Printing module and printer

Abstract

The present invention relates to the technical field of printers, and specifically discloses a printing module and a printer. The printing module includes a shell, a printing roller unit, a limiting unit and a head unit. The head unit includes a driving mechanism and a printing mechanism supported by the shell. The limiting unit includes a positioning mechanism. The positioning mechanism includes a rotating shaft supported by the shell and a cam fixed to the rotating shaft. The cam abuts against the printing mechanism to limit a first distance value between the printing mechanism and the printing roller. The driving mechanism includes a driving member and an elastic element. The printing mechanism can approach the printing roller of the printing roller unit under the drive of the driving member to record the printed content on a recording medium, and can move away from the printing roller and abut against the positioning mechanism under the drive of the elastic element. Since the positions of the cam and the rotating shaft relative to the shell are stable, the first distance value is not affected by the cylinder intake pressure factor, which can ensure the stability of the position of the printing mechanism when it is away from the printing roller, thereby ensuring a stable printing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, and in particular to a printing module and a printer. Background Art

[0002] The thermal transfer printer includes a printing module, which includes a printing mechanism and a printing roller. The print head of the printing mechanism can be tangentially matched with the printing roller. At this time, the printing mechanism is in the printing position. The print head can press the carbon ribbon and the recording medium against the printing roller, and transfer the ink on the carbon ribbon to the recording medium to print the date, barcode, etc. When the area on the recording medium that does not need to be printed passes through the print head, the print head needs to be lifted. At this time, the printing mechanism is in the waiting position for printing, and the print head and the printing roller are separated, which can save the carbon ribbon. Before printing starts, the printing mechanism is in the waiting position for printing. When printing content, the printing mechanism can be driven by the driving mechanism and pressed down to the printing position. During the entire printing process, the printing mechanism needs to frequently switch between the printing position and the waiting position for printing.

[0003] In the prior art, the printing mechanism is usually supported at the position to be printed by pneumatic components such as cylinders, so that the printing mechanism can be further driven to switch between the printing position and the waiting printing position by pneumatic components such as cylinders. In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: when the air supply source is insufficient, the air pressure of the cylinder used to support the printing mechanism at the position to be printed is insufficient, and it will retreat when subjected to the force of the printing mechanism, resulting in unclear printing; when a cylinder fails, it is necessary to check or repair both cylinders at the same time to identify the failed cylinder, which is troublesome to repair and causes a lot of waste of work time. Summary of the invention

[0004] The purpose of the present invention is to provide a printing module and a printer to solve the problem in the prior art that when the air supply source of the printing module is insufficient, the air pressure of the cylinder used to support the printing mechanism at the printing position is insufficient, and the printing module will move backward when subjected to the force of the printing mechanism, resulting in unclear printing.

[0005] In one aspect, the present invention provides a printing module, comprising:

[0006] case;

[0007] a printing roller unit, comprising a printing roller supported by the housing and used to support a fed recording medium;

[0008] a limiting unit, comprising a positioning mechanism supported on the housing; and

[0009] A head unit, comprising a printing mechanism supported by the housing and having a print head, and a driving mechanism, wherein the driving mechanism comprises a driving member and an elastic element both connected between the housing and the printing mechanism, the printing mechanism being arranged between the printing roller unit and the limiting unit, the printing mechanism being able to approach the printing roller under the driving of the driving member to record the printed content on the recording medium, and the printing mechanism being able to move away from the printing roller under the driving of the elastic element and abut against the positioning mechanism to limit a first distance value between the printing mechanism and the printing roller;

[0010] The positioning mechanism comprises:

[0011] a rotating shaft rotatably supported on the housing; and

[0012] A cam fixedly connected to the rotating shaft, and an outer periphery of the cam has a first contact portion;

[0013] When the cam follows the rotating shaft to rotate to a preset position along the first direction, the cam can abut against the printing mechanism through the first contact portion to limit the first distance value.

[0014] As a preferred technical solution for the printing module, along the rotation direction of the shaft and along the axial direction of the shaft, each position on the first contact portion is equidistant from the axis of the shaft, so that the force transmitted to the cam by the printing mechanism is directed toward the axis of the shaft.

[0015] As a preferred technical solution of the printing module, the printing module includes a clamping member arranged on the rotating shaft and an elastic member sleeved on the rotating shaft;

[0016] The two ends of the elastic member are respectively in contact with the shell and the rotating shaft. At least when the cam is located at the preset position, the elastic member has a tendency to drive the rotating shaft to move along the axial direction of the rotating shaft so that the clamping member is in contact with the shell.

[0017] As a preferred technical solution of the printing module, the rotating shaft can rotate relative to the housing and has a first position and a second position;

[0018] When the rotating shaft is located at the first position, the first contact portion is separated from the printing mechanism, and the printing mechanism is at a second distance value from the printing roller, and the second distance value is greater than the first distance value; when the rotating shaft is located at the second position, the first contact portion can abut against the printing mechanism, and the rotating shaft is located at the preset position;

[0019] At least when the rotating shaft is located at the second position, the elastic member is in a compressed state.

[0020] As a preferred technical solution for the printing module, a guide slope is provided on the outer end face of the shell, and the guide slope extends along the circumferential direction of the rotating shaft. The height of the guide slope gradually increases along the first direction. The clamping member can abut against the guide slope, and in the process of the rotating shaft switching from the first position to the second position, the elastic member switches from a naturally extended state to a compressed state.

[0021] As a preferred technical solution of the printing module, the number of the guide ramps is two, and the two guide ramps are symmetrically arranged about the axis center of the rotating shaft, and the clamping member abuts against the two guide ramps at the same time.

[0022] As a preferred technical solution for the printing module, the positioning mechanism includes a handle fixed to one end of the rotating shaft. When the rotating shaft is located at the second position, the handle can abut against the shell to prevent the handle from continuing to drive the rotating shaft to rotate along the first direction.

[0023] As a preferred technical solution of the printing module, a limiting groove is provided on one of the housing and the handle, and a plug is convexly provided on the other, the limiting groove is arc-shaped, and the center line of the limiting groove coincides with the center line of the rotating shaft, the limiting groove has a first limiting surface and a second limiting surface located at both ends of the extending direction thereof, and the plug can be slidably inserted into the limiting groove;

[0024] When the rotating shaft is located at the first position, the plug post abuts against the first limiting surface, and when the rotating shaft is located at the second position, the plug post abuts against the second limiting surface.

[0025] As a preferred technical solution of the printing module, the shell is provided with a stop block. When the cam rotates along the rotating shaft along the first direction to the preset position, the stop block abuts against the clamping member to prevent the rotating shaft from continuing to rotate along the first direction.

[0026] As an optimal technical solution for the printing module, the shell is provided with a latching protrusion, and the latching member can pass over the latching protrusion as the rotating shaft rotates along the first direction, and when the cam is located at the preset position, the latching member can abut against the latching protrusion along a second direction, and the second direction is opposite to the first direction.

[0027] As a preferred technical solution of the printing module, the printing module includes a detection member arranged on the shell, and the detection member is used to detect the position of the card member. Only when the cam rotates along the first direction with the rotating shaft to the preset position, the detection member cooperates with the card member and the detection member sends a first detection signal.

[0028] As a preferred technical solution of the printing module, the printing mechanism includes:

[0029] an adapter frame, on which a connecting piece capable of abutting against the first contact portion is provided, and the printing mechanism is arranged on the adapter frame; and

[0030] The bracket is fixed to the shell, and the driving member includes a body and an output rod that can be telescopic relative to the body. One of the body and the output rod is fixed to the adapter frame, and the other is fixed to the bracket.

[0031] On the other hand, the present invention further provides a printer, comprising the printing module described in any one of the above solutions.

[0032] The beneficial effects of the present invention are:

[0033] The present invention provides a printing module and a printer, the printing module comprises a housing, a printing roller unit, a limiting unit and a head unit, the head unit comprises a printing mechanism supported by the housing and having a printing head, and a driving mechanism, the limiting unit comprises a positioning mechanism, the positioning mechanism comprises a rotating shaft supported by the housing and a cam fixed to the rotating shaft, the cam abuts against the printing mechanism to limit a first distance value between the printing mechanism and the printing roller, the driving mechanism comprises a driving member and an elastic element both connected between the housing and the printing mechanism, the printing mechanism is arranged between the printing roller unit and the limiting unit, the printing mechanism can approach the printing roller of the printing roller unit under the driving of the driving member to record the printed content on the recording medium, and the printing mechanism can be driven away from the printing roller and abut against the positioning mechanism of the limiting unit under the driving of the elastic element. Compared with the prior art, the position of the cam and the rotating shaft relative to the housing is stable, so that the first distance value is not affected by the cylinder intake pressure, and the position stability of the printing mechanism when it is away from the printing roller can be ensured, thereby ensuring a stable printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The structure of the printer in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0035] Figure 2 The structure of the printer in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0036] Figure 3 The structure of the printer in the embodiment of the present invention is shown in FIG. Figure 3 ;

[0037] Figure 4 is a cross-sectional view of a printing mechanism in an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of the structure of a printing mechanism in an embodiment of the present invention;

[0039] Figure 6is a cross-sectional view of a printing module and a carbon ribbon conveying mechanism in an embodiment of the present invention;

[0040] Figure 7 It is a partial structural schematic diagram of the printing mechanism in the embodiment of the present invention when it is located at the printing position;

[0041] Figure 8 It is a structural schematic diagram of the part when the printing mechanism is located at the standby position in the embodiment of the present invention;

[0042] Fig. 9 It is a partial structural schematic diagram of the printing mechanism in the embodiment of the present invention when it is located at the initial position;

[0043] Fig.10 The structure of the limiting unit in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0044] Fig.11 The structure of the limiting unit in the embodiment of the present invention is shown in FIG. Figure 2 .

[0045] In the figure:

[0046] 1. Shell; 11. First shell; 111. Limiting groove; 1111. First limiting surface; 1112. Second limiting surface; 12. Second shell;

[0047] 2. Positioning mechanism; 21. Cam; 22. Rotating shaft; 23. Handle; 231. Insertion column; 24. Clamp; 25. Elastic member;

[0048] 3. Printing mechanism; 30. Print head; 31. Adapter; 32. Bracket; 33. Connecting member; 331. Connecting rod; 332. Roller; 34. Slide rail; 35. Slider; 36. Driving member; 361. Main body; 362. Output rod; 37. Elastic element; 38. Connecting shaft; 39. Connecting pin;

[0049] 41. first shaft sleeve; 42. second shaft sleeve; 421. shaft hole; 422. avoidance hole; 423. guide slope; 424. clamping convex; 425. stop block;

[0050] 5. Print roller;

[0051] 6. Inspection parts;

[0052] 71. Release roller; 72. Winding roller; 73. Support roller;

[0053] 100, carbon ribbon; 200, recording medium. DETAILED DESCRIPTION

[0054] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0058] Please refer to Figures 1 to 11 The present embodiment provides a printer, which is preferably a thermal transfer printer, and includes a printing module, which includes a housing 1, a printing roller unit, a limiting unit, and a head unit. The head unit and the printing roller unit cooperate to transfer the ink on the carbon ribbon 100 to a recording medium 200, and the recording medium 200 may be a bill, a deposit slip, a receipt, a label paper, a tissue paper, and various soft packages such as food, medicine, and daily chemicals.

[0059] The housing 1 includes a first housing 11 and a second housing 12. The first housing 11 can be separated or snapped relative to the second housing 12. When the first housing 11 and the second housing 12 are snapped together, the first housing 11 and the second housing 12 enclose a receiving cavity, and the print roller unit and the head unit are both received in the receiving cavity to ensure the safety of the printing operation. By making the first housing 11 separable relative to the second housing 12, it is convenient to maintain the print roller unit and the head unit.

[0060] Please refer to Figure 2 The printer includes a ribbon conveying mechanism disposed on the first housing 11, the ribbon conveying mechanism includes a release roller 71, a take-up roller 72 and a plurality of support rollers 73, the release roller 71, the take-up roller 72 and the support roller 73 are all rotatably connected to the first housing 11, the release roller 71 is used to fix the ribbon roll, and the take-up roller 72 is used to rotate under the drive of the motor to recycle the ribbon 100. The various components of the ribbon conveying mechanism are rotatably disposed on the first housing 11, so that it is convenient to replace the ribbon roll.

[0061] The printing roller unit includes a printing roller 5 supported by the housing 1 and used to support the feeding recording medium 200. Specifically, the printing roller 5 is supported by the first housing 11 and is located below the head unit. The printing roller 5 is preferably a rubber roller. The printing roller 5 can be fixedly arranged on the first housing 11 or rotatably arranged on the first housing 11, and the recording medium 200 and the carbon ribbon 100 both pass between the printing roller 5 and the head unit.

[0062] The limiting unit includes a positioning mechanism 2 supported on the housing 1, and the head unit includes a printing mechanism 3 supported on the housing 1 and having a print head 30, and a driving mechanism. The driving mechanism has a driving member 36 and an elastic element 37 both connected between the housing 1 and the printing mechanism 3. The printing mechanism 3 is arranged between the print roller unit and the limiting unit. The printing mechanism 3 can approach the print roller 5 under the drive of the driving member 36 to record the print content on the recording medium 200 through the print head 30, and the printing mechanism 3 can be driven by the elastic element 37 to move away from the print roller 5 and abut against the positioning mechanism 2 to limit the first distance value between the printing mechanism 3 and the print roller 5. In this embodiment, the first distance value refers to the distance between the print head 30 of the printing mechanism 3 and the print roller 5. Specifically, with the cooperation of the driving member 36 and the elastic element 37, the printing mechanism 3 can move relative to the housing 1 and have a printing position and a position to be printed, and the printing mechanism 3 can move between the printing position and the position to be printed relative to the housing 1. Figure 7 As shown, when the printing mechanism 3 is located at the printing position, the printing head 30 of the printing mechanism 3 and the printing roller 5 are tangentially matched, and the printing head 30 can record the printed content on the recording medium 200. Figure 8As shown, when the printing mechanism 3 is located at the position to be printed, the print head 30 and the print roller 5 are spaced apart, and at this time, the print head 30 of the printing mechanism 3 is at a first distance from the print roller 5. The driving member 36 can drive the printing mechanism 3 to overcome the elastic force of the elastic element 37 and move from the position to be printed to the printing position. When the driving force provided by the driving member 36 is canceled, the elastic element 37 can drive the printing mechanism 3 to move from the printing position to the position to be printed. At this time, under the restriction of the positioning mechanism 2, the printing mechanism 3 can stop at the position to be printed.

[0063] Please refer to Figure 2 , Fig.10 and Fig.11 The positioning mechanism 2 includes a rotating shaft 22 and a cam 21. The rotating shaft 22 is rotatably supported on the housing 1. In this embodiment, the rotating shaft 22 is rotatably supported on the first housing 111 and the second housing 121. The cam 21 is fixed to the rotating shaft 22, and the outer periphery of the cam 21 has a first contact portion. When the cam 21 rotates along the first direction to a preset position following the rotating shaft 22, it can contact the printing mechanism 3 through the first contact portion to limit the first distance value. The first direction is as follows Figure 6 As shown in the ab direction in FIG. Of course, in other embodiments, the positioning mechanism 2 can also be set as an electric push rod, a cylinder, a lead screw nut, etc. as needed. Since the positions of the cam 21 and the rotating shaft 22 are stable, and the rotating shaft 22 can be supported on the housing 1, the relative positions of the cam 21 and the housing 1 are stable, and then, when the cam 21 abuts against the printing mechanism 3, the position of the printing mechanism 3 can be guaranteed to be stable. Compared with the prior art, the printing mechanism 3 will not deviate from the position to be printed due to insufficient cylinder air pressure, so as to ensure the accuracy of the first distance value, and then when the driving member 36 drives the printing mechanism 3 to move from the position to be printed to the printing position, the printing position of the printing mechanism 3 can also ensure the position accuracy to ensure the printing quality.

[0064] It should be noted that the rotating shaft 22 can be directly rotatably supported by the first shell 111 and the second shell 121. Preferably, in this embodiment, the shell 1 further includes a first sleeve 41 disposed on the first shell 111 and a second sleeve 42 disposed on the second shell 112. Figure 2 , Fig.10 and Fig.11 The rotating shaft 22 passes through the first sleeve 41 and the second sleeve 42 in sequence to further ensure smooth rotation of the rotating shaft 22. The first housing 111 and the first sleeve 41, and the second housing 112 and the second sleeve 42 can be separately provided. Of course, the first housing 111 and the first sleeve 41, and the second housing 112 and the second sleeve 42 can also be integrally provided.

[0065] Optionally, along the rotation direction of the rotating shaft 22 and along the axial direction of the rotating shaft 22, the distances between each position on the first contact portion and the axis of the rotating shaft 22 are equal, so that the force transmitted from the printing mechanism 3 to the cam 21 is directed to the axis of the rotating shaft 22. In this arrangement, no matter the printing mechanism 3 moves along the radial direction of the cam 21 relative to the cam 21, or moves along the axial direction of the rotating shaft 22 relative to the cam 21, it can be ensured that the force applied by the printing mechanism 3 to the cam 21 is ultimately directed to the center of the rotating shaft 22, the rotating shaft 22 is not subjected to tangential force, and is not easy to loosen, so as to ensure that the cam 21 has a stable stopping effect on the printing mechanism 3.

[0066] Optionally, see Figure 3 The positioning mechanism 2 further includes a handle 23 fixed to one end of the rotating shaft 22. The operator can rotate the handle 23 to drive the rotating shaft 22 to rotate, so as to adjust the position of the cam 21 during the assembly process. Of course, in other embodiments, the rotating shaft 22 can also be driven to rotate by a servo motor, but compared with this solution, the provision of a servo motor will increase the cost.

[0067] Optionally, the rotating shaft 22 can rotate relative to the housing 1 and have a first position and a second position, the handle 23 can drive the rotating shaft 22 to switch between the first position and the second position, and the outer periphery of the cam 21 also has a second contact portion, and the second contact portion and the first contact portion have a smooth transition; when the rotating shaft 22 is in the first position, the second contact portion can abut against the printing mechanism 3 to limit the second distance value between the printing mechanism 3 and the printing roller 5, and the second distance value is greater than the first distance value; when the rotating shaft 22 is in the second position, the cam 21 is in a preset position, and the first contact portion abuts against the printing mechanism 3. In this embodiment, the printing mechanism 3 also has an initial position away from the printing roller 5, please refer to Fig. 9 When the printing mechanism 3 is in the initial position, the rotating shaft 22 is in the first position, the second contact portion abuts against the printing mechanism 3, and the print head 30 of the printing mechanism 3 is at a second distance from the printing roller 5, and the second distance value is greater than the first distance value. At this time, it is convenient to maintain the printing module, such as replacing the carbon ribbon roll. It should be noted that when the printing mechanism 3 is in the initial position, the first contact portion and the second contact portion can also be separated from the printing mechanism 3. At this time, it is more convenient to maintain the printing module. Figures 7 to 9 It can be seen that when the printing mechanism 3 is located at the printing position, the position to be printed and the initial position, the distance between the print head 30 and the print roller 5 increases successively. In this embodiment, the cam 21 is driven to rotate by the rotating shaft 22, so that the printing mechanism 3 can be moved from the initial position to the position to be printed, thereby realizing a first-level downward pressure on the printing mechanism 3. The printing mechanism 3 is driven to move from the position to be printed to the printing position by the driving member 36, thereby realizing a second-level downward pressure on the printing mechanism 3. The printing mechanism 3 can be driven to move from the printing position to the position to be printed and from the position to be printed to the initial position by the elastic element 37.

[0068] Optionally, when the rotating shaft 22 is located at the second position, the handle 23 can abut against the housing 1 to prevent the handle 23 from continuing to drive the rotating shaft 22 to rotate along the first direction. Such a setting can prevent the operator from turning the handle 23 at an excessive angle during assembly or debugging, resulting in the cam 21 being unable to accurately stop at the preset position. Specifically, in this embodiment, a limiting groove 111 is provided on the housing 1, and a plug 231 is convexly provided on the handle 23. The limiting groove 111 is arc-shaped, and the center line of the limiting groove 111 coincides with the center line of the rotating shaft 22. The limiting groove 111 has a first limiting surface 1111 and a second limiting surface 1112 located at both ends of the extending direction thereof. The plug 231 can be slidably inserted into the limiting groove 111; when the rotating shaft 22 is located at the first position, the plug 231 abuts against the first limiting surface 1111, and when the rotating shaft 22 is located at the second position, the plug 231 abuts against the second limiting surface 1112. In other embodiments, a plug post 231 may be provided on the shell 1, and a limiting groove 111 may be provided on the handle 23. Alternatively, a plug post 231 may be provided protrudingly on the shell 1, and there is no need to provide a limiting groove 111 on the handle 23. When the handle 23 drives the rotating shaft 22 to rotate to the second position, the side wall of the handle 23 abuts against the plug post 231.

[0069] Optionally, see Figure 2 , Fig.10 and Fig.11The printing module further includes a clamping member 24 disposed on the rotating shaft 22 and an elastic member 25 sleeved on the rotating shaft 22; the two ends of the elastic member 25 are respectively abutted against the housing 1 and the rotating shaft 22, and at least when the cam 21 is located at the preset position, the elastic member 25 has a tendency to drive the rotating shaft 22 to move along the axial direction of the rotating shaft 22, so that the clamping member 24 abuts against the housing 1. Specifically, the handle 23 and the clamping member 24 are respectively located on both sides of the housing 1, and the two ends of the elastic member 25 are respectively abutted against the first housing 11 and the handle 23. When the cam 21 is located at the preset position, driven by the elastic force of the elastic member 25, the clamping member 24 abuts against the second sleeve 42 on the second housing 12 to increase the friction resistance when the rotating shaft 22 rotates, thereby ensuring the stability of the position of the rotating shaft 22, so that the cam 21 is stably located at the preset position. In other embodiments, the clamping member 24 can also be configured to abut against the second housing 12. In this embodiment, the first sleeve 41 and the handle 23 cooperate to limit the relative position of the rotating shaft 22 and the first housing 111 along the axial direction of the rotating shaft 22, which can reduce the number of parts required to be assembled when the first housing 11 and the second housing 12 are assembled, and facilitate the improvement of assembly efficiency. The elastic member 25 is preferably a compression spring. At least when the rotating shaft 22 is in the second position, that is, when the cam 21 is in the set position, the compression spring is in a compressed state. The compression spring gives the rotating shaft 22 a certain axial preload, which can increase the friction force that the rotating shaft 22 needs to overcome when rotating. Therefore, when the printing mechanism 3 abuts against the cam 21, the cam 21 is less likely to drive the rotating shaft 22 to rotate, so as to ensure that the printing mechanism 3 can be accurately limited to the position to be printed. Preferably, the clamp 24 is a pin, which is detachably connected to the rotating shaft 22. Of course, the clamp 24 can also be set as a protruding structure integrated with the rotating shaft 22.

[0070] In this embodiment, the second sleeve 42 is provided with an axial hole 421 corresponding to the rotating shaft 22, and a avoidance hole 422 connected to the axial hole 421. When the first shell 11 and the second shell 12 are assembled, the end of the rotating shaft 22 passes through the second sleeve 42 from the axial hole 421, and at the same time, the clamp 24 passes through the second sleeve 42 along with the rotating shaft 22 from the avoidance hole 422. At this time, the rotating shaft 22 is located in the first position. When the handle 23 is rotated along the first direction, the rotating shaft 22 rotates, and the clamp 24 can correspondingly abut against the second sleeve 42 to achieve axial limitation of the rotating shaft 23.

[0071] Optionally, see Fig.10 and Fig.11The outer end surface of the second sleeve 42 of the housing 1 is provided with a guide slope 423, which extends along the circumferential direction of the second sleeve 42. The height of the guide slope 423 gradually increases along the first direction. The clamp 24 can abut against the guide slope 423. When the rotating shaft 22 switches from the first position to the second position, the elastic member 25 switches from the natural extension state to the compression state. With such a configuration, when the rotating shaft 23 is in the first position, the operator rotates the rotating shaft 22 along the first direction, and the compression spring can be gradually compressed, so that the preload force between the clamp 24 and the guide slope 423 will gradually increase, and the friction force that the rotating shaft 22 needs to overcome for rotation will also increase, which can prevent the rotating shaft 22 from loosening when it is in the second position to the greatest extent. In addition, when the operator turns the handle 23, he can feel the change in friction force, which has a good installation feel. Preferably, when the card 24 passes through the avoidance hole 422 and the shaft 22 is located in the first position, the compression spring is in a naturally extended state, and when the shaft 22 rotates along the first direction to the second position, the compression spring is gradually compressed. Such a setting facilitates the assembly of the first shell 111 and the second shell 121. In another embodiment, when the card 24 passes through the avoidance hole 422 and the shaft 22 is located in the first position, the compression spring is in a naturally extended state, and when the shaft 22 rotates along the first direction to the second position, the compression spring first maintains the naturally extended state unchanged and then is gradually compressed. In another embodiment, when the card 24 passes through the avoidance hole 422 and the shaft 22 is located in the first position, the compression spring can also be set to be in a compressed state. At this time, when assembling the first shell 11 and the second shell 12, it is necessary to overcome the elastic force of the compression spring.

[0072] Optionally, the outer end surface of the second sleeve 42 of the housing 1 is provided with a cam 424, and the clamp 24 can pass over the cam 424 as the shaft 22 rotates in the first direction, and when the cam 21 is located at the preset position, the clamp 24 can abut against the cam 424 in the second direction, and the second direction is opposite to the first direction. Specifically, the cam 424 is arranged on the guide ramp 423, and by setting the cam 424, when the shaft 22 rotates to the second position, if the shaft 22 is separated from the second position in the second direction, the clamp 24 needs to pass over the cam 424, so that the shaft 22 will need to overcome a greater friction force when rotating. Preferably, the number of the guide ramps 423 is two, and the two guide ramps 423 are symmetrically arranged about the axis center of the second sleeve 42, and the clamp 24 abuts against the two guide ramps 423 at the same time, so that the force on the clamp 24 can be balanced.

[0073] Optionally, a stop block 425 is provided on the outer end surface of the second sleeve 42 of the housing 1, and the stop block 425 is spaced apart from the clamping protrusion 424. When the cam 21 rotates to a preset position along the first direction with the rotating shaft 22, the clamping member 24 is located between the stop block 425 and the clamping protrusion 424. The stop block 425 can prevent the rotating shaft 22 from rotating from the first position to the second position along the first direction, so that the cam 21 cannot accurately stop at the position to be printed.

[0074] Optionally, the printing module further includes a detection member 6 disposed on the housing 1 or the second sleeve 42, and the detection member 6 is used to detect the position of the card member 24. Only when the cam 21 rotates to a preset position along the first direction with the rotating shaft 22, the detection member 6 cooperates with the card member 24, and the detection member 6 sends a first detection signal. When the detection member 6 sends the first detection signal, it indicates that the rotating shaft 22 has driven the cam 21 to rotate to the set position, the printing preparation has been completed, and printing can be performed at any time. It is understandable that when the rotating shaft 22 is out of the second position or the rotating shaft 22 has not yet rotated to the second position, the card member 24 is separated from the detection member 6, and the detection member 6 sends a second detection signal, indicating that the cam 21 has not yet reached the set position. Preferably, the detection member 6 sends the detection signal to the controller, and when the controller receives the first detection signal, the controller controls the power supply to supply power to the electrical components such as the print head 30; when the controller receives the second detection signal, the controller controls to cut off the electrical connection between the power supply and the print head 30. In this embodiment, the detection member 6 is a micro switch, and in other embodiments, the detection member 6 can also be replaced by a photoelectric sensor or the like.

[0075] Optionally, see Figure 5 , the printing mechanism 3 includes an adapter frame 31 and a bracket 32. The adapter frame 31 is provided with a connecting member 33 that can abut against the first contact portion, and the printing mechanism 3 is arranged on the adapter frame 31; the bracket 32 ​​is fixed to the first shell 11 of the housing 1, and the driving member 36 includes a body 361 and an output rod 362 that can be telescopic relative to the body 361. One of the body 361 and the output rod 362 is fixed to the adapter frame 31, and the other is fixed to the bracket 32. Specifically, in this embodiment, the body 361 of the driving member 36 is fixed to the adapter frame 31, and the output rod 362 is fixed to the bracket 32. In other embodiments, the body 361 of the driving member 36 can also be fixed to the bracket 32, and the output rod 362 can be fixed to the adapter frame 31. The elastic element 37 connects the bracket 32 ​​and the printing mechanism 3, and can also connect the first shell 111 and the printing mechanism 3. In this embodiment, the elastic element 37 is preferably a tension spring. In other embodiments, the tension spring can also be replaced by a compression spring. The printer includes a connecting pin 39 disposed on the bracket 32 ​​and a connecting shaft 38 disposed on the adapter frame 31, and two free ends of the tension spring are respectively fixed to the connecting pin 39 and the connecting shaft 38. The driving member 36 is preferably a cylinder. In other embodiments, the driving member 36 can also be replaced by an electric push rod or a hydraulic cylinder.

[0076] Optionally, the adapter frame 31 and the bracket 32 ​​are slidably connected via a sliding assembly, which includes a slider 35 disposed on the adapter frame 31 and a slide rail 34 disposed on the bracket 32 ​​, and the slider 35 is slidably disposed on the slide rail 34 .

[0077] Optionally, the connecting member 33 has a pressure-bearing surface that abuts against the cam 21, and the pressure-bearing surface is an arc surface or a spherical surface. With such an arrangement, the connecting member 33 and the cam 21 are in linear abutment or point contact, which can effectively reduce the friction between the two. In the present embodiment, the pressure-bearing surface adopts an arc surface. Preferably, the connecting member 33 includes a connecting rod 331 connected to the adapter 31, and a roller 332 rotatably arranged at one end of the connecting rod 331, and the outer peripheral surface of the roller 332 abuts against the cam 21. By setting the roller 332, there is rolling friction between the connecting member 33 and the cam 21, which can further reduce the friction between the two, avoid wear, and thus ensure the accuracy of the print head 30 when switching positions. In other implementations, the pressure-bearing surface may also be a plane.

[0078] Preferably, the cam 21 is made of nylon plus glass fiber material, which has a self-lubricating property and can reduce the friction between the connecting member 33 and the cam 21. Preferably, the roller 332 is made of nylon plus glass fiber material.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A printing module, comprising: Housing (1); A printing roller unit, comprising a printing roller (5) supported by the housing (1) and used for supporting a feeding recording medium (200); A limiting unit, comprising a positioning mechanism (2) supported on the housing (1); and A head unit, comprising a printing mechanism (3) supported by the housing (1) and having a printing head (30), and a driving mechanism, wherein the driving mechanism comprises a driving member (36) and an elastic member (37) both connected between the housing (1) and the printing mechanism (3), wherein the printing mechanism (3) is arranged between the printing roller unit and the limiting unit, wherein the printing mechanism (3) can be driven by the driving member (36) to approach the printing roller (5) to record the printed content on the recording medium (200), and the printing mechanism (3) can be driven by the elastic member (37) to move away from the printing roller (5) and abut against the positioning mechanism (2) to limit a first distance value between the printing mechanism (3) and the printing roller (5); Characterized in that the positioning mechanism (2) comprises: A rotating shaft (22) is rotatably supported on the housing (1), and the rotating shaft (22) can rotate relative to the housing (1) to have a first position and a second position; and A cam (21) is fixedly connected to the rotating shaft (22), and the outer periphery of the cam (21) has a first contact portion and a second contact portion, and the second contact portion smoothly transitions with the first contact portion; When the rotating shaft (22) is located at the second position, the cam (21) follows the rotating shaft (22) to rotate along the first direction to a preset position, and is able to abut against the printing mechanism (3) through the first contact portion to limit the first distance value; when the rotating shaft (22) is located at the first position, the first contact portion is separated from the printing mechanism (3), and the printing mechanism (3) is at a second distance value from the printing roller (5), and the second distance value is greater than the first distance value.

2. The printing module according to claim 1, characterized in that: Along the rotation direction of the rotating shaft (22) and along the axial direction of the rotating shaft (22), each position on the first contact portion is equidistant from the axis of the rotating shaft (22), so that the force transmitted to the cam (21) by the printing mechanism (3) is directed toward the axis of the rotating shaft (22).

3. The printing module according to claim 1, characterized in that: The printing module comprises a clamping member (24) arranged on the rotating shaft (22) and an elastic member (25) sleeved on the rotating shaft (22); The two ends of the elastic member (25) are respectively in contact with the housing (1) and the rotating shaft (22); at least when the cam (21) is located at the preset position, the elastic member (25) has a tendency to drive the rotating shaft (22) to move along the axial direction of the rotating shaft (22), so that the clamping member (24) is in contact with the housing (1).

4. The printing module according to claim 3, characterized in that: At least when the rotating shaft (22) is located at the second position, the elastic member (25) is in a compressed state.

5. The printing module according to claim 4, characterized in that: The outer end surface of the shell (1) is provided with a guide slope (423), the guide slope (423) extends along the circumferential direction of the rotating shaft (22), and the height of the guide slope (423) gradually increases along the first direction, the clamping member (24) can abut against the guide slope (423), and in the process of the rotating shaft (22) switching from the first position to the second position, the elastic member (25) switches from a naturally extended state to a compressed state.

6. The printing module according to claim 5, characterized in that: The number of the guide slopes (423) is two, and the two guide slopes (423) are symmetrically arranged about the axis center of the rotating shaft (22), and the clamping member (24) abuts against the two guide slopes (423) at the same time.

7. The printing module according to claim 4, characterized in that: The positioning mechanism (2) comprises a handle (23) fixedly mounted on one end of the rotating shaft (22); when the rotating shaft (22) is located at the second position, the handle (23) can abut against the housing (1) to prevent the handle (23) from continuing to drive the rotating shaft (22) to rotate along the first direction.

8. The printing module according to claim 7, characterized in that: One of the housing (1) and the handle (23) is provided with a limiting groove (111), and the other is provided with a plug post (231); the limiting groove (111) is arc-shaped, and the center line of the limiting groove (111) coincides with the center line of the rotating shaft (22); the limiting groove (111) has a first limiting surface (1111) and a second limiting surface (1112) located at two ends of the extending direction thereof; the plug post (231) can be slidably plugged into the limiting groove (111); When the rotating shaft (22) is located at the first position, the plug post (231) abuts against the first limiting surface (1111); when the rotating shaft (22) is located at the second position, the plug post (231) abuts against the second limiting surface (1112).

9. The printing module according to claim 7, characterized in that: The housing (1) is provided with a stop block (425); when the cam (21) rotates along the first direction with the rotating shaft (22) to the preset position, the stop block (425) abuts against the clamping member (24) to prevent the rotating shaft (22) from continuing to rotate along the first direction.

10. The printing module according to claim 8 or 9, characterized in that: The housing (1) is provided with a latching protrusion (424), and the latching member (24) can rotate along the first direction with the rotating shaft (22) to pass over the latching protrusion (424), and when the cam (21) is located at the preset position, the latching member (24) can abut against the latching protrusion (424) along a second direction, and the second direction is opposite to the first direction.

11. The printing module according to any one of claims 3 to 9, characterized in that: The printing module comprises a detection member (6) arranged on the housing (1), and the detection member (6) is used to detect the position of the card member (24). Only when the cam (21) rotates along the rotating shaft (22) along the first direction to the preset position, the detection member (6) cooperates with the card member (24) and the detection member (6) sends a first detection signal.

12. The printing module according to any one of claims 1 to 9, characterized in that: The printing mechanism (3) comprises: an adapter frame (31) on which a connecting piece (33) capable of abutting against the first contact portion is disposed, and the printing mechanism (3) is disposed on the adapter frame (31); and The bracket (32) is fixedly connected to the housing (1); the driving member (36) comprises a main body (361) and an output rod (362) which can be telescopic relative to the main body (361); one of the main body (361) and the output rod (362) is fixed to the adapter frame (31), and the other is fixed to the bracket (32).

13. A printer, characterized in that: Comprising the printing module described in any one of claims 1-12.

Images