Highly integrated printer core module and printer

Abstract

The utility model provides a highly integrated printer core module and a printer, the highly integrated printer core module comprises a printing head and a rubber roller driving mechanism which are arranged on a main frame body, the main frame body is provided with a paper feeding channel, and the main frame body is also provided with a rubber roller quick release mechanism and a paper limiter adjusting mechanism; according to the rubber roller quick disassembling machine, containing grooves with openings are formed in the two side edges of a main frame body respectively, hooking pieces are arranged at the positions, opposite to the corresponding containing grooves, of the main frame body, unlocking pieces are arranged on the hooking pieces and located on the side, facing an upper cover, of the main frame body, and reset pieces are further arranged between the hooking pieces and the main frame body; the paper limiting device adjusting mechanism comprises a telescopic hole which is formed in the main frame body and can be communicated with the paper feeding channel, a paper limiting piece can be movably installed in the telescopic hole, all functions are concentrated on the main frame body of the machine core, and therefore the problem that due to different installation standards, accumulative errors are too large is solved. The paper limiting sheet is inserted or pulled out through the telescopic hole to change the size of the paper feeding channel, and a huge transverse displacement space does not need to be reserved.

Description

A highly integrated printer core module and printer Technical Field

[0001] This utility model relates to the field of printer technology, and in particular to a highly integrated printer core module and printer. Background Technology

[0002] Most existing thermal printers consist of two components along the paper path, upper and lower, connected by hinges to separate the upper and lower components by a side-opening or rear-opening mechanism. The upper and lower components are then fixed in relative position by hooks. In this structure, the printhead and roller are each located on one of the components (with different assembly references). For example, the printhead is mounted on the main support or upper cover in the housing base, while the roller is mounted on the upper cover or main support. This results in the upper paper guide surface being located on the upper component (see Figures 1 and 2), and the lower paper guide surface being located on the lower component. Since the hinged connection between the two components also introduces some error, multiple connection points can cause excessive cumulative deviation between the printhead and roller, leading to various printing problems, as illustrated in the utility model patent CN112477439B - Thermal Printer. Furthermore, traditional printer paper limiters are typically designed as movable paper limiters to accommodate various paper types, along with a sliding groove located on the upper or lower side of the paper path within the main frame of the printer mechanism. The axis of the sliding groove is perpendicular to the paper feed direction. To accommodate various paper types, the paper limiter can slide freely within the sliding groove and stop at any position, achieving stepless adjustment. However, in actual use, two types of paper are usually used. Since the paper limiter needs to move, sufficient space must be left on the main frame. This results in the existing paper limiter structure occupying too much space, preventing further reduction in printer size, as shown in patent document CN 218257370 U. Summary of the Invention

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a highly integrated printer core module and printer.

[0004] This utility model is achieved using the following method: a highly integrated printer core module, including a main frame body, and a print head and a rubber roller drive mechanism disposed on the main frame body. The main frame body integrates a paper feeding channel. The main frame body has an upper paper guide block and a lower paper guide block on the paper feeding side of the paper feeding channel, both integrally formed with the main frame body. The lower surface of the upper paper guide block forms an upper paper guide surface, and the upper surface of the lower paper guide block forms a lower paper guide surface. The main frame body has a battery compartment for housing the battery, and the circuit board is mounted on the main frame body. The main frame body also has a rubber roller quick-release mechanism and a paper limiter adjustment mechanism. The rubber roller quick-release mechanism includes two sides of the main frame body respectively provided with… The main frame body has an open receiving slot, and a movable hook is provided on the main frame body at a position opposite to the receiving slot. The hook is provided with an unlocking part, which is located on the side of the main frame body facing the upper cover. A reset part is also provided between the hook and the main frame body. When the rubber roller is inserted into the receiving slot, the top of the print head abuts against the rubber roller. The paper limiter adjustment mechanism includes a telescopic hole on the main frame body that can communicate with the paper feeding channel. The paper limiter can be movably installed in the telescopic hole. When the paper limiter extends into the paper feeding channel, the paper feeding channel is partially blocked. When the paper limiter is fully or partially retracted into the telescopic hole, the paper feeding channel is released from the paper limiter.

[0005] Preferably, the printhead includes a printhead body and a push spring, the push spring being installed between the printhead body and the main frame body for pushing the printhead body toward the rubber roller; the hook is hinged to the side of the main frame body, and the hook is capable of swinging from one side of the receiving groove to the other side; or, the hook is movably installed on the side of the main frame body, and the hook is capable of moving from one side of the receiving groove to the other side.

[0006] Preferably, the hook is hinged to the main frame body, and the unlocking member is a pressing section provided on the hook; the pressing section is located on a section of the hook away from the hinge point and away from the receiving groove; the pressing section protrudes from the section of the hook away from the hinge point and is provided with a bent pressing portion toward the outside of the main frame body; the side of the main frame body that contacts the corresponding hook is provided with a first rib or a first groove; or, the surface of the hook that contacts the side of the main frame body is provided with a first rib or a first groove.

[0007] Preferably, the hook is a latch, and the latch has a first slot on the side facing the receiving groove. The first slot can penetrate into the receiving groove and block the opening end of the receiving groove. The first slot is C-shaped, and the opening of the first slot is located at the lower part of the side facing the receiving groove of the latch. The upper part of the side of the receiving groove away from the latch expands outward. The upper surface of the side facing the receiving groove of the latch, in the reset state, together with the side of the receiving groove away from the latch, forms a V-shaped guide surface. Both sides of the main frame body are provided with guide limiting grooves, which are adjacent to the receiving groove. The hook is installed in the guide limiting groove. The inner end face of the guide limiting groove is provided with the first protrusion or the first groove. When the guide limiting groove is close to the receiving groove and abuts against the hook, the hook is in a state where it can hook the rubber roller.

[0008] Preferably, the telescopic hole has one or more first positioning parts, and the paper limiting piece has a second positioning part that cooperates with it, for fixing the paper limiting piece in a designated position.

[0009] Preferably, the second positioning part is a first elastic arm provided on the side of the limiting paper sheet, and the first positioning part is a second slot provided on the inner wall of the telescopic hole. The first elastic arm can elastically deform and be inserted into the second slot. The first elastic arm is composed of a second rib provided on one side surface of the limiting paper sheet and a second groove provided on the other side surface opposite to the second rib.

[0010] Preferably, the first positioning part includes a plurality of second slots, the telescopic hole has a rectangular cross-section, and the telescopic hole has second slots on two opposite surfaces, which are symmetrically arranged; the paper limiting piece has a pressing piece at one end away from the paper feeding channel; the paper feeding channel feeds paper in the center, and there are two telescopic holes, which are symmetrically arranged along the center line of the paper feeding channel; or, the paper feeding channel feeds paper on one side, and there is one telescopic hole, which is spaced apart from the aligned side of the paper feeding channel.

[0011] Preferably, the main frame body has a positioning groove on the bottom or top surface at the inlet and / or outlet end of the paper feeding channel. A sensor is installed in the positioning groove, and the sensor has a third positioning part. The cross-sectional dimension of the third positioning part is larger than that of the positioning groove. A top is provided in the main frame body opposite to the positioning groove. An elastic element is provided between the top and the sensor. When the elastic element is located between the top and the sensor, it undergoes elastic deformation. The elastic element is a spring sheet. The spring sheet is M-shaped, C-shaped, Z-shaped, or U-shaped.

[0012] Another printer is provided, including a housing, wherein any of the above-mentioned highly integrated printer core modules are disposed within the housing; the housing has a button position, the button position is partially hollowed out, the hollowed-out portion of the button position has a pressing body and a second elastic arm, one end of the second elastic arm is connected to the pressing body, the other end of the second elastic arm is connected to the inner wall of the hollowed-out portion of the button position, there is a gap between the pressing body and the inner wall of the hollowed-out portion of the button position, the pressing body and the second elastic arm are integrally formed, and the second elastic arm is integrally formed with the housing.

[0013] Preferably, the side of the non-connecting end of the second elastic arm has a gap with the inner wall of the key cutout portion and a gap with the side of the pressing body; the pressing body and the second elastic arm divide the gap of the key cutout portion into a spiral shape; a first transition portion is provided at the connection between the second elastic arm and the inner wall of the key cutout portion, and a second transition portion is provided at the connection between the second elastic arm and the pressing body; the thickness of the first transition portion gradually decreases from the end in contact with the inner wall of the key cutout portion to the end away from it; the thickness of the second transition portion gradually decreases from the end in contact with the pressing body to the end away from it.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a highly integrated printer core module and printer. Compared with the prior art, this utility model has at least the following technical effects: 1. By directly setting receiving grooves for installing rubber rollers on both sides of the main frame body, the rubber rollers can be directly placed on the main frame body without first installing them on the top cover. Unlocking components are directly set on the hooks to drive the hooks to move and unlock. A printhead pusher for the rubber rollers is also installed in the main frame body. After the unlocking components drive the hooks to unlock, the rubber rollers can be pushed out of the receiving grooves. Since both the unlocking components and the hooks are integrated on the main frame body, there is no need to set unlocking components on the top cover or bottom shell, reducing the number of connecting parts, helping to save production costs and improve production efficiency. The paper feed side of the main frame body is provided with upper and lower paper guide blocks, forming independent and complete upper and lower paper guide surfaces for the paper feeding channel, allowing the printhead, rubber rollers, and other components related to printing to move and unlock. The roller drive mechanism and paper feed path are all integrated into the main frame, reducing the problem of excessive cumulative errors caused by different installation benchmarks. This ensures the relative positional accuracy of the roller and printhead, guaranteeing stable print quality. It also decouples the mechanism from the outer casing, allowing the mechanism module to function as an independent printing unit without the need for a separate outer casing. Furthermore, the mechanism module can adapt to any casing shape, enabling customized appearance. Compared to the previous method of adjusting the paper feed path size by vertical displacement of the slide and paper limiter in the paper feed direction, this invention uses a telescopic hole to insert or remove the paper limiter to change the paper feed path size. This eliminates the need for a large lateral displacement space, reducing the footprint and allowing for a smaller main frame, further reducing the printer's size. This results in a higher degree of integration in the mechanism module, effectively saving space and achieving extreme compactness and portability. 2. The method of pushing the rubber roller with the printhead allows the user to unlock the hook by operating the unlocking mechanism. The pushing mechanism then pushes the rubber roller out of the receiving groove. After the user releases the unlocking mechanism, the hook can no longer hold the rubber roller, eliminating the need to operate the unlocking mechanism with one hand and pick up the rubber roller with the other, making operation simpler and more convenient. 3. Pressing the pressing section on the hook drives it to rotate away from the receiving groove, allowing the rubber roller to be removed. The pressing section protrudes from the hook and is located away from the hinge point, making it easier to rotate the hook by extending the lever. The pressing part also increases the contact area with the user's fingers, reducing pressure and making operation more comfortable. The contact surface between the main frame and the hook has a first rib or groove, which reduces the contact area and friction, making pressing and resetting the hook smoother. 4. The first positioning part and the second positioning part are designed to fix the paper limiter in a designated position, that is, to fix the paper limiter after it is inserted into the paper feeding channel, and to fix the paper limiter after it is removed from the paper feeding channel, so as to avoid interfering with the paper feeding.5. The second positioning part of the paper limiting piece is a first elastic arm, and the first positioning part of the telescopic hole is a second slot, so that the first elastic arm can deform and disengage from the second slot after being subjected to external force, and can also be inserted into the second slot after moving, to achieve the positioning function. 6. The second protruding rib and the second groove on the back together constitute the first elastic arm, so that the part of the paper limiting piece inserted into the telescopic hole can undergo elastic deformation. 7. The first positioning part includes multiple second slots, which are arranged symmetrically, so that the paper limiting piece does not need to distinguish the direction when in use, and can be limited and stopped by inserting it into the telescopic hole from either side. 8. The original method of fixing the sensor with screws or glue has been changed to a planar limiting method where the positioning groove and the side of the sensor cooperate. The elastic element cooperates with the third positioning part and the end face of the positioning groove to achieve a perpendicular limiting method. The elastic force of the elastic element presses the third positioning part against the end face of the positioning groove, thereby achieving six degrees of freedom limiting of the sensor and fixing the sensor. Compared with screw fastening, which only requires placing the sensor in the positioning groove and placing the elastic element, the assembly process is greatly simplified, the efficiency is significantly improved, and the problem of falling off due to excessive temperature after applying glue is avoided. The elastic element is a spring sheet. The deformation of the spring sheet can be placed between the sensor and the top. After deformation, the restoring force acts on the top and the sensor, which can hold the sensor in the positioning groove. Moreover, the production of the spring sheet is easier and simpler, which helps to reduce production costs and improve production efficiency. The M-shaped, C-shaped, Z-shaped and U-shaped spring sheet is easy to compress, making it easy to put into the space between the sensor and the top. After the compression force is removed, it can reset and hold the sensor. 9. The printer of this utility model also features partially hollowed-out button positions on the outer shell. During the shell molding process, the pressing body of the hollowed-out portion is connected to the inner wall of the hollowed-out portion via a second elastic arm, forming an integral part with the shell. The elastic arm provides a restoring force and connection limit. Utilizing a portion of the shell to form elastic buttons results in higher positioning accuracy without excessive free wobbling, reduces the number of parts, saves material and assembly costs, helps improve production efficiency, and eliminates the need for separate molds for the buttons, further reducing production costs. 10. The pressing body and the second elastic arm divide the space within the hollowed-out portion into a spiral. This structure increases the length of the second elastic arm, allowing the pressing body to have a greater stroke for a better pressing feel. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the structure of an existing printer.

[0016] Figure 2 is a schematic diagram of the positional relationship of the paper feed path in an existing printer.

[0017] Figure 3 is a schematic diagram of the components of the printer mechanism module of this utility model.

[0018] Figure 4 is a three-dimensional structural diagram of the printer mechanism module of this utility model.

[0019] Figure 5 is a three-dimensional structural schematic diagram of the printer mechanism module of this utility model from another perspective.

[0020] Figure 6 is a cross-sectional structural diagram of the printer mechanism module of this utility model installed in the outer casing.

[0021] Figure 7 is a cross-sectional structural diagram of the first hook of the printer mechanism module of this utility model.

[0022] Figure 8 is a cross-sectional structural diagram of the limiting protrusion part of the printer mechanism module of this utility model.

[0023] Figure 9 is a schematic diagram of the structure of the quick-release rubber roller of this utility model after installation.

[0024] Figure 10 is a three-dimensional schematic diagram of the quick-release mechanism for rubber rollers of this utility model, showing the rubber roller placed on the V-shaped guide surface.

[0025] Figure 11 is a schematic diagram of the components of the quick-release mechanism for rubber rollers of this utility model after the rubber rollers have been removed.

[0026] Figure 12 is a schematic diagram of the rubber roller in the installed position of the quick-release mechanism of the rubber roller of this utility model.

[0027] Figure 13A is a schematic diagram of the quick-release mechanism for rubber rollers of this utility model in the state of not having the rubber roller installed.

[0028] Figure 13B is a side view of the rubber roller of the quick-release mechanism of this utility model placed on the V-shaped guide surface.

[0029] Figure 14 is a schematic diagram of the components of the paper limiter adjustment mechanism of this utility model.

[0030] Figure 15A is a schematic diagram of the three-dimensional structure of the paper sheet.

[0031] In Figure 15, B is the front view of the paper sheet.

[0032] Figure 16 is a partially enlarged schematic diagram of the paper sheet being inserted into the telescopic hole.

[0033] Figure 17A is a partially enlarged schematic diagram of the paper path at its maximum width.

[0034] Figure 17B is a magnified schematic diagram of the paper path when it is in a narrow width state.

[0035] Figure 18 is a schematic diagram of the sensor after the main support uses a C-shaped spring to fix it.

[0036] Figure 19A is a schematic diagram of the cross-sectional state before the sensor is aligned and installed.

[0037] Figure 19B is a schematic diagram of the cross-sectional state after the sensor is aligned and installed, and before the C-shaped spring is aligned and installed.

[0038] In Figure 19, C is a schematic diagram of the cross-sectional state after the C-shaped spring is aligned and inserted.

[0039] Figure 20A shows the state before the sensor is fixed with an M-shaped spring.

[0040] Figure 20B is a schematic diagram of the sensor after it is fixed with an M-shaped spring.

[0041] Figure 21 is a schematic diagram of the external structure of the printer of this utility model, in which the housing and the faceplate are separate.

[0042] Figure 22 is a schematic diagram of the external structure of the printer housing of this utility model with an integrated button.

[0043] Figure 23A is a schematic cross-sectional view of the shell and the surface covering being separate.

[0044] Figure 23B is a schematic diagram of the cross-sectional structure after the shell and the surface are bonded together.

[0045] Figure 24 is a schematic diagram of the three-dimensional structure after the faceplate is removed.

[0046] 1. Main frame body; 11. Paper feed channel; 111. Upper paper guide surface; 112. Lower paper guide surface; 113. Paper feed side; 114. Paper output side; 12. Positioning groove; 13. Speaker groove; 14. Top abutment; 15. Elastic element; 16. Limiting part;

[0047] 2. Print head; 21. Print head body; 22. Push spring; 23. Limiting protrusion; 24. Limiting block; 25. First hook; 26. Second hook;

[0048] 3. Rubber roller drive mechanism;

[0049] 4. Rubber roller; 41. Bushing;

[0050] 5. Quick-release mechanism for rubber roller; 51. Receiving groove; 52. Guide limiting groove; 53. First protruding rib; 54. Hook connector; 541. First slot; 55. Reset component; 56. Pressing section; 561. Pressing part; 57. V-shaped guide surface; 58. Rubber roller mounting plate;

[0051] 6. Paper limiter adjustment mechanism; 61. Telescopic hole; 611. First positioning part; 62. Paper limiter plate; 621. Second rib; 622. Second groove; 623. Pressing plate;

[0052] 7. Sensor; 71. Third positioning unit;

[0053] 8. Housing; 81. Button position; 82. Gap; 83. Light-transmitting hole; 84. Pressing body; 85. Protrusion; 86. Second elastic arm; 861. First transition part; 862. Second transition part; 87. Surface sticker;

[0054] 9. Circuit board; 91. Switch; 10. Battery. Detailed Implementation

[0055] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0056] Please refer to Figures 3 to 24. A highly integrated printer core module includes a main frame body 1, a circuit board 9, and a battery 10, as well as a printhead 2 and a rubber roller drive mechanism 3 disposed on the main frame body 1. The main frame body 1 is provided with a paper feeding channel 11. On the paper feeding side of the main frame body 1, there are upper paper guide blocks and lower paper guide blocks, both integrally formed with the main frame body 1. The lower surface of the upper paper guide block forms an upper paper guide surface 111, and the upper surface of the lower paper guide block forms a lower paper guide surface 112. The main frame body 1 has a battery compartment for installing the battery 10. The circuit board 9 is mounted on the main frame body 1. The main frame body 1 is also provided with a quick-release mechanism for the rubber roller 4 and a paper limiter adjustment mechanism 6. The quick-release mechanism for the rubber roller 4 includes accommodating openings on both sides of the main frame body 1. The main frame body 1 has a movable hook 54 on its main frame body 1 at a position opposite to the receiving groove 51. The hook 54 has an unlocking component located on the side of the main frame body 1 facing the upper cover. A reset component is also provided between the hook 54 and the main frame body 1. When the rubber roller 4 is inserted into the receiving groove 51, the print head 2 abuts against the rubber roller 4. The paper limiter adjustment mechanism 6 includes a telescopic hole 61 on the main frame body 1 that can communicate with the paper feeding channel 11. The paper limiter 62 can be movably installed in the telescopic hole 61. When the paper limiter 62 extends into the paper feeding channel 11, the paper feeding channel 11 is partially blocked. When the paper limiter 62 is fully or partially retracted into the telescopic hole 61, the paper feeding channel 11 is released from paper limitation.By directly setting receiving grooves 51 for mounting the rubber roller 4 on both sides of the main frame body 1, the rubber roller 4 can be directly placed on the main frame body 1 without first installing the rubber roller 4 on the top cover. An unlocking component is directly set on the hook 54 to drive the hook 54 to move and unlock. The print head 2 is also installed in the main frame body 1 to push the rubber roller 4. After the unlocking component drives the hook 54 to unlock, the rubber roller 4 can be pushed out of the receiving groove 51. Since both the unlocking component and the hook 54 are integrated on the main frame body 1, there is no need to set unlocking components on the top cover or bottom shell, reducing connecting parts, saving production costs, and improving production efficiency. The paper feed side of the main frame body is provided with upper and lower paper guide blocks, forming independent and complete upper and lower paper guide surfaces for the paper feeding channel. This allows all printing-related components such as the print head, rubber roller 4, rubber roller drive mechanism 3, paper feeding channel 11, battery 10, and circuit board 9 to be integrated on the main frame body, making the machine core module... It can function as an independent printing unit, printing without the need for a casing; it also reduces the problem of excessive cumulative errors caused by different installation benchmarks, thereby ensuring the relative positional accuracy of the roller 4 and the print head 2, ensuring stable print quality, higher integration, and helping to reduce the overall size for greater portability; it achieves decoupling of the mechanism and the casing, allowing the mechanism to adapt to casings of any shape, enabling customized appearance; compared to the original method of adjusting the size of the paper feeding channel 11 by vertical displacement of the slide and paper limiter 62 in the paper feeding direction, this utility model uses the method of changing the size of the paper feeding channel 11 by inserting or removing the paper limiter 62 through the telescopic hole 61, which does not require a large lateral displacement space, thus reducing the space occupied, which is beneficial for reducing the size of the main frame body 1, thereby further reducing the size of the printer, making the mechanism module more integrated and effectively saving space, achieving extreme compactness and portability.

[0057] Please refer to Figures 3 to 24. Preferably, the battery compartment is located at the bottom of the main frame body 1. The battery 10 is arranged parallel to the motor of the roller drive mechanism 3, using the space left after the original motor was installed (higher space utilization, which helps to achieve extreme compactness and portability). The battery powers the circuit board, roller drive mechanism, print head, etc. The print head, battery, circuit board, and roller drive mechanism are all mature existing technologies. The circuit board 9 is fixed at the opening end of the battery 10 compartment of the main frame body 1, forming a box-shaped structure with the main frame body 1 as a whole, which has higher stability.

[0058] Please refer to Figures 3 to 11, 17 to 20, and 23. Preferably, the printhead 2 includes a printhead 2 body and a push spring 22. The push spring 22 is installed between the printhead 2 body and the main frame body 1 and is used to push the printhead 2 body towards the rubber roller 4. The hook 54 is hinged to the side of the main frame body 1 and can swing from one side of the receiving groove 51 to the other side. Alternatively, the hook 54 is movably installed on the side of the main frame body 1 and can move from one side of the receiving groove 51 to the other side.

[0059] Please refer to Figures 3 to 11, 17 to 20, and 23. Preferably, the main frame body 1 is provided with a printhead 2 mounting part, which is located on the main frame body 1 between the receiving grooves 51. The two ends of the printhead 2 mounting part are provided with limiting protrusions 23, and the two sides of the main frame body 1 are provided with limiting parts 16 that cooperate with the corresponding limiting protrusions 23. The bottom surface of the printhead 2 mounting part is provided with a spring pushing groove. One end of the pushing spring 22 is fixed to the lower surface of the printhead 2 body, and the other end of the pushing spring 22 abuts against the corresponding spring pushing groove. The bottom surface of the printhead 2 mounting part is provided with a limiting block 24, avoiding the spring push groove. The lower surface of the printhead 2 body is provided with a first hook 25 and a second hook 26 on the paper feed side 113 and paper output side 114 in the paper feed direction of the paper feed channel 11, respectively. The first hook 25 is hooked and limited to the side of the limiting block 24 facing the paper output side 114, and the second hook 26 is hooked and limited to the side of the limiting block 24 facing the paper feed side 113. The longitudinal dimension of the first hook 25 is larger than that of the second hook 26. The size and limiting protrusion 23 are located on the rear side of both ends of the printhead 2 body; since the longitudinal dimension of the first hook 25 is larger, the printhead 2 body facing the paper output side 114 can have a larger stroke. When the rubber roller 4 is not installed, one end of the printhead 2 body facing the paper output side 114 can move upward a greater distance. This ensures that the position of the upper surface of the printhead 2 body near the paper output side 114 can press against the rubber roller 4 after the rubber roller 4 is installed; after the unlocking part is pressed to unlock, the rubber roller 4 can be pushed upward.

[0060] Please refer to Figures 3 to 5 and Figures 9 to 13. Preferably, the hook member 54 is hinged to the main frame body 1, and the unlocking member is a pressing section 56 provided on the hook member 54. The pressing section 56 is provided on a section of the hook member 54 away from the hinge point and away from the receiving groove 51. Pressing the pressing section 56 on the hook member 54 can drive the hook member 54 to rotate away from the receiving groove 51 to make room, and the rubber roller 4 can be removed from the receiving groove 51.

[0061] Please refer to Figures 3 to 5 and Figures 9 to 13. Preferably, the pressing section 56 protrudes from the hook member 54 away from the hinge point and is provided with a bent pressing part 561 facing outward from the main frame body 1. The pressing section 56 protrudes from the hook member 54 and is away from the hinge point, making it easier to drive the hook member 54 to rotate by extending the lever. It also has a pressing part 561, which increases the contact area with the user's fingers, reduces pressure, and makes the user's operation more comfortable.

[0062] Please refer to Figures 3 to 5 and Figures 9 to 13. Preferably, the side surface of the main frame body 1 that contacts the corresponding hook member 54 is provided with a first protruding rib 53 or a first groove; or, the surface of the hook member 54 that contacts the side surface of the main frame body 1 is provided with a first protruding rib 53 or a first groove. The presence of a first protruding rib 53 or a first groove on the contact surface between the main frame body 1 and the hook member 54 reduces the contact area between them, effectively reducing the frictional force of the hook member 54 and making the pressing and resetting of the hook member 54 smoother.

[0063] Please refer to Figures 3 to 5 and Figures 9 to 13. Preferably, the hook 54 is a latch, and the side of the latch facing the receiving groove 51 has a first slot 541. The first slot 541 can penetrate into the receiving groove 51 and block the opening end of the receiving groove 51. The receiving groove 51 is U-shaped, which limits the vertical downward direction of the rubber roller 4 in the horizontal direction. The upper end of the first slot 541 of the latch blocks the opening side of the receiving groove 51, limiting the vertical upward direction of the rubber roller 4, thus clamping the rubber roller 4 in the receiving groove 51.

[0064] Please refer to Figures 3 to 5 and Figures 9 to 13. Preferably, the first slot 541 is C-shaped, with its opening located at the lower part of the side of the hook facing the receiving groove 51. The upper part of the receiving groove 51, away from the hook, expands outward. The upper surface of the hook facing the receiving groove 51, in its reset state, together with the side of the receiving groove 51 away from the hook, forms a V-shaped guide surface 57. Guide limiting grooves 52 are provided on both sides of the main frame body 1, adjacent to the receiving groove 51. The hook member 54 is installed in the guide limiting groove 52. The inner end face of the guide limiting groove 52 is provided with the first protruding rib 53 or the first groove. When the guide limiting groove 52 approaches the receiving groove 51 and abuts against the hook member 54, the hook member 54 is in a state where it can hook the rubber roller 4. Preferably, the torsion spring mounting groove is opened inward from the inner end face of the guide limiting groove 52. When the rubber roller 4 is disassembled, the hook will be reset and locked in place, ensuring that the surface of the hook facing the receiving groove 51 and the side of the receiving groove 51 form a V-shaped groove (V-shaped guide surface 57) when the rubber roller 4 is about to be inserted. When the rubber roller 4 is inserted, the bushings 41 at both ends are aligned with the V-shaped grooves respectively. Pressing down on the rubber roller 4 will push the hooks at both ends to move backward around the hinge point, so that the rubber roller 4 can be quickly inserted into the positioning groove 12.

[0065] Please refer to Figures 3 to 5 and Figures 9 to 13. Preferably, when the hook member 54 is hinged to the main frame body 1, the reset member 55 is a torsion spring. The main frame body 1 has torsion spring mounting grooves on both sides, which are adjacent to the receiving groove 51. The torsion spring is located in the torsion spring mounting groove, with one end connected to the hook member 54 and the other end abutting against the end face of the torsion spring mounting groove away from the receiving groove 51. When the hook member 54 is slidably connected to the main frame body 1, the reset member 55 is a reset spring. The main frame body 1 has a spring mounting groove, which is adjacent to the receiving groove 51. The reset spring is located in the spring mounting groove, with one end of the reset spring facing the receiving groove 51 abutting against the hook member 54 and the other end of the reset spring away from the receiving groove 51 abutting against the end face of the spring mounting groove away from the receiving groove 51. The reset member 55 is used to drive the hook to reset to a position that can block the opening of the receiving groove 51, thereby forming a V-shaped groove for guiding into place, and then hooking the rubber roller 4 through the first slot 541 after making room. Preferably, this embodiment uses a torsion spring.

[0066] Please refer to Figures 3 to 5 and Figures 9 to 13. Preferably, a rubber roller mounting plate 58 is fixed to the outer surface of both sides of the main frame body 1. The rubber roller mounting plate 58 has a U-shaped groove at the position opposite to the receiving groove 51, and the U-shaped groove accommodates the shaft end of the rubber roller 4. The opening ends of the receiving groove 51 and the U-shaped groove face the upper cover. The hook member 54 is clamped between the rubber roller mounting plate 58 and the side of the main frame body 1. The shaft end of the rubber roller 4 is also fitted with a bushing 41 to ensure that the rubber roller 4 can still rotate smoothly after being installed.

[0067] Please refer to Figures 3 to 7. The telescopic hole 61 is opened in the upper paper guide block and the lower paper guide block.

[0068] Please refer to Figures 3 to 5 and Figures 14 to 17. Preferably, the telescopic hole 61 has one or more first positioning parts 611, and the paper limiting piece 62 has a cooperating second positioning part for fixing the paper limiting piece 62 in a designated position. The provision of the first positioning part 611 and the second positioning part facilitates fixing the paper limiting piece 62 in a designated position, that is, fixing the paper limiting piece 62 after it is inserted into the paper feeding channel 11, and fixing the paper limiting piece 62 after it is removed from the paper feeding channel 11, thus avoiding interference with paper feeding.

[0069] Please refer to Figures 3 to 5 and Figures 14 to 17. Preferably, the second positioning part is a first elastic arm provided on the side of the limiting paper sheet 62, and the first positioning part 611 is a second slot provided on the inner wall of the telescopic hole 61. The first elastic arm can elastically deform and be inserted into the second slot. The first elastic arm is composed of a second protruding rib 621 provided on one side surface of the limiting paper sheet 62 and a second groove 622 provided on the other side surface opposite to the second protruding rib 621.

[0070] Please refer to Figures 3 to 5 and Figures 14 to 17. Preferably, there are two or more second protruding ribs 621 and second grooves 622. Having two or more second protruding ribs 621 or second grooves 622 means having two elastic deformation parts, enabling positioning at two positions: positioning and releasing the paper limit. Alternatively, the telescopic hole 61 can have two longitudinal slots, with only one elastic arm.

[0071] Please refer to Figures 3 to 5 and Figures 14 to 17. Preferably, the first positioning part 611 includes a plurality of second slots. The cross-section of the telescopic hole 61 is rectangular. The second slots are formed on two opposite surfaces of the telescopic hole 61, and the second slots on the opposite surfaces are symmetrically arranged. The first positioning part 611 includes a plurality of second slots, which are symmetrically arranged so that the paper sheet 62 does not need to distinguish the direction when used, and can be stopped by inserting it into the telescopic hole 61 from both sides. Preferably, two second slots are spaced apart in the longitudinal direction on each surface.

[0072] Please refer to Figures 3 to 5 and Figures 14 to 17. Preferably, the end of the paper limiting piece 62 facing away from the paper feeding channel 11 is provided with a pressing piece 623; the upper end of the paper limiting piece 62 is provided with a pressing piece 623, which facilitates user operation and also prevents the paper limiting piece 62 from falling completely into the telescopic hole 61 and being unable to be pulled out.

[0073] Please refer to Figures 3 to 5 and Figures 14 to 17. The paper feed channel 11 is centered for paper feeding, and two telescopic holes 61 are provided, symmetrically arranged along the center line of the paper feed channel 11, as shown in Figures 3 to 5 and 14. Alternatively, the paper feed channel 11 is aligned on one side for paper feeding, and one telescopic hole 61 is provided, spaced apart from the aligned side of the paper feed channel 11. The installation positions of the telescopic and paper limiting plates 62 can be flexibly adjusted according to the printer's paper feed alignment position to adapt to product requirements. Of course, more telescopic holes 61 and paper limiting plates 62 can be provided depending on the type and quantity of applicable paper materials to accommodate a wider range of paper types.

[0074] Please refer to Figures 3 to 5 and Figures 14 to 17. Preferably, the telescopic hole 61 consists of two sections: one section is located on the upper side of the paper feeding channel 11, and the other section is located on the lower side of the paper feeding channel 11. The paper limiting piece 62 is inserted through the upper section of the paper feeding channel 11, and the first positioning part 611 is located in the upper section of the paper feeding channel 11. The telescopic hole 61 penetrates the upper and lower surfaces of the paper feeding channel 11. In this way, when the two ends of the paper limiting piece 62 are located at the upper and lower sections of the telescopic hole 61 respectively, the paper limiting piece 62 can have better force support and avoid excessive deformation during paper limiting.

[0075] Please refer to Figures 3 to 5 and Figures 18 to 20. Preferably, the main frame body 1 has a positioning groove 12 on the bottom or top surface of the inlet and / or outlet end of the paper feeding channel 11. A sensor 7 is installed in the positioning groove 12, and a third positioning part 71 is provided on the sensor 7. The cross-sectional dimension of the third positioning part 71 is larger than that of the positioning groove 12. A top abutment 14 is provided in the main frame body at a position opposite to the positioning groove 12. An elastic element 15 is provided between the top abutment 14 and the sensor 7. When the elastic element 15 is located between the top abutment 14 and the sensor 7, it undergoes elastic deformation. The original method of fixing the sensor 7 with screws or glue has been changed to a planar limiting method achieved by the cooperation of the positioning groove 12 and the side of the sensor 7. The elastic element 15 cooperates with the end face of the third positioning part 71 and the positioning groove 12 to achieve a perpendicular limiting method. The elastic force of the elastic element 15 presses the third positioning part 71 against the end face of the positioning groove 12, thereby achieving six degrees of freedom limiting of the sensor 7 and fixing the sensor 7. Compared with screw fastening, which only requires placing the sensor 7 into the positioning groove 12 and placing the elastic element 15, the assembly process is greatly simplified, the efficiency is significantly improved, and the situation of falling off due to excessive temperature after applying glue is avoided. Preferably, in this embodiment, the inlet and outlet ends of the paper feeding channel 11 are provided with positioning grooves 12 to install the sensor 7. The sensor 7 detecting the paper feeding and exiting is a mature existing technology and is not specifically protected. The installation structure of the sensor 7 on the main frame body 1 is the subject of this utility model.

[0076] Please refer to Figures 3 to 5 and Figures 18 to 20. Preferably, the elastic element 15 is a spring sheet. When the elastic element 15 is a spring sheet, the deformation of the spring sheet can be placed between the sensor 7 and the abutment 14. After deformation, the restoring force acts on the abutment 14 and the sensor 7, which can hold the sensor 7 in the positioning groove 12. Moreover, the production of the spring sheet is easier and simpler, which helps to reduce production costs and improve production efficiency.

[0077] Please refer to Figures 3 to 5 and Figures 18 to 20. Preferably, the spring is M-shaped, C-shaped, Z-shaped, or U-shaped. The M-shaped, C-shaped, Z-shaped, and U-shaped springs are all easily compressed, making it easy to insert into the space between the sensor 7 and the abutment 14. After the compressive force is removed, the abutment sensor 7 can be reset.

[0078] Please refer to Figures 3 to 5 and Figures 18 to 20. Preferably, the positioning groove 12 has a horn groove 13 at the end facing the abutment 14, and the cross-sectional dimension of the horn groove 13 gradually increases from the end facing the positioning groove 12 to the end away from it. The horn groove 13 serves to guide the detection part of the sensor 7 into the positioning groove 12, reducing assembly difficulty.

[0079] Please refer to Figures 3 to 5 and Figures 18 to 20. Preferably, the size of the largest cross-sectional area of ​​the horn groove 13 is smaller than the cross-sectional size of the third positioning part 71. This facilitates the arrangement of the appropriate number of sensors 7 according to the needs of the product.

[0080] Please refer to Figures 3 to 5 and Figures 18 to 20. Preferably, the third positioning part 71 is the FPC circuit board to which the sensor 7 is connected. By using the circuit board of the sensor 7 as the third positioning part, it is not necessary to design a separate third positioning part 71, which can effectively reduce production costs.

[0081] Please refer to Figures 3 to 5 and Figures 18 to 20. Preferably, there is one or more sensors 7, and there are multiple corresponding positioning slots 12 and spring pieces. The main frame body and each positioning slot 12 are provided with a top abutment 14 at their respective positions.

[0082] Please refer to Figures 3 to 5 and Figures 18 to 20. Preferably, the abutment top 14 is an abutment groove located on the main frame body opposite to the positioning groove 12. The abutment top 14 being an abutment groove provides a positioning function for the installation of the spring piece, facilitating quick alignment and installation.

[0083] This embodiment has the following working principle:

[0084] During assembly, first align the detection part of sensor 7 with the horn groove 13 of the main frame body 1 and insert it (as shown in Figure 19A). Then, place the spring piece next to the sensor 7 and the abutment groove (as shown in Figure 19B and Figure 20A). Then, push the spring piece to deform it and squeeze it into the position between the sensor 7 and the abutment groove. The restoring force of the spring piece acts on the circuit board 9 of sensor 7, so that the circuit board 9 completely abuts against the plane where the end face of the horn groove 13 is located, thus completing the connection and fixation between sensor 7 and the main frame body (as shown in Figure 18, Figure 19C, and Figure 20B).

[0085] When installing the rubber roller 4, align the bushings 41 at both ends of the rubber roller 4 with the V-shaped groove (V-shaped guide surface 57) formed by the inclined surface of the hook and the side edges of the left and right receiving grooves 51 (as shown in Figures 10 and 13B). At the same time, press down on the left and right ends of the rubber roller 4. After the inclined surface of the left and right hooks is subjected to force, it will move backward around the hinge point to make room. The bushings 41 on the left and right sides of the rubber roller 4 will enter the groove along the inclined surface of the V-shaped groove. They will lose the force of the rubber roller 4. The left and right hooks will automatically reset under the drive of the torsion spring. The groove will re-enter the receiving groove 51, restricting the upper part of the left and right bushings 41, thereby clamping the rubber roller 4 (as shown in Figures 9 and 12).

[0086] When it is necessary to disassemble the rubber roller 4, when the rubber roller 4 is in the locked state, press the pressing part 561 on both sides of the hook at the same time. The hook swings away from the receiving groove 51. At this time, the first groove 541 of the hook leaves the opening end of the receiving groove 51 and no longer blocks the exit path of the rubber roller 4. The rubber roller 4 will be automatically popped to the starting installation position of the rubber roller 4 (i.e. the opening of the receiving groove 51) by the upward pre-pressure transmitted by the push spring 22 through the push plate. The rubber roller 4 can then be removed. After the rubber roller 4 is removed, release the pressing part 561. The reset part 55 (torsion spring) will push the hook to reset so that the second groove of the hook re-enters the receiving groove 51. The upper side of the receiving groove 51 forms an opening space with the lower surface and side of the receiving groove 51. At this time, the surface of the hook above the groove facing the receiving groove 51 will form a V-shaped groove with the side of the receiving groove 51 further away from the hook (as shown in Figure 13).

[0087] Taking the adaptation to two sizes of paper as an example, when it is necessary to adapt to the largest size of paper, the paper limiting piece 62 is pushed outward towards the telescopic hole 61, so that the paper feeding width of the paper feeding channel 11 is at its maximum. At this time, the first elastic arm at the top of the paper limiting piece 62 cooperates with the second slot at the top of the telescopic hole 61 (as shown in Figure 17A). When it is necessary to adapt to the feeding of small-sized paper, the pressing piece 623 pushes the paper limiting piece 62 into the paper feeding channel 11. During the pushing process, the first elastic arm deforms. When the first elastic arm at the top of the paper limiting piece 62 moves down a certain distance and gets into the second slot at the bottom, it means that the paper limiting piece 62 is pressed in place, so that the paper feeding piece blocks part of the paper feeding channel 11. At this time, the paper feeding width of the paper feeding channel 11 is the width of the small-sized paper (as shown in Figure 17B).

[0088] Please refer to Figures 21 to 24. Another printer is provided, including a housing. The housing contains a highly integrated printer core module as described above. The housing 8 has a button position 81, which is partially hollowed out. The hollowed-out portion of the button position 81 has a pressing body 84 and a second elastic arm 86. One end of the second elastic arm 86 is connected to the pressing body 84, and the other end is connected to the inner wall of the hollowed-out portion of the button position 81. A gap 82 exists between the pressing body 84 and the inner wall of the hollowed-out portion of the button position 81. The pressing body and the second elastic arm 86 are integrally formed, and the second elastic arm 86 is integrally formed with the housing 8. By creating partially hollowed-out button positions 81 on the outer shell 8, the hollowed-out pressing body 84 is connected to the inner wall of the hollowed-out portion via a second elastic arm 86 during the outer shell molding process, forming an integral part with the shell 8. The elastic arm provides a restoring force and connection limit. Utilizing a portion of the shell 8 to form an elastic button results in higher positioning accuracy without excessive free wobbling, reduces the number of parts, saves material and assembly costs, helps improve production efficiency, and eliminates the need for a separate mold for the button, further reducing production costs. The printer's outer shell can be made into any shape, as long as the internal space remains the same, allowing the core module to be adapted to shells of different appearances.

[0089] Please refer to Figures 21 to 24. Preferably, the side of the non-connecting end of the second elastic arm 86 has a gap 82 with the inner wall of the hollowed-out portion of the button position 81, and a gap 82 with the side of the pressing body 84. The gap 82 between the non-connecting end of the second elastic arm 86 and the inner wall of the hollowed-out portion of the pressing body 84 and the button position 81 allows the second elastic arm 86 to deform and displace relative to the housing 8, thereby enabling the pressing body 84 connected to it to move and trigger the switch 91 inside the housing 8.

[0090] Please refer to Figures 21 to 24. The pressing body 84 and the second elastic arm 86 divide the gap 82 of the hollowed-out portion of the button position 81 into a spiral shape. The pressing body 84 and the second elastic arm 86 divide the space within the hollowed-out portion into a spiral. This structure increases the length of the second elastic arm 86, allowing the pressing body 84 to have a greater stroke and obtain a better pressing feel.

[0091] Referring to Figures 21 to 24, preferably, a first transition portion 861 is provided at the connection between the second elastic arm 86 and the inner wall of the hollowed-out portion of the button position 81, and a second transition portion 862 is provided at the connection between the second elastic arm 86 and the pressing body 84. Providing transition portions at the connection ends of the second elastic arm 86 with the pressing body 84 and the inner wall of the hollowed-out portion allows the elastic arm to have greater deformation capacity. The first transition portion 861 gradually decreases in thickness from the end in contact with the inner wall of the hollowed-out portion of the button position 81 towards the end away; the second transition portion 862 gradually decreases in thickness from the end in contact with the pressing body 84 towards the end away. Both transition portions are designed to gradually thin away from the connection end, that is, to reduce the thickness of the portion between the two transition portions of the elastic arm, thus making it easier to deform under external force and providing a better tactile feel.

[0092] Please refer to Figures 21 to 24. Preferably, the surface of the pressing body 84 facing outward from the housing 8 has a protrusion 85. The surface of the pressing body 84 has a partial protrusion, which makes it easier for the button to touch the motherboard surface-mount switch 91 inside the housing 8, that is, it allows the pressing body 84 to be pressed into the housing 8 a longer distance.

[0093] Please refer to Figures 21 to 24. Preferably, the surface of the button position 81 of the housing 8 facing outwards is covered with a faceplate 87. Providing the faceplate 87 to the button position 81 serves two purposes: firstly, it prevents foreign objects from entering the button position 81; secondly, it limits the pressing stroke and protects the elastic arm.

[0094] Please refer to Figures 21 to 24. Preferably, the button position 81 has a light-transmitting hole 83 avoiding the hollowed-out portion; the position of the faceplate 87 opposite to the light-transmitting hole 83 is made of light-transmitting material, and the position of the faceplate 87 opposite to the pressing body 84 has a protrusion facing away from the housing 8. The light-transmitting hole 83 allows the light of the signal indicator light of the circuit board 9 in the housing 8 to pass through, and the corresponding position on the faceplate 87 is made of light-transmitting material to avoid blocking the light; the faceplate 87 has a local protrusion on the pressing body 84, making the pressing body 84 easier to press.

[0095] This embodiment has the following working principle:

[0096] The assembled mechanism module is completely installed into the housing 8 of the outer shell, and the switch 91 of the circuit board 9 is aligned with the pressing body 84 on the housing 8 to complete the assembly of the whole machine. When needed, the finger presses the protruding part of the faceplate 87 (i.e. the protruding part of the pressing body 84) to push the pressing body 84 into the housing 8. The second elastic arm 86 is deformed by the force transmitted by the pressing body 84 until the pressing body 84 stops pressing the switch 91 inside. The finger is released from the contact with the faceplate 87, and the restoring force of the second elastic arm 86 drives the second elastic arm 86 to return to its initial shape, thereby driving the pressing body 84 away from the switch 91 inside the housing body to reset to its initial position. The printer starts, the paper inserted into the paper feed side 113 of the paper feed channel 11 is moved by the rubber roller 4, the print head 2 starts printing, and the paper is output from the paper output side 114 of the paper feed channel 11.

[0097] Several points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0098] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0099] Finally, the above description is only a preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions that fall within the scope of the present utility model are protected by the present utility model.

[0100] It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this utility model should also be considered within the scope of protection of this utility model.

Claims

1. A highly integrated printer core module, comprising a main frame body, a battery and a circuit board, and a print head and a roller drive mechanism disposed on the main frame body, characterized in that: The main frame body integrates a paper feeding channel. On the paper feeding side of the paper feeding channel, the main frame body has an upper paper guide block and a lower paper guide block, both integrally formed with the main frame body. The lower surface of the upper paper guide block forms the upper paper guiding surface, and the upper surface of the lower paper guide block forms the lower paper guiding surface. The main frame body has a battery compartment for housing the battery, and the circuit board is mounted on the main frame body. The main frame body also has a quick-release mechanism for the rubber roller and a paper limiter adjustment mechanism. The quick-release mechanism for the rubber roller includes receiving slots with openings on both sides of the main frame body, and a corresponding receiving slot is provided on the main frame body. The device includes a movable hook with an unlocking mechanism located on the side of the main frame body facing the top cover. A reset mechanism is also provided between the hook and the main frame body. When the rubber roller is inserted into the receiving groove, the top of the print head abuts against the rubber roller. The paper limiter adjustment mechanism includes a telescopic hole on the main frame body that communicates with the paper feed channel. The paper limiter is movably installed in the telescopic hole. When the paper limiter extends into the paper feed channel, the paper feed channel is partially blocked. When the paper limiter is fully or partially retracted into the telescopic hole, the paper feed channel is released from the paper limiter.

2. The highly integrated printer core module according to claim 1, characterized in that: The printhead includes a printhead body and a push spring, which is installed between the printhead body and the main frame body to push the printhead body toward the rubber roller; the hook is hinged to the side of the main frame body and can swing from one side of the receiving groove to the other side; or, the hook is movably installed on the side of the main frame body and can move from one side of the receiving groove to the other side.

3. A highly integrated printer core module according to claim 2, characterized in that: The hook is hinged to the main frame body, and the unlocking member is a pressing section provided on the hook; the pressing section is located on a section of the hook away from the hinge point and away from the receiving groove; the pressing section protrudes from the section of the hook away from the hinge point and is provided with a bent pressing part facing outward of the main frame body; the side of the main frame body that contacts the corresponding hook is provided with a first rib or a first groove; or, the surface of the hook that contacts the side of the main frame body is provided with a first rib or a first groove.

4. A highly integrated printer core module according to claim 3, characterized in that: The hook is a latch, and a first slot is provided on the side of the latch facing the receiving groove. The first slot can penetrate into the receiving groove and block the opening end of the receiving groove. The first slot is C-shaped, and the opening of the first slot is located at the lower part of the side of the latch facing the receiving groove. The upper part of the receiving groove away from the latch expands outward. The upper surface of the latch facing the receiving groove, in the reset state, together with the side of the receiving groove away from the latch, forms a V-shaped guide surface. Both sides of the main frame body are provided with guide limiting grooves, which are adjacent to the receiving groove. The hook is installed in the guide limiting groove. The inner end face of the guide limiting groove is provided with the first protrusion or the first groove. When the guide limiting groove is close to the receiving groove and abuts against the hook, the hook is in a state where it can hook the rubber roller.

5. A highly integrated printer core module according to claim 1, characterized in that: The telescopic hole has one or more first positioning parts, and the paper limiting piece has a second positioning part that cooperates with it, for fixing the paper limiting piece in a designated position.

6. A highly integrated printer core module according to claim 5, characterized in that: The second positioning part is a first elastic arm provided on the side of the limiting paper sheet, and the first positioning part is a second slot provided on the inner wall of the telescopic hole. The first elastic arm can be elastically deformed and inserted into the second slot. The first elastic arm is composed of a second protruding rib provided on one side surface of the limiting paper sheet and a second groove provided on the other side surface opposite to the second protruding rib.

7. A highly integrated printer core module according to claim 6, characterized in that: The first positioning part includes a plurality of second slots. The cross-section of the telescopic hole is rectangular. The second slots are provided on two opposite surfaces of the telescopic hole and are symmetrically arranged on the two opposite surfaces. The end of the paper limiting sheet away from the paper feeding channel is provided with a pressing piece. The paper feeding channel feeds paper in the center. There are two telescopic holes, which are symmetrically arranged along the center line of the paper feeding channel. Alternatively, the paper feeding channel is aligned with one side, and there is one telescopic hole, which is spaced apart from the aligned side of the paper feeding channel.

8. A highly integrated printer core module according to claim 1, characterized in that: The main frame body has a positioning groove on the bottom or top surface at the inlet and / or outlet end of the paper feeding channel. A sensor is installed in the positioning groove, and the sensor has a third positioning part. The cross-sectional dimension of the third positioning part is larger than that of the positioning groove. A top is provided in the main frame body opposite to the positioning groove. An elastic element is provided between the top and the sensor. When the elastic element is located between the top and the sensor, it undergoes elastic deformation. The elastic element is a spring sheet. The spring sheet is M-shaped, C-shaped, Z-shaped, or U-shaped.

9. A printer, comprising a housing, characterized in that: The housing contains a highly integrated printer core module as described in any one of claims 1-8; the housing has a button position, the button position is partially hollowed out, the hollowed-out part of the button position has a pressing body and a second elastic arm, one end of the second elastic arm is connected to the pressing body, the other end of the second elastic arm is connected to the inner wall of the hollowed-out part of the button position, there is a gap between the pressing body and the inner wall of the hollowed-out part of the button position, the pressing body and the second elastic arm are integrally formed, and the second elastic arm is integrally formed with the housing.

10. A printer according to claim 9, characterized in that: The side of the non-connecting end of the second elastic arm has a gap with the inner wall of the key cutout portion and a gap with the side of the pressing body; the pressing body and the second elastic arm divide the gap of the key cutout portion into a spiral shape; a first transition portion is provided at the connection between the second elastic arm and the inner wall of the key cutout portion, and a second transition portion is provided at the connection between the second elastic arm and the pressing body; the thickness of the first transition portion gradually decreases from the end in contact with the inner wall of the key cutout portion to the end away from it; the thickness of the second transition portion gradually decreases from the end in contact with the pressing body to the end away from it.

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