink feeding system embodiment two provided by the invention.
Specific embodiment
Fig. 1 is the structural schematic diagram of ink feeding system embodiment one provided by the invention, and arrow direction indicates ink in figure
Flow direction.As shown in Figure 1, the ink feeding system includes:
Main ink bucket 11, ink feed pump 12,13, first times black valves 14 of secondary print cartridge, at least one spray head 15 and each spray head pair
Ink supply valve 16, the controller 17 answered.
The ink outlet port of main ink bucket 11 is connect with the ink entrance of ink feed pump 12, the ink outlet port of ink feed pump 12 and secondary print cartridge 13
Ink entrance connection, the first ink outlet port a of secondary print cartridge 13 access main black bucket 11 by first time black valve 14, secondary print cartridge 13 it is each
Second ink outlet port b is correspondingly connected with by ink supply valve 16 corresponding with each spray head 15 with each spray head 15 respectively.
It is worth noting that the junction between above-mentioned each device is all sealing in the present embodiment, let out to avoid ink
Dew.
In practical applications, in order to work normally ink feeding system, need to guarantee that each spray head 15 is in stable pressure
Under the conditions of ink flow rate.As shown in Figure 1, the ink supply to each spray head may be implemented in secondary print cartridge 13.In general, each spray head
15 for secondary print cartridge 13, and position is higher, and height of each spray head 15 apart from secondary print cartridge 13 may be equal or different,
Therefore, in order to guarantee that the different steady pressures at each spray head, secondary print cartridge 13 need to generate different constant ink delivery pressures, with
Ink is headed into each corresponding spray head.
For this purpose, first pressure detection device 131 is equipped in secondary print cartridge 13 in the present embodiment, at each spray head 15
Corresponding second pressure detection device 151 is installed.For the pressure condition at real-time detection secondary print cartridge 13 and each spray head 15,
So that controller 17 generates ink supply corresponding with each spray head to the pressure in secondary print cartridge 13 in time according to pressure sensing result
Valve 16 is controlled, and guarantees that pressure is stablized at each spray head 15.
Wherein, above-mentioned first pressure detection device 131 and each second pressure detection device 151 can be pressure sensor,
Its testing principle belongs to the prior art, repeats no more in the present embodiment.
Controller 17 generates ink supply valve corresponding with each spray head to the pressure in secondary print cartridge 13 according to pressure sensing result
16 are controlled, and can be accomplished in that
Stablize pressure needed for pressure and each spray head 15 that controller 17 is detected according to first pressure detection device 131
Power carries out power control to ink feed pump 12 respectively, so as to generate respectively in secondary print cartridge 13 corresponding with each steady pressure constant
Ink delivery pressure.
Controller 17 stablizes pressure needed for being unsatisfactory for corresponding spray head in the pressure that any second pressure detection device 151 detects
It when power, controls corresponding ink supply valve 16 and opens, meet corresponding spray head institute in the pressure of any second pressure detection device 151 detection
When the steady pressure needed, controls corresponding ink supply valve 16 and close.
First pressure detection device 131 and each second pressure detection device 151 can be configured as between the very short time
Every the pressure being periodically detected at secondary print cartridge 13 and corresponding spray head 15, it will test result and be sent to controller 17.Controller 17
Corresponding control processing is carried out based on the testing result.
Specifically, for for some spray head 15, when ink feeding system initialization, the spray head is stored in controller 17
15 corresponding constant ink delivery pressure values, the constant ink delivery pressure value can be the height previously according to the spray head 15 apart from secondary print cartridge
What steady pressure needed for degree difference and 15 steady operation of spray head was determined.To, in ink feeding system initialization, control
Device 17 controls the power of ink feed pump 12 according to the corresponding constant ink delivery pressure value of the spray head 15, so that the pressure in secondary print cartridge 13
Force environment meets the requirement of the constant ink delivery pressure.
It is that some above-mentioned spray head 15 is provided needed for the steady pressure of steady operation that pressure in secondary print cartridge 13, which meets,
When constant-pressure conditions, controller 17 controls the corresponding ink supply valve 16 of spray head 15 and opens, so that the ink in secondary print cartridge 13 passes through
The constant ink delivery pressure heads into spray head 15, and steady pressure and ink flow rate needed for it are formed at spray head 15.
Wherein, controller 17 be in the secondary print cartridge 13 detected according to first pressure detection device 131 current pressure with
And the corresponding constant ink delivery pressure of above-mentioned spray head 15, power controls are carried out to ink feed pump 12, that is, according to the two pressure
Difference, determine that ink feed pump 12 should operate with which type of power, so as to generate the constant ink delivery pressure in secondary print cartridge 13.
It is worth noting that in ink feeding system initialization, under conditions of there are multiple spray head 15, respectively for every
A spray head 15 carries out above-mentioned ink supply control treatment process.When initial, all ink supply valves 16 are closed, and are successively directed to each spray head 15
It carries out above-mentioned ink supply control treatment process and controls corresponding ink supply valve when meeting the constant ink delivery pressure of a spray head 15
16 open, and successively handle, until all spray heads are all disposed.
Still with any spray head 15 for, after initial ink supply treatment process, which give the confessions of the ink of steady pressure
It gives, at this point, the pressure value that second pressure detection device 151 corresponding with the spray head 15 detects is matched with the steady pressure value,
Trigger controller 17 closes corresponding ink supply valve 16, with the work of the spray head 15, ink consumption, when second pressure detection device
When steady pressure needed for the pressure of 151 detections is unsatisfactory for the spray head 15, trigger controller 17 opens corresponding ink supply valve 16, together
When, trigger controller 17 carries out handling for the ink supply control of the spray head again, i.e. the power of control ink feed pump 12, so that secondary
Pressure in print cartridge 13 meets the corresponding constant ink delivery pressure requirement of the spray head, carries out ink supply to the spray head again.
In the present embodiment, by being arranged for detecting the first pressure detection device of secondary print cartridge pressure and for detecting
Each second pressure detection device of pressure, can get the pressure condition of secondary print cartridge and each spray head in real time at each spray head, into
And according to for ink delivery pressure needed for guaranteeing each spray head steady operation, realize the ink feed pump power control for being directed to each spray head respectively
System, and for the switch control of the corresponding ink supply valve of each spray head.In this way, pressure is not met needed for steady operation at spray head
In the case where steady pressure, by controlling ink feed pump power, so that secondary print cartridge maintains constant pressure needed for meeting the steady pressure
Condition, and control and open corresponding ink supply valve to spray head progress ink supply, to guarantee the steady pressure at the spray head.The program
In, the realization of ink supply control is based on above-mentioned pressure detecting and to carry out Isobarically Control to secondary print cartridge as a result, without being each
The corresponding gas circuit control of showerhead configurations, avoids a large amount of gas circuit structure, realizes simple, safe and reliable.
Fig. 2 is the structural schematic diagram of ink feeding system embodiment two provided by the invention, as shown in Fig. 2, implementation shown in Fig. 1
On the basis of example, the ink feeding system further include: return pump 21, second times black valves 22.
Wherein, the third ink outlet port c of secondary print cartridge 13 is connect with the ink entrance for returning pump 21, and the ink outlet port for returning pump 21 is logical
It crosses second time black valve 22 and accesses main black bucket 11.
Controller 17 is also used in ink feeding system initial launch, if the first pressure detection device 131 received detects
It is unsatisfactory for the instruction of initial pressure to the pressure in secondary print cartridge 13, then controls back pump 21 with predetermined power for secondary print cartridge 13
In ink extraction, flowed into main black bucket 11 by second time black valve 33, so that the pressure in secondary print cartridge 13 meets initial pressure
Power.
In general, before ink feeding system initial launch, the quantity of ink stored in secondary print cartridge 13 may be relatively more, accordingly
, gas flow is fewer, thus, the gas pressure in secondary print cartridge 13 is smaller.If in this, as primary condition, before progress
It states the ink supply as described in the examples for each spray head 15 and controls treatment process, proposed more to each constant ink delivery pressure is provided
Therefore difficult challenge simply implements the control of the generation to constant ink delivery pressure each in secondary print cartridge 13, this implementation for convenience
In example, the ink in secondary print cartridge 13 is extracted out a part first, so that secondary print cartridge 13 maintains certain initial pressure level.
Therefore, it is detected by pressure when bringing into operation in 131 pairs of first pressure detection device secondary print cartridges 13,
If the pressure detected is unsatisfactory for initial pressure value, trigger controller 17 is controlled back pump 21 and is operated with certain power,
By the ink extraction in secondary print cartridge 13, meet initial pressure in secondary print cartridge 13 until first pressure detection device 131 detects
Power is horizontal, then controller 17 carries out subsequent ink supply control treatment process in turn.
It is worth noting that returning pump 21 in the subsequent normal course of operation of ink feeding system and second time black valve 22 being in
Open state, to guarantee that the ink in secondary print cartridge 13 is flowed back into time in main black bucket 11.
Further, in the ink feeding system further include: the attached getter assembly being connected between ink feed pump 12 and secondary print cartridge 13.Its
In, it include degasification cavity 31, degassing pump 32, third pressure-detecting device 33, photoelectric detection system 34 in the attached getter assembly.
The controller 17 is also used to remove in the pressure satisfaction that third pressure-detecting device 33 detects in degasification cavity 31
When gas negative pressure, control degassing pump 32 is operated, and the bubble in ink in degasification cavity 31 is filtered out.
Photoelectric detection system 34, for detecting whether degasification cavity 31 overflows ink.
In the present embodiment, attached getter assembly is mainly used for filtering out the bubble flowed into the ink in secondary print cartridge 13.
Bubble may be had by flowing into the ink in degasification cavity 31, the presence of the bubble will lead in degasification cavity 31
Negative pressure level change.In order to reach the degassing effect more understood, a certain ideal subnormal ambient may be set in
Under, degassing processing is carried out, the corresponding pressure of this ideal subnormal ambient is above-mentioned degasification negative pressure.
With being continuously increased for black underwater bubble, the pressure-reduction level in degasification cavity 31 is gradually reduced, when third pressure is examined
When survey device 33 detects that pressure-reduction level is matched with degasification negative pressure, trigger controller 17 controls degassing pump 32 and operates, by ink
In bubble extraction filter out.
In addition, in practical application, probably due to certain reasons, can have a possibility that ink spilling, at this point, passing through setting
Photoelectric detection system 34 detects whether degasification cavity 31 overflows ink, if overflowing, alerts in time.
It further, further include filter assemblies in the ink feeding system, filter assemblies are connect with ink feed pump 12, for filtering out ink
Impurity in water.
It specifically, include: first filter 41 and the second filter 42 in the filter assemblies.
Wherein, first filter 41 is connect with the ink entrance of ink feed pump 12, and the second filter 42 is out of ink with ink feed pump 12
Mouth connection.
Wherein, the pore size filter of first filter 41 is greater than the pore size filter of the second filter 42.That is, the first mistake
Filter 41 is for filtering out biggish impurity particle in ink, and the second filter 42 is for filtering out lesser impurity particle in ink.
Why two different filters are set, and a main cause is filled in 12 supply quantity of ink of guarantee ink feed pump
While foot, timely i.e. secondary 13 ink influx abundance of print cartridge, guarantee to enter free from foreign meter in the ink in secondary print cartridge 13.
Through this embodiment, the ink flow rate that inflow can be effectively ensured, flow out secondary print cartridge, guarantees having for ink supply control
Effect carries out, while guaranteeing without containing bubble, impurity in ink, so that print job is gone on smoothly.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic disk or light
The various media that can store program code such as disk.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (4)
1. a kind of ink feeding system characterized by comprising
Main ink bucket, ink feed pump, secondary print cartridge, first time black valve, at least one spray head, ink supply valve corresponding with each spray head and
Controller；
The ink outlet port of the main black bucket is connect with the ink entrance that the ink feed pumps, the ink outlet port of the ink feed pump and the secondary ink
The ink entrance of box connects, and the first ink outlet port of the secondary print cartridge accesses the main black bucket by described first time black valve, described
Each second ink outlet port of secondary print cartridge is correspondingly connected with by ink supply valve corresponding with each spray head with each spray head respectively；
First pressure detection device is installed in the secondary print cartridge, corresponding second pressure detection is installed at each spray head
Device；
The controller stablizes pressure needed for the pressure and each spray head for detecting according to the first pressure detection device
Power pumps the ink feed carry out power control respectively, so as to generate respectively in the secondary print cartridge corresponding with each steady pressure
Constant ink delivery pressure；
The controller is also used to needed for the pressure of any second pressure detection device detection is unsatisfactory for corresponding spray head
It when steady pressure, controls corresponding ink supply valve and opens, meet in the pressure of any second pressure detection device detection and correspond to
When steady pressure needed for spray head, controls corresponding ink supply valve and close；
The ink feeding system, further includes: the attached getter assembly being connected between the ink feed pump and the secondary print cartridge；
It include degasification cavity, degassing pump, third pressure-detecting device in the attached getter assembly；
The controller is also used to detect that the pressure in the degasification cavity meets degasification in the third pressure-detecting device
When negative pressure, the degassing pump operating is controlled, the bubble in ink in the degasification cavity is filtered out；
The attached getter assembly further include:
Photoelectric detection system, for detecting whether the degasification cavity overflows ink.
2. ink feeding system according to claim 1, which is characterized in that further include:
Return pump, second time black valve；
The third ink outlet port of the secondary print cartridge is connect with the ink entrance of described time pump, and the ink outlet port of described time pump passes through institute
State second time black valve access main black bucket；
The controller is also used in the ink feeding system initial launch, if the first pressure detection device received
Detect that the pressure in the secondary print cartridge is unsatisfactory for the instruction of initial pressure, then control is described returns pump with predetermined power for institute
The ink extraction in secondary print cartridge is stated, is flowed into the main black bucket by described second time black valve, so that in the secondary print cartridge
Pressure meet the initial pressure.
3. ink feeding system according to claim 1, which is characterized in that further include: filter assemblies；
The filter assemblies and ink feed pump connect, for filtering out the impurity in ink.
4. ink feeding system according to claim 3, which is characterized in that include: in the filter assemblies
First filter and the second filter；
The first filter is connect with the ink entrance that the ink feed pumps, the ink outlet port of second filter and ink feed pump
Connection；
The pore size filter of the first filter is greater than the pore size filter of second filter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510845022.2A CN106799894B (en) | 2015-11-26 | 2015-11-26 | Ink feeding system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510845022.2A CN106799894B (en) | 2015-11-26 | 2015-11-26 | Ink feeding system |
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| CN106799894A CN106799894A (en) | 2017-06-06 |
| CN106799894B true CN106799894B (en) | 2019-01-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| NL2032995B1 (en) * | 2022-09-09 | 2024-03-21 | De Grood Beheer En Vastgoed B V | Method and device for applying a two-dimensional liquid pattern to a substrate |
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| CN109203708A (en) * | 2017-07-05 | 2019-01-15 | 亿码（厦门）标识科技有限公司 | A kind of cleaning of integral intelligent ink road, emptying, ink-feeding device |
| CN109664618B (en) * | 2017-10-16 | 2020-10-13 | 北大方正集团有限公司 | Ink supply control system, printing machine, and ink supply control method |
| CN110860651A (en) * | 2019-11-22 | 2020-03-06 | 郑州中兴三维科技有限公司 | High accuracy 3D sand mould printing apparatus |
| CN111300987B (en) * | 2020-02-27 | 2021-02-02 | 深圳怡化电脑股份有限公司 | Ink jet interval time determining method, device, computer equipment and storage medium |
| CN111746124A (en) * | 2020-06-10 | 2020-10-09 | 深圳圣德京粤科技有限公司 | Circulating ink supply system |
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| CN106799894A (en) | 2017-06-06 |
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