Light and stable A3 printer

Abstract

The invention discloses a light and stable A3 printer which comprises an independent printing head assembly and a plastic part shell, a sheet metal part fixing bottom plate is arranged in the plastic part shell, a screw connecting structure is arranged between the sheet metal part fixing bottom plate and the plastic part shell, the independent printing head assembly is installed on the sheet metal part fixing bottom plate, and the independent printing head assembly is installed on the plastic part shell. A plurality of plug pin positioning structures are arranged between the sheet metal part fixing bottom plate and the independent printing head assembly, the sheet metal part fixing bottom plate is provided with spring bolt sliding block assemblies used for limiting separation of the plug pin positioning structures, and synchronous control structures are arranged among the multiple spring bolt sliding block assemblies on the same side; through reasonable structural design, the mounting precision and printing stability of the printing head assembly are guaranteed while light weight and low cost are realized by adopting the plastic shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printers, in particular to a light and stable A3 printer. BACKGROUND

[0002] In the field of A3 size thermal printer, the existing technology generally adopts 4MM thick die casting shell design to solve the problem that long strip type plastic material is easy to deform, resulting in unstable printing quality and unable to mass production. The high strength characteristics of the die casting support the internal print head assembly to ensure the cooperation precision of the print head and the rubber roller. However, the die casting shell has significant defects: on the one hand, the die casting material has high density, resulting in large weight of the whole machine, poor portability, and greatly limiting the terminal application scenarios; on the other hand, the polishing and paint spraying process of the die casting is complex, and its cost is several tens of times of that of the plastic shell of the same specification, which is not conducive to the cost control and market promotion of the product.

[0003] In order to improve the portability and cost, some technologies try to replace the die casting shell with a plastic shell, but new technical problems arise: the structural strength and deformation resistance of the plastic material are much lower than those of the die casting. When the print head assembly is directly installed inside the plastic shell, the plastic shell is easy to deform during long-term use or stress, which causes the installation position of the print head assembly to deviate. At the same time, the connection between the existing print head assembly and the shell is mostly fixed by a single screw, which lacks precise positioning structure and stable locking mechanism, and cannot guarantee the relative position accuracy of the print head assembly and the shell, which ultimately causes the parallelism and coincidence of the rubber roller and the thermal sheet printing line to decrease, seriously affecting the printing quality, and even causing printing blur, paper jam and other faults, which is difficult to meet the core demand of A3 printer for printing stability.

[0004] In view of the contradiction between the poor portability and high cost of the die casting shell in the existing technology and the inaccurate positioning of the print head and unstable printing quality caused by the deformation of the plastic shell, it is urgent to design an A3 printer structure that takes into account portability and stability. By optimizing the shell material and the assembly method of the print head assembly, the weight and cost are reduced by using a plastic shell, while the installation accuracy and stability of the print head assembly are guaranteed, and the defects of the existing technology are solved.

[0005] Therefore, the existing printer technology field needs to be further improved. SUMMARY

[0006] The purpose of the present application is to provide a light and stable A3 printer, which realizes lightweight and low cost by using a plastic shell, while guaranteeing the installation accuracy of the print head assembly and the printing stability.

[0007] In order to achieve the above purpose, the present application adopts the following scheme: A light and stable A3 printer, comprising an independent print head assembly and a plastic shell, a sheet metal fixing bottom plate is arranged in the plastic shell, a screw connection structure is arranged between the sheet metal fixing bottom plate and the plastic shell, the independent print head assembly is installed on the sheet metal fixing bottom plate, a plurality of bolt positioning structures are arranged between the sheet metal fixing bottom plate and the independent print head assembly, a lock tongue sliding block assembly for limiting the bolt positioning structure from being separated is arranged on the sheet metal fixing bottom plate, and a synchronous control structure is arranged between the plurality of lock tongue sliding block assemblies on the same side.

[0008] Further, the independent print head assembly comprises a mainboard and a print head, a wire is connected between the mainboard and the print head for communication connection, and a motor gear assembly is arranged on one side of the print head.

[0009] Further, the plastic shell is made of ABS material, PC material, PP material or PS material.

[0010] Further, the plastic shell comprises a lower cover and an upper cover, and a screw connection assembly is arranged between the lower cover and the upper cover for fixed connection.

[0011] Further, the print head comprises two brackets arranged at intervals left and right, a rubber roller is arranged between the two brackets, a thermal sensitive sheet assembly is arranged below the rubber roller, a hole position for mounting one end of the rubber roller is arranged on the inner wall of the bracket, a waist-shaped hole is arranged on the two sides of the thermal sensitive sheet assembly, and a waist-shaped protruding part for positioning and mounting the waist-shaped hole is arranged on the inner wall of the bracket; a paper port guide plate is further included, a V-shaped groove and a strip-shaped protruding part for supporting the paper port guide plate are arranged on the inner wall of the bracket, a bottom plate is arranged between the two brackets, and a spring assembly capable of pressing the rubber roller is arranged on the bottom plate.

[0012] Further, the bolt positioning structure comprises four positioning holes arranged at four corners of the sheet metal fixing bottom plate.

[0013] Further, the bolt positioning structure comprises positioning holes arranged at the corners of the sheet metal fixing bottom plate, and positioning pins are arranged at the corners of the independent print head assembly, and the positioning pins are correspondingly inserted into one of the positioning holes.

[0014] Further, the lock tongue sliding block assembly comprises a longitudinal guide groove arranged on one side of the positioning hole, a sliding block movably arranged in the longitudinal guide groove, a lock tongue piece arranged on the sliding block, and a lock tongue groove arranged on the circumferential surface of the positioning pin, and the lock tongue piece can be transversely inserted into the corresponding lock tongue groove.

[0015] Further, the lock tongue slot side wall is provided with a pressing slope, which is gradually pressed when the lock tongue piece moves longitudinally towards the lock tongue slot.

[0016] Further, the synchronous control structure comprises a rotating shaft mounting seat arranged between the two sliders on the same side, a longitudinal rotating shaft is arranged in the rotating shaft mounting seat, the longitudinal rotating shaft is provided with a positive thread and a reverse thread at two ends respectively, a positive screw sleeve and a reverse screw sleeve are arranged on the two sliders respectively, the positive screw sleeve is sleeved on the longitudinal rotating shaft and is in threaded connection with the positive thread, and the reverse screw sleeve is sleeved on the longitudinal rotating shaft and is in threaded connection with the reverse thread.

[0017] To sum up, the present application has the following advantages compared with the prior art: The present application solves the problems existing in the prior art of printer. The present application has the following advantages. The present application uses a plastic shell instead of a die casting shell, which greatly reduces the weight of the whole machine and improves portability. The processing cost of the plastic material is much lower than that of the die casting, which effectively controls the product cost and enhances market competitiveness. By arranging a metal fixed bottom plate in the plastic shell, the metal part provides stable support for the independent print head assembly due to its high strength and low deformation, avoiding the deformation of the plastic shell affecting the position of the print head assembly. At the same time, the cooperation of the latch bolt positioning structure, the lock tongue slider assembly and the synchronous control structure realizes the precise positioning and stable locking of the independent print head assembly, ensuring the parallelism and coincidence of the rubber roller and the thermal sensitive sheet assembly, and significantly improving the printing quality. The plastic shell adopts a split design of lower cover and upper cover, the synchronous control structure can realize synchronous operation of the lock tongue slider assembly, and the independent print head assembly is convenient to assemble, disassemble and maintain, which reduces the operation difficulty and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a perspective view of the present application; Figure 2 It is one of internal structure exploded views of the present application; Figure 3 It is the second internal structure exploded view of the present application; Figure 4 It is an internal structure perspective view of the present application; Figure 5 It is a complete print head perspective view of the present application; Figure 6 It is a bottom perspective view of the present application; Figure 7 It is a sectional view of the present application; Figure 8 It is a connection front view of the independent print head assembly and the metal fixed bottom plate of the present application; Figure 9Figure 6 is a bottom view of the independent print head assembly and the sheet metal fixing base plate of the present application; Figure 10 Figure 7 is a perspective view of the independent print head assembly and the sheet metal fixing base plate of the present application; Figure 9 Figure 8 is a partial enlarged view of A of the independent print head assembly and the sheet metal fixing base plate of the present application; Figure 11 Figure 9 is a perspective view of the independent print head assembly and the sheet metal fixing base plate of the present application; Figure 10 Figure 10 is a perspective view of the independent print head assembly and the sheet metal fixing base plate of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0020] Please refer to Figures 1-10 The present application provides a light and stable A3 printer, which comprises an independent print head assembly 1 and a plastic shell 2. The plastic shell 2 is provided with a sheet metal fixing base plate 3. The sheet metal fixing base plate 3 and the plastic shell 2 are provided with a screw connection structure 4. The independent print head assembly 1 is installed on the sheet metal fixing base plate 3. The sheet metal fixing base plate 3 and the independent print head assembly 1 are provided with a plurality of bolt positioning structures 5. The sheet metal fixing base plate 3 is provided with a lock tongue sliding block assembly 6 for limiting the bolt positioning structure 5 from being separated. The same side of the plurality of lock tongue sliding block assemblies 6 is provided with a synchronous control structure 7.

[0021] The plastic shell 2 is fixed to the sheet metal fixing base plate 3 through the screw connection structure 4. The sheet metal fixing base plate 3 provides a stable installation reference for the independent print head assembly 1 by using the low deformation and high strength characteristics of the sheet metal, so as to avoid the influence of the deformation of the plastic shell 2 on the position of the assembly and lay a foundation for stable printing.

[0022] The independent print head assembly 1 is preliminarily and accurately positioned by inserting the positioning pin 502 of the four bolt positioning structures 5 into the positioning hole 501 of the sheet metal fixing base plate 3. The longitudinal shaft 702 of the synchronous control structure 7 is rotated, and the positive screw thread 703 and the reverse screw thread 704 at both ends of the longitudinal shaft 702 respectively drive the sliding block 602 connected by the positive screw sleeve 705 and the reverse screw sleeve 706 to move synchronously along the longitudinal guide groove 601, so that the lock tongue piece 603 is inserted into the lock tongue slot 604 of the positioning pin 502, the gap is eliminated by the pressing inclined surface 6041 matched with the lock tongue slot 604, and the stable locking of the independent print head assembly 1 is completed.

[0023] The motor gear assembly 104 of the independent print head assembly 1 provides power to drive the rubber roller 200 of the print head 102 to rotate. The main board 101 transmits control signals to the print head 102 through the wire 103 to control the work of the thermal sensitive sheet assembly 300.

[0024] The rubber roller 200 rotates under the drive of the motor gear assembly 104, the paper is supported by the V-shaped groove 800 and the strip-shaped protruding part 900 of the support 100 to prevent deformation, enters the printing head 102, the spring assembly 1100 of the bottom plate 1000 compresses the rubber roller 200, the rubber roller 200 is tightly combined with the thermal sheet assembly 300, the thermal sheet assembly 300 generates heat according to a signal, and the printing content is formed on the paper, and finally, the A3 size printing is completed.

[0025] The independent printing head assembly 1 comprises a main plate 101 and a printing head 102, a wire 103 is connected between the main plate 101 and the printing head 102 for communication connection, and the printing head 102 is provided with a motor gear assembly 104 on one side.

[0026] The plastic shell 2 is made of ABS material, PC material, PP material or PS material.

[0027] The plastic shell 2 comprises a lower cover 201 and an upper cover 202, and a screw connection assembly 203 is arranged between the lower cover 201 and the upper cover 202 for fixed connection.

[0028] The printing head 102 comprises two supports 100 which are arranged at intervals left and right, a rubber roller 200 is arranged between the two supports 100, a thermal sheet assembly 300 is arranged below the rubber roller 200, a hole position 400 for mounting one end of the rubber roller 200 is arranged on the inner wall of the support 100, a waist-shaped hole 500 is arranged on the two sides of the thermal sheet assembly 300, a waist-shaped protruding part 600 for positioning and mounting the waist-shaped hole 500 is arranged on the inner wall of the support 100, a paper port guide plate 700 is further included, a V-shaped groove 800 and a strip-shaped protruding part 900 for supporting the paper port guide plate 700 are arranged on the inner wall of the support 100, a bottom plate 1000 is arranged between the two supports 100, and a spring assembly 1100 for compressing the rubber roller 200 is arranged on the bottom plate 1000.

[0029] The bolt positioning structure 5 comprises four positioning holes 501 arranged at four corners of the sheet metal fixing bottom plate 3.

[0030] The bolt positioning structure 5 comprises positioning holes 501 arranged at the corners of the sheet metal fixing bottom plate 3, positioning pins 502 are arranged at the corners of the independent printing head assembly 1, and the positioning pins 502 are correspondingly inserted into one of the positioning holes 501.

[0031] The lock tongue sliding block assembly 6 comprises a longitudinal guide groove 601 arranged on one side of the positioning hole 501, a sliding block 602 movably arranged in the longitudinal guide groove 601, and a lock tongue piece 603 arranged on the sliding block 602.

[0032] The sidewall of the lock tongue slot 604 is provided with a pressing inclined surface 6041, and the lock tongue piece 603 gradually presses the pressing inclined surface 6041 when moving longitudinally towards the lock tongue slot 604.

[0033] The synchronous control structure 7 comprises a rotating shaft mounting seat 701 arranged between the two sliding blocks 602 on the same side, a longitudinal rotating shaft 702 rotatably arranged in the rotating shaft mounting seat 701, a right screw thread 703 and a reverse screw thread 704 arranged at two ends of the longitudinal rotating shaft 702 respectively, a right screw sleeve 705 and a reverse screw sleeve 706 arranged on the two sliding blocks 602 respectively, the right screw sleeve 705 being sleeved on the longitudinal rotating shaft 702 and being in threaded connection with the right screw thread 703, and the reverse screw sleeve 706 being sleeved on the longitudinal rotating shaft 702 and being in threaded connection with the reverse screw thread 704.

[0034] The basic principle and main features of the present application and the advantages of the present application are shown and described above, and those skilled in the art should understand that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A compact and stable A3 printer, characterized in that: The application relates to an independent printing head assembly (1) and a plastic shell (2), a sheet metal fixing bottom plate (3) is arranged in the plastic shell (2), a screw connecting structure (4) is arranged between the sheet metal fixing bottom plate (3) and the plastic shell (2), the independent printing head assembly (1) is mounted on the sheet metal fixing bottom plate (3), a plurality of bolt positioning structures (5) are arranged between the sheet metal fixing bottom plate (3) and the independent printing head assembly (1), a lock tongue sliding block assembly (6) for limiting the bolt positioning structure (5) from being separated is arranged on the sheet metal fixing bottom plate (3), and a synchronous control structure (7) is arranged between a plurality of the lock tongue sliding block assemblies (6) on the same side.

2. A compact and stable A3 printer according to claim 1, characterized in that: The independent printing head assembly (1) comprises a main plate (101) and a printing head (102), a wire (103) is connected between the main plate (101) and the printing head (102) for communication connection, and a motor gear assembly (104) is arranged on one side of the printing head (102).

3. A compact and stable A3 printer according to claim 2, characterized in that: The plastic shell (2) is made of ABS material, PC material, PP material or PS material.

4. The light and stable A3 printer according to claim 3, characterized in that: The plastic shell (2) comprises a lower cover (201) and an upper cover (202), and a screw connecting assembly (203) is arranged between the lower cover (201) and the upper cover (202) for fixed connection.

5. A compact and stable A3 printer according to claim 4, characterized in that: The printing head (102) comprises two brackets (100) arranged at intervals left and right, a rubber roller (200) is arranged between the two brackets (100), a heat-sensitive sheet assembly (300) is arranged below the rubber roller (200), a hole site (400) for mounting one end of the rubber roller (200) is arranged on the inner wall of the bracket (100), a waist-shaped hole (500) is arranged on the two sides of the heat-sensitive sheet assembly (300), a waist-shaped convex part (600) for positioning and mounting the waist-shaped hole (500) is arranged on the inner wall of the bracket (100), a paper port guide plate (700) is further arranged, a V-shaped groove (800) and a strip-shaped convex part (900) for supporting the paper port guide plate (700) are arranged on the inner wall of the bracket (100), a bottom plate (1000) is arranged between the two brackets (100), and a spring assembly (1100) capable of pressing the rubber roller (200) is arranged on the bottom plate (1000).

6. A compact and stable A3 printer according to claim 5, characterized in that: The bolt positioning structure (5) comprises four positioning holes (501) arranged at four corners of the sheet metal fixing bottom plate (3).

7. The light and stable A3 printer according to claim 5, characterized in that: The bolt positioning structure (5) comprises positioning holes (501) arranged at the corners of the sheet metal fixing bottom plate (3), positioning pins (502) are arranged at the corners of the independent printing head assembly (1), and the positioning pins (502) are correspondingly inserted into one of the positioning holes (501).

8. The light and stable A3 printer according to claim 7, characterized in that: The lock tongue slider assembly (6) comprises a longitudinal guide slot (601) arranged on one side of the positioning hole (501), a slider (602) movably arranged in the longitudinal guide slot (601), a lock tongue piece (603) arranged on the slider (602), and a lock tongue slot (604) arranged on the circumferential surface of the positioning pin (502), wherein the lock tongue piece (603) can be transversely inserted into the corresponding lock tongue slot (604).

9. The light and stable A3 printer according to claim 8, characterized in that: The sidewall of the lock tongue slot (604) is provided with a pressing inclined surface (6041), and the lock tongue piece (603) gradually presses the pressing inclined surface (6041) when moving longitudinally towards the lock tongue slot (604).

10. The light and stable A3 printer according to claim 9, characterized in that: The synchronous control structure (7) comprises a rotating shaft mounting seat (701) arranged between two sliders (602) on the same side, a longitudinal rotating shaft (702) rotatably arranged in the rotating shaft mounting seat (701), a right thread (703) and a reverse thread (704) arranged at two ends of the longitudinal rotating shaft (702) respectively, a right screw sleeve (705) and a reverse screw sleeve (706) arranged on the two sliders (602) respectively, the right screw sleeve (705) being sleeved on the longitudinal rotating shaft (702) and being in threaded connection with the right thread (703), and the reverse screw sleeve (706) being sleeved on the longitudinal rotating shaft (702) and being in threaded connection with the reverse thread (704).

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