An adjustable roller stamp

Abstract

The application discloses an adjustable roller type seal, which comprises a shell, a roller assembly and a seal cover; one end of the shell is provided with an opening, and the roller assembly is installed on the end provided with the opening; the roller assembly comprises a large roller, a small roller and a synchronizing part; the outer diameter of the large roller is larger than that of the small roller, and the number of digits on the large roller is more than that on the small roller; the large roller and the small roller are both rotationally connected to the shell; the synchronizing part can drive the large roller and the small roller to rotate synchronously; one side of the large roller and one side of the small roller are both exposed outside the shell, and the one side of the large roller and the one side of the small roller are on the same horizontal line; the large roller and / or the small roller are slidingly matched with the shell, and a clutch structure is arranged between the large roller and / or the small roller and the synchronizing part. In the process of using the adjustable roller type seal, the automatic replacement of the digit combination can be realized without rotating the rollers on two sides, the user can use conveniently, and the use experience of the product is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of seal technology, and more specifically to an adjustable roller seal. Background Technology

[0002] In arithmetic instruction, teachers need to create problems based on arithmetic operations for students' practice after class. However, with current technology, teachers often have to create these problems themselves, which is cumbersome and time-consuming. Furthermore, copying is prone to occur when students solve the same arithmetic problems. Adjustable roller stamps, by using a rolling mechanism, can quickly print mathematical formulas, numbers, or other graphics on paper, effectively solving these problems.

[0003] The invention disclosed in CN216993646U is a coaxial double-roller stamp, including a shell and a stamp cover, which are movably engaged. The roller mechanism includes a first roller stamp and a second roller stamp. The two ends of the first roller stamp are rotatably connected to one side of the inner wall of the shell and a partition, respectively. A rotating block is rotatably connected between the side of the partition away from the first roller stamp and the other side of the inner wall of the shell. By setting Arabic numerals and operation symbols on the first and second roller stamps, when the first and second roller stamps rotate, the different numbers on the two sets of Arabic numerals correspond to the operation rules to form arithmetic problems, making it convenient for teachers to create problems. During use, the numbers on the first and second roller stamps can be swapped using a first and a second rotation adjustment knob, ensuring that the numbers are different so that different students can solve different problems and preventing students from referring to each other's work. This type of roller stamp has the following drawbacks: frequently switching the numbers on the first and second roller stamps by manually rotating the first and second rotation adjustment knobs is very troublesome, causing inconvenience to users and reducing the user experience of the product. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an adjustable roller stamp, which can automatically change the number combination without rotating the rollers on both sides during use, making it convenient for users and effectively improving the user experience of the product.

[0005] The technical solution of the present invention is to provide an adjustable roller-type stamp with the following structure: a shell, a roller assembly, and a stamp cover; one end of the shell has an opening, the roller assembly is mounted on the open end of the shell, and the stamp cover is connected to the open end of the shell and covers the roller assembly; the roller assembly includes a large roller, a small roller, and a synchronizing element, the outer diameter of the large roller is larger than the outer diameter of the small roller, and the large roller has more numbers than the small roller; both the large roller and the small roller are rotatably connected to the shell; the synchronizing element is connected between the large roller and the small roller, and the synchronizing element can drive the large roller and the small roller to rotate synchronously; one side of both the large roller and the small roller is exposed outside the shell, and one side of the large roller and one side of the small roller are on the same horizontal line; the large roller and / or the small roller are slidably engaged on the shell, and a clutch structure is provided between the large roller and / or the small roller and the synchronizing element.

[0006] With the above structure, the adjustable roller stamp of the present invention has the following advantages compared with the prior art:

[0007] Because the roller assembly of this adjustable roller stamp includes a large roller and a small roller, with the outer diameter of the large roller being larger than that of the small roller and the large roller displaying more numbers than the small roller, the large and small rollers rotate synchronously under the action of a synchronizing element. During use, the large and small rollers have the same linear velocity on the sticker surface. Therefore, automatic number combination changes can be achieved without rotating the rollers on both sides, making it convenient for users and effectively improving the user experience. Furthermore, the large roller and / or the small roller slide on the outer casing, and a clutch structure is provided between the large roller and / or the small roller and the synchronizing element. When it is necessary to quickly adjust the relationship between the numbers on the large and small rollers, the large roller and / or the small roller can be separated from the synchronizing element, and the large roller and / or the small roller can be rotated to quickly adjust their relative positions, thus meeting the need for rapid adjustment of the number relationship.

[0008] As an improvement, a central support is provided between the large roller and the small roller. This central support is mounted on the outer shell, and the synchronizing element is rotatably connected to the central support. The central support divides the inner cavity of the outer shell into a first cavity and a second cavity. The large roller is installed in the first cavity, and the small roller is installed in the second cavity. The large roller is rotatably connected between one side of the central support and the inner wall of one side of the outer shell, and the small roller is rotatably connected between the other side of the central support and the inner wall of the other side of the outer shell. The large roller is connected to one end of the synchronizing element via a first gear transmission structure, and the small roller is connected to the other end of the synchronizing element via a second gear transmission structure. With this structure, the central support, supported inside the outer shell, not only serves to install the large and small rollers but also reinforces the outer shell, making the structure more reliable. The transmission structure between the synchronizing element and the large roller is simple, easy to assemble, and has good transmission performance.

[0009] As an improvement, the first gear transmission structure includes a first gear ring and a first gear. The first gear ring is located on the side of the large roller near the synchronizing member, and the first gear is located on the end of the synchronizing member near the large roller. The first gear is installed inside the first gear ring and meshes with the lower side of the first gear ring. With this structure, the transmission structure between the synchronizing member and the large roller is simple, easy to assemble, and has a good transmission effect.

[0010] As an improvement, the second gear transmission structure includes a second gear ring and a second gear. The second gear ring is located on the side of the small roller near the synchronizing member, and the second gear is located on the end of the synchronizing member near the small roller. The second gear is installed inside the second gear ring and meshes with the lower side of the second gear ring. With this structure, the transmission structure between the synchronizing member and the small roller is simple, easy to assemble, and has a good transmission effect.

[0011] As an improvement, the middle part of the synchronizing element is a connecting shaft, which connects between the first gear and the second gear; the lower end of the middle bracket is provided with an embedding groove, in which the connecting shaft is embedded. With this structure, the installation of the synchronizing element and the middle bracket is simple and easy to assemble.

[0012] As an improvement, a roller bracket is provided on the open end of the outer casing. A first shaft hole is formed between one end of the roller bracket and the bottom surface of one side of the outer casing. A first roller shaft is provided on the end of the large roller near the first shaft hole, and the first roller shaft is rotatably connected within the first shaft hole. A second shaft hole is formed between the other end of the roller bracket and the bottom surface of the other side of the outer casing. A second roller shaft is provided on the end of the small roller near the second shaft hole, and the second roller shaft is rotatably connected within the second shaft hole. With this structure, the large and small rollers are installed via the roller bracket, resulting in a simple structure and convenient assembly.

[0013] As an improvement, the first cavity provides space for the large roller to slide, and the large roller slides within the first cavity. A return spring is fitted onto the shaft of the first roller, with one end abutting against the inner wall of the first cavity away from the small roller, and the other end abutting against the side wall of the large roller away from the small roller. The return spring and the shaft of the first roller form the clutch structure. With this structure, simply pulling the large roller away from the synchronizing element separates it from the synchronizing element, allowing the large roller to be rotated independently to adjust the numerical relationship between the large and small rollers. Releasing the large roller causes it to automatically engage with the synchronizing element again due to the return spring. The clutch structure is simple and effective.

[0014] As an improvement, the end of the first roller shaft furthest from the large roller is exposed outside the housing. A limiting protrusion is provided at the end of the first roller shaft, and a certain distance is maintained between the limiting protrusion and the side wall of the housing. With this structure, gripping the first roller shaft is more convenient, and the limiting protrusion effectively prevents fingers from slipping out.

[0015] As an improvement, the large roller has an annular embedding groove on its side wall away from the small roller, and the end of the return spring is embedded in the annular embedding groove. With this structure, the end of the return spring is embedded in the annular embedding groove, making the return spring installation structure more stable and reliable.

[0016] As an improvement, the large roller includes a large roller body and a large roller hub. The large roller body is fitted onto the large roller hub, and a first liquid storage chamber is provided inside the large roller hub. A first liquid outlet gap is provided on the side wall of the large roller, and the first liquid outlet gap is interconnected with the first liquid storage chamber. Liquid in the first liquid storage chamber fills the space between the large roller body and the large roller hub through the first liquid outlet gap. With this structure, the large roller is assembled from the large roller body and the large roller hub, which is simple in structure and easy to assemble.

[0017] As an improvement, the large roller hub includes a large hub body and a large hub cover. A first liquid storage tank is provided on the side of the large hub body near the large hub cover. The large hub cover is fastened into the opening of the first liquid storage tank on the large hub body, forming the first liquid storage cavity between the large hub body and the large hub cover. A gap is left at the connection between the large hub cover and the large hub body, forming the first liquid outlet gap. With this structure, the large roller hub is assembled from the large hub body and the large hub cover, with the first liquid outlet gap formed at the connection between the large hub cover and the large hub body. The structure is simple and easy to assemble.

[0018] As an improvement, the first roller shaft is located on the side of the large hub body away from the large hub cover. The first roller shaft has a hollow structure, and its inner cavity is interconnected with the inner cavity of the large hub body. A first sealing plug is used to seal the opening of the first roller shaft. The first gear ring is located on the side of the large hub cover away from the large hub body. With this structure, liquid can be added to the first liquid storage chamber by opening the first sealing plug. The structure is simple and convenient to use.

[0019] As an improvement, the large hub body has multiple first protrusions at one end near the large hub cover, and the side wall of the large hub cover has multiple first grooves that match the first protrusions. The multiple first protrusions are inserted into the multiple first grooves in a one-to-one correspondence, with a gap at the connection between the first protrusions and the first grooves forming the first liquid outlet gap. With this structure, due to the structural effect of the first protrusions and first grooves, the liquid permeating from the first liquid outlet gap fills the inner side of the large roller body more evenly, effectively improving the printing effect.

[0020] As an improvement, the small roller includes a small roller body and a small roller hub. The small roller body is fitted onto the small roller hub, and a second liquid storage chamber is provided inside the small roller hub. A second liquid outlet gap is provided on the side wall of the small roller, and the second liquid outlet gap is interconnected with the second liquid storage chamber. Liquid in the second liquid storage chamber fills the space between the small roller body and the small roller hub through the second liquid outlet gap. With this structure, the small roller is assembled from the small roller body and the small roller hub, which is simple in structure and easy to assemble.

[0021] As an improvement, the small roller hub includes a small hub body and a small hub cover. A second liquid storage tank is provided on the side of the small hub body near the small hub cover. The small hub cover is fastened into the opening of the second liquid storage tank of the small hub body, forming the second liquid storage cavity between the small hub body and the small hub cover. A gap is left at the connection between the small hub cover and the small hub body to form the second liquid outlet gap. With this structure, the small roller hub is assembled from the small hub body and the small hub cover, and the connection between the small hub cover and the small hub body forms the second liquid outlet gap. The structure is simple and easy to assemble.

[0022] As an improvement, the second roller shaft is located on the side of the small hub body away from the small hub cover. The second roller shaft has a hollow structure, and its inner cavity is interconnected with the inner cavity of the small hub body. A second sealing plug is used to seal the opening of the second roller shaft. The second gear ring is located on the side of the small hub cover away from the small hub body. With this structure, liquid can be added to the second liquid storage chamber by opening the second sealing plug. The structure is simple and convenient to use.

[0023] As an improvement, the small hub body has multiple second protrusions at one end near the small hub cover, and the side wall of the small hub cover has multiple second grooves that match the second protrusions. The multiple second protrusions are inserted into the multiple second grooves in a one-to-one correspondence, with a gap at the connection between the second protrusions and the second grooves forming the second liquid outlet gap. With this structure, due to the structural action of the second protrusions and second grooves, the liquid permeating from the second liquid outlet gap fills the inner side of the small roller body more evenly, effectively improving the printing effect. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the adjustable roller stamp of the present invention.

[0025] Figure 2 This is a partial exploded view of the adjustable roller stamp of the present invention.

[0026] Figure 3 This is an exploded view of the adjustable roller stamp of the present invention.

[0027] Figure 4 This is a three-dimensional structural diagram of the outer shell of the adjustable roller stamp of the present invention.

[0028] Figure 5 This is an exploded view of the large roller of the adjustable roller stamp of the present invention.

[0029] Figure 6This is an exploded view of the small roller of the adjustable roller stamp of the present invention.

[0030] Figure 7 This is a schematic diagram of a partial assembly structure of the adjustable roller stamp of the present invention.

[0031] The figure shows: 1. Outer shell; 102. First cavity; 103. Second cavity; 104. Limiting step; 2. Cover; 3. Central support; 302. Embedded groove; 4. Synchronizing element; 401. Connecting shaft; 402. First gear; 403. Second gear; 5. Large roller body; 6. Large roller hub; 601. Large hub body; 602. Large hub cover; 603. First liquid storage tank; 604. First protrusion; 605. First groove; 606. First liquid outlet gap; 607. First roller shaft; 608. 609. First sealing plug; 610. First gear ring; 611. Annular embedded groove; 612. Limiting protrusion ring; 7. Small roller body; 8. Small roller hub; 801. Small hub body; 802. Small hub cover; 803. Second liquid storage tank; 804. Second protrusion; 805. Second groove; 806. Second liquid outlet gap; 807. Second roller shaft; 808. Second sealing plug; 809. Second gear ring; 9. Roller bracket; 901. Support frame; 10. First shaft hole; 11. Second shaft hole; 12. Return spring. Detailed Implementation

[0032] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0033] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0034] It should also be understood that the terms “comprising,” “including,” “having,” and “containing”, when used in this specification, indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0035] like Figures 1 to 7 As shown, this application discloses an adjustable roller stamp, including a housing 1, a roller assembly and a stamp cover 2.

[0036] The outer casing 1 has an opening at one end and a closed end at the other end. The central support 3 is installed inside the outer casing 1 and is installed longitudinally. The central support 3 divides the inner cavity of the outer casing 1 into a first cavity 102 and a second cavity 103.

[0037] The roller assembly includes a large roller, a small roller, and a synchronizing element 4. The outer diameter of the large roller is larger than that of the small roller, and the large roller has more numbers than the small roller. The synchronizing element 4 is rotatably connected to the central support 3. The central support 3 is located between the large roller and the small roller.

[0038] The large roller is rotatably connected between one side of the central support 3 and the inner wall of one side of the outer shell 1, and the small roller is rotatably connected between the other side of the central support 3 and the inner wall of the other side of the outer shell 1. The large roller is connected to one end of the synchronizing member 4 via a first gear transmission structure, and the small roller is connected to the other end of the synchronizing member 4 via a second gear transmission structure. The large roller is installed at the opening of the outer shell 1 and is housed within the first cavity 102, with one side of the large roller protruding outside the outer shell 1. The small roller is installed at the opening of the outer shell 1 and is housed within the second cavity 103, with one side of the small roller protruding outside the outer shell 1. One side of the large roller and one side of the small roller are on the same horizontal line.

[0039] The large roller includes a large roller body 5 and a large roller hub 6. The large roller hub 6 includes a large hub body 601 and a large hub cover 602. A first liquid storage tank 603 is provided on the side of the large hub body 601 near the large hub cover 602. The large hub cover 602 is fastened into the opening of the first liquid storage tank 603 of the large hub body 601, forming a first liquid storage cavity between the large hub body 601 and the large hub cover 602. A plurality of first protrusions 604 are provided at one end of the large hub body 601 near the large hub cover 602. A plurality of first grooves 605 are provided on the side wall of the large hub cover 602, matching the first protrusions 604. The plurality of first protrusions 604 are inserted one-to-one into the plurality of first grooves 605. A gap is left at the connection between the first protrusions 604 and the first grooves 605 to form a first liquid outlet gap 606. The first liquid outlet gap 606 is interconnected with the first liquid storage chamber. The large roller body 5 is fitted onto the large roller hub 6. Liquid in the first liquid storage chamber fills the space between the large roller body 5 and the large roller hub 6 through the first liquid outlet gap 606. Numbers are engraved on the large roller body 5. When the large roller is rotated, liquid inside the large roller body 5 will seep out through the engraved numbers and be printed on paper.

[0040] A first roller shaft 607 is provided on the side of the large wheel hub body 601 away from the large wheel hub cover 602. The first roller shaft 607 has a hollow structure, and its inner cavity is interconnected with the inner cavity of the large wheel hub body 601. A first sealing plug 608 is used to plug the opening of the first roller shaft 607. A first toothed ring 609 is provided on the side of the large wheel hub cover 602 away from the large wheel hub body 601.

[0041] The small roller includes a small roller body 7 and a small roller hub 8. The small roller hub 8 includes a small hub body 801 and a small hub cover 802. A second liquid storage groove 803 is provided on the side of the small hub body 801 near the small hub cover 802. The small hub cover 802 is fastened into the opening of the second liquid storage groove 803 of the small hub body 801, forming a second liquid storage cavity between the small hub body 801 and the small hub cover 802. A plurality of second protrusions 804 are provided at one end of the small hub body 801 near the small hub cover 802. A plurality of second grooves 805 are provided on the side wall of the small hub cover 802, matching the second protrusions 804. The plurality of second protrusions 804 are inserted one-to-one into the plurality of second grooves 805. A gap is left at the connection between the second protrusions 804 and the second grooves 805 to form a second liquid outlet gap 806. The second liquid outlet gap 806 is interconnected with the second liquid storage chamber. The small roller body 7 is fitted onto the small roller hub 8. Liquid in the second liquid storage chamber fills the space between the small roller body 7 and the small roller hub 8 through the second liquid outlet gap 806. Numbers are engraved on the small roller body 7. When the small roller is rotated, liquid inside the small roller body 7 will seep out through the engraved numbers and be printed on the paper.

[0042] A second roller shaft 807 is provided on the side of the small hub body 801 away from the small hub cover 802. The second roller shaft 807 has a hollow structure, and its inner cavity is interconnected with the inner cavity of the small hub body 801. A second sealing plug 808 is used to plug the opening of the second roller shaft 807. A second toothed ring 809 is provided on the side of the small hub cover 802 away from the small hub body 801.

[0043] A roller bracket 9 is detachably connected to the open end of the outer casing 1. A limiting step 104 is provided on the open end of the outer casing 1. The roller bracket 9 is fitted onto the open end of the outer casing 1, with one side of the roller bracket 9 abutting against the step surface of the limiting step 104. A first shaft hole 10 is formed between one end of the roller bracket 9 and the bottom surface of one side of the outer casing 1, and the first roller shaft 607 of the large roller is rotatably connected within the first shaft hole 10. A second shaft hole 11 is formed between the other end of the roller bracket 9 and the bottom surface of the other side of the outer casing 1, and the second roller shaft 807 of the small roller is rotatably connected within the second shaft hole 11.

[0044] The synchronizing element 4 has a connecting shaft 401 in the middle, with a first gear 402 and a second gear 403 at its two ends. The lower end of the middle support 3 has an embedding groove 302, into which the connecting shaft 401 is embedded. The roller support 9 has a support frame 901 in the middle, forming a third shaft hole between the support frame 901 and the embedding groove 302, into which the connecting shaft 401 is rotatably connected. The first gear 402 is installed in the first gear ring 609 and meshes with the lower side of the first gear ring 609, forming the first gear 402 transmission structure. The second gear 403 is installed in the second gear ring 809 and meshes with the lower side of the second gear ring 809, forming the second gear 403 transmission structure. The first gear ring has more teeth than the second gear ring.

[0045] The large roller and / or the small roller are slidably fitted onto the outer casing 1, and a clutch structure is provided between the large roller and / or the small roller and the synchronizing member 4. In this specific embodiment, the large roller is slidably fitted onto the outer casing 1, and a clutch structure is provided between the large roller and the synchronizing member 4.

[0046] The first cavity 102 provides space for the large roller to slide, meaning the length of the first cavity 102 is greater than the length of the large roller, allowing the large roller to slide back and forth within the first cavity 102. The width of the sliding space is greater than the meshing width between the first gear ring 609 of the large roller and the first gear 402 of the synchronizing element 4. A return spring 12 is fitted onto the first roller shaft 607. One end of the return spring 12 abuts against the inner wall of the first cavity 102 away from the small roller, and the other end abuts against the side wall of the large roller away from the small roller. An annular embedding groove 610 is provided on the side wall of the large roller away from the small roller, and the end of the return spring 12 is embedded in the annular embedding groove 610. The return spring 12 and the first roller shaft 607 form the aforementioned clutch structure. The end of the first roller shaft 607 away from the large roller is exposed outside the outer casing 1. The end of the first roller shaft 607 is provided with a limiting protrusion ring 611, and a certain distance is left between the limiting protrusion ring 611 and the side wall of the outer casing 1.

[0047] The cover 2 has an opening at one end near the outer shell 1. The end of the cover 2 with the opening is fitted over the end of the outer shell 1 with the opening, and the cover 2 is located outside the roller bracket 9, covering the roller assembly.

[0048] The adjustable roller-type stamp disclosed in this application is used by removing the stamp cover 2, pressing the outer casing 1, attaching the large and small rollers to the paper, and then pushing the outer casing 1 to make the large and small rollers roll on the paper. Liquid from the large and small rollers seeps out from the numbers, thus printing the numbers onto the paper. Because the number of numbers on the large and small rollers is different, and the linear speed of the large and small rollers rolling on the paper is the same, the adjustable roller-type stamp of this application can automatically change the number combination, making it convenient for users and effectively improving the user experience.

[0049] When a quick adjustment of the numerical relationship between the large and small rollers is needed, for example, if ten questions are answered incorrectly and you want to redo them, this is necessary to print the ten questions. Holding the end of the first roller shaft 607, which has a limiting protrusion 611, pull the first roller shaft 607 away from the synchronizer 4. After pulling a certain distance, the first roller shaft 607 disengages from the synchronizer 4, allowing you to rotate the large roller and quickly adjust the numerical relationship between the large and small rollers. After adjustment, release the first roller shaft 607. Due to the return spring, the large roller will return to its original position and re-engage with the synchronizer 4. Then, press down on the outer casing 1, and the large and small rollers will print the ten questions. This structure allows for quick adjustment, eliminating the need for a long scrolling cycle to print the desired questions.

[0050] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. An adjustable roller stamp, comprising a housing (1), a roller assembly, and a stamp cover (2); one end of the housing (1) is provided with an opening, the roller assembly is mounted on the end of the housing (1) with the opening, and the stamp cover (2) is connected to the end of the housing (1) with the opening and covers the roller assembly; characterized in that: The roller assembly includes a large roller, a small roller, and a synchronizing element (4). The outer diameter of the large roller is larger than that of the small roller, and the number on the large roller is greater than that on the small roller. Both the large roller and the small roller are rotatably connected to the outer shell (1). The synchronizing element (4) is connected between the large roller and the small roller, and the synchronizing element (4) can drive the large roller and the small roller to rotate synchronously. One side of both the large roller and the small roller is exposed outside the outer shell (1), and one side of the large roller and one side of the small roller are on the same horizontal line. The large roller and / or the small roller are slidably fitted on the outer shell, and a clutch structure is provided between the large roller and / or the small roller and the synchronizing element (4). When it is necessary to quickly adjust the digital relationship between the large and small rollers, the large roller and / or the small roller can be separated from the synchronizing element, and the large roller and / or the small roller can be rotated to quickly adjust the relative position of the large and small rollers.

2. The adjustable roller stamp according to claim 1, characterized in that: A central support (3) is provided between the large roller and the small roller. The central support (3) is installed on the outer shell (1). The synchronizing element (4) is rotatably connected to the central support (3). The central support (3) divides the inner cavity of the outer shell (1) into a first cavity (102) and a second cavity (103). The large roller is installed in the first cavity (102), and the small roller is installed in the second cavity (103). The large roller is rotatably connected between one side of the central support (3) and the inner wall of one side of the outer shell (1). The small roller is rotatably connected between the other side of the central support (3) and the inner wall of the other side of the outer shell (1). The large roller is connected to one end of the synchronizing element (4) through a first gear transmission structure, and the small roller is connected to the other end of the synchronizing element (4) through a second gear transmission structure.

3. The adjustable roller stamp according to claim 2, characterized in that: The first gear (402) transmission structure includes a first gear ring (609) and a first gear (402). The first gear ring (609) is located on the side of the large roller near the synchronizing member (4), and the first gear (402) is located on the end of the synchronizing member (4) near the large roller. The first gear (402) is installed inside the first gear ring (609) and meshes with the lower side of the first gear ring (609).

4. The adjustable roller stamp according to claim 3, characterized in that: The second gear (403) transmission structure includes a second gear ring (809) and a second gear (403). The second gear ring (809) is located on the side of the small roller near the synchronizing member (4), and the second gear (403) is located on the end of the synchronizing member (4) near the small roller. The second gear (403) is installed inside the second gear ring (809) and meshes with the lower side of the second gear ring (809).

5. The adjustable roller stamp according to claim 4, characterized in that: The middle part of the synchronizing component (4) is a connecting shaft (401), which is connected between the first gear (402) and the second gear (403); the lower end of the middle bracket (3) is provided with an embedding groove (302), and the connecting shaft (401) is embedded in the embedding groove (302).

6. The adjustable roller stamp according to claim 4, characterized in that: A roller bracket (9) is provided on the end of the outer shell (1) with an opening. A first shaft hole (10) is formed between one end of the roller bracket (9) and the bottom surface of one side of the outer shell (1). A first roller shaft (607) is provided at one end of the large roller near the first shaft hole (10). The first roller shaft (607) is rotatably connected in the first shaft hole (10). A second shaft hole (11) is formed between the other end of the roller bracket (9) and the bottom surface of the other side of the outer shell (1). A second roller shaft (807) is provided at one end of the small roller near the second shaft hole (11). The second roller shaft (807) is rotatably connected in the second shaft hole (11).

7. The adjustable roller stamp according to claim 6, characterized in that: The first cavity (102) provides space for the large roller to slide, and the large roller slides within the first cavity (102). A return spring (12) is fitted on the first roller shaft (607). One end of the return spring (12) abuts against the inner wall of the first cavity (102) away from the small roller, and the other end of the return spring (12) abuts against the side wall of the large roller away from the small roller. The return spring (12) and the first roller shaft (607) form the clutch structure.

8. The adjustable roller stamp according to claim 7, characterized in that: The end of the first roller shaft (607) away from the large roller is exposed outside the outer shell (1). The end of the first roller shaft (607) is provided with a limiting protrusion ring (611), and there is a certain distance between the limiting protrusion ring (611) and the side wall of the outer shell (1).

9. The adjustable roller stamp according to claim 7, characterized in that: The large roller has an annular embedding groove (610) on its side wall away from the small roller, and the end of the return spring (12) is embedded in the annular embedding groove (610).

10. The adjustable roller stamp according to claim 6, characterized in that: The large roller includes a large roller body (5) and a large roller hub (6). The large roller body (5) is fitted onto the large roller hub (6). The large roller hub (6) has a first liquid storage chamber inside. The side wall of the large roller has a first liquid outlet gap (606). The first liquid outlet gap (606) is connected to the first liquid storage chamber. The liquid in the first liquid storage chamber fills the space between the large roller body (5) and the large roller hub (6) through the first liquid outlet gap (606).

11. The adjustable roller stamp according to claim 10, characterized in that: The large roller hub (6) includes a large hub body (601) and a large hub cover (602). The large hub body (601) has a first liquid storage tank (603) on the side near the large hub cover (602). The large hub cover (602) is fastened to the opening of the first liquid storage tank (603) of the large hub body (601). The large hub body (601) and the large hub cover (602) form the first liquid storage cavity. A gap is left at the connection between the large hub cover (602) and the large hub body (601) to form the first liquid outlet gap (606).

12. The adjustable roller stamp according to claim 11, characterized in that: The first roller shaft (607) is located on the side of the large hub body (601) away from the large hub cover (602). The first roller shaft (607) is a hollow structure. The inner cavity of the first roller shaft (607) is connected to the inner cavity of the large hub body (601). The opening of the first roller shaft (607) is blocked by a first sealing plug (608). The first gear ring (609) is located on the side of the large hub cover (602) away from the large hub body (601).

13. The adjustable roller stamp according to claim 11, characterized in that: The large hub body (601) is provided with a plurality of first protrusions (604) at one end near the large hub cover (602). The side wall of the large hub cover (602) is provided with a plurality of first grooves (605) that match the first protrusions (604). The plurality of first protrusions (604) are inserted into the plurality of first grooves (605) one by one. A gap is left at the connection between the first protrusions (604) and the first grooves (605) to form the first liquid outlet gap (606).

14. The adjustable roller stamp according to claim 6, characterized in that: The small roller includes a small roller body (7) and a small roller hub (8). The small roller body (7) is fitted onto the small roller hub (8). The small roller hub (8) has a second liquid storage chamber inside. The side wall of the small roller has a second liquid outlet gap (806). The second liquid outlet gap (806) is connected to the second liquid storage chamber. The liquid in the second liquid storage chamber fills the space between the small roller body (7) and the small roller hub (8) through the second liquid outlet gap (806).

15. The adjustable roller stamp according to claim 14, characterized in that: The small roller hub (8) includes a small hub body (801) and a small hub cover (802). The small hub body (801) has a second liquid storage tank (803) on the side near the small hub cover (802). The small hub cover (802) is fastened to the opening of the second liquid storage tank (803) of the small hub body (801). The small hub body (801) and the small hub cover (802) form the second liquid storage cavity. A gap is left at the connection between the small hub cover (802) and the small hub body (801) to form the second liquid outlet gap (806).

16. The adjustable roller stamp according to claim 15, characterized in that: The second roller shaft (807) is located on the side of the small hub body (801) away from the small hub cover (802). The second roller shaft (807) is a hollow structure. The inner cavity of the second roller shaft (807) is connected to the inner cavity of the small hub body (801). The opening of the second roller shaft (807) is blocked by a second sealing plug (808). The second gear ring (809) is located on the side of the small hub cover (802) away from the small hub body (801).

17. The adjustable roller stamp according to claim 15, characterized in that: The small hub body (801) is provided with a plurality of second protrusions (804) at one end near the small hub cover (802). The side wall of the small hub cover (802) is provided with a plurality of second grooves (805) that match the second protrusions (804). The plurality of second protrusions (804) are inserted into the plurality of second grooves (805) one by one. A gap is left at the connection between the second protrusions (804) and the second grooves (805) to form the second liquid outlet gap (806).

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