Printer with automatic pressing down and lifting of print head and working method thereof

Abstract

The present invention discloses a printer with automatic pressing and lifting of a print head and a working method thereof, which comprises: a motor, a cam mechanism, a detection component, a transmission shaft, a print head module, a frame and a controller; the motor is fixed on the frame; the cam mechanism comprises a cam, a swinging member and an elastic connecting member, the cam is connected to the rotating shaft of the motor, the swinging body of the swinging member is connected to the print head module through the transmission shaft, one end is connected to the frame through the elastic connecting member, and the other end forms contact with the cam; the detection component comprises a detection sheet and a detection sensor, the detection sheet is fixed on the cam and forms at least two detection positions, the detection sensor is fixed on the frame and is configured to detect the detection positions; the controller is arranged in the frame and is electrically connected to the motor, the print head module and the detection sensor. The present invention realizes the automatic lifting and pressing of the print head, does not require manual operation, and improves the efficiency of printing.

Description

Technical Field

[0001] The invention relates to the field of printing, and in particular to a printer with a printing head that can be automatically pressed down and lifted up, and a working method thereof. Background Art

[0002] The printing materials of ordinary thermal transfer printers on the market are generally coated paper, synthetic paper, wash labels, wristbands, etc. The common characteristics of these materials are thin thickness, soft texture, flatness, and strong plasticity. The whole roll or stack of printing materials can be directly driven by the rubber roller to run continuously. The printing materials of ordinary thermal transfer printers are continuous. During normal printing, after the printed content is sent to the paper outlet, the user can directly remove, tear off or cut it with an automatic cutter without lifting the print head. After the whole roll or stack of printing materials is used up, it is necessary to manually lift the print head and replace the new printing material.

[0003] However, the above printing scheme is difficult to implement when printing card-type plastic. The reason is that the card-type material is an injection molding product made of PC, PA, etc., with a specific card-type structure. The thickness of the material is relatively thick, the surface is relatively hard, and the plasticity is poor. When printing, the card-type material can only go in and out directly, so it cannot be driven by the rotation of the rubber roller alone. It is necessary to design a tray that can accommodate the card-type material, and then use the transmission mechanism to drive the tray to do horizontal linear motion; when printing, the card-type plastic is placed in the tray, the print head is pressed down, the print head is pressed on the surface of the card-type plastic, and the tray is driven by the transmission system to move forward and out of the warehouse. After printing, the print head needs to be lifted, and a new card-type plastic needs to be replaced. The tray retreats into the warehouse, and then it is pressed down again to print; when the printing volume is relatively large, the print head is frequently pressed down and lifted up repeatedly by manual operation, which is not only time-consuming and labor-intensive, but also inefficient. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a printer with automatic pressing down and lifting of a print head and a working method thereof, so as to improve the above-mentioned problem.

[0005] The embodiment of the present invention provides a printer with a print head that can be automatically pressed down and lifted, which includes: a motor, a cam mechanism, a detection component, a transmission shaft, a print head module, a frame and a controller; wherein:

[0006] The motor is fixed on the frame;

[0007] The cam mechanism comprises a cam, a swinging member and an elastic connecting member, wherein the cam is connected to the rotating shaft of the motor, the swinging member is connected to the print head module through a transmission shaft, one end of the swinging member is connected to the frame through the elastic connecting member, and the other end is in contact with the cam;

[0008] The detection assembly includes a detection piece and a detection sensor, wherein the detection piece is fixed on the cam and is formed with at least two detection positions, and the detection sensor is fixed on the frame and is configured to detect the detection positions;

[0009] The controller is arranged in the frame and is electrically connected to the motor, the print head module and the detection sensor; the controller is configured to control the rotation direction and working state of the motor according to the detection result of the detection sensor to realize automatic pressing down and lifting of the print head module.

[0010] Preferably, the detection structure is a notch arranged on the outer periphery of the detection piece, the detection position is the upper edge and the lower edge of the notch, and the detection sensor is configured to face the outer periphery of the detection piece; or, the detection structure is a protruding structure arranged on the outer periphery of the detection piece, the detection position is the upper edge and the lower edge of the protruding structure, and the detection sensor is configured to face the outer periphery of the detection piece.

[0011] Preferably, the print head module comprises a rotating shaft, one end of the transmission shaft is connected to the end of the rotating shaft, and the other end is connected to the swing body of the swinging member.

[0012] Preferably, it also includes a tray for accommodating pallet-type plastics, and the tray is detachably connected to the frame; the tray includes a bottom plate and a cushion, and the cushion is attached to the bottom plate, and a slot structure for accommodating pallet-type plastics is provided on the cushion.

[0013] Preferably, the bottom plate is made of aluminum alloy, stainless steel or hard plastic; and the soft cushion is made of silicone or foam.

[0014] Preferably, a pressure line of the pressure of the swinging member on the cam passes through the center of the working profile of the cam.

[0015] Preferably, the working profile of the cam is obtained by the following method:

[0016] Set the rotation center O of the cam, the minimum radial diameter rb, the maximum radial diameter rm of the cam working profile, and the two extreme positions A and H of the working profile, where A is the proximal extreme position and H is the distal extreme position;

[0017] Generate a first circle with point O as the center and a preset R1 as the radius, and select several centers on the first circle, draw circles with each center, and make adjacent circles tangent to each other, with each tangent point distributed in the same direction;

[0018] Draw a circle with point O as the center and rm as the radius;

[0019] Make a smooth transition curve HIA; I is the transition point;

[0020] The working profile of the cam is obtained by drawing a curve according to A, H and each tangent point, and the cam is designed and manufactured according to the working profile.

[0021] Preferably, the several circle centers are six equally divided points of the first circle, namely point a, point b, point c, point d, point e, and point f; then the first circle is generated with point O as the center and R1 as the radius, and several circle centers are selected on the first circle, and circles are drawn with each center, and adjacent circles are tangent, and a circle is drawn with point O as the center and rm as the radius, and the formed working profile is specifically:

[0022] Draw a circle with point a as the center and rb as the radius, and draw a circle with point b as the center, which is tangent to circle a, and the tangent point is point B;

[0023] Draw a circle c with point c as the center and tangent to circle b, with the tangent point being point C;

[0024] Draw a circle d with point d as the center, which is tangent to circle c, and the point of tangency is point D;

[0025] Draw a circle e with point e as the center, which is tangent to circle d, and the point of tangency is point E;

[0026] Draw a circle f with point O as the center and rm as the radius; if circle f and circle e are not tangent, add a transition curve GF, and curve GH is an arc on circle f;

[0027] The working profile is obtained according to the curve ABCDEFGH.

[0028] The embodiment of the present invention further provides a method for operating the printer as described above, comprising:

[0029] When it is detected that the first detection position of the detection sheet exceeds the detection range of the detection sensor, it is determined that the print head module is in a lifted state. At this time, the cam pushes the swing member to the far end, the elastic connecting member is tightened, and the pressure of the swing member on the cam is the greatest;

[0030] When receiving a command to press down the print head module, the motor is controlled to drive the cam and the detection sheet to rotate in a first direction until the second detection position of the detection sheet exceeds the detection range of the detection sensor, and the motor is controlled to stop rotating. At this time, the print head module is in a downward pressure state, the elastic connecting member is relaxed, and the tension of the elastic connecting member is converted into a downward pressure of the print head;

[0031] When receiving the instruction to lift the print head module, the control motor drives the cam and the detection sheet to rotate along the second direction until the first detection position of the detection sheet exceeds the detection range of the detection sensor, and the print head module is in the lifted state.

[0032] Preferably, the method includes: performing a print head reset action when the printer is restarted to determine whether there is any abnormal lifting of the print head.

[0033] This embodiment controls the rotation and stopping of the motor through the detection component, and then controls the automatic lifting and pressing down of the print head on the print head module through the cam mechanism and the transmission shaft. No manual operation is required, which greatly improves the printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a schematic structural diagram of a printer with automatic pressing down and lifting of a print head provided by a first embodiment of the present invention.

[0036] Figure 2 It is a schematic diagram of the connection between the motor, the cam mechanism and the detection component provided in the first embodiment of the present invention.

[0037] Figure 3 It is a structural schematic diagram of a print head assembly provided by an embodiment of the present invention in a raised state.

[0038] Figure 4 It is a structural schematic diagram of a print head assembly provided by an embodiment of the present invention in a pressed down state.

[0039] Figure 5 It is a schematic diagram of generating the working profile of the cam provided by an embodiment of the present invention.

[0040] Figure 6 It is a schematic structural diagram of a tray provided in one embodiment of the present invention.

[0041] Figure 7 It is a flowchart of a working method of a printer with automatic pressing down and lifting of a print head provided by a second embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0043] See also Figure 1 and Figure 2 The embodiment of the present invention provides a printer with automatic pressing down and lifting of a print head, which comprises: a motor 10, a cam mechanism, a detection component, a transmission shaft 40, a print head module 50, a frame and a controller; wherein:

[0044] The motor 10 is fixed on the frame;

[0045] The cam mechanism includes a cam 21, a swinging member 22 and an elastic connecting member 23. The cam 21 is connected to the rotating shaft of the motor 10. The swinging member 22 is connected to the print head module 50 through a transmission shaft 40, one end of which is connected to the frame through the elastic connecting member 23, and the other end is in contact with the cam 21.

[0046] The detection assembly includes a detection piece 31 and a detection sensor 32. The detection piece 31 is fixed on the cam 21 and has at least two detection positions. The detection sensor 32 is fixed on the frame and is configured to detect the detection positions.

[0047] The controller is arranged in the frame and is electrically connected to the motor 10, the print head module 50 and the detection sensor 32; the controller is configured to control the rotation direction and working state of the motor 10 according to the detection result of the detection sensor 32, so as to realize the automatic pressing down and lifting of the print head module 50 through the cam mechanism.

[0048] In this embodiment, the frame can be a shell of the printer, which provides a storage space to accommodate various modules of the printer and plays a role in fixing various modules. The shape and structure of the frame can be set according to actual needs, and the present invention does not make specific limitations.

[0049] In this embodiment, the cam 21 is a mechanism with a curved profile. The cam 21 is fixed to the shaft of the motor 10 and can rotate along with the shaft when the shaft rotates, thereby driving the swing member 22 to move.

[0050] Among them, it is particularly difficult that, in this embodiment, the cam 22 is a disc cam, and the swing member 22 is a flat-bottom swinging push rod. However, in other embodiments of the present invention, the cam 22 can also be a cylindrical cam, and the swing member 22 can also be a pointed push rod, a roller push rod, etc., all of which are within the protection scope of the present invention.

[0051] In this embodiment, the elastic connecting member 23 may be a spring, a tension spring or a compression spring, etc., which is not specifically limited in the present invention.

[0052] In this embodiment, the two detection positions of the detection sheet 31 correspond to the lifting and pressing states of the print head module 50 respectively. The detection sensor 32 can determine whether the print head module 50 is in the lifting state or the pressing state according to the detected detection positions, thereby controlling the next operation of the printer.

[0053] In this embodiment, for example, the detection sheet 31 is formed with a notch 311 on its outer periphery, and the notch 311 has an upper edge 312 and a lower edge 313. The detection sensor 32 can be based on the principle of infrared detection or Hall detection to determine whether it passes through the upper edge 312 and the lower edge 313, thereby realizing the detection of the detection position.

[0054] It should be noted that in other embodiments of the present invention, the detection structure of the detection sheet 31 may also adopt other structures, such as forming a protruding structure on the outer periphery, and forming two detection positions through the upper and lower edges of the protruding structure. These schemes are all within the protection scope of the present invention.

[0055] In this embodiment, the print head module 50 includes a rotating shaft 51 and a print head 52 . One end of the transmission shaft 40 is connected to the end of the rotating shaft 51 , and the other end is connected to the swinging body of the swinging member 22 .

[0056] The specific working principle of this embodiment is described in detail below.

[0057] like Figure 3 As shown, assuming that the print head module 50 is initially in a raised state, the upper edge 312 of the notch 311 of the detection sheet 31 is beyond the detection range of the detection sensor 32, and at the same time the cam 21 pushes the swing member 22 to the far end, the elastic connecting member 23 is tightened, and the pressure of the swing member 22 on the cam 21 is maximum.

[0058] When the print head 52 of the print head module 50 is ready to be pressed down to perform printing, the motor 10 drives the cam 21 and the detection plate 31 to rotate in a first direction (e.g., counterclockwise, the rotation direction is related to the design of the cam mechanism), and the rotation stops when the lower edge 312 of the notch 311 of the detection plate 31 exceeds the detection range of the detection sensor 32 (e.g., counterclockwise). Figure 4 ), at this time, the print head module 50 is in a downward pressure state, the elastic connecting member 23 is relaxed, and the pulling force of the elastic connecting member 23 is completely converted into a downward pressure of the print head 52 of the print head module 50, pressing on the card-type plastic surface, and then printing begins. After printing is completed, the print head 52 of the print head module 50 begins to rise again, and the motor 10 drives the cam 21 and the detection plate 31 to rotate in a second direction (e.g., clockwise, opposite to the first direction of rotation), and returns to the state as shown in the figure. Figure 3When printing is ready, the motor 21 drives the cam 22 and the detection plate 31 to rotate counterclockwise again to the position shown in FIG. Figure 4 When the print head module 50 needs to be reset, that is, the print head module 50 needs to be returned to the raised state, the motor 21 drives the cam 22 and the detection piece 31 clockwise to move to the position shown in FIG. Figure 3 Stop at the indicated position.

[0059] In summary, this embodiment controls the rotation and stopping of the motor 10 through the detection component, and then controls the automatic lifting and pressing down of the print head on the print head module 50 through the cam mechanism and the transmission shaft 40, without manual operation, which greatly improves the printing efficiency.

[0060] Some preferred embodiments of the present invention are further described below.

[0061] In the above embodiment, when the pressure range of the swing member 22 on the cam 21 is certain, the smaller the force arm of the pressure of the swing member 22 on the cam 21, the smaller the torque of the swing member 22 on the cam 21, and the lower the operating torque requirement of the motor 10.

[0062] To this end, in this embodiment, when the print head module 50 is in a raised state, the pressure line of the swing member 22 on the cam 21 passes through the center of the working contour of the cam 21, so that effective self-locking can be achieved. In theory, no matter how large the pulling force of the elastic connecting member 23 is, the swing member 22 will not be pulled back, thereby stably ensuring that the print head 52 is in a raised state.

[0063] Among them, Figure 5 As shown, the working profile of the cam 21 can be obtained by the following method:

[0064] First, set the rotation center O of the cam, the minimum radial diameter rb, the maximum radial diameter rm of the cam working profile, and the two extreme positions A and H of the working profile, where A is the proximal extreme position and H is the distal extreme position.

[0065] Then, a first circle is generated with point O as the center and a preset R1 as the radius, and several centers are selected on the first circle, and circles are drawn with each center, and adjacent circles are made tangent, and each tangent point is distributed in the same direction.

[0066] In this embodiment, the radius R1 of the first circle can be adjusted as needed. The selection of the centers of the several circles can be on the first circle or inside the first circle, including the axis point O. The best is to select on the first circle; the best points selected on the first circle are equally divided points, and the number of equally divided points depends on the actual situation. Non-equally divided points are also possible. These solutions are all within the protection scope of the present invention.

[0067] For example, in a specific implementation, six equally divided points a, b, c, d, e, and f are selected on the first circle as the center of the circle, then:

[0068] Draw a circle with point a as the center and rb as the radius, and draw a circle with point b as the center, which is tangent to circle a, and the tangent point is point B;

[0069] Draw a circle c with point c as the center and tangent to circle b, with point C as the tangent point;

[0070] Draw a circle d with point d as the center, which is tangent to circle c, and the point of tangency is point D;

[0071] Draw a circle e with point e as the center, which is tangent to circle d, and the point of tangency is point E;

[0072] Next, draw a circle f with point O as the center and rm as the radius; if circle f and circle e are not tangent, add a transition curve GF, and curve GH is an arc on circle f;

[0073] Next, make a smooth transition curve HIA, where I is the newly added transition point;

[0074] Here, the smooth transition curve HIA only needs to be a smooth transition curve, and its curve shape is not specifically limited.

[0075] Finally, the working profile of the cam is obtained according to the curve ABCDEFGH, and the cam is designed and manufactured according to the working profile.

[0076] Among them, the working profile of the cam can be designed as follows Figure 5 The clockwise curve ABCDEFGH shown can also be designed as a counterclockwise curve ABCDEFGH, and these solutions are within the protection scope of the present invention.

[0077] In this embodiment, the working profile of the cam set in this way can ensure that the pressure line passes through the rotation center O of the cam 21 when the swing member 22 contacts the cam 21 in the profile segment BH, thereby achieving effective self-locking.

[0078] Preferably, if Figure 6 As shown, it also includes a tray 70 for accommodating the pallet-type plastic 200, and the tray 70 is detachably connected to the frame; the tray 70 includes a bottom plate 71 and a soft pad 72, and the soft pad 72 is attached to the bottom plate 71, and a slot structure that can accommodate the pallet-type plastic is provided on the soft pad 72.

[0079] The bottom plate 71 may be made of metal materials such as aluminum alloy, stainless steel, or relatively hard plastic, and the soft pad 72 may be made of soft materials such as silica gel or foam.

[0080] See also Figure 7 The second embodiment of the present invention further provides a method for operating the printer as described above, which comprises:

[0081] S201, when it is detected that the first detection position of the detection sheet exceeds the detection range of the detection sensor, it is determined that the print head module is in a lifted state, at which time the cam pushes the swing member to the far end, the elastic connecting member is tightened, and the pressure of the swing member on the cam is maximum;

[0082] S202, when receiving a command to press the print head module downward, controlling the motor to drive the cam and the detection sheet to rotate in a first direction until the second detection position of the detection sheet exceeds the detection range of the detection sensor, and then controlling the motor to stop rotating. At this time, the print head module is in a downward pressure state, the elastic connecting member is relaxed, and the tension of the elastic connecting member is completely converted into downward pressure of the print head;

[0083] S203, when receiving the instruction to lift the print head module, the control motor drives the cam and the detection plate to rotate along the second direction until the first detection position of the detection plate exceeds the detection range of the detection sensor, and the print head module is in a lifted state.

[0084] Preferably, the method includes: performing a print head reset action when the printer is restarted to determine whether there is any abnormal lifting of the print head.

[0085] Specifically, each time the print head module 50 is pressed down and lifted up, the first detection position and the second detection position of the detection sheet 31 are beyond the detection range of the detection sensor 32, so when the printer is restarted, a print head 52 reset action is required to determine whether the print head 52 is lifted abnormally.

[0086] In one implementation, the relative position of the notch of the detection sheet 31 and the detection sensor 32 can be used to determine when the print head 52 is lifted and pressed down. For example, when the detection sheet 31 rotates in the second direction (clockwise), the detection signal of the pressed state is blocked and disappears for a short time ( Figure 4 ), while the lift-up state detection signal takes a relatively long time to be blocked and disappear ( Figure 3 ), and judged according to the time difference between the two. If it is judged that the print head is lifted normally, that is, the signal has not disappeared after exceeding the specified time, the control motor rotates in the reverse direction to return to the position; if it is judged that the print head is lifted abnormally, the control motor continues to rotate in the second direction after the signal disappears until the detection sensor 32 receives a signal again.

[0087] In another implementation, no matter the print head 52 is lifted or pressed down, the motor 10 is controlled to drive the cam 21 and the detection plate 31 to rotate along the second direction until the detection sensor 32 stops when it receives a signal again after the signal disappears.

[0088] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A printer with a print head that can be automatically pressed down and lifted, characterized in that: include: Motor, cam mechanism, detection assembly, transmission shaft, print head module, frame and controller; wherein: The motor is fixed on the frame; The cam mechanism comprises a cam, a swinging member and an elastic connecting member, wherein the cam is connected to the rotating shaft of the motor, the swinging body of the swinging member is connected to the print head module through a transmission shaft, one end of the swinging member is connected to the frame through the elastic connecting member, and the other end is in contact with the cam; wherein the pressure line of the pressure of the swinging member on the cam passes through the center of the working profile of the cam, so as to realize effective self-locking of the swinging member; The detection assembly includes a detection piece and a detection sensor, wherein the detection piece is fixed on the cam and has at least two detection positions, and the detection sensor is fixed on the frame and is configured to detect the detection positions; The controller is arranged in the frame and is electrically connected to the motor, the print head module and the detection sensor; the controller is configured to control the rotation direction and working state of the motor according to the detection result of the detection sensor, so as to control the automatic pressing down and lifting of the print head module through the cam mechanism.

2. The printer with automatic pressing down and lifting of the print head according to claim 1, characterized in that: The detection component is a notch arranged at the outer periphery of the detection piece, the detection position is the upper edge and the lower edge of the notch, and the detection sensor is configured to face the outer periphery of the detection piece; or, the detection component is a protruding structure arranged at the outer periphery of the detection piece, the detection position is the upper edge and the lower edge of the protruding structure, and the detection sensor is configured to face the outer periphery of the detection piece.

3. The printer with automatic pressing down and lifting of the print head according to claim 1, characterized in that: The print head module comprises a rotating shaft, one end of the transmission shaft is connected to the end of the rotating shaft, and the other end is connected to the swing body of the swinging member.

4. The printer with automatic pressing down and lifting of the print head according to claim 1, characterized in that: It also includes a tray for accommodating pallet-type plastics, which is detachably connected to the frame; the tray includes a bottom plate and a soft pad, which is attached to the bottom plate and is provided with a groove structure for accommodating pallet-type plastics.

5. The printer with automatic pressing down and lifting of the print head according to claim 4, characterized in that: The bottom plate is made of aluminum alloy, stainless steel or hard plastic; the soft cushion is made of silica gel or foam.

6. The printer with automatic pressing down and lifting of the print head according to claim 1, characterized in that: The working profile of the cam is obtained by the following method: Set the rotation center O of the cam, the minimum radial diameter rb, the maximum radial diameter rm of the cam working profile, and the two extreme positions A and H of the working profile, where A is the proximal extreme position and H is the distal extreme position; Generate a first circle with point O as the center and a preset R1 as the radius, and select several centers on the first circle, draw circles with each center, and make adjacent circles tangent to each other, with each tangent point distributed in the same direction; Draw a circle with point O as the center and rm as the radius; Make a smooth transition curve HIA; I is the transition point; The working profile of the cam is obtained by drawing a curve according to A, H and each tangent point, and the cam is designed and manufactured according to the working profile.

7. The printer with automatic pressing down and lifting of the print head according to claim 6, characterized in that: The centers of the several circles are six equally divided points of the first circle, namely point a, point b, point c, point d, point e, and point f; then the first circle is generated with point O as the center and R1 as the radius, and several centers are selected on the first circle, and circles are drawn with each center, and adjacent circles are tangent, and a circle is drawn with point O as the center and rm as the radius. The specific working profile formed is: Draw a circle with point a as the center and rb as the radius, and draw a circle with point b as the center, which is tangent to circle a, and the tangent point is point B; Draw a circle c with point c as the center and tangent to circle b, with point C as the tangent point; Draw a circle d with point d as the center, which is tangent to circle c, and the point of tangency is point D; Draw a circle e with point e as the center, which is tangent to circle d, and the point of tangency is point E; Draw a circle f with point O as the center and rm as the radius; if the circle f and the circle e are not tangent, add a transition curve GF, and the curve GH is an arc on the circle f; The working profile is obtained according to the curve ABCDEFGH.

8. A method for operating a printer according to any one of claims 1 to 7, characterized in that: include: When it is detected that the first detection position of the detection sheet exceeds the detection range of the detection sensor, it is determined that the print head module is in a lifted state. At this time, the cam pushes the swing member to the far end, the elastic connecting member is tightened, and the pressure of the swing member on the cam is the greatest; When receiving a command for pressing down the print head of the print head module, the motor is controlled to drive the cam and the detection sheet to rotate in a first direction until the second detection position of the detection sheet exceeds the detection range of the detection sensor, and the motor is controlled to stop rotating. At this time, the print head module is in a downward pressure state, the elastic connecting member is relaxed, and the tension of the elastic connecting member is converted into downward pressure of the print head; When receiving a command to lift the print head of the print head module, the control motor drives the cam and the detection plate to rotate along the second direction until the first detection position of the detection plate exceeds the detection range of the detection sensor, and the print head module is in a lifted state.

9. The operating method of the printer according to claim 8, characterized in that: include: When the printer is restarted, a print head reset action is performed to determine if there is any abnormal lift of the print head.

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