Thermal printing apparatus

Abstract

The application provides a thermal printing device, comprising: a housing; a cover rotatably connected to the housing, the housing and / or the cover defining a paper outlet; a printer core comprising a print head, a rubber roller, an upper support, a lower support fixedly arranged in the housing, and a locking member, the upper support being movably carried by the cover, the locking member having a locking position and an unlocking position, one of the print head and the rubber roller being arranged on the upper support and the other being arranged on the lower support; a pushing structure fixedly arranged on the cover, at least part of the locking member being located on a moving track of the pushing structure, the locking member being located at the locking position when the cover is in a closed state; the cover being opened to a first angle, the pushing structure pushing the locking member to the unlocking position; wherein the thermal printing device further comprises a feedback member configured to apply an action force to the cover in an opening direction when the cover is opened from the closed state to any position within the first angle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing equipment, and particularly relates to a thermal printing device. BACKGROUND

[0002] Japanese Utility Model Patent No. JP340425U discloses a printer core, which comprises a lower support, an upper support rotatably supported on the lower support, a rubber roller, a print head, and a locking member capable of locking the upper support on 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. When the printer core is arranged in a thermal printing device, a flexible circuit board can enter the upper support from one end of the upper support close to the rotation center to supply power to each electric component on the upper support. The flexible circuit board does not need to be embedded in the shell of the thermal printing device, thereby greatly reducing the complexity of the wiring of the thermal printing device, and facilitating the maintenance and reducing the failure rate of the thermal printing device.

[0003] A thermal printing device of the prior art adopts the above printer core, which has a shell, a cover rotatably connected to the shell, and a cover opening spring. The lower support of the printer core is predetermined in the shell, and the upper support can be moved by the shell to facilitate the user to replace the printing paper.

[0004] However, the thermal printing device has the following defects in actual use: the thermal printing device needs to open the locking member to exert force on the upper support and the lower support during the cover opening process, that is, a cover opening spring with relatively strong elasticity needs to be arranged. However, the cover opening spring with too strong elasticity will make the cover too fast during the opening process and cause impact, thereby increasing the probability of damage of the cover and the shell and reducing the service life of the thermal printing device. SUMMARY

[0005] In view of the defects of the above thermal printing device, the present application aims to provide a thermal printing device which can be equipped with a smaller elastic force.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions: a thermal printing device, comprising: a housing; a cover body rotatably connected to the housing about a first axis line, the housing and / or the cover body defining a paper outlet; a printer core comprising a print head, a rubber roller, an upper support, a lower support fixedly arranged in the housing, and a locking member, the upper support being movably carried by the cover body, the 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, one of the print head and the rubber roller being arranged on the upper support and the other being arranged on the lower support; a pushing structure fixedly arranged on the cover body, at least part of the locking member being located on a movement track of the pushing structure, the locking member being located at the locking position when the cover body is in a closed state, the pushing structure pushing the locking member to the unlocking position when the cover body is opened to a first angle; wherein the thermal printing device further comprises a feedback member configured to apply a force to the cover body in an opening direction when the cover body is opened from the closed state to any position within the first angle.

[0007] In the above-mentioned technical solution, preferably, the thermal printing device further comprises a cover latching member arranged on the housing or the cover body and at least one cover sensor arranged on the upper support and / or the lower support, the cover latching member having a first position for locking the cover body to the housing and a second position for allowing the cover body to rotate relative to the housing, the lower support being arranged on one side of the housing close to the paper outlet in a left-right direction, and the feedback member being closer to the paper outlet than the cover latching member.

[0008] In the above-mentioned preferred solution, further preferably, the cover sensor comprises a light emitting element and a light receiving element arranged opposite to the light emitting element, one of the light emitting element and the light receiving element being arranged on the upper support and the other being arranged on the lower support. Further preferably, the thermal printing device further comprises a controller having a light intensity judgment module, the light intensity judgment module being signal-connected to the light receiving element and being capable of judging whether the thermal printing device is covered and whether there is a printing paper between the light emitting element and the light receiving element when the thermal printing device is covered based on the light intensity received by the light receiving element.

[0009] In the above preferred embodiment, it is further preferred to include a cover stabilizer, which provides a force toward the opening direction to the cover when the cover is in the closed state. When viewed from the left and right, the cover stabilizer is further away from the paper outlet than the cover latch.

[0010] In the preferred embodiment described above, and even more preferably, the upper bracket is rotatably connected to the lower bracket about a second axis parallel to the first axis, and viewed from a front-rear angle, the locking member is rotatably connected to the side of the upper bracket away from the second axis. Even more preferably, the projection of the axis of the rubber roller in the vertical direction is orthogonal to the projection of the first axis in the vertical direction.

[0011] In the above technical solution, preferably, when viewed from the left and right sides, the cover hook is centered.

[0012] In the above technical solution, preferably, the feedback element is integrated into the top of the upper bracket.

[0013] In the above technical solution, preferably, the feedback element is an elastic arm, a spring, or a pair of magnets.

[0014] In the above technical solution, preferably, the thermal printing device further includes a linkage part, which is disposed on the cover and applies a force toward the opening direction to the upper support when the cover is opened to a second angle greater than the first angle.

[0015] Compared to existing technologies, the present invention provides a configuration that continuously provides a force in the opening direction to the cover as it opens from the closed state to a first angle, thus providing power for at least partially opening the cover. Once the cover opens beyond the first angle, the opening spring alone drives the cover to open. Due to factors such as locking components, friction, and changes in the cover's center of gravity, the force required for the cover to open initially is significantly greater than the force required in the middle and final stages. Therefore, this thermal printing device can be equipped with a less elastic opening spring to reduce the cover's movement speed during opening, thereby mitigating the impact between the cover and the housing. Attached Figure Description

[0016] Figure 1 A perspective view of the thermal printing apparatus provided by the present invention;

[0017] Figure 2 for Figure 1 Top view of the thermal printing device shown;

[0018] Figure 3 The thermal printing apparatus provided by the present invention is based on Figure 2Partial section view obtained by the AA section line shown Figure 1 In the figure, the cover is opened to the first angle, and the locking element is in the unlocked position.

[0019] Figure 4 The thermal printing apparatus provided by the present invention is based on Figure 2 Partial section view obtained by the BB section line shown Figure 1 In the figure, the cover is opened to the first angle, and the locking element is in the unlocked position.

[0020] Figure 5 The thermal printing apparatus provided by the present invention is based on Figure 2 Partial section view obtained by the AA section line shown Figure 2 In the figure, the cover is in the closed state and the locking element is in the locked position.

[0021] Figure 6 The thermal printing apparatus provided by the present invention is based on Figure 2 Partial section view obtained by the BB section line shown Figure 2 In the figure, the cover is in the closed state and the locking element is in the locked position.

[0022] Figure 7 The thermal printing apparatus provided by the present invention is based on Figure 2 The figure shows a partial sectional view obtained from the CC section line; in which the cover shown in the figure is in the closed state.

[0023] The image is labeled as follows:

[0024] 100. Thermal printing device;

[0025] 1. Shell; 11. Top opening; 12. Paper support structure; 13. Paper outlet;

[0026] 2. Cover; 21. Connecting part; 22. Pushing structure;

[0027] 31. Lower support; 32. Upper support; 321. Support body; 322. Protective shell; 323. Movement space;

[0028] 33. Rubber roller; 34. Print head; 35. Hook lock; 36. Crossbar;

[0029] 4. Feedback component; 5. Opening spring; 6. Closing hook. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] The following is the first embodiment of the present application, which is mainly used to introduce the technical effect of the feedback member 4 (see below) to alleviate the impact of the cover 2 (see below) and the shell 1 (see below).

[0032] Figure 1 The heat-sensitive printing device 100 provided by the present application is shown, which comprises a shell 1, a cover 2 and a printer core. The shell 1 has an upper opening 11, and the cover 2 is rotatably supported on the shell 1 around a first axis line (not shown in the figure) to selectively open or close the upper opening 11. The printer core comprises an upper support 32 and a lower support 31, the upper support 32 is rotatably supported on the lower support 31 around a second axis line (not shown in the figure) parallel to the first axis line, and the lower support 31 is fixedly arranged in the shell 1. The printer core further comprises oppositely arranged rubber rollers 33 and a print head 34. In this embodiment, the print head 34 is arranged on the upper support 32, and the rubber rollers 33 are arranged on the lower support 31, but in some simple alternatives, the print head 34 can also be arranged on the lower support 31, and the rubber rollers 33 are arranged on the upper support 32, without being limited thereto.

[0033] The upper support 32 can be carried and moved by the cover 2. The shell 1 is further provided with a paper support structure 12 for receiving a printing paper roll, which is arranged in the paper support structure 12 in a detachable manner. When the heat-sensitive printing device 100 is working, the cover 2 is in a closed state, the printing paper moves along the paper path defined by the heat-sensitive printing device 100 and passes between the print head 34 and the rubber rollers 33, the rubber rollers 33 abut the print head 34 from the lower side and drive 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 paper support structure 12 is exposed to the outside, and the upper support 32 and the lower support 31 of the printer core are opened to facilitate the user to replace the printing paper roll and place the printing paper between the rubber rollers 33 and the print head 34. In this embodiment, the axis line of the rubber rollers 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.

[0034] In this application, the "closed state" of the cover 2 and the "cover closed state" of the heat-sensitive printing device 100 both mean that the cover 2 is locked on the shell 1 and not subjected to external force. In this application, the extension direction of the first axis line is the front-rear direction, wherein the printer core is located on the front side of the paper support structure 12; and the extension direction of the axis line of the rubber rollers 33 when the cover 2 is in the closed state is the left-right direction, wherein the locking mechanism (see below) is located on the left side of the first axis line.

[0035] Referring to Figure 2 , Figure 3 and Figure 4The printer core further comprises a locking mechanism configured to lock the upper support 32 to the lower support 31, and the locking mechanism is controllable to release the locking state of the upper support 32 and the lower support 31. The thermal printing device 100 further comprises an opening spring 5 arranged at the joint of the housing 1 and the cover 2, and the cover 2 further comprises a linkage portion 21 and a pushing structure 22. The opening spring 5 can be a torsion spring, but is not limited thereto.

[0036] The cover 2 has a first angle and a second angle relative to the housing 1, and the second angle is not less than the first angle. At least part of the upper support 32 is located on the moving track of the linkage portion 21, and at least part of the locking mechanism is located on the moving track of the pushing structure 22. The cover 2 releases the locking mechanism when the cover 2 is at the first angle, and the linkage portion 21 contacts the upper support 32 when the cover 2 is continuously rotated to the second angle. During the process that the cover 2 passes the second angle and continuously opens, the linkage portion 21 continuously pulls the upper support 32 relative to the lower support 31. Since the linkage portion 21 pulls the upper support 32, rather than the cover 2 continuously pulling the upper support 32 through the locking mechanism, the transmission effect is good, and the relatively fragile hook 35 (see below) can be protected from being damaged by the cover 2.

[0037] When the cover 2 is opened from the closed state to the first angle, the rotating power required by the cover 2 is at least partially provided by the opening spring 5, and when the cover 2 is rotated to be greater than the second angle, the rotating power required by the cover 2 and the upper support 32 of the core 3 is entirely provided by the opening spring 5.

[0038] The locking mechanism comprises a locking piece arranged on the upper support 32 and a matching piece arranged on the lower support 31 and adapted to the locking piece. In the embodiment, the locking piece is a hook 35, and the matching piece is a crossbar 36 extending along the direction of the first axis. The locking mechanism further comprises a resilient piece (not shown in the figure) connected to the hook 35, and the hook 35 is rotationally connected to the side of the upper support 32 away from the second axis. The resilient piece applies a force to the hook 35 to keep the hook 35 locked to the lower support 31. During the process that the cover 2 is opened from the closed state to the first angle, the hook 35 is rotated to be released.

[0039] The hook 35 is buckled on the crossbar 36 in the initial state. The hook 35 has a locking position to lock the upper support 32 to the lower support 31 and an unlocking position to allow the upper support 32 to rotate relative to the lower support 31. It can be understood that, in order to avoid interference with the cover 2 pulling the upper support 32, the hook 35 should be switched to the unlocking position before the cover 2 pulls the upper support 32 (i.e. at the latest when the cover 2 is rotated to the second angle).

[0040] In the embodiment, the pushing structure 22 is configured as a hook extending towards the hook 35, the hook 35 includes a locking portion (not shown in the figure) capable of locking the horizontal bar 36, a hook rotating shaft (not shown in the figure) defining a third axis of rotation parallel to the first axis of rotation, and a force receiving portion (not shown in the figure) extending towards the pushing structure 22 and capable of receiving force from the pushing structure 22. As viewed from the front and back directions, the force receiving portion of the hook 35 is arranged on the side of the vertical line passing through the horizontal bar 36 away from the first axis of rotation.

[0041] When the cover 2 is closed, the pushing structure 22 is located below the force receiving portion of the hook 35 and is spaced apart from the force receiving portion, so as to avoid the hook 35 being switched to the unlocked state under the driving of the vibrating pushing structure 22 when the cover 2 is impacted. In this case, the locking portion of the hook 35 locks the horizontal bar 36, and the hook 35 is kept in the locked position under the action of the elastic member. During the process of the cover 2 being opened from the closed state to the first angle, the pushing structure 22 rotates around the first axis of rotation together with the cover 2, and the pushing structure 22 contacts and exerts force on the force receiving portion of the hook 35 during the rotation, so as to force the hook 35 to rotate in the unlocking direction, and the locking portion of the hook 35 gradually disengages from the horizontal bar 36 during the process. When the cover 2 is rotated to the first angle, the locking portion of the hook 35 is completely disengaged from the horizontal bar 36, and the locking mechanism is switched from the locked position to the unlocked position.

[0042] In other embodiments, the locking member in the locking mechanism can also be a rotatable buckle, a horizontally movable slide lock or the like structure, and the cooperating member in the locking mechanism can also be a limiting protrusion integrated with the lower support or the like structure. As long as the locking mechanism can lock the upper support of the printer core on the lower support and can be unlocked (e.g., the slide lock is pushed by the pushing structure of the cover in the unlocking direction) by the cover during the process of the cover being opened from the closed state to the first angle, the specific structure of the locking mechanism does not limit the protection scope of the present application.

[0043] The upper support 32 includes a support body 321 supporting the print head 34 and a protective shell 322 connected to the support body 321, the protective shell 322 is located on the upper side of the support body 321 and can play a protective role to prevent the support body 321 from being damaged. The protective shell 322 has a part located on the upper side of the support body 321 and spaced apart from the support body 321 by a distance to form an activity space 323. In the embodiment, the linkage 21 is configured as the linkage 21 extending into the activity space 323. When the cover 2 is closed, the linkage 21 is located on the upper side of the support body 321 and has a gap with the support body 321, which can serve as a buffer space of the cover 2 and the upper support 32, so as to avoid external impact being transmitted to the core 3 through the linkage 21 when the cover 2 is impacted. When the cover 2 is rotated to the second angle, the linkage 21 abuts against the top wall of the activity space 323.

[0044] In other embodiments, the above-mentioned protective shell or the structure design of the active space can also be cancelled, and the technical effect of the upper support being pulled by the linkage after the cover is at the second angle can be achieved as long as the following three technical features are met: at least part of the upper support (such as the side of the upper support) is located on the rotation path of the linkage, the linkage is disengaged from the upper support between the cover being in the closed state and the second angle (excluding both end points), and the linkage contacts the upper support when the cover is at the second angle.

[0045] In other embodiments, the linkage can also be a pull ring (the pull spring is tightened when the angle of the cover is not less than the first angle), a flexible connecting member (such as a rope or chain with two ends connected to the cover and the upper support, respectively, the flexible connecting member is tightened when the angle of the cover is not less than the first angle), and the like. In addition, a hook or catch structure can also be configured on the upper support of the printer core, and a corresponding active space is configured on the cover (the relevant wall surface constituting the active space is the linkage of the cover in this type of embodiment). When the angle of the cover is not less than the second angle, the hook or catch on the upper support abuts against the wall surface of the active space of the cover, so that the cover can pull the upper support of the printer core. Therefore, as long as the linkage of the cover meets the premise that the cover can apply a force to the upper support of the printer core in the direction of opening the upper support when the cover is opened to the second angle, the specific structure of the linkage does not limit the scope of protection of the present application.

[0046] During the opening process of the cover 2, the rotation resistance of the cover 2 mainly comes from the elastic force of the locking mechanism and the resistance generated by the cross bar 36 on the hook 35 (including the force required to move the upper support 32 downward) during the rotation of the cover 2 from the closed state to the first angle (hereinafter referred to as the first stage), and the remaining part comes from the weight of the cover 2 and the friction between the cover 2 and the shell 1. During the rotation of the cover 2 from the first angle to the second angle (hereinafter referred to as the second stage), the rotation resistance of the cover 2 comes from its own gravity. During the process of the cover 2 passing through the second angle until the cover 2 is completely opened (hereinafter referred to as the third stage), the rotation resistance of the cover 2 comes from its own, the upper support 32 of the printer core, and the weight of the print head 34. In actual application scenarios, the weight of the cover 2 and the upper support 32 is small, and the resistance generated by the cross bar 36 on the hook 35 is large. In addition, considering that the vertical velocity component of the center of gravity of the cover 2 gradually decreases during the first, second, and third stages, the rotation power required during the first stage is obviously greater than that required during the second and third stages.

[0047] But if the opening spring 5 provides all the rotation power of the cover 2 in the first stage, it is necessary to configure the opening spring 5 with a larger elasticity, which will make the cover 2 rotate faster in the second and third stages, and will cause a larger impact between the cover 2 and the shell 1 at the end of rotation, thus easily damaging the shell 1 and the cover 2 and shortening the service life of the thermal printing device 100.

[0048] Therefore, the thermal printing device 100 provided by the present application is further configured with a feedback member 4. Referring to Figure 3 With Figure 5 the feedback member 4 provided by the present embodiment is configured on the printer core or the shell 1, and is a resilient arm structure which can abut against the inner wall of the cover 2 and has a protrusion at the end. The feedback member 4 is configured to, when the cover 2 is in any position in the first stage, abut against the inner wall of the cover 2 and apply a force to the cover 2 in the opening direction, that is, the feedback member 4 continuously applies a force to the cover 2 during the process of opening the cover 2 from the closed state to the first angle.

[0049] When the cover 2 is in the first stage, the upper support 32 of the printer core does not move with the cover 2, and the cover 2 is opened under the joint action of the feedback member 4 and the opening spring 5, that is, the rotation power of the cover 2 in the first stage is provided by the feedback member 4 and the opening spring 5 together; when the cover 2 is in the third stage, the upper support 32 moves with the cover 2, and if the feedback member 4 applies a force to the cover 2, the force is an internal force between the cover 2 and the upper support 32 and does not hinder the rotation of the cover 2, that is, whether the feedback member 4 applies a force or not, it does not hinder the rotation of the cover 2 in the third stage.

[0050] Therefore, the thermal printing device 100 can be configured with an opening spring 5 with a weaker elasticity, which slows down the rotation speed of the cover 2 in the second and third stages and avoids a larger impact between the cover 2 and the shell 1 at the end of rotation. In a preferred embodiment, the elastic force of the opening spring 5 is only equal to the rotation power required by the cover 2 in the third stage, and the remaining rotation power required by the cover 2 in the first stage is provided by the feedback member 4.

[0051] In other embodiments, the feedback member can also be a spring, a pair of magnets respectively configured on the shell (or the upper support of the printer core) and the cover and repelling each other, or any deformable structure which can apply a force to the cover. As long as the feedback member can continuously apply a force to the cover in the opening direction when the cover is in the first stage, the specific structure and type of the feedback member do not limit the protection scope of the present application.

[0052] The following is a second embodiment provided by the present application, which is mainly used to introduce the technical effect of the feedback member 4 to avoid the sensor misjudging that the heat-sensitive printing device 100 is closed. Since the specific structures adopted by the first and second embodiments are consistent, the second embodiment follows the drawings and reference numerals of the first embodiment, and the following second embodiment only describes the structure of the heat-sensitive printing device 100 that is not disclosed in the first embodiment. The remaining structure can be referred to the first embodiment. However, it needs to be noted that this does not mean that the first and second embodiments are equivalent, and even less means that the technical effects of the feedback members in the first and second embodiments are the same. It can only indicate that the first and second embodiments have the same inventive concept.

[0053] The heat-sensitive printing device 100 further comprises a closing cover hook 6 having a first position for locking the cover 2 on the housing 1 and a second position for allowing the cover 2 to rotate relative to the housing 1.

[0054] The printer core is further provided with a photoelectric sensor, which comprises a light emitting element arranged on one of the upper bracket 32 and the lower bracket 31, and a light receiving element arranged on the other of the upper bracket 32 and the lower bracket 31. When the cover 2 is in the closed state, the light emitting element and the light receiving element of the photoelectric sensor are oppositely arranged, thereby detecting whether the heat-sensitive printing device 100 is in the closed state. In other embodiments, other types of sensors with closing detection function can also be used, such as reflective photoelectric sensors, Hall element sensors, etc.

[0055] The cover 2 or / and the housing 1 defines a pair of exposed paper outlets 13, which are arranged at the front of the heat-sensitive printing device 100. From the left and right direction, the printer core is arranged offsetly close to the paper outlet 13 of the heat-sensitive printing device 100, and the closing cover hook 6 is farther away from the paper outlet 13 than the printer core (i.e., the paper outlet 13, the printer core, and the closing cover hook 6 are arranged in sequence from front to back).

[0056] Since such heat-sensitive printing device 100 is in the closed state, the cover 2 and the housing 1 still have a gap. In the case that the closing cover hook 6 is not engaged in place, the hook lock 35 is in the locked position, and the photoelectric sensor judges that the heat-sensitive printing device 100 is in the closed state (for example, the user closes the cover by pressing the part of the cover 2 close to the paper outlet, causing the cover 2 to tilt and resulting in that the closing cover hook 6 is not engaged in place), the heat-sensitive printing device 100 cannot be automatically unlocked by the cover opening spring 5. In the above case, if the cover opening spring 5 has a weak spring force, the heat-sensitive printing device 100 will be misjudged based on the feedback of the photoelectric sensor and run in an unstable state. The weak spring force of the cover opening spring 5 may be caused by aging, partial damage, or the like as described in the first embodiment to reduce the impact between the cover 2 and the housing 1.

[0057] A feasible solution is to add a pair of cover sensors on the side of the cover clamping hook 6 away from the paper outlet 13, but this solution will increase the cost and wiring complexity of the thermal printing device 100.

[0058] In this embodiment, the feedback member 4 is a protruding elastic arm structure, but in other embodiments, the feedback member can also be a spring, a pair of magnets respectively arranged on the shell (or the upper support of the printer core) and the cover and repel each other, or any deformable structure that can apply force to the cover. As long as the feedback member can continuously apply force to the cover in the opening direction when the cover is in the first stage, the specific structure and type of the feedback member do not limit the scope of protection of the present application.

[0059] Referring to Figures 3-7 When the cover clamping hook 6 is fully engaged, the cover 2 is fixed in the closed state, the push mechanism 22 is spaced apart from the hook lock 35, and the hook lock 35 is held in the locked position by the elastic force of the elastic member. In this case, the force applied by the feedback member 4 to the cover 2 cannot drive the cover 2 to rotate, so the hook lock 35 will not be unlocked.

[0060] When the cover clamping hook 6 is not fully engaged and the upper support 32 is locked to the lower support 31 by the hook lock 35, since the cover 2 is not locked, after the external force is removed, the cover 2 moves in the opening direction under the action of the cover opening spring 5 and the feedback member 4. Before the cover 2 is opened to the first angle, the upper support 32 remains substantially stationary. Under the combined action of the feedback member 4 and the cover opening spring 5, the cover 2 is opened to the first angle and pushes the hook lock 35 to the unlocked position, and the photoelectric sensor determines that the thermal printing device 100 is not covered, thereby avoiding the thermal printing device 100 working in an unstable state.

[0061] The feedback member 4 provided in this embodiment is a protruding elastic arm structure, but in other embodiments, the feedback member can also be a spring, a pair of magnets respectively arranged on the shell (or the upper support of the printer core) and the cover and repel each other, or any deformable structure that can apply force to the cover. As long as the feedback member can continuously apply force to the cover in the opening direction when the cover is in the first stage, the specific structure and type of the feedback member do not limit the scope of protection of the present application.

[0062] Further, the thermal printing device 100 further comprises a cover stabilizer (not shown in the figure) disposed at least partially on the housing 1, which is located at the side of the cover hook 6 away from the paper outlet 12 when viewed from the left and right. The cover stabilizer is configured to provide an upward force to the cover 2 when the thermal printing device 100 is in the closed state, so that the cover 2 tends to be stable under the joint action of the feedback member 4, the cover hook 6 and the cover stabilizer, and does not shake due to the gap between the cover 2 and the housing 1. The cover stabilizer can be a structure with elastic ratio, a spring, a pair of magnets respectively arranged on the housing and the cover and repelling each other, any deformable structure that can apply force to the cover, or a rigid structure suitable for supporting the cover 2 when the thermal printing device is in the closed state.

[0063] It can be understood that the technical solutions provided by the embodiment can also be applied to thermal printing devices with approximately the same structure but without a cover opening spring or a cover opening structure that only provides opening of the cover to a first angle (such thermal printing devices are manually opened by the user after the hook is unlocked), and achieve the technical effect of "preventing false closing".

[0064] Further, the printer core 23 further comprises a controller (not shown in the figure) having a light intensity judgment module, which is signal connected with the light receiving element and can judge whether the cover 2 is in the closed state and whether there is printing paper between the upper support 32 and the lower support 31 through different light intensities received by the light receiving element.

[0065] The following is a third embodiment provided by the present application, which is mainly used to introduce the technical effect of the feedback member 4 buffering the mutual collision of the upper support and the cover 2 after the cover 2 is opened. Similarly, the third embodiment uses the drawings and reference numerals of the first embodiment, and the following third embodiment only describes the structure of the thermal printing device 100 that is not disclosed in the first and second embodiments, and the remaining structure can be referred to the first and second embodiments.

[0066] Referring to Figure 3 and Figure 5 . During the process of the cover 2 passing the second rotation angle until being completely opened, the hook 35 is always in the "unlocked position", the connecting part 21 contacts the top wall of the active space 323 and is spaced apart from the support body 321; after the cover 2 is completely opened, the hook 35 is rotated to the locking direction by the elastic force of the elastic member, and the upper support 32 moves towards the cover 2 under the action of inertia and the hook 35; thereafter, the upper support body 321 collides with the connecting part 21 and is bounced back; thereafter, the upper support 32 drives the hook 35 to rotate towards the unlocking direction and compresses the elastic member, so that the upper support 32 continuously vibrates until being stable under the damping action of the elastic member.

[0067] To avoid the upper support 32 from being damaged by colliding with the linkage 21 during repeated vibration, the feedback member 4 of the present embodiment is integrated on the top of the upper support 32. The feedback member 4 is configured to abut against the inner wall of the cover 2 and apply a force to the cover 2 in the opening direction when the cover 2 is in any position in the first stage, i.e. the feedback member 4 continuously applies a force to the cover 2 during the process of the cover 2 being opened from the closed state to the first angle.

[0068] When the cover 2 is in the closed state, the linkage 21 is spaced apart from the support body 321. Thus, when the cover 2 is fully opened, the feedback member 4 can apply a force to the cover 2 in the opening direction before the linkage 21 collides with the support body 321, i.e. the feedback member 4 applies an opposite force to the upper support 32 to the force described above, which slows down the speed of the upper support 32 moving towards the cover 2, thereby alleviating the collision between the cover 2 and the upper support 32.

[0069] The feedback member 4 provided by the present embodiment is a resilient arm structure with a protrusion. In other embodiments, the feedback member can also be a spring, a pair of magnets respectively arranged on the upper support and the cover and repelling each other, or any deformable structure that can apply a force to the cover. As long as the feedback member can continuously apply a force to the cover in the opening direction when the cover is in the first stage, the specific structure and type of the feedback member do not limit the scope of protection of the present application.

[0070] The above is only the preferred specific embodiment of the present application, but the design concept of the present application is not limited thereto. Any person skilled in the art who is familiar with the technology within the scope of the present application can make non-essential modifications to the present application using this concept, which shall be deemed as an infringement of the scope of protection of the present application.

Claims

1. A thermal printing device, characterized in that, include: case; A cover is rotatably connected to the housing about a first axis, and the housing and / or the cover defines an exposed paper outlet. A printer module includes a print head, a rubber roller, an upper bracket, a lower bracket fixedly disposed inside the housing, and a locking member. The upper bracket can be moved by the cover. The locking member has a locking position that locks the upper bracket to the lower bracket and an unlocking position that allows the upper bracket to rotate relative to the lower bracket. One of the print head and the rubber roller is disposed on the upper bracket, and the other is disposed on the lower bracket. A push-off structure is fixedly installed on the cover. At least part of the locking member is located on the movement trajectory of the push-off structure. When the cover is in the closed state, the locking member is located in the locking position. When the cover is opened to the first angle, the pushing structure pushes the locking member to the unlocked position; The thermal printing device further includes a feedback element, which is configured to apply a force toward the opening direction to the cover at any position from the closed state to the first angle.

2. The thermal printing apparatus according to claim 1, characterized in that, It also includes a cover latch disposed on the housing or the cover and at least one cover sensor disposed on the upper bracket and / or the lower bracket. The cover latch has a first position that locks the cover onto the housing and a second position that allows the cover to rotate relative to the housing. Viewed from the left and right, the lower bracket is offset on the side of the housing closer to the paper outlet. The feedback element is closer to the paper outlet than the cover latch.

3. The thermal printing apparatus according to claim 2, characterized in that, The cover sensor includes a light emitting element and a light receiving element disposed opposite to the light emitting element. One of the light emitting element and the light receiving element is disposed on the upper support, and the other is disposed on the lower support.

4. The thermal printing apparatus according to claim 3, characterized in that, It also includes a controller with a light intensity determination module, which is signal-connected to the light receiving element and can determine whether the thermal printing device is closed and whether there is printing paper between the light emitting element and the light receiving element when the device is closed based on the light intensity received by the light receiving element.

5. The thermal printing apparatus according to claim 2, characterized in that, It also includes a cover stabilizer, which provides a force toward the opening direction to the cover when the cover is in the closed state. Viewed from the left and right, the cover stabilizer is further away from the paper outlet than the cover latch.

6. The thermal printing apparatus according to claim 1 or 2, characterized in that, The upper bracket is rotatably connected to the lower bracket about a second axis parallel to the first axis. When viewed from the front or rear, the locking member is rotatably connected to the side of the upper bracket away from the second axis.

7. The thermal printing apparatus according to claim 6, characterized in that, The projection of the axis of the rubber roller in the vertical direction is orthogonal to the projection of the first axis in the vertical direction.

8. The thermal printing apparatus according to claim 2, characterized in that, Viewed from the left and right, the cover hook is centered.

9. The thermal printing apparatus according to claim 1 or 2, characterized in that, The feedback element is integrated into the top of the upper bracket.

10. The thermal printing apparatus according to claim 1 or 2, characterized in that, It also includes a linkage that is disposed on the cover and applies a force toward the opening direction to the upper support when the cover is opened to a second angle greater than the first angle.

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