Inkjet printer drop generator

Abstract

The application discloses a kind of ink-jet printer ink drop generators, which can be adapted to other ink-jet nozzle caliber nozzle.A kind of ink-jet printer ink drop generator, including generator cavity, generator cavity is provided with through jet cavity, generator cavity is also provided with ink inlet and backflow hole, and the ink inlet and backflow hole are connected with jet cavity, and the upper part of generator cavity is provided with crystal oscillator, and the crystal oscillator has crystal oscillator rod, and the crystal oscillator rod is partially inserted into jet cavity, and the gland for fixing crystal oscillator is fixedly connected with generator cavity, and the lower end of generator cavity is fixed with lower cover, and the nozzle is provided on the lower cover, and the nozzle is opposite to the crystal oscillator rod, and the length of the crystal oscillator rod inserted into jet cavity is 13-17mm, and the distance between the lower end surface of the crystal oscillator rod and the pressing piece of the nozzle is 10.5mm-6.5mm.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ink-jet printer, in particular to an ink droplet generator of ink-jet printer. BACKGROUND

[0002] The ink droplet generator of ink-jet printer is a component of ink-jet printer, which uses resonance to make ink form ink droplet and spray out.

[0003] In the prior art, the ink droplet generator of ink-jet printer includes a generator cavity, the generator cavity is provided with a spray cavity, the upper part of the spray cavity is fixed with a crystal oscillator, the crystal oscillator rod of the crystal oscillator is inserted into the spray cavity, and the lower part of the generator cavity is fixed with a nozzle.

[0004] In work, the ink is pushed into the spray cavity by compressed air, flows through the crystal oscillator rod and is cut off by high-frequency sound waves, and then forms an equidistant, equal size and equal frequency ink particle flow after being sprayed out of the ink ejection hole of the nozzle.

[0005] In the structure of the ink droplet generator of ink-jet printer, the inner diameter of the spray cavity, the size of the crystal oscillator rod and the ejection hole diameter of the nozzle are fixed and matched. When another specification of ejection hole diameter is needed, the nozzle with the required ejection hole diameter is not directly replaced, and it is recognized in the industry that the inner diameter of the spray cavity and the frequency of the oscillator need to be redesigned to adapt to the new ejection hole diameter. That is, in the prior art, after the frequency of the oscillator and the inner diameter of the spray cavity are set, they cannot be applied to multiple specifications of ejection holes, otherwise qualified ink droplets cannot be sprayed out of the ejection hole. SUMMARY

[0006] The purpose of the present application is to provide an ink droplet generator of ink-jet printer which can adapt to nozzles with other ejection hole diameters.

[0007] To solve the above technical problems, the technical solution adopted by the present application is:

[0008] An ink droplet generator of ink-jet printer, comprising a generator cavity, the generator cavity is provided with a through spray cavity, the generator cavity is further provided with an ink inlet hole and a backflow hole, the ink inlet hole and the backflow hole are connected with the spray cavity, the upper part of the generator cavity is provided with a crystal oscillator, the crystal oscillator has a crystal oscillator rod, the crystal oscillator rod partially extends into the spray cavity, a gland for fixing the crystal oscillator is fixedly connected with the generator cavity, the lower end of the generator cavity is fixed with a lower cover, the lower cover is provided with a nozzle, the nozzle is opposite to the crystal oscillator rod, the length of the crystal oscillator rod inserted into the spray cavity is 13-17mm, and the distance between the lower end surface of the crystal oscillator rod and the pressing piece of the nozzle is 10.5mm-6.5mm.

[0009] On the basis of the above scheme and as a preferred scheme of the above scheme: the crystal oscillator rod has a base, the lower part of the base has a neck, the lower part of the neck has a rod, the neck and the rod extend into the spray cavity, a sealing ring is sleeved on the neck, and the neck and the side wall of the spray cavity are sealingly connected through the sealing ring.

[0010] In the above scheme and as a preferred scheme of the above scheme: the upper part of the generator cavity is provided with a countersunk hole, the countersunk hole is coaxially arranged with the spray cavity, the bottom of the countersunk hole is in hard contact with the base, and the gland has a convex edge which is pressed against the base to press the base tightly on the bottom of the countersunk hole.

[0011] In the above scheme and as a preferred scheme of the above scheme: the distance from the lower surface of the base to the lower end surface of the rod part is 13.18±0.03 mm, and the distance between the lower end surface of the rod part and the pressing part of the nozzle is 7.5±0.5 mm.

[0012] In the above scheme and as a preferred scheme of the above scheme: the length of the neck part is 1±0.03 mm, and the diameter of the neck part is 2.80±0.02 mm; the length of the rod part 10 is 12.10±0.05 mm, and the diameter of the rod part 10 is 2.50±0.02 mm.

[0013] In the above scheme and as a preferred scheme of the above scheme: the diameter of the spray cavity is 3.20±0.05 mm.

[0014] In the above scheme and as a preferred scheme of the above scheme: the backflow hole is arranged obliquely, and the outer end of the backflow hole is higher than the inner end.

[0015] In the above scheme and as a preferred scheme of the above scheme: the diameter of the ink ejection hole on the nozzle is 38-65 microns.

[0016] In the above scheme and as a preferred scheme of the above scheme: the lower end of the generator cavity is provided with a boss, the spray cavity axially penetrates the boss, the lower cover is provided with a mounting cavity, the boss is sleeved with the mounting cavity, the bottom of the mounting cavity is provided with an assembly cavity, the assembly cavity is in communication with the mounting cavity, the nozzle is threadedly connected in the assembly cavity, the boss is further provided with a recessed cavity, a gasket is arranged in the recessed cavity, and the bottom of the gasket is exposed from the recessed cavity to abut against the bottom wall of the mounting cavity and the top wall of the nozzle.

[0017] In the above scheme and as a preferred scheme of the above scheme: the outer part of the boss is sleeved with a bottom sealing ring, and the lower cover and the generator cavity are sealingly connected through the bottom sealing ring.

[0018] The technical effects of the present application are as follows:

[0019] The ink drop generator of the inkjet printer adopts the structure that the length of the crystal oscillator rod inserted into the spray cavity is 13-17 mm and the distance between the lower end surface of the crystal oscillator rod and the pressing part of the nozzle is 10.5-6.5 mm, so that the ink drop generator of the inkjet printer can drive various specifications of nozzles. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a cross-sectional view of the present invention.

[0022] Figure 3 This is a partial structural cross-sectional view of the present invention.

[0023] Figure 4 This is a cross-sectional view of the crystal oscillator rod of the present invention.

[0024] Figure 5 This is an ink droplet observation diagram of Example 1 of the present invention.

[0025] Figure 6 This is a diagram of ink droplet observations from Comparative Example 1.

[0026] Figure 7 This is a diagram of ink droplet observations from Comparative Example 2.

[0027] Figure 8 This is a diagram of ink droplet observations in Comparative Example 3.

[0028] Figure 9 This is a diagram of ink droplet observations in Comparative Example 4.

[0029] In the diagram, 1. Generator cavity; 2. Spray chamber; 3. Ink inlet; 4. Return hole; 5. Countersunk hole; 6. Crystal oscillator; 7. Rim; 8. Base; 9. Neck; 10. Rod; 11. Sealing ring; 12. Side wall; 13. Lower cover; 14. Nozzle; 15. Boss; 16. Mounting cavity; 17. Assembly cavity; 18. Recessed cavity; 19. Washer; 20. Bottom sealing ring; 21. Crystal oscillator rod; 22. Pressure cap; 141. Pressure piece; 142. Nozzle plate; 143. Pressure piece gasket; 144. Inkjet hole; 145. Nozzle housing. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the given embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In the description of the present application, the terms "first", "second", and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0033] The present application discloses a kind of inkjet printer ink drop generator, including generator cavity 1, generator cavity 1 is provided with through jet cavity 2, in the embodiment, the diameter 3.20±0.05 millimeter of the jet cavity 2.As shown in l, the upper end and the lower end of jet cavity 2 both have opening.Generator cavity 1 is also provided with ink inlet hole 3 and backflow hole 4.Ink inlet hole 3 and backflow hole 4 are all connected with jet cavity 2.In specific application, ink is sent into jet cavity 2 by compressed air.After inkjet printer ink drop generator works, residual ink in jet cavity 2 is recycled using negative pressure.In an embodiment, the backflow hole 4 is inclined, and the outer end of backflow hole 4 is higher than the inner end.

[0034] The upper part of generator cavity 1 is provided with crystal oscillator 6.Crystal oscillator 6 frequency is 86000-92000Hz after being connected to driving power supply, corresponding, inkjet printer ink drop generator outputs 86000-92000 ink drops per second.Crystal oscillator 6 has crystal oscillator rod 21, and crystal oscillator rod 21 partially extends into jet cavity 2.In the embodiment, crystal oscillator rod 21 is the component of crystal oscillator 6.

[0035] The crystal oscillator 6 is fixed to the generator cavity 1. In the present embodiment, the crystal oscillator 6 is fixed to the upper portion of the generator cavity 1 by means of the gland 22. As shown in the figure, the gland 22 is fixed by means of screws. In the present embodiment, the upper portion of the generator cavity 1 is provided with a counterbore 5 coaxial with the spray cavity 2, the counterbore 5 being in communication with the spray cavity 2 for the insertion of the crystal oscillator stem 21 into the spray cavity 2. As shown in the figure, the bottom of the counterbore 5 is in hard contact with the base 8. In the description of the present embodiment, hard contact means that no elastic material such as a sealing ring is provided between the base 8 and the bottom of the counterbore 5. The gland 22 has a flange 7 which presses against the base 8 and presses it against the bottom of the counterbore 5. In the present embodiment, the crystal oscillator stem 21 has a base 8, below which is a neck 9, and below which is a stem 10. The base 8, the neck 9 and the stem 10 are of unitary construction. In the present embodiment, the length dl of the neck 9 is 1 ± 0.03 mm, and the diameter Φl of the neck 9 is 2.80 ± 0.02 mm. The length d2 of the stem 10 is 12.10 ± 0.05 mm, the diameter Φ2 of the stem 10 is 2.50 ± 0.02 mm, and the distance d3 from the lower surface of the base 8 to the lower end surface of the stem 10 is 13.18 ± 0.03 mm, i.e. the length of the insertion of the crystal oscillator stem 21 into the spray cavity 2.

[0036] The neck 9 is provided with a sealing ring 11. In the present embodiment, the base 8 is in hard contact with the bottom of the counterbore 5, and the sealing between the base 8 and the bottom of the counterbore 5 is weak. By providing the sealing ring 11 on the neck 9, the neck 9 is sealed to the side wall 12 of the spray cavity 2 by means of the sealing ring 11. In the present embodiment, since the sealing ring 11 is provided at a position between the hole wall of the through hole and the neck 9, the crystal oscillator 6 and the generator cavity 1 are sealed, and the oscillation of the crystal oscillator 6 is not affected.

[0037] The lower end of the generator cavity 1 is fixed with a lower cover 13, and a nozzle 14 is arranged on the lower cover 13, which is opposite to the crystal vibrating rod 21. In the embodiment, the nozzle 14 comprises a pressing piece 141, a nozzle piece 142, a pressing piece gasket 143 and a nozzle body 145, wherein the nozzle piece 142 is provided with an ink ejection hole 144. The nozzle 14 with the structure is not different from the prior art, and will not be described in detail here. The lower end of the generator cavity 1 is provided with a boss 15, the spray cavity 2 axially penetrates the boss 15, the lower cover 13 is provided with a mounting cavity 16, the boss 15 is sleeved with the mounting cavity 16, the bottom of the mounting cavity 16 is provided with an assembly cavity 17, the assembly cavity 17 is communicated with the mounting cavity 16, the nozzle 14 is threadedly connected in the assembly cavity 17, the boss 15 is further provided with a recessed cavity 18, the gasket 19 is arranged in the recessed cavity 18, the gasket is an annular structure, and the bottom of the gasket is exposed from the recessed cavity 18 to abut against the bottom wall of the mounting cavity 16 and the top wall of the nozzle 14. In the embodiment, the structure of the gasket 19 is adopted, one end of which abuts against the generator cavity 1, and the other end abuts against the lower cover 13 and the nozzle 14. Since the gasket 19 is a rigid structure and will not be compressed due to the locking force between the lower cover 13 and the generator cavity 1, the distance d4 between the lower end surface of the rod part 10 and the pressing piece 141 of the nozzle 14 is a fixed distance after the lower cover is locked. In the embodiment, the distance between the lower end surface of the rod part 10 and the pressing piece 141 of the nozzle 14 is 7.5±0.5mm. As shown in the figure, the outer part of the boss 15 is sleeved with a bottom sealing ring 20, and the lower cover 13 and the generator cavity 1 are sealingly connected through the bottom sealing ring 20. By adopting the assembly structure of the bottom sealing ring 20 and the gasket 19, the distance between the lower end surface of the rod part 10 and the pressing piece 141 of the nozzle 14 can be ensured to be constant, and the lower cover 13 and the generator cavity 1 can be sealingly assembled.

[0038] As other embodiments, only the length of the crystal vibrating rod 21 inserted into the spray cavity 2 and the distance between the crystal oscillator 6 and the nozzle 14 are changed on the basis of the above-mentioned embodiments, and the specifications of the nozzle 14 that can be adapted are as follows:

[0039]

[0040] In the table, the symbol “—” represents any value within the numerical range.

[0041] It should be pointed out that in the above table, the length of the crystal vibrating rod 21 inserted into the spray cavity 2 is the distance between the lower surface of the base part 8 and the lower end surface of the rod part 10. The distance between the crystal oscillator 6 and the nozzle 14 is the distance between the lower end surface of the rod part 10 and the pressing piece 141 of the nozzle 14; and the specification of the nozzle 14 that can be driven is the nozzle 14 that can assemble the ink ejection hole diameter specification shown in the above table, and still qualified ink droplets can be obtained, such as Figure 5 shown.

[0042] Using a 40-micron nozzle 14, the length of the crystal 6 inserted into the ejection chamber 2 or the distance from the crystal 6 to the nozzle 14 was changed, and the ink droplets were observed using an ink droplet observer as shown in the following table.

[0043]

[0044] The above embodiments are merely preferred embodiments of the present application and are not intended to limit the protection scope of the present application, and thus: any equivalent changes made in the structure, shape, principle, etc. of the present application should be encompassed within the protection scope of the present application.

Claims

1. A droplet generator for an inkjet printer, comprising a generator cavity, the generator cavity having a through-hole spray chamber, an ink inlet and a return hole on the generator cavity, both the ink inlet and the return hole being connected to the spray chamber, a crystal oscillator being disposed at the upper part of the generator cavity, the crystal oscillator having a crystal rod, the crystal rod extending into the spray chamber, a pressure cap for fixing the crystal oscillator being fixedly connected to the generator cavity, a lower cover being fixed at the lower end of the generator cavity, a nozzle being disposed on the lower cover, the nozzle being opposite to the crystal rod, characterized in that: The length of the crystal oscillator rod inserted into the spray cavity is 13-17 mm, and the distance between the lower end face of the crystal oscillator rod and the pressure part of the nozzle is 10.5 mm-6.5 mm. By changing the length of the crystal oscillator rod inserted into the spray cavity and the distance between the crystal oscillator and the nozzle, various nozzle specifications can be adapted.

2. The ink droplet generator for inkjet printers according to claim 1, characterized in that: The crystal oscillator rod has a base, a neck below the base, and a rod below the neck. The neck and rod extend into the spray cavity. A sealing ring is fitted on the neck, and the neck and the side wall of the spray cavity are sealed together by the sealing ring.

3. The ink droplet generator for inkjet printers according to claim 2, characterized in that: The upper part of the generator cavity is provided with a countersunk hole, which is coaxially arranged with the spray cavity. The bottom of the countersunk hole allows for hard contact with the base. The pressure cap has a raised edge, which presses against the base and presses it tightly against the bottom of the countersunk hole.

4. The ink droplet generator for a coding machine according to claim 2, characterized in that: The distance from the lower surface of the base to the lower end face of the rod is 13.18±0.03 mm, and the distance between the lower end face of the rod and the pressure member of the nozzle is 7.5±0.5 mm.

5. The ink droplet generator for a coding machine according to claim 2, characterized in that: The length of the neck is 1±0.03 mm and the diameter of the neck is 2.80±0.02 mm; the length of the rod is 12.10±0.05 mm and the diameter of the rod is 2.50±0.02 mm.

6. The ink droplet generator for a coding machine according to claim 1, characterized in that: The diameter of the spray chamber is 3.20 ± 0.05 mm.

7. The ink droplet generator for a coding machine according to claim 1, characterized in that: The reflux hole is inclined, and the outer end of the reflux hole is higher than the inner end.

8. The ink droplet generator for a coding machine according to claim 1, characterized in that: the diameter of the inkjet nozzle is 38 micrometers to 65 micrometers.

9. The ink droplet generator for a coding machine according to claim 1, characterized in that: a boss is provided at the lower end of the generator cavity, the spray chamber axially penetrates the boss, the lower cover is provided with a mounting cavity, the boss is sleeved with the mounting cavity, an assembly cavity is provided at the bottom of the mounting cavity, the assembly cavity is connected to the mounting cavity, the nozzle is threadedly connected to the assembly cavity, a recessed cavity is also provided on the boss, a washer is provided in the recessed cavity, the bottom of the washer protrudes from the recessed cavity so that the bottom wall of the mounting cavity and the top wall of the nozzle abut against each other.

10. The ink droplet generator for a coding machine according to claim 9, characterized in that: a bottom sealing ring is sleeved on the outside of the boss, and the lower cover and the generator body are connected in a sealed manner through the bottom sealing ring.

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