A printer

Abstract

This invention discloses a printer, including a printing device and a paper holder device. The printing device is provided with a frame, and the paper holder device is provided with a support. The support is provided with a base plate, a first side plate, and a second side plate. The first side plate and the second side plate are respectively connected to both ends of the base plate. Each of the first side plate and the second side plate has a card slot at the end away from the base plate for holding a roll. The first side plate and / or the second side plate is provided with a mounting part. The rear and lower sides of the frame are provided with mating parts. During installation, the paper holder device can be selectively installed behind or below the printing device by connecting the mounting part of the support to the mating part on one side of the frame, according to actual needs, thereby meeting different paper feed direction requirements and improving ease of use.

Description

Technical Field

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

[0002] In related technologies, embedded printers are mainly used in various self-service terminals such as self-service kiosks, information query terminals, and testing instrument terminals to print media including inspection reports and various labels. The paper tray of this type of embedded printer is generally an external structure, embedded into the cabinet along with the printer during installation. However, existing embedded printer paper trays typically can only be installed in one direction, and cannot be changed to suit different installation needs, causing inconvenience in use. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a printer that can select the installation position of the paper holder device according to actual needs, thereby meeting the requirements of different paper feed directions.

[0004] A printer according to an embodiment of the present invention includes:

[0005] The printing unit is equipped with a rack;

[0006] A paper holder device is provided with a support frame, which is provided with a base plate, a first side plate and a second side plate. The first side plate and the second side plate are respectively connected to the two ends of the base plate. Each of the first side plate and the second side plate has a card slot at the end away from the base plate. The card slot is used to hold the roll.

[0007] The first side plate and / or the second side plate are provided with mounting parts, and the rear and lower sides of the frame are provided with mating parts. The bracket can be connected to the mating part on one side of the frame through the mounting parts, so that the paper holder device can be selectively installed behind or below the printing device.

[0008] A printer according to an embodiment of the present invention has at least the following beneficial effects:

[0009] During installation, the printer can be configured to be installed either behind or below the printer by connecting the mounting part of the bracket to the mating part on one side of the frame, depending on the actual needs. This allows the paper feed device to be selectively installed to meet different paper feed direction requirements and improve ease of use.

[0010] According to some embodiments of the present invention, the printing device is further provided with a buffer mechanism connected to the rear end of the frame, the buffer mechanism being provided with a buffer shaft that can move elastically, the buffer shaft being capable of tensioning the paper entering the frame.

[0011] According to some embodiments of the present invention, the buffer mechanism is further provided with a buffer frame and a buffer elastic element, the buffer frame being rotatably mounted on the frame, the buffer shaft being mounted on the buffer frame, and the buffer elastic element being connected between the buffer frame and the frame.

[0012] According to some embodiments of the present invention, the buffer mechanism is further provided with a buffer lever, which is connected to the outer side wall of the buffer frame.

[0013] According to some embodiments of the present invention, the paper holder device is installed below the frame, and the printing device is further provided with a guiding mechanism, which is located above the paper holder device. The paper is redirected from bottom to top by the guiding mechanism and then wrapped around the lower outer wall of the buffer shaft.

[0014] According to some embodiments of the present invention, the guiding mechanism includes a guide frame and a guide shaft, the guide frame being fixedly connected to the frame, and the guide shaft being mounted on the guide frame.

[0015] According to some embodiments of the present invention, the guiding mechanism is further provided with a roller, the roller being rotatably sleeved on the outside of the guiding shaft, and the paper being wrapped around the outer wall of the roller.

[0016] According to some embodiments of the present invention, the guiding mechanism is further provided with a guiding elastic element, the guiding frame is provided with a guiding groove, the end of the guiding shaft is slidably mounted in the guiding groove, one end of the guiding elastic element is connected to the guiding shaft, and the other end is connected to the guiding frame.

[0017] According to some embodiments of the present invention, the guide frame is provided with a guide fixing block, the guide fixing block is located above the guide groove, one end of the guide elastic member is connected to the guide fixing block, and the other end is connected to the end of the guide shaft.

[0018] According to some embodiments of the present invention, the bottom end of the card interface is provided with a downwardly extending slot, and the scroll can be inserted into the slot.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Additional aspects and advantages of the invention will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0021] Figure 1 This is a schematic diagram of the paper holder device of a printer installed at the rear of the printing device according to some embodiments of the present invention.

[0022] Figure 2 for Figure 1 A diagram showing the printer after the paper roll has been loaded.

[0023] Figure 3 for Figure 2 A diagram illustrating the paper feed of a printer.

[0024] Figure 4 This is a schematic diagram of the paper holder device of a printer installed below the printing device according to some embodiments of the present invention;

[0025] Figure 5 for Figure 4 A diagram showing the printer after the paper roll has been loaded.

[0026] Figure 6 for Figure 5 A diagram illustrating the paper feed of a printer.

[0027] Figure 7 This is a schematic diagram of the paper holder device according to some embodiments of the present invention;

[0028] Figure 8 for Figure 7 Enlarged diagram of point A in the diagram;

[0029] Figure 9 This is a schematic diagram illustrating the adjustment assembly of the paper holder device according to some embodiments of the present invention, which adjusts the distance between the first clamping member and the second clamping member.

[0030] Figure 10 This is an exploded view of the adjustment components according to some embodiments of the present invention (clamping plates omitted);

[0031] Figure 11 This is a schematic diagram of the gear structure in some embodiments of the present invention.

[0032] The attached icons are numbered as follows:

[0033] Paper holder device 100; bracket 110; first side plate 111; mounting part 1111; second side plate 112; base plate 113; card interface 114; clearance hole 115; notch 116; adjusting component 120; first clamping member 121; first rack 1211; second clamping member 122; second rack 1221; base 123; card slot 1231; gear 124; protrusion 1241; cantilever 1242; elastic element 125; second fastener 126; roll 130; paper running low sensor 140; mounting base 141; elongated hole 142; first fastener 143; sleeve 150; bushing 160;

[0034] 200 rolls of paper; 210 sheets of paper;

[0035] Printing device 300; frame 310; first mating part 311; second mating part 312; buffer mechanism 320; buffer shaft 321; buffer frame 322; buffer elastic element 323; buffer paddle 324; guide mechanism 330; guide shaft 331; guide frame 332; guide groove 3321; guide elastic element 333; roller 334. Detailed Implementation

[0036] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 limiting this invention.

[0038] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0039] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0040] In related technologies, embedded printers are mainly used in various self-service terminals such as self-service kiosks, information query terminals, and testing instrument terminals to print media including inspection reports and various labels. The paper tray of this type of embedded printer is generally an external structure, embedded into the cabinet along with the printer during installation. However, existing embedded printer paper trays typically can only be installed in one direction, and cannot be changed to suit different installation needs, causing inconvenience in use.

[0041] Therefore, the present invention proposes a printer that can select the installation position of the paper holder device according to actual needs, thereby meeting the requirements of different paper feeding directions.

[0042] Reference Figures 1 to 11This invention discloses a printer, which can be an embedded printer or other types of printer. It includes a printing device 300 and a paper holder device 100. The printing device 300 has a frame 310, which houses a motor and a printing roller. The paper holder device 100 can be selectively installed behind or below the frame 310. The paper holder device 100 includes a support 110, a roller 130, an adjustment assembly 120, and a paper low sensor 140. The support 110 has a base plate 113, a first side plate 111, and a second side plate 112. The first side plate 111 and the second side plate 112 are respectively connected to both ends of the base plate 113. Each of the first side plate 111 and the second side plate 112 has a card slot 114 at the end furthest from the base plate 113. The roll 130 is used to hold the paper roll 200. The two ends of the roll 130 along the axial direction are rotatably mounted on the card interface 114. The adjustment component 120 is provided with a base 123, a first clamping member 121 and a second clamping member 122. The first clamping member 121 and the second clamping member 122 are slidably connected to the base 123 and can be linked in opposite directions to clamp the paper roll 200. The paper shortage sensor 140 is installed on the first clamping member 121 or the second clamping member 122 to detect the amount of paper in the paper roll 200.

[0043] Reference Figure 1 Specifically, the first side plate 111 and / or the second side plate 112 of the bracket 110 are provided with mounting portions 1111, and the rear and lower sides of the frame 310 are provided with mating portions. The mating portion located on the rear side of the frame 310 is the first mating portion 311, and the mating portion located on the lower side of the frame 310 is the second mating portion 312. The mounting portion 1111 can be a mounting hole, and the mating portion can be a mating hole adapted to the mounting hole. Alternatively, the mounting portion 1111 can be a snap-fit, and the mating portion can be a snap-fit ​​hole adapted to the snap-fit. The mounting portion 1111 and the mating portion can also be other mounting structures. In some embodiments of the present invention, the mounting portion 1111 is a mounting hole, and the mating portion is a mating hole. During installation, fasteners are inserted through the mounting hole and the mating hole to install the paper holder device 100 onto the frame 310. For example, see reference... Figure 1 During installation, place the bracket 110 behind the frame 310, aligning the mounting hole with the mating hole on the rear side of the frame 310. Then, insert the fasteners through the mounting hole and the mating hole, thereby installing the paper holder device 100 behind the frame 310. (Refer to...) Figure 4 Of course, during installation, the bracket 110 can also be placed under the frame 310 so that the mounting hole and the mating hole on the lower side of the frame 310 are aligned, and then the fasteners are inserted into the mounting hole and the mating hole, so that the paper holder device 100 can be installed under the frame 310.

[0044] During installation, the printer allows the paper holder device 100 to be selectively installed behind or below the printing device 300 by fasteners passing through the mounting holes and mating holes on one side of the frame 310, thus meeting different paper feed direction requirements and improving ease of use. Furthermore, the paper holder device 100, equipped with an adjustment component 120, can adapt to paper rolls 200 of different widths by adjusting the positions of the first clamping member 121 and the second clamping member 122, making the paper holder device 100 more versatile and improving ease of use. Simultaneously, the paper-running sensor 140, installed on the first clamping member 121 or the second clamping member 122, can easily detect the paper level in the paper roll 200, thus promptly reminding the user to replace the paper roll 200 when the paper level is about to run out.

[0045] It should be noted that, due to the significant weight and inertia of the paper roll 200, during the initial printing phase, the motor of the printing device 300 drives the printing roller to feed the paper, thereby causing the paper roll 200 to rotate and feed the paper. Because of the high inertia of the paper roll 200 at startup, this can easily cause compression of the printed content during the initial printing phase, and also results in a large starting load on the motor. Therefore, referring to... Figures 1 to 3 In some embodiments of the present invention, the printing apparatus 300 is further provided with a buffer mechanism 320, which is connected to the rear end of the frame 310. The buffer mechanism 320 is provided with a buffer shaft 321 that can move elastically. The paper 210 is wrapped around the lower outer wall of the buffer shaft 321. The buffer shaft 321 can tension the paper 210 entering the frame 310, so that in the initial stage of printing, when the motor drives the paper 210 to feed, the buffer shaft 321 presses down on the paper 210, and the paper 210 exerts force on the buffer shaft 321. At this time, the buffer shaft 321 moves upward under the force, so that the paper 210 can continue to feed. This can buffer the inertial force of the paper roll 200, reduce the load of motor startup, and help improve the compression of the printed content in the initial stage of printing, thereby improving the printing quality. In addition, the buffer shaft 321 can keep the paper 210 close to it and keep the paper 210 taut during paper feeding, thereby reducing the noise caused by the vibration of the paper 210 during paper feeding. Furthermore, under the action of the buffer shaft 321, after the paper 210 passes from the paper holder device 100 through the buffer shaft 321 and enters the paper feed channel of the printing device 300, the paper 210 forms a certain paper feeding angle. During the paper feeding, under the tension of the printing roller of the printing device 300, it plays a certain shaping role, which helps to prevent the paper 210 from curling inward and improve the printing quality.

[0046] Reference Figure 1It is understood that in some embodiments of the present invention, the buffer mechanism 320 is provided with a buffer frame 322 and a buffer elastic element 323. The buffer frame 322 is rotatably mounted on the frame 310, the buffer shaft 321 is mounted on the buffer frame 322, and the buffer elastic element 323 is connected between the buffer frame 322 and the frame 310. The buffer elastic element 323 can be a spring, a rubber component, or other elastic element 125. One end of the buffer elastic element 323 is connected to the buffer frame 322, and the other end is connected to the frame 310. Specifically, one end of the buffer frame 322 is rotatably connected to the frame 310, and the other end of the buffer frame 322 is provided with a pin. One end of the buffer elastic element 323 is connected to the pin, and the other end is connected to the frame 310. The buffer frame 322 can swing around the frame 310 and return to its original position under the action of the buffer elastic element 323. Of course, an upper limit port can be provided at the upper end of the frame 310, and a lower limit port can be provided at the side end of the frame 310. When the printer is not in use, the buffer frame 322 can be swung above the upper limit slot. At this time, the buffer elastic element 323 can pull the buffer frame 322 into the upper limit slot, thereby preventing the buffer frame 322 from continuing to swing and reducing the space occupied by the buffer frame 322. When using the printer, after the paper 210 is automatically fed into the paper feed channel, the buffer frame 322 can be swung downward. At this time, under the action of the buffer elastic element 323, the buffer shaft 321 can press the paper 210 down to form a certain angle. Moreover, the buffer shaft 321 can automatically adjust the tension of the paper 210, buffer the impact force of paper feeding, improve the smoothness of paper feeding, and thus improve the printing quality.

[0047] Understandably, to facilitate the swinging of the buffer frame 322, in some embodiments of the present invention, the buffer mechanism 320 is further provided with a buffer lever 324. The buffer lever 324 is connected to the outer wall of the buffer frame 322. When it is necessary to move the buffer frame 322 to move the buffer shaft 321, the user can push the lever to easily swing the buffer frame 322. Of course, the printer can be an embedded printer, and its main body can be embedded in the housing. The housing can be provided with a lever notch 116 for avoiding the buffer lever 324. The user can easily push the buffer lever 324 through the lever notch 116 to swing the buffer frame 322.

[0048] Reference Figures 4 to 6It is understood that in some embodiments of the present invention, the paper holder device 100 is installed below the frame 310, and the buffer mechanism 320 is located above the paper holder device 100. Due to the change in the paper feeding direction, the buffer shaft 321 has difficulty pressing down on the paper 210. Therefore, the printing device 300 is also provided with a guide mechanism 330. The guide mechanism 330 is located above the paper holder device 100 and behind the buffer mechanism 320. The paper 210 is redirected from bottom to top through the guide mechanism 330 and then wrapped around the lower outer wall of the buffer shaft 321, so that the buffer shaft 321 can still press down on the paper 210 and realize the automatic adjustment of the tension of the paper 210.

[0049] Reference Figure 4 It is understood that, in some embodiments of the present invention, the guiding mechanism 330 includes a guide frame 332 and a guide shaft 331. The guide frame 332 is fixedly connected to the frame 310, and the guide shaft 331 is mounted on the guide frame 332. The guide shaft 331 is vertically higher than the height of the buffer shaft 321. The paper roll 200 is located below the guide frame 332. During paper feeding, the paper 210 wraps around the upper outer side of the guide shaft 331 from below, then tilts downwards and wraps around the lower outer side of the buffer shaft 321, and then tilts upwards into the paper feeding channel, so that the paper 210 can be fed from below.

[0050] Understandably, in order to reduce the friction of the paper 210 when it feeds on the guide shaft 331, in some embodiments of the present invention, the guide mechanism 330 is further provided with a roller 334. The roller 334 is rotatably sleeved on the outside of the guide shaft 331, and the paper 210 is wrapped around the outer wall of the roller 334. When the paper feeds, the paper 210 drives the roller 334 to rotate relative to the guide shaft 331, thereby reducing the resistance to paper feeding and improving the smoothness of paper feeding. Of course, there can be multiple rollers 334, with multiple rollers 334 side by side sleeved on the outer wall of the guide shaft 331, thereby increasing the contact area between the paper 210 and the roller 334, which is beneficial to further improving the smoothness of paper feeding.

[0051] Reference Figure 4It is understood that, in order to reduce the impact force of paper feeding, in some embodiments of the present invention, the guide mechanism 330 is further provided with a guide elastic element 333, the guide frame 332 is provided with a guide groove 3321, the end of the guide shaft 331 is slidably installed in the guide groove 3321, one end of the guide elastic element 333 is connected to the guide shaft 331, and the other end is connected to the guide frame 332. Specifically, both sides of the guide frame 332 are provided with guide grooves 3321, and both ends of the guide shaft 331 are slidably installed in the corresponding guide grooves 3321. Two guide elastic elements 333 are also provided accordingly. The guide elastic element 333 can be a spring, a rubber component, an elastic metal sheet, or other elastic element 125. The guide shaft 331 can move along the guide groove 3321 under the action of the guide elastic element 333, thereby buffering the impact force of paper feeding and improving the smoothness of paper feeding.

[0052] Understandably, to ensure a more secure installation of the guide elastic element 333, in some embodiments of the present invention, the guide frame 332 is provided with a guide fixing block, which is located above the guide groove 3321. One end of the guide elastic element 333 is connected to the guide fixing block, and the other end is connected to the end of the guide shaft 331. In this case, the guide shaft 331 is suspended below the guide fixing block by the guide elastic element 333. Specifically, the guide elastic element 333 is a tension spring, and the outer wall of the guide fixing block has an embedding groove, into which the end of the tension spring can be embedded, thereby making the connection between the tension spring and the guide fixing block more reliable.

[0053] Reference Figure 6 It is understood that when the paper holder device 100 is installed below the frame 310, in order to prevent the roll 130 from easily falling out of the card slot 114, in some embodiments of the present invention, the bottom end of the card slot 114 is provided with a downwardly extending slot, into which the roll 130 can be inserted. When the roll 130 is placed at the bottom end of the card slot 114, under the action of gravity, the roll 130 can be inserted into the slot, thereby preventing the roll 130 from easily falling out of the card slot 114 and improving the reliability of the paper roll 200 installation.

[0054] Reference Figures 7 to 11The paper feeder device 100 of this embodiment is used to feed paper to a printer. The paper feeder device 100 includes a support 110, a roll 130, an adjustment assembly 120, and a paper low sensor 140. Specifically, the support 110 is provided with a base plate 113, a first side plate 111, and a second side plate 112. The first side plate 111 and the second side plate 112 are respectively connected to both ends of the base plate 113. Each of the first side plate 111 and the second side plate 112 has a locking interface 114 at the end away from the base plate 113. The locking interface 114 is approximately U-shaped, facilitating the insertion of the roll 130. The support 110 can be a sheet metal part. During processing, the sheet metal can be integrally formed into the first side plate 111, the second side plate 112, and the base plate 113 through processes such as stamping and bending, thereby increasing the structural strength of the support 110 and enabling it to hold larger paper rolls 200.

[0055] Reference Figure 2 and Figure 7 It is understandable that the paper roll 200 is usually cylindrical with a hollow core in the middle. Therefore, the paper roll 200 is usually placed in the core through the spool 130. At the same time, the two ends of the spool 130 along the axial direction can be rotatably installed on the card interface 114, so that the paper roll 200 can rotate relative to the bracket 110 and continuously feed paper to the printing device 300.

[0056] Reference Figure 7 , Figure 9 and Figure 10 The adjustment assembly 120 includes a base 123, a first clamping member 121, and a second clamping member 122. The first clamping member 121 and the second clamping member 122 are slidably connected to the base 123 and can move in opposite directions, thereby accommodating paper rolls 200 of different widths and clamping the paper rolls 200 to prevent them from swaying axially. Specifically, the first clamping member 121 and the second clamping member 122 have roughly the same structure, both including a sliding block and a clamping plate. The clamping plate is fixed to the sliding block, and the sliding block is slidably mounted on the base 123.

[0057] Reference Figure 7 and Figure 8 The paper-running sensor 140 is mounted on the first clamping member 121 or the second clamping member 122 to detect the amount of paper in the paper roll 200. When the paper in the paper roll 200 is about to run out of paper, the paper-running sensor 140 sends a signal to the printer's control system. The control system can then remind the user to change the paper in time by ringing a bell or lighting a light. Because the paper-running sensor 140 is mounted on the first clamping member 121 or the second clamping member 122, it can be closer to the paper roll 200, which helps improve the accuracy of detection. Moreover, it can move with the first clamping member 121 or the second clamping member 122 to detect paper rolls of different widths 200.

[0058] The paper holder device 100, by being equipped with an adjustment component 120, can adapt to paper rolls 200 of different widths by adjusting the positions of the first clamping member 121 and the second clamping member 122, thus making the paper holder device 100 more versatile and improving ease of use. At the same time, the paper-running sensor 140 is installed on the first clamping member 121 or the second clamping member 122, which can conveniently detect the amount of paper in the paper roll 200, so that when the paper in the paper roll 200 is about to run out, it can promptly remind the user to replace the paper roll 200.

[0059] Reference Figure 8 It should be noted that the paper-running sensor 140 determines whether the paper roll 200 is about to run out of paper by detecting the thickness of the paper roll 200. Therefore, when the paper holder device 100 holds paper rolls 200 with different paper weights, the installation position of the paper-running sensor 140 must be adjusted accordingly. For this purpose, in some embodiments of the present invention, the paper-running sensor 140 is provided with a mounting base 141, which has an elongated hole 142. The first side plate 111 or the second side plate 112 has a connecting hole. The paper-running sensor 140 is installed in an adjustable position on the first side plate 111 or the second side plate 112 by passing through the elongated hole 142 and the connecting hole with a first fastener 143. The first fastener 143 can be a bolt, screw, or other fastener. Specifically, when it is necessary to adjust the installation position of the paper-running sensor 140, simply loosen the first fastener 143 to release the first fastener 143 from limiting the mounting base 141, then move the paper-running sensor 140 so that it moves relative to the first fastener 143 through the elongated hole 142, thereby moving the paper-running sensor 140 to the appropriate position, and then tighten the first fastener 143 to fix the paper-running sensor 140 in the required position, making the adjustment quick and convenient.

[0060] Reference Figure 8 and Figure 9 It is understood that, in order to make the overall size of the paper holder device 100 smaller, in some embodiments of the present invention, the first side plate 111 or the second side plate 112 is provided with a clearance hole 115, and the paper-running sensor 140 can pass through the clearance hole 115. This avoids reserving a space between the first side plate 111 and the second side plate 112 to accommodate the paper-running sensor 140, reduces the distance between the first side plate 111 and the second side plate 112, and helps to reduce the overall size of the paper holder device 100, improve the compactness of the paper holder device 100, make the paper holder device 100 occupy less space, and improve the convenience of installation.

[0061] Reference Figure 9 and Figure 10It is understood that, in order to enable the first clamping member 121 and the second clamping member 122 to achieve smooth reverse linkage, in some embodiments of the present invention, the adjusting assembly 120 is further provided with a gear 124, the sliding block of the first clamping member 121 is provided with a first rack 1211, and the sliding block of the second clamping member 122 is provided with a second rack 1221. The first rack 1211 and the second rack 1221 are respectively meshed on opposite sides of the gear 124. When the first clamping member 121 moves to the left, the first clamping member 121 drives the gear 124 to rotate, and the gear 124 drives the second clamping member 122 to move to the right, thereby realizing the reverse linkage of the first clamping member 121 and the second clamping member 122. Of course, when the second clamping member 122 moves in a certain direction, it can also drive the first clamping member 121 to move in the opposite direction through the gear 124. With the above settings, the first clamping member 121 and the second clamping member 122 can move synchronously in opposite directions, thereby clamping paper rolls 200 of different widths.

[0062] Reference Figure 10It is understood that, in order to ensure that the first clamping member 121 and the second clamping member 122 are positioned and thus prevent undesirable movement, in some embodiments of the present invention, the inner wall of the base 123 is provided with a slot 1231, and the end of the gear 124 facing the base 123 is provided with a protrusion 1241. The protrusion 1241 can be a protrusion, a protruding post, or a protruding ridge, etc., and the slot 1231 is a structure adapted to the protrusion 1241. The adjusting assembly 120 is also provided with an elastic member 125, which can drive the gear 124 closer to the base 123, so that the protrusion 1241 is engaged in the slot 1231 and the rotation of the gear 124 is restricted, thereby limiting the first clamping member 121 and the second clamping member 122 and preventing unnecessary movement. For example, it can prevent the vibration generated during the operation of the printer from causing the first clamping member 121 or the second clamping member 122 to move. Of course, if it is necessary to adjust the position of the first clamping member 121 or the second clamping member 122, it is only necessary to push the first clamping member 121 or the second clamping member 122 with a little force, so that the protrusion 1241 can be released from the slot 1231, releasing the restriction on the gear 124, allowing the gear 124 to continue to rotate, thereby allowing the first clamping member 121 and the second clamping member 122 to move in opposite directions. Specifically, the gear 124 has a through hole in the middle, and the second fastener 126 passes through the through hole of the gear 124 and is connected to the base 123. One end of the elastic member 125 abuts against the second fastener 126, and the other end abuts against the gear 124, so that the elastic member 125 can push the gear 124 against the inner wall of the base 123, so that the protrusion 1241 is engaged in the slot 1231. The elastic element 125 can be a compression spring, and the second fastener 126 can be a bolt. The compression spring is sleeved on the outside of the bolt stud, with one end abutting against the bolt nut and the other end abutting against the gear 124. The compression spring is normally under pressure, which makes it tend to push the gear 124 toward the base 123.

[0063] Reference Figure 11 Understandably, in order to prevent the protrusion 1241 from jamming when engaged in the slot 1231 and thus reduce the force required to adjust the position of the first clamping member 121 or the second clamping member 122, in some embodiments of the present invention, the gear 124 is provided with a cantilever 1242, and the end of the cantilever 1242 is provided with a protrusion, which constitutes the protrusion 1241. By providing the cantilever 1242, the gear 124 allows the cantilever 1242 to elastically deform when the protrusion 1241 is subjected to force, thereby allowing the protrusion 1241 to disengage from the slot 1231, preventing the protrusion 1241 from jamming in the slot 1231 and reducing the resistance to adjustment.

[0064] Of course, it should be noted that there can be multiple cantilever arms 1242. Multiple cantilever arms 1242 are arranged circumferentially along the upper end of gear 124. Each cantilever arm 1242 has a protrusion at its free end. Correspondingly, the inner wall of the base 123 has multiple slots 1231. The multiple slots 1231 are arranged in a ring. The number of slots 1231 is greater than the number of protrusions, so that when gear 124 rotates at a very small angle, the protrusions can be engaged in the slots 1231, which helps to improve the positioning accuracy of the first clamping member 121 and the second clamping member 122.

[0065] Reference Figure 9 It is understood that, in order to facilitate the user in adjusting the position of the first clamping member 121 or the second clamping member 122, in some embodiments of the present invention, the first side plate 111 and / or the second side plate 112 have a notch 116, which allows the user to reach into the notch 116 to push or pull the first clamping member 121 or the second clamping member 122, thereby adjusting the position of the first clamping member 121 or the second clamping member 122 and improving the convenience of operation.

[0066] Reference Figure 7 and Figure 9 It is understood that different core specifications of paper rolls 200 require different outer diameters of the roll shaft 130. In some embodiments of the present invention, the paper holder device 100 is further provided with a sleeve 150, which can be fitted onto the outer wall of the roll shaft 130. Specifically, the inner wall of the sleeve 150 is provided with a locking groove, and the outer wall of the roll shaft 130 is provided with a matching locking block. Therefore, after the sleeve 150 is fitted onto the roll shaft 130, it can prevent the sleeve 150 from rotating relative to the roll shaft 130, thereby improving the stability of the sleeve 150 installed on the roll shaft 130. When the inner diameter of the core of the paper roll 200 is small, the core can be directly fitted onto the outer wall of the roll shaft 130. When the inner diameter of the core of the paper roll 200 is relatively large, the sleeve 150 can be fitted onto the outer wall of the roll shaft 130 first, and then the core can be fitted onto the outer wall of the sleeve 150, so that the paper holder device 100 can hold cores of different specifications. Of course, multiple sleeves 150 with different outer diameters can be set according to the number of inner diameter specifications of the core, so that the paper holder device 100 can be adapted to more specifications of cores.

[0067] Reference Figure 8It is understood that, in order to reduce wear caused by friction between the roll 130 and the bracket 110 during rotation, in some embodiments of the present invention, the paper holder device 100 is also provided with bushings 160. There are two bushings 160, which are respectively sleeved on both ends of the roll 130. The roll 130 can be rotatably mounted on the card interface 114 through the bushings 160. The bushings 160 are made of wear-resistant metal material, which reduces the friction between them and the bracket 110, making the rotation of the roll 130 smoother. At the same time, it can prevent the roll 130 from directly contacting the bracket 110, which is beneficial to improving the service life of the roll 130.

[0068] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A printer, characterized in that, include: The printing unit is equipped with a rack; A paper holder device is provided with a support frame, which includes a base plate, a first side plate, and a second side plate. The first and second side plates are respectively connected to the two ends of the base plate. Each of the first and second side plates has a locking interface at its end away from the base plate for holding a paper roll. The paper holder device is also equipped with an adjustment assembly, which includes a base, a first clamping member, and a second clamping member. The first and second clamping members are slidably connected to the base and can move in opposite directions to clamp the paper roll. The adjustment assembly also includes a gear. The sliding block of the first clamping member has a first rack, and the sliding block of the second clamping member has a second rack. The first and second racks mesh with opposite sides of the gear. The inner wall of the base has a slot, and the end of the gear facing the base has a protrusion. The slot is designed to fit the protrusion. The adjustment assembly also includes an elastic element that drives the gear closer to the base so that the protrusion engages in the slot, restricting the gear's rotation. The first side plate and / or the second side plate are provided with mounting parts, and the rear and lower sides of the frame are provided with mating parts. The bracket can be connected to the mating part on one side of the frame through the mounting parts, so that the paper holder device can be selectively installed behind or below the printing device.

2. A printer according to claim 1, characterized in that, The printing device is also provided with a buffer mechanism, which is connected to the rear end of the frame. The buffer mechanism is provided with a buffer shaft that can move elastically and can tension the paper entering the frame.

3. A printer according to claim 2, characterized in that, The buffer mechanism is further provided with a buffer frame and a buffer elastic element. The buffer frame is rotatably mounted on the frame, the buffer shaft is mounted on the buffer frame, and the buffer elastic element is connected between the buffer frame and the frame.

4. A printer according to claim 3, characterized in that, The buffer mechanism is also provided with a buffer lever, which is connected to the outer wall of the buffer frame.

5. A printer according to any one of claims 2 to 4, characterized in that, The paper holder device is installed below the frame, and the printing device is also provided with a guide mechanism. The guide mechanism is located above the paper holder device, and the paper is redirected from bottom to top by the guide mechanism and then wrapped around the lower outer wall of the buffer shaft.

6. A printer according to claim 5, characterized in that, The guiding mechanism includes a guide frame and a guide shaft. The guide frame is fixedly connected to the frame, and the guide shaft is mounted on the guide frame.

7. A printer according to claim 6, characterized in that, The guiding mechanism is also provided with a roller, which is rotatably sleeved on the outside of the guide shaft, and the paper is wrapped around the outer wall of the roller.

8. A printer according to claim 6, characterized in that, The guiding mechanism is further provided with a guiding elastic element, the guiding frame is provided with a guiding groove, the end of the guiding shaft is slidably mounted in the guiding groove, one end of the guiding elastic element is connected to the guiding shaft, and the other end is connected to the guiding frame.

9. A printer according to claim 8, characterized in that, The guide frame is provided with a guide fixing block, which is located above the guide groove. One end of the guide elastic element is connected to the guide fixing block, and the other end is connected to the end of the guide shaft.

10. A printer according to claim 5, characterized in that, The bottom end of the card interface is provided with a downward-extending slot, into which the scroll can be inserted.

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