Printer flip multifunctional integrated structure
By integrating the pressing component, transmission component, locking component, and paper stop adjustment component, the design solves the problems of large pressing stroke and high friction during paper stop adjustment in the printer flip-top structure. It achieves a flip-top structure with short pressing to open the cover, synchronous linkage at both ends, and strong adaptability, thus improving the user experience and assembly convenience.
Patent Information
- Application Number
- CN202511250121.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-03
- Publication Date
- 2025-11-11
AI Technical Summary
The existing printer flip-top structure has a large pressing stroke, making operation cumbersome and difficult to achieve synchronous linkage between the two ends. The paper stop adjustment has high friction and is not suitable for the upper and lower shell structure, which affects the user experience and ease of use.
It adopts an integrated structure of pressing component, transmission component, locking component and paper stop adjustment component to realize short-stroke pressing to open the cover, synchronous linkage at both ends and paper stop adjustment. The pressing stroke is reduced by lever principle, gear meshing ensures synchronous unlocking, and roller friction replaces sliding friction to reduce paper resistance.
It reduces the pressure required by the user, improves ease of operation, adapts to different user habits, reduces the risk of paper wrinkling, is suitable for upper and lower shell structures, and simplifies the assembly process.
Smart Images

Figure CN120921829A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of printer structural design, and in particular to a multi-functional integrated structure for a printer flip cover. Background Technology
[0002] In printers, the convenience of the flip-top mechanism and the smoothness of paper stop adjustment directly impact the user experience. Currently, the flip-top mechanism of printers has certain defects in its press-to-open design. In some designs, the ratio of the opening press stroke to the locking stroke is unreasonable, with the opening stroke even exceeding the locking stroke. This forces users to apply significant pressure and press for a considerable distance to open the flip-top, making the operation cumbersome and laborious, severely affecting the user experience. Furthermore, some flip-top mechanisms struggle to achieve simultaneous unlocking from both ends or only support single-side button operation, failing to meet the operating habits of different users and exhibiting poor applicability. In addition, the design of existing locking mechanisms also has limitations. Some hook-type mechanisms are not compatible with locking pin-type applications, limiting their use in certain printer models. Regarding paper stop adjustment, existing printer paper stop adjustment mechanisms also have shortcomings. Some adjustment block structures generate significant friction during paper feeding. When paper is inserted, its soft texture makes it prone to wrinkling and curling under friction, affecting print quality. Moreover, the installation method of this type of paper-blocking adjustment structure is relatively fixed, making it difficult to adapt to the upper and lower shell printer structure. This imposes significant limitations on assembly and application scenarios, causing inconvenience to production and actual use.
[0003] Therefore, in view of the problems existing in the printer flip cover and paper stop adjustment structure, there is an urgent need for a structure that can achieve short-distance press to open the cover, synchronous linkage at both ends, smooth paper stop adjustment, and strong adaptability, so as to improve the overall performance of the printer.
[0004] Therefore, the existing field of printer structural design needs further improvement. Summary of the Invention
[0005] The purpose of this invention is to provide a multi-functional integrated structure for a printer flip-top. This invention aims to solve the following problems existing in the prior art: the opening and pressing stroke is large, resulting in a poor user experience; the opening structure is difficult to achieve synchronous linkage at both ends, or only supports single-sided operation; the paper-blocking adjustment structure has high friction, which easily causes paper wrinkles and is not suitable for scenarios with upper and lower shell structures.
[0006] To achieve the above objectives, the present invention adopts the following solution: A printer flip-top multi-functional integrated structure includes a flip-top for closing, a base for support, a pressing component for triggering the opening action, a locking component for locking and unlocking, and a transmission component for transmitting force; as well as a paper stop adjustment component for adjusting paper feed. The pressing component is mounted on the base, the locking component is respectively disposed on the flip cover and the base, and the transmission component connects the pressing component and the locking component; When the pressing component is pressed, the transmission component transmits the force to the locking component, causing the locking component to release the locking of the flip cover and the base, and the pressing stroke of the pressing component is less than the unlocking stroke of the locking component; The paper-stop adjustment component is used to adapt to paper of different widths and reduce paper feeding friction.
[0007] Furthermore, the pressing component includes a button, a button sleeve, and a first elastic element; the button sleeve has a locking hole, the button has a buckle and a sliding groove, the button is engaged in the button sleeve and can slide along the button sleeve, the first elastic element is disposed between the button and the button sleeve, and under the force of the first elastic element, the buckle abuts against the locking hole to limit the button.
[0008] Furthermore, the transmission assembly includes a rocker arm; one end of the rocker arm is provided with a first cylinder, and the middle part is provided with a second cylinder; the first cylinder is sleeved with the circular hole of the button sleeve, and the second cylinder is sleeved with the sliding groove of the button, the sliding groove being inclined; when the button is pressed, the sliding groove exerts a force on the second cylinder, causing the rocker arm to rotate around the first cylinder.
[0009] Furthermore, the locking assembly includes a locking pin, a second elastic element, and a push block; the base has a groove in the middle to accommodate the flip cover, and sidewalls are provided at both ends of the groove. The sidewalls are provided with lock holes, and the push block is disposed in the lock holes and can slide horizontally; the flip cover has locking pins at both ends corresponding to the lock holes, and the locking pins can slide horizontally within the flip cover; the second elastic element is disposed between the locking pin and the flip cover, and under the force of the second elastic element, one end of the locking pin extends out of the flip cover and can be inserted into the lock hole; when the rocker arm rotates, it pushes the push block to move, and the push block pushes the locking pin back into the flip cover to achieve unlocking.
[0010] Furthermore, the locking assembly also includes a gear; one end of the locking pin located inside the flip cover is provided with a rack, the gear is disposed inside the flip cover, and the racks of the locking pins at both ends respectively mesh with the two sides of the gear, so that the movement directions of the locking pins at both ends are opposite.
[0011] Furthermore, it also includes a detection component; the detection component includes a third elastic element, a baffle, and a sensor; the third elastic element is disposed between the push block and the side wall, and the force of the third elastic element is less than the force of the second elastic element; the baffle is integrally formed with the push block, and the sensor is disposed above the baffle to detect the position of the baffle to determine the closed or open state.
[0012] Furthermore, the sidewalls at both ends of the base groove have an integral structure on one side and a detachable structure on the other side.
[0013] Furthermore, the paper-stopping adjustment assembly includes an adjustment block, a roller, a rotating shaft, and a return spring; The adjusting block is elongated, with a paper-blocking wall on the side, a roller shaft on the back, a spring baffle on the bottom, and one end connected to the rotating shaft. The roller is sleeved on the roller shaft and can rotate around it. The rotating shaft is hinged to the inner lining of the flip cover. The return spring is disposed between the spring baffle and the inner lining of the flip cover. Under the force of the return spring, the free end of the adjusting block is attached to the inclined surface of the inner lining of the flip cover.
[0014] Furthermore, the flip cover includes a first flip cover liner and a second flip cover liner; The first flip cover liner has a first inclined surface and a V-shaped opening, and the second flip cover liner has a second inclined surface and a horizontal V-shaped structure. The second flip cover liner is inserted into the V-shaped opening of the first flip cover liner through the horizontal V-shaped structure. The first inclined surface and the second inclined surface cooperate to form the upper and lower walls of the paper feeding channel, and the roller of the adjusting block abuts against the upper edge of the first inclined surface.
[0015] Furthermore, the second flip cover liner has semi-circular locking holes and spring posts on both sides; The rotating shaft of the adjusting block engages with the semi-circular locking hole, and the reset spring is sleeved on the spring post with its two ends abutting against the spring baffle and the inner lining of the second flip cover, respectively. When the flip cover is closed, the semi-circular locking hole forms a closed hole, causing the rotating shaft to form a rotating pair.
[0016] In summary, the advantages of this invention over the prior art are: This invention addresses the shortcomings of existing printer structural designs. Through its structural design, it offers the following advantages and benefits compared to existing technologies: By utilizing the lever principle of the transmission component, the pressing stroke of the pressing component is less than the unlocking stroke of the locking component, reducing the user's pressing distance and improving the user experience. The meshing structure of gears and locking pins enables synchronous reverse movement of the locking pins at both ends, supporting single or double button presses for unlocking, adapting to different user operating habits. The sliding friction in paper guide adjustment is converted into rolling friction of the rollers, reducing paper insertion resistance and lowering the risk of paper curling and wrinkling. The mounting structure of the paper guide adjustment component is suitable for both upper and lower shell scenarios, and the overall structure is simple and efficient to assemble, facilitating production applications. Attached Figure Description
[0017] Figure 1 This is an exploded view of the present invention; Figure 2 This is a schematic diagram of the internal parts of the present invention; Figure 3 This is a part diagram of the short-range press-to-open structure of the present invention; Figure 4 This is an exploded view of the short-range press-to-open structure of the present invention; Figure 5 This is a cross-sectional view of the short-range press-to-open structure of the present invention. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] Please see Figures 1-5 The present invention provides a multi-functional integrated structure for a printer flip cover, including a flip cover 1000 for closing, a base 2000 for supporting, a pressing component 100 for triggering the opening action, a locking component 300 for locking and unlocking, and a transmission component 200 for transmitting force; and a paper stop adjustment component 500 for adjusting paper feed. The pressing component 100 is mounted on the base 2000, the locking component 300 is respectively disposed on the flip cover 1000 and the base 2000, and the transmission component 200 connects the pressing component 100 and the locking component 300; When the pressing component 100 is pressed, the transmission component 200 transmits the force to the locking component 300, causing the locking component 300 to release the locking of the flip cover 1000 and the base 2000, and the pressing stroke of the pressing component 100 is less than the unlocking stroke of the locking component 300. The paper-stop adjustment component 500 is used to adapt to paper of different widths and reduce paper feeding friction. This structure integrates a flip cover 1000, a base 2000, a pressing component 100, a locking component 300, a transmission component 200, and the paper-stop adjustment component 500. The pressing component 100 is mounted on the base 2000 and transmits force to the locking component 300 through the transmission component 200, unlocking the flip cover 1000 from the base 2000. Due to the force transmission characteristics of the transmission component 200, the pressing stroke of the pressing component 100 is less than the unlocking stroke of the locking component 300, achieving short-stroke pressing to open the cover. Simultaneously, the paper-stop adjustment component 500 adapts to paper of different widths and reduces friction, ensuring smooth paper feeding.
[0020] The pressing assembly 100 of the present invention includes a button 1, a button sleeve 2, and a first elastic element 20. The button sleeve 2 has a locking hole, and the button 1 has a buckle 40 and a sliding groove 4. The button 1 is engaged within the button sleeve 2 and can slide along the button sleeve 2. The first elastic element 20 is disposed between the button 1 and the button sleeve 2. Under the force of the first elastic element 20, the buckle 40 abuts against the locking hole to limit the button 1. In the pressing assembly 100, the button 1 is engaged with the locking hole of the button sleeve 2 through the buckle 40 and can slide along the button sleeve 2. The first elastic element 20 is located between the button 1 and the button sleeve 2, and its elasticity keeps the buckle 40 abutting against the locking hole, limiting the pop-out position of the button 1. When the button 1 is pressed, the button 1 slides against the force of the first elastic element 20; after being released, the restoring force of the first elastic element 20 drives the button 1 back to its initial position, realizing the reciprocating motion and limiting of the button.
[0021] The transmission assembly 200 of the present invention includes a rocker arm 5; one end of the rocker arm 5 is provided with a first cylinder 6, and the middle part is provided with a second cylinder 7; the first cylinder 6 is sleeved with the circular hole of the button sleeve 2, and the second cylinder 7 is sleeved with the sliding groove 4 of the button 1, the sliding groove 4 being inclined; when the button 1 is pressed, the sliding groove 4 exerts a force on the second cylinder 7, causing the rocker arm 5 to rotate around the first cylinder 6; the rocker arm 5 of the transmission assembly 200 forms a rotation fulcrum through the first cylinder 6 sleeved with the circular hole of the button sleeve 2, and the middle part of the second cylinder 7 is inserted into the inclined sliding groove 4 of the button 1. When the button 1 is pressed, the inclined sliding groove 4 exerts a lateral thrust on the second cylinder 7, forcing the rocker arm 5 to rotate around the first cylinder 6, converting the linear motion of the button 1 into the rotational motion of the rocker arm 5, realizing the conversion and transmission of force direction.
[0022] The locking assembly 300 of the present invention includes a locking pin 8, a second elastic element 80, and a push block 10; the base 2000 has a groove in the middle for accommodating the flip cover 1000, and sidewalls at both ends of the groove, each sidewall having a locking hole 11; the push block 10 is disposed within the locking hole 11 and can slide horizontally; the flip cover 1000 has the locking pin 8 at both ends corresponding to the locking hole 11, the locking pin 8 can slide horizontally within the flip cover 1000, and the second elastic element 80 is disposed within the locking pin 8. Between the flip cover 1000 and the base 2000, under the force of the second elastic element 80, one end of the locking pin 8 extends out of the flip cover 1000 and can be inserted into the lock hole 11; when the rocker arm 5 rotates, it pushes the push block 10 to move, and the push block 10 pushes the locking pin 8 back into the flip cover 1000 to unlock; in the locking assembly 300, the second elastic element 80 pushes the locking pin 8 of the flip cover 1000 to extend and insert into the lock hole 11 on the side wall of the base 2000, thereby locking the flip cover and the base. When the rocker arm 5 rotates, it pushes the push block 10 in the lock hole 11 to move horizontally, and the push block 10 then pushes the locking pin 8 to overcome the force of the second elastic element 80 and retract into the flip cover 1000, releasing the lock and completing the opening of the cover.
[0023] The locking assembly 300 of the present invention further includes a gear 12; one end of the locking pin 8 located inside the flip cover 1000 is provided with a rack, and the gear 12 is disposed inside the flip cover 1000. The racks of the two ends of the locking pin 8 respectively mesh with the two sides of the gear 12, so that the two ends of the locking pin 8 move in opposite directions; the gear 12 of the locking assembly 300 is installed inside the flip cover 1000, and the racks of the two ends of the locking pin 8 respectively mesh with the two sides of the gear 12. When one end of the locking pin 8 is pushed back by the push block 10, the other end of the locking pin 8 retracts synchronously in the opposite direction through the meshing transmission of the gear 12, ensuring that the locking structures at both ends unlock simultaneously and avoiding uneven force on the flip cover 1000.
[0024] The present invention also includes a detection component 400; the detection component 400 includes a third elastic element 13, a baffle 14, and a sensor 15; the third elastic element 13 is disposed between the push block 10 and the side wall, and the force of the third elastic element 13 is less than the force of the second elastic element 80; the baffle 14 is integrally formed with the push block 10, and the sensor 15 is disposed above the baffle 14 for detecting the position of the baffle 14 to determine the closed or open state; in the detection component 400, the force of the third elastic element 13 is less than that of the second elastic element 80, ensuring that when locked, the locking pin 8 can push the push block 10 to compress the third elastic element 13. The baffle 14 of the push block 10 moves with the push block, and the sensor 15 determines the state by detecting the position of the baffle 14: when closed, the baffle 14 moves backward with the push block 10, and the sensor 15 detects that the cover is closed; after opening, the third elastic element 13 pushes the push block 10 to reset, the position of the baffle 14 changes, and the sensor 15 detects that the cover is open.
[0025] The sidewalls at both ends of the groove of the base 2000 described in this invention have an integral structure on one side and a detachable structure on the other side. The integral structure ensures that the locking component 300 on one side is installed firmly, while the detachable structure facilitates the assembly, maintenance or replacement of the locking component 300 on the other side, thus balancing structural strength and maintenance convenience.
[0026] The paper-stopping adjustment assembly 500 of the present invention includes an adjustment block 501, a roller 502, a rotating shaft 503, and a return spring; The adjusting block 501 is elongated, with a paper-blocking wall 505 on the side, a roller shaft 506 on the back, a spring baffle 507 on the bottom, and one end connected to the rotating shaft 503. The roller 502 is sleeved on the roller shaft 506 and can rotate around it. The rotating shaft 503 is hinged to the inner lining of the flip cover 1000. The return spring is disposed between the spring baffle 507 and the inner lining of the flip cover 1000. Under the force of the return spring, the free end of the adjusting block 501 is in contact with the inclined surface 508 of the inner lining of the flip cover 1000. In the paper stop adjusting assembly 500, the adjusting block 501 is hinged to the inner lining of the flip cover 1000 through the rotating shaft 503. The return spring pushes the free end of the adjusting block 501 to contact the inclined surface 508 of the inner lining of the flip cover. The function of the paper adjusting assembly is to limit the paper size for two types of paper: when printing narrow-width paper, the paper passes between the paper stop walls 505; when printing wide-width paper, the paper passes over the roller.
[0027] The present invention is characterized in that the flip cover 1000 includes a first flip cover liner 509 and a second flip cover liner 510; The first flip cover liner 509 is provided with a first inclined surface 511 and a V-shaped opening, and the second flip cover liner 510 is provided with a second inclined surface 512 and a horizontal V-shaped structure. The second flip cover liner 510 is inserted into the V-shaped opening of the first flip cover liner 509 through the horizontal V-shaped structure. The first inclined surface 511 and the second inclined surface 512 cooperate to form the upper and lower walls of the paper feeding channel. The roller 502 of the adjusting block 501 abuts against the upper edge of the first inclined surface 511. The first flip cover liner 509 and the second flip cover liner 510 of the flip cover 1000 are inserted into the horizontal V-shaped structure through a V-shaped opening. The first inclined surface 511 and the second inclined surface 512 form the upper and lower walls of the paper feeding channel. The roller 502 of the adjusting block 501 abuts against the upper edge of the first inclined surface 511 to ensure that the roller 502 effectively contacts and rolls when the paper passes through, adapting to different paper widths while reducing friction.
[0028] The invention is characterized in that the second flip cover liner 510 is provided with semi-circular locking holes 513 and spring posts on both sides; The rotating shaft 503 of the adjusting block 501 is engaged with the semi-circular locking hole 513, and the reset spring 504 is sleeved on the spring post and its two ends abut against the spring baffle 507 and the second flip cover liner 510 respectively. When the flip cover 1000 is closed, the semi-circular locking hole 513 forms a closed hole, making the rotating shaft 503 a rotating pair; the semi-circular locking hole 513 of the second flip cover liner 510 engages with the rotating shaft 503 of the adjusting block 501, and the return spring is sleeved on the spring post, with its two ends abutting against the spring baffle 507 and the second flip cover liner 510 respectively. When the flip cover 1000 is closed, the semi-circular locking hole 513 forms a closed hole, making the rotating shaft 503 rotate stably, ensuring that the adjusting block 501 can flexibly adapt to different widths of paper, while simplifying the assembly process.
[0029] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A multi-functional integrated structure for a printer flip-top, characterized in that, It includes a flip cover (1000) for closing, a base (2000) for support, a pressing component (100) for triggering the opening action, a locking component (300) for locking and unlocking, and a transmission component (200) for transmitting force; and a paper stop adjustment component (500) for adjusting paper feed. The pressing component (100) is mounted on the base (2000), the locking component (300) is respectively disposed on the flip cover (1000) and the base (2000), and the transmission component (200) connects the pressing component (100) and the locking component (300); When the pressing component (100) is pressed, the transmission component (200) transmits the force to the locking component (300), causing the locking component (300) to release the locking of the flip cover (1000) and the base (2000), and the pressing stroke of the pressing component (100) is less than the unlocking stroke of the locking component (300); The paper stop adjustment assembly (500) is used to adapt to paper of different widths and reduce paper feeding friction.
2. The printer flip-top multi-functional integrated structure according to claim 1, characterized in that, The pressing assembly (100) includes a button (1), a button sleeve (2), and a first elastic element (20). The button sleeve (2) has a locking hole, and the button (1) has a buckle (40) and a sliding groove (4). The button (1) is locked inside the button sleeve (2) and can slide along the button sleeve (2). The first elastic element (20) is disposed between the button (1) and the button sleeve (2). Under the force of the first elastic element (20), the buckle (40) abuts against the locking hole to limit the button (1).
3. The printer flip-top multi-functional integrated structure according to claim 2, characterized in that, The transmission assembly (200) includes a rocker arm (5); one end of the rocker arm (5) is provided with a first cylinder (6), and the middle part is provided with a second cylinder (7); the first cylinder (6) is sleeved with the round hole of the button sleeve (2), and the second cylinder (7) is sleeved with the sliding groove (4) of the button (1), and the sliding groove (4) is inclined; when the button (1) is pressed, the sliding groove (4) exerts a force on the second cylinder (7), causing the rocker arm (5) to rotate around the first cylinder (6).
4. The printer flip-top multi-functional integrated structure according to claim 3, characterized in that, The locking assembly (300) includes a locking pin (8), a second elastic element (80), and a push block (10); the base (2000) has a groove in the middle to accommodate the flip cover (1000), and sidewalls at both ends of the groove. The sidewalls have locking holes (11), and the push block (10) is disposed in the locking holes (11) and can slide horizontally; the flip cover (1000) has locking pins (8) at both ends corresponding to the locking holes (11), and the locking pins (8) can be engaged with the flip cover. (1000) slides horizontally. The second elastic element (80) is disposed between the locking pin (8) and the flip cover (1000). Under the force of the second elastic element (80), one end of the locking pin (8) extends out of the flip cover (1000) and can be inserted into the lock hole (11). When the swing rod (5) rotates, it pushes the push block (10) to move. The push block (10) pushes the locking pin (8) back into the flip cover (1000) to unlock.
5. The printer flip-top multi-functional integrated structure according to claim 4, characterized in that, The locking assembly (300) also includes a gear (12); the locking pin (8) is provided with a rack at one end inside the flip cover (1000), the gear (12) is provided inside the flip cover (1000), and the racks of the locking pins (8) at both ends are respectively engaged with the sides of the gear (12), so that the movement directions of the locking pins (8) at both ends are opposite.
6. The printer flip-top multi-functional integrated structure according to claim 5, characterized in that, It also includes a detection component (400); the detection component (400) includes a third elastic element (13), a baffle (14) and a sensor (15); the third elastic element (13) is disposed between the push block (10) and the side wall, and the force of the third elastic element (13) is less than the force of the second elastic element (80); the baffle (14) is integrally formed with the push block (10), and the sensor (15) is disposed above the baffle (14) for detecting the position of the baffle (14) to determine the closed or open state.
7. The printer flip-top multi-functional integrated structure according to claim 1, characterized in that, The sidewalls at both ends of the groove of the base (2000) are of an integral structure on one side and a detachable structure on the other side.
8. The printer flip-top multi-functional integrated structure according to claim 7, characterized in that, The paper stop adjustment assembly (500) includes an adjustment block (501), a roller (502), a rotating shaft (503), and a return spring; The adjusting block (501) is long and narrow, with a paper-blocking wall (505) on the side, a roller shaft (506) on the back, a spring baffle (507) on the bottom, and one end connected to the rotating shaft (503). The roller (502) is sleeved on the roller shaft (506) and can rotate around it. The rotating shaft (503) is hinged to the inner lining of the flip cover (1000). The return spring is disposed between the spring baffle (507) and the inner lining of the flip cover (1000). Under the action of the return spring, the free end of the adjusting block (501) is attached to the inclined surface (508) of the inner lining of the flip cover (1000).
9. A multi-functional integrated structure for a printer flip-top according to claim 8, characterized in that, The flip cover (1000) includes a first flip cover liner (509) and a second flip cover liner (510); The first flip cover liner (509) is provided with a first inclined surface (511) and a V-shaped opening, and the second flip cover liner (510) is provided with a second inclined surface (512) and a horizontal V-shaped structure. The second flip cover liner (510) is inserted into the V-shaped opening of the first flip cover liner (509) through the horizontal V-shaped structure. The first inclined surface (511) and the second inclined surface (512) cooperate to form the upper and lower walls of the paper feeding channel, and the roller (502) of the adjusting block (501) abuts against the upper edge of the first inclined surface (511).
10. A multi-functional integrated structure for a printer flip-top according to claim 9, characterized in that, The second flip cover liner (510) has semi-circular snap holes (513) and spring posts on both sides; The pivot (503) of the adjusting block (501) is engaged with the semi-circular locking hole (513), and the reset spring (504) is sleeved on the spring post and its two ends abut against the spring baffle (507) and the second flip cover liner (510) respectively. When the flip cover (1000) is closed, the semi-circular locking hole (513) forms a closed hole, making the rotating shaft (503) a rotating pair.