Printer

Abstract

The utility model provides a printer which comprises an upper shell, a lower shell, a printing head assembly, a circuit board assembly, a motor assembly and a rubber roller assembly, an upper paper roll groove is formed in the inner side of the upper shell, a lower paper roll groove is formed in the inner side of the lower shell, and the upper paper roll groove and the lower paper roll groove can be vertically and oppositely spliced to form a paper roll groove. The printing head assembly and the rubber roller assembly are both located on the front side of the paper roll groove, a reverse crankshaft is arranged in the paper roll groove in the axial direction, and the reverse crankshaft is used for enabling printing paper on a printing paper roll to be inserted between the printing head assembly and the rubber roller assembly after being wound around the reverse crankshaft in the direction opposite to the curling direction generated on the printing paper. According to the printer, printing paper can be effectively flattened, indentations cannot be generated on the paper, resistance to the paper is not large, and a high-power motor assembly does not need to be replaced on the basis of conventional power.

Description

Technical Field

[0001] This utility model relates to the technical field of printing equipment, and more specifically to a printer. Background Technology

[0002] Thermal printers typically use wide-width rolls of paper, which are prone to curling at the edges. As the paper rolls are used up, their outer diameter decreases, causing the printed paper to become increasingly curled, negatively impacting the user experience. Existing technologies have implemented some measures to flatten the printing paper, but these either result in poor flattening, create indentations on the paper, or create excessive resistance, significantly increasing the load on the motor during paper feeding and necessitating the replacement with a more powerful and costly motor. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a printer that can effectively flatten roll printing paper, without creating indentations on the paper, with little resistance to the paper, and without requiring the replacement of a high-power motor.

[0004] The technical solution of this utility model is to provide a printer, including an upper housing, a lower housing, a printhead assembly, a circuit board assembly, a motor assembly, and a rubber roller assembly. An upper paper roll groove is provided inside the upper housing, and a lower paper roll groove is provided inside the lower housing. The upper and lower paper roll grooves can be joined together vertically to form a paper roll groove. The paper roll groove is used to hold the printing paper roll. The circuit board assembly is electrically connected to both the printhead assembly and the motor assembly. The motor assembly drives the rubber roller assembly to externally convey the printing paper from the printing paper roll. The printhead assembly and the rubber roller assembly are both located in front of the paper roll groove. A counter-curved shaft is axially arranged inside the paper roll groove. The counter-curved shaft allows the printing paper on the printing paper roll to pass around the counter-curved shaft in the opposite direction to the curling direction of the printing paper before being inserted between the printhead assembly and the rubber roller assembly.

[0005] Compared with the prior art, the printer of this utility model has the following advantages: the paper roll is placed in the paper roll slot, so that the paper output end of the paper roll is located at the bottom of the paper roll. Then, the paper output end is moved upward and backward through the underside of the anti-curved shaft, then around to the top of the anti-curved shaft, and then inserted between the print head assembly and the rubber roller assembly. In this way, when the rubber roller assembly drives the paper on the paper roll to output, the anti-curved shaft can apply a force to the paper in the opposite direction to the curl generated on the paper, so that the paper is flattened before output. The anti-curved shaft can be set to have a smooth surface, which can effectively flatten the paper without creating indentations on the paper, and the resistance to the paper is not large. It does not require replacing the motor assembly with a high-power one based on the conventional power.

[0006] Preferably, the lower paper roll slot is provided with two paper stoppers positioned opposite each other, with the space between the two paper stoppers used to place the printing paper roll. Each of the two paper stoppers is provided with a reverse-curved shaft guide groove, one end of which is located in front of the lower paper roll slot, and the other end is provided with a limiting part located above or behind the lower paper roll slot. The two ends of the reverse-curved shaft are respectively movably connected to the two reverse-curved shaft guide grooves, and the reverse-curved shaft can move along one end of the reverse-curved shaft guide groove to the other end and be limited by the limiting part. With this structure, before placing the printing paper roll, the reverse-curved shaft can be pulled down so that it is located in front of the lower paper roll slot, avoiding obstruction of the printing paper roll being placed into the lower paper roll slot. After placing the printing paper roll, the reverse-curved shaft can be raised so that it is located above or behind the printing paper roll and is limited by the limiting part. In this way, the curvature of the printing paper surrounding the reverse-curved shaft is increased in the opposite direction to the curling direction of the printing paper, which can enhance the effect of the reverse-curved shaft in flattening the printing paper.

[0007] Preferably, the limiting part is a groove with an inner diameter smaller than the outer diameter of the reverse crankshaft, and the reverse crankshaft is inserted into the limiting part with an interference fit. With this structure, it is only necessary to lift the reverse crankshaft with force to insert it into the limiting part, which can reliably limit the reverse crankshaft, making operation convenient and preventing the reverse crankshaft from shifting during the printing process.

[0008] Preferably, a rack is provided on the groove wall of the reverse crankshaft guide groove, and gear rings are provided at both ends of the reverse crankshaft, with the gear rings meshing with the rack. With this structure, rotating the reverse crankshaft can change its position within the reverse crankshaft guide groove, and the reverse crankshaft can be limited by the reverse crankshaft guide groove whenever rotation stops, meaning the reverse crankshaft guide groove has no limit position for the reverse crankshaft.

[0009] Preferably, the paper stop is sheet-shaped, and the lower paper roll groove is provided with several paper stop limiting grooves. The paper stop can be inserted into any one of the paper stop limiting grooves and be limited therein. With this structure, the position of the paper stop can be adjusted according to the width of the printing paper roll to accommodate printing paper rolls of different sizes and specifications, thereby increasing the applicability of the printer of this utility model.

[0010] Preferably, both paper stoppers are provided with deformable arms above the counter-crankshaft guide groove. The deformable arms are S-shaped and elastic, with one S-bend on the deformable arm located above the lower paper roll groove and the other S-bend located in front of the lower paper roll groove. The counter-crankshaft guide groove is arranged along the shape of the deformable arm. With this structure, the deformable arms are elastic, facilitating the insertion of the counter-crankshaft into the counter-crankshaft guide groove.

[0011] Preferably, the reverse-curved shaft is located in the upper paper roll slot, with its two ends connected to the two end faces of the upper paper roll slot. With this structure, the printing paper roll can be placed into the lower paper roll slot by opening the upper housing, and it is also convenient to move the paper output end from below the reverse-curved shaft to above the reverse-curved shaft. Closing the upper housing allows the reverse-curved shaft to be positioned above or behind the printing paper roll.

[0012] Preferably, the upper and lower housings are rotatably openable and closeable, and a housing pivot is provided on the outer side of the lower paper roll groove on the lower housing, with the upper and lower housings hinged together via the housing pivot. This structure facilitates the opening and closing of the upper and lower housings.

[0013] Preferably, the printhead assembly is mounted on the upper housing, while the roller assembly and motor assembly are both mounted on the lower housing. The lower housing has hook assemblies at both ends of the roller assembly, and the upper housing has latches at both ends of the printhead assembly. The hook assemblies and latches are detachably connected. This structure facilitates locking the upper and lower housings, ensuring that both the printhead assembly and roller assembly are in contact with the printing paper, thus enabling normal printing and paper feeding.

[0014] Preferably, the latch assembly includes a latch, a compression spring, and a latch shaft. The middle part of the latch is rotatably connected to the lower housing via the latch shaft, and the lower part of the latch is elastically connected to the lower housing via the compression spring. Pressing the latch with the upper housing causes the latch to rotate into the corresponding latch slot and compress the compression spring. The spring's rebound causes the latch to rotate in the opposite direction and engage with the corresponding latch slot. With this structure, directly pressing the upper housing engages the upper and lower housings, and pressing the upper housing again disengages them, making paper changing convenient.

[0015] Preferably, a hook drive shaft is provided between the hooks of the two sets of hook assemblies. Each hook has a shaft limiting hole at its lower part, and both ends of the hook drive shaft are respectively inserted into the corresponding shaft limiting holes, which circumferentially limit the movement of the hook drive shaft. With this structure, the hook drive shaft ensures synchronous operation of the hooks in the two sets of hook assemblies.

[0016] Preferably, the lower housing is further provided with a gear assembly, and the motor assembly drives the rubber roller assembly through the gear assembly. The rubber roller assembly includes a rubber roller and a rubber roller pressure plate. One end of the rubber roller is meshed with the gear assembly, and the other end is connected to the rubber roller pressure plate. This structure is simple and the transmission is reliable.

[0017] Preferably, a paper tearing blade is provided on the upper housing at the front end of the printhead assembly. This structure facilitates the tearing off of printed paper. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the printer of embodiment 1 of this utility model in the open state.

[0019] Figure 2 This is a schematic diagram of the printer of embodiment 1 of this utility model in the closed state.

[0020] Figure 3 This is a cross-sectional view of Embodiment 1 of the printer of this utility model in the closed state.

[0021] Figure 4 This is a schematic diagram of the structure of Embodiment 1 of the printer of this utility model in the empty paper roll slot.

[0022] Figure 5 This is a schematic diagram of the top structure of Embodiment 1 of the printer of this utility model.

[0023] Figure 6 This is a schematic diagram of the bottom structure of Embodiment 1 of the printer of this utility model.

[0024] Figure 7 This is a schematic diagram of the printer of embodiment 2 of this utility model in the open state.

[0025] Figure 8 This is a cross-sectional view of Embodiment 2 of the printer of this utility model in the closed state.

[0026] As shown in the figure: 1. Upper housing, 1-1. Upper paper roll groove, 2. Lower housing, 2-1. Lower paper roll groove, 2-2. Paper stop limiting groove, 3. Print head assembly, 4. Paper tearing knife, 5. Circuit board assembly, 6. Motor assembly, 7. Rubber roller assembly, 7-1. Rubber roller, 7-2. Rubber roller pressure plate, 7-3. Gear assembly, 8. Hook assembly, 8-1. Hook, 8-2. Compression spring, 8-3. Hook drive shaft, 8-4. Shaft limiting hole, 8-5. Hook rotating shaft, 9. Reverse crankshaft, 10. Paper stop component, 10-1. Deformable arm, 10-2. Reverse crankshaft guide groove, 10-3. Limiting part, 11. Housing rotating shaft, 12. Printing paper roll, 12-1. Paper output end. Detailed Implementation

[0027] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0028] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0029] It should also be understood that the terms "comprising," "having," "including," and "containing," when used in this specification, indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. Furthermore, when expressions such as "...at least one" appear after a list of listed features, they modify the entire listed feature, not individual elements in the list.

[0030] Example 1:

[0031] like Figures 1 to 6 As shown, the printer of this utility model includes an upper housing 1, a lower housing 2, a printhead assembly 3, a circuit board assembly 5, a motor assembly 6, a rubber roller assembly 7, and a gear assembly 7-3. The upper housing 1 and the lower housing 2 are rotatably openable and closeable. A housing pivot 11 is provided on the outer side of the lower paper roll groove 2-1 on the lower housing 2, and the upper housing 1 and the lower housing 2 are hinged through the housing pivot 11. An upper paper roll groove 1-1 is provided on the inner side of the upper housing 1, and a lower paper roll groove 2-1 is provided on the inner side of the lower housing 2. The upper paper roll groove 1-1 and the lower paper roll groove 2-1 can be assembled vertically to form a paper roll groove, which is used to hold the printing paper roll 12. The printhead assembly 3 and the rubber roller assembly 7 are both located in front of the paper roll groove. The printhead assembly 3 is provided on the upper housing 1, and a paper tearing blade 4 is also provided on the front end of the printhead assembly 3 on the upper housing 1. The rubber roller assembly 7 and the motor assembly 6 are both provided on the lower housing 2. The circuit board assembly 5 is electrically connected to the printhead assembly 3 and the motor assembly 6. The motor assembly 6 drives the rubber roller assembly 7 to externally convey the printing paper on the printing paper roll 12 through the gear assembly 7-3. The rubber roller assembly 7 includes a rubber roller 7-1 and a rubber roller pressure plate 7-2. One end of the rubber roller 7-1 is meshed with the gear assembly 7-3, and the other end is connected to the rubber roller pressure plate 7-2.

[0032] The lower housing 2 is provided with hook assemblies 8 at both ends of the roller assembly 7, and the upper housing 1 is provided with bayonets at both ends of the printhead assembly 3. The hook assembly 8 includes a hook 8-1, a compression spring 8-2, a hook rotating shaft 8-5, and a hook drive shaft 8-3. The middle part of the hook 8-1 is rotatably connected to the lower housing 2 through the hook rotating shaft 8-5, and the lower part of the hook 8-1 is elastically connected to the lower housing 2 through the compression spring 8-2. A hook drive shaft 8-3 is provided between the hooks 8-1 of the two sets of hook assemblies 8. The lower part of the hook 8-1 is provided with a shaft limiting hole 8-4. The two ends of the hook drive shaft 8-3 are respectively inserted into the corresponding shaft limiting hole 8-4, and the shaft limiting hole 8-4 limits the hook drive shaft 8-3 circumferentially. The upper housing 1 presses the hook 8-1, which causes the hook 8-1 to rotate into the corresponding slot and compress the compression spring 8-2. The spring 8-2 rebounds, which causes the hook 8-1 to rotate in the opposite direction and snap into the corresponding slot. The hook drive shaft 8-3 ensures that the hooks 8-1 of the two sets of hook assemblies 8 move synchronously.

[0033] like Figure 4 As shown, two paper-blocking components 10 are provided in the lower paper roll slot 2-1, which are spaced apart from each other. The space between the two paper-blocking components 10 is used to place the printing paper roll 12. The paper-blocking components 10 are sheet-shaped. Several paper-blocking limiting slots 2-2 are provided in the lower paper roll slot 2-1. The paper-blocking component 10 can be inserted into any one of the paper-blocking limiting slots 2-2 and be limited.

[0034] Both paper stoppers 10 are provided with a reverse crankshaft guide groove 10-2. Above the reverse crankshaft guide groove 10-2, each of the two paper stoppers 10 has a deformable arm 10-1. The deformable arm 10-1 is S-shaped and elastic. One S-bend of the deformable arm 10-1 is located above the lower paper roll groove 2-1, and the other S-bend is located in front of the lower paper roll groove 2-1. The reverse crankshaft guide groove 10-2 is arranged along the shape of the deformable arm 10-1, that is, one end of the reverse crankshaft guide groove 10-2 is located in the lower paper roll groove. At the front of 2-1, a limiting part 10-3 is provided at the other end. The limiting part 10-3 is located above or behind the lower paper roll groove 2-1. The two ends of the reverse crankshaft 9 are respectively movably connected in two reverse crankshaft guide grooves 10-2. The reverse crankshaft 9 can move along one end of the reverse crankshaft guide groove 10-2 to the other end and be limited by the limiting part 10-3. The limiting part 10-3 is a groove with an inner diameter smaller than the outer diameter of the reverse crankshaft 9. The reverse crankshaft 9 is embedded in the limiting part 10-3 and is interference-fitted with the limiting part 10-3.

[0035] When placing the printing paper roll 12, the printer of this utility model can first pull down the anti-crankshaft 9 so that the anti-crankshaft 9 is in front of the lower paper roll slot 2-1, so as to avoid the anti-crankshaft 9 obstructing the printing paper roll 12 from being placed into the lower paper roll slot 2-1. When placing the printing paper roll 12, the paper output end 12-1 of the printing paper roll 12 is located at the bottom of the printing paper roll 12. After placing the printing paper roll 12, the anti-crankshaft 9 is raised so that the anti-crankshaft 9 is above or behind the printing paper roll 12, and the anti-crankshaft 9 is forcefully embedded into the limiting part 10-3 to reliably limit the anti-crankshaft 9. Then, the paper output end 12-1 is made to go upward and backward through the lower part of the anti-crankshaft 9, and then around to the upper part of the anti-crankshaft 9, and then inserted between the print head assembly 3 and the rubber roller assembly 7. At this time, the curvature of the printing paper surrounding the anti-crankshaft 9 increases in the opposite direction to the curling direction generated on the printing paper.

[0036] Afterwards, pressing the upper housing 1 will cause the upper housing 1 and the lower housing 2 to snap together, at which point the printer of this utility model can start printing. When the rubber roller assembly 7 drives the printing paper roll 12 to output the printing paper, the anti-crank shaft 9 can apply force to the printing paper in the opposite direction to the curl generated on the printing paper, so that the printing paper is flattened before output; the greater the curvature of the printing paper surrounding the anti-crank shaft 9 in the opposite direction to the curl generated on the printing paper, the better the effect of the anti-crank shaft 9 in flattening the printing paper; the anti-crank shaft 9 can be set to have a smooth surface, which can effectively flatten the printing paper without creating indentations on the paper, and the resistance to the paper is not large, so there is no need to replace the high-power motor assembly 6 with the conventional power.

[0037] Example 2:

[0038] The printer in this embodiment differs from that in Embodiment 1 in that a rack is provided on the groove wall of the reverse crankshaft guide groove 10-2, and a gear ring is provided at both ends of the reverse crankshaft 9. The gear ring is meshed with the rack. Thus, rotating the reverse crankshaft 9 can change the position of the reverse crankshaft 9 in the reverse crankshaft guide groove 10-2. Moreover, whenever the rotation of the reverse crankshaft 9 is stopped, the rack can limit the gear ring, that is, the reverse crankshaft 9 can be limited by the reverse crankshaft guide groove 10-2, so that the reverse crankshaft guide groove 10-2 has no limit position on the reverse crankshaft 9.

[0039] Example 3:

[0040] The difference between the printer in this embodiment and that in embodiment 1 is that the reverse crankshaft 9 is disposed within the upper paper roll slot 1-1, as shown below. Figure 7 and Figure 8 As shown, the two ends of the reverse crankshaft 9 are respectively connected to the two end faces of the upper paper roll slot 1-1. Thus, opening the upper housing 1 allows the printing paper roll 12 to be placed into the lower paper roll slot 2-1. It is also convenient to move the paper output end 12-1 from below the reverse crankshaft 9 to above the reverse crankshaft 9. Closing the upper housing 1 allows the reverse crankshaft 9 to be positioned above or behind the printing paper roll 12.

[0041] The above are merely specific embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Any modifications or equivalent substitutions to this utility model without departing from its spirit and scope should be covered within the protection scope of the claims of this utility model.

Claims

1. A printer, comprising an upper housing (1), a lower housing (2), a printhead assembly (3), a circuit board assembly (5), a motor assembly (6), and a rubber roller assembly (7), wherein an upper paper roll groove (1-1) is provided on the inner side of the upper housing (1), and a lower paper roll groove (2-1) is provided on the inner side of the lower housing (2), the upper paper roll groove (1-1) and the lower paper roll groove (2-1) can be joined together vertically to form a paper roll groove, wherein the paper roll groove is used to hold a printing paper roll (12), the circuit board assembly (5) is electrically connected to both the printhead assembly (3) and the motor assembly (6), and the motor assembly (6) is used to drive the rubber roller assembly (7) to externally convey the printing paper on the printing paper roll (12), characterized in that, The printing head assembly (3) and the rubber roller assembly (7) are located at the front side of the paper roll groove, and the paper roll groove is provided with a reverse shaft (9) in the axial direction, which is used to make the printing paper on the printing paper roll (12) pass through the reverse shaft (9) in the direction opposite to the curling direction of the printing paper roll (12) and then be inserted between the printing head assembly (3) and the rubber roller assembly (7).

2. The printer of claim 1, wherein, The lower paper roll groove (2-1) is provided with two paper blocking pieces (10) opposite to each other, and the space between the two paper blocking pieces (10) is used to place the printing paper roll (12). The two paper blocking pieces (10) are provided with reverse shaft guide grooves (10-2) respectively, one end of the reverse shaft guide groove (10-2) is located at the front of the lower paper roll groove (2-1), and the other end is provided with a limiting portion (10-3) located above or rear above the lower paper roll groove (2-1). The two ends of the reverse shaft (9) are movably connected in the two reverse shaft guide grooves (10-2) respectively, and the reverse shaft (9) can move from one end of the reverse shaft guide groove (10-2) to the other end and be limited by the limiting portion (10-3).

3. The printer of claim 2, wherein, The limiting portion (10-3) is a groove with an inner diameter smaller than the outer diameter of the reverse shaft (9), and the reverse shaft (9) is embedded in the limiting portion (10-3) and is in interference fit with the limiting portion (10-3).

4. The printer of claim 2, wherein, The groove wall of the reverse shaft guide groove (10-2) is provided with a rack, and the two ends of the reverse shaft (9) are provided with gear rings, and the gear ring is engaged with the rack.

5. The printer of claim 2, wherein, The paper blocking piece (10) is in the form of a sheet, and the lower paper roll groove (2-1) is provided with a plurality of paper blocking limiting grooves (2-2), and the paper blocking piece (10) can be inserted into any one of the paper blocking limiting grooves (2-2) and be limited.

6. The printer of claim 2, wherein, The two paper blocking pieces (10) are provided with deformed arms (10-1) above the reverse shaft guide groove (10-2) respectively, the deformed arm (10-1) is in the shape of S and has elasticity, one S bend of the deformed arm (10-1) is located above the lower paper roll groove (2-1), and the other S bend is located in front of the lower paper roll groove (2-1), and the reverse shaft guide groove (10-2) is arranged along the shape of the deformed arm (10-1).

7. The printer of claim 1, wherein, The reverse shaft (9) is arranged in the upper paper roll groove (1-1), and the two ends of the reverse shaft (9) are connected to the two end faces of the upper paper roll groove (1-1) respectively.

8. The printer according to any one of claims 1 to 7, characterized by, The upper shell (1) and the lower shell (2) can be opened and closed, and the lower shell (2) is provided with a shell rotating shaft (11) on the outer side of the lower paper roll groove (2-1), and the upper shell (1) and the lower shell (2) are hinged through the shell rotating shaft (11).

9. The printer of claim 8, wherein, The printing head assembly (3) is arranged on the upper shell (1), the rubber roller assembly (7) and the motor assembly (6) are arranged on the lower shell (2), the lower shell (2) is provided with a hook assembly (8) on both ends of the rubber roller assembly (7), and the upper shell (1) is provided with a clamping hole on both ends of the printing head assembly (3), and the hook assembly (8) and the clamping hole are detachably connected.

10. The printer of claim 9, wherein, The hook assembly (8) comprises a hook (8-1), a compression spring (8-2), and a hook rotating shaft (8-5). The middle part of the hook (8-1) is rotatably connected to the lower shell (2) through the hook rotating shaft (8-5), and the lower part of the hook (8-1) is elastically connected to the lower shell (2) through the compression spring (8-2). The upper shell (1) presses the hook (8-1) to make the hook (8-1) rotate into the corresponding socket and compress the compression spring (8-2). The elastic recovery of the compression spring (8-2) can make the hook (8-1) rotate reversely and be buckled with the corresponding socket.

11. The printer of claim 10, wherein, The hooks (8-1) of the two groups of hook assemblies (8) are provided with a hook transmission shaft (8-3), and the lower part of each hook (8-1) is provided with an axis limiting hole (8-4). The two ends of the hook transmission shaft (8-3) are respectively inserted into the corresponding axis limiting holes (8-4), and the axis limiting holes (8-4) limit the hook transmission shaft (8-3) circumferentially.

12. The printer of claim 9, wherein, The lower shell (2) is also provided with a gear assembly (7-3), and the motor assembly (6) drives the rubber roller assembly (7) through the gear assembly (7-3). The rubber roller assembly (7) comprises a rubber roller (7-1) and a rubber roller pressing plate (7-2). One end of the rubber roller (7-1) is meshingly connected with the gear assembly (7-3), and the other end is connected with the rubber roller pressing plate (7-2).

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