Piezoelectric ink-jet printing head capable of preventing ink dripping and overflowing and working method of piezoelectric ink-jet printing head
By using a three-way reversing valve, pneumatic cylinder and mechanical transmission structure in the inkjet print head, the problems of excessive air pressure and ink residue during inkjet printing are solved, and the effective absorption and emission of ink are achieved to prevent pollution.
Patent Information
- Application Number
- CN202411198170.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2024-12-20
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During the inkjet printing process, the space of the secondary ink cartridge becomes smaller, resulting in excessive air pressure, causing ink to eject from the inkjet hole of the print head, and the ink remains after printing, causing contamination.
A piezoelectric inkjet printhead including a printhead body and a secondary ink cartridge is designed, and a structure adopts a three-way reversing valve, a pneumatic cylinder and a piston, a rotating teeth, a rotating arm, a support plate, a guide rod and an ink-absorbing sponge. Effective absorption and emission of ink are achieved through pneumatic pressure regulation and mechanical transmission.
The air pressure in the secondary ink cartridge is effectively adjusted to prevent ink from ejecting, and the remaining ink after printing is absorbed through the mechanical structure to prevent contamination.
Smart Images
Figure CN119159908A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of printers, and in particular to a piezoelectric inkjet print head capable of preventing ink dripping or overflowing, and a working method thereof. Background Art
[0002] Inkjet printing is usually done using drop-on-demand or continuous inkjet printing. In drop-on-demand printing, droplets are ejected onto a recording medium using a drop ejector with a pressurized (e.g., thermal or piezoelectric) actuator.
[0003] During the process of refilling the secondary ink cartridge, the space inside the secondary ink cartridge becomes smaller, causing the air pressure inside the secondary ink cartridge to increase. The excessive pressure causes the ink to be ejected from the inkjet holes of the print head body. At the same time, after printing is completed, some ink remains in the inkjet holes of the print head body, which drips onto the product or equipment and causes pollution to the product or equipment. Summary of the invention
[0004] The problem to be solved by the present invention is to provide a piezoelectric inkjet print head and a working method thereof that can prevent ink dripping and overflowing, thereby solving the technical problem that during the process of adding ink to the secondary ink cartridge, the space inside the secondary ink cartridge becomes smaller, resulting in an increase in the air pressure inside the secondary ink cartridge. The excessive pressure causes the ink to be sprayed out from the inkjet holes of the print head body. At the same time, after printing is completed, some ink remains at the inkjet holes of the print head body, which drips onto the product or equipment, causing pollution to the product or equipment.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] A piezoelectric inkjet print head for preventing ink dripping and overflowing comprises a print head body and a secondary ink cartridge, wherein the secondary ink cartridge is mounted on the top of the print head body, a pressure regulating cylinder is mounted on the side wall of the secondary ink cartridge, and a three-way reversing valve is mounted between the secondary ink cartridge and the pressure regulating cylinder, an air cylinder is mounted on the outer end of the pressure regulating cylinder, and a piston is mounted on the telescopic end of the air cylinder in the pressure regulating cylinder.
[0007] Preferably, a first rotating tooth and a second rotating tooth are rotatably mounted on both ends of the print head body, and the first rotating tooth and the second rotating tooth are meshed with each other.
[0008] Preferably, a mounting plate is installed at one end of the print head body, a motor is installed on the mounting plate, and an output end of the motor is connected to the second rotating gear.
[0009] Preferably, the first rotating teeth are mounted with first rotating arms via a rotating shaft, a connecting seat is mounted between the two first rotating arms, and a slope is arranged on the connecting seat.
[0010] Preferably, a second rotating arm is installed on the second rotating tooth, and a support plate is installed between the two second rotating arms, and a plurality of guide rods are installed through the support plate.
[0011] Preferably, an adjustment plate is installed at the inner end of a plurality of the guide rods, and an ink absorbing sponge is installed on the adjustment plate.
[0012] Preferably, wheel seats are installed at the outer ends of the guide rods, and several rollers are installed on the wheel seats. A spring is sleeved on the outer side of the guide rods and located between the support plate and the wheel seat.
[0013] A working method of a piezoelectric inkjet print head for preventing ink dripping and overflowing, the specific operating steps of the working method are as follows:
[0014] Step 1: When adding ink to the secondary ink cartridge, the three-way reversing valve connects the secondary ink cartridge with the pressure regulating cylinder. The piston rod of the pneumatic cylinder contracts to drive the piston to move toward the pneumatic cylinder, and the air in the secondary ink cartridge is sucked into the pressure regulating cylinder. After the ink is added, the three-way reversing valve connects the pressure regulating cylinder with the outside world. At this time, the piston rod of the pneumatic cylinder extends to squeeze out the air in the pressure regulating cylinder.
[0015] Step 2: After printing is completed, the motor works to mobilize the second gear to rotate. At this time, the meshing first gear rotates synchronously. The first rotating arm drives the connecting seat to rotate toward the inkjet hole at the bottom of the print head body. The second rotating arm drives the support plate to rotate toward the inkjet hole at the bottom of the print head body. When the connecting seat and the support plate rotate close to the inkjet hole, the roller of the wheel seat contacts the slope and continues to move. The wheel seat drives the guide rod to move on the support plate to compress the spring. At this time, the adjustment plate and ink-absorbing sponge connected to the guide rod move up and contact the bottom side of the print head body to absorb the ink at the inkjet hole on the bottom side of the print head body. When printing again, the first rotating arm and the second rotating arm rotate to the initial position, and the compressed spring returns to its original position.
[0016] The beneficial effects of the present invention are as follows: during the process of adding ink to the secondary ink cartridge, the space inside the secondary ink cartridge becomes smaller, resulting in an increase in the air pressure inside the secondary ink cartridge. At this time, the piston rod of the pneumatic cylinder contracts and drives the piston to move toward the pneumatic cylinder, so that the air inside the secondary ink cartridge is sucked into the pressure regulating cylinder, thereby regulating the air pressure inside the secondary ink cartridge and preventing the ink from being ejected from the inkjet hole of the print head body due to excessive pressure.
[0017] Through the operation of the motor, the first gear and the second gear are meshed for transmission, and the first arm and the second arm rotate in opposite directions at the same speed. When the connecting seat and the support plate rotate close to the inkjet hole, the roller of the wheel seat contacts the slope and continues to move. The wheel seat drives the guide rod to move on the support plate to compress the spring. At this time, the adjustment plate and the ink-absorbing sponge connected to the guide rod move up and contact the bottom side of the print head body to absorb the ink at the inkjet hole on the bottom side of the print head body, thereby avoiding dripping of ink remaining at the bottom of the print head body after printing. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1It is a schematic diagram of the first structure of the present invention as a whole;
[0019] Figure 2 It is a cross-sectional view of the pressure regulating cylinder of the present invention;
[0020] Figure 3 It is a schematic diagram of the second structure of the present invention as a whole;
[0021] Figure 4 It is a schematic diagram of the ramp and roller structure of the present invention.
[0022] Legend:
[0023] 1. Print head body; 2. Secondary ink cartridge; 3. Pressure regulating cylinder; 4. Three-way reversing valve; 5. Pneumatic cylinder; 6. Piston rod; 7. Piston; 8. First rotating gear; 9. Rotating shaft; 10. Second rotating gear; 11. First rotating arm; 12. Connecting seat; 13. Ramp; 14. Second rotating arm; 15. Support plate; 16. Guide rod; 17. Adjustment plate; 18. Ink absorbing sponge; 19. Mounting plate; 20. Motor; 21. Wheel seat; 22. Roller; 23. Spring. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0025] Specific examples are given below.
[0026] See also Figure 1 to Figure 4 A piezoelectric inkjet print head for preventing ink dripping and overflowing comprises a print head body 1 and a secondary ink cartridge 2, wherein the secondary ink cartridge 2 is mounted on the top of the print head body 1, a pressure regulating cylinder 3 is mounted on the side wall of the secondary ink cartridge 2, and a three-way reversing valve 4 is mounted between the secondary ink cartridge 2 and the pressure regulating cylinder 3, an air cylinder 5 is mounted on the outer end of the pressure regulating cylinder 3, and a piston 7 is mounted in the pressure regulating cylinder 3 at the telescopic end of the air cylinder 5. When ink is added to the secondary ink cartridge 2, the three-way reversing valve 4 realizes the connection between the secondary ink cartridge 2 and the pressure regulating cylinder 3, and the piston rod 6 of the air cylinder 5 is contracted to drive the piston 7 to move toward the air cylinder 5, so that the air in the secondary ink cartridge 2 is sucked into the pressure regulating cylinder 3. After the ink is added, the three-way reversing valve 4 realizes the connection between the pressure regulating cylinder 3 and the outside, and the piston rod 6 of the air cylinder 5 is extended to squeeze out the air in the pressure regulating cylinder 3.
[0027] The first rotating gear 8 and the second rotating gear 10 are rotatably mounted at both ends of the print head body 1, and the first rotating gear 8 and the second rotating gear 10 are meshed with each other. A mounting plate 19 is mounted at one end of the print head body 1, and a motor 20 is mounted on the mounting plate 19. The output end of the motor 20 is connected to the second rotating gear 10. The first rotating gear 8 is mounted with a first rotating arm 11 through a rotating shaft 9. A connecting seat 12 is mounted between the two first rotating arms 11, and a slope 13 is arranged on the connecting seat 12. A second rotating arm 14 is mounted on the second rotating gear 10, and a supporting plate 15 is mounted between the two second rotating arms 14. A plurality of guide rods 16 are installed through the supporting plate 15, and an adjusting plate 17 is installed at the inner end of the plurality of guide rods 16. An ink absorbing sponge 18 is installed on the adjusting plate 17. A wheel seat 21 is mounted at the outer end of the plurality of guide rods 16, and a plurality of rollers 22 are mounted on the wheel seat 21. A spring is sleeved on the outer side of the guide rod 16 and located between the supporting plate 15 and the wheel seat 21. Spring 23, after printing is finished, the motor 20 works to mobilize the second rotating tooth 10 to rotate, at this time the meshing first rotating tooth 8 rotates synchronously, the first rotating arm 11 drives the connecting seat 12 to rotate toward the inkjet hole at the bottom of the print head main body 1, and the second rotating arm 14 drives the supporting plate 15 to rotate toward the inkjet hole at the bottom of the print head main body 1. When the connecting seat 12 and the supporting plate 15 rotate close to the inkjet hole, at this time the roller 22 of the wheel seat 21 contacts the ramp 13 and continues to move, the wheel seat 21 drives the guide rod 16 to move on the supporting plate 15 to compress the spring 23. At this time, the adjusting plate 17 and the ink absorbing sponge 18 connected to the guide rod 16 move up and contact the bottom side of the print head main body 1 to absorb the ink at the inkjet hole on the bottom side of the print head main body 1. When printing is performed again, the first rotating arm 11 and the second rotating arm 14 rotate to the initial position, and the compressed spring 23 is restored to its original position, driving the adjusting plate 17 and the ink absorbing sponge 18 back to their initial positions.
[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A piezoelectric inkjet print head for preventing ink dripping and overflowing, characterized in that: The invention comprises a print head body (1) and a secondary ink cartridge (2), wherein the secondary ink cartridge (2) is installed on the top of the print head body (1), a pressure regulating cylinder (3) is installed on the side wall of the secondary ink cartridge (2), and a three-way reversing valve (4) is installed between the secondary ink cartridge (2) and the pressure regulating cylinder (3), a pneumatic cylinder (5) is installed on the outer end of the pressure regulating cylinder (3), and a piston (7) is installed at the telescopic end of the pneumatic cylinder (5) located in the pressure regulating cylinder (3).
2. A piezoelectric inkjet print head for preventing ink dripping and overflowing according to claim 1, characterized in that: A first rotating tooth (8) and a second rotating tooth (10) are rotatably mounted on both ends of the print head body (1), and the first rotating tooth (8) and the second rotating tooth (10) are meshed with each other.
3. A piezoelectric inkjet print head for preventing ink dripping and overflowing according to claim 2, characterized in that: A mounting plate (19) is mounted on one end of the print head body (1), a motor (20) is mounted on the mounting plate (19), and an output end of the motor (20) is connected to the second rotating gear (10).
4. A piezoelectric inkjet print head for preventing ink dripping and overflowing according to claim 3, characterized in that: The first rotating tooth (8) is mounted with a first rotating arm (11) via a rotating shaft (9); a connecting seat (12) is mounted between the two first rotating arms (11); and a slope (13) is arranged on the connecting seat (12).
5. A piezoelectric inkjet print head for preventing ink dripping and overflowing according to claim 4, characterized in that: A second rotating arm (14) is installed on the second rotating tooth (10), and a support plate (15) is installed between the two second rotating arms (14). A plurality of guide rods (16) are installed through the support plate (15).
6. A piezoelectric inkjet print head for preventing ink dripping and overflowing according to claim 5, characterized in that: An adjusting plate (17) is installed at the inner end of a plurality of the guide rods (16), and an ink absorbing sponge (18) is installed on the adjusting plate (17).
7. A piezoelectric inkjet print head for preventing ink dripping and overflowing according to claim 6, characterized in that: The outer ends of the plurality of guide rods (16) are provided with wheel seats (21), and the wheel seats (21) are provided with a plurality of rollers (22). A spring (23) is sleeved on the outer sides of the guide rods (16) and located between the support plate (15) and the wheel seats (21).
8. The method for operating a piezoelectric inkjet print head for preventing ink dripping and overflowing according to claim 7, characterized in that: The specific steps of this working method are as follows: Step 1: When ink is added to the secondary ink cartridge (2), the three-way reversing valve (4) connects the secondary ink cartridge (2) with the pressure regulating cylinder (3), and the piston rod (6) of the pneumatic cylinder (5) contracts to drive the piston (7) to move toward the pneumatic cylinder (5), so that the air in the secondary ink cartridge (2) is sucked into the pressure regulating cylinder (3). After the ink is added, the three-way reversing valve (4) connects the pressure regulating cylinder (3) with the outside world, and the piston rod (6) of the pneumatic cylinder (5) extends to squeeze out the air in the pressure regulating cylinder (3); Step 2: After the printing is finished, the motor (20) operates to mobilize the second rotating tooth (10) to rotate, and the meshed first rotating tooth (8) rotates synchronously at this time, and the first rotating arm (11) drives the connecting seat (12) to rotate toward the inkjet hole at the bottom of the print head body (1), and the second rotating arm (14) drives the supporting plate (15) to rotate toward the inkjet hole at the bottom of the print head body (1). When the connecting seat (12) and the supporting plate (15) rotate close to the inkjet hole, the roller (22) of the wheel seat (21) and the ramp (13) are in contact with each other. ) contacts and continues to move, the wheel seat (21) drives the guide rod (16) to move on the support plate (15), compressing the spring (23), at which time the adjustment plate (17) and the ink-absorbing sponge (18) connected to the guide rod (16) move upward and contact the bottom side of the print head body (1), absorbing the ink at the inkjet hole on the bottom side of the print head body (1), and when printing is performed again, the first rotating arm (11) and the second rotating arm (14) rotate to the initial position, and the compressed spring (23) returns to its original position.