Synchronous cover opening and closing mechanism of portable printer and limiting mode of synchronous cover opening and closing mechanism

Abstract

The invention belongs to the technical field of printers, and particularly relates to a synchronous cover opening and closing mechanism of a portable printer and a limiting mode thereof.The synchronous cover opening and closing mechanism comprises a base, a closing cover is rotationally connected to the upper surface of the base, a rubber roller is rotationally connected to the lower surface of the closing cover, and a printing head is fixedly connected to the upper surface of the base; two limiting assemblies are arranged at the two ends of the base, a transmission assembly is in transmission connection between the two limiting assemblies, the transmission assembly comprises a connecting shaft rotationally arranged on the upper surface of the base, the connecting shaft can enable the two limiting assemblies to synchronously work, and each limiting assembly comprises an elastic clamping hook; the push blocks are fixedly connected to the two sides of the closing cover, the push blocks can be connected with the clamping hooks in a clamped mode to limit the closing cover of the printer, and the limiting assembly is arranged, so that the problem that due to the fact that the left hand and the right hand are not synchronous, a turning cover of the printer shakes or bounces off inconsistently when being opened is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of printers, in particular to a synchronous cover opening and closing mechanism of a portable printer and a limiting method thereof. Background Art

[0002] Wide-format portable thermal transfer printers are the first choice for many professionals and enthusiasts due to their efficient printing capabilities and portable design. This type of printer is designed for wide-format material printing and can easily handle the printing needs of large-format images, text or patterns. Its portability allows it to be used flexibly in various occasions, whether it is outdoor advertising production, on-site event printing, or personal creation display.

[0003] In the actual use of wide-format portable thermal transfer printers, if the user tries to press the two buttons with both hands to open the printer cover, the space limitation and the slight time difference of hand operation often cause the locks at both ends to be released asynchronously. This asynchrony will cause the printer cover to shake or bounce inconsistently when opening, which not only affects the user's operating experience, but may also cause unnecessary damage to the printer itself.

[0004] To this end, the present invention provides a portable printer synchronous cover opening and closing mechanism and a limiting method thereof. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a portable printer synchronous opening and closing cover mechanism and its limiting method described in the present invention comprises a base, the upper surface of the base is rotatably connected to a closing cover, the lower surface of the closing cover is rotatably connected to a rubber roller, the upper surface of the base is fixedly connected to a print head, Two groups of limit assemblies are arranged at both ends of the base, and a transmission assembly is connected between the two groups of limit assemblies. The transmission assembly includes a connecting shaft rotatably arranged on the upper surface of the base, and the connecting shaft can make the two groups of limit assemblies work synchronously. Each group of limit assemblies includes an elastically arranged hook and push blocks fixedly connected on both sides of the closing cover. The push blocks can be engaged with the hooks to limit the closing cover of the printer.

[0007] Preferably, each group of the limit assembly includes a fixed seat fixedly connected to the end of the base, a sliding groove is opened on one side of the fixed seat, a sliding block is slidably connected in the sliding groove, the sliding block is a button switch, and the sliding block can push a hook elastically set at the end of the base.

[0008] Preferably, a guiding surface is provided on the upper surface of the hook, a locking surface is provided on one side of the hook, a buckle surface is provided on one side of the push block, and a sliding surface is provided on the lower surface of the push block. The sliding surface of the push block will abut against the guiding surface of the hook and squeeze each other. After the hook rotates at a certain angle, the locking surface of the hook will abut against the buckle surface of the push block, thereby completing the locking.

[0009] Preferably, a positioning shaft is fixedly connected to one side of the fixing seat, a torsion spring is sleeved on the circumferential surface of the positioning shaft, a boss is fixedly connected to one side of the hook, a groove is formed on one side of the boss, and a pin of the torsion spring abuts against the groove for resetting the hook.

[0010] Preferably, the same connecting shaft is inserted between the two hooks, both ends of the connecting shaft are fixedly connected to limiting columns, both ends of the connecting shaft are fixedly connected to protrusions, the protrusions are cylindrical, the cross-section of the limiting column is "D"-shaped, and a "D"-shaped fixing hole is provided at one end of the hook, and one of the hooks rotates to transfer the torque to the other hook through the connecting shaft, thereby realizing the synchronous opening and closing of the hook cover, and a positioning hole is provided on one side of each of the fixing seats, and the positioning hole can be inserted into the cylindrical protrusion.

[0011] Preferably, the connecting shaft is rotatably arranged on the upper surface of the base, and a long hole is opened in the base at a position corresponding to the connecting shaft, and the long hole is used to limit the connecting shaft.

[0012] Preferably, a blocking block is fixedly connected to one side of the fixed seat, and the blocking block is used to block the hook, that is, to indirectly limit the sliding of the sliding block, so as to prevent the hook from being excessively reset and squeezed. A through hole is opened at the position of the fixed seat corresponding to the boss, and the boss can move within the range of the through hole.

[0013] Preferably, the two sliding blocks slide along the sliding groove at the same time, the sliding blocks squeeze the boss, and drive the two hooks to rotate. After the rotation, the two hooks release the engagement with the push blocks at both ends of the closing cover, and then the closing cover can rotate.

[0014] Preferably, the two fixing seats are fixedly connected to the same connecting rod, a positioning rod is fixedly connected to one side of the connecting rod, a plurality of spray holes are opened on one side of the positioning rod, and a fan is built into the positioning rod. When the printer starts working, text will be printed on the printing paper after the printing paper passes through the print head and the rubber roller. The built-in fan of the positioning rod is started, and the cold air blown out will act on the printing paper for quick drying.

[0015] A portable printer synchronous opening and closing cover limiting method, the specific steps include: Step 1: Printing. First, place the paper to be printed between the rubber roller and the print head, and then rotate the closing cover so that the push blocks at both ends of the closing cover can be engaged with the fixing seat, thereby completing the position limit of the closing plate. After the position limit is completed, start the printer to print; Step 2: After printing is completed, unlock the closing cover, turn it up and remove the printed paper.

[0016] The beneficial effects of the present invention are as follows: 1. The invention discloses a synchronous opening and closing cover mechanism for a portable printer and a limiting method thereof. The base is used as a supporting structure, and the closing cover installed thereon can be opened and closed by rotation. The rubber roller on the lower surface of the closing cover helps to smoothly transport the paper. The print head is fixed on the base and is responsible for the printing task. The specially designed limiting component is combined with the transmission component to achieve a stable limiting of the closing cover. When the closing cover is closed, the push blocks on both sides thereof will engage with the elastically arranged hooks. This action is synchronously transmitted to the two sets of limiting components through the connecting shaft to ensure that the closing cover is firmly locked. When opening, the push blocks can be easily released by overcoming the elastic force of the hooks to achieve the opening of the closing cover.

[0017] 2. The synchronous opening and closing cover mechanism of a portable printer and its limiting method described in the present invention are fixedly connected to the end of the base through a fixed seat, and the sliding groove thereon provides a guide for the sliding block. The sliding block serves as a button switch and can move along the sliding groove. When it is necessary to open the closing cover, the sliding block is pressed, and the sliding block pushes the elastically set hook to move so that it disengages from the push block on the closing cover. When closing, the sliding block is pressed again and the closing cover is rotated, and then the sliding block is released to drive the hook to move in the opposite direction and engage with the push block, thereby realizing the closing of the closing cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention; Figure 2 It is a structural schematic diagram of the rubber roller of the present invention; Figure 3 It is a schematic diagram of the disassembled structure of the printer of the present invention; Figure 4 It is a structural schematic diagram of the connecting shaft of the present invention; In the figure: 1, base; 11, closing cover; 12, rubber roller; 13, print head; 14, push block; 15, buckle surface; 16, sliding surface; 17, fixed seat; 18, sliding block; 19, sliding groove; 110, torsion spring; 111, positioning shaft; 112, blocking block; 113, positioning hole; 114, hook; 115, connecting shaft; 116, through hole; 117, fixing hole; 118, protrusion; 119, limiting column; 120, boss; 121, groove; 122, guide surface; 123, locking surface; 124, long hole; 2. Connecting rod; 21. Positioning rod; 22. Spray hole. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Embodiment 1: Figures 1 to 4 As shown, a portable printer synchronous opening and closing cover mechanism and its limiting method according to an embodiment of the present invention comprises a base 1, a closing cover 11 is rotatably connected to the upper surface of the base 1, a rubber roller 12 is rotatably connected to the lower surface of the closing cover 11, and a print head 13 is fixedly connected to the upper surface of the base 1. Two groups of limit assemblies are arranged at both ends of the base 1, and a transmission assembly is connected between the two groups of limit assemblies. The transmission assembly includes a connecting shaft 115 rotatably arranged on the upper surface of the base 1, and the connecting shaft 115 can make the two groups of limit assemblies work synchronously. Each group of limit assemblies includes an elastically arranged hook 114 and a push block 14 fixedly connected to both sides of the closing cover 11. The push block 14 can be engaged with the hook 114 to limit the closing cover 11 of the printer.

[0022] Specifically, first, the base 1 serves as a supporting structure, and the closing cover 11 installed thereon can be opened and closed by rotation. The rubber roller 12 on the lower surface of the closing cover 11 helps to smoothly transport the paper. The print head 13 is fixed on the base 1 and is responsible for the printing task. The specially designed limit assembly is combined with the transmission assembly to achieve a stable limit on the closing cover 11. When the closing cover 11 is closed, the push blocks 14 on both sides thereof will be engaged with the elastically arranged hooks 114. This action is synchronously transmitted to the two sets of limit assemblies through the connecting shaft 115 to ensure that the closing cover 11 is firmly locked. When opening, the push block 14 can be easily released by overcoming the elastic force of the hook 114 to achieve the opening of the closing cover 11. A stable and reliable closing cover 11 limiting method is provided, which effectively prevents the printer from malfunctioning or being damaged due to accidental opening of the closing cover 11 during operation, thereby improving the overall stability and durability of the printer. At the same time, the operation is simple, and the opening and closing of the closing cover 11 can be completed without complicated steps, which greatly improves the convenience of use. Solved the problem that the left and right hands are out of sync, which can cause the printer cover to shake or pop open inconsistently when opening.

[0023] like Figure 3 As shown, each set of limiting components in this embodiment includes a fixed seat 17 fixedly connected to the end of the base 1, and a sliding groove 19 is opened on one side of the fixed seat 17. A sliding block 18 is slidably connected in the sliding groove 19. The sliding block 18 is a button switch, and the sliding block 18 can push a hook 114 elastically set at the end of the base 1.

[0024] Specifically, the core of each set of limit assembly lies in the cooperation between the fixed seat 17 and the sliding block 18. The fixed seat 17 is fixedly connected to the end of the base 1, and the sliding groove 19 thereon provides a guide for the sliding block 18. The sliding block 18 serves as a button switch and can move along the sliding groove 19. When the closing cover 11 needs to be opened, the sliding block 18 is pressed, and the sliding block 18 pushes the elastically set hook 114 to move so that it is disengaged from the push block 14 on the closing cover 11. When closing, the sliding block 18 is pressed again, and the closing cover 11 is rotated, and then the sliding block 18 is released to drive the hook 114 to move in the opposite direction and engage with the push block 14, thereby realizing the closing of the closing cover 11.

[0025] like Figure 2 and Figure 4 As shown, in this embodiment, a guide surface 122 is provided on the upper surface of the hook 114, a locking surface 123 is provided on one side of the hook 114, a buckle surface 15 is provided on one side of the push block 14, and a sliding surface 16 is provided on the lower surface of the push block 14. The sliding surface 16 of the push block 14 will abut against and squeeze the guide surface 122 of the hook 114. After the hook 114 rotates at a certain angle, the locking surface 123 of the hook 114 will abut against the buckle surface 15 of the push block 14, thereby completing the locking.

[0026] Specifically, in the cooperation between the hook 114 and the push block 14, the guide surface 122 on the upper surface of the hook 114 plays a key role. When the sliding surface 16 of the push block 14 contacts and is squeezed by the guide surface 122, the hook 114 will rotate around its fixed point at a certain angle. This rotation allows the engaging surface 123 on one side of the hook 114 to gradually approach and eventually tightly abut against the buckle surface 15 on one side of the push block 14, thereby completing the engaging action and ensuring the stable locking of the closing cover 11. The closing cover 11 can be locked and unlocked through simple operations, thereby improving the convenience of the printer.

[0027] like Figure 4 As shown, in this embodiment, a positioning shaft 111 is fixedly connected to one side of the fixing seat 17, and a torsion spring 110 is sleeved on the circumferential surface of the positioning shaft 111. A boss 120 is fixedly connected to one side of the hook 114, and a groove 121 is formed on one side of the boss 120. A pin of the torsion spring 110 abuts against the groove 121 for resetting the hook 114.

[0028] Specifically, a torsion spring 110 is sleeved on the positioning shaft 111 fixed to one side of the fixing seat 17, and one pin of the torsion spring 110 abuts against the groove 121 of the boss 120 fixed to one side of the hook 114. When the hook 114 is rotated by an external force, the torsion spring 110 will be compressed or stretched to store elastic potential energy. Once the external force disappears, the torsion spring 110 releases the potential energy and pushes the boss 120 and the hook 114 to rotate in the opposite direction through the pin, thereby realizing automatic resetting of the hook 114. This process ensures that the hook 114 can stably maintain its initial position when not subject to external force, and is ready for the next clamping action.

[0029] Embodiment 2: Figures 1 to 4 As shown, compared with Example 1, another implementation of the present invention is: the same connecting shaft 115 is inserted between the two hooks 114, and both ends of the connecting shaft 115 are fixedly connected to limiting columns 119, and both ends of the connecting shaft 115 are fixedly connected to protrusions 118, and the protrusions 118 are cylindrical. The cross-section of the limiting column 119 is "D"-shaped, and a "D"-shaped fixing hole 117 is provided at one end of the hook 114. One of the hooks 114 rotates to transfer the torque to the other hook 114 through the connecting shaft 115, so as to realize the synchronous opening and closing of the hook 114, and a positioning hole 113 is provided on one side of each fixing seat 17, and the positioning hole 113 can be inserted into the cylindrical protrusion 118.

[0030] Specifically, a connecting shaft 115 is inserted between the two hooks 114, and both ends of the connecting shaft 115 are fixedly connected to the limiting column 119 and the cylindrical protrusion 118. The D-shaped fixing hole 117 of the hook 114 cooperates with the limiting column 119 to ensure a stable connection between the connecting shaft 115 and the hook 114. When one of the hooks 114 is rotated by an external force, the torque will be quickly transmitted to the other hook 114 through the connecting shaft 115, so that the synchronous opening and closing of the two hooks 114 is realized. At the same time, each fixing seat 17 The positioning hole 113 on one side can be inserted into the cylindrical protrusion 118, further enhancing the stability between the connecting shaft 115 and the fixing seat 17, and preventing the connecting shaft 115 from loosening or falling off during the rotation process. This design not only realizes the synchronous opening and closing function of the two hooks 114, but also improves the stability and reliability of the entire locking mechanism. The D-shaped fixing hole 1177 of the hook 114 cooperates with the limiting column 119 to effectively prevent the connecting shaft 115 from deflecting or falling off during the rotation process, thereby ensuring the accuracy and consistency of the action of the hook 114.

[0031] like Figure 3 As shown, in this embodiment, the connecting shaft 115 is rotatably arranged on the upper surface of the base 1 , and the base 1 is provided with a long hole 124 at a position corresponding to the connecting shaft 115 , and the long hole 124 is used to limit the connecting shaft 115 .

[0032] Specifically, the connecting shaft 115 is rotatably set on the upper surface of the base 1 and is limited by the long hole 124 on the base 1. The design of the long hole 124 allows the connecting shaft 115 to rotate freely within a certain range while limiting its axial movement, ensuring that the synchronous opening and closing action of the hook 114 is stable and orderly.

[0033] like Figure 3 As shown, in this embodiment, a blocking block 112 is fixedly connected to one side of the fixed seat 17. The blocking block 112 is used to block the hook 114, that is, to indirectly limit the sliding of the sliding block 18, and can prevent the hook 114 from being excessively reset and squeezed. A through hole 116 is opened at the position of the fixed seat 17 corresponding to the boss 120, and the boss 120 can move within the range of the through hole 116.

[0034] Specifically, the blocking block 112 fixedly connected to one side of the fixed seat 17 has the function of indirectly limiting the sliding of the sliding block 18 by blocking the boss 120 when the hook 114 is reset, thereby effectively preventing the hook 114 from being squeezed or damaged due to excessive reset. At the same time, a through hole 116 is provided at a position corresponding to the boss 120 on the fixed seat 17, allowing the boss 120 to move freely within the range of the through hole 116, ensuring that the hook 114 can move smoothly during the reset process, which not only enhances the stability and reliability of the latching mechanism, but also avoids the risk of damage caused by excessive reset of the hook 114. Through the cooperation of the blocking block 112 and the through hole 116, the reset action of the hook 114 is accurately controlled, thereby improving the overall safety and durability of use.

[0035] like Figure 3 As shown, in this embodiment, the two sliding blocks 18 slide along the sliding groove 19 at the same time, and the sliding blocks 18 squeeze the boss 120 to drive the two hooks 114 to rotate. After the rotation, the two hooks 114 release the engagement with the push blocks 14 at both ends of the closing cover 11, and then the closing cover 11 can be rotated.

[0036] Specifically, the two sliding blocks 18 slide along the sliding groove 19 at the same time, and this action squeezes the boss 120, thereby driving the two hooks 114 to rotate synchronously. When the hooks 114 rotate to a specific position, the engagement between them and the push blocks 14 at both ends of the closing cover 11 is released, and the closing cover 11 can rotate freely to achieve the opening and closing action.

[0037] like Figure 1 As shown, in this embodiment, two fixing seats 17 are fixedly connected to the same connecting rod 2, a positioning rod 21 is fixedly connected to one side of the connecting rod 2, a plurality of nozzle holes 22 are opened on one side of the positioning rod 21, and a fan is built in the positioning rod 21. When the printer starts working, text will be printed on the printing paper after the printing paper passes through the print head 13 and the rubber roller 12. The built-in fan of the positioning rod 21 is started, and the cold air blown out will act on the printing paper for quick drying.

[0038] Specifically, the two fixing seats 17 are firmly connected by the same connecting rod 2. A plurality of nozzles 22 are provided on a positioning rod 21 fixed to one side of the connecting rod 2, and a built-in fan is provided. When the printer starts working, the printing paper passes through the print head 13 and the rubber roller 12 in sequence to complete the text printing. Subsequently, the fan in the positioning rod 21 is started to blow out cold air through the nozzle 22, directly acting on the printing paper that has just been printed. The cold air is used to accelerate the drying of the ink and achieve a quick-drying effect, which not only improves the printing efficiency but also ensures the stability of the printing quality.

[0039] A portable printer synchronous opening and closing cover limiting method, the specific steps include: Step 1: Printing, first place the printing paper to be printed between the rubber roller 12 and the print head 13, then rotate the closing cover 11, so that the push blocks 14 at both ends of the closing cover 11 can be engaged with the fixing seat 17, thereby completing the position limiting of the one-point closing plate, and then start the printer to print after the position limiting is completed; Step 2: After printing is completed, unlock the closing cover 11, rotate the closing cover 11, and then take out the printed paper.

[0040] Working principle: first, the base 1 is used as a supporting structure, and the closing cover 11 installed thereon can be opened and closed by rotation. The rubber roller 12 on the lower surface of the closing cover 11 helps to smoothly transport the paper. The print head 13 is fixed on the base 1 and is responsible for the printing task. The specially designed limit assembly is combined with the transmission assembly. Specifically, through the cooperation of each group of limit assembly fixed seat 17 and sliding block 18, the fixed seat 17 is fixed to the end of the base 1, and the sliding groove 19 thereon provides a guide for the sliding block 18. The sliding block 18 is used as a button switch and can move along the sliding groove 19. When it is necessary to open the closing cover 11, press the sliding block 18, and the sliding block 18 pushes the elastically set hook 114 to move, so that it is disengaged from the push block 14 on the closing cover 11. When closing, press the sliding block 18 again, and rotate the closing cover 11, and then release the sliding block 18 to drive the hook 114 to move in the opposite direction and engage with the push block 14, thereby realizing the closing of the closing cover 11; In the cooperation between the hook 114 and the push block 14, the guide surface 122 on the upper surface of the hook 114 plays a key role. When the sliding surface 16 of the push block 14 contacts and is squeezed by the guide surface 122, the hook 114 rotates around its fixed point at a certain angle. This rotation enables the engaging surface 123 on one side of the hook 114 to gradually approach and finally tightly abut against the buckle surface 15 on one side of the push block 14, thereby completing the engaging action. The closed cover 11 is firmly limited. In addition, a torsion spring 110 is sleeved on the positioning shaft 111 fixed to one side of the fixing seat 17. One pin of the torsion spring 110 abuts against the groove 121 of the boss 120 fixed to one side of the hook 114. When the hook 114 is rotated by an external force, the torsion spring 110 will be compressed or stretched to store elastic potential energy. Once the external force disappears, the torsion spring 110 releases the potential energy and pushes the boss 120 and the hook 114 to rotate in the opposite direction through the pin, so that the hook 114 is automatically reset. This process ensures that the hook 114 can stably maintain its initial position when not subject to external force, so as to be ready for the next clamping action. In addition, the two fixing seats 17 are firmly connected by the same connecting rod 2. A plurality of nozzles 22 are provided on a positioning rod 21 fixed to one side of the connecting rod 2, and a fan is built in. When the printer starts working, the printing paper passes through the print head 13 and the rubber roller 12 in sequence to complete the text printing. Then, the fan in the positioning rod 21 is started to blow out cold air through the nozzles 22, directly acting on the printing paper just printed, and the cold air is used to accelerate the drying of the ink to achieve a quick drying effect, which not only improves the printing efficiency, but also ensures the stability of the printing quality. Finally, take the printed paper.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A synchronous opening and closing cover mechanism for a portable printer, comprising a base (1), a closing cover (11) being rotatably connected to the upper surface of the base (1), a rubber roller (12) being rotatably connected to the lower surface of the closing cover (11), and a print head (13) being fixedly connected to the upper surface of the base (1), characterized in that: Two groups of limit assemblies are arranged at both ends of the base (1), and a transmission assembly is connected between the two groups of limit assemblies in a transmission manner. The transmission assembly includes a connecting shaft (115) rotatably arranged on the upper surface of the base (1), and the connecting shaft (115) can enable the two groups of limit assemblies to work synchronously. Each group of limit assemblies includes an elastically arranged hook (114) and a push block (14) fixedly connected to both sides of the closing cover (11), and the push block (14) can be engaged with the hook (114) to limit the closing cover (11) of the printer.

2. A synchronous cover opening and closing mechanism for a portable printer according to claim 1, characterized in that: Each group of the limit assembly comprises a fixed seat (17) fixedly connected to the end of the base (1), a sliding groove (19) is provided on one side of the fixed seat (17), a sliding block (18) is slidably connected in the sliding groove (19), and the sliding block (18) is a button switch, and the sliding block (18) can push a hook (114) elastically arranged at the end of the base (1).

3. A portable printer synchronous cover opening and closing mechanism according to claim 1, characterized in that: The upper surface of the hook (114) is provided with a guide surface (122), one side of the hook (114) is provided with a locking surface (123), one side of the push block (14) is provided with a buckle surface (15), and the lower surface of the push block (14) is provided with a sliding surface (16). The sliding surface (16) of the push block (14) will abut against the guide surface (122) of the hook (114) and squeeze each other. After the hook (114) rotates at a certain angle, the locking surface (123) of the hook (114) will abut against the buckle surface (15) of the push block (14), thereby completing the locking.

4. A portable printer synchronous cover opening and closing mechanism according to claim 2, characterized in that: A positioning shaft (111) is fixedly connected to one side of the fixing seat (17), a torsion spring (110) is sleeved on the circumferential surface of the positioning shaft (111), a boss (120) is fixedly connected to one side of the hook (114), a groove (121) is formed on one side of the boss (120), and a pin of the torsion spring (110) abuts against the groove (121) for resetting the hook (114).

5. A synchronous cover opening and closing mechanism for a portable printer according to claim 4, characterized in that: A common connecting shaft (115) is inserted between the two hooks (114), both ends of the connecting shaft (115) are fixedly connected to limiting columns (119), both ends of the connecting shaft (115) are fixedly connected to protrusions (118), the protrusions (118) are cylindrical, the limiting columns (119) have a "D"-shaped cross section, one end of the hook (114) is provided with a "D"-shaped fixing hole (117), one of the hooks (114) rotates to transmit torque to the other hook (114) through the connecting shaft (115), thereby realizing synchronous opening and closing of the hooks (114), and each of the fixing seats (17) is provided with a positioning hole (113) on one side, and the positioning hole (113) can be inserted into the cylindrical protrusion (118).

6. A portable printer synchronous cover opening and closing mechanism according to claim 5, characterized in that: The connecting shaft (115) is rotatably arranged on the upper surface of the base (1); a long hole (124) is provided on the base (1) at a position corresponding to the connecting shaft (115); the long hole (124) is used to limit the position of the connecting shaft (115).

7. A portable printer synchronous cover opening and closing mechanism according to claim 2, characterized in that: A blocking block (112) is fixedly connected to one side of the fixed seat (17), and the blocking block (112) is used to block the hook (114), that is, to indirectly limit the sliding of the sliding block (18), so as to prevent the hook (114) from being excessively reset and squeezed. A through hole (116) is formed in the fixed seat (17) at a position corresponding to the boss (120), and the boss (120) can move within the range of the through hole (116).

8. A synchronous cover opening and closing mechanism for a portable printer according to claim 7, characterized in that: The two sliding blocks (18) slide along the sliding groove (19) at the same time, and the sliding blocks (18) press the boss (120), driving the two hooks (114) to rotate. After the two hooks (114) rotate, they release the engagement with the push blocks (14) at both ends of the closing cover (11), and then the closing cover (11) can rotate.

9. A portable printer synchronous cover opening and closing mechanism according to claim 2, characterized in that: The two fixing seats (17) are fixedly connected to the same connecting rod (2), one side of the connecting rod (2) is fixedly connected to a positioning rod (21), one side of the positioning rod (21) is provided with a plurality of spray holes (22), and the positioning rod (21) has a built-in fan. When the printer starts working, after the printing paper passes through the print head (13) and the rubber roller (12), text will be printed on the printing paper, and the built-in fan of the positioning rod (21) will be started, and the cold air blown out will act on the printing paper to perform a quick drying operation.

10. A portable printer synchronous cover opening and closing limit method, applied to a portable printer synchronous cover opening and closing mechanism according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1: Printing, firstly, place the printing paper to be printed between the rubber roller (12) and the print head (13), then rotate the closing cover (11) so that the push blocks (14) at both ends of the closing cover (11) can be engaged with the fixing seat (17), thereby completing the position limiting of the closing cover (11), and then start the printer to print; Step 2: After printing is completed, unlock the closing cover (11), rotate the closing cover (11), and then remove the printed paper.

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