Printer

Abstract

The utility model relates to the technical field of printing equipment, and particularly discloses a printer which comprises a paper roll supporting mechanism, a flattening mechanism and a printing mechanism which are sequentially arranged in the moving direction of paper, and the flattening mechanism comprises an installation frame and a correction roller assembly located between the paper roll supporting mechanism and the printing mechanism. The correcting roller assembly comprises a first supporting roller and a second supporting roller which are used for supporting the first face of the paper and a pressing piece used for supporting the second face of the paper, and the pressing piece is movably connected with the mounting frame and has a working state and an idle state which are located on the two sides of the center connecting line of the first supporting roller and the second supporting roller correspondingly. When the pressing piece is in the working state, paper is curled in the direction opposite to the curling direction of the paper roll and larger than the maximum curling curvature of the paper roll, and when the pressing piece is in the idle state, the pressing piece has no supporting force on the paper or enables the paper to be curled in the direction opposite to the curling direction of the paper roll and smaller than the minimum curling curvature of the paper roll. And the moving smoothness of the paper and the stacking regularity after printing are improved.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment technology, and in particular to a printer. Background Technology

[0002] Printers typically use roll paper as the printing medium. Roll paper is formed by winding thin sheets of paper or other media onto a mandrel to form a paper roll. Therefore, the paper drawn from the roll will have a certain degree of curvature after being unrolled. In particular, as the paper is consumed, the outer diameter of the roll gradually decreases, and the curvature of the paper gradually increases accordingly. Therefore, paper jams are prone to occur during the printing process, or after printing is completed, when the paper is cut and ejected, there is a problem that the curled paper cannot be neatly stacked at the paper exit.

[0003] To address this problem, Chinese patent CN205800542U discloses a technical solution that includes a curling correction mechanism between a paper roll support mechanism and a printing mechanism. This mechanism comprises a first roller, a second roller, and a third roller arranged in a triangular configuration. These rollers support the paper and induce a curling deformation opposite to the paper roll's curling direction. Specifically, the second roller is located between the first and third rollers. When the printing mechanism is printing, the paper at the second roller of the curling correction mechanism is subjected to a first force pointing downstream and a second force pointing upstream. These forces are angled together at the second roller, causing the paper to curl at the second roller in the opposite direction to the paper roll's curling direction, thus correcting the paper curl. However, when the printer is in standby mode, the second roller will press the paper for an extended period, potentially leading to over-correction. This means that even after the paper leaves the second roller, it may still exhibit a curl opposite to the paper roll's curling direction, causing paper jams during printing or preventing neat stacking of the paper after printing. Utility Model Content

[0004] The purpose of this invention is to provide a printer that improves the smoothness of paper movement and the neatness of paper stacking after printing.

[0005] This utility model provides a printer, which includes:

[0006] The device includes a paper roll support mechanism, a printing mechanism, and a flattening mechanism. The paper roll support mechanism supports a paper roll, the printing mechanism prints on paper drawn from the paper roll, and the flattening mechanism includes a mounting frame and a correction roller assembly disposed on the mounting frame. Along the paper movement direction, the correction roller assembly is located between the paper roll support mechanism and the printing mechanism.

[0007] The correction roller assembly includes a first support roller, a second support roller, and a pressing member. Along the moving direction of the paper, the first support roller, the pressing member, and the second support roller are arranged in sequence at intervals. The first support roller and the second support roller are used to support the first side of the paper. The pressing member is movably connected to the mounting frame. The pressing member includes a pressing shaft for supporting the second side of the paper. The pressing member can move relative to the mounting frame and has a working state and an idle state.

[0008] When the pressing member is in the working state, the pressing shaft is located on the first side of the center line connecting the first support roller and the second support roller, causing the paper supported by the first support roller, the pressing shaft, and the second support roller to curl in the opposite direction to the paper roll curling direction, and the curling curvature of the paper is greater than the maximum curling curvature of the paper roll. When the pressing member is in the idle state, the pressing shaft is located on the second side of the center line connecting the first support roller and the second support roller, causing the pressing shaft to not generate a supporting force on the paper or causing the paper supported by the first support roller, the second support roller, and the pressing shaft to curl in the opposite direction to the paper roll curling direction, and the curling curvature of the paper is less than the minimum curling curvature of the paper roll.

[0009] As a preferred technical solution for the printer, the flattening mechanism further includes a driving component, which is used to drive the pressing element to switch to the working state or the idle state.

[0010] As a preferred technical solution for the printer, the pressing member is configured to always have a tendency to switch to the working state. The driving component includes a motor and a pushing member. The motor is mounted on the mounting frame, and the pushing member is movably connected to the mounting frame. The pushing member can move relative to the mounting frame and has a first position and a second position. The motor is used to drive the pushing member to move relative to the mounting frame to the first position or the second position.

[0011] When the pusher moves to the first position, the pusher abuts against the pressing member and drives the pressing member to move so that the pressing member switches to the idle state. When the pusher moves to the second position, the pusher separates from the pressing member, and the pressing member switches to the working state under the action of elastic force and / or gravity.

[0012] As a preferred technical solution for the printer, both the pressing member and the pushing member are slidably connected to the mounting bracket, and the sliding direction of the pushing member from the second position to the first position is the same as the sliding direction of the pressing member from the working state to the idle state.

[0013] As a preferred technical solution for the printer, the pusher is configured to always have a tendency to move toward the second position;

[0014] The drive assembly further includes a transmission assembly configured to connect or disconnect the motor and the pusher. When the motor is connected to the pusher, the motor drives the pusher to the first position via the transmission assembly. When the motor is disconnected from the pusher, the pusher moves to the second position under the action of elastic force and / or gravity.

[0015] As a preferred technical solution for the printer, the pushing member includes a straight toothed portion, and the transmission assembly includes a first transmission wheel and a second transmission wheel that are coaxial and fixedly connected. The first transmission wheel and the second transmission wheel are both disposed on the mounting frame and can rotate around their own axis. The first transmission wheel is connected to the motor for transmission, and the outer peripheral surface of the second transmission wheel is provided with a fan-shaped toothed portion.

[0016] When the second transmission wheel rotates within a first preset angle range, the sector-shaped toothed portion is connected to the straight toothed portion, and the sector-shaped toothed portion can drive the pusher to slide to the first position; when the second transmission wheel rotates within a second preset angle range, the sector-shaped toothed portion is disconnected from the straight toothed portion, and the pusher slides to the second position under the action of elastic force and / or gravity.

[0017] As a preferred technical solution for the printer, the drive assembly includes two pushers, and the drive assembly also includes a transmission shaft, a first gear and a second gear, with the two pushers spaced apart along the width direction of the paper;

[0018] The drive shaft is supported by the mounting bracket and can rotate relative to the mounting bracket around its own axis. The first gear and the second gear are respectively fixedly sleeved at both ends of the drive shaft, and the first gear and the second gear respectively mesh with the linear toothed portions of the two pushers. When the second drive wheel rotates within the first preset angle range, the fan-shaped toothed portion meshes with the first gear. When the second drive wheel rotates within the second preset angle range, the fan-shaped toothed portion separates from the first gear.

[0019] As a preferred technical solution for the printer, the pressing component further includes two guide shafts, which are spaced apart along the width direction of the paper. Both guide shafts are movably connected to the mounting frame and can slide relative to the mounting frame along the axial direction of the guide shafts. The two ends of the pressing shaft are respectively fixedly connected to one end of the two guide shafts. The pressing shaft, the first support roller, and the second support roller are arranged in parallel.

[0020] As a preferred technical solution for the printer, the flattening mechanism further includes two first compression springs, which are respectively sleeved on the two guide shafts. The two first compression springs are used to ensure that the pressing element always has a tendency to switch to the working state.

[0021] As a preferred technical solution for the printer, the flattening mechanism includes an operating part fixedly connected to the pressing member. The operating part is used by the operator to hold and drive the pressing member to switch to the working state or the idle state.

[0022] The printer provided by this utility model has at least the following beneficial effects:

[0023] The printer includes a paper roll support mechanism, a printing mechanism, and a flattening mechanism. The paper roll support mechanism supports the paper roll, the printing mechanism prints on the paper drawn from the paper roll, and the flattening mechanism includes a mounting frame and a correction roller assembly disposed on the mounting frame. Along the paper's movement direction, the correction roller assembly is located between the paper roll support mechanism and the printing mechanism. The correction roller assembly includes a first support roller, a second support roller, and a pressing member. Along the paper's movement direction, the first support roller, the pressing member, and the second support roller are arranged sequentially at intervals. The first and second support rollers support the first side of the paper. The pressing member is movably connected to the mounting frame and includes a pressing shaft for supporting the second side of the paper. The pressing member is operable relative to the mounting frame. The pressing component has a working state and an idle state. When the pressing component is in the working state, the pressing shaft is located on the first side of the center line connecting the first support roller and the second support roller, and the paper supported by the first support roller, the pressing shaft and the second support roller curls in the opposite direction to the paper roll curling direction, and the curling curvature of the paper is greater than the maximum curling curvature of the paper roll. When the pressing component is in the idle state, the pressing shaft is located on the second side of the center line connecting the first support roller and the second support roller, and the pressing shaft does not generate a supporting force on the paper or the paper supported by the first support roller, the second support roller and the pressing shaft curls in the opposite direction to the paper roll curling direction, and the curling curvature of the paper is less than the minimum curling curvature of the paper roll. When the printer is in operation, the pressing mechanism is engaged, and the paper curls in the opposite direction to the paper roll's curling direction under the combined support of the first support roller, the pressing shaft, and the second support roller. The curvature of this curl is greater than the maximum curvature of the paper roll, thus flattening the paper. When the printer is in standby mode, the pressing mechanism is switched to an idle state. The pressing shaft does not exert any support force on the paper, or the paper curls in the opposite direction to the paper roll's curling direction under the combined support of the first support roller, the pressing shaft, and the second support roller. The curvature of this curl is less than the minimum curvature of the paper roll. This avoids the pressing mechanism remaining in the working state for a long time and pressing the same position on the paper, which could cause the paper to curl and deform in the opposite direction. This improves the smoothness of paper movement and the neatness of the paper stacking after printing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the printer structure in an embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional view of the printer in an embodiment of this utility model;

[0026] Figure 3 This is a partial structural diagram of the printer in an embodiment of the present utility model;

[0027] Figure 4 This is an enlarged view of the first partial structure of the printer in an embodiment of this utility model;

[0028] Figure 5 This is an exploded view of a portion of the printer structure in an embodiment of this utility model;

[0029] Figure 6 for Figure 2 Enlarged view at point A in the middle;

[0030] Figure 7 This is an enlarged view of the second partial structure of the printer in an embodiment of this utility model.

[0031] In the picture:

[0032] 1. Paper roll support mechanism;

[0033] 2. Printing mechanism;

[0034] 3. Flattening mechanism; 31. Mounting frame; 311. Guide protrusion; 32. Correction roller assembly; 321. First support roller; 322. Second support roller; 323. Pressing element; 324. Pressing shaft; 325. Guide shaft; 33. First elastic element; 34. Detection element; 35. Detection section; 36. Cover; 37. Receiving cavity;

[0035] 4. Drive assembly; 41. Motor; 42. Pushing element; 421. Guide groove; 422. Straight toothed portion; 423. Pushing surface; 43. Transmission assembly; 431. First transmission wheel; 432. Second transmission wheel; 433. Worm gear; 434. Sector toothed portion; 44. Second elastic element; 45. Transmission shaft; 46. First gear; 47. Second gear;

[0036] 5. Paper roll; 51. Paper. Detailed Implementation

[0037] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0041] Please refer to Figures 1 to 4This embodiment provides a printer, which includes a paper roll support mechanism 1, a printing mechanism 2, and a flattening mechanism 3. The paper roll support mechanism 1 supports a paper roll 5, the printing mechanism 2 prints on paper 51 drawn from the paper roll 5, and the flattening mechanism 3 includes a mounting frame 31 and a correction roller assembly 32 disposed on the mounting frame 31. Along the moving direction of the paper 51, the correction roller assembly 32 is located between the paper roll support mechanism 1 and the printing mechanism 2. The correction roller assembly 32 includes a first support roller 321, a second support roller 322, and a pressing member 323. Along the moving direction of the paper 51, the first support roller 321, the pressing member 323, and the second support roller 322 are arranged sequentially at intervals. The first support roller 321 and the second support roller 322 support the first side of the paper 51. The pressing member 323 is movably connected to the mounting frame 31 and includes a pressing shaft 324 for supporting the second side of the paper 51. The pressing member 323 can move relative to the mounting frame 31, and the pressing member 323... 23 has a working state and an idle state; when the pressing member 323 is in the working state, the pressing shaft 324 is located on the first side of the center line connecting the first support roller 321 and the second support roller 322, and the paper 51 supported by the first support roller 321, the pressing shaft 324 and the second support roller 322 curls in the opposite direction to the curling direction of the paper roll 5, and the curling curvature of the paper 51 is greater than the maximum curling curvature of the paper roll 5. When the pressing member 323 is in the idle state, the pressing shaft 324 is located on the second side of the center line connecting the first support roller 321 and the second support roller 322, and the pressing shaft 324 does not generate a supporting force on the paper 51 or the paper 51 supported by the first support roller 321, the second support roller 322 and the pressing shaft 324 curls in the opposite direction to the curling direction of the paper roll 5, and the curling curvature of the paper 51 is less than the minimum curling curvature of the paper roll 5.

[0042] In this embodiment, when the printer is in operation, the pressing member 323 is in the working state. At this time, the pressing shaft 324 is located on the first side of the line connecting the centers of the first support roller 321 and the second support roller 322. Under the joint support of the first support roller 321, the pressing shaft 324, and the second support roller 322, the paper 51 curls in the opposite direction to the curling direction of the paper roll 5, that is, the paper 51 curls in the opposite direction, and the curvature of the reverse curl of the paper 51 is greater than the maximum curl curvature of the paper roll 5, so as to flatten the paper 51. When the printer is in standby mode, the pressing member 323 is switched to the idle state. At this time, the pressing shaft 324 is located on the first side of the line connecting the centers of the first support roller 321 and the second support roller 322. 21 is on the second side of the center line connecting the second support roller 322, and the pressing shaft 324 does not generate a supporting force on the paper 51, so that the paper 51 will not curl in the opposite direction to the curling direction of the paper roll 5, or the paper 51 will curl in the opposite direction to the curling direction of the paper roll 5 under the joint support of the first support roller 321, the pressing shaft 324 and the second support roller 322, and the curvature of the reverse curl of the paper 51 is less than the minimum curl curvature of the paper roll 5, so as to avoid the pressing part 323 staying in the working state for a long time and pressing the same position of the paper 51, causing the paper 51 to curl in the opposite direction and deform, thus improving the smoothness of the movement of the paper 51 and the neatness of the paper 51 after printing.

[0043] In this embodiment, the minimum curl curvature of the paper roll 5 refers to the curl curvature corresponding to the outermost layer of paper 51 in the unused paper roll 5, and the maximum curl curvature of the paper roll 5 refers to the curl curvature corresponding to the innermost layer of paper 51 in the paper roll 5. Therefore, for any type of paper roll 5, both the maximum and minimum curl curvature of the paper roll 5 are fixed.

[0044] It should be noted that when the pressing member 323 switches from the working state to the idle state, the paper 51 located between the first support roller 321 and the second support roller 322 is tightened so that the paper 51 can maintain contact with the pressing shaft 324; when the pressing member 323 switches from the idle state to the working state, the paper 51 located between the first support roller 321 and the second support roller 322 is released so that the pressing member 323 can switch back to the working state. The tightening and releasing of the paper 51 is prior art and will not be described further in this embodiment.

[0045] Alternatively, please refer to Figure 6 and Figure 7 When the pressing element 323 is in the working state, the angle between the center line connecting the first support roller 321 and the pressing shaft 324 and the center line connecting the second support roller 322 and the pressing shaft 324 is an acute angle; when the pressing element 323 is in the idle state, the angle between the center line connecting the first support roller 321 and the pressing shaft 324 and the center line connecting the second support roller 322 and the pressing shaft 324 is an obtuse angle.

[0046] Alternatively, please refer to Figures 2 to 7 The flattening mechanism 3 also includes a drive assembly 4, which is used to drive the pressing member 323 to switch between working and idle states. This configuration, where the pressing member 323 is moved via the drive assembly 4, improves the reliability of switching the pressing member 323 between working and idle states.

[0047] Optionally, please refer to again Figures 2 to 7 The pressing member 323 is configured to always have a tendency to switch to the working state. The drive assembly 4 includes a motor 41 and a pusher 42. The motor 41 is mounted on the mounting bracket 31, and the pusher 42 is movably connected to the mounting bracket 31. The pusher 42 can move relative to the mounting bracket 31 and has a first position and a second position. The motor 41 is used to drive the pusher 42 to move relative to the mounting bracket 31 to the first position or the second position. When the pusher 42 moves to the first position, the pusher 42 abuts against the pressing member 323 and drives the pressing member 323 to move so that the pressing member 323 switches to the idle state. When the pusher 42 moves to the second position, the pusher 42 separates from the pressing member 323, and the pressing member 323 switches to the working state under the action of elastic force and / or gravity. This configuration allows the pressing element 323 to separate from the pushing element 42 during printer operation. The pressing element 323 is not restricted by the pushing element 42. Under the action of elastic force and / or gravity, the pressing element 323 always has a tendency to switch to the working state. This allows the pressing element 323 to move in the direction of the paper 51's movement path when the paper 51 is over-tensioned. When the paper 51 is over-slack, the pressing element 323 automatically presses the paper 51, preventing the paper 51 from being over-tensioned or over-slack and improving the smoothness of the paper 51's movement.

[0048] Alternatively, please refer to Figures 2 to 4 ,as well as Figure 6 In this embodiment, the flattening mechanism 3 further includes a first elastic element 33. The first elastic element 33 is used to ensure that the pressing element 323 always has a tendency to switch to the working state. When the pushing element 42 moves to the second position, the pressing element 323 switches to the working state under the action of the elastic force of the first elastic element 33. Preferably, the first elastic element 33 is a first compression spring. In other embodiments, the first elastic element 33 can also be set as a first tension spring.

[0049] In other embodiments, the pressing member 323 may also always have a tendency to switch to the working state under its own gravity. When the pushing member 42 moves to the second position, the pressing member 323 switches to the working state under its own gravity. Alternatively, the flattening mechanism 3 may also include a first elastic member 33, which is used to ensure that the pressing member 323 always has a tendency to switch to the working state, and the pressing member 323 always has a tendency to switch to the working state under its own gravity. When the pushing member 42 moves to the second position, the pressing member 323 switches to the working state under the combined action of the elastic force of the first elastic member 33 and its own gravity.

[0050] As one alternative, the drive assembly 4 includes a motor 41 and a pusher 42. The motor 41 is mounted on the mounting bracket 31, and the pusher 42 is movably connected to the mounting bracket 31 and connected to the pressing member 323. The pusher 42 can move relative to the mounting bracket 31 and has a first position and a second position. The motor 41 is used to drive the pusher 42 to move relative to the mounting bracket 31 to the first position or the second position. When the pusher 42 moves from the second position to the first position, the pusher 42 drives the pressing member 323 to switch from the working state to the idle state. When the pusher 42 moves from the first position to the second position, the pusher 42 drives the pressing member 323 to switch from the idle state to the working state.

[0051] Alternatively, please refer to Figure 2 In this embodiment, both the pressing member 323 and the pushing member 42 are slidably connected to the mounting bracket 31, and the sliding direction of the pushing member 42 from the second position to the first position is the same as the sliding direction of the pressing member 323 from the working state to the idle state. This configuration improves the reliability of the pressing member 323 switching to the working state and the idle state, as well as the reliability of the pushing member 42 moving to the first position and the second position. In other embodiments, the pushing member 42 may also be pivotally connected to the mounting bracket 31, and / or the pressing member 323 may also be pivotally connected to the mounting bracket 31.

[0052] Alternatively, please refer to Figure 3 and Figure 5 In this embodiment, one of the mounting bracket 31 and the pushing member 42 is provided with a guide protrusion 311, and the other is provided with a guide groove 421. The guide protrusion 311 is inserted into the guide groove 421 and can slide along the guide groove 421. In this embodiment, the mounting bracket 31 is provided with a guide protrusion 311 and the pushing member 42 is provided with a guide groove 421. In other embodiments, the mounting bracket 31 may be provided with a guide groove 421 and the pushing member 42 may be provided with a guide protrusion 311.

[0053] Alternatively, please refer to Figures 2 to 5The pusher 42 is configured to always have a tendency to move towards the second position. The drive assembly 4 also includes a transmission assembly 43, which is configured to connect or disconnect the motor 41 and the pusher 42. When the motor 41 is connected to the pusher 42, the motor 41 drives the pusher 42 to the first position via the transmission assembly 43. When the motor 41 is disconnected from the pusher 42, the pusher 42 moves to the second position under the action of elastic force and / or gravity. This configuration allows the motor 41 to be used only to drive the pusher 42 to the first position, and the pusher 42 to the second position under the action of elastic force or gravity. This facilitates the control of the operation of the motor 41 and improves the reliability of the pusher 42 moving to the first or second position. In other embodiments, the motor 41 is connected to the pusher 42 in a transmission manner. When the output shaft of the motor 41 rotates in a first direction, the motor 41 drives the pusher 42 to move to a first position. When the output shaft of the motor 41 rotates in a second direction, the motor 41 drives the pusher 42 to slide to a second position. The first direction and the second direction are opposite.

[0054] Alternatively, please refer to Figures 3 to 5 The drive assembly 4 further includes a second elastic element 44, which is connected between the pusher 42 and the mounting bracket 31. The second elastic element 44 is used to ensure that the pusher 42 always has a tendency to move towards the second position. When the motor 41 is disconnected from the drive connection with the pusher 42, the pusher 42 moves to the second position under the elastic force of the second elastic element 44. Preferably, the second elastic element 44 is a second tension spring. In other embodiments, the second elastic element 44 may also be a second compression spring.

[0055] In other embodiments, the pusher 42 always tends to move towards the second position under its own weight. When the motor 41 is disconnected from the drive connection of the pusher 42, the pusher 42 moves to the second position under its own weight. Alternatively, the drive assembly 4 may also include a second elastic member 44, which is connected between the pusher 42 and the mounting bracket 31. The second elastic member 44 is used to ensure that the pusher 42 always tends to move towards the second position, and the pusher 42 always tends to move towards the second position under its own weight. When the motor 41 is disconnected from the drive connection of the pusher 42, the pusher 42 moves to the second position under the combined action of its own weight and the elastic force of the second elastic member 44.

[0056] Alternatively, please refer to Figure 1 and Figure 4The flattening mechanism 3 also includes a detection element 34 and a detection unit 35. The detection element 34 is disposed on the mounting bracket 31, and the detection unit 35 is disposed on the pusher 42. When the pusher 42 moves to the first position under the drive of the motor 41, the detection element 34 and the detection unit 35 cooperate. When the pusher 42 disengages from the first position, the detection element 34 and the detection unit 35 separate. This arrangement can improve the reliability of the pusher 42 moving to the first position. Preferably, in this embodiment, the detection element 34 is a photoelectric sensor, which includes a light emitter and a light receiver spaced apart. When the pusher 42 moves to the first position, the detection part 35 is located between the light emitter and the light receiver. Due to the obstruction of the detection part 35, the light receiver cannot receive the light emitted by the light emitter, causing the detection element 34 to emit a first detection signal (e.g., a low level), indicating that the pusher 42 is at the first position. When the pusher 42 moves away from the first position, the detection part 35 moves away from between the light emitter and the light receiver, and the light receiver can receive the light emitted by the light emitter. The detection element 34 then emits a second detection signal (e.g., a high level), indicating that the pusher 42 has fallen out of the first position. In other embodiments, the detection element 34 can also be configured as a contact switch.

[0057] Alternatively, please refer to Figure 2 and Figure 3 In this embodiment, the pushing member 42 includes a straight toothed portion 422, and the transmission assembly 43 includes a first transmission wheel 431 and a second transmission wheel 432 that are coaxial and fixedly connected. Both the first transmission wheel 431 and the second transmission wheel 432 are mounted on the mounting frame 31 and can rotate around their own axis. The first transmission wheel 431 is connected to the motor 41. The outer circumferential surface of the second transmission wheel 432 is provided with a fan-shaped toothed portion 434. When the second transmission wheel 432 rotates within a first preset angle range, the fan-shaped toothed portion 434 is connected to the straight toothed portion 422, and the fan-shaped toothed portion 434 can drive the pushing member 42 to slide to the first position. When the second transmission wheel 432 rotates within a second preset angle range, the fan-shaped toothed portion 434 is disconnected from the straight toothed portion 422, and the pushing member 42 slides to the second position under the action of elastic force and / or gravity. With this configuration, the motor 41 only needs to drive the first transmission wheel 431 to rotate in a single direction to achieve alternating connection and disconnection of the transmission between the sector-shaped toothed portion 434 and the linear toothed portion 422, thereby controlling the movement of the pusher 42 to the first or second position. This simplifies control and improves the reliability of the pusher 42 moving to the first or second position. Preferably, the sum of the first preset angle range and the second preset angle range is 360°. For example, the first preset angle range is greater than 0° and less than or equal to 170°, and the second preset angle range is greater than 170° and less than or equal to 360°.

[0058] Alternatively, please refer to Figures 3 to 5In this embodiment, the transmission assembly 43 further includes a worm gear 433 fixedly sleeved on the output shaft of the motor 41, and the first transmission wheel 431 is a worm gear that meshes with the worm gear 433. In other embodiments, the transmission assembly 43 further includes an output gear sleeved on the output shaft of the motor 41, and the first transmission wheel 431 is an input gear that meshes with the output gear; or, the first transmission wheel 431 is fixedly mounted on the output shaft of the motor 41.

[0059] As an alternative, the transmission assembly 43 includes a swing frame, a first transmission gear, a second transmission gear, and a third transmission gear. The swing frame is pivotally connected to the mounting frame 31 via a rotating shaft, and the swing frame can rotate relative to the mounting frame 31 around the axis of the rotating shaft. The swing frame has a transmission position and a disconnection position. The swing frame is provided with a support shaft coaxial with the rotating shaft. The first transmission gear is sleeved with the support shaft, and a set damping force can be generated between the first transmission gear and the support shaft. The first transmission gear is connected to the motor 41. The second transmission gear is located on the swing component and can rotate around its own axis. The second rotating wheel meshes with the first transmission gear. The third transmission gear is connected to the pusher component. 42. In the transmission connection, when the swing frame is in the transmission position, the second transmission gear and the third transmission gear mesh. When the swing frame is in the disengagement position, the second transmission gear and the third transmission gear disengage. When the output shaft of the motor 41 rotates in the first direction, the first transmission gear drives the swing frame to rotate to the disengagement position through a set damping force. When the output shaft of the motor 41 rotates in the second direction, the first transmission gear drives the swing frame to rotate to the transmission position through a set damping force. When the first transmission gear drives the swing frame to rotate to the transmission position, the rotational resistance of the swing frame is greater than the set damping force, and the first transmission gear slips relative to the swing frame under the continued drive of the motor 41.

[0060] Alternatively, please refer to Figure 3In this embodiment, the drive assembly 4 includes two pushers 42, and also includes a drive shaft 45, a first gear 46, and a second gear 47. The two pushers 42 are spaced apart along the width direction of the paper 51. The drive shaft 45 is supported by the mounting bracket 31 and can rotate relative to the mounting bracket 31 around its own axis. The first gear 46 and the second gear 47 are respectively fixedly sleeved with the two ends of the drive shaft 45, and the first gear 46 and the second gear 47 respectively mesh with the straight toothed portions 422 of the two pushers 42. When the second drive wheel 432 rotates within a first preset angle range, the fan-shaped toothed portion 434 meshes with the first gear 46. When the second drive wheel 432 rotates within a second preset angle range, the fan-shaped toothed portion 434 separates from the first gear 46. This configuration ensures that when the fan-shaped toothed portion 434 meshes with the first gear 46, the motor 41 drives the two pushers 42 to slide synchronously to the first position via the first gear 46 and the second gear 47. The two pushers 42 then jointly drive the pressing member 323 to switch to the idle state, improving the reliability of the pressing member 323 switching to the idle state. The width direction of the paper 51 is the same as the axial direction of the drive shaft 45. In other embodiments, the drive assembly 4 may also include only one pusher 42, and the fan-shaped toothed portion 434 may directly or indirectly mesh with the straight toothed portion 422.

[0061] Alternatively, please refer to Figure 3 and Figure 4 The pusher 42 includes a push surface 423, which is perpendicular to the extending direction of the straight toothed portion 422. This arrangement improves the reliability of the pusher 42 in pushing the pressing member 323.

[0062] Alternatively, please refer to Figure 1 and Figure 5 The mounting bracket 31 has an open mounting cavity. The motor 41, the first transmission wheel 431, the second transmission wheel 432, and the pusher 42 are all installed in the receiving cavity 37. The flattening mechanism 3 also includes a cover 36, which is detachably connected to the mounting bracket 31 to cover at least part of the open cavity. This arrangement improves the installation stability of the drive assembly 4.

[0063] Alternatively, please refer to Figure 3 and Figure 4The pressing component 323 also includes two guide shafts 325, which are spaced apart along the width direction of the paper 51. Both guide shafts 325 are movably connected to the mounting frame 31 and can slide relative to the mounting frame 31 along the axial direction of the guide shafts 325. The two ends of the pressing shaft 324 are fixedly connected to one end of each of the two guide shafts 325. The pressing shaft 324, the first support roller 321, and the second support roller 322 are arranged in parallel. This arrangement improves the pressing reliability of the pressing component 323 on the paper 51. Optionally, when the motor 41 drives the two pushing components 42 to slide synchronously to the first position, the pushing surfaces 423 of the two pushing components 42 abut against the ends of the two guide shafts 325 to drive the pressing component 323 to switch to an idle state.

[0064] Alternatively, please refer to Figures 2 to 4 The flattening mechanism 3 includes two first compression springs, which are respectively sleeved on two guide shafts 325. The two first compression springs are used to ensure that the pressing member 323 always has a tendency to switch to the working state. This arrangement further improves the pressing reliability of the pressing member 323 on the paper 51.

[0065] As an alternative, the flattening mechanism 3 includes an operating part fixedly connected to the pressing member 323. The operating part is used by the operator to drive the pressing member 323 to switch between a working state and an idle state. With this configuration, the operator can manually control the operating part to switch the pressing member 323 between the working state and the idle state, which helps to reduce production costs.

[0066] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A printer, characterized in that, The device includes a paper roll support mechanism (1), a printing mechanism (2), and a flattening mechanism (3). The paper roll support mechanism (1) is used to support a paper roll (5). The printing mechanism (2) is used to print on a piece of paper (51) drawn from the paper roll (5). The flattening mechanism (3) includes a mounting frame (31) and a correction roller assembly (32) disposed on the mounting frame (31). Along the moving direction of the paper (51), the correction roller assembly (32) is located between the paper roll support mechanism (1) and the printing mechanism (2). The correction roller assembly (32) includes a first support roller (321), a second support roller (322), and a pressing member (323). Along the moving direction of the paper (51), the first support roller (321), the pressing member (323), and the second support roller (322) are arranged in sequence at intervals. The first support roller (321) and the second support roller (322) are used to support the first side of the paper (51). The pressing member (323) is movably connected to the mounting frame (31). The pressing member (323) includes a pressing shaft (324) for supporting the second side of the paper (51). The pressing member (323) can move relative to the mounting frame (31), and the pressing member (323) has a working state and an idle state. When the pressing member (323) is in the working state, the pressing shaft (324) is located on the first side of the center line connecting the first support roller (321) and the second support roller (322), and the paper (51) supported by the first support roller (321), the pressing shaft (324) and the second support roller (322) curls in the opposite direction to the curling direction of the paper roll (5), and the curling curvature of the paper (51) is greater than the maximum curling curvature of the paper roll (5). When the pressing member (323) is in the working state, the pressing shaft (324) is located on the first side of the center line connecting the first support roller (321) and the second support roller (322), and the paper (51) is curled in the opposite direction to the curling direction of the paper roll (5), and the curling curvature of the paper (51) is greater than the maximum curling curvature of the paper roll (5). In the idle state, the pressing shaft (324) is located on the second side of the center line connecting the first support roller (321) and the second support roller (322), such that the pressing shaft (324) does not generate a supporting force on the paper (51) or the paper (51) supported by the first support roller (321), the second support roller (322) and the pressing shaft (324) curls in the opposite direction to the curling direction of the paper roll (5), and the curling curvature of the paper (51) is less than the minimum curling curvature of the paper roll (5).

2. The printer of claim 1, wherein, The flattening mechanism (3) further includes a drive component (4), which is used to drive the pressing member (323) to switch to the working state or the idle state.

3. The printer of claim 2, wherein, The pressing member (323) is configured to always have a tendency to switch to the working state. The drive assembly (4) includes a motor (41) and a pusher (42). The motor (41) is mounted on the mounting bracket (31). The pusher (42) is movably connected to the mounting bracket (31). The pusher (42) is movable relative to the mounting bracket (31) and has a first position and a second position. The motor (41) is used to drive the pusher (42) to move relative to the mounting bracket (31) to the first position or the second position. When the pusher (42) moves to the first position, the pusher (42) abuts against the pressing member (323) and drives the pressing member (323) to move so that the pressing member (323) switches to the idle state. When the pusher (42) moves to the second position, the pusher (42) separates from the pressing member (323), and the pressing member (323) switches to the working state under the action of elastic force and / or gravity.

4. The printer of claim 3, wherein, Both the pressing member (323) and the pushing member (42) are slidably connected to the mounting bracket (31), and the sliding direction of the pushing member (42) from the second position to the first position is the same as the sliding direction of the pressing member (323) from the working state to the idle state.

5. The printer of claim 3, wherein, The pusher (42) is configured to always have a tendency to move toward the second position; The drive assembly (4) further includes a transmission assembly (43), which is configured to connect or disconnect the motor (41) and the pusher (42) in a transmission connection. When the motor (41) is connected to the pusher (42), the motor (41) drives the pusher (42) to move to the first position through the transmission assembly (43). When the motor (41) is disconnected from the pusher (42), the pusher (42) moves to the second position under the action of elastic force and / or gravity.

6. The printer of claim 5, wherein, The pusher (42) includes a straight toothed portion (422), and the transmission assembly (43) includes a first transmission wheel (431) and a second transmission wheel (432) that are coaxial and fixedly connected. The first transmission wheel (431) and the second transmission wheel (432) are both mounted on the mounting frame (31) and can rotate around their own axis. The first transmission wheel (431) is connected to the motor (41) for transmission. The outer peripheral surface of the second transmission wheel (432) is provided with a fan-shaped toothed portion (434). When the second transmission wheel (432) rotates within a first preset angle range, the fan-shaped toothed portion (434) is connected to the straight toothed portion (422) in a transmission connection, and the fan-shaped toothed portion (434) can drive the pusher (42) to slide to the first position; when the second transmission wheel (432) rotates within a second preset angle range, the fan-shaped toothed portion (434) is disconnected from the straight toothed portion (422) in a transmission connection, and the pusher (42) slides to the second position under the action of elastic force and / or gravity.

7. The printer of claim 6, wherein, The drive assembly (4) includes two pushers (42), and the drive assembly (4) also includes a transmission shaft (45), a first gear (46) and a second gear (47). The two pushers (42) are spaced apart along the width direction of the paper (51). The drive shaft (45) is supported by the mounting bracket (31) and can rotate relative to the mounting bracket (31) around its own axis. The first gear (46) and the second gear (47) are respectively fixedly sleeved with the two ends of the drive shaft (45), and the first gear (46) and the second gear (47) respectively mesh with the linear toothed portion (422) of the two pushers (42). When the second drive wheel (432) rotates within the first preset angle range, the fan-shaped toothed portion (434) meshes with the first gear (46). When the second drive wheel (432) rotates within the second preset angle range, the fan-shaped toothed portion (434) separates from the first gear (46).

8. The printer of claim 3, wherein, The pressing component (323) further includes two guide shafts (325), which are spaced apart along the width direction of the paper (51). Both guide shafts (325) are movably connected to the mounting frame (31) and can slide relative to the mounting frame (31) along the axial direction of the guide shafts (325). The two ends of the pressing shaft (324) are fixedly connected to one end of each of the two guide shafts (325). The pressing shaft (324), the first support roller (321), and the second support roller (322) are arranged in parallel.

9. The printer of claim 8, wherein, The flattening mechanism (3) also includes two first compression springs, which are respectively sleeved on the two guide shafts (325). The two first compression springs are used to ensure that the pressing member (323) always has a tendency to switch to the working state.

10. The printer of claim 1, wherein, The flattening mechanism (3) includes an operating part fixedly connected to the pressing member (323), the operating part being used by an operator to hold and drive the pressing member (323) to switch to the working state or the idle state.

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