Printer

Abstract

The utility model relates to a printer, which comprises a printer body, and a paper bin used for accommodating printing paper is formed at the top of the printer body; the paper shaft assembly comprises a rotating shaft part and a bearing part, the rotating shaft part is rotationally connected to the machine body through the bearing part, at least part of the rotating shaft part is located in the paper bin, and the rotating shaft part is used for being connected with a shaft hole of printing paper in an inserted mode so as to suspend the printing paper in the paper bin; the rubber roller is arranged on the machine body and used for pulling the printing paper in the paper bin to be output outwards; and the printing head assembly corresponds to the rubber roller. According to the printer, when the printing paper is loaded into the paper bin, the rotating shaft part can be inserted into the shaft hole of the printing paper to form a support to suspend the printing paper in the paper bin, when the printing paper is dragged by the rubber roller for printing output, direct large-area friction between the printing paper and the inner surface of the paper bin can be avoided, and meanwhile, the rotating shaft part can cooperate with the printing paper to cooperatively rotate; the friction force between the rotating shaft part and the machine body can be reduced through the arrangement of the bearing part, so that the printing paper can be smoothly dragged to rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of printing equipment, in particular to a printer. Background Art

[0002] In recent years, with the rapid development of food delivery platforms, the food delivery industry in China has experienced explosive growth. The traditional food delivery method is for merchants to prepare goods and food delivery orders and hand them over to the delivery staff for delivery. Therefore, with the emergence of smart cloud printers, merchants have solved the tediousness of handwritten orders and telephone orders. Among them, thermal smart cloud printers use thermal printing technology, using heating components to selectively heat specific positions of thermal paper to print the required pattern. It has the advantages of convenient replacement of consumables, fast printing speed and small size, which further improves the work efficiency of users.

[0003] When using traditional thermal printers, the rolled thermal paper is usually placed directly into the paper bin, and then one end of the thermal paper is passed through the print head and the transmission mechanism to be pulled for printing. Because the rolled thermal paper is placed directly into the paper bin, the paper roll itself is heavy, and the surface of the paper will contact the inner wall of the paper bin over a large area, resulting in great friction between them. In addition, the printing speed is very fast, which puts great pressure on the print head and the transmission mechanism. After long-term printing, the device is easily worn out, resulting in loud working noise and slow order output, which reduces the user experience. Utility Model Content

[0004] Based on this, it is necessary to provide a printer to address the problem that the printing paper of some current printers contacts the inner wall of the paper bin over a large area after assembly, resulting in large friction between them, causing great pressure on the print head and transmission mechanism, which is not conducive to the operation of the printer.

[0005] A printer comprises: a machine body, a paper bin for accommodating printing paper is formed on the top of the machine body; a paper shaft assembly, the paper shaft assembly comprises a rotating shaft portion and a bearing portion, the rotating shaft portion is rotatably connected to the machine body through the bearing portion, at least part of the rotating shaft portion is located in the paper bin, the rotating shaft portion is used to be plugged into the shaft hole of the printing paper to suspend the printing paper in the paper bin; a rubber roller, the rubber roller is arranged on the machine body, the rubber roller is used to pull the printing paper in the paper bin to output it outward; a print head assembly, the print head assembly is arranged on the machine body, and the print head assembly corresponds to the rubber roller.

[0006] The present application provides a printer, wherein a paper shaft assembly is provided on a machine body, wherein the paper shaft assembly includes a rotating shaft portion and a bearing portion, wherein at least a portion of the rotating shaft portion is located in a paper bin and is rotatably connected to the machine body through the bearing portion, so that when the printing paper is loaded into the paper bin, the rotating shaft portion can be plugged into the shaft hole of the printing paper to form a support, and the printing paper will be suspended in the paper bin. When the rubber roller pulls the printing paper for print output, the printing paper can avoid direct large-area friction with the inner surface of the paper bin, and at the same time, the rotating shaft portion can cooperate with the printing paper to rotate in coordination. The setting of the bearing portion can reduce the friction between the rotating shaft portion and the machine body, thereby the printing paper can be smoothly pulled and rotated, so that the pressure on the rubber roller assembly and the print head is reduced, which is conducive to stable operation, improves the service life of the device, and can effectively prevent paper jams, thereby improving the user experience.

[0007] In one embodiment, the bearing portion includes a first connection seat, a second connection seat and a rolling body, the first connection seat is arranged on the machine body, the second connection seat is coaxially arranged on the shaft portion, the end of the second connection seat away from the shaft portion is connected to the first connection seat through the rolling body, and the second connection seat can rotate relative to the first connection seat under the drive of the shaft portion. The first connection seat and the second connection seat are respectively adapted to be installed with the machine body and the shaft portion, a rolling body is arranged between the first connection seat and the second connection seat, and the second connection seat can rotate relative to the first connection seat, so that when the printing paper is pulled by the rubber roller to drive the shaft portion to rotate, the bearing portion can convert the sliding friction between the shaft portion and the machine body into rolling friction, so that the friction resistance is reduced, thereby reducing the noise and reducing the wear.

[0008] In one embodiment, the paper shaft assembly further includes a spring, the two ends of which are respectively against the shaft portion and the second connection seat, the shaft portion can be telescopic relative to the second connection seat, and when the shaft portion approaches the second connection seat, the spring is compressed and generates elastic force. The shaft portion can be telescopic relative to the bearing portion, and when the user loads the printing paper into the paper bin, he only needs to put the printing paper vertically, and the side of the printing paper will squeeze the shaft portion so that the shaft portion approaches the second connection seat until the paper tube shaft hole of the printing paper is aligned with the shaft portion, and the squeezing of the shaft portion disappears. Under the action of the elastic restoring force of the spring, the shaft portion extends into the paper tube shaft hole to form a plug-in fit, so that the printing paper can be suspended in the paper bin. By adopting the above structure, there is no need to disassemble the paper shaft assembly when changing paper, which can make the paper changing operation simple and quick, and there is no need to reserve a avoidance space in the paper bin for the assembly of the shaft portion and the printing paper, which is conducive to reducing the size of the printer.

[0009] In one embodiment, a connecting wall is formed on one of the rotating shaft part and the second connecting seat, and a first sliding groove is provided on the connecting wall along the axial direction of the rotating shaft part, and a protrusion is formed on the other of the rotating shaft part and the second connecting seat, and the protrusion is slidably inserted in the first sliding groove. By forming a connecting wall and a protrusion on the rotating shaft part and the second connecting seat respectively, the connecting wall is provided with a first sliding groove, and the protrusion is located in the first sliding groove to form a limiting effect, so that the rotating shaft part can stably extend and retract relative to the second connecting seat along the length direction of the first sliding groove, which facilitates the installation of the printing paper and the rotating shaft part, and through the cooperation of the protrusion and the first sliding groove, when the rotating shaft part rotates, the protrusion abuts against the side wall of the first sliding groove, thereby driving the second connecting seat to rotate.

[0010] In one embodiment, the connecting wall encloses a first positioning groove, and the rotating shaft portion or the second connecting seat is movably inserted into the first positioning groove. The formation of the first positioning groove can facilitate the positioning and assembly of the rotating shaft portion and the second connecting seat, which is conducive to improving the installation efficiency.

[0011] In one embodiment, there are multiple first slide grooves, and the multiple first slide grooves are arranged at intervals along the circumference of the first positioning groove. The number of the protrusions is consistent with the number of the first slide grooves and is arranged in a one-to-one correspondence.

[0012] In one embodiment, the spring is located in the first positioning groove.

[0013] In one embodiment, the projection is provided with a chamfer, so that when the projection is inserted into and leaves the first slide groove, the hard interference between the projection and the connecting wall can be reduced to reduce damage to the projection or the connecting wall.

[0014] In one embodiment, the machine body is provided with a mounting groove connected to the paper bin, the bearing portion and / or the shaft portion is arranged in the mounting groove, and one end of the shaft portion away from the bearing portion extends into the paper bin. By providing a mounting groove on the machine body for installing the paper shaft assembly, the positioning and assembly of the paper shaft assembly can be facilitated, thereby facilitating installation efficiency.

[0015] In one embodiment, when the bearing portion and the shaft portion are arranged in the mounting groove, the shaft portion abuts against the outer side of the side wall of the paper bin, the bearing portion abuts against the side wall of the mounting groove away from the paper bin, the side wall of the paper bin is provided with a through hole connected to the mounting groove, and one end of the shaft portion away from the bearing portion extends into the paper bin through the through hole. By adopting the above structure, when the paper shaft assembly is installed in the mounting groove, the two ends of the paper shaft assembly will be squeezed by the outer side wall of the paper bin and the side wall of the mounting groove respectively, so that the spring is compressed until the shaft portion is opposite to the through hole on the side wall of the paper bin, and the squeezing of the shaft portion is weakened. Under the action of the elastic restoring force of the spring, the shaft portion quickly passes through the through hole and plugs into the through hole to form a limiting effect, thereby realizing the rapid installation of the shaft assembly and not easy to loosen.

[0016] In one embodiment, the installation groove is formed by the bottom wall of the body being recessed inwards, thereby realizing the hidden setting of the paper shaft assembly, avoiding the simultaneous exposure of the paper shaft assembly when the paper bin is exposed, reducing the risk of the paper shaft assembly being contaminated, and making the device more concise and beautiful.

[0017] In one embodiment, the shaft portion or the second connection seat is formed with a positioning column, and the spring is sleeved outside the positioning column. By forming the positioning column for plugging and matching with the spring, the positioning and installation of the spring can be facilitated, so that the spring can stably perform telescopic activities and is not easy to bend or separate from the shaft portion or the second connection seat.

[0018] In one embodiment, the shaft portion or the second connection seat is provided with a first receiving groove, and at least part of the spring is inserted into the first receiving groove. The provision of the first receiving groove facilitates the positioning and installation of the spring, so that the spring is not easily separated from the shaft portion or the second connection seat when it is extended or retracted.

[0019] In one embodiment, the first connection seat and / or the second connection seat is provided with a second positioning groove, and the rolling body is rollingly arranged in the second positioning groove. The second positioning groove can be arranged to position the rolling body, which can facilitate the assembly of the rolling body with the first connection seat and / or the second connection seat to improve the installation efficiency, and the second positioning groove can limit the rolling body to ensure that the rolling body will not deviate when the bearing part is working, thereby ensuring the smooth rotation of the shaft part.

[0020] In one embodiment, lubricating oil is provided in the bearing part. When the second connection seat rotates and the rolling body rolls, the lubricating oil can further reduce the friction resistance and ensure smooth movement. In addition, the rolling body can be adhered to the second connection seat or the first connection seat by the lubricating oil. The rolling body can be temporarily arranged on the second connection seat or the first connection seat under the action of the viscous lubricating oil without falling, thereby facilitating the assembly of the bearing part.

[0021] In one embodiment, the first connection seat is provided with a second receiving groove, and the rolling element, the second connection seat and / or the rotating shaft are movably arranged in the second receiving groove. The second receiving groove is provided on the first connection seat to facilitate the positioning and assembly of the second connection seat, and at the same time, the rolling element, the second connection seat and / or the rotating shaft are protected to prevent foreign matter from invading the interior of the paper shaft assembly and hindering the expansion and contraction of the rotating shaft, as well as the movement of the second connection seat and the rolling element.

[0022] In one embodiment, the rolling element is at least one of a ball, a needle, a cylindrical roller and a tapered roller.

[0023] In one embodiment, the outer wall of the bearing portion is formed with a connecting ear, the connecting ear is provided with a first connecting hole, the body is provided with a second connecting hole, and the first connecting hole and the second connecting hole are matched to connect the bearing portion and the body through a fastener. By adopting the above structure, the first connecting hole and the second connecting hole can provide a stable connection between the bearing portion and the body through the fastener, which can ensure that the connected parts will not be easily separated when accidentally subjected to force.

[0024] In one embodiment, the end of the shaft away from the bearing is spherical. By setting the connection end of the shaft and the printing paper shaft hole to a spherical design, on the one hand, it can avoid hard interference between the printing paper roll and the shaft during paper changing operation, causing jamming or damage to the device or printing paper, and on the other hand, the spherical setting can better match the printing paper rolls with different hole sizes for plug-in matching.

[0025] In one embodiment, there are two paper shaft assemblies, which are respectively located on opposite sides of the paper bin. By adopting the above structure, both sides of the printing paper can be supported by the paper shaft assemblies, the installation is more secure, and the two sets of paper shaft assemblies can better cooperate with the rubber roller to pull and output the printing paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a perspective view of a printer according to one embodiment;

[0027] Figure 2 is a cross-sectional view of a printer according to one embodiment;

[0028] Figure 3 An exploded view of a printer according to an embodiment;

[0029] Figure 4 is a cross-sectional view of a paper shaft assembly according to one embodiment;

[0030] Figure 5 An exploded view of a paper shaft assembly according to one embodiment;

[0031] Figure 6 is a three-dimensional view of a rotating shaft portion of an embodiment;

[0032] Figure 7 is a three-dimensional diagram of a second connecting socket in one embodiment;

[0033] Figure 8 It is a three-dimensional view of a first connecting socket according to one embodiment.

[0034] The corresponding relationship between the reference numerals and the component names is as follows:

[0035] 1 body, 101 paper bin, 102 mounting slot, 103 through hole, 104 second connecting hole;

[0036] 2 paper shaft assembly, 201 first slide groove, 202 first positioning groove, 203 first accommodating groove, 204 second positioning groove, 205 second accommodating groove, 206 first connecting hole, 21 rotating shaft portion, 211 connecting wall, 212 positioning column, 22 bearing portion, 221 first connecting seat, 2211 connecting ear, 222 second connecting seat, 2221 protrusion, 223 rolling body, 23 spring. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0039] The printers according to some embodiments of the present invention will be described below with reference to the accompanying drawings.

[0040] like Figure 1 and Figure 2 As shown, this embodiment discloses a printer, comprising: a body 1, a paper bin 101 for accommodating printing paper is formed on the top of the body 1; a paper shaft assembly 2, the paper shaft assembly 2 comprises a shaft portion 21 and a bearing portion 22, the shaft portion 21 is rotatably connected to the body 1 through the bearing portion 22, at least a part of the shaft portion 21 is located in the paper bin 101, the shaft portion 21 is used to be plugged into the shaft hole of the printing paper to suspend the printing paper in the paper bin 101; a rubber roller, the rubber roller is arranged on the body 1, the rubber roller is used to pull the printing paper in the paper bin 101 to output it outwardly; a print head assembly, the print head assembly is arranged on the body 1, and the print head assembly corresponds to the rubber roller.

[0041] The present application provides a printer, wherein a paper shaft assembly 2 is provided on a machine body 1, and the paper shaft assembly 2 includes a rotating shaft portion 21 and a bearing portion 22. At least a portion of the rotating shaft portion 21 is located in a paper bin 101 and is rotatably connected to the machine body 1 through the bearing portion 22. Therefore, when the printing paper is loaded into the paper bin 101, the rotating shaft portion 21 can be plugged into the shaft hole of the printing paper to form a support, and the printing paper will be suspended in the paper bin 101. When the rubber roller pulls the printing paper for printing output, the printing paper can avoid direct large-area friction with the inner surface of the paper bin 101. At the same time, the rotating shaft portion 21 can cooperate with the printing paper to rotate in coordination. The setting of the bearing portion 22 can reduce the friction between the rotating shaft portion 21 and the machine body 1, thereby the printing paper can be smoothly pulled and rotated, so that the pressure on the rubber roller assembly and the print head is reduced, which is conducive to stable operation, improves the service life of the device, and can effectively prevent paper jams, so that the user experience is improved.

[0042] like Figure 4 and Figure 5 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the bearing portion 22 includes a first connection seat 221, a second connection seat 222 and a rolling body 223, the first connection seat 221 is arranged on the machine body 1, the second connection seat 222 is coaxially arranged on the shaft portion 21, the end of the second connection seat 222 away from the shaft portion 21 is connected to the first connection seat 221 through the rolling body 223, and the second connection seat 222 can rotate relative to the first connection seat 221 under the drive of the shaft portion 21. The first connection seat 221 and the second connection seat 222 are respectively adapted and installed with the machine body 1 and the shaft portion 21, and the rolling body 223 is arranged between the first connection seat 221 and the second connection seat 222, and the second connection seat 222 can rotate relative to the first connection seat 221, so that when the printing paper is pulled by the rubber roller to drive the shaft portion 21 to rotate, the bearing portion 22 can convert the sliding friction between the shaft portion 21 and the machine body 1 into rolling friction, so that the friction resistance is reduced, thereby reducing noise and reducing wear.

[0043] like Figure 2 and Figure 5As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the paper shaft assembly 2 also includes a spring 23, the two ends of the spring 23 are respectively against the shaft portion 21 and the second connection seat 222, the shaft portion 21 can be extended and retracted relative to the second connection seat 222, and when the shaft portion 21 approaches the second connection seat 222, the spring 23 is compressed and generates elastic force. The shaft portion 21 can be extended and retracted relative to the bearing portion 22, and when the user loads the printing paper into the paper bin 101, he only needs to put the printing paper vertically, and the side of the printing paper will squeeze the shaft portion 21 so that the shaft portion 21 approaches the second connection seat 222, until the paper tube shaft hole of the printing paper is aligned with the shaft portion 21, and the squeezing of the shaft portion 21 disappears, and under the elastic restoring force of the spring 23, the shaft portion 21 extends into the paper tube shaft hole to form a plug-in fit, so that the printing paper can be suspended in the paper bin 101. By adopting the above structure, the paper shaft assembly 2 does not need to be removed when changing paper, which can make the paper changing operation simple and quick, and no avoidance space is required in the paper bin 101 for the assembly of the rotating shaft portion 21 and the printing paper, which is conducive to reducing the size of the printer body 1.

[0044] like Figures 4 to 7 As shown, in addition to the features of the above-mentioned embodiments, this embodiment further defines: one of the rotating shaft portion 21 and the second connecting seat 222 is formed with a connecting wall 211, the connecting wall 211 is provided with a first sliding groove 201 along the axial direction of the rotating shaft portion 21, and the other of the rotating shaft portion 21 and the second connecting seat 222 is formed with a protrusion 2221, and the protrusion 2221 is slidably inserted in the first sliding groove 201. By forming a connecting wall 211 and a protrusion 2221 on the shaft portion 21 and the second connecting seat 222 respectively, the connecting wall 211 is provided with a first slide groove 201, and the protrusion 2221 is located in the first slide groove 201 to form a limiting effect, so that the shaft portion 21 can stably extend and retract relative to the second connecting seat 222 along the length direction of the first slide groove 201, which provides convenience for the installation of printing paper and the shaft portion 21, and through the cooperation of the protrusion 2221 and the first slide groove 201, when the shaft portion 21 rotates, the protrusion 2221 abuts against the side wall of the first slide groove 201, thereby driving the second connecting seat 222 to rotate.

[0045] like Figures 4 to 6 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the connecting wall 211 encloses to form a first positioning groove 202, and the rotating shaft portion 21 or the second connecting seat 222 is movably inserted in the first positioning groove 202. The formation of the first positioning groove 202 can facilitate the positioning and assembly of the rotating shaft portion 21 and the second connecting seat 222, which is conducive to improving the installation efficiency.

[0046] like Figures 4 to 6As shown, in addition to the features of the above-mentioned embodiments, this embodiment further defines: there are multiple first slide grooves 201, multiple first slide grooves 201 are arranged at circumferential intervals along the first positioning groove 202, and the number of protrusions 2221 is consistent with the number of first slide grooves 201 and is arranged one-to-one.

[0047] like Figure 4 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the spring 23 is located in the first positioning groove 202 .

[0048] like Figure 7 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the projection 2221 is provided with a chamfer, so that when the projection 2221 is inserted into and leaves the first slide groove 201, the hard interference between the projection 2221 and the connecting wall 211 can be reduced to reduce damage to the projection 2221 or the connecting wall 211.

[0049] like Figure 3 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the machine body 1 is provided with a mounting groove 102 connected to the paper bin 101, the bearing portion 22 and / or the shaft portion 21 are arranged in the mounting groove 102, and one end of the shaft portion 21 away from the bearing portion 22 extends into the paper bin 101. By providing the mounting groove 102 on the machine body 1 for installing the paper shaft assembly 2, the positioning and assembly of the paper shaft assembly 2 can be facilitated, thereby facilitating the installation efficiency.

[0050] like Figure 2 and Figure 3 As shown, in addition to the features of the above-mentioned embodiments, this embodiment further defines that: when the bearing portion 22 and the shaft portion 21 are arranged in the mounting groove 102, the shaft portion 21 abuts against the outer side of the side wall of the paper bin 101, the bearing portion 22 abuts against the side wall of the mounting groove 102 away from the paper bin 101, and the side wall of the paper bin 101 is provided with a through hole 103 connected to the mounting groove 102, and one end of the shaft portion 21 away from the bearing portion 22 extends into the paper bin 101 through the through hole 103. By adopting the above structure, when the paper shaft assembly 2 is installed into the installation groove 102, the two ends of the paper shaft assembly 2 will be squeezed by the outer wall of the paper bin 101 and the side wall of the installation groove 102 respectively, so that the spring 23 is compressed until the shaft portion 21 is opposite to the through hole 103 on the side wall of the paper bin 101, and the squeezing of the shaft portion 21 is weakened. Under the action of the elastic restoring force of the spring 23, the shaft portion 21 quickly passes through the through hole 103 and is plugged into the through hole 103 to form a limiting effect, thereby realizing the rapid installation of the shaft assembly and preventing it from getting loose.

[0051] like Figure 3As shown, in addition to the features of the above embodiment, this embodiment further defines that: the installation groove 102 is formed by the bottom wall of the body 1 being recessed inwardly. This can achieve the hidden setting of the paper shaft assembly 2, avoid the paper shaft assembly 2 being exposed synchronously when the paper bin 101 is exposed, reduce the risk of the paper shaft assembly 2 being contaminated, and make the device more simple and beautiful.

[0052] like Figure 4 and Figure 6 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the rotation shaft portion 21 or the second connection seat 222 is formed with a positioning column 212, and the spring 23 is sleeved on the outside of the positioning column 212. By forming the positioning column 212 for plugging and matching with the spring 23, the positioning and installation of the spring 23 can be facilitated, so that the spring 23 can stably perform telescopic activities and is not easy to bend or separate from the rotation shaft portion 21 or the second connection seat 222.

[0053] like Figure 4 and Figure 7 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the shaft portion 21 or the second connection seat 222 is provided with a first receiving groove 203, and at least part of the spring 23 is inserted into the first receiving groove 203. The provision of the first receiving groove 203 facilitates the positioning and installation of the spring 23, so that the spring 23 is not easily separated from the shaft portion 21 or the second connection seat 222 when it is extended or retracted.

[0054] like Figure 4 , Figure 5 and Figure 8 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the first connection seat 221 and / or the second connection seat 222 is provided with a second positioning groove 204, and the rolling body 223 is rollingly arranged in the second positioning groove 204. The second positioning groove 204 can be arranged to position the rolling body 223, which can facilitate the assembly of the rolling body 223 with the first connection seat 221 and / or the second connection seat 222 to improve the installation efficiency. On the other hand, the second positioning groove 204 limits the rolling body 223, which can ensure that the rolling body 223 will not deviate when the bearing part 22 is working, and ensure the smooth rotation of the shaft part 21.

[0055] In addition to the features of the above-mentioned embodiment, the present embodiment further defines that: lubricating oil is provided in the bearing portion 22. When the second connection seat 222 rotates and the rolling body 223 rolls, the lubricating oil can further reduce the friction resistance and ensure smooth movement. In addition, the rolling body 223 can be adhered to the second connection seat 222 or the first connection seat 221 by the lubricating oil. The rolling body 223 can be temporarily arranged on the second connection seat 222 or the first connection seat 221 under the action of the viscous lubricating oil without falling, thereby facilitating the assembly of the bearing portion 22.

[0056] like Figure 4 and Figure 8 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the first connecting seat 221 is provided with a second accommodating groove 205, and the rolling body 223, the second connecting seat 222 and / or the rotating shaft portion 21 are movably arranged in the second accommodating groove 205. By arranging the second accommodating groove 205 on the first connecting seat 221, it is convenient to position and assemble the second connecting seat 222, and at the same time, it can form a protective effect on the rolling body 223, the second connecting seat 222 and / or the rotating shaft portion 21, so as to prevent foreign matter from invading the interior of the paper shaft assembly 2 and hindering the expansion and contraction of the rotating shaft portion 21, as well as the activities of the second connecting seat 222 and the rolling body 223.

[0057] like Figure 4 and Figure 5 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the rolling body 223 is at least one of a ball, a needle, a cylindrical roller and a tapered roller.

[0058] like Figure 3 and Figure 8 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the outer wall of the bearing portion 22 is formed with a connecting ear 2211, the connecting ear 2211 is provided with a first connecting hole 206, the body 1 is provided with a second connecting hole 104, and the first connecting hole 206 and the second connecting hole 104 are matched by fasteners to connect the bearing portion 22 and the body 1. By adopting the above structure, the first connecting hole 206 and the second connecting hole 104 can provide a stable connection between the bearing portion 22 and the body 1 through the fastener, which can ensure that the connected parts will not be easily separated when accidentally subjected to force.

[0059] like Figure 2 and Figure 4 As shown, in addition to the features of the above-mentioned embodiment, this embodiment further defines that: the end of the rotating shaft portion 21 away from the bearing portion 22 is spherical. By setting the connection end of the rotating shaft portion 21 and the printing paper shaft hole to be spherical, on the one hand, it can avoid hard interference between the printing paper roll and the rotating shaft portion 21 during paper changing operation, causing jamming or damage to the device or printing paper, and on the other hand, the spherical setting can better cooperate with printing paper rolls of different hole sizes for plug-in matching.

[0060] like Figure 2 and Figure 3 As shown, in addition to the features of the above embodiment, this embodiment further defines that: the number of paper shaft assemblies 2 is two, and the two paper shaft assemblies 2 are respectively located on opposite sides of the paper bin 101. By adopting the above structure, both sides of the printing paper can be supported by the paper shaft assemblies 2, the installation is more secure, and the two sets of paper shaft assemblies 2 can better cooperate with the rubber roller to pull and output the printing paper.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A printer, characterized in that: include: A machine body (1), wherein a paper bin (101) for accommodating printing paper is formed on the top of the machine body (1); A paper shaft assembly (2), the paper shaft assembly (2) comprising a rotating shaft portion (21) and a bearing portion (22), the rotating shaft portion (21) being rotatably connected to the machine body (1) via the bearing portion (22), at least a portion of the rotating shaft portion (21) being located in the paper bin (101), the rotating shaft portion (21) being used for plugging into an axis hole of a printing paper so as to suspend the printing paper in the paper bin (101); A rubber roller, the rubber roller being arranged on the machine body (1) and being used for pulling the printing paper in the paper bin (101) to be output outwards; A print head assembly is arranged on the machine body (1), and the print head assembly corresponds to the rubber roller.

2. The printer according to claim 1, characterized in that: The bearing portion (22) comprises a first connecting seat (221), a second connecting seat (222) and a rolling body (223); the first connecting seat (221) is arranged on the machine body (1); the second connecting seat (222) is coaxially arranged on the rotating shaft portion (21); an end of the second connecting seat (222) away from the rotating shaft portion (21) is connected to the first connecting seat (221) via the rolling body (223); and the second connecting seat (222) can rotate relative to the first connecting seat (221) when driven by the rotating shaft portion (21).

3. The printer according to claim 2, characterized in that: The paper shaft assembly (2) further comprises a spring (23), the two ends of which are respectively against the rotating shaft portion (21) and the second connecting seat (222), the rotating shaft portion (21) can be telescopic relative to the second connecting seat (222), and when the rotating shaft portion (21) approaches the second connecting seat (222), the spring (23) is compressed and generates elastic force.

4. The printer according to claim 3, characterized in that: One of the rotating shaft portion (21) and the second connecting seat (222) is formed with a connecting wall (211), and the connecting wall (211) is provided with a first sliding groove (201) along the axial direction of the rotating shaft portion (21); the other of the rotating shaft portion (21) and the second connecting seat (222) is formed with a protrusion (2221), and the protrusion (2221) is slidably inserted in the first sliding groove (201).

5. The printer according to claim 4, characterized in that: The connecting wall (211) encloses a first positioning groove (202), and the rotating shaft portion (21) or the second connecting seat (222) is movably inserted into the first positioning groove (202); and / or The protrusion (2221) is provided with a chamfer.

6. The printer according to claim 3, characterized in that: The machine body (1) is provided with a mounting groove (102) connected to the paper bin (101); the bearing portion (22) and / or the rotating shaft portion (21) are arranged in the mounting groove (102); and one end of the rotating shaft portion (21) away from the bearing portion (22) extends into the paper bin (101).

7. The printer according to claim 6, characterized in that: When the bearing portion (22) and the rotating shaft portion (21) are arranged in the mounting groove (102), the rotating shaft portion (21) abuts against the outer side of the side wall of the paper bin (101), the bearing portion (22) abuts against the side wall of the mounting groove (102) away from the paper bin (101), the side wall of the paper bin (101) is provided with a through hole (103) connected to the mounting groove (102), and one end of the rotating shaft portion (21) away from the bearing portion (22) extends into the paper bin (101) through the through hole (103); and / or The installation groove (102) is formed by the bottom wall of the machine body (1) being recessed inwardly.

8. The printer according to claim 3, characterized in that: The rotating shaft portion (21) or the second connecting seat (222) is formed with a positioning column (212), and the spring (23) is sleeved on the outside of the positioning column (212); and / or The rotating shaft portion (21) or the second connecting seat (222) is provided with a first accommodating groove (203), and at least a portion of the spring (23) is inserted into the first accommodating groove (203).

9. The printer according to claim 2, characterized in that: The first connecting seat (221) and / or the second connecting seat (222) is provided with a second positioning groove (204), and the rolling body (223) is rollingly arranged in the second positioning groove (204); and / or The first connecting seat (221) is provided with a second containing groove (205), and the rolling body (223), the second connecting seat (222) and / or the rotating shaft portion (21) are movably arranged in the second containing groove (205); and / or The rolling element (223) is at least one of a ball roller, a needle roller, a cylindrical roller and a tapered roller.

10. The printer according to any one of claims 1 to 9, characterized in that: The outer wall of the bearing portion (22) is formed with a connecting ear (2211), the connecting ear (2211) is provided with a first connecting hole (206), the machine body (1) is provided with a second connecting hole (104), the first connecting hole (206) and the second connecting hole (104) are matched to connect the bearing portion (22) and the machine body (1) via a fastener; and / or One end of the rotating shaft portion (21) away from the bearing portion (22) is spherical; and / or The number of the paper shaft assemblies (2) is two, and the two paper shaft assemblies (2) are respectively located on two opposite sides of the paper bin (101).

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