Ink injection mechanism

Abstract

The utility model relates to the field of light industrial mechanical equipment, in particular to an ink injection mechanism. The utility model aims to solve the problem of non-uniform ink injection quantity. The ink injection device comprises an ink temporary storage unit, a linear transmission unit, a servo motor and a base, the ink temporary storage unit comprises a one-way valve and a pump device which are connected front and back; the one-way valve piece comprises a valve cavity, an ink inlet assembly, an ink outlet assembly and a transfer port, the valve cavity is arranged in the one-way valve piece, the pump device comprises an ink storage cylinder and a cylinder piston piece, the ink storage cylinder is arranged on the base, an ink storage cavity is formed in the ink storage cylinder, and the front end and the rear end of the ink storage cylinder are provided with an ink passing port and a piston piece adapting port respectively; the ink storage cavity is connected with the transfer opening through the ink passing opening, and the cylinder body piston piece extends into the ink storage cavity through the piston piece adapting opening. The rear portion of the cylinder piston piece is connected with the linear transmission unit, and the servo motor drives the linear transmission unit to drive the cylinder piston piece to reciprocate back and forth relative to the ink storage cavity.

Description

TECHNICAL FIELD

[0001] The utility model relates to light industry machinery equipment field more particularly, relate to a ink injection mechanism. BACKGROUND

[0002] The production and processing of pen materials such as oil-based pens and ball pens need to go through the ink injection process. For the ink injection process, the ordinary ink injection mechanism is complex to operate, has no uniform standard, and is affected by various production factors, making it difficult to control the ink injection speed. As a result, it is easy to cause large deviations in the ink amount of the final product, and the product quality is difficult to control. In addition, the operator needs to frequently adjust the ink injection mechanism, which increases the labor intensity of the workers and reduces the production efficiency.

[0003] Therefore, it is necessary to improve the existing ink injection mechanism to overcome the above problems. SUMMARY

[0004] The utility model aims at overcoming at least one defect of the prior art, and provides an ink injection mechanism to solve the problem of uneven ink injection.

[0005] The utility model takes the technical scheme that provide an ink injection mechanism, including ink temporary storage unit, linear transmission unit, servo motor and base, ink temporary storage unit linear transmission unit servo motor is from front to back in proper order and is established on base;

[0006] The ink temporary storage unit includes a one-way valve and a pump device connected front and back;

[0007] The one-way valve includes a valve chamber, an ink inlet assembly, an ink outlet assembly, and a transfer port. The valve chamber is located inside the one-way valve. The ink inlet assembly, the ink outlet assembly, and the transfer port are all in communication with the valve chamber. The pump device includes an ink storage cylinder and a cylinder piston. The ink storage cylinder is located on the base. An ink storage chamber is provided inside the ink storage cylinder. A through ink port and a piston fitting port are provided at the front and back ends of the ink storage cylinder, respectively. Both the through ink port and the piston fitting port are in communication with the ink storage chamber. The ink storage chamber is connected to the transfer port through the through ink port. The front part of the cylinder piston extends into the ink storage chamber through the piston fitting port.

[0008] The rear part of the cylinder piston is connected to the front part of the linear transmission unit. The servo motor drives the linear transmission unit to drive the cylinder piston to reciprocate relative to the ink storage chamber.

[0009] In this solution, the servo motor can drive the linear transmission unit to perform precise back-and-forth reciprocating motion relative to the base. The linear transmission unit drives the cylinder piston to perform pushing or pulling actions in the ink storage cylinder, so that the ink enters the valve chamber through the ink inlet component and is temporarily stored in the ink storage cylinder through the transfer port. Then, it is output from the ink storage cylinder through the transfer port, valve chamber, and ink outlet component to the target product. The overall structure of the ink filling mechanism is compact, and the precise drive control based on the servo motor can ensure that the amount of ink absorbed and filled each time is uniform.

[0010] In some embodiments, the linear transmission unit includes a ball screw and a slide rail. The slide rail is disposed on the base and has a predetermined length in the front-rear direction of the base. The ball screw includes a screw and a ball bearing for bearing support of the screw. The rear end of the screw is connected to the drive end of the servo motor, and the front end of the screw extends forward beyond the front end face of the ball bearing. The ball bearing is slidably disposed on the slide rail, and the front part of the ball bearing is connected to the rear part of the cylinder piston.

[0011] In this solution, a servo motor drives a screw to rotate, which in turn drives a ball bearing to perform precise back-and-forth linear motion relative to the slide rail. The ball bearing drives the piston in the ink storage cylinder to perform a push-pull action, thereby enabling the ink storage unit to complete a precise ink absorption and filling process.

[0012] In some embodiments, a connecting member is further provided between the ball bearing and the cylinder piston, with the rear end of the connecting member connected to the ball bearing and the front end of the connecting member connected to the rear part of the cylinder piston.

[0013] This solution facilitates the installation and removal of the cylinder piston or ball bearings through the connecting parts. Since the screw needs to extend forward relative to the front end of the ball bearing, the connecting parts can provide a rearward extension length for the cylinder piston. It is necessary to avoid the cylinder piston from contacting the screw during the reciprocating motion of the cylinder.

[0014] In some embodiments, the connector has a rearward-facing sleeve cavity, and the sleeve cavity is fitted with the screw extending from the front end face of the ball bearing when the connector is connected to the ball bearing, and a gap is left between the inner wall of the sleeve cavity and the screw.

[0015] The connector in this design facilitates the center-of-gravity connection between the cylinder piston and the ball bearing, improving the reliability and stability of the transmission process, thereby achieving precise control of the ink injection volume. Furthermore, the sleeve cavity provides protection for the screw.

[0016] In some embodiments, a first proximity switch is also included on the base, the position of which corresponds to a preset forward position of the ball bearing; and / or,

[0017] It also includes a second proximity switch disposed on the base, the position of which corresponds to a preset rearward position of the ball bearing.

[0018] This solution can automatically control the extreme positions of the ball bearing's forward and backward movement on the slide rail, thereby achieving precise control over the amount of ink injected each time and preventing excessive forward and backward displacement of the ball bearing from colliding with the base, thus extending the service life of the mechanism.

[0019] In some embodiments, a bearing connector is provided between the servo motor and the screw, and the screw is connected to the drive end of the servo motor through the bearing connector.

[0020] The bearing connector in this solution improves the connection stability between the screw and the drive end of the servo motor, reduces system deviation during the operation of the ball screw, and thus improves the uniformity of ink injection in each injection.

[0021] In some embodiments, the one-way valve is further provided with an ink inlet assembly cavity for installing the ink inlet assembly, the inner end face of the ink inlet assembly cavity is provided with an ink inlet port communicating with the valve chamber, and the outer end face of the ink inlet assembly cavity is provided with an ink inlet opening.

[0022] The ink inlet assembly includes an ink inlet connector, an ink inlet piston, and an ink inlet spring. The ink inlet connector is located at the ink inlet opening, and its inner end face is spaced apart from the inner end face of the ink inlet assembly cavity. The ink inlet connector has an ink inlet channel communicating with the ink inlet. The ink inlet piston is inserted into the inner end opening of the ink inlet channel, and its inner end is spaced apart from the inner end face of the ink inlet assembly cavity. The two ends of the ink inlet spring abut against the inner end face of the ink inlet assembly cavity and the ink inlet piston, respectively.

[0023] In some embodiments, the one-way valve further includes an ink outlet assembly cavity for mounting the ink outlet assembly, the inner end face of the ink outlet assembly cavity is provided with an ink outlet communicating with the valve chamber, and the outer end face of the ink outlet assembly cavity is provided with an ink outlet opening.

[0024] The ink dispensing assembly includes an ink dispensing connector, an ink dispensing piston, and an ink dispensing spring. The ink dispensing connector is located at the ink dispensing opening, and its inner end face is spaced apart from the inner end face of the ink dispensing assembly cavity. The ink dispensing connector has an ink dispensing channel communicating with the ink dispensing port in its middle part. The ink dispensing piston is inserted into the ink dispensing port, and its outer end is spaced apart from the inner end face of the ink dispensing connector. The two ends of the ink dispensing spring abut against the inner end face of the ink dispensing connector and the ink dispensing piston, respectively.

[0025] In some embodiments, the ink inlet assembly and the ink outlet assembly are arranged vertically, and the transfer port is located between the ink inlet assembly and the ink outlet assembly.

[0026] This solution can reduce the length of ink tubing inside the ink storage unit and simplify the tubing layout.

[0027] In some embodiments, the inner diameter of the ink storage chamber is larger than the inner diameter of the transfer port.

[0028] This solution can improve the hydraulic pressure when ink is output from the transfer port, reduce ink sticking to the walls of the ink storage cylinder or valve chamber, and improve ink delivery efficiency.

[0029] In some embodiments, a first seal is provided at the front of the cylinder piston, the first seal being used to seal the gap between the cylinder piston and the ink storage chamber.

[0030] In some embodiments, a second sealing element is further provided between the piston fitting port and the cylinder piston.

[0031] Compared with existing technologies, the beneficial effects of this utility model are as follows: By using a servo motor and linear transmission unit to precisely control the reciprocating drive of the cylinder piston, and by employing a one-way valve to restrict the unidirectional flow of ink, precise ink absorption and filling processes can be achieved, improving the uniformity of ink filling. The ink inlet assembly is composed of an ink inlet connector, an ink inlet piston, and an ink inlet spring, and the ink outlet assembly is composed of an ink outlet connector, an ink outlet piston, and an ink outlet spring. This simplifies the one-way valve structure and improves the reliability of the one-way valve in unidirectional ink delivery, thereby enhancing the consistency of each ink filling. Attached Figure Description

[0032] Figure 1 The structure of this utility model Figure 1 .

[0033] Figure 2 The structure of this utility model Figure 2

[0034] Figure 3 A cross-section of a partial structure of this utility model Figure 1 .

[0035] Figure 4 A cross-section of a partial structure of this utility model Figure 2 .

[0036] Figure 5 This is a partial structural diagram of the present invention.

[0037] Reference numerals: Ink storage unit 10, one-way valve 100, valve chamber 110, ink inlet assembly 120, ink inlet connector 121, ink inlet piston 122, ink inlet spring 123, ink inlet connecting pipe 124, ink outlet assembly 130, ink outlet connector 131, ink outlet piston 132, ink outlet spring 133, ink outlet connecting pipe 134, transfer port 140, ink inlet assembly cavity 150, ink inlet 151, ink inlet opening 152, ink outlet assembly cavity 160, ink outlet 161, ink outlet opening 162, silicone sealing ring 170, valve gasket 180, recess 190, pump assembly Components include: 200, ink storage cylinder 210, ink storage chamber 211, ink inlet 212, piston fitting port 213, protrusion 214, cylinder piston 220, first seal 230, second seal 240, linear transmission unit 300, ball screw 310, screw 311, ball bearing 312, slide rail 320, track 321, slider 322, servo motor 400, base 500, first bracket 510, second bracket 520, connector 600, socket cavity 610, first proximity switch 700, second proximity switch 800, and bearing connector 900. Detailed Implementation

[0038] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0039] Example 1

[0040] like Figures 1-4 As shown, this embodiment provides an ink injection mechanism, including an ink storage unit 10, a linear transmission unit 300, a servo motor 400 and a base 500. The ink storage unit 10, the linear transmission unit 300 and the servo motor 400 are arranged sequentially on the base 500 from front to back.

[0041] The ink storage unit 10 includes a one-way valve 100 and a pump device 200 connected at the front and rear.

[0042] The one-way valve 100 includes a valve chamber 110, an ink inlet assembly 120, an ink outlet assembly 130, and a transfer port 140. The valve chamber 110 is located inside the one-way valve 100. The ink inlet assembly 120, the ink outlet assembly 130, and the transfer port 140 are all connected to the valve chamber 110. The pump device 200 includes an ink storage cylinder 210 and a cylinder piston 220. The ink storage cylinder 210 is located on the base 500. The ink storage cylinder 210 has an ink storage chamber 211 inside. The front and rear ends of the ink storage cylinder 210 are respectively provided with an ink inlet 212 and a piston adapter port 213. The ink inlet 212 and the piston adapter port 213 are both connected to the ink storage chamber 211. The ink storage chamber 211 is connected to the transfer port 140 through the ink inlet 212. The front part of the cylinder piston 220 extends into the ink storage chamber 211 through the piston adapter port 213.

[0043] The rear of the cylinder piston 220 is connected to the front of the linear transmission unit 300. The servo motor 400 drives the linear transmission unit 300 to drive the cylinder piston 220 to reciprocate back and forth relative to the ink storage chamber 211. In order to facilitate the completion of mechanical actions, the ink storage unit 10, the linear transmission unit 300, and the servo motor 400 are all required to have a certain mounting height relative to the base 500. In specific implementation, the ink storage unit 10 is mounted on the base 500 through the first bracket 510, and the servo motor 400 is mounted on the base 500 through the second bracket 520.

[0044] During operation, the servo motor 400 drives the linear transmission unit 300 to perform precise back-and-forth reciprocating motion relative to the base 500. The linear transmission unit 300 drives the cylinder piston 220 to perform pushing or pulling actions within the ink storage cylinder 210. When the cylinder piston 220 is pulled back, ink enters the valve chamber 110 from the ink inlet assembly 120 and is temporarily stored in the ink storage cylinder 210 through the transfer port 140. When the cylinder piston 220 is pushed forward, ink is output from the ink storage cylinder 210 sequentially through the transfer port 140, the valve chamber 110, and the ink outlet assembly 130 to the target product, thus completing one ink filling process. The overall structure of this ink filling mechanism is compact, and the servo motor 400 can improve the consistency of each reciprocating motion, thereby improving the uniformity of the ink filling amount each time.

[0045] like Figures 1-3As shown, the linear transmission unit 300 includes a ball screw 310 and a slide rail 320. The slide rail 320 is located on the base 500 and has a preset length in the front-rear direction of the base 500. The ball screw 310 includes a screw 311 and a ball bearing 312 for bearing support of the screw 311. The rear end of the screw 311 is connected to the drive end of the servo motor 400, and the front end of the screw 311 extends forward beyond the front end face of the ball bearing 312. The ball bearing 312 is slidably mounted on the slide rail 320, and the front part of the ball bearing 312 is connected to the rear part of the cylinder piston 220. In a specific implementation, for ease of installation and removal, the slide rail 320 includes a track 321 mounted on the base 500 and a slider 322 slidably mounted on the track 321. The ball bearing 312 is fixedly connected to the upper surface of the slider 322, thereby enabling linear movement of the slider 322 relative to the track 321 in the front-rear direction.

[0046] In actual operation, the servo motor 400 drives the screw 311 to rotate. The rotation of the screw 311 drives the ball bearing 312 to perform a precise back-and-forth linear movement relative to the slide rail 320. In turn, the ball bearing 312 drives the cylinder piston 220 to push forward or pull backward inside the ink storage cylinder 210, so that the ink temporary storage unit 10 completes the precise ink absorption and ink filling process.

[0047] like Figures 1-3 As shown, a connecting member 600 is also provided between the ball bearing 312 and the cylinder piston 220. The rear end of the connecting member 600 is connected to the ball bearing 312, and the front end of the connecting member 600 is connected to the rear part of the cylinder piston 220. For specific implementation, refer to... Figure 3 The connector 600 is provided with a rearward-facing sleeve cavity 610. When the connector 600 is connected to the ball bearing 312, a screw 311 extending from the front end face of the ball bearing 312 is sleeved in the sleeve cavity 610. A gap is left between the inner wall of the sleeve cavity 610 and the screw 311.

[0048] It is understandable that the connector 600 facilitates the installation and removal of the cylinder piston 220 or the ball bearing 312. Since the screw 311 needs to extend forward relative to the front end face of the ball bearing 312, the connector 600 provides a rearward extension length for the cylinder piston 220. It is necessary to avoid the cylinder piston 220 from contacting the screw 311 during its reciprocating motion. In addition, the screw 311 and the ball bearing 312 are usually connected by gravity. The sleeve cavity 610 is interference-fitted around the screw 311, allowing the cylinder piston 220 and the ball bearing 312 to be connected by gravity, improving the reliability and stability of the transmission process, thereby achieving precise control of the ink injection volume. Furthermore, the cavity provides protection for the screw 311.

[0049] like Figure 1 , 2As shown, it also includes a first proximity switch 700 and a second proximity switch 800 disposed on the base 500. The position of the first proximity switch 700 corresponds to the preset forward position of the ball bearing 312, and the position of the second proximity switch 800 corresponds to the preset backward position of the ball bearing 312.

[0050] In practice, the first proximity switch 700 corresponds to the extreme position of the ball bearing 312 moving forward, and the second proximity switch 800 corresponds to the extreme position of the ball bearing 312 moving backward. This automatically controls the movement distance of the ball bearing 312 in the slide rail 320, achieving precise control over the amount of ink injected each time. At the same time, it also prevents the ball bearing 312 from colliding with the base 500 due to excessive forward and backward displacement, thus extending the service life of the mechanism.

[0051] like Figures 1-3 As shown, in order to improve the stability during the driving process, a bearing connector 900 is provided between the servo motor 400 and the screw 311. The drive end of the screw 311 and the servo motor 400 are connected through the bearing connector 900. In this way, the system deviation during the operation of the ball screw 310 can be reduced, thereby improving the uniformity of ink injection in each injection.

[0052] like Figure 4 As shown, the one-way valve 100 is also provided with an ink inlet assembly cavity 150 for installing the ink inlet assembly 120. The inner end face of the ink inlet assembly cavity 150 is provided with an ink inlet port 151 communicating with the valve chamber 110, and the outer end face of the ink inlet assembly cavity 150 is provided with an ink inlet opening 152.

[0053] The ink inlet assembly 120 includes an ink inlet connector 121, an ink inlet piston 122, and an ink inlet spring 123. The ink inlet connector 121 is located at the ink inlet opening 152, and the inner end face of the ink inlet connector 121 is spaced apart from the inner end face of the ink inlet assembly cavity 150. The middle part of the ink inlet connector 121 is provided with an ink inlet channel communicating with the ink inlet 151. The ink inlet piston 122 is inserted into the inner end opening of the ink inlet channel, and the inner end of the ink inlet piston 122 is spaced apart from the inner end face of the ink inlet assembly cavity 150. The two ends of the ink inlet spring 123 abut against the inner end face of the ink inlet assembly cavity 150 and the ink inlet piston 122, respectively.

[0054] In addition, the one-way valve 100 is provided with an ink outlet assembly cavity 160 for installing the ink outlet assembly 130. The inner end face of the ink outlet assembly cavity 160 is provided with an ink outlet 161 communicating with the valve chamber 110, and the outer end face of the ink outlet assembly cavity 160 is provided with an ink outlet opening 162.

[0055] The ink dispensing assembly 130 includes an ink dispensing connector 131, an ink dispensing piston 132, and an ink dispensing spring 133. The ink dispensing connector 131 is located at the ink dispensing opening 162, and the inner end face of the ink dispensing connector 131 is spaced apart from the inner end face of the ink dispensing assembly cavity 160. The middle part of the ink dispensing connector 131 has an ink dispensing channel communicating with the ink dispensing port 161. The ink dispensing piston 132 is inserted into the ink dispensing port 161, and the outer end of the ink dispensing piston 132 is spaced apart from the inner end face of the ink dispensing connector 131. The two ends of the ink dispensing spring 133 abut against the inner end face of the ink dispensing connector 131 and the ink dispensing piston 132, respectively.

[0056] To improve sealing, silicone sealing rings 170 are provided between the ink inlet piston 122 and the ink inlet channel, and between the ink outlet piston 132 and the ink outlet channel; valve gaskets 180 are also provided between the ink inlet connector 121 and the ink inlet opening 152, and between the ink outlet connector 131 and the ink outlet opening 162. Furthermore, to facilitate connection to external pipelines, the ink inlet connector 121 includes an ink inlet pipe 124, and the ink outlet connector 131 includes an ink outlet pipe 134.

[0057] When the cylinder piston 220 is pulled back, a negative pressure is generated in the valve chamber 110. The ink inlet piston 122 moves toward the valve chamber 110, squeezing the ink inlet spring 123. This opens the connection between the ink inlet piston 122 and the inner opening of the ink inlet channel. At the same time, the ink outlet piston 132 further presses against the ink outlet 161, sealing the connection between the ink outlet piston 132 and the ink outlet 161. Thus, the ink inlet channel connects to the valve chamber 110, and external ink enters the valve chamber 110 sequentially through the ink inlet connector 124 and the ink inlet channel, and is then fed into the valve chamber 110 through the transfer port 140. Inside the ink storage cylinder 210; then, the servo motor 400 drives the ball screw 310 to push the cylinder piston 220 forward. The ink inlet piston 122 tends to move outward under air pressure, thereby pressing the inner end opening of the ink inlet channel. At the same time, the ink outlet piston 132 moves outward to squeeze the ink inlet piston 122, so that the ink outlet piston 132 and the ink outlet 161 are in an open state. Thus, ink is injected from the ink outlet cylinder through the transfer port 140, valve chamber 110, ink outlet 161, ink outlet channel and ink outlet connector 134 into the target product.

[0058] like Figure 4 As shown, in order to simplify the ink delivery pipeline, the ink inlet assembly 120 and the ink outlet assembly 130 are arranged vertically, and the transfer port 140 is located between the ink inlet assembly 120 and the ink outlet assembly 130.

[0059] like Figure 4As shown, the inner diameter of the ink storage chamber 211 is larger than the inner diameter of the transfer port 140. This increases the hydraulic pressure when ink is output from the transfer port 140, reduces ink adhesion to the walls of the ink storage cylinder 210 or valve chamber 110, and improves ink delivery efficiency. Specifically, the front end of the ink storage cylinder 210 has a protrusion 214, and the transfer port 140 of the one-way valve 100 is configured with a recess 190 that matches the protrusion 214. The one-way valve 100 is fixedly connected to the recess 190 of the ink storage cylinder 210 via the recess. Specifically, the protrusion 214 and the recess 190 are connected by threads.

[0060] like Figure 5 As shown, a first seal 230 is provided at the front of the cylinder piston 220. The first seal 230 is used to seal the gap between the cylinder piston 220 and the ink storage chamber 211. A second seal 240 is also provided between the piston adapter port 213 and the cylinder piston 220. In a specific implementation, the first seal 230 is a rubber ring surrounding the front of the cylinder piston 220, and the second seal 240 is a sealing sponge ring located at the rear of the ink storage cylinder 210.

[0061] The specific working method of this utility model is as follows: The servo motor 400 drives the screw 311 to rotate in the opposite direction. The screw 311 drives the ball bearing 312 and the slider 322 to move linearly backward on the track 321. As a result, the cylinder piston 220 pulls backward in the ink storage cylinder 210. At this time, a negative pressure is generated in the valve chamber 110. The ink inlet piston 122 moves toward the valve chamber 110 and squeezes the ink inlet spring 123. The ink inlet piston 122 is in an open state with the inner end opening of the ink inlet channel. At the same time, the ink outlet piston 132 further presses the ink outlet 161 under the action of negative pressure. The ink outlet piston 132 is in a blocked state with the ink outlet 161. Thus, the ink inlet channel is connected to the valve chamber 110. The external ink enters the valve through the ink inlet connector 124 and the ink inlet channel in sequence. The ink is fed into the ink storage cylinder 210 through the transfer port 140. Then, the servo motor 400 drives the screw 311 to rotate forward. The screw 311 drives the ball bearing 312 and the slider 322 to move forward linearly on the track 321. As a result, the cylinder piston 220 moves forward in the ink storage cylinder 210. The ink inlet piston 122 tends to move outward under the action of air pressure. As a result, the ink inlet piston 122 presses the inner end opening of the ink inlet channel. At the same time, the ink outlet piston 132 moves outward to squeeze the ink inlet piston 122, so that the ink outlet piston 132 and the ink outlet 161 are in an open state. Thus, the ink is injected from the ink outlet cylinder through the transfer port 140, the valve chamber 110, the ink outlet 161, the ink outlet channel and the ink outlet connector 134 into the target product.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An ink-filling mechanism, characterized in that, It includes an ink storage unit, a linear drive unit, a servo motor, and a base, wherein the ink storage unit, the linear drive unit, and the servo motor are arranged sequentially on the base from front to back; The ink storage unit includes a one-way valve and a pump device connected at the front and rear. The one-way valve includes a valve chamber, an ink inlet assembly, an ink outlet assembly, and a transfer port. The valve chamber is located inside the one-way valve. The ink inlet assembly, the ink outlet assembly, and the transfer port are all connected to the valve chamber. The pump device includes an ink storage cylinder and a cylinder piston. The ink storage cylinder is located on the base. The ink storage cylinder has an ink storage chamber inside. The front and rear ends of the ink storage cylinder are respectively provided with an ink inlet and a piston adapter port. The ink inlet and the piston adapter port are both connected to the ink storage chamber. The ink storage chamber is connected to the transfer port through the ink inlet. The front part of the cylinder piston extends into the ink storage chamber through the piston adapter port. The rear part of the cylinder piston is connected to the front part of the linear transmission unit, and the servo motor drives the linear transmission unit to drive the cylinder piston to reciprocate back and forth relative to the ink storage chamber.

2. The ink-filling mechanism according to claim 1, characterized in that, The linear transmission unit includes a ball screw and a slide rail. The slide rail is disposed on the base and has a preset length in the front-rear direction of the base. The ball screw includes a screw and a ball bearing for bearing support of the screw. The rear end of the screw is connected to the drive end of the servo motor, and the front end of the screw extends forward beyond the front end face of the ball bearing. The ball bearing is slidably disposed on the slide rail, and the front part of the ball bearing is connected to the rear part of the cylinder piston.

3. The ink-filling mechanism according to claim 2, characterized in that, A connecting member is also provided between the ball bearing and the cylinder piston component. The rear end of the connecting member is connected to the ball bearing, and the front end of the connecting member is connected to the rear part of the cylinder piston component.

4. The ink-filling mechanism according to claim 3, characterized in that, The connector has a rearward-facing sleeve cavity. When the connector is connected to the ball bearing, the sleeve cavity is fitted with a screw that extends out of the front end face of the ball bearing. A gap is left between the inner wall of the sleeve cavity and the screw.

5. The ink-filling mechanism according to any one of claims 2-4, characterized in that, It also includes a first proximity switch disposed on the base, the position of the first proximity switch corresponding to the preset forward position of the ball bearing; And / or, It also includes a second proximity switch disposed on the base, the position of which corresponds to a preset rearward position of the ball bearing.

6. The ink-filling mechanism according to any one of claims 2-4, characterized in that, A bearing connector is also provided between the servo motor and the screw, and the screw is connected to the drive end of the servo motor through the bearing connector.

7. The ink-filling mechanism according to any one of claims 1-4, characterized in that, The one-way valve also has an ink inlet assembly cavity for installing the ink inlet assembly. The inner end face of the ink inlet assembly cavity has an ink inlet port that communicates with the valve chamber, and the outer end face of the ink inlet assembly cavity has an ink inlet opening. The ink inlet assembly includes an ink inlet connector, an ink inlet piston, and an ink inlet spring. The ink inlet connector is located at the ink inlet opening, and its inner end face is spaced apart from the inner end face of the ink inlet assembly cavity. The ink inlet connector has an ink inlet channel communicating with the ink inlet. The ink inlet piston is inserted into the inner end opening of the ink inlet channel, and its inner end is spaced apart from the inner end face of the ink inlet assembly cavity. The two ends of the ink inlet spring abut against the inner end face of the ink inlet assembly cavity and the ink inlet piston, respectively.

8. The ink-filling mechanism according to any one of claims 1-4, characterized in that, The one-way valve also has an ink outlet assembly cavity for installing the ink outlet assembly. The inner end face of the ink outlet assembly cavity has an ink outlet that communicates with the valve chamber, and the outer end face of the ink outlet assembly cavity has an ink outlet opening. The ink dispensing assembly includes an ink dispensing connector, an ink dispensing piston, and an ink dispensing spring. The ink dispensing connector is located at the ink dispensing opening, and its inner end face is spaced apart from the inner end face of the ink dispensing assembly cavity. The ink dispensing connector has an ink dispensing channel communicating with the ink dispensing port in its middle part. The ink dispensing piston is inserted into the ink dispensing port, and its outer end is spaced apart from the inner end face of the ink dispensing connector. The two ends of the ink dispensing spring abut against the inner end face of the ink dispensing connector and the ink dispensing piston, respectively.

9. The ink-filling mechanism according to any one of claims 1-4, characterized in that, The ink inlet assembly and the ink outlet assembly are arranged vertically, and the transfer port is located between the ink inlet assembly and the ink outlet assembly.

10. The ink-filling mechanism according to any one of claims 1-4, characterized in that, The inner diameter of the ink storage chamber is larger than the inner diameter of the transfer port; and / or, The cylinder piston assembly has a first sealing element at its front, which is used to seal the gap between the cylinder piston assembly and the ink storage chamber; and / or A second sealing element is also provided between the piston fitting port and the cylinder piston.

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