Printing device

Abstract

The present application provides a printing device, which comprises a housing, a cover body rotatably connected to the housing around a plurality of cover body rotating shafts defining a first axis line, the plurality of cover body rotating shafts being located inside the housing and close to the right wall of the housing, and a printer core comprising a lower support fixedly arranged in the housing, an upper support rotatably connected to the lower support around a support rotating shaft defining a second axis line, a rubber roller and a print head, one of the rubber roller and the print head being arranged on the lower support and the other being arranged on the upper support; the upper support is movably carried by the cover body, the first axis line and the projection of the axis line of the rubber roller in the vertical direction are perpendicular to each other; the support rotating shaft is close to the right wall of the housing, the second axis line is parallel to the first axis line and located on the upper side of the first axis line.

Description

TECHNICAL FIELD

[0001] The present application relates to a printing device. BACKGROUND

[0002] There is a kind of printer with a cover opening structure, which comprises a casing defining a paper winding cavity, a cover body openable relative to the casing, and a printer core. A pivot mechanism for opening and closing the cover body and the casing is arranged inside the casing, and the cover body is connected to the pivot mechanism through a cover body support. The printer forms a winding path for the movement of the paper and a paper outlet at the end of the winding path for the paper to exit the printer, and at least part of the paper outlet is formed on the casing. The printer core is located on the winding path and close to the paper outlet to print the information desired by the user on the paper. The above-mentioned printer, under the premise of ensuring the basic function (such as the opening angle of the cover, which is generally required to be not less than ninety degrees to facilitate the user to put in the paper), the smaller the volume means the higher the portability and space utilization. Therefore, how to reduce the overall volume of the printer without affecting the basic function of the printer has become a technical problem that needs to be solved by those skilled in the art.

[0003] Japanese Utility Model Patent No. JP3210425U discloses a printer core, which comprises a lower support, an upper support rotatably supported on the lower support about a second rotation axis, a rubber roller, a print head, and a locking member for locking the upper support to the lower support. One of the rubber roller and the print head is arranged on the lower support, and the other is arranged on the upper support and can be carried and moved by the upper support. The projection of the second rotation axis and the axis of the rubber roller in the vertical direction is perpendicular to each other. When the printer core is arranged in the printer, a flexible circuit board can enter the upper support from one end of the upper support close to the second rotation axis to supply power to each electric component on the upper support. The flexible circuit board does not need to be buried in the casing of the printer, thereby greatly reducing the complexity of the wiring of the printer, facilitating the maintenance of the printer and reducing the failure rate of the printer. However, there is no small printing device with a side opening cover using the above-mentioned printer core. SUMMARY

[0004] The purpose of the present application is to provide a printing device that is easy to miniaturize.

[0005] The applicant found that the more the rotation axis of the cover body moves downward, the smaller the required reserved gap between the cover body and the casing can be set, which is more conducive to the miniaturization of the printing device. However, when the printer core as described in the cited document is applied to a printing device with a side opening cover, the more the support of the printer core rotates downward, the thicker the cover body will be, which is not conducive to the miniaturization of the printing device.

[0006] In order to achieve the purpose of miniaturization of the printing device, the present application provides the following technical solutions: a printing device, characterized in that comprising: a shell; a cover body rotatably connected to the shell around a plurality of cover body rotation shafts defining a first axis line, the plurality of cover body rotation shafts being located inside the shell and close to the right wall of the shell; and a printer core comprising a lower support fixedly arranged in the shell, an upper support rotatably connected to the lower support around a support rotation shaft defining a second axis line, a rubber roller and a print head, one of the rubber roller and the print head being arranged on the lower support and the other being arranged on the upper support; the upper support can be carried and moved by the cover body, the first axis line and the projection of the axis line of the rubber roller in the vertical direction are perpendicular to each other; the support rotation shaft is close to the right wall of the shell, and the second axis line is parallel to the first axis line and located on the upper side of the first axis line.

[0007] In the above technical solution, preferably, the front wall of the shell is provided with a paper outlet, when the cover body is in the closed state, a paper outlet gap is defined between the upper support and the lower support, and the projection of the paper outlet gap in the front-rear direction falls within the range of the projection of the paper outlet in the front-rear direction. It can be further preferred that the paper outlet extends downward from the upper edge of the front wall of the shell.

[0008] In the above technical solution, preferably, the printing device further comprises an open cover torsional spring, the cover body or the shell is further provided with a torsional spring shaft defining a third axis line and being capable of being installed in an open cover torsional manner, the torsional spring shaft is located inside the shell, the third axis line is parallel to the first axis line, and when the cover body is in the closed state, the first axis line is closer to the right wall of the shell than the third axis line.

[0009] In the above technical solution, preferably, the cover body comprises a plurality of cover body legs, each of the cover body legs comprises a first part extending outward from the cover body inner wall in a direction perpendicular to the cover body inner wall and a second part connected to the first part at an angle of 80°-100°, and the second part is rotatably connected to the shell via the cover body rotation shaft at the side end away from the first part. It can be further preferred that when the cover body is in the closed state, from the front-rear direction, the first axis line and the upper boundary of the shell have a first distance in the vertical direction, and the first axis line and the first part have a second distance in the horizontal direction, and the second distance is not less than the first distance.

[0010] In the above technical solution, preferably, the upper support defines a moving space, the cover includes a first cover opening hook capable of pulling the upper support, at least part of the wall surface of the moving space is located on the moving track of the first cover opening hook, and the first cover opening hook is spaced apart from the wall surface of the moving space in the left-right direction when the cover is in the closed state. It can be further preferred that the first cover opening hook is spaced apart from the top wall of the moving space in the vertical direction when the cover is in the closed state, the cover has a first rotation angle of rotation relative to the shell, and the first cover opening hook contacts the upper support when the cover is at the first rotation angle to allow the cover to move the upper support. It can be further preferred that the printer core further includes a locking member, the locking member has a locking position for locking the upper support to the lower support and an unlocking position for allowing the upper support to rotate relative to the lower support, the cover further includes a second cover opening hook and has a second rotation angle of rotation not greater than the first rotation angle, at least part of the locking member is located on the moving path of the second cover opening hook, and the locking member is pushed to the unlocking position by the second cover opening hook when the cover is at the first rotation angle. It can be further preferred that the locking member is a hook lock, the lower support is provided with a cross bar extending along the direction of the first rotation axis and matched with the hook lock; from the direction of the first rotation axis, the contact position of the hook lock and the cross bar is located on the side close to the first rotation axis of the vertical line passing through the cross bar when the cover is in the closed state; the cover has a first side wall away from the first rotation axis, the shell has a second side wall away from the first rotation axis; the first side wall and the second side wall have a second spacing in the vertical direction when the cover is in the closed state, the second side wall has a second length in the horizontal direction perpendicular to the first rotation axis, the push bracket position has a first length in the horizontal direction perpendicular to the first rotation axis, and the ratio of the first spacing to the first length is smaller than the ratio of the second spacing to the second length.

[0011] In the above technical solution, preferably, from the front-rear direction, the first axis center line and the second axis center line have a difference value formed by the length of the connecting line of the two and the distance of the two in the left-right direction, and the gap between the first cover opening hook and the wall surface of the moving space in the left-right direction is not less than the difference value when the cover is in the closed state.

[0012] The printing device provided by the technical scheme discards the conventional design idea of integrating the cover support and the core support into one body, splits the support rotating shaft and the cover rotating shaft, and makes the support rotating shaft be located on the upside of the cover rotating shaft, so that the technical effect of miniaturization is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a perspective view of the printer in the open cover state according to the preferred embodiment of the present application;

[0014] Figure 2 is a perspective exploded view of the printer according to the preferred embodiment of the present application;

[0015] Figure 3 is a sectional view of the printer in the closed cover state according to the preferred embodiment of the present application, showing the relative positions of the first, second and third axis center lines;

[0016] Figure 4 is a sectional view of the printer in the closed cover state according to the preferred embodiment of the present application, showing the cover support leg;

[0017] Figure 5 is a partial sectional view of the printer according to the preferred embodiment of the present application, in which the cover is at a first rotating angle;

[0018] Figure 6 is a partial sectional view of the printer according to the preferred embodiment of the present application, in which the cover is at a second rotating angle;

[0019] Figure 7 is a schematic diagram of the shell and the cover of the printer according to the preferred embodiment of the present application;

[0020] Figure 8 is a schematic diagram of the influence of the first axis center line at different heights on the required reserved gap between the cover and the shell of the printer according to the preferred embodiment of the present application Figure 1 ;

[0021] Figure 9 is a schematic diagram of the influence of the first axis center line at different heights on the required reserved gap between the cover and the shell of the printer according to the preferred embodiment of the present application Figure 2 ;

[0022] Figure 10 is a schematic diagram of the influence of the first axis center line at different horizontal positions on the required reserved gap between the cover and the shell of the printer according to the preferred embodiment of the present application;

[0023] Figure 11 is a structural diagram of the printing device according to the preferred embodiment of the present application. DETAILED DESCRIPTION

[0024] The present application is further illustrated in the following description with reference to the accompanying drawings and specific embodiments.

[0025] Figures 1-2 A printing device provided by the present application is shown, which comprises a housing 1, a cover 2 and a printer core 3. The housing 1 has an upper opening 11, and the cover 2 is rotatably supported on the housing 1 about a cover rotating shaft 51 defining a first axis line (not shown in the figure) to selectively open or close the upper opening 11. The printer core 3 comprises an upper support 31 movable with the cover 2, a lower support 32 fixedly arranged in the housing 1, a rubber roller 33 and a print head 34, the upper support 31 is rotatably connected to the lower support 32 about a support rotating shaft 52 defining a second axis line (not shown in the figure) parallel to the first axis line. One of the rubber roller 33 and the print head 34 is arranged on the lower support 32, and the other is arranged on the upper support 31, and the rubber roller 33 and the print head 34 are relatively separated when the cover 2 is opened.

[0026] The printing device further comprises a receiving bin 4 for receiving a printing paper roll, which is detachably arranged in the receiving bin 4. When the printing device is working, the cover 2 is in a closed state, and the printing paper passes between the print head 34 and the rubber roller 33, and the rubber roller 33 presses the printing paper against the print head 34 from the lower side and drives the printing paper to move, and the print head 34 can print on the upper surface of the printing paper. When the cover 2 is opened, the receiving bin 4 is exposed to the outside, and the upper support 31 and the lower support 32 of the printer core 3 are opened to facilitate the user to replace the printing paper roll and place the printing paper between the rubber roller 33 and the print head 34. In the embodiment, the axis line of the rubber roller 33 is perpendicular to the projection of the first axis line of the cover 2 in the vertical direction, and this type of cover opening is a side opening cover.

[0027] In the present application, the "closed state" of the cover 2 means that the cover 2 is locked on the housing 1 and not subjected to external force. In the present application, the extension direction of the first axis line is the front-rear direction, wherein the printer core 3 is located on the front side of the receiving bin 4; and the extension direction of the axis line of the rubber roller 33 when the cover 2 is in the closed state is the left-right direction, wherein the locking mechanism 35 (see below) is located on the left side of the first axis line.

[0028] In combination Figures 3-4 The cover rotating shaft 51 is arranged inside the housing 1. The cover 2 comprises a plurality of cover legs 21 rotatably connected to the cover rotating shaft 51, each cover leg 21 comprises a first portion 211 extending towards the housing 1 in a direction perpendicular to the cover inner wall 2 and a second portion 212 connected to the first portion 211 at an angle between 80° and 100°, and the side end of the second portion 212 away from the first portion 211 is rotatably connected to the corresponding cover rotating shaft 51.

[0029] AsFigure 4 As shown, when the cover 2 is in the closed state, the first axis defined by the cover rotating shaft 51 has a first distance d1 in the vertical direction with the upper edge of the side wall of the housing 1, and has a second distance d2 in the horizontal direction with the first part 211 of the cover foot 21. In order to enable the cover 2 to be smoothly opened to approximately 90 degrees, the following two conditions must be met: first, the first distance d1 < the second distance d2; second, in any cross section perpendicular to the direction of the first axis, the moving track of the lower edge of the cover 2 does not interfere with the outside of the housing 1, i.e. outside the circular arc with the upper edge of the housing 1 as the center and the fillet of the opening edge of the housing 1 as the tangent.

[0030] In combination Figure 7 Since the cover rotating shaft 51 of the printing device provided in the embodiment is located inside the housing 1, when the cover 2 is opened to the maximum angle, the part of the cover 2 located to the right of the vertical line passing through the first axis will rotate towards the housing 1. Thus, in order to avoid the cover 2 colliding with the housing 1 before rotating to the maximum angle, a reserved gap d3 is required between the right wall of the cover 2 and the right wall of the housing 1. However, if the reserved gap d3 is too large, the cover 2 will easily shake and is not conducive to the miniaturization of the printing device.

[0031] Through the research of the skilled person, it is found that the position of the first axis will affect the size of the reserved gap d3. Please refer to Figure 7 When the cover 2 is rotating, the lower surface S of the cover 2 close to the right wall of the housing 1 needs to avoid the right upper end a of the lower housing 1 (the right upper end a can be regarded as the boundary line of the right upper part of the lower housing, and the right upper end a can be regarded as a point when viewed from the front and rear angle, thus for convenience of description, the following point a refers to the position of the end a when viewed from the front and rear angle). It can be understood that, in order to achieve the effect of avoiding the end a, when viewed from the front and rear angle, the lower surface S (which can be regarded as a line segment when viewed from the front and rear angle) should be located outside the circle o with the rotating center (i.e. the first axis, which can be regarded as a point when viewed from the front and rear angle, thus for convenience of description, the following point o refers to the position of the first axis when viewed from the front and rear angle) as the center and the distance between the end a and the rotating center o as the radius r1.

[0032] In combination Figures 8-9, the effect of the position of the rotation center o in the vertical direction on the required reserved gap d3 between the left wall of the housing 1 and the left wall of the cover 2 will be discussed. It is assumed that the rotation center o of the cover is moved in the vertical direction and toward the cover 2 by a distance d4, and a circle o' is formed with the rotation center o' as the center and the distance between the end portion a and the rotation center o' as the radius r2. In addition, a triangle aoo' is formed by the end portion a, the rotation center o, and the rotation center o' in that order. In the triangle aoo', r2+d4>r1.

[0033] The circle o and the circle o' intersect at least at the point a, and the points a, o, and o' are not collinear, so the position relationship between the circle o and the circle o' is intersection. A vertical line L1 passing through the points o and o' is drawn, and the vertical line L1 intersects the circle o' and the circle o at the points b and c, respectively. Another intersection point of the circle o and the circle o' is the point d, which is the symmetric point of the point a with the vertical line L1 as the axis of symmetry.

[0034] Here, bo'=r1, co=r2, and r1+d4>r2, so bo>co, that is, the point b is located on the upper side of the point c. It can be seen that, in the space on the upper side of the line connecting the points a and d, the circle o' is located on the upper side of the circle o. As shown in Figure 7 It can be seen that the lower surface S is located on the side of the vertical line L1 close to the point a. A vertical line L2 is drawn between the points a and o, and the horizontal position of the vertical line L2 is defined by the leftmost end point of the lower surface S, that is, the end point on the right wall of the housing 2 closest to the circle o or the circle o'. The vertical line L2 intersects the circle o' and the circle o at the points f and e, respectively, and the point f is located on the upper side of the point e.

[0035] From the above, it can be seen that, if the rotation center of the cover 2 is located at the point o', the lower surface S should be located on the upper side of the point f; if the rotation center of the cover 2 is located at the point o, the lower surface S should be located on the upper side of the point e. It can be seen that the lower the rotation center o of the cover 2 is, the smaller the required reserved gap d3 between the right wall of the cover 2 and the right wall of the housing 1 is.

[0036] Continuing to refer to Figures 1-3 The front wall of the housing 1 defines a paper outlet 12 extending downward from the upper edge. When the cover 2 is in the closed state, the front lower edge of the upper bracket 33 and the front upper edge of the lower bracket 34 define a paper outlet gap (not shown in the figure), and the projection of the paper outlet gap in the front-rear direction falls within the projection of the paper outlet 12 in the front-rear direction.

[0037] As known from the foregoing, the upper support 31 of the printer core 3 is carried by the cover 2 to rotate. A conventional design idea is to coincide the first and second axis lines, which has the following advantages: first, the moving track of the upper support 31 coincides with that of the cover 2, so that the space for the upper support 31 to move relative to the cover 2 is not required in at least the radial direction (there can be a case that the upper support 31 does not rotate synchronously with the cover 2); second, the support rotating shaft of the printer core 3 can be used to undertake part of the function of the cover rotating shaft 51, so as to reduce the number and cost of the cover rotating shaft 51.

[0038] However, the above design idea will have adverse effects on the printing device provided by the present application, because the cover 2 needs to have an internal space (e.g. the hook 351) to accommodate at least part of the upper support 31 of the printer core 3. If the support rotating shaft 52 moves downward, the gap between the upper support 31 and the inner wall of the cover 2 increases, the internal space of the cover 2 is underutilized, and it is not conducive to reduce the thickness of the cover 2 and realize the miniaturization of the printing device. In addition, if the support rotating shaft 52 moves downward, the paper outlet gap defined by the printer core 3 moves downward synchronously, which necessitates increasing the depth of the paper outlet 12 on the front wall of the casing 1, i.e. a larger gap is generated, which affects the aesthetics of the printing device. At the same time, the internal space of the casing 1 is relatively compact, and there is no spare space in the lower part of the printer core 3. If the printer core 3 is intended to be moved downward relative to the cover 2 as a whole, the actual effect is to pull the upper edge of the casing 1 upward, which is also not conducive to the miniaturization of the printing device.

[0039] As known from the foregoing, the support rotating shaft 52 of the printing device provided by the present application is not suitable to be arranged at a lower position together with the cover rotating shaft 51. Therefore, the support rotating shaft 52 of the printing device applied by the present application is distinguished from the cover rotating shaft 51, and the second axis line defined by the support rotating shaft 52 is located on the upper side of the first axis line defined by the cover rotating shaft 51, so that the printing device can achieve miniaturization and maintain aesthetics while obtaining a smaller reserved gap d3.

[0040] Referring to Figures 1-4The printer core 3 further comprises a locking mechanism 35 configured to lock the upper support 31 to the lower support 32, and the locking mechanism 35 is arranged at a side away from the support pivot 52. The cover 2 further comprises a first cover opening hook 22 and a second cover opening hook 23, and the cover 2 has a first rotation angle and a second rotation angle relative to the shell 1, and the second rotation angle is not less than the first rotation angle. The upper support 31 is at least partially located on the moving track of the first cover opening hook 22, and the locking mechanism 35 is at least partially located on the moving track of the second cover opening hook 23. The cover 2 unlocks the locking mechanism 35 at the first rotation angle, and the first cover opening hook 22 contacts the upper support 31 when the cover 2 continues to rotate to the second rotation angle, and the first cover opening hook 22 continuously pulls the upper support 31 to rotate relative to the lower support 32 during the cover 2 passing the second rotation angle and the continuous opening process. Since the first cover opening hook 22 pulls the upper support 31, rather than the cover 2 continuously pulling the upper support 31 through the locking mechanism 35, the transmission effect is good and the relatively fragile hook 351 (see below) can be protected from being damaged by the cover 2.

[0041] The printer further comprises a cover opening torsion spring 6 connected between the shell 1 and the cover 2, and the cover opening torsion spring 6 can be a torsion spring, etc., and is not limited thereto. During the cover opening process, the cover 2 first rotates to the first rotation angle, and at this time the cover 2 drives the locking mechanism 35 to be unlocked. When the cover 2 rotates to the second rotation angle, the locking mechanism 35 has been completely unlocked, and the first cover opening hook 22 of the cover 2 contacts the upper support 31. When the cover 2 is opened from the closed state to the first rotation angle, the rotation power required by the cover 2 is at least partially provided by the cover opening torsion spring 6, and when the cover 2 is rotated to be greater than the second rotation angle, the rotation power required by the cover 2 and the upper support 31 of the core 31 is entirely provided by the cover opening torsion spring 6.

[0042] The locking mechanism 35 comprises a locking piece arranged on the upper support 31 and a matching piece arranged on the lower support 32 and adapted to the locking piece. In the embodiment, the locking piece is a hook 351, and the matching piece is a cross rod 352 extending along the direction of the first axis. The locking mechanism 35 further comprises a resilient piece (not shown in the figure) connected to the hook 351, and the hook 351 is rotationally connected to the upper support 31. The resilient piece applies a force to the hook 351 to keep the lower support 32 locked. During the process of the cover 2 being opened from the closed state to the first rotation angle, the hook 351 is driven to rotate to be unlocked.

[0043] The hook 351 is in an initial state, i.e., buckled on the cross rod 352. The hook 351 has a locking position for locking the upper support 31 to the lower support 32 and an unlocking position for allowing the upper support 31 to rotate relative to the lower support 32. It can be understood that, in order to avoid interfering with the cover 2 pulling the upper support 31, the hook 351 should be switched to the unlocking position before the cover 2 pulls the upper support 31, i.e., at the latest when the cover 2 rotates to the second rotation angle.

[0044] Specifically, the hook lock 351 comprises a locking portion (not shown in the figure) of the crossbar 352, a hook lock rotating shaft (not shown in the figure) defined with a third axis line parallel to the first axis line, and a force receiving portion (not shown in the figure) extending towards the direction where the second lid opening hook 221 is located and being capable of receiving force from the second lid opening hook 221. From the front and back direction, the force receiving portion of the hook lock 351 is arranged on the side of the vertical line passing through the crossbar 352 away from the first axis line; the locking portion of the hook lock 351 is farther away from the first axis line when in the unlocking position than when in the locking position.

[0045] When the cover 2 is closed, the second lid opening hook 221 is arranged below the force receiving portion of the hook lock 351 and is spaced apart from the force receiving portion, so as to avoid the hook lock 351 being switched to the unlocking state under the driving of the vibrating lid opening hook 221 when the cover 2 is impacted; the locking portion of the hook lock 351 locks the crossbar 352, and the locking mechanism 35 is in the locking state. During the process of the cover 2 being opened from the closed state to the first rotating angle, the second lid opening hook 221 rotates around the first axis line together with the cover 2, and the second lid opening hook 221 contacts the force receiving portion of the hook lock 351 during the rotating process and forces the hook lock 351 to rotate around the third axis line of the hook lock rotating shaft in the unlocking direction by the force receiving portion, and the locking portion of the hook lock 351 gradually separates from the crossbar 352 during the process. When the cover 2 is rotated to the first rotating angle, the locking portion of the hook lock 351 completely separates from the crossbar 352, and the locking mechanism 35 is switched from the locking state to the unlocking state.

[0046] In other embodiments, the locking member in the locking mechanism can also be a rotatable buckle, a horizontally movable sliding block lock, etc., and the cooperating member in the locking mechanism can also be a limiting protrusion integrated in the lower support, etc., and the specific structure of the locking mechanism does not limit the protection scope of the present application, as long as the locking mechanism can lock the upper support of the printer core on the lower support and can be unlocked by the cover during the process of the cover being opened from the closed state to the first rotating angle (e.g., the sliding block lock is pushed to slide in the unlocking direction by the pushing mechanism of the cover).

[0047] The upper support 31 comprises a shell 311 forming a moving space 312. The first cover opening hook 22 (see below) of the cover 2 abuts against the inner wall of the moving space 312 to drive the upper support 31 to rotate at the second rotation angle. Specifically, the upper support 31 comprises a support body 313 supporting the print head 34 and the shell 311 connected to the support body 313 and located on the upper side of the support body 313. The shell 311 can play a protective role to prevent the support body 313 from being damaged. The shell 311 has a part located on the upper side of the support body 313 and spaced apart from the support body 313 by a distance to form the moving space 312. The first cover opening hook 22 comprises a first cover opening hook 22 extending into the moving space 312. When the cover 2 is closed, the first cover opening hook 22 is located on the upper side of the support body 313 and has a gap with the support body 313. The gap can serve as a buffer space of the cover 2 and the upper support 314 to avoid external impact being transmitted to the core 31 through the first cover opening hook 22 when the cover 2 is subjected to external impact. When the cover 2 is rotated to the second rotation angle, the first cover opening hook 22 abuts against the top wall of the moving space 312.

[0048] It can be understood that, since the first axis line defined by the cover rotating shaft 51 is different from the second axis line defined by the support rotating shaft 52 and the second axis line is located on the upper side of the first axis line, when the second cover opening hook 22 drives the upper support 31 to rotate, the upper support 31 will have a tendency to move along the radial direction (the radial direction refers to the radial direction of the rotation track of the cover 2) relative to the cover 2. Therefore, the upper support 31 needs to be provided with a suitable moving space. As shown in Figure 5 the wall surface forming the moving space 312 is arranged left and right (the left and right directions refer to the radial direction corresponding to the closed state of the cover 2) of the first cover opening hook 22 to provide the moving space for the upper support 31.

[0049] Specifically, the cover 2 also has a third rotation angle. When the cover 2 is at the third rotation angle, the length direction of the upper support 31 is parallel to the extension direction of the line connecting the first axis line and the second axis line as viewed from the front and back directions, and the radial movement of the upper support 31 relative to the cover 2 reaches the maximum value. That is, during the process that the cover 2 is rotated from the closed state to the third rotation angle, the upper support 31 continuously moves outward along the radial direction relative to the cover 2, and the gap between the first cover opening hook 22 and the moving space 312 in the radial direction continuously shortens; during the process that the cover 2 is rotated from the third rotation angle to the fully open state, the upper support 31 continuously moves inward along the radial direction relative to the cover 2, and the gap between the first cover opening hook 22 and the moving space 312 in the radial direction continuously expands.

[0050] The length of the line connecting the first and second axis lines when viewed from the front-back direction (when viewed from the front-back direction, both the first and second axis lines appear as points; this length refers to the length of the line connecting the two points formed by the first and second axis lines at the front-back viewing angles) differs from the distance between the first and second axis lines in the left-right direction. To ensure that the upper support 31 has sufficient room for movement, in this embodiment, when the cover 2 is in the closed state, the gap formed between the first cover opening hook 22 and the moving space 312 in the left-right direction is not less than the aforementioned difference.

[0051] In this embodiment, when the cover 2 is in the closed state, the print head 34 of the upper bracket 31 abuts against the rubber roller 3111 on the lower bracket 32, the second cover opening hook 23 of the cover 2 is spaced apart from the locking mechanism 35, and the first cover opening hook 22 of the cover 2 is spaced apart from the upper bracket 31 (that is, the first cover opening hook 22 of the first cover opening hook 22 is spaced apart from the bracket body 313).

[0052] In this embodiment, during the closing process of the cover 2, the first opening hook 22 at least pushes against the upper bracket 31. During the closing process of the cover 2, the second opening hook 221 of the first opening hook 22 pushes against the upper side of the bracket body 313 to push the upper bracket 31 to close relative to the lower bracket 32.

[0053] according to Figure 2 As shown, the locking part of the hook lock 351 has an inclined surface (not shown) located at the bottom and tilted to the lower left, and an arc-shaped contact surface (not shown) that contacts the crossbar 352 in the locked state. When the locking mechanism 35 is in the locked state, viewed from the front and rear direction, the contact point between the hook lock 351 and the crossbar 352 is located on the side of the vertical line passing through the center of the crossbar 352, close to the first axis. Thus, when the hook lock 351 is impacted and vibrates, the force exerted by the crossbar 352 on the hook lock 351 can be decomposed into a component force toward the first axis, that is, a force toward the locking direction of the hook lock 351, thereby preventing the hook lock 351 from disengaging from the crossbar 352.

[0054] During the closing process of the cover 2, the inclined surface of the hook lock 351 first contacts the crossbar 352. The crossbar 352 applies a force to the hook lock 351 with a component force toward the left, that is, a component force toward the unlocked position of the hook lock 351, to open the hook lock 351. After the inclined surface of the hook lock 351 disengages from the crossbar 352, the contact surface of the hook lock 351 contacts the crossbar 352 and moves along the outer peripheral surface of the crossbar 352 until it reaches the locking position.

[0055] In the locked position, the contact position of the hook 351 with the crossbar 352 is not the lowest point of the outer circumferential surface of the crossbar 352. Understandably, in the locking process, the upper support 31 needs to drive the contact surface of the hook 351 to pass the lowest point of the outer circumferential surface of the crossbar 352. In addition, the main body of the locking part is in an inclined posture in the locking process, which reduces the distance between the contact surface and the center of the hook rotation shaft in the vertical direction (as shown in Figure 3 ). The above two factors make the lowest point of the moving path of the upper support 31 during the closing process of the cover 2 be below the position of the upper support 31 when the cover 2 is in the closed state.

[0056] Referring to Figure 11 , there is a gap between the cover 2 and the lower shell 1 when the cover 2 is in the closed state. Among them, the left wall of the cover 2 and the left wall of the shell 1 have a first distance d5 in the vertical direction, and the left wall of the shell 1 and the rotation center n of the cover 2 have a first length L1 in the left-right direction. The upper support body 313 has a push position that is in contact with the first cover opening hook 22 when the cover 2 is closed. When the cover 2 is closed, the first cover opening hook 22 and the push position of the upper support body 313 have a second distance d6 in the vertical direction, and the second cover opening hook 211 and the rotation center n of the cover 2 have a second length L2 in the left-right direction. The ratio of the first distance d5 to the first length L1 should be at least greater than the ratio of the second distance d6 to the second length L2, so that at least during a certain stroke after the cover 2 passes the closed position of 0° relative to the shell 1 and before the cover 2 touches the shell 1 (the touching position of the cover 2 with the shell 1 during the closing process is at the respective left wall), the first cover opening hook 22 still abuts against the upper support body 313, forcing the upper support body 313 to move to the downside of the position it is in when the cover 2 is in the closed state, and then driving the contact surface of the hook 351 to pass the lowest point of the outer circumferential surface of the crossbar 352. The margin of the ratio of the first distance d5 to the first length L1 relative to the ratio of the second distance d6 to the second length L2 should be determined according to specific factors such as the curvature of the contact surface of the hook 351, the radius and the position of the lowest point of the crossbar 352, and the inclination angle of the hook 351 in the locking process.

[0057] In the present embodiment, the cover 2 is arranged on the housing 1 to rotate around a first axis, the upper support 31 is arranged on the lower support 32 to rotate around a second axis, and the locking mechanism 35 is arranged at the end of the printer core 3 away from the second axis. The second cover hook 23 is located at the end of the cover 2 away from the first axis, and the second cover hook 23 of the cover 2 drives the locking mechanism 35 to unlock when the cover 2 is at the first rotation angle. The first cover hook 22 of the cover 2 is located between the first axis and the second cover hook 23. The cover 2 abuts against the upper wall of the moving space 312 to drive the upper support 31 to rotate when the cover 2 is at the second rotation angle. When the cover 2 is fully opened, the elastic member drives the locking mechanism 35 to return to the initial position to make the cover 2 and the upper support 31 return to the initial relative position.

[0058] Further, the hook 351 is always in the "unlocking position" during the process that the cover 2 passes the second rotation angle until it is fully opened. After the cover 2 is fully opened, the hook 351 is driven to rotate in the locking direction by the elastic force of the elastic member and simultaneously drives the upper support 31 to move towards the cover 2. Then, the upper support 31 collides with the first cover hook 22 and is bounced back. After that, the upper support 31 drives the hook 351 to rotate in the unlocking direction and compresses the elastic member, so that the upper support 31 vibrates continuously until it is stabilized under the damping action of the elastic member.

[0059] To avoid the upper support 31 from being damaged by colliding with the first cover hook 22 during repeated vibration, the present embodiment further provides an elastic buffer arm (not shown in the figure) located on the upper support 31. The elastic buffer arm extends towards the inner wall of the cover 2 and has a third distance from the inner wall of the cover 2 when the cover 2 is in the closed state. The elastic buffer arm and the rotation center n of the cover 2 have a third length in the left-right direction. The ratio of the third distance to the third length is smaller than the ratio of the second distance d6 to the second length, so that the elastic buffer arm contacts the inner wall of the cover 2 before the upper support 31 collides with the first cover hook 22, thereby buffering the upper support 31.

[0060] It can be understood that the first cover hook 22 provided in the present embodiment integrates the functions of the "linking part" for pulling the upper support 31 to open during the opening process of the cover 2 and the "pushing part" for pushing the upper support 31 to close during the closing process of the cover 2. In other embodiments, the linking part and the pushing part can be distinguished from each other, i.e., the linking part of the cover pulls the upper support to open when the cover is opened to not less than the second rotation angle, and the pushing part of the cover pushes the cover to close during the closing process of the cover. The pushing part can be configured in any shape or structure that can contact the upper support.

[0061] Referring to Figure 7 and Figure 10, now discuss the effect of the horizontal position of the rotation center on the required reserved space d3 between the right wall of the shell 1 and the right wall of the cover 2. Now assume that the rotation center o of the cover is moved a distance d7 in the horizontal left direction, then a circle o" is formed with the rotation center o" as the center and the distance between the end a and the rotation center o" as the radius r3, and a triangle aoo" is formed by connecting the end a, the rotation center o and the rotation center o" in turn. In triangle aoo", r1+d7>r3.

[0062] The circle o and the circle o' intersect at least at point a, and the points a, o and o" are not collinear, so the position relationship between the circle o and the circle o" is intersection. Now draw a horizontal line L3 passing through points o and o", and the vertical line L3 intersects the circle o" and the circle o at points g and h respectively, and the other intersection point of the circle o and the circle o" is the symmetric point i of point a with the horizontal line L1 as the axis of symmetry.

[0063] Where go=r1, ho"=r3, and r1+d7>r2, so go">ho", that is, point g is located to the right of point h. It can be seen that in the space to the left of the line connecting points a and i, the circle o" is located above the circle o. As shown in Figure 7 It can be seen that now a vertical line L4 is drawn between points a and o, and the horizontal position of the vertical line L4 is defined by the leftmost end point of the lower surface S, that is, the end point closest to the circle o or the circle o". The vertical line L4 intersects the circle o" and the circle o at points j and k respectively, and point j is located above point k.

[0064] From the above, it can be seen that if the rotation center of the cover 2 is located at point o", then the lower surface S should be located above point j; if the rotation center of the cover 2 is located at point o, then the lower surface S should be located above point k. It can be seen that the closer the rotation center o of the cover 2 is to the right wall of the shell 1, the smaller the required reserved gap d3 between the left wall of the cover 2 and the left wall of the shell 1.

[0065] Referring to Figures 1-4 , the cover opening torsion spring 6 needs to be spaced a distance from the inner wall of the shell 1 in the horizontal direction due to the need for a certain arrangement space. If the cover opening torsion spring 6 is arranged on the cover opening shaft 51, it is inevitable that the first axis line will move a distance away from the right wall of the shell 1 in the horizontal direction, thereby increasing the required reserved gap d3 between the shell 1 and the cover 2.

[0066] Therefore, in the printing device provided by the embodiment, a torsion spring shaft 53 with a fourth axis line is further arranged, and the first axis line is closer to the right wall of the shell 1 than the fourth axis line in the front-rear direction. Specifically, the torsion spring shaft 53 is arranged on the second part 212 of the cover foot 21, the cover foot 21 is provided with a first accommodating groove (not shown in the figure) for accommodating one side end of the cover opening torsion spring 6, and the interior of the shell 1 is provided with a second accommodating groove for accommodating the other side end of the cover opening torsion spring 6. In this way, the cover opening torsion spring 6 is supported on the cover foot 21 and can continuously apply a force to the cover 2 in the opening direction during the opening of the cover 2.

[0067] The above merely describes preferred specific embodiments of the present application, but the design concept of the present application is not limited thereto, and any person skilled in the art can make non-essential modifications to the present application within the technical scope disclosed by the present application, and such modifications shall also fall within the protection scope of the present application.

Claims

1. A printing device, characterized by, The printer comprises: a housing; a cover rotatably connected to the housing about a plurality of cover rotation axes defining a first axis line, the plurality of cover rotation axes being located inside the housing and close to a right wall of the housing; and a printer core comprising a lower support fixedly arranged in the housing, an upper support rotatably connected to the lower support about a support rotation axis defining a second axis line, a rubber roller and a print head, one of the rubber roller and the print head being arranged on the lower support and the other being arranged on the upper support, the upper support being movably carried by the cover, the first axis line being perpendicular to a projection of an axis line of the rubber roller on a vertical direction, the support rotation axis being close to the right wall of the housing, and the second axis line being parallel to the first axis line and located above the first axis line.

2. The printing device of claim 1, wherein, The housing is provided with a paper outlet on a front wall thereof, and when the cover is in a closed state, a paper outlet gap is defined between the upper support and the lower support, a projection of the paper outlet gap on a front-rear direction falling within a range of a projection of the paper outlet on the front-rear direction.

3. The printing device of claim 2, wherein, The paper outlet extends downward from an upper edge of the front wall of the housing.

4. The printing device of claim 1, wherein, The printer further comprises an opening cover torsion spring, the cover or the housing is further provided with a torsion spring shaft defining a third axis line and being capable of being torsionally mounted, the torsion spring shaft being located inside the housing, and the third axis line being parallel to the first axis line; as viewed from a front-rear direction, when the cover is in the closed state, the first axis line is closer to the right wall of the housing than the third axis line.

5. The printing device of claim 1, wherein, The cover comprises a plurality of cover legs, each of the cover legs comprises a first portion extending outward from an inner wall of the cover in a direction perpendicular to the inner wall of the cover and a second portion connected to the first portion at an angle between 80° and 100°, and an end portion of the second portion away from the first portion is rotatably connected to the housing via the cover rotation axis.

6. The printing device of claim 5, wherein, When the cover is in the closed state, as viewed from the front-rear direction, the first axis line has a first distance from an upper boundary of the housing in the vertical direction, and the first axis line has a second distance from the first portion in a horizontal direction, and the second distance is not less than the first distance.

7. The printing device of claim 1, wherein The upper support defines a moving space, the cover comprises a first opening cover hook capable of pulling the upper support, and at least part of a wall surface of the moving space is located on a moving track of the first opening cover hook, and when the cover is in the closed state, the first opening cover hook and the wall surface of the moving space are spaced apart in a left-right direction.

8. The printing device of claim 7, wherein, When the cover is in the closed state, the first opening cover hook and a top wall of the moving space are spaced apart in the vertical direction, the cover has a first rotation angle of rotation relative to the housing, and when the cover is at the first rotation angle, the first opening cover hook contacts the upper support to allow the cover to move the upper support.

9. The printing device of claim 8, wherein, The printer core further comprises a locking member having a locking position for locking the upper support to the lower support and an unlocking position for allowing the upper support to rotate relative to the lower support, the cover further comprises a second cover opening hook and has a second rotation angle which is not greater than the first rotation angle, the locking member is at least partially located on a moving path of the second cover opening hook, and when the cover is at the first rotation angle, the locking member is pushed to the unlocking position by the second cover opening hook.

10. The printing device of claim 9, wherein, The locking member is a hook lock, the lower support is provided with a crossbar which is adapted to the hook lock and extends along the first axial line, and when the cover is in the closed state, the contact position of the hook lock and the crossbar is located on one side of a vertical line passing through the crossbar which is close to the first axial line as viewed in the direction of the first axial line; the cover has a first side wall which is away from the first axial line, and the housing has a second side wall which is away from the first axial line; when the cover is in the closed state, the first side wall and the second side wall have a first spacing in the vertical direction, the second side wall has a first length in the horizontal direction which is perpendicular to the first axial line, the upper support body of the upper support has a pushing position which is in contact with the first cover opening hook when the cover is closed, the first cover opening hook and the pushing position of the upper support body have a second spacing in the vertical direction, and the pushing position has a second length in the horizontal direction which is perpendicular to the first axial line, and the ratio of the first spacing to the first length is greater than the ratio of the second spacing to the second length.

11. The printing device of claim 7, wherein, As viewed in the front-rear direction, the first axial line and the second axial line have a difference value which is formed by the length of the line connecting the first axial line and the second axial line and the distance between the first axial line and the second axial line in the left-right direction, and when the cover is in the closed state, the gap between the first cover opening hook and the wall of the moving space in the left-right direction is not less than the difference value.

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