Three-roller printing core and seal containing the same

Abstract

A three-roller ink core and a seal containing the same, the structure comprising a first roller seat (1), a second roller seat (2) and a third roller seat (3), wherein the first roller seat (1), the second roller seat (2) and the third roller seat (3) are coaxially arranged side by side; a pressing assembly (a) is arranged inside the first roller seat (1), the second roller seat (2) and the third roller seat (3), and the pressing assembly (a) is used to drive the second roller seat (2) and the third roller seat (3) to rotate circumferentially relative to the first roller seat (1), and simultaneously drive the second roller seat (2) and the third roller seat (3) to rotate circumferentially relative to each other; the scheme of the present application has the advantages of making the printing content that can be changed and adjusted more diverse, making the adjustment of the printing content more convenient and labor-saving, and realizing the change combination of multiple different contents by simply pressing a button.

Description

Technical Field

[0001] The present application relates to the technical field of quick stamps, and specifically refers to a three-roller stamp core and a stamp containing the same that can realize quick paper printing of mathematical formulas, numbers or other graphics. Background Art

[0002] At present, there is a roller stamp on the market. This stamp is a teaching or learning tool for quickly printing content. It can quickly print mathematical formulas, numbers or other graphics on paper by rolling. This stamp can be reused and can also increase the fun of learning, thereby helping users to learn quickly and conveniently.

[0003] The structure of the existing roller seal generally includes two coaxially arranged roller parts and an external shell part. The pattern, number, etc. to be printed are engraved on the outer surface of the roller, and the content thereon is printed on the paper through the synchronous circumferential rotation of the two rollers; however, the content printed on the two rollers is fixed (that is, the content on the two rollers is axially aligned, and once the engraving is completed during production, it cannot be adjusted), and is limited to the different contents that can be printed within the circumferential area of ​​the rollers, and the printed content cannot be replaced. The limited area of ​​the rollers also makes it impossible to print infinitely, which makes the content of the existing seal tool unable to be replaced and relatively single (after rolling one circle, the content of the next circle will be repeated continuously) Or although the two rollers can rotate relative to each other to realize the change and adjustment of the printed content, the converted printed content is fixed by the engagement of a spring sheet and a groove (for example, a coaxial three-roller seal disclosed in CN216993646U is a method of engagement of a spring sheet and a groove). In this method, the engagement force of the spring sheet and the groove needs to be overcome during the relative rotation of the two rollers, and the required rotation force is relatively large (not suitable for children to operate). Moreover, such rotation for a long time will cause the engagement force between the spring sheet and the groove to decrease (the engagement groove is constantly worn), making it impossible to align the contents on the two rollers and affecting printing, and it is also easy to cause the printed content to be skewed and uneven.

[0004] In addition, most of the existing seal tools are composed of two rollers. After the content to be printed is divided on the two rollers, although the relative rotation can be achieved through the structure of the spring piece and the groove engagement and disengagement to achieve the change and adjustment of the content, the scope of its change is still limited to the arrangement and combination of the engraved content on the two rollers. Therefore, there are still certain shortcomings in the content that can be replaced. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present application provides a three-roller printing core that can make the change and adjustment of printing content more diverse, and the adjustment of printing content is more convenient and labor-saving, and a variety of change combinations of different contents can be achieved by simply pressing a button.

[0006] In order to solve the above technical problems, the technical solution adopted in the present application is: a three-roller printing core, which structure includes a first roller seat, a second roller seat and a third roller seat, and the first roller seat, the second roller seat and the third roller seat are coaxially arranged side by side; a pressing assembly is arranged in the first roller seat, the second roller seat and the third roller seat, and the pressing assembly is used to drive the second roller seat and the third roller seat to rotate circumferentially relative to the first roller seat, and at the same time drive the second roller seat and the third roller seat to rotate circumferentially relative to each other.

[0007] With the above structure, the present application sets a pressing component in the printing core, and by pressing the component, the second roller seat and the third roller seat can be made to rotate circumferentially relative to the first roller seat, thereby realizing the change of the graphic content on the three roller seats, so that the content of the three roller seats set relatively to each other changes, and each pressing can achieve a content change, thereby realizing the conversion of content. Unlike the traditional double-roller seal structure, which is limited to the amount of circumferentially printed content, the present application can change once by pressing once, which effectively improves the diversity of content. In addition, the present application sets three coaxially arranged roller seats. , wherein the second roller seat and the third roller seat can rotate circumferentially relative to each other, and can also rotate circumferentially relative to the first roller seat, so that the contents to be printed distributed outside the three roller seats can be replaced with each other in more ways. Compared with the structure of two rollers, the types of change arrangements and combinations are more, so the printable contents can be further enriched; in addition, the three-roller printing core of the present application can achieve the above-mentioned specific rotation method by pressing the assembly. Compared with the existing structure of the spring sheet and the groove clamping force, the circumferential relative rotation force is lighter and more labor-saving, more suitable for children to operate, and easier and faster to operate.

[0008] Furthermore, the first roller seat, the second roller seat and the third roller seat described in the present application are provided with an accommodating space along the axial direction, and the pressing assembly includes a button at the outer end of the third roller seat and a pressing shaft located in the accommodating space; a fourth roller seat is arranged between the second roller seat and the pressing shaft, and a fifth roller seat is arranged between the third roller seat and the pressing shaft; an elastic member is arranged between the pressing shaft and the first roller seat; the button abuts against the pressing shaft and can drive the pressing shaft to move axially, and the pressing shaft drives the fourth roller seat to drive the second roller seat, and drives the fifth roller seat to drive the third roller seat to rotate circumferentially during the axial movement process. , and the fourth roller seat and the fifth roller seat rotate in opposite directions circumferentially; the above-mentioned structure of the present application can realize the forward and backward movement of the pressing shaft in the axial direction by pressing the button with external force, and realize the resetting of the pressing shaft in combination with the elastic member without the action of pressing force. This process realizes the circumferential rotation of the fourth roller seat and the fifth roller seat, and the reverse rotation between the two, so that the second roller seat and the third roller seat can rotate relative to the first roller seat in the circumferential direction, and the second roller seat and the third roller seat rotate in opposite directions at the same time, so that two of the three rollers can rotate at the same time, so that the types of changes in the content to be printed engraved on the outer sides of the three rollers are more, providing more diverse printing effects.

[0009] Furthermore, a first protrusion and a second protrusion are provided on the outer wall of the pressing shaft, the first protrusion is located at the connection between the second roller seat and the fifth roller seat, and the second protrusion is close to the button end; a first oblique tooth is provided at the front end of the fourth roller seat, and a second oblique tooth is provided at the front end of the fifth roller seat; a first slide groove for the first protrusion to slide into is provided on the inner wall of the connection end between the second roller seat and the fifth roller seat, and a second slide groove for the second protrusion to slide into is provided on the inner wall of the third roller seat; the notch of the first slide groove and the notch of the second slide groove are both provided with a notch for the first protrusion to slide into. The protrusion abuts against the inclined surface, the tip of the inclined surface is close to the side of the corresponding helical tooth for the protrusion to abut against and press (that is, the tip of the inclined surface of the slot is close to the side of the corresponding helical tooth for the protrusion to abut against and press), and the first helical tooth and the second helical tooth are respectively used to be inclined in the opposite direction to the helical tooth surface against which the first protrusion and the second protrusion are pressed (that is, the first helical tooth and the second helical tooth are respectively used to be inclined in the opposite direction to the helical tooth surface against which the corresponding protrusion abuts); using the above structure, the application moves the pressing axis toward the first roller seat by pressing the button, and at this time the first protrusion thereon will move along the second The first slide groove approaches the helical teeth of the fourth roller seat and gradually approaches the helical tooth surface of the helical teeth. Similarly, the second protrusion will also approach the helical teeth of the fifth roller seat along the second slide groove and gradually approach the helical tooth surface of the helical teeth. If the pressure is continued, the first protrusion and the second protrusion will gradually reach the tooth root of the helical teeth along the helical tooth surface of the corresponding helical teeth. In this process, the fourth roller seat rotates circumferentially under the axial pressing force of the first protrusion and the tooth surface of the helical teeth, and at the same time drives the second roller seat to rotate circumferentially. Similarly, the fifth roller seat rotates circumferentially under the axial pressing force of the second protrusion and the tooth surface of the helical teeth, and at the same time drives the third roller seat to rotate circumferentially. The fourth roller seat and the fifth roller seat rotate circumferentially together, and since the first bevel tooth and the second bevel tooth are used to press the bevel tooth surfaces against the first protrusion and the second protrusion in opposite directions, the fourth roller seat and the fifth roller seat are pressed and rotated circumferentially by the first protrusion and the second protrusion respectively, which will inevitably cause the two to rotate circumferentially in opposite directions. The above rotation realizes the change of the content to be printed engraved on the outside of the second roller seat and the third roller seat; and the inclined surface of the slide groove is aligned with the tooth root of the bevel tooth, that is, the axially aligned position of the tooth root of the bevel tooth falls within the inclined surface range of the slide groove, which can guide the protrusion to be effectively reset to realize the subsequent circumferential drive.

[0010] Furthermore, the first protrusion and the second protrusion are both cylindrical and extend radially outward along the outer wall of the pressing shaft, and the axis of the cylindrical first protrusion and the second protrusion (the axis of the cylinder) is misaligned with the tooth tip of the corresponding helical tooth (that is, the axis of the cylinder and the axial direction of the tooth tip of the helical tooth are not in a straight line, but are closer to the side of the helical tooth surface that the protrusion needs to press against); with the above structure, the cylindrical protrusion is smoother in the process of pressing the tooth surface of the helical tooth of the roller seat and is not easy to get stuck; and the axis of the protrusion is misaligned with the tooth tip of the helical tooth, which can ensure that the protrusion is easier to maintain alignment with the tooth surface of the helical tooth to be pressed during the pressing process, thereby achieving precise pressing, and the second and subsequent pressings after resetting can also realize circumferential drive of the corresponding roller seat.

[0011] Furthermore, the inclined surfaces on both sides of the tooth tips of the first bevel tooth and the second bevel tooth are both small on one side and large on the other side, the first protrusion and the second protrusion are used to press against the large bevel, and the inclination directions of the large bevels of the first bevel tooth and the second bevel tooth are opposite (the axes of the cylindrical first protrusion and the second protrusion are located on the large bevel side along the axial direction of the roller seat); with the above structure, the pressing against the large bevel can make the fourth and fifth roller seats have sufficient circumferential rotation angles, and the provision of large and small bevels can also make it easier for the protrusions to always drive the corresponding roller seats to rotate circumferentially in the same direction, that is, the roller seat driven by the first protrusion is always opposite to the circumferential rotation direction of the roller seat driven by the second protrusion; in addition, the axes of the cylindrical first protrusion and the second protrusion are located on the large bevel side along the axial direction of the roller seat, so that the secondary pressing of the protrusion reset can always press against the large tooth surface of the corresponding bevel tooth.

[0012] Furthermore, the inclination direction of the inclination direction of the inclination direction of the inclination surface of the first slide groove notch for the first protrusion of the first inclination tooth is opposite to the inclination direction of the inclination direction of the inclination surface of the first slide groove notch, and the inclination direction of the inclination direction of the inclination surface of the second inclination tooth for the second protrusion of the second inclination tooth is opposite to the inclination direction of the inclination surface of the second slide groove notch; with the above structure, when the protrusion presses the corresponding inclination tooth surface to the tooth root position and then resets, it will gradually approach the inclination surface corresponding to the slide groove notch until it abuts and presses. The arrangement can ensure that no matter whether the protrusion presses the bevel tooth surface or the inclined surface of the groove, the circumferential rotation direction of the driven roller seat can be consistent, and the protrusion can also be guided into the next circumferentially distributed slide groove arranged in sequence to ensure the accuracy of the second press; this is because after the button has no pressing force, the protrusion will drive the roller seat where the slide groove is located to rotate circumferentially again under the guidance of the inclined surface of the slide groove during the reset process driven by the elastic member, and the setting of the above structure ensures that the circumferential rotation of the roller seat corresponding to the pressing and resetting processes of the protrusion is in the same direction.

[0013] Furthermore, a third protrusion is also provided on the side wall of the pressing shaft, and the third protrusion is located at the connection between the first roller seat and the fourth roller seat, and a third sliding groove for the third protrusion to slide into is provided on the inner wall of the connecting end of the first roller seat and the fourth roller seat; when the button applies pressing force, the third protrusion gradually moves away from the third sliding groove on the side of the fourth roller seat and finally disengages from it; adopting the above structure, the present application can realize the pressing and elastic member reset process by setting the third protrusion, so that the pressing shaft only moves axially without circumferential rotation under the limitation of the third protrusion and the third sliding groove, and only makes the third roller seat and the second roller seat rotate circumferentially; and when the elastic member is in the reset state without the action of pressing force, the second roller seat and the first roller seat are circumferentially positioned with each other, and after the first protrusion is reset, the second roller seat and the third roller seat can also be circumferentially positioned, so that the three roller seats of the first, second and third rollers can maintain circumferential synchronization during the printing rolling process, and the printed content will not be skewed, and the printing is more neat.

[0014] Furthermore, the axial length of the third slide groove on the inner wall of the first roller seat is adapted to the axial compression distance of the elastic member; by adopting the above structure, after the third protrusion is separated from the fourth roller seat, it can always be in the third slide groove on the inner wall of the first roller seat, thereby realizing the circumferential limiting effect of the third protrusion on the pressing shaft, ensuring that the pressing shaft only moves axially back and forth during the pressing and resetting process, and does not rotate circumferentially to affect the accurate resetting of the protrusion thereon.

[0015] Furthermore, the outer wall of the fourth roller seat is provided with a fourth protrusion, and the corresponding second roller seat is provided with a fourth slide groove which is plugged and matched with it; the outer wall of the fifth roller seat is provided with a fifth protrusion, and the corresponding third roller seat is provided with a fifth slide groove which is plugged and matched with it; adopting the above structure, a circumferential limiting connection between the fourth roller seat and the second roller seat, and a circumferential limiting connection between the fifth roller seat and the third roller seat are realized, and when the pressing component drives the fourth roller seat and the fifth roller seat to rotate circumferentially, the second roller seat and the third roller seat can be driven to rotate circumferentially synchronously at the same time.

[0016] Furthermore, the first protrusion, the second protrusion and the third protrusion are located on the same straight line in the axial direction, and the outer diameter of the outer wall where the second protrusion of the pressing shaft is located is larger than the outer diameter of the outer wall where the first protrusion is located, and the outer diameter of the outer wall where the first protrusion is located is larger than the outer diameter of the outer wall where the third protrusion is located; adopting the above structure, during the operation of the pressing assembly, it is ensured that when the fifth roller seat is driven circumferentially by the second protrusion and the fourth roller seat is driven circumferentially by the first protrusion, each protrusion slides synchronously in the same axial line in the corresponding slide groove, making the operation smoother; in addition, the unequal diameter setting of the pressing shaft can effectively save materials, save space and make the overall structure more compact.

[0017] Furthermore, the first slide groove, the second slide groove and the third slide groove are aligned in the axial direction; with this structure, the pressing component is smoother during operation, and the reset and subsequent secondary pressing are more accurate.

[0018] Furthermore, the fourth roller seat and the fifth roller seat have the same number of helical teeth, and the same number of graphics (including patterns, texts, or combinations of operations, etc.) or numbers arranged circumferentially on the outer sides of the roller seats, and each time the pressing assembly is pressed, the graphics or numbers that are driven to rotate circumferentially on the second roller seat and the third roller seat are aligned axially with the graphics or numbers on the first roller seat; by adopting the above structure, it can be ensured that the content of the graphics or numbers on the second and third roller seats is converted once by pressing once, so that the combined content formed on the three roller seats as a whole can be replaced to avoid single content.

[0019] Furthermore, the number of bevel teeth of the fourth roller seat and the fifth roller seat is an odd number; that is, the group of content to be printed engraved in the circumferential direction of the printing core of the present application is equal to the number of bevel teeth, and both are odd numbers. The setting of odd numbers can prevent the results that some formula combinations will never appear in even grids, thereby increasing the number of variable contents printed on the printing core.

[0020] Furthermore, the outer walls of the first roller seat, the second roller seat and the third roller seat are respectively provided with a first printing pad, a second printing pad and a third printing pad, and the first printing pad, the second printing pad and the third printing pad are all provided with graphics or numbers to be printed, and the first printing pad, the second printing pad and the third printing pad are used to absorb printing ink; by adopting the above structure, sufficient printing ink can be stored in the printing pad to ensure clear printing, and printing can be performed repeatedly.

[0021] Furthermore, both ends of the third protrusion in the axial direction are provided with inclined surfaces; by adopting the above structure, through the setting of the inclined surfaces, the third protrusion can be more easily guided along the inclined surfaces during the sliding cooperation process with the second sliding groove, and is not easy to get stuck.

[0022] Furthermore, the outer diameter of the first protrusion is adapted to the inner diameter of the first slide groove, and the outer diameter of the second protrusion is adapted to the inner diameter of the second slide groove; with the above structure, the protrusion can slide in and out smoothly when entering the corresponding slide groove, and there will not be a large gap between the two when they cooperate, so as to ensure that the position is accurately aligned when the protrusion presses the next bevel tooth surface again.

[0023] The present application also provides a three-roller seal, which contains the three-roller ink core structure mentioned above in the present application. During the printing process, the seal with the ink core structure can change the printing content by pressing, and can realize relative circumferential rotation of two of the rollers, thereby providing more types of printing content.

[0024] Furthermore, the three-roller seal described in the present application includes a first shell and a second shell, the first shell is rotatably connected to the three-roller ink core, the lower part of the three-roller ink core protrudes from the first shell, and the second shell is snapped on the first shell and encapsulates the protruding part of the three-roller ink core; with the above structure, the ink core is rotatably connected to the above shell through the first shell, and the rolling operation of the working process is realized through its protruding part. When not in use, the second shell is snapped on to realize the encapsulation of the entire ink core, which plays a protective role and prevents ink contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the printing core of this application.

[0026] Figure 2 A schematic diagram of the structure of the cross-sectional view of the printing core of this application.

[0027] Figure 3 A schematic structural diagram of a cross-sectional view of the printing core of the present application (the pressing shaft is not shown).

[0028] Figure 4 Schematic diagram of the structure of the printing core without printing pad in this application.

[0029] Figure 5 Above Figure 4 Schematic diagram of the structure of the cross-sectional view (pressing shaft and button are not shown).

[0030] Figure 6 Above Figure 4 Structural schematic diagram of the cross-sectional view (the fourth roller seat, the fifth roller seat and the button are not shown)

[0031] Figure 7 Schematic diagram of the structure of the pressing shaft of this application.

[0032] Figure 8 A schematic structural diagram of the fourth roller seat of the present application.

[0033] Fig. 9 A schematic structural diagram of the fifth roller seat of the present application.

[0034] Fig.10 Schematic diagram of the structure of the pressing component of this application.

[0035] Fig.11 A schematic diagram of the structure of the protrusion of the present application in contact and abutment with the helical teeth.

[0036] Fig.12 A schematic structural diagram of the first roller seat of the present application.

[0037] Fig.13 A schematic structural diagram of the second roller seat of the present application.

[0038] Fig.14 A schematic structural diagram of the third roller seat of the present application.

[0039] Fig.15 A schematic structural diagram of a side sectional view of the printing core shaft of the present application.

[0040] Fig.16 A schematic structural diagram of a side sectional view of the printing core shaft of the present application (without a pressing shaft).

[0041] Fig.17 Schematic diagram of the structure of the three-roller seal of this application when not in use.

[0042] Fig.18 Schematic diagram of the structure of the three-roller seal of this application when in use.

[0043] Fig.19 A structural schematic diagram of the assembly diagram of the three-roller seal of the present application.

[0044] As shown in the accompanying drawings: a. pressing assembly, 1. first roller seat, 2. second roller seat, 21. fourth slide groove, 3. third roller seat, 31. fifth slide groove, 4. button, 5. pressing shaft, 51. first protrusion, 52. second protrusion, 53. third protrusion, 6. fourth roller seat, 61. first oblique tooth, 62. fourth protrusion, 7. fifth roller seat, 71. second oblique tooth, 72. fifth protrusion, 8. elastic member, 9. first slide groove, 10. second slide groove, 11. third slide groove, 12. first printing pad, 13. second printing pad, 14. third printing pad, 15. first shell, 16. second shell. DETAILED DESCRIPTION

[0045] The following will combine the embodiments and drawings to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only preferred embodiments, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention;

[0046] It should also be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be another intermediate component, fixed through the intermediate component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] As attached Figure 1-6 As shown in 10-11, a three-roller printing core of the present application comprises a first roller seat 1, a second roller seat 2 and a third roller seat 3, wherein the first roller seat 1, the second roller seat 2 and the third roller seat 3 are coaxially arranged side by side (specifically, as shown in the direction of the accompanying drawing, from left to right they are the first roller seat, the second roller seat and the third roller seat, and the content to be printed is distributed on the outer sides of the three roller seats, which cooperate axially with each other to form a complete printing content); a pressing assembly a is arranged in the first roller seat 1, the second roller seat 2 and the third roller seat 3, and the pressing assembly a is used to drive the second roller seat 2 and the third roller seat 3 to rotate circumferentially relative to the first roller seat 1, and at the same time can drive the second roller seat 2 and the third roller seat 3 to rotate circumferentially relative to each other (that is, the second roller seat and the third roller seat rotate circumferentially one counterclockwise and one clockwise under the drive of the pressing assembly).

[0048] By adopting the above structure, the present application sets a pressing component in the three-roller printing core, and by pressing the component, the second roller seat and the third roller seat can be made to rotate circumferentially relative to the first roller seat, thereby realizing the change of the graphic content on the three roller seats, so that the content of the three roller seats set relatively to each other changes, and each pressing can achieve a content change, thereby realizing the conversion of content. Unlike the traditional double-roller seal structure, which is limited to the amount of circumferentially printed content, the present application can change once by pressing once, which effectively improves the diversity of content. In addition, the present application sets three coaxially arranged rollers. The second roller seat and the third roller seat can rotate circumferentially relative to each other and can also rotate circumferentially relative to the first roller seat. Therefore, the contents to be printed distributed outside the three roller seats can be replaced with each other in more ways. Compared with the structure of two rollers, the types of change arrangements and combinations are more diverse, so the printable contents can be further enriched. In addition, the three-roller printing core of the present application can achieve the above-mentioned specific rotation method by pressing the assembly. Compared with the existing structure of the spring sheet and the groove clamping force, the circumferential relative rotation force is lighter and more labor-saving, more suitable for children to operate, and easier and faster to operate.

[0049] As attached Figure 2-3 As shown in 5-6, the first roller seat 1, the second roller seat 2 and the third roller seat 3 described in the present application form an accommodating space (axially hollow inner cavity) along the axial direction, and the pressing assembly a includes a button 4 located at the outer end of the third roller seat 3 and a pressing shaft 5 located in the accommodating space; a fourth roller seat 6 is arranged between the second roller seat 2 and the pressing shaft 5, a fifth roller seat 7 is arranged between the third roller seat 3 and the pressing shaft 5, and an elastic member 8 is arranged between the pressing shaft 5 and the first roller seat 1; the button 4 abuts against the pressing shaft 5 and can drive the pressing shaft 5 to move axially, and the pressing shaft 5 drives the fourth roller seat 6 to drive the second roller seat 2 (the two are synchronized in the circumferential direction) and the third roller seat 1 in the axial movement process. The fifth roller seat 7 drives the third roller seat 3 to rotate circumferentially (the two are synchronized circumferentially), and the fourth roller seat 6 and the fifth roller seat 7 rotate circumferentially in the opposite direction; the above-mentioned structure of the present application can realize the forward and backward movement of the pressing shaft in the axial direction by pressing the button with external force, and realize the resetting of the pressing shaft in the absence of pressing force in combination with the elastic member. This process realizes the circumferential rotation of the fourth roller seat and the fifth roller seat, as well as the reverse rotation between the two, so that the second roller seat and the third roller seat can rotate circumferentially relative to the first roller seat, and the second roller seat and the third roller seat can rotate in the opposite direction at the same time, so that two of the three rollers can rotate at the same time, so that the types of changes in the content to be printed engraved on the outer sides of the three rollers are more, providing more diverse printing effects.

[0050] As attached Figure 2-3As shown in 5-6, the outer wall of the pressing shaft 5 described in the present application is provided with a first protrusion 51 and a second protrusion 52, the first protrusion 51 is located at the connection between the second roller seat 2 and the fifth roller seat 7, and the second protrusion 52 is close to the button 4 end; the front end of the fourth roller seat 6 (close to the first protrusion end) is provided with a first oblique tooth 61, the front end of the fifth roller seat 7 (close to the second protrusion end) is provided with a second oblique tooth 71, the inner wall of the connecting end of the second roller seat 2 and the fifth roller seat 7 is provided with a first slide groove 9 for the first protrusion 51 to slide into, and the inner wall of the third roller seat 3 is provided with a second slide groove 10 for the second protrusion 52 to slide into; the notch of the first slide groove 9 and the notch of the second slide groove 10 Each of them is provided with an inclined surface for the corresponding protrusion to abut and press (the inclined surface is close to the corresponding helical tooth end), the tip of the inclined surface (that is, the position of the inclined surface close to the front end of each helical tooth) is close to the side of the helical tooth surface of the corresponding helical tooth for the protrusion to abut and press (that is, the tip of the inclined surface of the slot mouth is close to the side of the helical tooth surface of the corresponding helical tooth for the protrusion to abut and press, that is, the tip of the inclined surface is misaligned with the tooth root of the helical tooth and close to the side of the helical tooth surface to be abutted and pressed by the protrusion, and at the same time, the tooth tip of the helical tooth is close to the side of the inclined surface of the slot mouth; that is, after the protrusion of the present application completes the reset of the corresponding helical tooth by pressing, it can ensure that the reverse direction and the inclined surface abutment process can enter the next slot position arranged circumferentially in the same group of slots along the guidance of the inclined surface, so as to smoothly carry out the subsequent driving action), the first helical tooth 61 and The second bevel teeth 71 are respectively used to be inclined in the opposite direction to the bevel tooth surfaces pressed against by the first protrusion 51 and the second protrusion 52 (that is, the first bevel teeth and the second bevel teeth are respectively used to be inclined in the opposite direction to the bevel tooth surfaces pressed against by the corresponding protrusions. For example, if the bevel tooth surface of the first bevel tooth used for the protrusion to abut is inclined to the left, then the bevel tooth surface of the corresponding second bevel tooth is inclined to the right). With the above structure, the present application moves the pressing axis toward the first roller seat by pressing the button. At this time, the first protrusion thereon will approach the bevel teeth of the fourth roller seat along the first slide groove and gradually approach the bevel tooth surface of the bevel teeth. Similarly, the second protrusion will also approach the bevel teeth of the fifth roller seat along the second slide groove and gradually approach the bevel tooth surface of the bevel teeth. If the pressing is continued, the first protrusion and the second protrusion will move along the corresponding The bevel tooth surface of the bevel tooth gradually reaches the tooth root of the bevel tooth. In this process, the fourth roller seat rotates circumferentially under the axial pressing force of the first protrusion and the tooth surface of the bevel tooth, and drives the second roller seat to rotate circumferentially at the same time. Similarly, the fifth roller seat rotates circumferentially under the axial pressing force of the second protrusion and the tooth surface of the bevel tooth, and drives the third roller seat to rotate circumferentially at the same time. Moreover, since the first bevel tooth and the second bevel tooth are used to press and abut against the bevel tooth surface of the first protrusion and the second protrusion in opposite directions, the fourth roller seat and the fifth roller seat are pressed and rotated circumferentially by the first protrusion and the second protrusion respectively, which will inevitably cause the two to rotate circumferentially in opposite directions. The above rotation realizes the change of the content to be printed engraved on the outside of the second roller seat and the third roller seat.Moreover, the inclined surface of the slideway is aligned with the tooth root of the helical tooth, that is, the axially aligned position of the tooth root of the helical tooth falls within the inclined surface range of the slideway, which can guide the protrusion to effectively reset to achieve subsequent circumferential drive. ;

[0051] As attached Figure 10-11 As shown, the first protrusion 51 and the second protrusion 52 described in the present application are both cylindrical and extend radially outward along the outer side wall of the pressing shaft, and the axis of the cylindrical first protrusion 51 and the second protrusion 52 (the axis of the cylinder) is misaligned with the tooth tip of the corresponding helical tooth (the first helical tooth and the second helical tooth) (that is, the axis of the cylinder and the axial direction of the tooth tip of the helical tooth are not in a straight line, which can be seen in detail Fig.11 The abutting state is very obvious, and the cylindrical protrusion is more inclined to the side of the bevel tooth surface on the pressing side where it needs to abut); with the above structure, the cylindrical protrusion is smoother in the process of pressing the tooth surface of the bevel tooth of the roller seat, and is not easy to get stuck; and the axis of the protrusion is misaligned with the tooth tip of the bevel tooth, which can ensure that the protrusion is easier to maintain alignment with the tooth surface of the bevel tooth to be pressed during the pressing process, thereby achieving precise pressing, and the second and subsequent pressing after resetting can also achieve accurate circumferential drive of the corresponding roller seat.

[0052] As attached Figure 10-11 As shown, the inclined surfaces on both sides of the tooth tips of the first beveled tooth 61 and the second beveled tooth 71 described in the present application are both a small beveled surface on one side and a large beveled surface on the other side (the small beveled surface and the large beveled surface face the middle bulge to form a complete beveled tooth, the inclination angle of the small beveled surface is steeper and the extended length of the beveled surface is short, the inclination angle of the large beveled surface is gentler and the extended length of the beveled surface is relatively longer), the first protrusion 51 and the second protrusion 52 are used to press against the large beveled surface, and the inclination directions of the large beveled surfaces of the first beveled tooth 61 and the second beveled tooth 71 are opposite (that is, the inclination directions of the two beveled surfaces are opposite to each other, and the cylindrical first protrusion and the second protrusion The axis of the roller seat is located on the large inclined surface side along the axial direction of the roller seat); with the above structure, the abutment and pressing on the large inclined surface can make the fourth and fifth roller seats have a sufficient circumferential rotation angle, and the provision of the large inclined surface and the small inclined surface can also make it easier for the protrusions to always drive the corresponding roller seats to rotate circumferentially in the same direction, that is, the roller seat driven by the first protrusion is always in the opposite direction of the circumferential rotation of the roller seat driven by the second protrusion; in addition, the axes of the cylindrical first protrusion and the second protrusion are located on the large inclined surface side along the axial direction of the roller seat, so that the protrusions can always be pressed against the large tooth surfaces of the corresponding helical teeth when they are reset for the second time.

[0053] As attached Figure 3 , 5 As shown, the inclined direction of the inclined tooth surface of the first beveled tooth 61 for the first protrusion 51 to press against is opposite to the inclined direction of the notch inclined surface of the first slide groove 9, and the inclined direction of the inclined tooth surface of the second beveled tooth 71 for the second protrusion 52 to press against is opposite to the inclined direction of the notch inclined surface of the second slide groove 10 (as an example, as shown in the attached Figure 3 , 5 As shown, when the protrusion is pressed against the large inclined surface, the inclination direction of the large inclined surface is opposite to the inclination direction of the inclined surface of the corresponding slide groove); with the above structure, when the protrusion presses the corresponding beveled tooth surface to the tooth root position and then resets, it will gradually approach the inclined surface corresponding to the slide groove slot until it is pressed against. The above-mentioned setting of the beveled tooth surface for the protrusion to press against and the inclined surface of the slot in opposite directions can make the protrusion press the beveled tooth surface or the inclined surface of the slot, so that the circumferential rotation direction of the driven roller seat is consistent, and can also guide the protrusion to enter the next circumferentially distributed slide groove arranged in sequence (that is, the next circumferential slide groove that rotates in sequence, and will not turn back to the starting slide groove before the circumferential rotation), to ensure the accuracy of the second press; this is because after the button has no pressing force, the protrusion will drive the roller seat where the slide groove is located to rotate circumferentially again under the guidance of the inclined surface of the slide groove during the reset process driven by the elastic member, and the setting of the above structure ensures that the circumferential rotation of the corresponding driven roller seat of each protrusion during the pressing and resetting process is in the same direction.

[0054] As attached Figure 2 , 7 , as shown in 10-11, a third protrusion 53 is further provided on the side wall of the pressing shaft 5 described in the present application, and the third protrusion 53 is located at the connection between the first roller seat 1 and the fourth roller seat 6 (the position of the protrusion after the button has no pressing force and the elastic member is naturally reset), and a third slide groove 11 for the third protrusion 53 to slide into is provided on the inner wall of the connection end of the first roller seat 1 and the fourth roller seat 6; when the button 4 applies pressing force, the third protrusion 53 gradually moves away from the third slide groove 11 at the end of the fourth roller seat 6 and finally disengages from it (after disengagement, the fourth roller seat is not limited and can rotate circumferentially); adopting The above-mentioned structure, the present application can realize that during the pressing and resetting process of the elastic member, the pressing shaft only moves axially without circumferential rotation under the limitation of the third protrusion and the third slide groove, and only the third roller seat and the second roller seat rotate circumferentially; and when the elastic member is in a resetting state without the action of pressing force, the second roller seat and the first roller seat are circumferentially positioned relative to each other, and after the first protrusion is reset, the second roller seat and the third roller seat can also be circumferentially positioned, so that the three roller seats of the first, second and third roller seats maintain circumferential synchronization during the printing rolling process, and the printed content will not be skewed, and the printing is more neat.

[0055] As attached Figure 2-3As shown in 5-6, the axial length of the third slide groove 11 on the inner wall of the first roller seat 1 described in the present application is adapted to the axial compression distance of the elastic member 8 (i.e., the extension length of the third slide groove on the first roller seat side is sufficient for the length of the axial displacement required by the third protrusion, and the slide groove and the protrusion can also ensure that the pressing shaft does not rotate circumferentially relative to the first roller seat when they cooperate); by adopting the above structure, after the third protrusion is separated from the fourth roller seat, it can always be in the third slide groove on the inner wall of the first roller seat, thereby realizing the circumferential limiting effect of the third protrusion on the pressing shaft, ensuring that the pressing shaft only moves axially forward and backward during the pressing and resetting process, and does not rotate circumferentially to affect the accurate resetting of the protrusion thereon.

[0056] As attached Figure 6 , as shown in 10-11 and 13-14, the outer wall of the fourth roller seat 6 described in the present application is provided with a fourth protrusion 62, and the corresponding second roller seat 2 is provided with a fourth slide groove 21 that is plugged and matched therewith; the outer wall of the fifth roller seat 7 is provided with a fifth protrusion 72, and the corresponding third roller seat 3 is provided with a fifth slide groove 31 that is plugged and matched therewith; the above structure is adopted to realize the circumferential limiting connection between the fourth roller seat and the second roller seat, and the circumferential limiting connection between the fifth roller seat and the third roller seat, and when the pressing component drives the fourth roller seat and the fifth roller seat to rotate circumferentially, the second roller seat and the third roller seat can be driven to rotate circumferentially synchronously at the same time.

[0057] As attached Figure 7 As shown in 10-11, the first protrusion 51, the second protrusion 52 and the third protrusion 53 described in the present application are located on the same straight line along the axial direction, and the outer diameter of the outer wall where the second protrusion 52 of the pressing shaft 5 is located is larger than the outer diameter of the outer wall where the first protrusion 51 is located, and the outer diameter of the outer wall where the first protrusion 51 is located is larger than the outer diameter of the outer wall where the third protrusion 53 is located; adopting the above structure, during the operation of the pressing component, it is ensured that when the fifth roller seat is driven circumferentially by the second protrusion and the fourth roller seat is driven circumferentially by the first protrusion, each protrusion slides synchronously in the same axial line in the corresponding slide groove, making the operation smoother; in addition, the unequal diameter setting of the pressing shaft can not only effectively save materials, but also save space and make the overall structure more compact.

[0058] As attached Figure 3 , 5 As shown in FIG. 16 , the first slide groove 9, the second slide groove 10 and the third slide groove 11 described in the present application are aligned along the axial direction (that is, the three slide grooves are opened on the same straight line along the axial direction of the pressing shaft, as shown in FIG. Fig.16 As shown, the three slide grooves are arranged concentrically along the radial direction); with this structure, the pressing component is smoother during operation, and the reset and subsequent secondary pressing are more accurate.

[0059] As an example, the fourth roller seat 6 and the fifth roller seat 7 described in the present application have the same number of helical teeth, and the number of helical teeth is equal to the number of graphics (including patterns, texts, or operations, etc.) or numbers arranged circumferentially on the outer side of the roller seat. Each time the pressing component a is pressed, the graphics or numbers positioned circumferentially by the second roller seat 2 and the third roller seat 3 are driven to align axially with the graphics or numbers on the first roller seat 1. By adopting the above structure, it can be ensured that the content of the graphics or numbers of the second and third roller seats is converted once by pressing once, so that the combined content formed on the three roller seats as a whole is replaced to avoid single content.

[0060] As an example, the number of bevel teeth on the fourth roller seat and the fifth roller seat described in the present application is an odd number, and the corresponding content group to be printed on the outer sides of the first roller seat, the second roller seat and the third roller seat is equal to the number of bevel teeth; with the above structure, the button can be pressed once, and the corresponding circumferential direction of the roller seat will rotate by a certain angle, and the rotation angle ensures that the printed content on the outer side of the roller seat rotates accordingly, and after the rotation is completed and reset, the axial direction of the content to be printed on the roller is still aligned; and the setting of an odd number can prevent the results that some formula combinations will never appear in even number grids, thereby increasing the number of changeable contents printed on the printing core.

[0061] As attached Figure 1-3 As shown, the outer walls of the first roller seat 1, the second roller seat 2 and the third roller seat 3 described in the present application are respectively provided with a first printing pad 12, a second printing pad 13 and a third printing pad 14, and the first printing pad 12, the second printing pad 13 and the third printing pad 14 are all provided with graphics or numbers to be printed, and the first printing pad 12, the second printing pad 13 and the third printing pad 14 are used for absorbing printing ink; by adopting the above structure, sufficient printing ink can be stored in the printing pad to ensure clear printing, and printing can be repeated multiple times; the printing pad can be a material that can absorb ink and will not cause ink smudging.

[0062] As attached Figure 7 As shown, both ends of the third protrusion 53 in the axial direction described in the present application are provided with inclined surfaces; by adopting the above structure, through the setting of the inclined surfaces, the third protrusion can be more easily guided into the second slide groove during the sliding cooperation process, and it is not easy to get stuck.

[0063] As attached Fig.16 As shown, the outer diameter of the first protrusion 51 described in the present application is adapted to the inner diameter of the first slide groove 9, and the outer diameter of the second protrusion 52 is adapted to the inner diameter of the second slide groove 10; with the above structure, the protrusion can slide in and out smoothly when entering the corresponding slide groove, and there will not be a large gap between the two when they cooperate, so as to ensure that the position is accurately aligned when the protrusion presses the next bevel tooth surface again.

[0064] As attached Figure 17-19 As shown, the present application also provides a three-roller seal, which contains the three-roller ink core structure mentioned above in the present application. During the printing process, the seal with the ink core structure can replace the printed content by pressing, and can realize relative circumferential rotation of two of the rollers, thereby providing more types of printed content.

[0065] As attached Figure 17-19 As shown, the three-roller seal described in the present application includes a first shell 15 and a second shell 16, the first shell 15 is rotatably connected to the three-roller ink core (that is, both ends of the three-roller ink core are rotatably connected to the first shell, and the button end protrudes from the shell for easy pressing, and a circumferential convex ring is provided on the button for abutting against the inside of the shell to ensure that the button is accurately reset and does not separate from the shell), the lower part and part of the three-roller ink core protrude from the first shell 15, and the second shell 16 is buckled on the first shell 15 and encapsulates the protruding part of the three-roller ink core (the ink core is encapsulated in the shell when not in use to prevent the ink from volatilizing quickly and also to prevent pollution); with the above structure, the ink core is rotatably connected to the above shell through the first shell, and the rolling operation of the working process is realized through its protruding part, and when not in use, the second shell is buckled to realize the encapsulation of the entire ink core, which plays a protective role and prevents ink pollution.

[0066] The present application provides a plurality of helical teeth along the circumferential direction, and each corresponding group of slide grooves is also provided with a plurality of helical teeth along the circumferential direction of the inner wall of the respective component, so as to facilitate the pressing and rotating process, each pressing can make the protrusion sequentially enter the next slide groove position of the same group of slide grooves and correspond to the next helical tooth; the present application achieves a circumferential rotation angle of the roller seat by pressing once so that the axial direction of the content to be printed on the three rollers remains aligned after rotation, so as to ensure the regularity and non-skewness of the printing.

[0067] The spacing between the first beveled tooth and the first slide groove of the present application is greater than the outer diameter of the first protrusion, and the spacing between the second beveled tooth and the second slide groove is greater than the outer diameter of the second protrusion, thereby giving the protrusion sufficient space to press the beveled tooth and the inclined surface of the slide groove to achieve circumferential driving action on the roller seat.

[0068] The specific working principle and process of the seal of this application are as follows: Figure 1 Taking the printed content of mathematical operators as an example, the first printing pad is provided with 11 groups of numbers engraved in a circumferential direction, the second printing pad is provided with 11 groups of operation symbols such as "+", "-", "×" and "÷", and the third printing pad is engraved with 11 groups of numbers and the "=" symbol; according to Fig.18The assembly diagram assembles the various parts to form a complete assembly, wherein the first roller seat, the second roller seat and the third roller seat are arranged in sequence in the same axial direction, and the pressing assembly is located in the axial accommodation space formed by the above three roller seats; a through hole for the button to extend out of the shell is provided on one lateral side of the first shell, so that the button can be conveniently extended out of the shell for pressing, and a radial flange is provided at the inner end of the button to abut against the outer wall of the through hole of the first shell to prevent the button from detaching from the shell; during installation, the printing core is installed in the first shell as a whole by pressing the compression elastic member, and the outer wall of the first shell is blocked during the subsequent pressing and use process, which will not cause the button to be over-pressed and completely sink into the first shell; the first shell The width is adapted to the axial length of the printing core to ensure that the printing core can work normally; the left end face of the fourth roller seat abuts against the inner end of the first roller seat, the right end face of the second roller seat abuts against the inner end of the fifth roller seat, and the button abuts against the right end face of the pressing shaft; when it is necessary to print operators on paper, remove the second shell (the first shell and the second shell can be connected in a conventional snap-on manner, which is convenient for disassembly and assembly), hold the first shell and roll it on the paper, and the three-roller printing core rotates circumferentially in the first shell to achieve printing. In this process, the three roller seats are circumferentially limited by the first protrusion, the third protrusion, the fourth protrusion and the fifth protrusion, and the printed content outside the roller seat can be coaxially and synchronously rotated circumferentially;When the style of the printed content needs to be adjusted, the button is pressed, and the button pushes the pressing shaft toward the elastic member (a straight spring structure can be adopted, one end of which abuts against the bottom wall of the inner groove axially extending inside the first roller seat, and the other end is sleeved on the pressing shaft) and compresses the elastic member. In this process, the first protrusion and the second protrusion also approach the corresponding fourth roller seat and the fifth roller seat along the pressing shaft, and the third protrusion gradually disengages from the third slide groove at the end of the fourth roller seat. When the first protrusion and the second protrusion respectively contact and abut against the corresponding bevel tooth surfaces of the first bevel tooth and the second bevel tooth, the third protrusion is continued to be pressed. The first protrusion is disengaged from the limit on the fourth roller seat end, and the first protrusion is disengaged from the limit on the fifth roller seat. The pressing shaft is circumferentially limited in the third slide groove at the first roller seat end where the third protrusion is located. Under the guidance of the bevel tooth surface, the fourth roller seat drives the second roller seat, and the fifth roller seat drives the third roller seat to realize reverse circumferential rotation until the protrusions are pressed to the root position of the corresponding bevel teeth and cannot be pressed any further. At this time, the button is released, and the pressing shaft is pushed and reset under the action of the restoring force of the elastic member. In this process, the first protrusion, the second protrusion and the third protrusion are reset in the opposite direction, and the first protrusion and The inclined surface of the first slide groove notch abuts, the second protrusion abuts against the inclined surface of the second slide groove notch, and the third protrusion also enters the third slide groove at the end of the fourth roller seat. Under the guidance of the inclined surface of the notch, the first protrusion enters the next slide groove position arranged circumferentially in the first slide groove, and the second protrusion enters the next slide groove position arranged circumferentially in the second slide groove. The above process drives the second roller seat and the third roller seat to rotate circumferentially until the reset is completed to realize the positioning of the second roller seat and the third roller seat after the circumferential rotation. At this time, the mathematical operators outside the three roller seats after the rotation are updated , a new operator combination appears, press the ink core again to roll and print on the paper; the seal of this application only needs to press the button to change the combination under the action of pressing force, and the adjustment is more convenient and labor-saving; the three rollers of this application rotate synchronously in the circumferential direction during the rolling use process, and the process of the protrusion and the inclined surface of the bevel gear against each other does not need to overcome the deformation force and will not cause wear, ensuring that the printed content is not easy to be distorted and the imprint is neat; compared with the two-roller seal, the three-roller seal of this application has an additional roller that can rotate in the circumferential direction, so that the types of combinations of the content to be printed are more and richer. ;

Claims

1. A three-roller printing core, characterized in that: The structure of the three-roller printing core comprises a first roller seat (1), a second roller seat (2) and a third roller seat (3), wherein the first roller seat (1), the second roller seat (2) and the third roller seat (3) are coaxially arranged side by side; a pressing assembly (a) is arranged inside the first roller seat (1), the second roller seat (2) and the third roller seat (3), and the pressing assembly (a) is used to drive the second roller seat (2) and the third roller seat (3) to rotate circumferentially relative to the first roller seat (1), and simultaneously drive the second roller seat (2) and the third roller seat (3) to rotate circumferentially relative to each other.

2. The three-roller printing core according to claim 1, characterized in that: The first roller seat (1), the second roller seat (2) and the third roller seat (3) are provided with an accommodating space along the axial direction; the pressing assembly (a) comprises a button (4) at the outer end of the third roller seat (3) and a pressing shaft (5) located in the accommodating space; a fourth roller seat (6) is arranged between the second roller seat (2) and the pressing shaft (5); a fifth roller seat (7) is arranged between the third roller seat (3) and the pressing shaft (5); an elastic member (8) is arranged between the pressing shaft (5) and the first roller seat (1); the button (4) abuts against the pressing shaft (5) and can drive the pressing shaft (5) to move along the axial direction; during the axial movement of the pressing shaft (5), the fourth roller seat (6) drives the second roller seat (2) and the fifth roller seat (7) drives the third roller seat (3) to rotate in the circumferential direction, and the fourth roller seat (6) and the fifth roller seat (7) rotate in opposite directions in the circumferential direction.

3. The three-roller printing core according to claim 2, characterized in that: The outer wall of the pressing shaft (5) is provided with a first protrusion (51) and a second protrusion (52), wherein the first protrusion (51) is located at the connection between the second roller seat (2) and the fifth roller seat (7), and the second protrusion (52) is close to the button (4) end; the front end of the fourth roller seat (6) is provided with a first oblique tooth (61), the front end of the fifth roller seat (7) is provided with a second oblique tooth (71), and the inner wall of the connection end between the second roller seat (2) and the fifth roller seat (7) is provided with a tooth for the first protrusion (51) to slide The third roller seat (3) is provided with a first slide groove (9) for the second protrusion (52) to slide into, and the inner wall of the third roller seat (3) is provided with a second slide groove (10) for the second protrusion (52) to slide into; the notch of the first slide groove (9) and the notch of the second slide groove (10) are both provided with an inclined surface () for the corresponding protrusion to press against, and the tip of the inclined surface () is close to the side of the inclined tooth surface of the corresponding bevel tooth for the protrusion to press against; the first bevel tooth (61) and the second bevel tooth (71) are respectively used to have an inclination direction opposite to the inclined tooth surface pressed against by the first protrusion (51) and the second protrusion (52).

4. The three-roller printing core according to claim 3, characterized in that: The first protrusion (51) and the second protrusion (52) are both cylindrical and extend radially outward along the outer wall of the pressing shaft, and the axes of the cylindrical first protrusion (51) and the second protrusion (52) are offset from the tooth tips of the corresponding helical teeth.

5. The three-roller printing core according to claim 3, characterized in that: The inclined surfaces on both sides of the tooth tips of the first oblique tooth (61) and the second oblique tooth (71) are both small inclined surfaces on one side and large inclined surfaces on the other side, the first protrusion (51) and the second protrusion (52) are used to press against the large inclined surfaces, and the inclination directions of the large inclined surfaces of the first oblique tooth (61) and the second oblique tooth (71) are opposite.

6. The three-roller printing core according to claim 3, characterized in that: The inclined direction of the inclined tooth surface of the first oblique tooth (61) for the first protrusion (51) to press against is opposite to the inclined direction of the inclined surface of the slot opening of the first slide groove (9), and the inclined direction of the inclined tooth surface of the second oblique tooth (71) for the second protrusion (52) to press against is opposite to the inclined direction of the inclined surface of the slot opening of the second slide groove (10).

7. The three-roller printing core according to claim 3, characterized in that: A third protrusion (53) is also provided on the side wall of the pressing shaft (5), and the third protrusion (53) is located at the connection between the first roller seat (1) and the fourth roller seat (6). A third slide groove (11) for the third protrusion to slide into is provided on the inner wall of the connection end of the first roller seat (1) and the fourth roller seat (6); when the button (4) applies pressing force, the third protrusion (53) gradually moves away from the third slide groove (11) at the end of the fourth roller seat (6) and finally disengages from it.

8. The three-roller printing core according to claim 7, characterized in that: The axial length of the third sliding groove (11) on the inner wall of the first roller seat (1) is adapted to the axial compression distance of the elastic member (8).

9. The three-roller printing core according to claim 2, characterized in that: The outer wall of the fourth roller seat (6) is provided with a fourth protrusion (62), and the corresponding second roller seat (2) is provided with a fourth slide groove (21) plug-fitting therewith; the outer wall of the fifth roller seat (7) is provided with a fifth protrusion (72), and the corresponding third roller seat (3) is provided with a fifth slide groove (31) plug-fitting therewith.

10. The three-roller printing core according to claim 7, characterized in that: The first protrusion (51), the second protrusion (52) and the third protrusion (53) are located on the same straight line along the axial direction, and the outer diameter of the outer wall where the second protrusion of the pressing shaft (5) is located is larger than the outer diameter of the outer wall where the first protrusion (51) is located, and the outer diameter of the outer wall where the first protrusion (51) is located is larger than the outer diameter of the outer wall where the third protrusion (53) is located.

11. The three-roller printing core according to claim 7, characterized in that: The first sliding groove (9), the second sliding groove (10) and the third sliding groove (11) are arranged in alignment along the axial direction.

12. The three-roller printing core according to claim 2, characterized in that: The fourth roller seat (6) and the fifth roller seat (7) have the same number of helical teeth, and the number of helical teeth is equal to the number of graphics or numbers arranged circumferentially on the outer side of the roller seat; each time the pressing component (a) is pressed, the graphics or numbers driven by the second roller seat (2) and the third roller seat (3) are rotated circumferentially and positioned so that they are axially aligned with the graphics or numbers on the first roller seat (1).

13. The three-roller printing core according to claim 12, characterized in that: The number of helical teeth on the fourth roller seat (6) and the fifth roller seat (7) is an odd number.

14. The three-roller printing core according to claim 1, characterized in that: A first printing pad (12), a second printing pad (13) and a third printing pad (14) are respectively sleeved on the outer walls of the first roller seat (1), the second roller seat (2) and the third roller seat (3); graphics or numbers to be printed are arranged on the first printing pad (12), the second printing pad (13) and the third printing pad (14); and the first printing pad (12), the second printing pad (13) and the third printing pad (14) are used for absorbing printing ink.

15. The three-roller printing core according to claim 7, characterized in that: Both ends of the third protrusion (53) in the axial direction are provided with inclined surfaces.

16. The three-roller printing core according to claim 7, characterized in that: The outer diameter of the first protrusion (51) is matched with the inner diameter of the first sliding groove (9), and the outer diameter of the second protrusion (52) is matched with the inner diameter of the second sliding groove (10).

17. A three-roller stamp, characterized in that: The seal comprises the three-roller seal core as described in any one of claims 1 to 16.

18. The three-roller stamp according to claim 17, characterized in that: The seal comprises a first shell (15) and a second shell (16), wherein the first shell (15) is rotatably connected to a three-roller ink core, the lower portion of the three-roller ink core protrudes from the first shell (15), and the second shell (16) is buckled onto the first shell (15) and seals the protruding portion of the three-roller ink core.

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