Thermal printing device

Abstract

The invention provides a thermal printing device. The thermal printing device comprises a shell; the cover body is rotatably connected to the shell, and a paper outlet is defined by the shell and / or the cover body; the printer core comprises a printing head, a rubber roller, an upper support, a lower support fixedly arranged in the shell and a locking piece, the upper support can be carried by the cover body to move, the locking piece has a locking position and an unlocking position, one of the printing head and the rubber roller is arranged on the upper support, and the other one of the printing head and the rubber roller is arranged on the lower support; the pushing and abutting structure is fixedly arranged on the cover body, at least part of the locking piece is located on the moving track of the pushing and abutting structure, and when the cover body is in the closed state, the locking piece is located at the locking position; when the cover body is opened to a first angle, the pushing structure pushes the locking piece to an unlocking position; the thermal printing device further comprises a feedback piece, and the feedback piece is constructed to be capable of applying acting force towards the opening direction to the cover body at any position from the position where the cover body is opened in the closed state to the position where the cover body is unlocked.

Description

Technical Field

[0001] The invention relates to the technical field of printing equipment, in particular to a thermal printing device. Background Art

[0002] The Japanese utility model patent with the publication number JP340425U discloses a printer mechanism, which includes a lower bracket, an upper bracket rotatably supported on the lower bracket, a rubber roller, a print head, and a locking member that can lock the upper bracket to the lower bracket. Among them, one of the rubber roller and the print head is arranged on the lower bracket, and the other is arranged on the upper bracket and can be moved by the upper bracket. When this type of printer mechanism is configured in a thermal printing device, the flexible circuit board can enter the upper bracket from one end of the upper bracket close to the rotation center to supply power to various electrical components on the upper bracket. The flexible circuit board does not need to be buried in the housing of the thermal printing device, thereby greatly reducing the complexity of the wiring of the thermal printing device, and also facilitating the maintenance of the thermal printing device and reducing the failure rate of the thermal printing device.

[0003] There is a thermal printing device using the above printing mechanism, which comprises a housing, a cover body rotatably connected to the housing, and a cover opening spring. The lower bracket of the printing mechanism is predetermined in the housing, and the upper bracket can be moved by the housing to facilitate the user to replace the printing paper.

[0004] However, this type of thermal printing device has the following defects in actual use: when opening the cover of the thermal printing device, the locking member needs to be opened to apply force to the upper bracket and the lower bracket, that is, a strong cover opening spring is required. However, an overly strong cover opening spring will cause the cover to open too fast and cause impact, increasing the probability of damage to the cover and the housing and reducing the service life of the thermal printing device. Summary of the invention

[0005] In view of the defects of the above-mentioned thermal printing device, an object of the present invention is to provide a thermal printing device that can be equipped with a smaller elastic force.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a thermal printing device, comprising: a housing; a cover body, which can be rotatably connected to the housing around a rotation axis, and the housing and / or the cover body define a paper outlet; a printing mechanism, comprising a print head, a rubber roller, an upper bracket, a lower bracket fixedly arranged inside the housing, and a locking member, the upper bracket can be moved by the cover body, the locking member has a locking position that can lock the upper bracket to the lower bracket and an unlocking position that allows the upper bracket to rotate relative to the lower bracket, and one of the print head and the rubber roller is arranged The thermal printing device further comprises a feedback member, which is configured to apply a force toward the opening direction to the cover body at any position from the closed state to the unlocking angle.

[0007] In the above technical solution, preferably, the thermal printing device also includes a cover-closing hook arranged on the shell or the cover body and at least one cover-closing sensor arranged on the upper bracket and / or the lower bracket, the cover-closing hook has a first position for locking the cover body on the shell and a second position for allowing the cover body to rotate relative to the shell, and when viewed from the left and right directions, the lower bracket is offsetly arranged on a side of the shell close to the paper outlet, and compared with the cover-closing hook, the feedback member is closer to the paper outlet.

[0008] In the above preferred solutions, it is further preferred that the cover closing sensor includes 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 is arranged on the upper bracket, and the other of the light emitting element and the light receiving element is arranged on the lower bracket. It is also further preferred that the thermal printing device also includes a controller having a light intensity judgment module, the light intensity judgment module is connected to the light receiving element signal and can judge 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 cover is closed based on the light intensity received by the light receiving element.

[0009] In the above preferred scheme, it is further preferred that a cover stabilizer is further included, and when the cover body is in a closed state, the cover stabilizer can provide a force toward the opening direction to the cover body, and when viewed from the left and right directions, the cover stabilizer is farther away from the paper outlet than the cover closing hook.

[0010] In the above preferred solutions, it is further preferred that the upper bracket is rotatably connected to the lower bracket around a second axis parallel to the first axis, and the locking member is rotatably connected to a side of the upper bracket away from the second axis when viewed from the front and rear angles. It is also further preferred that the projection of the axis of the rubber roller in the vertical direction is orthogonal to the projection of the first rotation axis in the vertical direction.

[0011] In the above technical solution, preferably, when viewed from left and right directions, the closing hook is centrally arranged.

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

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

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

[0015] Compared with the prior art, the configuration provided by the technical solution of the present invention is provided with a feedback member that can continuously provide a force in the opening direction to the cover body during the process of the cover body opening from the closed state to the first angle, so as to provide power for at least a portion of the cover body to open. When the opening angle of the cover body exceeds the first angle, the cover body is driven to open by the cover opening spring alone. Due to factors such as the locking member, friction force, and the change in the center of gravity position of the cover, the force required for the cover body to be opened in the early stage is significantly greater than the force in the middle and late stages. Therefore, the thermal printing device can be equipped with a cover opening spring with weaker elasticity to reduce the movement speed of the cover body when it is opened, thereby alleviating the impact caused by the cover body and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of the thermal printing device provided by the present invention;

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

[0018] Figure 3 The thermal printing device provided by the present invention is Figure 2The partial section view obtained by the AA section line shown Figure 1 ; Wherein, the cover body shown in the figure is opened to a first angle, and the locking member is in an unlocked position;

[0019] Figure 4 The thermal printing device provided by the present invention is Figure 2 The partial section view obtained by the BB section line shown Figure 1 ; Wherein, the cover body shown in the figure is opened to a first angle, and the locking member is in an unlocked position;

[0020] Figure 5 The thermal printing device provided by the present invention is Figure 2 The partial section view obtained by the AA section line shown Figure 2 ; Wherein, the cover body shown in the figure is in a closed state, and the locking member is in a locked position;

[0021] Figure 6 The thermal printing device provided by the present invention is Figure 2 The partial section view obtained by the BB section line shown Figure 2 ; Wherein, the cover body shown in the figure is in a closed state, and the locking member is in a locked position;

[0022] Figure 7 The thermal printing device provided by the present invention is Figure 2 A partial cross-sectional view obtained along the CC section line shown; wherein the cover body shown in the figure is in a closed state.

[0023] Note in the figure:

[0024] 100. Thermal printing device;

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

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

[0027] 31. Lower bracket; 32. Upper bracket; 321. Bracket body; 322. Protective shell; 323. Activity space;

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

[0029] 4. Feedback part; 5. Cover opening spring; 6. Cover closing hook. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] The following is a first embodiment provided by the present invention, which is mainly used to introduce the technical effect of the feedback member 4 (see below) alleviating the impact between the cover body 2 (see below) and the shell 1 (see below).

[0032] Figure 1 The thermal printing device 100 provided by the present invention is shown, and the thermal printing device 100 includes a housing 1, a cover 2 and a printer mechanism. The housing 1 has an upper opening 11, and the cover 2 can be rotatably supported on the housing 1 around a first axis (not shown in the figure) to selectively open or close the upper opening 11. The printer mechanism includes an upper bracket 32 ​​and a lower bracket 31, and the upper bracket 32 ​​can be rotatably supported on the lower bracket 31 around a second axis (not shown in the figure) parallel to the first axis, and the lower bracket 31 is fixedly arranged in the housing 1. The printer mechanism also includes a rubber roller 33 and a print head 34 arranged oppositely. In this embodiment, the print head 34 is arranged on the upper bracket 32, and the rubber roller 33 is arranged on the lower bracket 31. In some simple replacements, the print head 34 can also be arranged on the lower bracket 31, and the rubber roller 33 is arranged on the upper bracket 32, but it is not limited to this.

[0033] The upper bracket 32 ​​can be carried and moved by the cover body 2. The housing 1 is also provided with a paper support structure 12, which is used to receive a printing paper roll, and the printing paper roll is detachably arranged in the paper support structure 12. When the thermal printing device 100 is working, the cover body 2 is in a closed state, and the printing paper moves along the paper feeding path defined by the thermal printing device 100 and passes between the print head 34 and the rubber roller 33. The rubber roller 33 presses the printing paper against the print head 34 from the lower side and drives the printing paper to move. The print head 34 can print on the upper surface of the printing paper; when the cover body 2 is opened, the paper support structure 12 is exposed to the outside, and the upper bracket 32 ​​and the lower bracket 31 of the printing mechanism are opened, so that the user can replace the printing paper roll and place the printing paper between the rubber roller 33 and the print head 34. In this embodiment, the axis of the rubber roller 33 and the projection of the first axis of the cover body 2 in the vertical direction are perpendicular to each other, and this type of opening method is a side opening method.

[0034] In the present application, the "closed state" of the cover 2 and the "closed state" of the thermal printing device 100 both refer to the state in which the cover 2 is locked on the housing 1 and is not subjected to external force. In the present application, the extension direction of the first axis is the front-to-back direction, wherein the printer mechanism is located at the front side of the paper support structure 12; the extension direction of the axis of the rubber roller 33 when the cover 2 is in the closed state is the left-to-right direction, wherein the locking mechanism (see below) is located at the left side of the first axis.

[0035] See also Figure 2 , Figure 3 and Figure 4The printer mechanism also includes a locking mechanism that can lock the upper support 32 of the mechanism to the lower support 31, and the locking mechanism can be controlled to release the locking state of the upper support 32 and the lower support 31. The thermal printing device 100 is also equipped with a cover opening spring 5 at the connection between the housing 1 and the cover 2, and the cover 2 also includes a linkage part 21 and a push structure 22. The cover opening spring 5 can be a torsion spring, etc., but is not limited thereto.

[0036] The cover body 2 has a first angle and a second angle for rotation relative to the shell body 1, and the second angle is not less than the first angle. Among them, at least a part of the upper bracket 32 ​​is located on the moving track of the linkage part 21, and at least a part of the locking mechanism is located on the moving track of the push structure 22. When the cover body 2 is at the first angle, the locking mechanism is unlocked, and when the cover body 2 continues to rotate to the second angle, the linkage part 21 contacts the upper bracket 32. When the cover body 2 passes the second angle and continues to open, the linkage part 21 continuously pulls the upper bracket 32 ​​to rotate relative to the lower bracket 31. Since the upper bracket 32 ​​is pulled by the linkage part 21 instead of the cover body 2 continuously pulling the upper bracket 32 ​​by the locking mechanism, the transmission effect is good and the relatively fragile hook lock 35 (see below) can be protected from being damaged by the cover body 2.

[0037] When the cover 2 is opened from the closed state to a first angle, the rotational power required by the cover 2 is at least partially provided by the cover opening spring 5, and when it is rotated to a greater angle than the second angle, the rotational power required by the cover 2 and the upper bracket 32 ​​of the movement 3 is completely provided by the cover opening spring 5.

[0038] The locking mechanism includes a locking member disposed on the upper bracket 32 ​​and a matching member disposed on the lower bracket 31 and adapted to the locking member. In the present embodiment, the locking member is a hook lock 35, and the matching member is a cross bar 36 extending in the direction of the first axis. The locking mechanism also includes an elastic member (not shown in the figure) connected to the hook lock 35, and the hook lock 35 is rotatably connected to the side of the upper bracket 32 ​​away from the second axis. The elastic member applies a force to the hook lock 35 to keep the lower bracket 31 locked. When the cover body 2 is opened from the closed state to the first angle, the hook lock 35 will be driven to rotate to achieve unlocking.

[0039] The hook lock 35 is buckled on the cross bar 36 in the initial state. The hook lock 35 has a locking position for locking the upper bracket 32 ​​on the lower bracket 31 and an unlocking position for allowing the upper bracket 32 ​​to rotate relative to the lower bracket 31. It can be understood that in order to avoid interference with the cover body 2 pulling the upper bracket 32, the hook lock 35 should be switched to the unlocking position before the cover body 2 pulls the upper bracket 32 ​​(that is, at the latest when the cover body 2 rotates to the second angle).

[0040] In this embodiment, the push-against structure 22 is configured as a hook extending in the direction of the hook lock 35, and the hook lock 35 includes a locking portion (not shown in the figure) capable of locking the crossbar 36, a hook lock rotating shaft (not shown in the figure) defining a third axis parallel to the first axis, and a force-bearing portion (not shown in the figure) extending in the direction of the push-against structure 22 and capable of applying force to the push-against structure 22. When viewed from the front-to-back direction, the force-bearing portion of the hook lock 35 is arranged on the side of the vertical line passing through the crossbar 36 away from the first axis.

[0041] When the cover body 2 is closed, the push structure 22 is located at the lower side of the force-bearing part of the hook lock 35 and is spaced from the force-bearing part to prevent the hook lock 35 from switching to the unlocked state under the drive of the vibrating push structure 22 when the cover body 2 is impacted. In this case, the locking part of the hook lock 35 locks the cross bar 36, and the hook lock 35 is kept in the locked position under the action of the elastic member. In the process of the cover body 2 opening from the closed state to the first angle, the push structure 22 rotates around the first axis together with the cover body 2. During the rotation process, the push structure 22 contacts the force-bearing part of the hook lock 35 and applies force to the force-bearing part to force the hook lock 35 to rotate in the unlocking direction. The locking part of the hook lock 35 gradually disengages from the cross bar 36 during the process. When the cover body 2 rotates to the first angle, the locking part of the hook lock 35 gradually disengages from the cross bar 36, and the locking mechanism switches from the locked position to the unlocked position.

[0042] In other embodiments, the locking member in the locking mechanism may also be a rotatable buckle, a horizontally movable slider lock or the like, and the mating member in the locking mechanism may also be a limit protrusion integrated in the lower bracket or the like. Under the premise that the locking mechanism can lock the upper bracket of the printer movement onto the lower bracket and the cover body can be unlocked by the cover body in the process of moving from a closed state to a first angle (such as pushing the slider lock to slide in the unlocking direction through the push structure of the cover body), the specific structure of the locking mechanism does not limit the scope of protection of the present application.

[0043] The upper bracket 32 ​​includes a bracket body 321 supporting the print head 34 and a protective shell 322 connected to the bracket body 321. The protective shell 322 is located on the upper side of the bracket body 321. The protective shell 322 can play a protective role to prevent the bracket body 321 from being damaged. A portion of the protective shell 322 is located on the upper side of the bracket body 321 and is separated from the bracket body 321 by a distance to form an activity space 323. In this embodiment, the linkage part 21 is configured as a linkage part 21 extending into the activity space 323. When the cover body 2 is closed, the linkage part 21 is located on the upper side of the bracket body 321 and has a gap with the bracket body 321. The gap can be used as a buffer space between the cover body 2 and the upper bracket 32 ​​to prevent the cover body 2 from being transmitted to the movement 3 through the linkage part 21 when the cover body 2 is subjected to an external impact. When the cover body 2 rotates to the second angle, the linkage part 21 abuts against the top wall of the activity space 323.

[0044] In other embodiments, the structural design of the protective shell or the movable space can also be cancelled. When the above three technical features are met, namely, at least a part of the upper bracket (such as the side of the upper bracket) is located on the rotation path of the linkage part, the linkage part is separated from the upper bracket between the closed state of the cover body and the second angle (excluding the two side end points), and the linkage part contacts the upper bracket when the cover body is at the second angle, the technical effect of the linkage part pulling the upper bracket after the cover body is at the second angle can be achieved.

[0045] In other embodiments, the linkage part may also be a pull ring (the tension spring is tightened when the angle of the cover body is not less than the first angle), a flexible connector (such as a rope or chain with two ends connecting the cover body and the upper bracket, and the flexible connector is tightened when the angle of the cover body is not less than the first angle) and other structures; in addition, a hook lock or a hook structure may be arranged on the upper bracket of the printer mechanism, and an activity space adapted thereto may be arranged on the cover body (the relevant wall surface constituting the activity space is the linkage part of the cover body in this type of embodiment), and when the angle of the cover body is not less than the second angle, the hook lock or the hook on the upper bracket presses against the wall surface of the activity space of the cover body, so that the cover body can pull the upper bracket of the printer mechanism. Therefore, under the premise that the linkage part of the cover body satisfies the requirement that a force in the direction of opening the upper bracket can be applied to the upper bracket of the printer mechanism when the cover body is opened to the second angle, the specific structure of the linkage part does not have a limiting effect on the protection scope of the present invention.

[0046] During the opening process of the cover 2, when the cover 2 rotates from the closed state to the first angle (hereinafter referred to as the first stage), 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 lock 35 (including the force required to force the upper bracket 32 ​​to move downward), and the remaining part comes from the weight of the cover 2 and the friction between the cover 2 and the housing 1. When the cover 2 rotates 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 crossing the second angle until the cover 2 is fully opened (hereinafter referred to as the third stage), the rotation resistance of the cover 2 comes from the gravity of itself, the upper bracket 32 ​​of the printer mechanism, and the print head 34. In actual application scenarios, the weight of the cover 2 and the upper bracket 32 ​​is small, while the resistance generated by the cross bar 36 on the hook lock 35 is large. In addition, considering that the proportion of the velocity component of the center of gravity of the cover 2 in the vertical direction gradually decreases during the first, second, and third stages, the rotation power required in the first stage during the opening of the cover 2 is significantly greater than the rotation power required in the second and third stages.

[0047] However, if the cover opening spring 5 is used to provide all the rotational power required for the cover body 2 to be in the first stage, it is necessary to configure the cover opening spring 5 with greater elasticity, which will make the cover body 2 rotate faster when it is in the second and third stages, and will have a greater impact with the shell 1 at the end of the rotation, which may easily damage the shell 1 and the cover body 2 and shorten the service life of the thermal printing device 100.

[0048] To this end, the thermal printing device 100 provided by the present invention is further provided with a feedback member 4. Figure 3 and Figure 5 The feedback member 4 provided in this embodiment is disposed on the printer mechanism or housing 1, and is an elastic arm structure with a protrusion at the end that can abut against the inner wall of the cover body 2. The feedback member 4 is configured so that when the cover body 2 is in any position in the first stage, the feedback member 4 abuts against the inner wall of the cover body 2 and applies a force toward the opening direction to the cover body 2, that is, when the cover body 2 is opened to the first angle from the closed state, the feedback member 4 continues to apply force to the cover body 2.

[0049] When the cover body 2 is in the first stage, the upper bracket 32 ​​of the printer mechanism does not move with the cover body 2, and the cover body 2 is opened under the joint action of the feedback member 4 and the cover-opening spring 5, that is, the rotational power of the cover body 2 in the first stage is provided by the feedback member 4 and the cover-opening spring 5; when the cover body 2 is in the third stage, the upper bracket 32 ​​moves together with the cover body 2, if the feedback member 4 applies force to the cover body 2, the force is the internal force between the cover body 2 and the upper bracket 32, and does not hinder the rotation of the cover body 2, that is, when the cover body 2 is in the third stage, no matter whether the feedback member 4 applies force or not, it will not hinder the rotation of the cover body 2.

[0050] Therefore, the thermal printing device 100 can be equipped with a relatively weak cover opening spring 5 to slow down the rotation speed of the cover body 2 in the second and third stages, and avoid a large impact between the cover body 2 and the housing 1 at the end of the rotation. In a preferred embodiment, the elastic force of the cover opening spring 5 is only equal to the rotation power required by the cover body 2 in the third stage, and the remaining rotation power required by the cover body 2 in the first stage is all provided by the feedback member 4.

[0051] In other embodiments, the feedback member may also be a spring, a pair of magnets respectively disposed on the housing (or the upper bracket of the printer mechanism) and the cover body and repelling each other, or any deformable structure that can apply force to the cover body. On the premise that the feedback member can continuously apply force on the cover body in the opening direction when the cover body is in the first stage, the specific structure and type of the feedback member do not limit the protection scope of the present invention.

[0052] The following is the second embodiment provided by the present invention, which is mainly used to introduce the technical effect of the feedback member 4 preventing the sensor from misjudging the closing of the thermal printing device 100. Since the specific structures adopted in the first and second embodiments are the same, the second embodiment uses the drawings and drawings of the first embodiment, and the second embodiment below only describes the structure of the thermal printing device 100 that is not disclosed in the first embodiment, and the remaining structures can be compared with the first embodiment. However, it should be noted that this does not mean that the first and second embodiments are equivalent, nor does it mean that the technical effects of the feedback members in the first and second embodiments are the same, but only indicates that the first and second embodiments have the same inventive concept.

[0053] The thermal printing device 100 further includes a cover-closing hook 6 , which has 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 mechanism is also provided with a photoelectric sensor, which includes a light emitting element disposed on one of the upper bracket 32 ​​and the lower bracket 31 and a light receiving element disposed 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 arranged opposite to each other, thereby detecting whether the thermal printing device 100 is in the closed state. In other embodiments, other types of sensors with closed-cover detection functions may also be used, such as a reflective photoelectric sensor, a Hall element sensor, etc.

[0055] The cover body 2 and / or the housing 1 define a pair of paper outlets 13 exposed to the outside, and the paper outlets 13 are arranged at the front of the thermal printing device 100. When viewed from the left and right directions, the printer mechanism is offset and arranged near the paper outlet 13 of the thermal printing device 100, and the cover-closing hook 6 is farther away from the paper outlet 13 than the printer mechanism (i.e., the paper outlet 13, the printer mechanism and the cover-closing hook 6 are arranged in sequence from front to back).

[0056] When this type of thermal printing device 100 is in the closed state, there is still a gap between the cover body 2 and the housing 1. This type of thermal printing device 100 has the situation that the cover hook 6 is not locked in place, the hook lock 35 is in the locked position, and the optical sensor determines that the thermal printing device 100 is in the closed state (for example, the user closes the cover by pressing the cover body 2 close to the paper outlet, causing the cover body 2 to tilt and causing the cover hook 6 to not be locked in place). In the above situation, if the elastic force of the cover opening spring 5 is weak, it cannot automatically drive the cover body 2 to unlock the hook lock 35, which will cause the thermal printing device 100 to make a wrong judgment based on the feedback of the photoelectric sensor and operate in an unstable state. Among them, the weak elastic force of the cover opening spring 5 may be caused by aging, partial damage, or as in the first embodiment described above, to reduce the impact between the cover body 2 and the housing 1.

[0057] One feasible solution is to add a pair of cover closing sensors on the side of the cover closing 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] Here, the present invention provides a technical solution that can solve the above-mentioned problems and has a simple, reliable structure and low cost. The thermal printing device 100 provided by the present invention also includes a feedback member 4 arranged on the housing 1 or the printer mechanism. When viewed from the left and right angles, the feedback member 4 is arranged on the side of the cover hook 6 close to the paper outlet 13. The feedback member 4 is configured so that when the cover body 2 is in any position in the first stage, the feedback member 4 abuts against the inner wall of the cover body 2 and applies a force in the opening direction to the cover body 2, that is, when the cover body 2 is opened to the first angle from the closed state, the feedback member 4 continues to apply force to the cover body 2.

[0059] See also Figure 3-7 When the cover hook 6 is fully engaged, the cover body 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 exerted by the elastic member. In this case, the force exerted by the feedback member 4 on the cover body 2 cannot drive the cover body 2 to rotate, so the hook lock 35 will not be unlocked.

[0060] When the cover-closing hook 6 is not completely engaged and the upper bracket 32 ​​is locked to the lower bracket 31 under the action of the hook lock 35, since the cover body 2 is not locked, after the external force is removed, the cover body 2 moves in the opening direction under the action of the cover-opening spring 5 and the feedback member 4. Before the cover body 2 is opened to the first angle, the upper bracket 32 ​​remains basically stationary. Under the joint action of the feedback member 4 and the cover-opening spring 5, the cover body 2 is opened to the first angle and the hook lock 35 is pushed to the unlocking position, and the photoelectric sensor will determine that the thermal printing device 100 is not closed, thereby preventing the thermal printing device 100 from working in an unstable state.

[0061] The feedback member 4 provided in this embodiment is an elastic arm structure with a protrusion. In other embodiments, the feedback member can also be a spring, a pair of magnets respectively disposed on the housing (or the upper bracket of the printer mechanism) and the cover body and repelling each other, or any deformable structure that can apply force to the cover body. On the premise that the feedback member can continuously apply force on the cover body in the opening direction when the cover body is in the first stage, the specific structure and type of the feedback member do not limit the protection scope of the present invention.

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

[0063] It can be understood that the technical solution provided in this embodiment can also be applied to a thermal printing device with a roughly similar structure but without a cover-opening spring or the cover-opening structure only allows the cover to be opened to a first angle (such thermal printing device can be opened manually by the user after the hook lock is unlocked), and achieve the technical effect of "preventing misjudgment of cover closing".

[0064] Furthermore, the printing mechanism 23 also includes a controller (not shown in the figure) having a light intensity judgment module, which is connected to the light receiving element signal and can judge whether the cover body 2 is in a closed state and whether there is printing paper between the upper bracket 32 ​​and the lower bracket 31 through the different light intensities received by the light receiving element.

[0065] The following is a third embodiment provided by the present invention, which is mainly used to introduce the technical effect of the feedback member 4 buffering the collision between the upper bracket and the cover body 2 after the cover body 2 is opened. Similarly, the third embodiment uses the drawings and drawings of the first embodiment, and the third embodiment below only describes the structure of the thermal printing device 100 that is not disclosed in the first and second embodiments, and the remaining structures can be compared with the first and second embodiments.

[0066] See also Figure 3 and Figure 5 During the process of the cover body 2 passing the second rotation angle until it is fully opened, the hook lock 35 is always in the "unlocking position", the linkage part 21 contacts the top wall of the activity space 323 and is spaced apart from the bracket body 321; after the cover body 2 is fully opened, the hook lock 35 rotates in the locking direction by the elastic force of the elastic member, and the upper bracket 32 ​​moves toward the cover body 2 under the action of inertia and the hook lock 35; thereafter, the upper bracket body 321 collides with the linkage part 21 and is rebounded; thereafter, the upper bracket 32 ​​drives the hook lock 35 to rotate in the unlocking direction and compresses the elastic member, so that the upper bracket 32 ​​vibrates continuously until it is stabilized under the damping action of the elastic member.

[0067] In order to prevent the upper bracket 32 ​​from colliding with the linkage part 21 and being damaged during repeated vibration, the feedback member 4 of this embodiment is integrated on the top of the upper bracket 32. The feedback member 4 is configured so that when the cover 2 is at any position in the first stage, the feedback member 4 abuts against the inner wall of the cover 2 and applies a force toward the opening direction to the cover 2, that is, when the cover 2 is opened to the first angle from the closed state, the feedback member 4 continuously applies force to the cover 2.

[0068] When the cover 2 is in the closed state, the linkage part 21 is spaced apart from the bracket body 321. Therefore, when the cover 2 is fully opened, the feedback member 4 can apply a force toward the opening direction to the cover 2 before the linkage part 21 collides with the bracket body 321, that is, apply a force opposite to the above force to the upper bracket 32, slowing down the speed at which the upper bracket 32 ​​moves toward the cover 2, thereby alleviating the collision between the cover 2 and the upper bracket 32.

[0069] The feedback member 4 provided in this embodiment is an elastic arm structure with a protrusion. In other embodiments, the feedback member can also be a spring, a pair of magnets respectively disposed on the upper bracket and the cover body and repelling each other, or any deformable structure that can apply force to the cover body. Under the premise that the feedback member can continuously apply force on the cover body in the opening direction when the cover body is in the first stage, the specific structure and type of the feedback member do not limit the protection scope of the present invention.

[0070] The above are only preferred specific implementations of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. A thermal printing device, characterized in that: include: case; The cover body is rotatably connected to the shell body around a rotation axis, and the shell body and / or the cover body define a paper outlet; A printer mechanism, comprising a print head, a rubber roller, an upper bracket, a lower bracket fixedly arranged inside the housing, and a locking member, wherein the upper bracket can be carried and moved by the cover body, and the locking member has a locking position for locking the upper bracket to the lower bracket and an unlocking position for allowing the upper bracket to rotate relative to the lower bracket, wherein one of the print head and the rubber roller is arranged on the upper bracket, and the other is arranged on the lower bracket; A push structure is fixedly arranged on the cover body, the locking member is at least partially located on the moving track of the push structure, and when the cover body is in a closed state, the locking member is located at the locking position; When the cover is opened to the first angle, the push structure pushes the locking member to the unlocking position; Wherein, the thermal printing device further comprises a feedback member, and the feedback member is configured to apply a force in an opening direction to the cover body when the cover body is opened from a closed state to any position within the unlocking angle.

2. The thermal printing device according to claim 1, characterized in that: It also includes a cover closing hook arranged on the shell or the cover body and at least one cover closing sensor arranged on the upper bracket and / or the lower bracket, the cover closing hook has a first position for locking the cover body on the shell and a second position for allowing the cover body to rotate relative to the shell. When viewed from the left and right directions, the lower bracket is offsetly arranged on a side of the shell close to the paper outlet, and compared with the cover closing hook, the feedback member is closer to the paper outlet.

3. The thermal printing device according to claim 2, characterized in that: The cover closing 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 is arranged on the upper bracket, and the other one is arranged on the lower bracket.

4. The thermal printing device according to claim 3, characterized in that: It also includes a controller with a light intensity judgment module, which is connected to the light receiving element signal and can judge 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 cover is closed based on the light intensity received by the light receiving element.

5. The thermal printing device according to claim 2, characterized in that: It also includes a cover stabilizer, which can provide a force toward the opening direction to the cover body when the cover body is in a closed state. When viewed from the left and right directions, the cover stabilizer is farther away from the paper outlet than the cover closing hook.

6. The thermal printing device according to claim 1 or 2, characterized in that: The upper bracket can be rotatably connected to the lower bracket around a second axis parallel to the first axis. When viewed from a front-to-back angle, the locking member can be rotatably connected to a side of the upper bracket away from the second axis.

7. The thermal printing device 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 rotation axis in the vertical direction.

8. The thermal printing device according to claim 1 or 2, characterized in that: When viewed from the left and right directions, the closing hook is centrally arranged.

9. The thermal printing device according to claim 1 or 2, characterized in that: The feedback member is integrated on the top of the upper bracket.

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

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