Paper flipping mechanism and printer

Abstract

This invention provides a paper flipping mechanism and printer, belonging to the field of printing technology. It includes a frame, a flipping conveyor group, a flipping clamping group, and a paper feeder. The flipping conveyor group includes a flipping conveyor belt and flipping slave conveyor rollers and a flipping main conveyor roller supported on the frame. The flipping conveyor belt wraps around the upper and lower staggered flipping main conveyor rollers and flipping slave conveyor rollers, forming an inclined conveying mechanism. The flipping clamping group, as a key component to avoid paper wrinkles and paper jams, includes a clamping belt and a support roller assembly supported on the frame. The clamping belt wraps around the flipping slave conveyor rollers through the support roller assembly and clamps the flipping conveyor belt. The paper feeder is located below and in front of the flipping slave conveyor rollers and connects to the clamping belt to transport paper between the clamping belt and the flipping conveyor belt. This invention features a clamping belt that can both wrap around the flipping slave conveyor rollers and clamp the flipping conveyor belt, thus preventing paper jams and paper wrinkles.

Description

Technical Field

[0001] This utility model belongs to the field of printing technology, specifically relating to a paper flipping mechanism and a printer. Background Technology

[0002] Currently, when flipping double-sided printed paper, the paper passes through the transmission gap between the feed roller and the driven roller, and the distance from the paper to the flipping inflection point is relatively long, which easily leads to paper jams. After the paper changes direction at the flipping inflection point, it enters the flipping constraint gap upwards and is transmitted to the upper conveyor belt. However, due to the short constraint section, paper jams are also prone to occur.

[0003] Therefore, the current paper flipping mechanism has the following problems: when flipping the paper, paper jams or paper wrinkles are likely to occur, affecting the clarity of printing and even causing machine shutdown. Utility Model Content

[0004] This utility model provides a paper flipping mechanism and a printer, which aims to solve the problem of paper jams during paper transfer and flipping.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a paper flipping mechanism, including: a frame, a flipping conveyor group, a flipping clamping group, and a paperboard conveyor; The flipping conveyor assembly includes a flipping conveyor belt and flipping slave conveyor rollers and flipping main conveyor rollers supported on the frame; the flipping conveyor belt is wound around the flipping main conveyor rollers and flipping slave conveyor rollers that are arranged vertically and horizontally in a staggered manner, forming an inclined conveying system; The flipping and pressing assembly includes a pressing belt and a support roller assembly supported on the frame; the pressing belt wraps around the flipping conveyor roller via the support roller assembly and presses the flipping conveyor belt. The paper feeder is positioned below and in front of the flipping conveyor roller and is connected to the pressure belt to transfer the paper between the pressure belt and the flipping conveyor belt.

[0006] In conjunction with the first aspect, in one feasible manner, the flipping conveyor group further includes a flipping tension roller, the flipping tension roller being close to the main flipping conveyor roller, and the flipping tension roller, the main flipping conveyor roller, and the flipping slave conveyor roller being arranged in a triangle; The first inclination formed by the flipping conveyor belt around the flipping tension roller and the flipping main conveyor roller is greater than the second inclination formed by the flipping auxiliary conveyor roller and the flipping tension roller, so as to guide the paper to tend to be horizontal after flipping.

[0007] In conjunction with the first aspect, in one feasible manner, the support roller assembly includes an upper roller, a lower roller, and a lower tension roller; the lower roller is located below and in front of the turning conveyor roller, and the lower tension roller is located below and behind the turning conveyor roller, such that the pressure belt wraps around the turning conveyor roller; the upper roller is close to the turning main conveyor roller, such that the pressure belt presses against the turning conveyor belt.

[0008] In conjunction with the first aspect, in one feasible manner, the support roller assembly further includes an upward tensioning roller that is close to the upper shaft roller and causes the pressure band to be vertical when passing over the lower tensioning roller and the upward tensioning roller, and inclined when passing over the upward tensioning roller and the upper shaft roller.

[0009] In conjunction with the first aspect, in one feasible embodiment, the paper turning mechanism further includes a turning drive assembly, which includes a turning drive motor mounted on the frame, a turning drive wheel connected to the turning drive motor, and a turning driven wheel mounted on the turning main conveyor roller. The turning conveyor belt is driven to rotate by a first transmission belt wound around the turning driven wheel and the turning drive wheel. The main conveyor roller for turning over is also equipped with a tensioning drive roller, and the tensioning roller is driven to rotate by a second transmission belt wound around the tensioning drive roller.

[0010] In conjunction with the first aspect, in one feasible manner, the frame is provided with a tensioning guide wheel for tensioning the second transmission belt.

[0011] In conjunction with the first aspect, in one feasible manner, the flipping and pressing assembly further includes a guide roller disposed on the rear side of the flipping conveyor belt, the guide roller keeping the pressing belt pressed against the flipping conveyor belt.

[0012] In conjunction with the first aspect, in one feasible embodiment, the paper turning mechanism further includes a paper feed roller assembly disposed in front of the turning conveyor roller, the paper feed roller assembly including a paper feed roller located below the paper feed board and a paper feed roller located above the paper feed board, the paper feed roller and the paper feed roller forming a transmission gap before turning; the paper feed board is provided with a clearance window to avoid the paper feed roller and the paper feed roller.

[0013] In conjunction with the first aspect, in one feasible manner, a pressure plate is disposed above the paper feeder, the pressure plate being connected to the frame via a bracket.

[0014] The paper turning mechanism provided by this utility model has the following advantages compared with the prior art: it is equipped with a pressing belt that can both wrap around the turning conveyor roller and press the turning conveyor belt. The lower part of the pressing belt is tangent to the turning conveyor belt and forms an involute with the turning conveyor belt. The paper is conveyed from the paperboard to the pressing belt and enters between the turning conveyor belt and the pressing belt through the inlet. Driven by the turning conveyor belt and pressed by the pressing belt, it can be conveyed flat backward, avoiding paper jams. Moreover, due to the pressing of the pressing belt, the conveyed paper has a flattening function, thus preventing paper wrinkles.

[0015] Secondly, this utility model embodiment also provides a printer, including the aforementioned paper flipping mechanism.

[0016] The printer provided in this embodiment of the utility model adopts a flipping mechanism that can avoid paper jams and wrinkles when flipping the paper, thereby reducing the frequency of equipment downtime and ensuring print clarity, thus improving the printer's performance. Attached Figure Description

[0017] Figure 1 Front view of the paper flipping mechanism provided in this embodiment of the utility model Figure 1 ; Figure 2 A schematic diagram of the flipping conveyor group and flipping clamping group provided in the embodiment of this utility model (the arrows in the figure indicate the paper conveying direction). Figure 3 A three-dimensional structural diagram of the flipping conveyor group and the flipping clamping group provided in the embodiments of this utility model; Figure 4 This is a schematic diagram of the main structure of the compression belt provided in an embodiment of the present utility model; Figure 5 A three-dimensional structural diagram of the paper turning mechanism provided in the embodiment of this utility model (showing the cooperation between the paper feeding roller and the paper conveying roller). Figure 6 A three-dimensional structural diagram of the paper turning mechanism provided in this embodiment of the utility model (showing the paper feed roller installation structure); Figure 7 A front view of the paper flipping mechanism installed on the frame according to an embodiment of the present invention (view from the outside of the frame). Figure 8 A schematic diagram of the main structure of the paper turning mechanism and the upper and lower conveyor belts provided in this embodiment of the utility model; Figure 9 A three-dimensional structural diagram of the paper turning mechanism and the upper and lower conveyor belts provided in the embodiments of this utility model; Figure 10 Front view of the paper flipping mechanism provided in this embodiment of the utility model Figure 2 (This demonstrates another arrangement of the guide rollers in the flipping and pressing assembly.) Explanation of reference numerals in the attached figures: 10. Frame; 20. Turning conveyor assembly; 201. Turning conveyor belt; 202. Turning limit roller; 203. Turning slave conveyor roller; 204. Turning main conveyor roller; 205. Turning tension roller; 30. Turning pressing assembly; 301. Pressing belt; 302. Lower shaft roller; 303. Lower tension roller; 304. Guide pressure roller; 305. Upper tension roller; 306. Upper shaft roller; 307. Upper pressure roller; 40. Paper feeder; 50. Turning drive assembly; 501. Turning drive wheel; 502. First conveyor belt 503. Second conveyor belt; 504. Tensioning guide wheel; 505. Turning drive motor; 60. Feed roller assembly; 601. Feeding synchronous wheel; 602. Feeding synchronous belt; 603. Feeding roller; 604. Feeding drive motor; 70. Pressing plate; 80. Paper feed roller mounting structure; 801. Paper feed roller; 802. Adjusting screw; 803. Support shaft; 804. Swing arm; 805. Housing; 806. Pin shaft; 807. Pressing screw; 90. Lower conveyor belt; 100. Upper conveyor belt. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0020] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0021] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0022] In the claims, description and the above-mentioned drawings of this utility model, the term "front-back direction" is consistent with the conveying direction of the paper to the printer, and the up-down direction is the up-down direction of the whole machine. It is based on the orientation and positional relationship shown in the drawings or the actual installation and use positional relationship, and is only for the convenience of describing the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the specific protection scope of the present invention.

[0023] Please refer to sections 1 to 2. Figure 10 The paper turning mechanism provided by this utility model will now be described. The paper turning mechanism includes a frame 10, a turning conveyor group 20, a turning pressing group 30, and a paper conveyor 40.

[0024] The flipping conveyor assembly 20 includes a flipping conveyor belt 201 and a flipping slave conveyor roller 203 and a flipping master conveyor roller 204 supported on the frame 10. The flipping conveyor belt 201 is wound around the flipping master conveyor roller 204 and the flipping slave conveyor roller 203, which are arranged vertically and vertically in a staggered manner, forming an inclined conveying system. The flipping slave conveyor roller 203 serves as the flipping inflection point of the paper. After the paper is conveyed around the flipping slave conveyor roller 203, the conveying direction can be reversed, so that the paper can be conveyed from below to above along the inclined flipping conveyor belt 201. Here, the flipping master conveyor roller 204 and the flipping slave conveyor roller 203 can also be understood as being arranged in a staggered manner, so that the flipping conveyor belt 201 can be conveyed at an inclined direction. In this embodiment, the flipping master conveyor roller 204 is located in front of and above the flipping slave conveyor roller 203. Optionally, the flipping master conveyor roller 204 is located behind and below the flipping slave conveyor roller 203.

[0025] The flipping and pressing assembly 30, a key component for preventing paper wrinkles and jams, includes a pressing belt 301 and a support roller assembly supported on the frame 10. The pressing belt 301 wraps around the flipping conveyor roller 203 via the support roller assembly and presses against the flipping conveyor belt 201. The pressing belt 301 pressing against the flipping conveyor belt 201 means that the pressing belt 301 and the flipping conveyor belt 201 are in contact, preventing the paper from curling or wrinkling between them. Because these belt-driven components, the pressing belt 301 and the flipping conveyor belt 201, are elastic, the paper held between them can be transported upwards flat.

[0026] The paper feeder 40 is positioned below and in front of the flipping conveyor roller 203 and connects to the pressure belt 301 to transfer paper between the pressure belt 301 and the flipping conveyor belt 201. For a duplex printer, this includes an upper conveyor belt 100 and a lower conveyor belt 90. The paper flipping mechanism is located at the rear end of the upper conveyor belt 100 and the lower conveyor belt 90. After single-sided printing, the paper is conveyed to the paper feeder 40 via the lower conveyor belt 90 and then enters the paper flipping mechanism to be flipped. The flipped paper is then conveyed again via the upper conveyor belt 100 to the printing mechanism for printing on the other side.

[0027] The paper feeder 40 is connected between the lower conveyor belt 90 and the pressure belt 301 to ensure that the paper is smoothly transferred to the pressure belt 301.

[0028] Compared with the prior art, the paper turning mechanism provided by this utility model has the following advantages: it is equipped with a pressing belt 301 that can both wrap around the turning conveyor roller 203 and press the turning conveyor belt 201. The lower part of the pressing belt 301 is tangent to the turning conveyor belt 201 and forms an involute inlet with the turning conveyor belt 201. The paper is conveyed from the paperboard 40 to the pressing belt 301, enters between the turning conveyor belt 201 and the pressing belt 301 through the involute inlet, and completes the reversal at the turning conveyor roller 203. With the driving of the turning conveyor belt 201 and the pressing of the pressing belt 301, it can be conveyed flat backward, avoiding paper jams. Moreover, due to the pressing of the pressing belt 301, the conveyed paper has a flattening function, thus preventing paper wrinkles.

[0029] The frame 10 provides support for all components. The basic structure of the frame 10 includes two parallel baffles. The two ends of the main turning conveyor roller 204 and the secondary turning conveyor roller 203 are mounted on the two baffles via bearings. The support roller assembly is also mounted on the two baffles via bearings.

[0030] In some embodiments, see Figures 1 to 9 As shown, the flipping conveyor group 20 also includes a flipping tension roller 205, which is close to the flipping main conveyor roller 204. The flipping tension roller 205, the flipping main conveyor roller 204, and the flipping slave conveyor roller 203 are arranged in a triangle. The first inclination formed by the flipping tension roller 205 and the flipping main conveyor roller 204 around the flipping tension roller 205 is greater than the second inclination formed by the flipping slave conveyor roller 203 and the flipping tension roller 205, so as to guide the paper to tend to be horizontal after flipping.

[0031] In the above technical solution, the tension of the flipping conveyor belt 201 is adjusted by the tension of the flipping tension roller 205 to prevent the flipping conveyor belt 201 from slipping and affecting the transmission power of the paper; in particular, the flipping tension roller 205 makes the flipping conveyor belt 201 form different tilt angles, guiding the paper's transmission angle to decrease when it reaches the upper conveyor belt, so as to facilitate horizontal transmission to the upper conveyor belt.

[0032] Meanwhile, the flipping tension roller 205 makes the flipping conveyor belt 201 triangular, forming conveyor surfaces with different inclinations, which also improves the paper transport path.

[0033] In this application, the flipping conveyor group 20 also includes a flipping limiting roller 202, which is arranged on the line connecting the main flipping conveyor roller 204 and the secondary flipping conveyor roller 203, and is located below the flipping limiting roller 202. The flipping limiting roller 202 has a limiting function on the flipping conveyor belt 201, which can prevent the middle parts of the flipping conveyor belt 201 from getting close to each other.

[0034] In some embodiments, see Figures 1 to 9 The support roller assembly includes an upper roller 306, a lower roller 302, and a lower tension roller 303; the lower roller 302 is located in front of and below the turning conveyor roller 203, and the lower tension roller 303 is located behind and below the turning conveyor roller 203, so that the pressure belt 301 wraps around the turning conveyor roller 203; the upper roller 306 is close to the turning main conveyor roller 204, so that the pressure belt 301 presses the turning conveyor belt 201. The upper roller 306, lower roller 302, and lower tension roller 303 are rotatably connected to the baffle of the frame 10 via bearings at both ends. The lower roller 302 is located below and in front of the flipping conveyor roller 203, allowing the pressing belt 301, which passes around the lower roller 302, to approach and connect with the paperboard 40 in the direction of the forward paperboard 40, so that the paper can be smoothly transferred from the paperboard 40 to the pressing belt 301. The lower roller 302, in conjunction with the upper roller 306, can make the pressing belt 301 press tightly against the flipping conveyor belt 201. Because the pressing belt 301 wraps... The paper turns around the flip-over conveyor roller 203, so the paper will change direction and bend here. In order to avoid the pressure bands 301 interfering with each other at the turning point, a lower tensioning roller 303 is set behind and below the flip-over conveyor roller 203, that is, behind the lower shaft roller 302, to support the pressure bands 301. This makes the part of the pressure bands 301 that passes around the lower tensioning roller 303 away from the flip-over conveyor roller 203. Therefore, while performing the basic tensioning function, the lower tensioning roller 303 adjusts the spacing between the pressure bands 301 and improves the tensioning effect of the pressure bands 301.

[0035] In some embodiments, see Figures 1 to 3The support roller assembly also includes an upward tensioning roller 305, which is close to the upper shaft roller 306. The upward tensioning roller 305 is vertical when the pressure belt 301 passes over the lower tensioning roller 303 and the upward tensioning roller 305, and inclined when passing over the upward tensioning roller 305 and the upper shaft roller 306. The center line connecting the upper shaft roller 306, the lower shaft roller 302, the lower tensioning roller 303, and the upward tensioning roller 305 forms a quadrilateral shape, ensuring stable and reliable transmission and pressure of the pressure belt 301.

[0036] Optionally, the flipping and pressing assembly 30 includes multiple pressing bands 301. The upper roller 306 is provided with an annular limiting groove for limiting the pressing bands 301. The lower roller 302, the lower tension roller 303, and the upper tension roller 305 are respectively provided with pressing guide wheels corresponding to each pressing band 301. Each pressing guide wheel is provided with an annular limiting groove to limit the multiple pressing bands 301 and prevent the pressing bands 301 from deviating and losing their ability to press the paper to prevent paper jams and wrinkles.

[0037] In some embodiments, see Figure 1 , Figures 5 to 9 The paper turning mechanism also includes a turning drive assembly 50, which includes a turning drive motor 505 mounted on the frame 10, a turning drive wheel 501 connected to the turning drive motor 505, and a turning driven wheel mounted on the turning main conveyor roller 204. The turning conveyor belt 201 is driven to rotate by a first conveyor belt 502 wound around the turning driven wheel and the turning drive wheel 501. The main conveyor roller 204 for turning over is also equipped with a tensioning drive wheel, and the tensioning roller 305 is driven to rotate by the second transmission belt 503 wound around the tensioning drive wheel.

[0038] As can be seen from the above technical solution, the flipping conveyor group 20 and the flipping pressing group 30 of this application share a flipping drive motor 505 for driving, and the two transmit power through belts respectively. This design simplifies the structure and reduces the number of parts used.

[0039] Optionally, the flipping conveyor group 20 and the flipping pressing group 30 can each be driven by a set of drive components. For example, a drive motor can be used to directly drive the main flipping conveyor roller 204 and the upper shaft roller 306. Alternatively, they can each be driven by a drive component to transmit power. These are common technical means, and will not be described in detail here.

[0040] In some embodiments, see Figure 1 , Figures 5 to 9The frame 10 is equipped with tensioning guide wheels 504 for tensioning the second transmission belt 503. In this application, multiple tensioning guide wheels 504 are provided. The tensioning guide wheels 504 in different positions are not named individually. By using multiple tensioning guide wheels 504 distributed in different positions, the force transmission effect of the second transmission belt 503 is improved, thereby improving the transmission power of the pressure belt 301.

[0041] In some embodiments, see Figures 1 to 3 , Figures 5 to 9 The flipping and pressing assembly 30 also includes a guide roller 304 disposed on the rear side of the flipping conveyor belt 201. The guide roller 304 keeps the pressing belt 301 pressed against the flipping conveyor belt 201. The guide roller 304 plays an auxiliary pressing and guiding role for the pressing belt 301, preventing the pressing belt 301 from jumping and detaching from the flipping conveyor belt 201 during long-distance transmission. The guide roller 304 ensures that the pressing belt 301 maintains consistent contact with the flipping conveyor belt 201, avoiding paper jams.

[0042] The guide roller 304 has the same structure as the lower roller 302. A pressure guide wheel is mounted on the guide roller 304 to restrict the pressure belt 301, ensuring its tightness and preventing it from jumping during transmission. Gaps between the pressure belt 301 and the flipping conveyor belt 201 can cause paper jams and wrinkles. This application provides guide rollers 304 distributed at both the upper and lower parts of the flipping conveyor belt 201.

[0043] The two ends of the guide roller 304 are also rotatably mounted on the two baffles of the frame 10 via bearings.

[0044] As one parallel embodiment of the flipping and pressing assembly 30, it includes two guide rollers 304, arranged one above the other. The two guide rollers 304 are located on the inner and outer sides of the pressing belt 301, respectively. (See [reference]). Figure 10 As shown.

[0045] See Figures 1 to 3 The flipping and pressing assembly 30 also includes an upper pressure roller 307 disposed between the upper shaft roller 306 and the lifting tension roller 305. The upper pressure roller 307 limits the inclined pressing belt 301 from above.

[0046] In some embodiments, see Figures 5 to 6The paper turning mechanism also includes a paper feed roller group 60 located in front of the paper feed roller 203. The paper feed roller group 60 includes a paper feed roller 603 located below the paper feed board 40 and a paper feed roller 801 located above the paper feed board 40. A transmission gap is formed between the paper feed roller 801 and the paper feed roller 603 before the paper is turned. The paper feed board 40 is provided with a clearance window to avoid the paper feed roller 801 and the paper feed roller 603.

[0047] In the above technical solution, the paper feed roller 801 and the paper conveying roller 603 are positioned above and below the paper conveying board 40, which is connected to the pressing belt 301. Therefore, the paper feed roller 801 and the paper conveying roller 603 are close to the flipping conveyor roller 203. After the paper leaves the lower conveyor belt 90, it passes through the transmission gap between the paper feed roller 801 and the paper conveying roller 603 and is then transferred to the pressing belt 301. The paper is then carried into the flipping conveyor belt 201 and the pressing belt 301 through the involute-shaped inlet. This allows the paper to enter the flipping conveyor belt 201 and the pressing belt 301 flat, avoiding paper jams or wrinkles. This also solves the problem that the existing paper transmission distance to the flipping inflection point is too long and is prone to jamming.

[0048] The paper feed roller assembly 60 includes a paper feed drive assembly, which includes a paper feed drive motor 604, a paper feed timing wheel 601 mounted on the main shaft of the paper feed drive motor 604, a paper feed driven wheel mounted on the paper feed roller 603, and a wound paper feed timing belt 602. The paper feed drive motor 604 drives the paper feed roller 603 to rotate through the paper feed timing belt 602, and the friction drives the upper paper feed roller 801 to rub the paper and transfer it backward to the pressure belt 301.

[0049] This application includes multiple paper feed rollers 801. The simplest way to install the paper feed rollers 801 is to install multiple paper feed rollers 801 on a single paper feed shaft. The two ends of the paper feed shaft are installed on the baffles of the frame 10. The multiple paper feed rollers 801 feed paper simultaneously at different points, so that the paper is conveyed backward.

[0050] See Figures 5 to 6The paper feed roller 801 in this application is installed as follows: the paper feed roller mounting structure 80 includes a support shaft 803, a housing 805 spaced on the support shaft 803, a swing arm 804 extending into the housing 805, and an adjusting assembly for adjusting the height of the paper feed roller 801. The paper feed roller 801 is mounted on the swing arm 804, and the swing arm 804 is rotatably connected to the housing 805 via a pin 806. The adjusting assembly includes an adjusting screw 802 screwed into and extending into the housing 805, with the lower end of the adjusting screw 802 abutting against the swing arm. On 804, the adjusting screw 802 can be rotated downward to press the swing arm 804 downward, thereby adjusting the transmission gap between the paper feed roller 801 and the paper feed roller 603 to accommodate paper of different thicknesses. The paper feed roller mounting structure 80 also includes a clamping screw 807 screwed onto the housing 805 and a spring clamped by the clamping screw 807. The spring is inside the housing 805 and abuts against the swing arm 804 through the clamping screw 807. The elasticity of the spring can provide buffer adjustment for the paper feed roller 801 to feed paper of different thicknesses. The adjusting screw 802 and the clamping screw 807 are respectively located on both sides of the pin 806, and the adjusting screw 802 is located at the end away from the paper feed roller 801.

[0051] In some embodiments, see Figures 5 to 6 A pressure plate 70 is provided above the paperboard 40, and the pressure plate 70 is connected to the frame 10 by a bracket.

[0052] The pressure plate 70 is connected to the baffle of the frame 10 by a bracket. The front end of the pressure plate 70 is tilted upward, which guides the paper and makes it easier to straighten individual tilted paper into the transmission between the pressure plate 70 and the feed plate 40, thereby avoiding paper jams.

[0053] The rear end of the pressure plate 70 extends to partially overlap with the pressure band 301, which can also prevent the paper from jamming or wrinkling when flipping.

[0054] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0055] Based on the same inventive concept, this application also provides a printer, including the aforementioned paper flipping mechanism.

[0056] The printer provided in this embodiment of the utility model adopts a flipping mechanism that can avoid paper jams and wrinkles when flipping the paper, thereby reducing the frequency of equipment downtime and ensuring print clarity, thus improving the printer's performance.

[0057] The printing process of the duplex printer is as follows: Unprinted paper is conveyed to the printing mechanism via the upper conveyor belt 100. After single-sided printing, it continues to be conveyed forward via the upper conveyor belt 100 until it reaches the front end of the upper conveyor belt 100. It is then conveyed downward through the front conveyor channel to the lower conveyor belt 90. The lower conveyor belt 90 drives the paper to be conveyed backward. The paper enters between the paper feed roller 801 and the paper feed roller 603. After being rubbed by the paper feed roller 801, it is conveyed backward to the pressure belt 301. Driven by the pressure belt 301, the paper is wrapped around and flipped from the conveyor roller 203. It then changes direction again and is conveyed upward at an angle along the flipping conveyor belt 201 until it enters the upper conveyor belt 100 to achieve flipping. The flipped paper is then conveyed again via the upper conveyor belt 100 to the printing mechanism for printing on the other side, thus completing the duplex printing.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A paper flipping mechanism, characterized in that, include: Rack (10); The flipping conveyor assembly (20) includes a flipping conveyor belt (201) and a flipping slave conveyor roller (203) and a flipping master conveyor roller (204) supported on the frame (10); the flipping conveyor belt (201) is wound around the flipping master conveyor roller (204) and the flipping slave conveyor roller (203) which are arranged in an up-down staggered manner, forming an inclined conveying; A flipping and pressing assembly (30) includes a pressing belt (301) and a support roller assembly supported on the frame (10); the pressing belt (301) wraps around the flipping conveyor roller (203) via the support roller assembly and presses the flipping conveyor belt (201); and Paper feeder (40) is positioned below and in front of the flipping conveyor roller (203) and is connected to the pressing belt (301) to transfer paper between the pressing belt (301) and the flipping conveyor belt (201).

2. The paper turning mechanism as claimed in claim 1, wherein The flipping conveyor group (20) also includes a flipping tension roller (205), which is close to the main flipping conveyor roller (204). The flipping tension roller (205), the main flipping conveyor roller (204), and the flipping slave conveyor roller (203) are arranged in a triangle. The first inclination formed by the flipping tension roller (205) and the flipping main conveyor roller (204) is greater than the second inclination formed by the flipping feeder roller (203) and the flipping tension roller (205) to guide the paper's transmission angle after flipping towards a horizontal direction.

3. The paper turning mechanism as claimed in claim 1, wherein The support roller assembly includes an upper roller (306), a lower roller (302), and a lower tension roller (303); the lower roller (302) is located in front of and below the turning conveyor roller (203), and the lower tension roller (303) is located behind and below the turning conveyor roller (203) so that the pressure belt (301) wraps around the turning conveyor roller (203); the upper roller (306) is close to the turning main conveyor roller (204) so ​​that the pressure belt (301) presses the turning conveyor belt (201).

4. The paper turning mechanism as claimed in claim 3, wherein The support roller assembly also includes an upward tension roller (305), which is close to the upper shaft roller (306) and causes the pressing belt (301) to be in a vertical state when passing over the lower tension roller (303) and the upward tension roller (305), and in an inclined state when passing over the upward tension roller (305) and the upper shaft roller (306).

5. The paper turning mechanism as claimed in claim 4, wherein It also includes a flipping drive assembly (50), which includes a flipping drive motor (505) mounted on the frame (10), a flipping drive wheel (501) connected to the flipping drive motor (505), and a flipping driven wheel mounted on the flipping main conveyor roller (204). The flipping conveyor belt (201) is driven to rotate by a first transmission belt (502) wound around the flipping driven wheel and the flipping drive wheel (501). The main conveyor roller (204) for turning over is also provided with a tensioning drive roller, and the tensioning roller (305) is driven to rotate by a second transmission belt (503) wrapped around the tensioning drive roller.

6. The paper turning mechanism as described in claim 5, characterized in that, The frame (10) is provided with a tensioning guide wheel (504) for tensioning the second transmission belt (503).

7. The paper reversing mechanism of claim 1 wherein, The flipping and pressing assembly (30) further includes a guide roller (304) disposed on the rear side of the flipping conveyor belt (201), the guide roller (304) keeping the pressing belt (301) pressed against the flipping conveyor belt (201).

8. The paper reversing mechanism of claim 1 wherein, It also includes a paper feed roller assembly (60) disposed in front of the flipping conveyor roller (203), the paper feed roller assembly (60) including a paper feed roller (603) located below the paper feed board (40) and a paper feed roller (801) located above the paper feed board (40), the paper feed roller (801) and the paper feed roller (603) forming a transmission gap before the paper flipping; the paper feed board (40) is provided with a clearance window to avoid the paper feed roller (801) and the paper feed roller (603).

9. The paper reversing mechanism of claim 1 wherein, A pressure plate (70) is provided above the feed plate (40), and the pressure plate (70) is connected to the frame (10) by a bracket.

10. A printer characterized by comprising: Includes a paper flipping mechanism as described in any one of claims 1-9.

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