Adjustable printer movement and printer

Abstract

The invention discloses an adjustable printer mechanism and a printer, comprising a base plate, a left chassis, a right chassis, a middle frame assembly and a flip cover assembly. The base plate is provided with a housing hole docking and locking mechanism for positioning and fixing the bottom surface of the right chassis, one end of a rotating shaft for facilitating the integrated assembly connection on the flip cover assembly is rotated and sleeved in the rotating shaft hole of the right chassis, and the other end of the rotating shaft corresponds to the left chassis and moves laterally along the length direction of the base plate, and then adaptively debugs and docks at the corresponding rotating shaft, and the bottom surface of the left chassis is positioned and fixed; a transmission meshing mechanism for adaptively docking the rubber roller is provided between the right chassis and the power receiving end of the rubber roller on the flip cover assembly; a printing self-positioning mechanism for adaptively adjusting and cooperating the rubber roller on the flip cover assembly with the print head on the middle frame assembly is provided between the flip cover assembly and the middle frame assembly. The above three mechanisms cooperate effectively to realize the adaptive docking assembly of the hinged rotating shaft and the print, effectively reduce the assembly accuracy of each movable structural component and improve the reliability of the product.

Description

Technical Field

[0001] The invention relates to the technical field of cover opening and closing, and in particular to an adjustable printer mechanism and a printer. Background Art

[0002] In the prior art, portable thermal transfer printers are widely used because of their simple operation, fast printing speed, lightweight design, and portability. They can be easily put into a backpack or handbag and used immediately on-site in various places such as study, office or travel, which is particularly helpful in improving the user's work efficiency.

[0003] However, portable thermal transfer printers also have their limitations, especially the existing portable A4 thermal transfer printers, where the integrated flip cover shaft cannot be installed. In order to facilitate assembly, the conventional practice is to make the shaft structure split for easy installation, that is, the flip cover shaft is usually set as a split shaft. The flip cover shaft adopts a split shaft matching structure. Due to the split layout design, the split shaft will inevitably lead to an increase in the number of parts and a decrease in assembly accuracy, and the strength of the split structure is also worse than that of the integrated structure. The assembly process has high requirements for assembly accuracy, resulting in high requirements for the dimensional design accuracy of each component, especially the movable structural parts, during the production process, which in turn leads to low assembly efficiency and high manufacturing costs.

[0004] In addition, the existing portable A4 thermal transfer printers require wider paper during the printing process, and most A4 portable thermal transfer printers are designed as narrow and long structures, which results in a narrow internal space. At the same time, many various parts need to be installed, and the corresponding components have more coordinated and connected activities. In addition, each component has shrinkage and deformation factors during the manufacturing injection molding process. Some uncontrollable factors cause the movable structural parts to fail to meet the design accuracy requirements, resulting in poor coordination accuracy of the components, and thus the reliability of the product cannot be effectively guaranteed. Summary of the invention

[0005] The present invention provides an adjustable printer mechanism and a printer, wherein a flap shaft adopts an integrated structure, and each movable structural member is limited in an adaptive matching manner, thereby effectively reducing the assembly accuracy requirements of each movable structural member, and the assembly width of the chassis can be adjusted according to different tolerances of the flap to adapt to different dimensional accuracy requirements, so that the flap shaft is easy to install, and the reliability of the product is effectively improved.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is:

[0007] An adjustable printer mechanism, used for adaptive docking assembly of hinged shaft and printing, comprising a base plate, a left chassis, a right chassis, a middle frame assembly and a flip cover assembly, wherein the left chassis and the right chassis are respectively installed at two ends of the base plate, and the middle frame assembly is located between the left chassis and the right chassis, and the bottom end is installed against the base plate;

[0008] The base plate is provided with a case hole docking and locking mechanism for positioning and fixing the bottom surface of the right chassis, so that one end of the rotating shaft connected to the flip cover assembly can be rotated and sleeved into the rotating shaft hole of the right chassis, and the other end of the rotating shaft can be adaptively debugged and docked at the corresponding rotating shaft after the left chassis is horizontally moved along the length direction of the base plate, and the bottom surface of the left chassis is positioned and fixed;

[0009] A transmission engagement mechanism for adaptive docking of the rubber roller is provided between the right chassis and the power receiving end of the rubber roller on the flip cover assembly;

[0010] A printing self-positioning mechanism is arranged between the flip cover assembly and the middle frame assembly to facilitate adaptive adjustment and cooperation between the rubber roller on the flip cover assembly and the print head on the middle frame assembly when the two are buckled and docked.

[0011] Preferably, a frame hole locking mechanism for positioning and fixing the middle frame assembly is further provided between the base plate and the bottom surface of the middle frame assembly, the frame hole locking mechanism comprising a first middle frame positioning column and a second middle frame positioning column, the first middle frame positioning column and the second middle frame positioning column are respectively provided at two ends of the same horizontal line on the bottom side of the middle frame assembly along the length direction, and the corresponding base plate is provided with a first middle frame positioning hole and a second middle frame positioning hole respectively matched with the first middle frame positioning column and the second middle frame positioning column;

[0012] The second middle frame positioning hole is a waist-shaped hole that facilitates the second middle frame positioning column to be connected to the second middle frame positioning hole after the first middle frame positioning column is aligned and matched with the first middle frame positioning hole and the second middle frame positioning column is adaptively moved and adjusted along the length direction;

[0013] The base plate beside the first middle frame positioning hole and the second middle frame positioning hole is also provided with middle frame screw holes for fixing the positioned middle frame assembly to the base plate with screws.

[0014] Preferably, the box hole docking and locking mechanism includes a first chassis positioning hole, a second chassis positioning hole, two first chassis guide holes arranged in parallel along the length direction, and two second chassis guide holes arranged in parallel along the length direction, and the two first chassis guide holes and the two second chassis guide holes are long holes guided along the length direction of the base plate;

[0015] The first chassis positioning hole and the second chassis positioning hole are used for positioning and installing the right chassis, and are respectively arranged at the upper and lower sides of the right end of the base plate in the width direction. The two ends in the same direction of the bottom side of the right chassis are provided with a first chassis positioning column and a second chassis positioning column respectively matched with the first chassis positioning hole and the second chassis positioning hole. The second chassis positioning hole is a waist-shaped hole for facilitating the second chassis positioning column to be butted with the second chassis positioning hole after the first chassis positioning column is aligned and matched with the first chassis positioning hole, and after the second chassis positioning column is adjusted to self-adaptively move longitudinally in the width direction;

[0016] All the first guide holes of the chassis and all the second guide holes of the chassis are used for the sliding guidance and positioning installation of the left chassis along the length, and are respectively arranged at the upper and lower sides of the left end of the base plate along the width direction, and the two ends of the bottom side of the left chassis are provided with a first chassis guide bar and a second chassis guide bar that are respectively slidably matched with all the first guide holes of the chassis and all the second guide holes of the chassis;

[0017] The base plate beside the first positioning hole of the chassis, the second positioning hole of the chassis, the first guide hole of the chassis and the second guide hole of the chassis are also respectively provided with chassis screw holes for facilitating the fixing of the right chassis and the left chassis to the base plate after the guide positioning by means of screws.

[0018] Preferably, the transmission meshing mechanism comprises a rubber roller driving motor, a planetary reducer and a duplex gear, wherein the planetary reducer is mounted on the output shaft of the rubber roller driving motor, and the output gear of the planetary reducer meshes with the large gear on the duplex gear;

[0019] The rubber roller power receiving end on the flip cover assembly is mounted in the right chassis, and the rubber roller power receiving end is equipped with a rubber roller gear meshing with the small gear on the double gear. The large gear is coaxially arranged with the small gear, and the small gear adopts a long-toothed spur gear that is convenient for clutch contact with the rubber roller gear.

[0020] Preferably, the hinge shaft support plates on both sides of the end of the flip cover assembly are respectively provided with long axis holes for sleeve installation at both ends of the rubber roller along the axial direction of the rubber roller, and the corresponding two ends of the rubber roller are respectively provided with sleeves that cooperate with the long axis holes and slide freely forward and backward, and the rubber roller can slide freely forward and backward when the flip cover assembly is buckled, so that the rubber roller gear at the end of the rubber roller can adaptively fit into the right chassis slot and accurately mesh with the pinion of the double gear.

[0021] Preferably, the inner end of the sleeve is further provided with a square card which cooperates with a limiting groove recessed at the end of the flip cover assembly and is used to limit the synchronous circumferential rolling of the sleeve and the rubber roller.

[0022] Preferably, the printing self-positioning mechanism includes two U-shaped self-positioning supports symmetrically installed at both ends of the print head on the middle frame assembly, and the top ends of the two U-shaped self-positioning supports are provided with U-shaped grooves for supporting the rubber roller to move downward from both ends and adaptively cooperate with the print head on the middle frame assembly when the flip cover assembly is buckled, and the opening of the U-shaped groove gradually shrinks from large to small.

[0023] A printer comprises a base plate, a left chassis, a right chassis, a middle frame assembly and a flip cover assembly. The assembly connection of the flip cover assembly, the left chassis, the right chassis, the middle frame assembly and the base plate adopts the above-mentioned adjustable printer movement.

[0024] The beneficial effects of the present invention are:

[0025] When in use, the middle frame assembly is positioned by using the first middle frame positioning hole and the second middle frame positioning hole through the frame hole locking mechanism; then, the right chassis is positioned and fixed by using the first chassis positioning hole and the second chassis positioning hole through the case hole docking and locking mechanism, and the left chassis is slid, guided and positioned along the length through the first chassis guide bar and the second chassis guide bar; wherein, when installing the flip cover assembly, the hinge shaft at the right end of the flip cover assembly is first installed in the right chassis, and the left chassis approaches the left end of the flip cover assembly from the left end along the first chassis guide hole and the second chassis guide hole, and the shaft hole is sleeved on the hinge shaft at the left end of the flip cover assembly, so that the flip cover assembly can be easily assembled without setting the shaft as a split type, and the right chassis, the left chassis and the middle frame assembly are fixedly installed on the base plate by screws, so that the left chassis, the right chassis, the middle frame assembly and the base plate can be adaptively adjusted and assembled, and there is no need to require excessively high processing accuracy, which effectively improves assembly efficiency and product reliability.

[0026] The transmission meshing mechanism is set between the right chassis and the rubber roller on the flip cover assembly. When the flip cover assembly is closed, the rubber roller slides freely forward and backward, and the rubber roller gear at the end of the rubber roller is adaptively inserted into the slot of the right chassis and accurately meshed with the pinion of the double gear. In this way, the rubber roller driving motor can transmit torque to the rubber roller to implement rolling paper feeding. Compared with the traditional technology that sets the transmission gear as a fixed axis gear train and sets more cantilever gear columns, the rigidity and precision requirements are too high. In this embodiment, a planetary reducer is used to reduce most of the cantilever gear columns, thereby effectively reducing the precision requirements in the transmission meshing structure and effectively improving the adaptability of the transmission components. At the same time, the long axis holes on the hinge shaft support plates on both sides of the end of the flip cover assembly are freely slidable and matched with the shaft sleeves at both ends of the rubber roller. When the flip cover assembly is closed, the rubber roller slides in the long axis hole and adaptively inserts into the slot of the right chassis to limit, ensuring that the rubber roller gear and the pinion of the double gear are accurately limited and meshed, and there is no need to require too high a center distance tolerance between the rubber roller and the hinge shaft, which is also convenient for the installation and connection of the transmission meshing mechanism.

[0027] Moreover, a square card is provided on the inner end of the sleeve and is installed in the limit groove, which cooperates with the recessed limit groove at the end of the flip cover assembly. When the rubber roller rolls, the square card is stuck so that the sleeve does not roll synchronously with the rubber roller, which can reduce the friction loss at the rotating shaft, improve the effective value of the transmission system, and reduce the influence of heat on the accuracy of the transmission structure.

[0028] In addition, when the flip cover assembly is buckled, the two U-shaped self-positioning supports on the printing self-positioning mechanism support the rubber roller guide from both ends through the U-shaped groove to move downward and adaptively cooperate with the print head on the middle frame assembly, so that the print head can be limited in position. The U-shaped self-positioning supports make the alignment of the rubber roller and the print head simple and accurate, effectively reducing the assembly precision between the two.

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the explosion structure of the present invention;

[0031] Figure 2 It is a bottom view schematic diagram of the main structure of the present invention;

[0032] Figure 3 It is a partially exploded enlarged schematic diagram of the transmission meshing mechanism in the present invention;

[0033] Figure 4 It is an enlarged schematic diagram of the assembly structure of the rubber roller and the transmission meshing mechanism in the present invention;

[0034] Figure 5 It is a schematic diagram of the exploded structure of the flip cover assembly in the present invention;

[0035] Figure 6 is a bottom view structural diagram of the flip cover assembly in the present invention;

[0036] Figure 7 It is a schematic diagram of the exploded structure of the middle frame assembly in the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0039] In the description of the present invention, it should be noted that the terms "front", "rear", "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0040] An adjustable printer mechanism, such as Figure 1 As shown, the self-adaptive docking assembly used for the opening and closing of the cover of the printer for the hinged shaft and printing includes a base plate 1, a left chassis 2, a right chassis 3, a middle frame assembly 4 and a flip cover assembly 5. The left chassis 2 and the right chassis 3 are respectively installed at the two ends of the base plate 1, and the middle frame assembly 4 is located between the left chassis 2 and the right chassis 3, and the bottom end is installed close to the base plate 1; the base plate 1 is provided with a hinged shaft 52 for positioning and fixing the bottom surface of the right chassis 3 and facilitating the integrated assembly connection on the flip cover assembly 5. After one end is rotated and sleeved on the shaft hole of the right chassis 3, the other end of the flip cover assembly 5 corresponding to the left chassis 2 is rotated and sleeved along the base After the plate 1 is moved horizontally in the length direction, the corresponding hinge axis is adaptively debugged and docked, and the bottom surface of the left chassis 2 is positioned and fixed with the box hole docking and locking mechanism 6; a frame hole locking mechanism 7 for positioning and fixing the middle frame assembly 4 is also provided between the base plate 1 and the bottom surface of the middle frame assembly 4; a transmission engaging mechanism 8 for adaptive docking of the rubber roller is provided between the right chassis 3 and the power receiving end of the rubber roller on the flip cover assembly 5; a printing self-positioning mechanism 9 is provided between the flip cover assembly 5 and the middle frame assembly 4 to facilitate adaptive adjustment and coordination between the rubber roller on the flip cover assembly 5 and the print head on the middle frame assembly 4 when the two are buckled and docked.

[0041] like Figure 1 and Figure 2As shown, the frame hole locking mechanism 7 includes a first middle frame positioning column 70 and a second middle frame positioning column 71, and the first middle frame positioning column 70 and the second middle frame positioning column 71 are respectively arranged at the two ends of the same horizontal line on the bottom side of the middle frame assembly 4 along the length direction, and the corresponding base plate 1 is provided with a first middle frame positioning hole 72 and a second middle frame positioning hole 73 respectively matched with the first middle frame positioning column 70 and the second middle frame positioning column 71; the second middle frame positioning hole 73 is a waist-shaped hole that facilitates the second middle frame positioning column 71 to be adaptively adjusted along the length direction after the first middle frame positioning column 70 is aligned and matched with the first middle frame positioning hole 72; the base plate 1 beside the first middle frame positioning hole 72 and the second middle frame positioning hole 73 is also provided with a middle frame screw hole 74 that is convenient for fixing the positioned middle frame assembly 4 with the base plate 1 through screws.

[0042] Continue as Figure 1 and Figure 2 As shown, the case hole docking and locking mechanism 6 includes a first chassis positioning hole 60, a second chassis positioning hole 61, two first chassis guide holes 62 arranged in parallel along the length direction, and two second chassis guide holes 63 arranged in parallel along the length direction. The two first chassis guide holes 62 and the two second chassis guide holes 63 are all long holes guided along the length direction of the base plate 1; the first chassis positioning hole 60 and the second chassis positioning hole 61 are used for positioning and installing the right chassis 3, and are respectively arranged on the upper and lower sides of the right end of the base plate 1 along the width direction, and the two ends of the same direction of the bottom side of the right chassis 3 are provided with a first chassis positioning column 64 and a second chassis positioning column 65 respectively matched with the first chassis positioning hole 60 and the second chassis positioning hole 61. The second chassis positioning hole 61 is a waist-shaped hole after the first chassis positioning column 64 is aligned and matched with the first chassis positioning hole 60, so as to facilitate the second chassis positioning column 65 to be docked with the second chassis positioning hole 61 after adaptive longitudinal adjustment along the width direction.

[0043] Continue as Figure 1 and Figure 2 As shown, the first guide holes 62 of all chassis and the second guide holes 63 of all chassis are used for sliding guidance and positioning installation of the left chassis 2 along the length, and are respectively arranged on the upper and lower sides of the left end of the base plate 1 along the width direction, and the first chassis guide bar 66 and the second chassis guide bar 67 that slide with the first guide holes 62 of all chassis and the second guide holes 63 of all chassis are respectively provided at the two ends of the bottom side of the left chassis 2; the base plate 1 beside the first chassis positioning hole 60, the second chassis positioning hole 61, the first chassis guide hole 62 and the second chassis guide hole 63 are also respectively provided with chassis screw holes 68 for fixing the right chassis 3 and the left chassis 2 to the base plate 1 after the guide positioning by screws.

[0044] In this embodiment, during installation, the middle frame assembly 4 is positioned through the first middle frame positioning hole 72 and the second middle frame positioning hole 73 on the frame hole locking mechanism 7; then, the right chassis 3 is positioned and fixed through the first chassis positioning hole 60 and the second chassis positioning hole 61 on the case hole docking and locking mechanism 6, and then the left chassis 2 is slidably guided and positioned along the length through the first chassis guide bar 66 and the second chassis guide bar 67; when installing the flip cover assembly 5, first install the hinge shaft at the right end of the flip cover assembly 5 in the right chassis 3, and the left chassis 2 is moved from The left end is along the first guide hole 62 of the chassis, the second guide hole 63 of the chassis close to the left end of the flip cover assembly 5 and the shaft hole is sleeved on the hinge shaft at the left end of the flip cover assembly 5. In this way, the flip cover assembly 5 can be assembled without setting the shaft as a split type, and then the right chassis 3, the left chassis 2 and the middle frame assembly 4 are fixedly installed on the base plate 1 by screws, so that the left chassis 2, the right chassis 3, the middle frame assembly 4 and the base plate 1 can be adaptively adjusted and assembled, and there is no need to require excessively high processing accuracy, which effectively improves the assembly efficiency and product reliability.

[0045] like Figure 1 , Figures 3 to 6 As shown, the transmission meshing mechanism 8 includes a rubber roller driving motor 80, a planetary reducer 81 and a double gear 82. The planetary reducer 81 is installed on the output shaft of the rubber roller driving motor 80, and the output gear of the planetary reducer 81 is meshed with the large gear on the double gear 82; the power receiving end of the rubber roller 10 on the flip cover assembly 5 is sleeved in the right chassis 3, and the power receiving end of the rubber roller 10 is equipped with a rubber roller gear 11 meshed with the small gear on the double gear 82. The large gear and the small gear are coaxially arranged, and the small gear adopts a long-toothed spur gear that is easy to engage and disengage with the rubber roller gear 11. Moreover, on the hinge shaft support plates 50 at both sides of the end of the flip cover assembly 5, long shaft holes 500 for sleeve installation at both ends of the rubber roller 10 are respectively provided along the axial direction of the rubber roller 10, and the corresponding two ends of the rubber roller 10 are respectively provided with sleeves 12 that can slide freely forward and backward after cooperating with the long shaft holes 500, and can slide freely forward and backward when the flip cover assembly 5 is buckled, so that the rubber roller gear 11 at the end of the rubber roller 10 can adaptively be inserted into the slot of the right chassis 3 and accurately mesh with the small gear of the double gear 82. In this way, there is no need to require too high a height between the rubber roller 10 and the flip cover assembly 5. The center distance tolerance between the hinged shafts on the cover assembly 5 can realize the installation and connection of the transmission meshing mechanism 8; at the same time, the inner end of the sleeve 12 is also provided with a square card 120 that cooperates with the limit groove 51 recessed at the end of the flip cover assembly 5 and is used to limit the circumferential synchronous rolling of the sleeve 12 and the rubber roller 10. When the rubber roller 10 rolls, the square card 120 is stuck so that the sleeve 12 does not roll synchronously with the rubber roller 10, which can reduce the friction loss at the shaft, improve the effective value of the transmission system, and reduce the influence of heat on the accuracy of the transmission structure.

[0046] Through the transmission meshing mechanism 8, the rubber roller driving motor 80 can transmit torque to the rubber roller to implement rolling paper feeding. Compared with the traditional technology that sets the transmission gear as a fixed-axis gear train and sets more cantilever gear columns, which has too high requirements on stiffness and precision, a planetary reducer 81 is used in this embodiment to reduce most of the cantilever gear columns, thereby effectively reducing the precision requirements in the transmission meshing structure and effectively improving the adaptability of the transmission components.

[0047] like Figure 6 and Figure 7 As shown, the printing self-positioning mechanism 9 includes two U-shaped self-positioning support members 90 symmetrically installed at the two ends of the print head on the middle frame assembly 4, and the top ends of the two U-shaped self-positioning support members are provided with U-shaped grooves 91 for guiding the rubber roller to move downward from both ends when the flip cover assembly 5 is buckled and adaptively cooperate with the print head 40 on the middle frame assembly 4. The opening of the U-shaped groove 91 gradually shrinks from large to small. The U-shaped self-positioning support member 90 makes the alignment of the rubber roller 10 and the print head 40 simple and accurate, effectively reducing the assembly accuracy between the two.

[0048] When in use, the left chassis 2 and the right chassis 3 are installed at both ends of the base plate 1, and a middle frame assembly 4 and a flip assembly 5 are arranged between the left chassis 2 and the right chassis 3. A printing assembly is arranged inside the middle frame assembly 4, and the printing assembly is elastically arranged. The hinged shafts at the rear sides of the two ends of the flip assembly 5 are respectively hinged with the shaft holes on the left chassis 2 and the right chassis 3, and the two end surfaces of the opening and closing part of the front side of the flip assembly 5 are provided with clamping holes, and a rubber roller is arranged between the hinge and the clamping hole. When the flip assembly 5 is closed, the rubber roller abuts against the printing assembly and is subjected to an elastic reaction force, and the wedge-shaped locking pin head is buckled with the clamping hole, thereby locking the flip assembly 5; when the cover is opened, the locking component is pressed, and the flip assembly 5 bounces upward under the elastic force of the printing assembly, thereby releasing the lock.

[0049] The above-described embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes made based on the shape, structure and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable printer mechanism for adaptive butt assembly of hinged shaft and printing, It is characterized in that It includes a base plate, a left chassis, a right chassis, a middle frame assembly and a flip cover assembly, wherein the left chassis and the right chassis are respectively installed at two ends of the base plate, and the middle frame assembly is located between the left chassis and the right chassis, and the bottom end is installed close to the base plate; The base plate is provided with a case hole docking and locking mechanism for positioning and fixing the bottom surface of the right chassis, so that one end of the rotating shaft connected to the flip cover assembly can be rotated and sleeved into the rotating shaft hole of the right chassis, and the other end of the rotating shaft can be adaptively debugged and docked at the corresponding rotating shaft after the left chassis is horizontally moved along the length direction of the base plate, and the bottom surface of the left chassis is positioned and fixed; A transmission engagement mechanism for adaptive docking of the rubber roller is provided between the right chassis and the power receiving end of the rubber roller on the flip cover assembly; A printing self-positioning mechanism is provided between the flip cover assembly and the middle frame assembly to facilitate adaptive adjustment and cooperation between the rubber roller on the flip cover assembly and the print head on the middle frame assembly when the two are buckled and docked; A frame hole locking mechanism for positioning and fixing the middle frame assembly is also provided between the base plate and the bottom surface of the middle frame assembly, and the frame hole locking mechanism includes a first middle frame positioning column and a second middle frame positioning column, the first middle frame positioning column and the second middle frame positioning column are respectively arranged at two ends of the same horizontal line on the bottom side of the middle frame assembly along the length direction, and the corresponding base plate is provided with a first middle frame positioning hole and a second middle frame positioning hole respectively matched with the first middle frame positioning column and the second middle frame positioning column; The second middle frame positioning hole is a waist-shaped hole that facilitates the second middle frame positioning column to be connected to the second middle frame positioning hole after the first middle frame positioning column is aligned and matched with the first middle frame positioning hole and the second middle frame positioning column is adaptively moved and adjusted along the length direction; The base plate beside the first middle frame positioning hole and the second middle frame positioning hole is also provided with middle frame screw holes for fixing the positioned middle frame assembly to the base plate with screws; The box hole docking and locking mechanism includes a first chassis positioning hole, a second chassis positioning hole, two first chassis guide holes arranged in parallel along the length direction, and two second chassis guide holes arranged in parallel along the length direction, and the two first chassis guide holes and the two second chassis guide holes are long holes guided along the length direction of the base plate; The first chassis positioning hole and the second chassis positioning hole are used for positioning and installing the right chassis, and are respectively arranged at the upper and lower sides of the right end of the base plate in the width direction. The two ends in the same direction of the bottom side of the right chassis are provided with a first chassis positioning column and a second chassis positioning column respectively matched with the first chassis positioning hole and the second chassis positioning hole. The second chassis positioning hole is a waist-shaped hole for facilitating the second chassis positioning column to be butted with the second chassis positioning hole after the first chassis positioning column is aligned and matched with the first chassis positioning hole, and after the second chassis positioning column is adjusted to self-adaptively move longitudinally in the width direction; All the first guide holes of the chassis and all the second guide holes of the chassis are used for the sliding guidance and positioning installation of the left chassis along the length, and are respectively arranged at the upper and lower sides of the left end of the base plate along the width direction, and the two ends of the bottom side of the left chassis are provided with a first chassis guide bar and a second chassis guide bar that are respectively slidably matched with all the first guide holes of the chassis and all the second guide holes of the chassis; The base plate beside the first positioning hole of the chassis, the second positioning hole of the chassis, the first guide hole of the chassis and the second guide hole of the chassis are also respectively provided with chassis screw holes for facilitating the fixing of the right chassis and the left chassis to the base plate after the guide positioning by means of screws.

2. An adjustable printer mechanism according to claim 1, Features: The transmission meshing mechanism comprises a rubber roller driving motor, a planetary reducer and a duplex gear, wherein the planetary reducer is mounted on the output shaft of the rubber roller driving motor, and the output gear of the planetary reducer meshes with the large gear on the duplex gear; The rubber roller power receiving end on the flip cover assembly is mounted in the right chassis, and the rubber roller power receiving end is equipped with a rubber roller gear meshing with the small gear on the double gear. The large gear is coaxially arranged with the small gear, and the small gear adopts a long-toothed spur gear that is convenient for clutch contact with the rubber roller gear.

3. An adjustable printer mechanism according to claim 2, Features: The hinge shaft support plates on both sides of the end of the flip cover assembly are respectively provided with long axis holes for the two ends of the rubber roller to be sleeved and installed along the axial direction of the rubber roller, and the corresponding two ends of the rubber roller are respectively provided with sleeves that cooperate with the long axis holes and slide freely forward and backward. When the flip cover assembly is buckled, the rubber roller can slide freely forward and backward to facilitate the rubber roller gear at the end of the rubber roller to adaptively fit into the right chassis slot and accurately mesh with the pinion of the double gear.

4. An adjustable printer mechanism according to claim 3, Features: The inner end of the shaft sleeve is also provided with a square card which cooperates with the limiting groove recessed at the end of the flip cover assembly and is used to limit the synchronous circumferential rolling of the shaft sleeve and the rubber roller.

5. The adjustable printer mechanism according to claim 1, Features: The printing self-positioning mechanism includes two U-shaped self-positioning support members symmetrically installed at the two ends of the print head on the middle frame assembly. The top ends of the two U-shaped self-positioning support members are provided with U-shaped grooves for supporting the rubber roller to move downward from both ends and adaptively cooperate with the print head on the middle frame assembly when the flip cover assembly is buckled. The opening of the U-shaped groove gradually shrinks from large to small.

6. A printer, comprising a base plate, a left chassis, a right chassis, a middle frame assembly and a flip cover assembly, It is characterized in that The assembly connection between the flip cover assembly, the left chassis, the right chassis, the middle frame assembly and the base plate adopts an adjustable printer movement as described in any one of claims 1 to 5.

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