Printer

Abstract

The utility model discloses a printer, and relates to the technical field of printer equipment, the printer comprises a host, a cover body and a clamping hook assembly, the cover body can open and close the host by rotatably connecting the cover body with the host, the side, facing the host, of the cover body is provided with a printing roller, and the clamping hook assembly is arranged on the host. The clamping hook assembly comprises a clamping hook piece defining a clamping hook groove and a clamping hook part, the end face of the end, protruding into the clamping hook groove, of the clamping hook part is a transition face, the transition face comprises a first arc-shaped transition face, and when the cover body covers the main machine, the first arc-shaped transition face can make contact with the printing roller and can guide the printing roller to be clamped into the clamping hook groove. And the cover body is in contact with the printing roller through the first arc-shaped transition surface, so that the abrasion of the printing roller in the process of being clamped into the clamping hook groove can be reduced, and the service life of the printing roller can be prolonged.

Description

Technical Field

[0001] This application relates to the field of printer equipment technology, and more particularly to a printer. Background Technology

[0002] In related technologies, a printer includes a cover and a main unit, with the cover rotatably connected to the main unit. The cover has a rubber roller, and the main unit has a latching assembly. After the cover and main unit are closed, the rubber roller engages with the latching assembly to achieve the printing function. However, when the rubber roller engages with the latching assembly, it is easily worn down, leading to a reduced lifespan. Utility Model Content

[0003] This application provides a printer that solves the technical problem that the rubber roller is easily worn by the hook assembly, resulting in a reduced service life of the rubber roller.

[0004] In a first aspect, embodiments of this application provide a printer, which includes:

[0005] Host;

[0006] A cover body is rotatably connected to the main unit so that the cover body can open and close the main unit, and a printing roller is provided on the side of the cover body facing the main unit;

[0007] A hook assembly is disposed on the host computer. The hook assembly includes a hook member defining a hook groove and a hook portion. The hook portion is connected to the hook member. The end face of the hook portion protruding into the hook groove is a transition surface. The transition surface includes a first arc-shaped transition surface.

[0008] When the cover closes onto the host, the first arc-shaped transition surface is used to contact the printing roller and guide the printing roller into the hook groove.

[0009] In some embodiments, the transition surface further includes a planar transition surface and a second arcuate transition surface, wherein the first arcuate transition surface, the planar transition surface, and the second arcuate transition surface are connected in sequence;

[0010] When the cover closes onto the host, the printing roller sequentially engages with the hook groove along the first arc-shaped transition surface, the planar transition surface, and the second arc-shaped transition surface.

[0011] In some embodiments, the projection of the transition surface onto a first plane is a first line segment, the first plane being perpendicular to the width direction of the printer, and the length of the first line segment being a, where a satisfies: 0.3mm ≤ a ≤ 1.5mm.

[0012] In some embodiments, along the width direction of the printer, the hook portion includes a first side and a second side disposed opposite to each other, the transition surface is located between the first side and the second side, and the first side and the transition surface are connected by a first arc surface, and the second side and the transition surface are connected by a second arc surface.

[0013] In some embodiments, the hook portion is disposed at the opening of the hook groove, and the hook portion further includes a first guide surface, the first guide surface being located between the first side surface and the second side surface, and the first guide surface, the transition surface and the inner wall surface of the hook groove being connected in sequence.

[0014] When the cover closes onto the host, the first guide surface is used to guide the printing roller to contact the transition surface.

[0015] In some embodiments, the hook portion is disposed at the opening of the hook groove, and the hook portion further includes a second guide surface, the second guide surface being located between the first side surface and the second side surface, and the transition surface, the second guide surface and the inner wall surface of the hook groove are connected in sequence;

[0016] When the cover closes to the host, the printing roller moves along the transition surface to contact the second guide surface, and the second guide surface is used to guide the printing roller into the hook groove.

[0017] In some embodiments, the hook member is rotatably connected to the host, and the hook assembly further includes an ejector portion connected to the hook member. The ejector portion and the hook portion are spaced apart along the length direction of the printer, and a slot for the hook groove is provided between the ejector portion and the hook portion.

[0018] Specifically, by rotating the hook component, the ejector part is driven to abut against the printing roller, thereby ejecting the printing roller out of the hook groove.

[0019] In some embodiments, the ejector portion has an arcuate surface on the side facing the hook portion, and the arcuate surface and the transition surface have a slot for the hook groove, the arcuate surface being used to eject the printing roller out of the hook groove.

[0020] In some embodiments, the projection of the arcuate surface onto a first plane is a second line segment, the first plane being perpendicular to the width direction of the printer, and the length of the second line segment being b, where b satisfies: 0.2mm ≤ b ≤ 1mm.

[0021] In some embodiments, the cover has a connecting end and a movable end disposed opposite to each other. The connecting end is rotatably connected to the host, and the movable end is provided with the printing roller. The ejector part, the hook part, and the connecting end are arranged sequentially at intervals along the length direction of the printer.

[0022] In some embodiments, the hook assembly further includes a handle portion connected to the hook member, which drives the hook member to rotate.

[0023] In some embodiments, the hook is rotatably connected to the host via a pivot, so that the hook can rotate around the pivot. The distance between the pivot and the first arc-shaped transition surface is c, which satisfies: 10mm ≤ c ≤ 30mm.

[0024] In some embodiments, the printing roller includes a roller body and a mounting shaft, the mounting shaft is mounted on the cover, the roller body is rotatably sleeved on the mounting shaft, and when the cover is closed with the host, the end of the mounting shaft engages with the latch groove.

[0025] In some embodiments, the latch is rotatably connected to the host computer. Along the width direction of the printer, the latch has a first wall and a second wall that are arranged opposite to each other. The first wall is opposite to and spaced apart from the inner wall of the host computer. The distance between the first wall and the inner wall of the host computer is d, which satisfies: 0.1mm≤d≤0.5mm.

[0026] In some embodiments, the printer further includes a printhead connected to the hook assembly via an elastic element, the elastic element being in a compressed state, and the elastic force of the elastic element being m, where m satisfies: 3N≤m≤15N.

[0027] The printer based on the embodiments of this application has at least the following beneficial effects:

[0028] By rotating the cover to the main unit, the cover can be opened and closed. A printing roller is provided on the side of the cover facing the main unit, and a hook assembly is provided on the main unit. The hook assembly includes a hook member and a hook portion that define a hook groove. The end face of the hook portion that protrudes into the hook groove is a transition surface. The transition surface includes a first arc-shaped transition surface. When the cover is closed to the main unit, the first arc-shaped transition surface can contact the printing roller and guide the printing roller into the hook groove, so that the cover and the main unit are firmly closed. By contacting the printing roller with the first arc-shaped transition surface, the wear of the printing roller during the process of being locked into the hook groove can be reduced, thereby improving the service life of the printing roller. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A three-dimensional structural diagram of a printer provided for an embodiment of this application;

[0031] Figure 2 A three-dimensional structural diagram of the hook assembly provided in the embodiments of this application from a first perspective;

[0032] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0033] Figure 4 A three-dimensional structural diagram of the hook assembly provided in the embodiments of this application from a second perspective;

[0034] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0035] Figure 6 This is a schematic diagram of the printer mechanism structure provided in an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Printer; 10. Main unit; 20. Cover; 201. Connecting end; 202. Movable end; 30. Hook assembly; 301. Hook groove; 31. Hook component; 311. First wall surface; 312. Second wall surface; 32. Hook part; 321. First side surface; 322. Second side surface; 323. First guide surface; 324. Second guide surface; 33. Transition surface; 331. First arc-shaped transition surface; 332. Second arc-shaped transition surface; 333. Planar transition surface; 34. Ejector part; 341. Arc-shaped surface; 35. Handle part; 40. Printing roller; 41. Roller body; 42. Mounting shaft; 50. Print head; 60. Elastic element; 70. Back plate; 80. Front panel. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] Please see Figures 1 to 3This application provides a printer 100, which includes a host 10, a cover 20, and a hook assembly 30. The cover 20 is rotatably connected to the host 10 so that the cover 20 can open and close the host 10. A printing roller 40 is provided on the side of the cover 20 facing the host 10. The hook assembly 30 is disposed on the host 10. The hook assembly 30 includes a hook member 31 and a hook portion 32 that defines a hook groove 301. The hook portion 32 is connected to the hook member 31. The end face of the end of the hook portion 32 that protrudes into the hook groove 301 is a transition surface 33. The transition surface 33 includes a first arc-shaped transition surface 331. When the cover 20 is closed to the host 10, the first arc-shaped transition surface 331 is used to contact the printing roller 40 and guide the printing roller 40 into the hook groove 301.

[0040] Optionally, the cover 20 includes a connecting end 201 and a movable end 202, which are the two opposite ends of the cover 20. The connecting end 201 of the cover 20 can be rotatably connected to the host 10 via a rotating shaft, so that the cover 20 can rotate relative to the host 10 about the axis of the rotating shaft. The movable end 202 of the cover 20 is provided with a printing roller 40. The host 10 has a paper tray, and the printing paper roll can be placed in the paper tray.

[0041] When it is necessary to place the printing paper roll into the paper tray, the movable end 202 of the cover 20 can be rotated away from the host 10 to open the paper tray, at which point the printing paper roll can be placed into the paper tray. When printing is required, the movable end 202 of the cover 20 can be rotated towards the host 10 to close the paper tray, and the printing roller 40 can press the printing paper to ensure that the printing paper and the print head 50 of the printer 100 maintain a constant distance and prevent the printing paper from shifting.

[0042] The latch assembly 30 can be mounted on the main unit 10 and is disposed adjacent to the paper tray. The latch assembly 30 includes two latch members 31 and two latch portions 32. The two latch members 31 are spaced apart along the width direction of the printer 100. Figure 1 The X-axis direction is the width direction of the printer 100. The two hook parts 32 are respectively connected to the two hook pieces 31, and the hook pieces 31 and hook parts 32 connected to each other define the hook groove 301. Thus, the two hook grooves 301 can be spaced apart along the width direction of the printer 100. The end face of the end of the hook part 32 that protrudes into the corresponding hook groove 301 is a transition surface 33. The transition surface 33 includes a first arc-shaped transition surface 331, so that both hook grooves 301 have a first arc-shaped transition surface 331.

[0043] When the cover 20 closes onto the host 10, the two opposite ends of the printing roller 40 along the width direction of the printer 100 respectively contact the two first arc-shaped transition surfaces 331, and the two first arc-shaped transition surfaces 331 can respectively guide the opposite ends of the printing roller 40 into the two hook grooves 301, so that the cover 20 and the host 10 are firmly closed, and the printing roller 40 can keep pressing the printing paper to prevent the printing paper from shifting during the printing process. Through the contact between the first arc-shaped transition surfaces 331 and the printing roller 40, the wear of the printing roller 40 during the process of being inserted into the hook grooves 301 can be reduced, thereby improving the service life of the printing roller 40.

[0044] Please see Figure 3 In some embodiments, the transition surface 33 further includes a planar transition surface 333 and a second arc-shaped transition surface 332. The first arc-shaped transition surface 331, the planar transition surface 333 and the second arc-shaped transition surface 332 are connected in sequence. When the cover 20 closes to the host 10, the printing roller 40 is sequentially inserted into the hook groove 301 along the first arc-shaped transition surface 331, the planar transition surface 333 and the second arc-shaped transition surface 332.

[0045] Optionally, with the depth direction of the paper tray as the vertical direction, the first arc-shaped transition surface 331 is located above the planar transition surface 333, and the planar transition surface 333 is located above the second arc-shaped transition surface 332. The first arc-shaped transition surface 331, the planar transition surface 333, and the second arc-shaped transition surface 332 are sequentially connected. When the cover 20 closes to the host 10, the printing roller 40 can first contact the first arc-shaped transition surface 331, and guided by the first arc-shaped transition surface 331, the printing roller 40 moves to... The flat transition surface 333 contacts the printing roller 40, and after passing through the flat transition surface 333, it contacts the second arc-shaped transition surface 332. Guided by the second arc-shaped transition surface 332, the printing roller 40 is inserted into the hook groove 301. The flat transition surface 333 is located between the first arc-shaped transition surface 331 and the second arc-shaped transition surface 332, so that the printing roller 40 can transition more smoothly during the process of moving from the first arc-shaped transition surface 331 to the second arc-shaped transition surface 332, which can further reduce the wear of the printing roller 40.

[0046] In some embodiments, the projection of the transition surface 33 onto the first plane is a first line segment, the first plane is perpendicular to the width direction of the printer 100, and the length of the first line segment is a, where a satisfies: 0.3mm≤a≤1.5mm.

[0047] Optionally, the first plane is perpendicular to the width direction of the printer 100, so the projection of the printer 100 onto the first plane is a side view of the printer 100, and the projection of the transition surface 33 onto the first plane is a first line segment. The first line segment can be regarded as the movement path of the printing roller 40 into the latching groove 301. If a is greater than 1.5mm, the travel of the printing roller 40 into the latching groove 301 will be too long, which will increase the difficulty of the printing roller 40 into the latching groove 301, making it inconvenient for the cover 20 to close. If a is less than 0.3mm, since at least part of the first line segment is an arc, the transition surface 33 will have a relatively sharp part, and the process of the printing roller 40 into the latching groove 301 will be easily worn. Therefore, when a satisfies: 0.3mm≤a≤1.5mm, it will not increase the difficulty of the printing roller 40 into the latching groove 301, and it can also reduce the wear on the printing roller 40.

[0048] Please see Figure 2 and Figure 3 In some embodiments, along the width direction of the printer 100, the hook portion 32 includes a first side surface 321 and a second side surface 322 disposed opposite to each other, a transition surface 33 is located between the first side surface 321 and the second side surface 322, and the first side surface 321 and the transition surface 33 are connected by a first arc surface, and the second side surface 322 and the transition surface 33 are connected by a second arc surface.

[0049] Optionally, the overall shape of the hook portion 32 can be plate-shaped, and the hook portion 32 includes a first side surface 321 and a second side surface 322 arranged opposite to each other along the width direction of the printer 100. The transition surface 33 is located between the first side surface 321 and the second side surface 322. The first side surface 321 and the transition surface 33 are connected by a first arc surface, and the second side surface 322 and the transition surface 33 are connected by a second arc surface, so that the two opposite sides of the transition surface 33 along the width direction of the printer 100 can have arc surface transitions. Thus, when the printing roller 40 is inserted into the hook groove 301 along the transition surface 33, the wear of the printing roller 40 can be further reduced.

[0050] Please see Figure 2 and Figure 3 In some embodiments, the hook portion 32 is disposed at the opening of the hook groove 301, and the hook portion 32 also includes a first guide surface 323. The first guide surface 323 is located between the first side surface 321 and the second side surface 322, and the first guide surface 323, the transition surface 33 and the inner wall surface of the hook groove 301 are connected in sequence. When the cover 20 closes to the host 10, the first guide surface 323 is used to guide the printing roller 40 to contact the transition surface 33.

[0051] Optionally, the hook portion 32 is disposed at the opening of the hook groove 301, so that when the cover 20 closes to the host 10, the printing roller 40 first contacts the hook portion 32. The hook portion 32 also includes a first guide surface 323. Along the vertical direction, the first guide surface 323 is located above the transition surface 33. The first guide surface 323, the transition surface 33 and the inner wall surface of the hook groove 301 are connected in sequence. The first guide surface 323 is an inclined surface. The side of the first guide surface 323 connected to the transition surface 33 is closer to the bottom of the hook groove 301 than the other side of the first guide surface 323.

[0052] When the cover 20 closes to the host 10, the printing roller 40 first contacts the first guide surface 323, and under the guidance of the first guide surface 323, the printing roller 40 can gradually move towards the hook groove 301 until it contacts the transition surface 33. Thus, under the guidance of the transition surface 33, the printing roller 40 can move to contact the inner wall surface of the hook groove 301, thereby allowing the printing roller 40 to be inserted into the hook groove 301. By setting the first guide surface 323, the printing roller 40 can be guided to contact the transition surface 33 smoothly.

[0053] Please see Figure 2 and Figure 3 In some embodiments, the hook portion 32 is disposed at the opening of the hook groove 301, and the hook portion 32 also includes a second guide surface 324. The second guide surface 324 is located between the first side surface 321 and the second side surface 322, and the transition surface 33, the second guide surface 324 and the inner wall surface of the hook groove 301 are connected in sequence. When the cover 20 closes to the host 10, the printing roller 40 moves along the transition surface 33 to contact the second guide surface 324, and the second guide surface 324 is used to guide the printing roller 40 to be inserted into the hook groove 301.

[0054] Optionally, the hook portion 32 further includes a second guide surface 324. Along the width direction of the printer 100, the second guide surface 324 is located between the first side surface 321 and the second side surface 322. Along the vertical direction, the second guide surface 324 is located between the transition surface 33 and the inner wall surface of the hook groove 301. The second guide surface 324 is located below the transition surface 33, and the transition surface 33, the second guide surface 324, and the inner wall surface of the hook groove 301 are connected in sequence. The second guide surface 324 is an inclined surface, and the side of the second guide surface 324 that connects to the transition surface 33 is further away from the bottom of the hook groove 301 than the other side of the second guide surface 324.

[0055] When the cover 20 closes to the host 10, the printing roller 40 moves along the transition surface 33 to contact the second guide surface 324. Guided by the second guide surface 324, the printing roller 40 can move to contact the inner wall of the hook groove 301, thereby allowing the printing roller 40 to be engaged in the hook groove 301. By setting the second guide surface 324, the printing roller 40 can be easily engaged in the hook groove 301. After the printing roller 40 is engaged in the hook groove 301, the second guide surface 324 can prevent the printing roller 40 from disengaging from the hook groove 301, so that the printing roller 40 can be more stably engaged in the hook groove 301.

[0056] Please see Figure 1 and Figure 4 In some embodiments, the hook member 31 is rotatably connected to the host 10. The hook assembly 30 also includes an ejector part 34 connected to the hook member 31. The ejector part 34 and the hook part 32 are spaced apart along the length direction of the printer 100. There is a slot 301 between the ejector part 34 and the hook part 32. By rotating the hook member 31, the ejector part 34 is driven to abut against the printing roller 40, so as to eject the printing roller 40 out of the hook slot 301.

[0057] Optionally, the latch 31 is rotatably connected to the host 10 via a rotating shaft, allowing the latch 31 to rotate about the axis of the rotating shaft. This also allows the user to manually rotate the latch 31. The ejector portion 34 can be spaced apart from the latch portion 32 along the length of the printer 100. Figure 1 The Y-axis direction is the length direction of the printer 100, and there is a slot 301 between the ejector part 34 and the hook part 32. After the end of the printing roller 40 is engaged in the hook groove 301, the hook part 32 can abut against the end of the printing roller 40 to lock the end of the printing roller 40 in the hook groove 301.

[0058] When it is necessary to release the printing roller 40, the hook 31 can be rotated to move the ejector 34 toward the printing roller 40, so that the end face of the ejector 34 facing the hook 32 contacts the printing roller 40. Thus, the ejector 34 can push the printing roller 40. At the same time, the hook 31 will also move the hook 32 away from the printing roller 40, so that the hook 32 can move away from the direction in which the ejector 34 pushes the printing roller 40. Under the continuous pushing force of the ejector 34, the printing roller 40 is completely disengaged from the hook groove 301. The user can easily release the printing roller 40 and open the cover 20.

[0059] Please see Figure 1 , Figure 4 and Figure 5In some embodiments, the ejector portion 34 has an arcuate surface 341 on the side facing the hook portion 32, and a slot of hook groove 301 is provided between the arcuate surface 341 and the transition surface 33. The arcuate surface 341 is used to eject the printing roller 40 out of the hook groove 301.

[0060] Optionally, the ejector portion 34 protrudes toward the hook portion 32 along the length direction of the printer 100, and the ejector portion 34 has an arc-shaped surface 341 on the side facing the hook portion 32. The arc-shaped surface 341 and the transition surface 33 have a groove of hook groove 301. When the hook member 31 is rotated to make the ejector portion 34 eject the printing roller 40 out of the hook groove 301, the arc-shaped surface 341 contacts the printing roller 40, making the contact surface between the ejector portion 34 and the printing roller 40 smoother, which can further reduce the wear of the printing roller 40.

[0061] In some embodiments, the projection of the arcuate surface 341 onto the first plane is a second line segment. The first plane is perpendicular to the width direction of the printer 100, and the length direction of the second line segment is b, where b satisfies: 0.2mm≤b≤1mm.

[0062] Optionally, when the ejector 34 ejects the printing roller 40 out of the latch groove 301, the second line segment is the relative movement path between the ejector 34 and the printing roller 40. If b is greater than 1mm, the travel distance of the printing roller 40 from the latch groove 301 will be too long, which will increase the difficulty of the printing roller 40 from the latch groove 301, making it inconvenient to release the printing roller 40 and increasing the difficulty of opening the cover 20. If b is less than 0.2mm, since the second line segment is an arc, the second line segment with too short a length will cause the arc surface 341 to be very sharp, and the printing roller 40 will be easily worn during the process of detaching from the latch groove 301. Therefore, when b satisfies: 0.2mm≤b≤1mm, it will not increase the difficulty of the printing roller 40 from the latch groove 301, and it can also reduce the wear on the printing roller 40.

[0063] Please see Figure 1 In some embodiments, the cover 20 has a connecting end 201 and a movable end 202 that are disposed opposite to each other. The connecting end 201 is rotatably connected to the host 10, and the movable end 202 is provided with a printing roller 40. The ejector part 34, the hook part 32 and the connecting end 201 are arranged sequentially at intervals along the length direction of the printer 100.

[0064] Optionally, the connecting end 201 of the cover 20 can be rotatably connected to the host 10 via a pivot. Since the ejector portion 34 is closer to the connecting end 201 of the cover 20 than the latch portion 32 along the length of the printer 100, and along the height of the printer 100… Figure 1The Z-axis direction is the height direction of the printer 100. The highest point of the hook part 32 is higher than the highest point of the ejector part 34. Therefore, when the cover 20 closes to the host 10, the movable end 202 gradually approaches the hook part 31, and the printing roller 40 on the movable end 202 first contacts the hook part 32. Under the guidance of the transition surface 33, the end of the printing roller 40 gradually gets into the hook groove 301 to lock the cover 20 and the host 10. When it is necessary to open the cover 20, the hook part 31 can be rotated to drive the ejector part 34 to contact the end of the printing roller 40 first. The arc surface 341 of the ejector part 34 can push the printing roller 40 out of the hook groove 301, so that the cover 20 and the host 10 are disengaged from the locked state, and the printer 100 can be opened and closed very conveniently.

[0065] Please see Figure 1 and Figure 2 In some embodiments, the hook assembly 30 further includes a handle portion 35, which is connected to the hook member 31 and drives the hook member 31 to rotate through the handle portion 35.

[0066] Optionally, the handle portion 35 is integrally formed with the hook member 31, and the handle portion 35 is located below the hook member 31. The handle portion 35 also extends away from the hook member 31 to increase the distance between the free end of the handle portion 35 and the hook member 31, thereby increasing the lever arm of the force applied to the handle portion 35. This allows the handle portion 35 to be easily turned to rotate the hook member 31, and the printing roller 40 can be released with less effort.

[0067] In some embodiments, the hook 31 is rotatably connected to the host 10 via a rotating shaft, so that the hook 31 can rotate around the rotating shaft. The distance between the axis of the rotating shaft and the first arc-shaped transition surface 331 along the direction perpendicular to the axis of the rotating shaft is c, where c satisfies: 10mm≤c≤30mm.

[0068] It is understandable that the hook 31 can rotate with the host 10 via the pivot. When the cover 20 closes to the host 10, the printing roller 40 will gradually approach the hook 32 until it contacts the first arc-shaped transition surface 331 of the hook 32. The printing roller 40 will push the hook 32 to drive the hook 31 to rotate, so that the end of the printing roller 40 can be engaged in the hook groove 301. When the hook 31 rotates around the axis of the pivot, the distance c between the axis of the pivot and the first arc-shaped transition surface 331 in the direction perpendicular to the axis of the pivot is the lever arm of the printing roller 40 pushing the hook 31 to rotate.

[0069] If c is less than 10mm, the lever arm for the printing roller 40 to rotate the latch 31 is too small. Therefore, to engage the printing roller 40 in the latch groove 301, the user needs to apply greater force to rotate the cover 20 towards the host 10. This increases the friction between the printing roller 40 and the latch 31, making the printing roller 40 more prone to wear. If c is greater than 30mm, the overall size of the latch 31 will increase, increasing the volume of the printer 100. Therefore, when c satisfies 10mm ≤ c ≤ 30mm, the cover 20 can be easily closed, reducing wear on the printing roller 40 without increasing the volume of the printer 100.

[0070] Please see Figure 1 In some embodiments, the printing roller 40 includes a roller body 41 and a mounting shaft 42. The mounting shaft 42 is mounted on the cover 20, the roller body 41 is rotatably sleeved on the mounting shaft 42, and when the cover 20 is closed with the host 10, the end of the mounting shaft 42 engages with the hook groove 301.

[0071] Optionally, the mounting shaft 42 is fixed to the movable end 202 of the cover 20. The axial direction of the mounting shaft 42 is the same as the width direction of the cover 20 and is perpendicular to the cover 20. There is sufficient gap between the mounting shaft 42 and the cover 20 so that after the roller 41 is movably sleeved on the mounting shaft 42, the roller 41 can rotate around the axial direction of the mounting shaft 42.

[0072] When the cover 20 closes onto the main unit 10, the end of the mounting shaft 42 contacts the transition surface 33 of the hook portion 32, and the end of the mounting shaft 42 is guided by the transition surface 33 to engage in the hook groove 301 to lock the cover 20 and the main unit 10. Since the mounting shaft 42 is fixed to the cover 20, the mounting shaft 42 will not rotate during the engagement of the hook groove 301, which can further reduce the wear of the mounting shaft 42.

[0073] It should be noted that if the roller body 41 is fixedly connected to the mounting shaft 42, the mounting shaft 42 needs to be able to rotate relative to the cover 20 so that the roller body 41 can rotate. This causes the mounting shaft 42 to rotate relative to the hook part 32 during the process of engaging the hook groove 301, which will increase the wear of the mounting shaft 42 and the hook part 32 and reduce the service life of the printing roller 40.

[0074] Please see Figure 1 and Figure 4In some embodiments, the hook member 31 is rotatably connected to the host 10. Along the width direction of the printer 100, the hook member 31 has a first wall surface 311 and a second wall surface 312 arranged opposite to each other. The first wall surface 311 is opposite to and spaced apart from the inner side wall of the host 10. The distance between the first wall surface 311 and the inner side wall of the host 10 is d, which satisfies: 0.1mm≤d≤0.5mm.

[0075] Optionally, the hook 31 can be rotatably connected to the host 10 via a rotating shaft, allowing the hook 31 to rotate relative to the host 10. When the distance d is less than 0.1mm, the gap between the hook 31 and the host 10 is too small. When the hook 31 rotates relative to the host 10, the first sidewall may rub against the inner sidewall of the host 10, increasing the difficulty of rotating the hook 31. Consequently, when the printing roller 40 is engaged in the hook groove 301, a greater force is required to engage it, increasing the wear of the printing roller 40. When the distance d is greater than 0.5mm, the gap between the hook 31 and the host 10 is too large, leading to an increase in the size of the printer 100. Therefore, when d satisfies: 0.1mm≤d≤0.5mm, the hook 31 can be easily rotated, reducing the difficulty of engaging the printing roller 40 in the hook groove 301, reducing the wear on the printing roller 40, and without increasing the size of the printer 100.

[0076] Please see Figure 1 and Figure 6 In some embodiments, the printer 100 further includes a print head 50, which is connected to the hook assembly 30 via an elastic member 60. The elastic member 60 is in a compressed state, and the elastic force provided by the elastic member 60 is m, where m satisfies: 3N≤m≤15N.

[0077] Optionally, the hook assembly 30 can be connected to the back plate 70, and the print head 50 can be disposed on the front panel 80. The back plate 70 and the front panel 80 are disposed opposite each other, and the elastic member 60 is compressed between the back plate 70 and the front panel 80. The print head 50 is located on the side of the front panel 80 facing away from the back plate 70. The print head 50 can be a heated print head 50. When the printer 100 is printing, the heated print head 50 can come into contact with the ribbon, so that the heat generated by the heated print head 50 can be transferred to the ribbon. After the toner on the ribbon is heated and melted, it adheres to the surface of the printing paper under pressure, thereby realizing printing.

[0078] The elastic force that the elastic element 60 can provide is m. If m > 15N, the elastic force of the elastic element 60 acting on the back plate 70 is too large, which makes it difficult for the hook 31 to rotate. When the cover 20 closes to the host 10, the printing roller 40 needs more force to be inserted into the hook groove 301, which will increase the wear of the printing roller 40. If m < 3N, the elastic force provided by the elastic element 60 to the panel 80 is too small, which will make it impossible for the print head 50 to press against the printing roller 40. As a result, the print head 50 and the printing roller 40 cannot stably hold the printing paper, and the printing effect will be worse.

[0079] Therefore, when m satisfies 3N≤m≤15N, the elastic element 60 can provide a continuous preload force to the print head 50, ensuring that the print head 50 can abut against the print roller 40 to stably clamp the printing paper and ribbon together, thereby maintaining a high-quality printing effect without increasing the difficulty of the print roller 40 getting stuck in the hook groove 301.

[0080] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application 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, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0081] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A printer, characterized in that, include: Host; A cover body is rotatably connected to the main unit so that the cover body can open and close the main unit, and a printing roller is provided on the side of the cover body facing the main unit; A hook assembly is disposed on the host computer. The hook assembly includes a hook member defining a hook groove and a hook portion. The hook portion is connected to the hook member. The end face of the hook portion protruding into the hook groove is a transition surface. The transition surface includes a first arc-shaped transition surface. When the cover closes onto the host, the first arc-shaped transition surface is used to contact the printing roller and guide the printing roller into the hook groove.

2. The printer according to claim 1, characterized in that, The transition surface further includes a planar transition surface and a second arc-shaped transition surface, wherein the first arc-shaped transition surface, the planar transition surface, and the second arc-shaped transition surface are connected in sequence; When the cover closes onto the host, the printing roller sequentially engages with the hook groove along the first arc-shaped transition surface, the planar transition surface, and the second arc-shaped transition surface.

3. The printer according to claim 1, characterized in that, The projection of the transition surface onto the first plane is a first line segment. The first plane is perpendicular to the width direction of the printer. The length of the first line segment is a, where a satisfies: 0.3mm ≤ a ≤ 1.5mm.

4. The printer according to claim 1, characterized in that, Along the width direction of the printer, the hook portion includes a first side and a second side disposed opposite to each other, the transition surface is located between the first side and the second side, and the first side and the transition surface are connected by a first arc surface, and the second side and the transition surface are connected by a second arc surface.

5. The printer according to claim 4, characterized in that, The hook portion is disposed at the opening of the hook groove, and the hook portion further includes a first guide surface, which is located between the first side surface and the second side surface, and the first guide surface, the transition surface and the inner wall surface of the hook groove are connected in sequence. When the cover closes onto the host, the first guide surface is used to guide the printing roller to contact the transition surface.

6. The printer according to claim 4, characterized in that, The hook portion is disposed at the opening of the hook groove, and the hook portion further includes a second guide surface, the second guide surface is located between the first side surface and the second side surface, and the transition surface, the second guide surface and the inner wall surface of the hook groove are connected in sequence; When the cover closes to the host, the printing roller moves along the transition surface to contact the second guide surface, and the second guide surface is used to guide the printing roller into the hook groove.

7. The printer according to claim 1, characterized in that, The hook component is rotatably connected to the host computer. The hook assembly also includes an ejector portion connected to the hook component. The ejector portion and the hook portion are spaced apart along the length direction of the printer. The ejector portion and the hook portion have a slot for the hook groove. Specifically, by rotating the hook component, the ejector part is driven to abut against the printing roller, thereby ejecting the printing roller out of the hook groove.

8. The printer according to claim 7, characterized in that, The ejector portion has an arc-shaped surface on the side facing the hook portion, and the arc-shaped surface and the transition surface have a slot for the hook groove. The arc-shaped surface is used to eject the printing roller out of the hook groove.

9. The printer according to claim 8, characterized in that, The projection of the arc-shaped surface onto the first plane is a second line segment. The first plane is perpendicular to the width direction of the printer. The length of the second line segment is b, which satisfies: 0.2mm≤b≤1mm.

10. The printer according to claim 7, characterized in that, The cover has a connecting end and a movable end that are arranged opposite to each other. The connecting end is rotatably connected to the main unit, and the movable end is provided with the printing roller. The ejector part, the hook part, and the connecting end are arranged sequentially at intervals along the length of the printer.

11. The printer according to claim 7, characterized in that, The hook assembly also includes a handle portion, which is connected to the hook component and drives the hook component to rotate through the handle portion.

12. The printer according to claim 1, characterized in that, The hook is rotatably connected to the host via a rotating shaft, so that the hook can rotate around the rotating shaft. The distance between the rotating shaft's centerline and the first arc-shaped transition surface is c, which satisfies: 10mm ≤ c ≤ 30mm.

13. The printer according to claim 1, characterized in that, The printing roller includes a roller body and a mounting shaft. The mounting shaft is mounted on the cover. The roller body is rotatably sleeved on the mounting shaft. When the cover is closed with the host, the end of the mounting shaft engages with the latch groove.

14. The printer according to claim 1, characterized in that, The hook is rotatably connected to the host. Along the width direction of the printer, the hook has a first wall and a second wall that are arranged opposite to each other. The first wall is opposite to and spaced apart from the inner wall of the host. The distance between the first wall and the inner wall of the host is d, which satisfies: 0.1mm≤d≤0.5mm.

15. The printer according to claim 1, characterized in that, The printer also includes a print head, which is connected to the hook assembly via an elastic element. The elastic element is in a compressed state, and the elastic force of the elastic element is m, where m satisfies: 3N≤m≤15N.

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