A circulating steady flow injection type ink supply system

Abstract

The present application relates to inkjet printing technology field, especially to a kind of injection type ink supply system of circulating steady flow, it includes rack, first injection ink supply unit, second injection ink supply unit, reverse linkage mechanism and ink outlet pipeline, and first and second injection ink supply unit both include ink supply bottle, injection push rod and drive module, reverse linkage mechanism is transmission connection between two injection push rods, the ink pushing action of one injection ink supply unit is converted into the ink sucking and liquid supplementing action of another injection ink supply unit, and the mechanical synchronous alternate work of double unit is realized.The ink pushing, ink sucking reverse synchronization of first, second injection ink supply unit is realized by reverse linkage mechanism, one unit ink pushing ink supply, another unit synchronously ink sucking and liquid supplementing, there is no ink supply interruption time, and continuous operation demand can be met.

Description

Technical Field

[0001] This invention relates to the field of inkjet printing technology, and more particularly to a circulating, constant-flow injection-type ink supply system. Background Technology

[0002] In the field of precision spraying and printing, the stability of ink flow directly affects product quality. Existing ink path systems include pneumatic drive systems and traditional injection pump systems. Among them, pneumatic drive systems suffer from slow flow control response due to the compressibility of gas, and are easily affected by fluctuations in the gas source and ambient temperature, making it difficult to achieve rapid and accurate micro-volume control. While traditional injection pump systems offer high injection accuracy due to the incompressibility of liquids, the single-pump structure is limited by the stroke and must switch between injection and suction, resulting in ink supply interruptions and failing to meet the needs of long-term continuous operation. Dual-pump structures are also prone to control asynchrony problems during switching. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to solve at least one of the technical problems mentioned above.

[0004] The solution to the technical problem of this invention is: a circulating, stable-flow injection-type ink supply system, comprising: a frame; a first injection ink supply unit, including a first ink bottle, a first injection push rod, and a first drive module for driving the first injection push rod to reciprocate, the first ink bottle being disposed on the frame, and a first piston being provided at one end of the first injection push rod, the first piston being slidably and sealingly disposed in the inner cavity of the first ink bottle; and a second injection ink supply unit, including a second ink bottle, a second injection push rod, and a second drive module for driving the second injection push rod to reciprocate, the second ink bottle being disposed on the frame, and the second injection... One end of the injection push rod is provided with a second piston, which is slidably sealed in the inner cavity of the second ink supply bottle; a reverse linkage mechanism is provided on the frame, which is drivenly connected between the first injection push rod and the second injection push rod, and is used to convert the ink pushing action of the injection push rod of one injection ink supply unit into the ink absorption and replenishment action of the injection push rod of the other injection ink supply unit; an ink outlet pipeline is provided on the frame, the output end of the first ink supply bottle is connected to the ink outlet pipeline, the output end of the second ink supply bottle is connected to the ink outlet pipeline, and the output end of the ink outlet pipeline is used to supply ink to the printhead.

[0005] As a further improvement to the above technical solution, the first drive module includes a first drive motor and a first transmission wheel. The first drive motor is mounted on the frame, and the first transmission wheel is mounted on the output shaft of the first drive motor. The first transmission wheel is drivenly connected to the first injection push rod and is used to drive the first injection push rod to reciprocate linearly along the axial direction of the first ink supply bottle. The second drive module includes a second drive motor and a second transmission wheel. The second drive motor is mounted on the frame, and the second transmission wheel is mounted on the output shaft of the second drive motor. The second transmission wheel is drivenly connected to the second injection push rod and is used to drive the second injection push rod to reciprocate linearly along the axial direction of the second ink supply bottle.

[0006] As a further improvement to the above technical solution, both the first transmission wheel and the second transmission wheel are drive gears. The first drive module further includes a first rack, which is disposed on the outer wall of the first injection push rod and meshes with the first transmission wheel. The second drive module further includes a second rack, which is disposed on the outer wall of the second injection push rod and meshes with the second transmission wheel.

[0007] As a further improvement to the above technical solution, both the first transmission wheel and the second transmission wheel are driving friction wheels. The outer wall of the first injection push rod is provided with a first friction transmission surface that cooperates with the first transmission wheel, and the outer wall of the second injection push rod is provided with a second friction transmission surface that cooperates with the second transmission wheel.

[0008] As a further improvement to the above technical solution, the reverse linkage mechanism includes a flexible traction member and a guide assembly. The guide assembly is disposed on the frame and located between the first ink supply unit and the second ink supply unit. The flexible traction member is wound around the guide assembly. One end of the flexible traction member is fixedly connected to the first injection push rod, and the other end is fixedly connected to the second injection push rod.

[0009] As a further improvement to the above technical solution, the guiding component includes a first arc-shaped guide rail and a second arc-shaped guide rail, both of which are disposed on the frame. A continuous guiding space is formed between the first arc-shaped guide rail and the second arc-shaped guide rail. The flexible traction member is constrained within the guiding space and extends to complete the conversion of the direction of motion, so as to convert the downward thrust of one injection push rod into the upward pulling force of the other injection push rod.

[0010] As a further improvement to the above technical solution, the guide assembly further includes a first pulley group and a second pulley group. The first pulley group is disposed on the side of the first arc-shaped guide rail facing the second arc-shaped guide rail, and the second pulley group is disposed on the side of the second arc-shaped guide rail facing the first arc-shaped guide rail. Both the first pulley group and the second pulley group are tactilely connected to the flexible traction member.

[0011] As a further improvement to the above technical solution, a valve control group is also included. The valve control group includes: a first ink outlet check valve, a second ink outlet check valve, a first ink inlet check valve, and a second ink inlet check valve. The first ink outlet check valve is located on the output pipeline of the first ink supply bottle, the second ink outlet check valve is located on the output pipeline of the second ink supply bottle, the first ink inlet check valve is located on the input pipeline of the first ink supply bottle, and the second ink inlet check valve is located on the input pipeline of the second ink supply bottle.

[0012] As a further improvement to the above technical solution, a flow sensor and a controller are also included. The flow sensor is disposed at the output end of the ink outlet pipeline, and the controller is electrically connected to the flow sensor, the first drive module and the second drive module respectively.

[0013] As a further improvement to the above technical solution, a flow stabilizing buffer component is also included, which is mounted on the frame. The output end of the flow stabilizing buffer component is connected to the ink outlet pipeline, and is used to maintain the stability of the output flow rate during the ink supply switching process of the two ink injection units.

[0014] As a further improvement to the above technical solution, the current stabilization buffer assembly includes a third ink supply bottle, a third injection push rod, and a third drive module for driving the third injection push rod to reciprocate. The third ink supply bottle is mounted on the frame, and a third piston is provided at one end of the third injection push rod. The third piston is slidably and sealed in the inner cavity of the third ink supply bottle.

[0015] As a further improvement to the above technical solution, it also includes a printhead, a main ink bottle, a secondary ink bottle, and a circulation pump. The output end of the main ink bottle is connected to the input end of the first ink supply bottle and the input end of the second ink supply bottle through a pipeline. The secondary ink bottle is connected to the waste liquid output end of the printhead through a pipeline. The circulation pump is connected between the output end of the secondary ink bottle and the ink return end of the main ink bottle through a pipeline.

[0016] The beneficial effects of this invention are as follows: the frame provides basic support; one end of the injection pusher in the injection ink supply unit is connected to a piston, which is slidably sealed in the inner cavity of the ink supply bottle. The piston is driven by a moving module to reciprocate linearly, realizing ink injection and replenishment. A reverse linkage mechanism is fixedly connected to the first and second injection pushers, converting the linear motion of one injection pusher into the reverse linear motion of the other, ensuring synchronized movement and real-time coordination of ink supply and replenishment. The ink outlet pipeline collects the ink output from the first and second ink supply bottles and stably delivers it to the printhead. The reverse linkage mechanism achieves reverse synchronization of ink injection and replenishment between the first and second injection ink supply units. When one unit is injecting ink, the other unit is simultaneously replenishing ink, eliminating ink supply interruption time and meeting continuous operation requirements. The pusher squeezes the ink in the ink supply bottle, utilizing the incompressibility of liquids, resulting in better flow control accuracy and stability compared to pneumatic drives. The mechanical synchronization of the reverse linkage mechanism eliminates the need for complex electronic control coordination algorithms, reducing the complexity of the control system. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram illustrating the cooperation between the first ink supply unit, the second ink supply unit, and the reverse linkage mechanism in one embodiment of the present invention.

[0019] Figure 3 This is one of the schematic diagrams of a circulating printhead ink supply according to one embodiment of the present invention.

[0020] Figure 4 This is a second schematic diagram of a circulating printhead ink supply according to one embodiment of the present invention.

[0021] Reference numerals in the attached drawings: 100-frame, 200-first ink injection unit, 210-first ink bottle, 220-first injection push rod, 230-first drive module, 231-first drive motor, 232-first transmission wheel, 233-first friction transmission surface, 300-second ink injection unit, 310-second ink bottle, 320-second injection push rod, 330-second drive module, 331-second drive motor, 332-second transmission wheel, 333-second friction transmission surface, 400-reverse linkage mechanism, 410-flexible Traction component, 421-First arc-shaped guide rail, 422-Second arc-shaped guide rail, 423-First pulley block, 424-Second pulley block, 500-Ink outlet pipeline, 600-First ink outlet check valve, 610-Second ink outlet check valve, 620-First ink inlet check valve, 630-Second ink inlet check valve, 700-Flow sensor, 800-Flow stabilizing buffer assembly, 810-Third ink supply bottle, 820-Third injection push rod, 830-Third drive module, 900-Printhead, 910-Main ink bottle, 920-Substitute ink bottle, 930-Circulation pump. Detailed Implementation

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments have been briefly explained above. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0023] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages mentioned herein do not simply refer to direct connection of components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0024] In the field of precision spraying and printing, the stability of ink flow directly affects product quality. Existing ink path systems include pneumatic drive systems and traditional injection pump systems. Among them, pneumatic drive systems suffer from slow flow control response due to the compressibility of gas, and are easily affected by fluctuations in the gas source and ambient temperature, making it difficult to achieve rapid and accurate micro-volume control. While traditional injection pump systems offer high injection accuracy due to the incompressibility of liquids, the single-pump structure is limited by the stroke and must switch between injection and suction, resulting in ink supply interruptions and failing to meet the needs of long-term continuous operation. Dual-pump structures are also prone to control asynchrony problems during switching.

[0025] Therefore, this invention proposes a circulating, constant-flow injection-type ink supply system, referring to... Figures 1-4 It includes: a frame 100; a first ink injection unit 200, including a first ink bottle 210, a first injection push rod 220, and a first drive module 230 for reciprocating motion of the first injection push rod 220, wherein the first ink bottle 210 is disposed on the frame 100, and one end of the first injection push rod 220 is provided with a first piston, the first piston being slidably sealed within the inner cavity of the first ink bottle 210; and a second ink injection unit 300, including a second ink bottle 310, a second injection push rod 320, and a second drive module 330 for reciprocating motion of the second injection push rod 320, wherein the second ink bottle 310 is disposed on the frame 100, and one end of the second injection push rod 3 .... Two pistons, the second piston being slidably sealed within the inner cavity of the second ink supply bottle 310; a reverse linkage mechanism 400, mounted on the frame 100, is tractively connected between the first injection push rod 220 and the second injection push rod 320, used to convert the ink pushing action of the injection push rod of one injection ink supply unit into the ink absorption and replenishment action of the injection push rod of the other injection ink supply unit; an ink outlet pipe 500, mounted on the frame 100, with the output end of the first ink supply bottle 210 connected to the ink outlet pipe 500, and the output end of the second ink supply bottle 310 connected to the ink outlet pipe 500, the output end of the ink outlet pipe 500 being used to supply ink to the printhead 900.

[0026] The frame 100 provides basic support; one end of the injection pusher in the injection ink supply unit is connected to a piston, which is slidably sealed in the inner cavity of the ink supply bottle. The piston, driven by a moving module, reciprocates linearly, realizing ink injection and replenishment. A reverse linkage mechanism 400 is fixedly connected to the first and second injection pushers 320 respectively, converting the linear motion of one injection pusher into the reverse linear motion of the other, ensuring synchronized movement and real-time coordination of ink supply and replenishment. The ink outlet line 500 collects the ink output from the first and second ink supply bottles 310 and stably delivers it to the printhead 900. The reverse linkage mechanism 400 enables the first and second ink injection units 300 to push and suck ink in reverse synchronization. When one unit pushes ink to supply ink, the other unit simultaneously sucks ink to replenish the liquid, eliminating ink supply interruption time and meeting the needs of continuous operation. The push rod squeezes the ink in the ink bottle, utilizing the incompressibility of liquid, which has better flow control accuracy and stability compared to pneumatic drive. The reverse linkage mechanism 400 is mechanically synchronized, eliminating the need for complex electronic control coordination algorithms and reducing the complexity of the control system.

[0027] During continuous ink supply operation, the first drive module 230 is activated, driving the first injection pusher 220 to advance into the first ink supply bottle 210. The ink is squeezed from the output end of the first ink supply bottle 210 into the ink outlet pipe 500 and stably delivered to the printhead 900. At the same time, the first injection pusher 220 drives the second injection pusher 320 to retract to the outside of the second ink supply bottle 310 through the reverse linkage mechanism 400. External ink is drawn into the second ink supply bottle 310, completing the replenishment. When the first injection pusher 220 reaches the end of its stroke, the second injection pusher 320 simultaneously switches to the ink pushing action, and the first injection pusher 220 simultaneously switches to the ink suction action. The above process is repeated to achieve continuous and uninterrupted ink supply.

[0028] In one embodiment, the first drive module 230 includes a first drive motor 231 and a first transmission wheel 232. The first drive motor 231 is mounted on the frame 100, and the first transmission wheel 232 is mounted on the output shaft of the first drive motor 231. The first transmission wheel 232 is tractively connected to the first injection push rod 220 and is used to drive the first injection push rod 220 to reciprocate linearly along the axial direction of the first ink supply bottle 210. The second drive module 330 includes a second drive motor 331 and a second transmission wheel 332. The second drive motor 331 is mounted on the frame 100, and the second transmission wheel 332 is mounted on the output shaft of the second drive motor 331. The second transmission wheel 332 is tractively connected to the second injection push rod 320 and is used to drive the second injection push rod 320 to reciprocate linearly along the axial direction of the second ink supply bottle 310. When the motor is powered on, it rotates, driving the transmission wheel on the output shaft to rotate. The transmission wheel converts the rotational motion into the linear reciprocating motion of the push rod in the ink supply bottle through friction or meshing. The structure is simple and mature, the motor rotation angle can be precisely controlled, the control accuracy is high, and the ink supply speed can be easily adjusted through the electronic control system.

[0029] In high-viscosity ink or high-pressure ink supply scenarios, simple contact transmission may slip, leading to inaccurate ink dispensing. Therefore, in one embodiment, both the first transmission wheel 232 and the second transmission wheel 332 are drive gears. The first drive module 230 also includes a first rack, which is disposed on the outer wall of the first injection push rod 220 and meshes with the first transmission wheel 232. The second drive module 330 also includes a second rack, which is disposed on the outer wall of the second injection push rod 320 and meshes with the second transmission wheel 332. The gear teeth mesh with the rack on the push rod. For every angle the motor rotates, the push rod moves a corresponding linear distance, achieving forced displacement. This gear and rack meshing transmission method achieves zero slippage, ensuring absolute accuracy of the injection volume. It is particularly suitable for OLED inkjet printing processes with extremely high flow accuracy requirements, and also provides a large transmission thrust.

[0030] Gear drives have backlash, which can cause minor vibrations during reversal; and rigid connections lack overload protection. Therefore, in one embodiment, both the first drive wheel 232 and the second drive wheel 332 are driving friction wheels. The outer wall of the first injection push rod 220 is provided with a first friction drive surface 233 that mates with the first drive wheel 232, and the outer wall of the second injection push rod 320 is provided with a second friction drive surface 333 that mates with the second drive wheel 332. This flexible contact transmission using friction wheels, with rubber or polyurethane rollers pressed tightly against the frosted surface of the push rod, utilizes the positive pressure between the wheel and the rod to generate static friction, driving the push rod movement through friction. The transmission is smooth and vibration-free with low noise. When the system experiences unexpected blockage, the friction wheels can slip, providing overload protection and preventing damage to the expensive nozzle 900 or motor.

[0031] If a linkage or lever is used for reverse linkage, the structure is bulky and occupies lateral space. Therefore, in one embodiment, the reverse linkage mechanism 400 includes a flexible traction member 410 and a guide assembly. The guide assembly is disposed on the frame 100 and located between the first ink injection unit 200 and the second ink injection unit 300. The flexible traction member 410 is wound around the guide assembly. One end of the flexible traction member 410 is fixedly connected to the first injection push rod 220, and the other end is fixedly connected to the second injection push rod 320. By using the flexible traction member 410 in conjunction with the guide assembly, specifically, the flexible traction member 410 is a steel wire rope or a synchronous belt. When the first injection push rod 220 moves axially downward, the flexible traction member 410 drives the second injection push rod 320 to move axially upward, or vice versa, to achieve an alternating working mode in which one injection unit pushes ink and the other injection unit simultaneously absorbs ink and replenishes liquid. The structure is extremely compact and can be flexibly arranged. Utilizing the characteristics of the flexible member, the tolerance for parallelism error between the two push rods is high, and it is not easy to jam.

[0032] In one embodiment, the guiding assembly includes a first arc-shaped guide rail 421 and a second arc-shaped guide rail 422, both disposed on the frame 100. A continuous guiding space is formed between the first arc-shaped guide rail 421 and the second arc-shaped guide rail 422. The flexible traction member 410 is constrained within the guiding space and extends to complete a change in its direction of movement, converting the downward thrust of one injection pusher into an upward pulling force on the other injection pusher. A U-shaped reversal path is constructed using the arc-shaped guide rails. The flexible member passes through this U-shaped channel and is forced to change its extension direction, thereby converting downward movement on one side into upward movement on the other. This ensures smooth movement and the realization of reverse logic, prevents the flexible member from falling off, and the U-shaped reversal path also makes the entire ink supply system more compact in spatial layout, reducing the overall size of the equipment and facilitating installation and use in various working environments.

[0033] Direct sliding of the flexible component within the guide rail generates significant sliding friction, leading to energy loss and wear, and affecting control accuracy. Therefore, in one embodiment, the guide assembly further includes a first pulley group 423 and a second pulley group 424. The first pulley group 423 is disposed on the side of the first arc-shaped guide rail 421 facing the second arc-shaped guide rail 422, and the second pulley group 424 is disposed on the side of the second arc-shaped guide rail 422 facing the first arc-shaped guide rail 421. Both the first pulley group 423 and the second pulley group 424 are rollably connected to the flexible traction component 410. By introducing rolling friction elements and placing the first pulley group 423 and the second pulley group 424 at the bend of the guide rail, they roll into contact with the flexible component, converting the sliding friction between the flexible traction component 410 and the guide rail into rolling friction. This reduces motion resistance, improves transmission efficiency, extends service life, and makes push-pull movements smoother.

[0034] When the injection pump reciprocates, backflow of ink to the printhead 900 and ink bottle may occur, affecting the stability of ink supply and print quality. Therefore, in one embodiment, a valve control group is also included. The valve control group includes: a first ink outlet check valve 600, a second ink outlet check valve 610, a first ink inlet check valve 620, and a second ink inlet check valve 630. The first ink outlet check valve 600 is located on the output line of the first ink supply bottle 210, the second ink outlet check valve 610 is located on the output line of the second ink supply bottle 310, the first ink inlet check valve 620 is located on the input line of the first ink supply bottle 210, and the second ink inlet check valve 630 is located on the input line of the second ink supply bottle 310. A one-way control structure is installed in the pipeline between the injection pump, printhead 900, and ink bottle. Utilizing the one-way conduction characteristic of the one-way valve, it ensures that the ink can only flow in a preset direction. When the injection pump pushes ink toward the printhead 900, the first ink outlet one-way valve 600 and the second ink outlet one-way valve 610 open, allowing the ink to flow smoothly to the printhead 900. At the same time, the first ink inlet one-way valve 620 and the second ink inlet one-way valve 630 close to prevent ink from flowing back into the ink bottle. When the injection pump draws back ink, the situation is reversed: the ink inlet one-way valve opens and the ink outlet one-way valve closes, achieving a stable and cyclical flow of ink. This prevents ink backflow from contaminating the main ink bottle 910 and prevents air from being drawn back into the printhead 900, forming the foundation of the liquid circuit for continuous ink supply.

[0035] Relying solely on preset parameters of the drive module, such as motor speed and push rod speed, to control flow rate may lead to flow drift due to factors such as changes in ink viscosity and fluctuations in pipeline resistance. Therefore, in one embodiment, a flow sensor 700 and a controller are also included. The flow sensor 700 is located at the output end of the ink outlet pipeline 500, and the controller is electrically connected to the flow sensor 700, the first drive module 230, and the second drive module 330, respectively. The controller is configured to adjust the output speed of the drive module based on the real-time flow rate signal fed back by the flow sensor 700, which can instantly compensate for flow fluctuations caused by changes in ink viscosity, fluctuations in pipeline resistance, and switching between dual pumps, thus solving product defects caused by the lag in response of traditional systems.

[0036] During the instantaneous switching between the two pumps, as one stops and the other starts, a brief pressure drop or flow rate fluctuation occurs in the main pipeline. Therefore, in one embodiment, a flow stabilizing buffer assembly 800 is included, mounted on the frame 100. The output end of the flow stabilizing buffer assembly 800 is connected to the ink outlet pipeline 500, used to maintain a stable output flow rate during the ink supply switching process between the two injection ink supply units. Adding the flow stabilizing buffer assembly 800 to the ink outlet pipeline 500 acts as a compensator, releasing or absorbing fluid during pressure fluctuations to ensure that the flow rate at the printhead 900 end remains a smooth straight line during the switching interval, guaranteeing consistent print quality.

[0037] If a passive buffer, such as an airbag, is used, the response is slow and the accuracy is low, making it difficult to achieve high-precision pulse elimination. Therefore, in one embodiment, the flow stabilization buffer assembly 800 includes a third ink supply bottle 810, a third injection pusher 820, and a third drive module 830 that drives the third injection pusher 820 to reciprocate. The third ink supply bottle 810 is mounted on the frame 100, and one end of the third injection pusher 820 is provided with a third piston, which is slidably sealed within the inner cavity of the third ink supply bottle 810. The structure of the third drive module 830 is the same as that of the first drive module 230, and it is used to drive the third injection pusher 820 to reciprocate linearly along the axial direction. In this embodiment, the third injection unit does not participate in the regular ink supply; it only serves as a dynamic flow compensation device and is triggered and activated when the two main injection units switch ink supply states. Specifically, when the flow sensor 700 detects that the real-time flow rate in the ink outlet pipe 500 drops below a preset threshold, or the rate of change of flow rate exceeds a set range, the controller determines that it is currently in an ink supply transition period and immediately sends a compensation command to the third drive module 830. The third drive module 830 responds to the command by controlling the third injection pusher 820 to push the piston and inject a small amount of ink into the ink outlet pipe 500 to compensate for the instantaneous flow gap. After completing the compensation action, the third injection pusher 820 retracts in the reverse direction, creating negative pressure to draw in a small amount of excess ink from the ink outlet pipe 500, achieving self-calibration reset and preventing accumulated errors. Furthermore, the controller establishes a predictive model based on historical flow data, which can start the third injection unit in advance before the main injection unit completes its push stroke, achieving forward-looking compensation and further improving the flow stabilization effect. Through the above closed-loop control strategy, this system can maintain a small fluctuation in ink flow rate during the alternating operation of the two injection units, which is superior to traditional intermittent ink supply systems.

[0038] A single ink bottle design may experience ink supply interruptions due to ink depletion, requiring machine shutdown for refilling and impacting continuous operation efficiency. Therefore, in one embodiment, the system further includes a printhead, a main ink bottle, a secondary ink bottle, and a circulation pump. The output of the main ink bottle is connected via piping to the input of the first ink supply bottle 210 and the input of the second ink supply bottle 310. The secondary ink bottle is connected via piping to the waste liquid output of the printhead. The circulation pump is connected via piping between the output of the secondary ink bottle and the return ink end of the main ink bottle. By collecting printhead waste liquid in the secondary ink bottle and driving it back to the main ink bottle via the circulation pump, ink recovery rate is improved, waste rate is reduced, and consumable costs are lowered. Simultaneously, it avoids waste liquid discharge that pollutes the environment, meeting environmental protection requirements. The main ink bottle has a large capacity, and with the secondary ink bottle's circulation replenishment, it prevents machine shutdowns due to ink depletion, ensuring continuous operation time is not limited by ink capacity. The circulation pump drives continuous ink flow and renewal, ensuring ink uniformity.

[0039] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A recirculating, steady flow, injection type ink supply system characterized by, The application relates to a printing ink injection device. The device comprises a rack, a first ink injection unit, a second ink injection unit, a reverse linkage mechanism, an ink outlet pipeline and a first driving module. The first ink injection unit comprises a first ink supply bottle, a first injection push rod and a first driving module for driving the first injection push rod to reciprocate, the first ink supply bottle is arranged on the rack, one end of the first injection push rod is provided with a first piston which is arranged in a sliding sealing mode in the inner cavity of the first ink supply bottle. The second ink injection unit comprises a second ink supply bottle, a second injection push rod and a second driving module for driving the second injection push rod to reciprocate, the second ink supply bottle is arranged on the rack, one end of the second injection push rod is provided with a second piston which is arranged in a sliding sealing mode in the inner cavity of the second ink supply bottle. The reverse linkage mechanism is arranged on the rack, is transmissionally connected between the first injection push rod and the second injection push rod, and is used for converting the ink pushing action of the injection push rod of one of the ink injection units into the ink sucking and liquid supplementing action of the injection push rod of the other ink injection unit. The ink outlet pipeline is arranged on the rack, the output end of the first ink supply bottle is in communication with the ink outlet pipeline, the output end of the second ink supply bottle is in communication with the ink outlet pipeline, and the output end of the ink outlet pipeline is used for supplying ink to a nozzle. The reverse linkage mechanism comprises a flexible traction member and a guide assembly, the guide assembly is arranged on the rack and located between the first ink injection unit and the second ink injection unit, the flexible traction member is arranged around the guide assembly, one end of the flexible traction member is fixedly connected to the first injection push rod, and the other end of the flexible traction member is fixedly connected to the second injection push rod. The guide assembly comprises a first arc-shaped guide rail and a second arc-shaped guide rail which are both arranged on the rack, a continuous guide space is formed between the first arc-shaped guide rail and the second arc-shaped guide rail, the flexible traction member is constrained to extend in the guide space and complete the motion direction conversion so as to convert the downward pushing force of one of the injection push rods into the upward pulling force of the other injection push rod. The guide assembly further comprises a first pulley set and a second pulley set, the first pulley set is arranged on one side of the first arc-shaped guide rail which faces the second arc-shaped guide rail, the second pulley set is arranged on one side of the second arc-shaped guide rail which faces the first arc-shaped guide rail, and the first pulley set and the second pulley set are both in rolling connection with the flexible traction member.

2. The recirculating current regulated injection type ink supply system according to claim 1, wherein The first driving module comprises a first driving motor and a first transmission wheel, the first driving motor is arranged on the rack, the first transmission wheel is arranged on the output shaft of the first driving motor, the first transmission wheel is in transmission connection with the first injection push rod and is used for driving the first injection push rod to perform reciprocating linear motion along the axial direction of the first ink supply bottle. The second driving module comprises a second driving motor and a second transmission wheel, the second driving motor is arranged on the rack, the second transmission wheel is arranged on the output shaft of the second driving motor, the second transmission wheel is in transmission connection with the second injection push rod and is used for driving the second injection push rod to perform reciprocating linear motion along the axial direction of the second ink supply bottle.

3. The recirculating dcficient fluid- stable injection ink system of claim 2, wherein, The first transmission wheel and the second transmission wheel are driving gears, the first drive module further comprises a first rack, the first rack is arranged on the outer wall of the first injection push rod, and the first rack is engaged with the first transmission wheel.

4. The recirculating dcficient fluid injection ink supply system of claim 2 wherein, The first transmission wheel and the second transmission wheel are driving friction wheels, the outer wall of the first injection push rod is provided with a first friction transmission surface matched with the first transmission wheel, and the outer wall of the second injection push rod is provided with a second friction transmission surface matched with the second transmission wheel.

5. The recirculating current regulated inkjet inking system of claim 1, wherein, The valve control group comprises a first ink outlet check valve, a second ink outlet check valve, a first ink inlet check valve and a second ink inlet check valve, the first ink outlet check valve is arranged on the output pipeline of the first ink supply bottle, the second ink outlet check valve is arranged on the output pipeline of the second ink supply bottle, the first ink inlet check valve is arranged on the input pipeline of the first ink supply bottle, and the second ink inlet check valve is arranged on the input pipeline of the second ink supply bottle.

6. The recirculating current regulated inkjet inking system of claim 1, wherein, The flow sensor is arranged on the output end of the ink outlet pipeline, and the controller is electrically connected with the flow sensor, the first drive module and the second drive module respectively.

7. The recirculating current regulated inkjet inking system of claim 6, wherein, The flow stabilizing and buffering assembly is arranged on the rack, and the output end of the flow stabilizing and buffering assembly is communicated with the ink outlet pipeline, so that the stability of the output flow rate is maintained during the ink supply switching process of the two injection ink supply units.

8. The recirculating current regulated, injection molded ink supply system of claim 7, wherein, The flow stabilizing and buffering assembly comprises a third ink supply bottle, a third injection push rod and a third drive module for driving the third injection push rod to reciprocate, the third ink supply bottle is arranged on the rack, one end of the third injection push rod is provided with a third piston, and the third piston is slidingly and sealingly arranged in the inner cavity of the third ink supply bottle.

9. The recirculating current regulated inkjet inking system of claim 1, wherein, The flow stabilizing and buffering assembly comprises a third ink supply bottle, a third injection push rod and a third drive module for driving the third injection push rod to reciprocate, the third ink supply bottle is arranged on the rack, one end of the third injection push rod is provided with a third piston, and the third piston is slidingly and sealingly arranged in the inner cavity of the third ink supply bottle. The ink head, the main ink bottle, the auxiliary ink bottle and the circulating pump are further included, the output end of the main ink bottle is communicated with the input end of the first ink supply bottle and the input end of the second ink supply bottle through a pipeline, the auxiliary ink bottle is communicated with the waste liquid output end of the ink head through a pipeline, and the circulating pump is communicated between the output end of the auxiliary ink bottle and the ink return end of the main ink bottle through a pipeline.

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