3D printing device with cutting function and cutting method

Abstract

The invention relates to a 3D printing device with a cutting function and a cutting method. The printing device comprises a printing head and a cutting mechanism which can move relatively, and a cutting knife is arranged on the cutting mechanism; and during cutting, the printing head and the cutting mechanism or the cutting knife move relatively, so that the cutting knife cuts off the printing material on the printing head. The cutting mechanism does not need to be arranged on the printing head, the mass of the printing head is reduced, the structure of the printing head is simplified, or the number of wires connected to the printing head is reduced, the high-speed dynamic moving speed and the positioning precision of the printing head can be improved, the printing speed and the printing precision can be improved, and the cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and specifically to a 3D printing device and cutting method with cutting function. Background Technology

[0002] 3D printing is a process that constructs objects by printing layer by layer based on digital model files. One such process is Fused Filament Fabrication (FFF) or Fused Deposition Modeling (FDM). According to the layer pattern information in the digital model file, the nozzle moves relative to the platform in the XY plane. While the nozzle moves above the platform, it extrudes the flowable printing material along the printing path at an appropriate speed until one layer is printed. After one layer is printed, the print head and the printing platform move away from each other by a certain distance, such as the layer thickness, and then a new layer is printed. This process is repeated layer by layer until a three-dimensional solid is formed.

[0003] Printing materials may need to be cut. Current technologies typically incorporate a cutter on the print head to cut the material when necessary, or the material can be manually cut, for example, when replacing the material or the print head. However, adding a cutter to the print head increases its weight and structural complexity. A lighter print head improves dynamic movement and positioning accuracy, ultimately leading to faster and more accurate printing. Manually cutting the material is inefficient, provides a poor user experience, and can easily damage the print head if done improperly. Therefore, improvements to existing cutting methods are necessary. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a 3D printing device and cutting method with cutting function. This invention solves the problems of existing cutters being placed on the print head, increasing the weight and structural complexity of the print head, or the poor user experience of manually cutting printing materials. It can achieve a simple structure and low cost, as well as reliable cutting of printing materials.

[0005] The technical solution to achieve the above objectives is:

[0006] The present invention provides a 3D printing device with cutting function, including a print head and a cutting mechanism that can move relative to each other, wherein the cutting mechanism is provided with a cutting blade;

[0007] During cutting, the relative movement between the print head and the cutting mechanism or the cutting blade causes the cutting blade to cut the printed material on the print head.

[0008] The present invention also provides a cutting method for a 3D printing device with cutting function, comprising the following steps:

[0009] When the printhead needs to cut the printing material, move the printhead to the cutting position of the cutting mechanism or move the cutting blade of the cutting mechanism to the cutting position of the printhead.

[0010] The print head moves relative to or towards the cutting mechanism or the cutting blade on the cutting mechanism, and the cutting blade cuts the printed material.

[0011] The potential benefits of the 3D printing device and cutting method with cutting function of the present invention are as follows: The cutting mechanism of the present invention does not need to be set on the print head, reducing the weight of the print head, simplifying the print head structure, or reducing the number of wire connections on the print head, which is conducive to improving the high-speed dynamic movement speed and positioning accuracy of the print head, improving printing speed and printing accuracy, and also reducing costs. Alternatively, the cutting mechanism and cutting process of the present invention are very simple and reliable in use; or the rapid movement capability of the print head can be cleverly utilized, for example, by moving the print head to the cutting blade of the cutting mechanism for cutting. In most cases, no power drive mechanism needs to be set on the cutting blade, and the cutting action can be completed solely by the movement of the print head, which is simple and reliable. Alternatively, the present invention can also set a power drive mechanism on the cutting device when necessary (such as when the cutting blade is made of continuous fiber or metal wire printing material, or to increase the printable area size of the print head, or to further improve the cutting speed), which can further improve the flexibility of application or the convenience of the cutting process. Moreover, the setting space or setting method of the power drive mechanism has a high degree of freedom, and it does not need to consider the weight or volume constraints of components on the print head, which is conducive to improving reliability and durability. Attached Figure Description

[0012] Figure 1a This is a schematic diagram of the print head and cutting mechanism of a 3D printing device with cutting function according to the present invention.

[0013] Figure 1b This is an exploded view of a cutting mechanism with a protective structure according to the present invention.

[0014] Figure 1c This is a schematic diagram of the structure of a hot end according to the present invention.

[0015] Figure 2a This is a schematic diagram of the structure of the 3D printing head of the 3D printing device with cutting function of the present invention, which can move along the XY plane.

[0016] Figure 2b This is a schematic diagram showing the 3D printing head of the present invention moving to the cutting blade of the cutting mechanism and the printing material being cut off.

[0017] Figure 2c This is a schematic diagram of the cutting blade of the 3D printing head removal cutting mechanism of the present invention.

[0018] Figure 2d This is a schematic diagram of another hot end structure of the present invention.

[0019] Figure 3a This is a schematic diagram of a 3D printing device with a swingable protective structure for the cutting mechanism of the present invention.

[0020] Figure 3b This is a schematic diagram of a 3D printing device of the present invention, in which the print head moves to the cutting mechanism and pushes open the protective structure to allow the cutting blade to cut the printing material.

[0021] Figure 3c This is a schematic diagram of another 3D printing device according to the present invention, in which the print head moves to the cutting mechanism and pushes open the protective structure to allow the cutting blade to cut the printing material.

[0022] Figure 4 This is a schematic diagram of a 3D printing device in which the protective structure of the cutting mechanism of the present invention can be opened or closed by a drive mechanism.

[0023] Figure 5a This is a schematic diagram of a 3D printing device in which the cutting blade of the cutting mechanism of the present invention can swing around an axis, so that the cutting edge of the cutting blade can cut the printing material on the print head from different directions.

[0024] Figure 5b This is a schematic diagram of the 3D printing device of the present invention, showing the print head moving to the cutting mechanism.

[0025] Figure 5c This is a schematic diagram of a 3D printing device in which the print head of the present invention pushes a swingable cutting blade in one direction while the cutting blade cuts the printing material in another direction.

[0026] Figure 5d This is a schematic diagram of a 3D printing device where the cutting blade of the cutting mechanism of the present invention can swing around an axis to increase the cutting edge and the relative movement distance of the print head.

[0027] Figure 5e This is a schematic diagram of a 3D printing device in which the cutting blade of the cutting mechanism of the present invention cuts the printing material.

[0028] Figure 5f This is a schematic diagram of a 3D printing device in which the cutting blade of the cutting mechanism of the present invention is pushed and oscillated by a pusher with an inclined surface on the print head.

[0029] Figure 5g A schematic diagram of a 3D printing device in which two cutting blades are set up to form a cutting method similar to scissors for the cutting mechanism of the present invention.

[0030] Figure 6a A schematic diagram of a 3D printing device with a gear and rack transmission mechanism for the cutting mechanism of the present invention.

[0031] Figure 6b A schematic diagram of a 3D printing device for which a gear and rack transmission mechanism, a housing, and a buffer mechanism are provided for the cutting mechanism of the present invention.

[0032] Figure 6c A schematic diagram of a 3D printing device with a rack and pinion transmission mechanism having two pinions for the cutting mechanism of the present invention.

[0033] Figure 6d for Figure 6c The diagram shows the 3D printing device in the cutting state.

[0034] Figure 6e A schematic diagram of a 3D printing device with a synchronous belt drive mechanism for the cutting mechanism of the present invention.

[0035] Figure 6f A schematic diagram of a 3D printing device for setting a rack and pinion transmission mechanism for the cutting mechanism of the present invention.

[0036] Figure 7a This is a schematic diagram of a 3D printing device in which the cutting mechanism of the present invention drives the cutting blade to move via a drive mechanism.

[0037] Figure 7b This is a schematic diagram of a 3D printing device in which the cutting mechanism of the present invention can drive the cutting blade to move to the notch of the print head to cut the printing material.

[0038] Figure 7c This is a schematic diagram illustrating how the cutting mechanism of the present invention can adjust the cutting blade to the working state via a switching mechanism.

[0039] Figure 7d This is a schematic diagram of the cutting mechanism of the present invention, which can adjust the cutting blade to the retracted state through a switching mechanism.

[0040] Figure 8 This is a schematic diagram of a 3D printing device of the present invention, in which the print head is mounted on a swing arm and the cutting blade is driven by a drive mechanism to swing.

[0041] Figure 9a This is a schematic diagram of a 3D printing device of the present invention, in which the cutting blade is moved to the print head by an actuator for cutting.

[0042] Figure 9b This is a schematic diagram of a 3D printing device of the present invention, in which the cutting blade is driven by an actuator to move to the print head and can be pushed and oscillated by the pushing part on the print head.

[0043] Figure 9c This is a schematic diagram of a 3D printing device in which the cutting blade of the present invention is driven by a translational and oscillating actuator to move to the print head for cutting.

[0044] Figure 9d This is a schematic diagram of a 3D printing device in which the cutting blade of the present invention is driven by another translational and swinging actuator to move to the print head for cutting. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0046] This invention provides a 3D printing device and method with a cutting function, addressing the problem in existing technologies where placing the cutter on the print head increases its weight and structural complexity, thus affecting its movement performance and positioning accuracy. It also solves the problems of low efficiency, poor user experience, and easy scratching or damage to the print head caused by manual cutting of printing material in existing technologies. In this invention, the print head and cutting mechanism are two independent components that can move relative to each other. This relative movement cuts the printing material on the print head. Thus, the cutting mechanism is not located on the print head, reducing its weight, improving its high-speed dynamic movement and positioning accuracy, thereby increasing printing speed and precision, and reducing costs. The 3D printing device and cutting method with a cutting function of this invention will be described below with reference to the accompanying drawings.

[0047] Example 1, as Figures 1a to 2c As shown, the 3D printing device with cutting function of the present invention includes a print head 20 and a cutting mechanism 50, which can move relative to each other; a cutting blade 51 is provided on the cutting mechanism 50; during cutting, the print head 20 and the cutting mechanism 50 or the cutting blade 51 move relative to each other, so that the cutting blade 51 cuts the printing material 23 on the print head 20. The relative movement includes print head movement, cutting mechanism or cutting blade movement, or print head and cutting mechanism or cutting blade movement at the same time.

[0048] Furthermore, the printhead 20 is provided with a hot end 10, which includes an extrusion port 11 and a feeding line for conveying printing material 23 to the extrusion port 11. A notch 24 is provided in the feeding line for conveying the printing material 23 to the hot end 10 to expose the printing material 23, so that the cutting blade 51 can cut off the printing material 23 at the notch 24 during cutting. The feeding line may include a feeding tube 21, which conveys the printing material 23 to the printhead 20 and then to the extrusion port 11 via the feeding line on the printhead.

[0049] The relative opposing movements of the print head 20 and the cutting mechanism 50 or the cutting blade 51 include the movement of the print head 20, the movement of the cutting mechanism 50 or the cutting blade 51, or the simultaneous movement of the print head 20, the cutting mechanism 50, and the cutting blade 51. Specifically, during cutting, the print head 20 moves to the cutting position of the cutting mechanism 50, and the print head 20 moves toward the cutting blade 51 of the cutting mechanism 50, so that the cutting blade 51 cuts the printing material 23 at the notch 24; or during cutting, the print head 20 moves to the cutting position of the cutting mechanism 50, and the cutting mechanism 50 or the cutting blade 51 moves toward the print head, so that the cutting blade 51 cuts the printing material 23 at the notch 24; or during cutting, the cutting blade 51 of the cutting mechanism 50 moves to the cutting position of the print head 20, and the print head 20 moves toward the cutting blade 51, so that the cutting blade 51 cuts the printing material 23 at the notch 24; or during cutting, the cutting blade 51 of the cutting mechanism 50 moves to the cutting position of the print head 20, and the cutting mechanism 50 or the cutting blade 51 moves toward the print head, so that the cutting blade 51 cuts the printing material 23 at the notch 24.

[0050] In this invention, the movement or motion of the print head and the cutting blade or cutting mechanism toward each other refers to the cutting blade moving or moving toward the notch of the print head and / or the print head moving or moving toward the blade edge of the cutting blade. The aforementioned movement or motion can be linear translation, oscillation, or movement along a curve. The various embodiments of this invention can be combined with each other according to application needs.

[0051] Figures 1a to 2c As shown, the height position of the cutting blade 50 along the Z-axis or the axis of the extrusion port 11 corresponds to the position of the notch 24, or the height position corresponding to the position of the notch 24 can be set as the cutting position. The print head 20 can move relative to the cutting mechanism 50. For example, the print head can move along the X-axis or along the XY plane determined by the X-axis and Y-axis. By moving the print head to the cutting blade 51 of the cutting mechanism 50, the print material at the notch 24 (or gap) can contact the blade of the cutting blade 51, and the cutting blade 51 can cut the print material 23 at the notch 24.

[0052] The printing material can be a filamentous material formed from plastics such as PLA (polylactic acid), ABS (Acrylonitrile Butadiene Styrene), nylon, metals, or fibers (such as glass fiber or carbon fiber), or a filamentous material such as TPU (Thermoplastic polyurethanes), rubber filamentous material, or cotton thread.

[0053] Example 2, in a specific embodiment of the present invention, such as Figure 1a , Figure 1b , Figure 2b and Figure 2cAs shown, the cutting blade 51 is provided with a protective structure, which includes a shielding part that blocks the front of the blade of the cutting blade 51. The shielding part partially or completely blocks the blade and is used to prevent the human hand from contacting the blade of the cutting blade 51.

[0054] exist Figure 1a and Figure 1b As shown, the protective structure consists of protruding structures 521 and 522 located on both sides in front of the blade along the blade direction. An opening 523 is formed between the protruding structures 521 and 522, exposing the blade. The width of the opening 523 is adapted to the size of the printing material 23, allowing the printing material 23 to contact the blade through the opening 523 and achieve cutting. Appropriately setting the width of the opening 523 (e.g., parallel to the blade, or parallel to the relative opposing movement direction of the cutting blade and the print head, or along the direction tangential to the blade) and the depth (e.g., perpendicular to the blade, or along the relative opposing movement direction of the cutting blade and the print head, or along the normal direction of the blade) allows the printing material 23 to contact the cutting blade through the opening 523 for cutting, while also preventing operators from accidentally inserting their fingers into the opening and injuring themselves. The diameter of the filamentary printing material 23 is typically 1.75mm, 2.85mm, or 3mm, which is generally significantly smaller than the diameter of an adult's finger. Therefore, simply making the width of the opening larger than the diameter of the printing material but smaller than the diameter or width of a finger effectively improves safety. Ideally, the width of the opening is smaller than its length (depth). The design of the opening 523 in this invention makes it less likely for an adult's finger to come into contact with the blade through the opening, thus improving safety.

[0055] Furthermore, the cutting blade 51 can be assembled with the protective structure (such as...). Figure 1a and Figure 1b (as shown); or the cutting blade 51 is integrally formed with the protective structure (such as...). Figure 2c (as shown); or the cutting blade 51 can be embedded into the protective structure via injection molding (e.g. Figure 2c (As shown).

[0056] The cutting blade can be mounted on a protective structure. For example, the protective structure can consist of upper and lower parts, with opposing sections having space to accommodate the cutting blade. The two parts can be joined together using a snap-fit ​​mechanism, screws, or adhesive to secure the cutting blade. The protective housing has an opening on one side of the blade to allow the printing material to contact the blade, enabling the cutting blade to cut the printing material. Specifically... Figure 1b and Figure 1aAs shown, the cutting blade 51 can be assembled by sandwiching the lower protective housing 531 and the upper protective housing 532 in the middle. A hole 511 can also be provided on the cutting blade 51, and a corresponding matching post 533 can be provided on the lower protective housing 531. This assembly, through the cooperation of the hole 511 and the post 533, can enhance the positioning accuracy and installation stability of the cutting blade 51 on the lower protective housing 531. For example, protrusions 521 and 522 can be provided on the lower protective housing 531, forming an opening 523 between the two protrusions.

[0057] Figures 2a to 2c The print head 20 can move along the XY plane. For example, the print head 20 can move along the first guide rail 61, and the first guide rail 61 can move along the second guide rail 62. The second guide rail 62 is set at an angle to the first guide rail 61, and ideally, they are set perpendicular to each other. The cutter 51 is fixedly connected to the second guide rail 62. Additionally, a filament feeder 22 can be installed on the print head 20. A notch 24 along the feed tube can be positioned between the filament feeder 22 and the hot end 10. The height (along the Z-axis or perpendicular to the printing platform 71) of the cutter 51 corresponds to and matches this notch. Figure 2a This indicates that the print head 20 has moved to the cutting position of the cutting mechanism 50. The cutting position refers to the position where the cutting mechanism or print head is ready to cut. At the cutting position, the cutting blade corresponds to the notch of the print head. For example, when the print head moves to the cutting blade position of the cutting mechanism, the cutting blade and the print head will then move towards each other to complete the cutting action. Figure 2b This illustrates the opposing movement of the print head and the cutting blade, for example, the print head moving towards the cutting blade 51, which extends into the notch area between the filament feeder 22 and the hot end 10 on the print head, cutting the printing material at the notch. Figure 2b It can also be seen that the printing material 23 reaches the blade of the cutting knife 51 through the opening 523 of the cutting mechanism protective structure. Figure 2c After the printing material is cut, the print head and the cutting blade move in opposite directions. For example, this indicates that the print head 20 has left the cutting blade 51, and the printing material 23 at the notch has been cut off. Figure 2c It can also be illustrated that opposing protrusions 524 can be provided inward at the opening 523 of the protective structure. For example, the distance between two pairs of opposing protrusions 524 is greater than the diameter of the printing material 23. This reduces the depth of the narrowest part of the opening 523 (i.e., the area between the two pairs of protrusions 524), and the protrusions 524 can also be made arc-shaped, which is more conducive to the printing material 23 entering the opening 523. Figure 2bAlternatively, as shown in 2c, the cutting blade 51 can also be embedded inside the protective housing by injection molding. For example, during injection molding, the blade is placed into the injection mold to form an integral part with an embedded blade. Or the cutting blade and the protective structure can be integrally molded. For example, the cutting blade and the protective structure can be integrally molded from steel, with two protruding structures directly formed on the blade side of the cutting blade to prevent accidental contact with the blade by human hands.

[0058] Example 3, in one specific embodiment of the present invention, such as Figure 4 As shown, the cutting mechanism 51 also includes a drive mechanism 54 that is driven to the protective structure. The drive mechanism 54 drives the protective structure to adjust between the shielded position and the open position, so that the shielding part blocks the blade part or the shielding part moves away to expose the blade part.

[0059] like Figure 4 As shown, the protective structure is a protective cover 52, which covers the cutting blade 51 to protect it. A drive mechanism 54 drives the protective cover 52 to rotate. When cutting is required, for example, when the print head 20 moves towards the cutting blade 51, the drive mechanism 54 can rotate the protective cover 52 to open it, exposing the cutting edge of the cutting blade 51 towards the print head 20. The print head 20 then moves towards the cutting blade 51, causing the printed material 23 at the notch to contact and be cut by the cutting blade 51. After the print head 20 leaves the cutting mechanism 50, the drive mechanism 54 drives the protective cover 52 back to the state of covering the cutting blade 51. The drive mechanism 54 can also drive the protective cover 52 to open or return to the state of covering the cutting blade 51 by moving it linearly.

[0060] Furthermore, the protective cover 52 includes a first baffle disposed above the cutting blade 51 and a second baffle perpendicularly connected to the first baffle, the second baffle being positioned in front of the cutting edge of the cutting blade 51.

[0061] Furthermore, the drive mechanism 54 can be a servo motor, a steering gear, or a motor. The drive mechanism 54 can directly drive the protective cover 52, or it can drive the protective cover 52 through a rocker arm, connecting rod, lead screw, synchronous belt drive, or gear drive.

[0062] Figure 4The 3D printing device illustrated in the diagram can also adopt a parallel-arm delta structure, such as three vertical second guide rails 62 arranged around the printing platform 71. Each second guide rail 62 is equipped with a movable seat (slider) 66, and each movable seat 66 is connected to the print head through a connecting rod. For example, each movable seat 66 is connected to the print head 20 through a first connecting rod 73 and a second connecting rod 74. The two ends of each connecting rod can be connected to the movable seat 66 and the print head 20 through ball joints or universal joints, respectively. In order to reduce the movement distance of the print head 20 during cutting, the cutting mechanism 50 can be set on the first guide rail 61 (vertical guide rail). During the printing process, the cutting mechanism 50 can move to the corresponding vertical position as the print head 20 is in the vertical position. Alternatively, the cutting mechanism can also be set on a movable arm 65, which is slidably set on the first guide rail 61. Ideally, the movable arm 65 can drive the cutting mechanism to move along the vertical direction of the first guide rail 61, so that the cutting blade can move in the vertical plane (the plane passing through the Z-axis).

[0063] Example 4, as Figure 8 , Figure 7a , Figure 7b or Figure 4 As shown, the drive mechanism 54 can drive the cutting blade 51 to move or swing, such as Figure 7a and Figure 7b As shown, the drive mechanism 54 drives the cutting blade 51 to move, as... Figure 8 As shown, the drive mechanism 54 drives the cutting blade 51 to swing. Of course... Figure 7a or Figure 7b The embodiments shown can also employ Figure 8 The oscillating motion shown drives the cutting blade. Figure 8 The cutting mechanism in the middle can also be adopted Figure 7a The cutting blade 51 can be moved in the manner shown in 7b. Figure 2a The shaft 67 can also be driven to rotate by the drive mechanism 54 (not shown in the figure), thereby causing the cutting blade 51 to swing. Or as... Figure 4 As shown, the cutting mechanism is mounted on the movable arm 65, which drives the cutting mechanism or the cutting blade 51 to move. During cutting, when the print head moves to the cutting position of the cutting mechanism, the cutting blade moves towards the print head by linear movement or oscillation, so that the cutting blade inserts into the notch of the print head and cuts the printing material.

[0064] Figure 7a and Figure 7b In the process, when cutting is required, the print head moves to the cutting position of the cutting mechanism, and the cutting blade 51 is driven by the drive mechanism 54 to move towards the print head in a direction at an angle to the X-axis (such as the Y-axis direction). Figure 7b As shown, the cutting blade 51 cuts the printed material 23. Figure 7bThe diagram illustrates that the drive mechanism 54 drives the cutting blade 51 to move in an angled direction (such as the Y-axis) to the X-axis via the transmission unit 64. The transmission unit 64 is connected to the nut on the cutting blade 51 via a lead screw to drive the cutting blade. Of course, the transmission unit 64 can also be other types, such as gear transmission, synchronous belt transmission, or rack and pinion transmission. Figure 7a The schematic diagram shows that the drive mechanism 54 drives the cutting blade 51 to move or swing via the swing arm 97. After cutting, the drive mechanism 54 drives the cutting blade 51 to move in the opposite direction or swing back. Then the print head can be used to change the printing material 23, change the hot end 10, or proceed with other processes or subsequent printing processes. Figure 7a The blade of the cutting blade 51 can also be inclined (the relative moving direction of the cutting blade and the print head is at an angle that is not perpendicular to the blade of the cutting blade). The inclined blade can reduce the force on the printing material during the cutting process and also help to reduce the deformation of the printing material fracture after cutting.

[0065] Figure 7a The diagram also illustrates that a sensor 57 can be set to detect whether the cutting blade moves during the cutting process. If it does not move, it indicates that no cutting is being performed and an alarm can be triggered. Alternatively, a stress sensor 57a can be set to detect the force on the cutting blade during the cutting process. If the force is too great (meaning the force exceeds a preset value), an alarm can be triggered. This sensor 57 or stress sensor 57a can be set in other embodiments of this application, for example... Figure 2c and Figure 9c The stress sensors 57a in the diagram can all be used to detect the force on the cutting blade. For example, the stress sensor 57a can be a strain gauge, a tensile or compressive sensor, or a deformation sensor, etc., or it can detect the force on the cutting blade by detecting the deformation of the elastic element compressed by the cutting blade. The sensor 57 can be a Hall sensor, a limit switch, or a photoelectric switch, etc.

[0066] Figure 7a and Figure 7b The diagram also illustrates a protective plate 52a, which is positioned in front of the cutting blade 51. A gap 525 is provided at a position corresponding to the cutting blade on the protective plate 52a, allowing the cutting blade 51 to pass through the gap 525. Figure 7a In the middle, when cutting is not required, the cutting blade 51 retracts, for example, the cutting edge retracts into or behind the slit 525. When cutting is required, for example, when the print head has moved to the cutting position corresponding to the cutting mechanism, the cutting blade is driven by the drive mechanism to extend through the slit 525 (e.g., Figure 7b As shown, the cutting blade 51 cuts the printing material on the print head, and then the cutting blade 51 is driven by the second drive structure to retract into the gap 525 or behind it, so as to avoid interference with the movement of the print head, and the cutting blade 51 can be blocked by the protective plate 52a.

[0067] like Figure 7a and Figure 7b As shown, the shielding part is located in the area in front of the blade of the cutting blade 51. The shielding part has a slit 525 for the cutting blade 51 to pass through. The cutting mechanism 50 also includes a drive mechanism 54 that is driven to the cutting blade 51. The drive mechanism 54 can drive the cutting blade 51 to extend out of the slit to make a cut. After the cut is completed, the cutting blade 51 is driven to retract to the rear of the shielding part.

[0068] Figure 7a and Figure 7b In one variation of the embodiment, a blocking part is disposed in front of the blade part. The blocking part has a slit 525 for the cutting blade 51 to pass through. A first elastic member is connected to the blocking part. A driving member is provided on the print head corresponding to the blocking part. When the print head moves toward the cutting mechanism or the cutting blade, or when the cutting mechanism or the cutting blade moves toward the print head, the driving member pushes the blocking part to allow the cutting blade 51 to extend out of the slit 525 to complete the cutting. When the driving member separates from the blocking part, the blocking part returns to its original position under the action of the first elastic member. The driving member is preferably a rod-shaped member, and its setting direction can be consistent with the setting direction of the first elastic member.

[0069] Figure 8 The cutting mechanism 50 is illustrated with a drive mechanism 54 that drives the cutting blade 51 to swing. The cutting edge of the cutting blade 51 is inclined or arranged along an involute or other variable radius curve. When cutting the printing material, the print head moves to the cutting position of the cutting mechanism 50, and the drive mechanism 54 drives the cutting blade 51 to swing. The cutting edge of the cutting blade 51 extends into the notch of the printing material conveying path on the print head to cut the printing material 23. A protective structure 52b can also be provided. When the cutting blade 51 returns to its original position, it is covered by the protective structure 52b to prevent the cutting edge from being exposed. When cutting, the drive mechanism 54 can drive the cutting blade 51 to swing out of the protective structure 52b to cut the printing material 23. For example, the cutting mechanism 50 can be connected to the frame of the 3D printing device (not shown in the figure) or to the first guide rail 61, or as... Figure 4 The slidable setting shown is on a vertical guide rail. Figure 8The 3D printing device illustrated in the figure has a print head 20 mounted at one end of a swing arm 68. The other end of the swing arm 68 is rotatable relative to a movable seat 66, for example, it can be connected to a shaft 67. The shaft 67 is rotatably mounted on the movable seat 66, which can move along a first guide rail 61. Thus, the printing area 72 of the print head 20 on the printing platform 71 is shown by the double-dotted line in the figure. The print head 20 is slidably mounted on the guide rail 66 via the swing arm 68. The figure also illustrates that the filament feeder (extruder) 22 mounted on the print head can drive the printing material 23 to be fed along the axis by a multi-screw or threaded rod rolling around the printing material 23. The filament feeder (extruder) 22 shown in the figure includes two smooth rollers and a drive roller with (spiral or annular) protrusions on its surface. The three rollers are arranged around the printing material 23, and the three rollers rotate around the printing material 23 and roll on the surface of the printing material. The protrusions of the drive roller are at least partially embedded in the surface of the printing material 23, driving the printing material 23 to be fed along the axis. Alternatively, the extruder can use two parallel rollers that rotate to drive the feeding of the printing material, or any other extruder that drives the feeding of the printing material.

[0070] Figure 7a , Figure 7b , Figure 2a or Figure 8 It can also be used in China Figure 4 The protective cover and corresponding drive mechanism shown (or Embodiment 3) may also employ the protective structure shown in Embodiment 2 or Embodiment 5. Additionally... Figure 7a or Figure 7b An example 3D printer structure is also provided, in which the print head 20 can move along a first guide rail 61. For example, the first guide rail can be the X-axis guide rail in an I3 structure (gantry frame) or cantilever 3D printer, allowing the cutting mechanism 50 to be connected to the first guide rail 61 (X-axis guide rail). If the X-axis guide rail can also move along the Z-axis, for example… Figure 3b The second guide rail 62 is a Z-axis guide rail, and the printing platform 71 can move along the Y-axis. Since the cutting mechanism can be connected to the X-axis assembly, the print head can directly move along the X-axis to the cutting position of the cutting mechanism during cutting. Figure 7b As shown, the drive mechanism 54 then drives the cutting blade 51 to move towards the print head to cut. Alternatively, the cutting mechanism also includes a drive mechanism connected to the cutting blade drive, which drives the cutting blade to move towards the printing material on the print head to cut the printing material, as shown. Figure 7a and Figure 7b In the embodiment shown, the cutting mechanism 50 can be fixedly connected to the first guide rail 61, the print head 20 is slidably mounted on the first guide rail 61, and the cutting blade 51 can move or swing under the drive of the driving mechanism 54. That is, the print head 20 can be moved to the cutting position of the cutting mechanism, and then the driving mechanism 54 drives the cutting blade 51 to move toward the print head 20 to complete the cutting of the printing material.

[0071] In a specific embodiment of the present invention, the shielding part is a protruding structure provided on both sides of the blade, wherein at least one protruding structure is movably connected to the cutting mechanism relative to the cutting blade, and the two protruding structures can be moved closer together to block the blade or moved away to expose the blade by means of adjustment.

[0072] Thus, the two protruding structures can be configured such that one protruding structure is fixed and the other is movably connected, or both protruding structures can be movably connected.

[0073] Furthermore, the protruding structure movably connected to the cutting mechanism is rotatably mounted on the cutting blade or the cutting mechanism via the first rotating shaft. The cutting mechanism 50 is also provided with a second elastic element, which allows the two protruding structures to come together and block the blade under the action of the second elastic element.

[0074] In one embodiment, the two protruding structures initially have a gap and / or the two protruding structures are provided with guide slopes. When the print head moves toward the cutting mechanism or the cutting blade, or when the cutting mechanism or the cutting blade moves toward the print head, the printing material on the print head can be squeezed in from the gap or the guide slope to allow the movable protruding structure to rotate and open, so that the printing material can contact the blade of the cutting blade and complete the cutting of the printing material.

[0075] In another embodiment, the protrusion mechanism movably connected to the cutting blade or cutting mechanism is provided with a toggle part; the print head is provided with a toggle member corresponding to the toggle part. When the print head moves toward the cutting mechanism or cutting blade, or when the cutting mechanism or cutting blade moves toward the print head, the toggle member can toggle the corresponding toggle part so that the two protrusion structures move away from each other and thus expose the blade.

[0076] In one specific embodiment of the present invention, a protruding structure movably connected to the cutting mechanism is movably disposed on the cutting mechanism. The cutting mechanism is also provided with a second elastic member, which allows the two protruding structures to come together and block the blade under the action of the second elastic member.

[0077] In one embodiment, the two protruding structures initially have a gap and / or the two protruding structures are provided with guide slopes. When the print head moves toward the cutting mechanism or the cutting blade, or when the cutting mechanism or the cutting blade moves toward the print head, the printing material on the print head can be squeezed in from the gap or the guide slope, causing the movable protruding structure to move away from the other protruding structure, so that the printing material can come into contact with the blade of the cutting blade and complete the cutting of the printing material.

[0078] In another embodiment, the protrusions movably connected to the cutting structure are provided with a toggle portion; the print head is provided with a toggle member corresponding to the toggle portion. When the print head moves toward the cutting mechanism or the cutting blade, or when the cutting mechanism or the cutting blade moves toward the print head, the toggle member can toggle the corresponding toggle portion so that the two protrusions move away from each other and thus expose the blade portion.

[0079] The aforementioned elastic element can be a cylindrical spring, torsion spring, or elastic sheet, etc.

[0080] Figure 3a In the illustrated embodiment, the protective structure includes a protrusion structure 521 and a protrusion structure 522, which are respectively swayable around a first rotating shaft 5211 and a third rotating shaft 5221. Corresponding elastic elements 63 can be respectively provided on the first rotating shaft 5211 and the third rotating shaft 5221. These elastic elements 63 can be coil springs (e.g.,...). Figure 3a or Figure 3c (as shown) or using elastic sheets (such as Figure 3b As shown), under the action of their respective elastic elements 63, the protruding structures 521 and 522 swing and move closer together to protect the cutting edge of the cutting blade 51. Alternatively, only one elastic element can be provided, which can be a tension spring. The two ends of this elastic element are connected to the protruding structures 521 and 522 respectively. The elastic force of this element causes the protruding structures 521 and 522 to swing and move closer together to protect the cutting edge of the cutting blade 51. When cutting is required, the print head 20 moves to the cutting position of the cutting mechanism 50, and the print head further moves towards the cutting blade, as shown. Figure 3b As shown, the protruding structures 521 and 522 of the protective structure are pushed open to form an opening, through which the printing material 23 contacts the blade of the cutting blade 51 and is cut, or as... Figure 3cAs shown, a toggle part 5213 and a toggle part 5223 can also be provided on the protruding structures 521 and 522 of the protective structure, respectively. For example, the toggle part 5213 and the toggle part 5223 can be columns extending in the Z-axis direction. At the same time, a toggle member 43 is provided on the print head. For example, the end of the toggle member 43 is tapered, with the small end facing the cutting mechanism. When the print head moves to the cutting mechanism, the toggle member 43 of the print head will push the toggle part 5213 and the toggle part 5223 of the cutting mechanism apart. For example, the toggle member 43 with the tapered end can be inserted into the toggle part 521. 3. The actuating part 5223 separates the two parts. The actuating parts 5213 and 5223 respectively drive the protruding structures 521 and 522 to swing and separate around their respective first and third rotating axes to form an opening, allowing the printing material on the print head to pass through. This allows for more precise and reliable control of the protruding structures 521 and 522 to separate and form an opening, and helps to avoid the notch area of ​​the print head being occupied by the protective structure of the cutting mechanism, thus reducing the notch area on the print head and eliminating the need to reserve clearance space to avoid the protective structure of the cutting mechanism. Alternatively, the protective structure can be a translational movement instead of a swinging movement. For example, the protruding structure 521 can be pushed by a spring or spring sheet to move towards the protruding structure 522 to protect the cutting edge. When cutting, the protruding structure 521 is pushed away and moves away from each other to form an opening. Alternatively, the protective structure can only swing or move on one side. For example, the protruding structure 521 can be fixed to the cutting blade without swinging or moving, allowing only the protruding structure 522 to swing or move. In summary, the openable protective structure allows for the concealment of the blade-type cutting mechanism, ensuring that the cutting edge of the cutting blade 51 is completely protected when not cutting, thus enhancing safety and reliability. Furthermore... Figure 3a This indicates that the print head can move along the first guide rail 61. Figure 3b and Figure 3c The diagram illustrates that the first guide rail 61 can move along the second guide rail 62. Figure 3b The second guide rail 62 is set in a Z-axis manner. Figure 3c The second guide rail 62 is configured in a Y-axis manner. This allows the cutting mechanism 50 to be connected to the first guide rail 61, so that if the first guide rail 61 moves, the cutting mechanism 50 can move accordingly. Alternatively, the cutting mechanism 50 can also be connected to the frame of the 3D printer, such as through a fixed connection, or as... Figure 4The slideable arrangement shown is on a Z-axis guide rail. Furthermore, the third rotating shaft 5221 and the first rotating shaft 5211 can be coaxially combined into a single shaft, located on an extension line between the protruding structures 521 and 522. The actuating element 43 can also be a push rod on the print head, which can directly push the actuating parts 5213 and 5223, for example, along the direction of the first guide rail 61, causing the protruding structures 521 and 522 to open and form openings. When the print head moves away from the cutting mechanism, the protruding structures 521 and 522 return to their original state of protecting the cutting blade under the action of their respective elastic elements. Figures 3a to 3c The protrusions 521 and 522 shown can also be opened or closed by a drive mechanism. For example, the output shaft of the drive mechanism (such as a servo motor) is coaxially arranged with the first rotating shaft 5211 and drives the protrusion 521, and the same applies to the protrusion 522.

[0081] In Example 6, the movement of the print head is driven by a transmission mechanism to move the cutting blade and cut the printing material on the print head. The cutting mechanism includes a transmission mechanism, a pushing part, and a third elastic element. The print head has a corresponding pushing element. When the print head moves relative to the cutting mechanism or the cutting blade, the pushing element pushes the pushing part and drives the cutting blade to move towards the print head through the transmission mechanism to cut the printing material on the print head. After the pushing element separates from the pushing part, the cutting blade can be reset under the action of the third elastic element.

[0082] like Figures 5a to 5g As shown, the transmission mechanism adopts a rocker arm type transmission method, including a rocker arm 97 and a second rotating shaft 513. Figure 5a The schematic diagram shows that the swing arm 97 is rotatably mounted on the cutting mechanism 50 via the second rotating shaft 513. The cutting blade 51 and the pushing part 512 are spaced apart on the swing arm 97. The cutting mechanism 50 is also provided with an elastic element 63 (third elastic element) corresponding to the cutting blade 51. The cutting blade 51 is provided with the pushing part 512. The print head 20 is provided with a pushing element 34 (which may be the heat dissipation fin 31 in the figure) corresponding to the pushing part 512. When the print head 20 moves relative to the cutting mechanism 50 or the cutting blade 51, the pushing element 34 pushes the pushing part 512 to drive the cutting blade 51 to move towards the print head 20 or swing around the second rotating shaft 513 towards the print head 20 to cut the printing material 23 on the print head 20. After the pushing element 34 separates from the pushing part 512, the cutting blade 51 is reset under the action of the elastic element 63.

[0083] Furthermore, the cutting edge of the cutting blade 51 is arranged at an angle, such as... Figure 5a , Figure 5b , Figure 5c , Figure 5f and Figure 5gIn the illustrated embodiment, the blade is inclined. Choosing a suitable inclination angle for the blade facilitates adjustment of the cutting force on the printing material. And / or, as... Figure 5f As shown, the portion of the pusher 34 that contacts the pusher 512 is an inclined surface. And / or, the direction in which the cutter 51 cuts the printing material is opposite to or at an angle to the direction of relative movement between the print head and the cutting mechanism or the cutter. And / or, as... Figure 5g As shown, it also includes a secondary cutting blade 51a, a secondary pushing part 512a, and a secondary swing arm 97a arranged opposite to the cutting blade 51. The secondary swing arm 97a can also rotate around the second rotating shaft 513. The secondary cutting blade 51a and the secondary pushing part 512a are arranged at intervals on the secondary swing arm 97a. The cutting mechanism 50 is also provided with another elastic element 63 corresponding to the secondary cutting blade 51a. The print head 20 is provided with a pushing member 34 corresponding to the secondary pushing part 514. When the print head 20 moves relative to the cutting mechanism 50 or the cutting blade 51, the pushing member 34 pushes the pushing part 512 and the secondary pushing part 514, causing the cutting blade 51 and the secondary cutting blade 51a to rotate around the second rotating shaft 513, so that the blades of the cutting blade 51 and the secondary cutting blade 51a swing towards each other in a scissor-like manner to achieve shearing cutting of the printing material 23. After the pushing member 34 separates from the pushing part 512 and the secondary pushing part 512a, the cutting blade 51 and the secondary cutting blade 51a are reset under the action of their respective elastic elements 63. The cutting blade 51 and the auxiliary cutting blade 51a constitute a pair of scissors. The lever 97 and the cutting blade 51 can be assembled together or integrally formed; the cutting mechanism may also include a guide rail structure (not shown in the figure), the lever 97 actuates the cutting blade 51 so that the cutting blade can slide along the guide rail structure (e.g., ...). Figure 6f (Illustrative); The cutting mechanism includes a guide rail structure (not shown in the figure), and the pusher 34 pushes the pusher 512 to slide along the guide rail structure. The pusher can actuate the rocker arm to swing around the second pivot. Alternatively, the cutting blade can also have an inclined structure, such as... Figure 5a , Figure 5b , Figure 5c , Figure 5f , Figure 5g or Figure 6f As shown, this reduces the impact during the cutting of printing material and minimizes the deformation of the cut end. It also allows for oblique cutting, which is equivalent to the cutting blade having an oblique edge. Alternatively, it can easily adapt to open structures with different orientations of the notches on the print head.

[0084] Figure 5a The schematic diagram shows that the swing arm 97 drives the cutting blade 51 to swing around the second rotating shaft 513. The cutting edge of the cutting blade 51 can be set at one end of the swing arm 97 relative to the second rotating shaft 513. A pushing part 512 is set at the other end of the swing arm 97 relative to the second rotating shaft 513. A corresponding pushing member is set on the print head 20 corresponding to the pushing part 512. This pushing member can be part of the structure of the print head itself or a specially set push rod, such as... Figure 5c The pusher 34 is shown. The cutting edge of the cutter can be angled, as the print head moves to the cutting position of the cutting mechanism, such as... Figure 5b As shown, the pushing part 512 on the cutting blade is in contact with or close to the pushing member on the print head in the first direction, while the cutting edge of the cutting blade is in contact with or close to the printing material in the second direction. Then, the relative movement between the print head and the cutting mechanism, for example, moving towards each other in the first direction, or the print head moving towards the cutting mechanism in the first direction, allows the pushing member on the print head to push the pushing part 512 on the cutting mechanism in the first direction. Through the transmission action of the swing arm 97, the cutting blade 51 rotates around the second rotating shaft 513, thus allowing the cutting edge of the cutting blade 51 to cut the printing material 23 in the second direction. Figure 5c As shown, the first direction and the second direction are set at an angle, for example, they can be perpendicular to each other. When the print head moves away from the cutting mechanism, the cutting blade 51 can return to its initial position under the action of the elastic element 63 (such as a cylindrical spring or a coil spring wrapped around the shaft 513). This method allows the relative movement direction of the print head and the cutting mechanism to be different from the direction in which the cutting blade cuts the printing material, for example, they can be perpendicular, which is more conducive to expanding the application range. In addition, the cutting edge of the cutting blade can also be inclined, because reference Figure 5b and 5c It can be seen that the movement of the cutting blade 51 cutting the printing material is a composite motion formed by the movement of the print head approaching the cutting mechanism (for example, the print head moving to the left along the first guide rail 61 towards the cutting mechanism) and the swinging of the cutting blade 51 around the second rotating shaft 513. Setting a suitable angle between the cutting blade and the first and second directions is beneficial to adjusting the cutting force of the cutting blade on the printing material and the relative movement distance required to complete the cutting of the print head and the cutting mechanism.

[0085] Figure 5d and Figure 5e The pusher 34 on the print head and the pusher 512 on the cutting mechanism push each other in the first direction, while the blade of the cutter 51 also cuts the printing material 23 in the first direction. Figure 5d The print head 20 moves to the cutting position of the cutting mechanism 50, and then the print head moves towards the cutting mechanism, for example, the print head 20 moves toward the cutting mechanism 50. The pusher 34 on the print head pushes the pusher 512 on the cutting blade 51 in the first direction, and the cutting blade 51 swings around the second rotating shaft 513 via the transmission of the swing arm 97. Figure 5e As shown, the cutting blade 51 swings or moves toward the print head, while the print head moves toward the cutting mechanism. This can speed up the movement of the cutting blade and the printing material 23 toward each other, or reduce the distance the print head and the cutting mechanism move toward each other, allowing the cutting blade 51 to cut the printing material 23 more quickly. Figure 5fFurther illustration shows that the part of the pusher 34 on the print head that contacts the pusher 512 on the cutting mechanism is an inclined surface. By adjusting the angle of this inclined surface, the distance of the blade swing of the cutting blade during the process of the print head and the cutting mechanism moving towards each other can be adjusted. When the print head and the cutting mechanism move at a certain speed, the force of the cutting blade on the printing material or the distance of the print head and the cutting mechanism moving towards each other can be adjusted. Figure 5g Further illustration suggests that two cutting blades can be provided, such as a primary cutting blade 51 and a secondary cutting blade 51a, which rotate around a second rotating shaft 513 via a swing arm 97 and a secondary swing arm 97a, respectively. The primary cutting blade 51 and the secondary cutting blade 51a are positioned opposite each other on one side of the second rotating shaft 513. When the print head moves towards the cutting mechanism, for example, when the print head moves towards the cutting mechanism, two pushing members 34 on the print head push the corresponding pushing parts 512 and secondary pushing parts 512a of the primary cutting blade 51 and the secondary cutting blade 51a, respectively, causing the blades of the primary cutting blade 51 and the secondary cutting blade 51a to swing towards each other and cut the printed material 23 between them, thus cutting the printed material 23 on the print head 20. When the print head leaves the cutting mechanism, two elastic members 63 respectively cause the primary cutting blade 51 and the secondary cutting blade 51a to return to their initial state. Protective structures can also be provided at the blades of the primary cutting blade 51 and the secondary cutting blade 51a. Figures 5a to 5f A similar protective structure can be set at the cutting blade 51, such as a protruding structure 52. For example, the protective structure covers the blades of both the cutting blade 51 and the secondary cutting blade 51a, but leaves an opening in the direction where the two blades face each other so that the printing material 23 can pass through. Figures 6a to 6e As shown, the cutting mechanism may include a transmission mechanism that transmits the relative motion (such as the movement of the print head) between the print head and the cutting mechanism to the cutting blade. For example, the cutting mechanism may include a transmission mechanism, a pushing part 512, and an elastic element 63 (a third elastic element). A pushing element 34 is provided on the print head 20 corresponding to the pushing part 512. When the print head 20 moves relative to the cutting mechanism 50 or the cutting blade 51, the pushing element 34 pushes the pushing part 512 and drives the cutting blade 51 towards the print head 20 via the transmission mechanism to cut the printed material 23 on the print head 20. After the pushing element 34 separates from the pushing part 512, the cutting blade 51 returns to its original position under the action of the elastic element 63. This allows for a more compact and flexible cutting mechanism that drives the cutting blade through the movement of the print head. It also allows the movement of the print head (or the movement of the cutting mechanism) to cause the cutting blade to move in the opposite direction towards the print head, and allows the relative speed of the cutting blade and the print head to be twice as fast as the movement of the print head (or the movement of the cutting mechanism) alone, achieving faster cutting. Further explanation follows.

[0086] like Figures 6a to 6dAs shown, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack 91, a gear 93, and a second rack 92. The first rack 91 and the second rack 92 mesh with the gear 93 on opposite sides. A pushing part 512 is disposed on the first rack 91, and a cutting blade 51 is disposed on the second rack 92. When the print head 20 moves relative to the cutting mechanism 50 or the cutting blade 51, the pushing member 34 pushes the pushing part 512, which in turn pushes the first rack 91 to move along a first direction (e.g., to the left in the figure) and drives the gear 93 to rotate (e.g., counterclockwise in the figure). The gear 93 drives the second rack 92 to move along a second direction (e.g., to the right in the figure) and drives the cutting blade 51 to move toward the print head 20 (in the figure, the print head 20 is located to the right of the cutting mechanism) to cut the printing material 23 on the print head 20, for example, cutting the printing material 23 at the notch 24 on the print head. The first direction and the second direction can be opposite directions, or they can be at an angle.

[0087] Alternatively, the transmission mechanism is a rack and pinion mechanism, including a first rack, a gear, and a second rack, and a housing 94. The first rack and the second rack mesh with the gear on opposite sides of the gear. The pushing part is disposed on the first rack, and the cutting blade is disposed on the second rack. The elastic element 63 (third elastic element) is a compression spring with one end abutting against the housing 94 and the other end abutting against the pushing part 512 or the first rack 91. Alternatively, the elastic element 63 is a tension spring with one end connected to the housing 94 and the other end connected to the second rack 92 or the cutting blade 51. The gear 93 is rotatably disposed on the housing 94 via a rotating shaft. The housing 94 in the figure may also be provided with front and rear covers, which are omitted in the figure for display purposes.

[0088] Alternatively, gear 93 can be rotatably mounted on housing 94 via a rotating shaft, with guide rail structures provided on both sides of housing 94 opposite to gear 93, such as... Figures 6b to 6d The guide rail structures 943 and 944 are in the middle, and the first rack 91 and the second rack 92 are in sliding engagement with the two guide rail structures 943 and 944 respectively.

[0089] Or, such as Figure 6c and Figure 6dAs shown, the transmission mechanism is a gear and rack transmission mechanism, including a first rack, a gear, and a second rack. The gear 93 includes a large gear 932 and a small gear 931 coaxially fixedly connected. The pitch circle or pitch circle diameter of the large gear 932 is larger than that of the small gear 931. The pushing part 512 is disposed on the first rack 91, and the cutting blade 51 is disposed on the second rack 92. The first rack 91 meshes with the small gear 931 on the first side of the gear 93, and the second rack 92 meshes with the large gear 932 on the second side of the gear 93. The first side and the second side are opposite sides of the gear 93 along the direction perpendicular to the axis of the gear 93. This allows the movement of the cutting blade to be amplified. For example, the print head and the cutting mechanism can move relatively a shorter distance (e.g., the print head moves) to drive the cutting blade to move a longer distance to reach the notch 24 on the print head to cut the printing material 23. This helps to reduce the displacement of the print head or increase the printable area size of the print head.

[0090] Or, such as Figure 6c and Figure 6d As shown, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, and a second rack. The gear 93 includes a large gear 932 and a small gear 931 coaxially fixedly connected, with small gears 931 respectively arranged on both sides of the gear 93 relative to the large gear 932 along the axis of the gear 93. The pitch circle diameter of the large gear 932 is larger than that of the small gear 931. The pushing part 512 is arranged on the first rack 91, and the cutting blade 51 is arranged on the second rack 92. The first rack 91 is divided into two parts and meshes with two small gears 931 on the first side of the gear 93, and the second rack 92 meshes with the large gear 932 on the second side of the gear 93. The first side and the second side are on both sides of the gear 93 along the direction perpendicular to the axis of the gear 93. By simultaneously meshing the two parts of the first rack 91 with the two small gears 931 on both sides of the large gear 932, the force on the gear 93 is more balanced, which not only helps to increase the transmission force or reduce the size of the gear, but also improves the operational reliability and durability of the transmission mechanism.

[0091] Alternatively, you can refer to Figure 6c and Figure 6d The transmission mechanism is a rack and pinion mechanism, including a first rack, a gear, and a second rack. The gear 93 includes a large gear 932 and a small gear 931 coaxially fixedly connected. The pitch circle diameter of the large gear 932 is larger than that of the small gear 931. The pushing part 512 is mounted on the first rack 91, and the cutting blade 51 is mounted on the second rack 92. Figure 6c and Figure 6dThe difference is that the first rack 91 meshes with the large gear 932 on the first side of the gear 93, and the second rack meshes with the small gear 931 on the second side of the gear 93, wherein the first side and the second side are opposite sides of the gear 93 along the direction perpendicular to the axis of the gear 93; this allows the driving force of the print head (or cutting mechanism) on the cutting blade to be amplified. For example, when the print head and the cutting mechanism move relative to each other (e.g., the print head moves), the pusher on the print head pushes the pusher of the cutting mechanism. This driving force is amplified by the transmission mechanism and drives the cutting blade to cut the printing material 23 at the notch 24 on the print head. This is beneficial for cutting more difficult-to-cut printing materials, such as printing materials with higher hardness or emphasis, such as thicker metal wires or carbon fiber filaments.

[0092] Alternatively, you can refer to Figure 6c and Figure 6d The transmission mechanism is a rack and pinion mechanism, including a first rack, a gear, and a second rack. The gear 93 includes a large gear 932 and a small gear 931 coaxially fixedly connected, with the small gear 931 positioned on either side of the large gear 932 along the axis of the gear 93. The pitch circle diameter of the large gear 932 is larger than that of the small gear 931. The pushing part 512 is mounted on the first rack 91, and the cutting blade 51 is mounted on the second rack 92. Figure 6c and Figure 6d The difference is that the first rack 91 meshes with the large gear 932 on the first side of the gear 93, and the second rack 92 is divided into two parts and meshes with two small gears 931 on the second side of the gear 93 respectively. The first side and the second side are opposite to the gear 93 along the direction perpendicular to the axis of the gear 93. By simultaneously meshing the two small gears 931 with the two parts of the second rack 92 on both sides of the large gear 932, the force on the gear 93 is more balanced, and it is also more conducive to the small gears 931 and the second rack 92 transmitting a larger force to drive the cutting blade. This can increase the transmission power or reduce the size of the gears, and also improve the operational reliability and durability of the transmission mechanism.

[0093] Or, such as Figure 6eAs shown, the transmission mechanism can also be a synchronous belt transmission mechanism, including a synchronous belt 96, two synchronous pulleys 933, and a housing 94. The two synchronous pulleys 933 hold the synchronous belt 96 open. For example, the synchronous belt 96 is a closed synchronous belt (annular synchronous belt). The pushing part 512 is provided on the synchronous belt portion of the synchronous belt 96 on the first side opposite to the two synchronous pulleys, as shown in the figure. A first connecting pipe 961 can be provided on the synchronous belt portion on the first side, and the pushing part 512 is provided on the first connecting pipe 961. The cutting blade 51 is provided on the synchronous belt portion of the synchronous belt 96 on the second side opposite to the two synchronous pulleys, as shown in the figure. A second connecting pipe 962 can be provided on the second synchronous belt portion, and the cutting blade 51 is provided on the second connecting pipe 962. On the connector 962, when the print head 20 moves relative to the cutting mechanism 50 or the cutting blade 51, the pusher 34 pushes the pusher 512, which in turn pushes the timing belt 96 to rotate around the two timing pulleys 933. When the timing belt portion on the first side (the upper timing belt portion of the two timing pulleys 933 in the figure) moves in the first direction (to the left in the figure), it drives the timing belt portion on the second side (the lower timing belt portion of the two timing pulleys 933 in the figure) to move in the second direction (to the right in the figure) and drives the cutting blade 51 to move toward the print head 20 to cut the printing material on the print head, for example, cutting the printing material 23 at the notch 24 on the print head 20.

[0094] Or, such as Figure 6e As shown, the transmission mechanism is a synchronous belt transmission mechanism, including a synchronous belt 96, two synchronous pulleys 933, and a housing 94. The two synchronous pulleys 933 stretch the synchronous belt 96. The pushing part 512 is disposed on the synchronous belt portion of the synchronous belt 96 on the first side opposite to the two synchronous pulleys 933. The cutting blade 51 is disposed on the synchronous belt portion of the synchronous belt 96 on the second side opposite to the two synchronous pulleys. The elastic element 63 (third elastic element) is a compression spring with one end abutting against the housing 94 and the other end abutting against the pushing part 512 (which may include the first connecting pipe 961), or the elastic element 63 is a tension spring with one end connected to the housing 94 and the other end connected to the synchronous belt portion of the second side of the two synchronous pulleys or connected to the cutting blade 51. The two synchronous pulleys are rotatably disposed on the housing 94 via a rotating shaft.

[0095] Alternatively, the housing 94 of the cutting mechanism is provided with a first through hole 941 and a second through hole 942. Both the first through hole 941 and the second through hole 942 are located on the side facing the print head 20. The first through hole 941 is used for the push part 512 or the push member 34 to pass through, and the second through hole 942 is used for the cutting blade 51 to pass through. In the cutting state, the cutting blade 51 extends out of the second through hole 942, and in the reset state, the cutting blade 51 retracts into the second through hole 942. That is, the housing 94 can be regarded as a protective structure of the cutting mechanism, similar to... Figure 7a and Figure 7bThe protective plate 52a serves to ensure that, in the reset state (non-cutting state), the cutting blade retracts into the second through hole 942, preventing the cutting blade 51 from being exposed. If the pushing part 512 is also located within the first through hole 941 in the reset state (non-cutting state), it is less likely for a person to touch the cutting blade or the pushing part 512, and the cutting blade will not extend accidentally, thus enhancing safety. Figure 6c As shown. During cutting, as... Figure 6d As shown, by setting a pusher 34 (e.g., a columnar pusher) on the print head 20, which extends into the first through hole 941, the pusher 512 is pushed, and the cutter 51 is driven by the transmission mechanism to extend out of the second through hole 942. The cutter 51 extends into the notch 24 of the print head 20 to cut the printing material. During the cutting process, the cutter is easy to protect, and it is not easy for a person to come into contact with it, so the whole process is very safe. Figure 6c As shown, the protective structures at both ends (both sides) of the cutting edge on the cutting blade 51 do not necessarily need to be as described in Embodiment 2. Of course, protective structures 521 and 522 can also be provided at both ends (both sides) of the cutting edge of the cutting blade 51, such as... Figure 6a , Figures 6c to 6e As shown, when the cutting blade 51 extends out of the second through hole 942, it will not easily come into contact with the blade edge if accidentally touched, making it safer.

[0096] Or, such as Figures 6b to 6e As shown, the cutting mechanism 50 also includes a housing 94 and a base 95. The transmission mechanism is disposed within the housing 94. A buffer mechanism and / or sensor (such as a sensor that can detect the force between the cutting blade or the housing and the base, or a sensor that can detect the displacement between the housing and the base) are disposed between the housing 94 and the base 95. The buffer mechanism may include a buffer elastic element 58, with its two ends connected to the housing 94 and the base 95 respectively. During normal cutting, the buffer elastic element 58 pushes the housing 94 against the side of the base near the print head. The pushing force of the cutting process on the housing 94 is less than the force of the buffer elastic element 58, and the housing 94 and the base 95 will not move relative to each other. During abnormal cutting, such as when the cutting blade abuts against the outer shell of the print head, the print head generates a large driving force on the outer shell. If this force is greater than the elastic force of the buffer elastic element 58, the housing 94 moves relative to the base 95 (such as moving away from the print head) to buffer the force. A sensor 57 may also be disposed. The displacement of the housing 94 relative to the base 95 can trigger the sensor 57, which can trigger an alarm and stop the cutting process.

[0097] Or, such as Figure 6fAs shown, the transmission mechanism is a rack and pinion mechanism, including a first rack 91, a gear 93, a rocker arm 97, and guide rail structures 943 and 944. The first rack 91 meshes with the gear 93, one end of the rocker arm 97 is fixedly connected to the gear 93, and the pushing part 512 is disposed on the first rack 91. The first rack 91 can slide along the guide rail structure 943, and the rocker arm 97 can push the cutting blade 51 to slide along the guide rail structure 944 (the guide rail structure corresponding to the cutting blade), for example... Figure 6f The rocker arm 97 shown can move the cutting blade 51 by moving the sliding groove 971 to move the cutting shaft 515 on the cutting blade 51. When the print head 20 moves relative to the cutting mechanism or the cutting blade, the pusher 34 pushes the pusher part 512, which in turn pushes the first rack 91 to move along the first direction and drives the gear 93 to rotate. The gear 93 drives the rocker arm 97 to rotate and moves the cutting blade to slide along the corresponding guide rail structure toward the print head 20 to cut the printing material 23 on the print head.

[0098] Or, such as Figure 6f The transmission mechanism shown is a rack and pinion mechanism, including a first rack 91, a gear 93, and a rocker arm 97. The first rack 91 meshes with the gear 93, one end of the rocker arm 97 is fixedly connected to the gear 93, a pushing part 512 is disposed on the first rack 91, and a cutting blade 51 is disposed on the rocker arm 97. For example... Figure 6f The toggle slide 971, toggle shaft 515 and guide rail structure 944 are removed, and the cutting blade 51 is connected (e.g. fixed) to the swing arm 97. When the cutting mechanism of the print head 20 or the cutting blade moves relative to each other, the pusher 34 pushes the pusher part 512, which in turn pushes the first rack 91 to move along the first direction and drives the gear 93 to rotate. The gear 93 drives the swing arm 97 to rotate and drives the cutting blade 51 to move toward the print head 20 to cut the printing material 23 on the print head.

[0099] Or, such as Figure 6b , Figure 6c , Figure 6d , Figure 6e and Figure 6f In this configuration, the pushing part 512 may be located inside the housing 94, and a first through hole 941 may be provided on the side of the housing 94 facing the print head 20. The pushing member 34 on the print head may be a columnar structure that can pass through the first through hole 941 to push the pushing part 512. Figure 6f The diagram also illustrates a protective plate structure at the cutting blade 51 and a second through hole 942 for the cutting blade 51 to pass through during cutting. Additionally, as... Figure 6a or Figure 6b As shown, the pusher can also be the surface of the housing on the print head, for example, by using the surface of the housing to directly push the pusher 512 on the first rack 91 (such as the end face of the first rack 91 facing the print head 20, or...). Figure 6bThe pusher 512 extending outward from the first through hole 941 or the pusher 512 on the timing belt 94 (e.g., the pusher 512 extending outward from the first through hole 941) ... Figure 6e The central pusher 512 is extended to extend beyond the first through hole 941. It should be noted that the rocker arm can also be called a rocker arm, and this name does not limit the specific structure.

[0100] The relative movement between the print head 20 and the cutting structure 50 or the cutting blade 51 includes the print head 20 moving along a first direction, the cutting structure 50 or the cutting blade 51 moving along a second direction, or the print head 20 and the cutting structure 50 or the cutting blade 51 moving towards each other simultaneously, wherein the first direction movement is opposite to the second direction; of course, the first direction and the second direction can also be set at an angle. Alternatively, the pusher 34 pushes the pusher 512 along the first direction to drive the cutting blade 51 to move along the second direction through a transmission mechanism, wherein the first direction movement is opposite to the second direction; of course, the first direction and the second direction can also be set at an angle. Each guide rail structure can adopt a guide rail slider structure, a linear guide rail and linear bearing structure, or a sliding guide structure with matching grooves and protrusions, or other structures that can achieve guidance.

[0101] Additionally, a triggering component can be installed on the print head. When the print head approaches the cutting mechanism, the triggering component can activate a sensor on the cutting mechanism, causing the drive mechanism of the cutting mechanism to extend (move out or swing out) the cutting blade to cut the printing material on the print head. After cutting the printing material, the cutting blade can retract and reset. This prevents accidental or human-induced extension of the cutting blade, making it safer.

[0102] Example 7, as Figure 7c , Figure 7d , Figure 4 or Figure 2a As shown, the cutting mechanism also includes a switching mechanism, which is used to switch the cutting blade between the working position and the retracted position. When cutting, the switching mechanism moves or swings the cutting blade to the working position. After cutting, the switching mechanism can move or swing the cutting blade to the retracted position. Figure 7c and Figure 7d In the cutting mechanism 50, the cutting blade 51 is mounted on the swing arm 68, which is mounted on the output shaft of the drive mechanism 54. The drive mechanism can drive the cutting blade 51 to swing via the swing arm 68, which is shown in the figure as swinging vertically (through the Z-axis plane) (or swinging around the horizontal axis). When cutting is required, the drive mechanism 54 drives the swing arm 68 to swing to the extended state (working position). Figure 7c As shown, this allows the cutting blade 51 to enter the reachable area or printing area of ​​the print head 20, facilitating the movement of the print head to the cutting position of the cutting mechanism. When cutting is not required, the drive mechanism 54 drives the swing arm 68 to swing to the retracted state (retracted position), as shown. Figure 7dAs shown, this allows the cutting blade to move away from the reachable area or printing area of ​​the print head 20, thus avoiding interference between the print head and the cutting blade that limits the printable range of the print head and increasing the size of the printable model. By swinging vertically, or by swinging the cutting blade around a horizontal axis perpendicular to the direction of movement of the print head and the cutting blade, the cutting blade can penetrate deeply into the printing area when switched to the working position, and when switched to the retracted state, the cutting blade can not only move out of the printing area, but also the cutting blade and the swing arm are vertically positioned, occupying little space. In addition, during the switching process, the distance between the printing platform 71 and the print head can be increased first, for example, by moving the printing platform 71 away from the print head and downward, and then switching can be performed, thus avoiding interference between the cutting blade and the printing platform 71 during the switching process.

[0103] Figure 4 The diagram also illustrates that the cutting mechanism 50 can be mounted on the moving arm 65, allowing the cutting mechanism to move towards or away from the print head. For example, when cutting is required, the cutting mechanism can move towards the print head to the working position, then the print head moves to the cutting position of the cutting mechanism, and then the cutting blade and the print head move towards each other. For example, if the print head moves towards the cutting blade, the cutting blade cuts the printing material on the print head. After cutting, the moving arm can also drive the cutting blade away from the print head to the retracted position. Figure 2a The shaft 67 can also be driven to rotate by the drive mechanism 54 (not shown in the figure), that is, to swing in the horizontal direction (XY plane) (or swing around the vertical axis) as shown in the figure, thereby driving the cutting blade 51 to swing. When cutting is required, the drive mechanism 54 drives the cutting blade 51 to swing to the ready-to-cut state (working position), as shown in the figure. When cutting is not required, the drive mechanism 54 drives the cutting blade 51 to swing to the retracted state (retracted position).

[0104] Can Figure 7c , Figure 7d , Figure 4 or Figure 2a The drive mechanism 54 is mounted on the frame of the printing device, or connected to the guide rail on which the print head slides, or slides on a vertical guide rail (Z-direction). The guiding direction of the vertical guide rail is perpendicular to the relative movement direction of the print head and the cutting mechanism or the cutting blade, with a deviation of no more than ±45°. The movement of the cutting mechanism or the cutting blade along the vertical guide rail facilitates its movement with the print head along the Z-direction (vertical direction), reducing the displacement of the print head to the cutting position of the cutting mechanism or the cutting mechanism (or the cutting blade) to the cutting position of the print head during cutting. Additionally... Figures 9a to 9d The cutting mechanism shown can also implement the solution of this embodiment.

[0105] Example 8, as Figure 2a , Figure 2b , Figure 3a , Figure 7b , Figure 7c , Figure 7d , Figure 9a As shown, the cutting mechanism also includes a buffer mechanism for sliding along the direction of the external force or keeping the cutting blade stationary to buffer the force when the cutting blade or the cutting mechanism is subjected to excessive external force (meaning the external force on the cutting mechanism is greater than a set value); and / or, the cutting mechanism is equipped with a sensor for detecting the displacement or force of the cutting blade during the cutting process.

[0106] During the cutting process, when the print head moves towards the cutting blade, if the cutting blade is subjected to excessive external force, it can move away from the print head to buffer the force. Alternatively, the cutting mechanism also includes a drive mechanism to drive the cutting blade. When the drive mechanism drives the cutting blade towards the print head during cutting, if the cutting blade is subjected to excessive external force, the force causing the cutting blade to move away from the print head and the drive mechanism driving the cutting blade towards the print head cancel each other out, allowing the cutting blade to remain stationary for force buffering. Or...

[0107] The buffer mechanism includes a guide section, a limiting section, and a buffer elastic element. The cutting blade can move along the guide section, and the elastic force of the buffer elastic element pushes the cutting blade against the limiting section. When the cutting blade is subjected to excessive external force, the cutting blade overcomes the elastic force of the buffer elastic element and moves away from the limiting section to buffer the force; or...

[0108] The buffer mechanism includes a swing shaft, a limiting part, and a buffer elastic element. The cutting blade can swing around the swing shaft. The elastic force of the buffer elastic element pushes the cutting blade against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade overcomes the elastic force of the buffer elastic element and swings away from the limiting part to buffer the force; or...

[0109] The buffer mechanism includes a guide section, a limiting section, a buffer elastic element, and a trigger element. The cutting blade can move along the guide section. The trigger element is connected to the cutting blade. The elastic force of the buffer elastic element pushes the cutting blade against the limiting section. When the cutting blade is subjected to an external force exceeding a preset value, the cutting blade overcomes the elastic force of the buffer elastic element and moves away from the limiting section, thus moving the trigger element to trigger the sensor; or...

[0110] The buffer mechanism includes a swing shaft, a limiting part, a buffer elastic element, and a trigger element. The cutting blade can swing around the swing shaft. The trigger element is connected to the cutting blade. The elastic force of the buffer elastic element pushes the cutting blade against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade overcomes the elastic force of the buffer elastic element and swings away from the limiting part, causing the trigger element to move together to trigger the sensor; or...

[0111] The sensor can be a strain gauge or force sensor to detect the force on the cutting blade during the cutting process; alternatively, the sensor can be a Hall sensor, photoelectric sensor, limit switch, travel switch or potentiometer.

[0112] Alternatively, during the cutting process, when the cutting blade and the print head move relative to each other, if the force or displacement of the cutting blade exceeds a preset value, the sensor on the cutting mechanism is triggered.

[0113] like Figure 2a , Figure 2b and Figure 3a As shown, the cutting mechanism 50 also includes a buffer elastic element 58, which presses the cutting blade 51 against the limiting part 55 for positioning, maintaining it in the cutting working state. Or as... Figure 2a The cutting blade 51 shown is mounted on the swing arm 68, which can rotate around the shaft 67. The buffer elastic element 58 can be a coil spring sleeved on the shaft 67. The elastic force of the buffer elastic element 58 drives the cutting blade 51 to remain in the cutting working state. The swing arm 68 or the cutting blade 51 can be limited by a limiting part (not shown in the figure) to maintain the cutting working state. During normal cutting, the force of the cutting blade 51 cutting the printing material is not greater than the elastic force provided by the buffer elastic element 58. When the print head moves towards the cutting blade 51, the cutting blade 51 can remain stationary during the cutting process. When the cutting blade is subjected to excessive external force during the cutting process, for example, if the printhead notch 24 is not aligned with the cutting blade but other parts of the printhead are pressing against the cutting blade 51, then when the printhead moves towards the cutting blade, it will exert a large external force on the cutting blade. When this external force exceeds the elastic force of the buffer elastic element 58, the printhead 20 will push the cutting blade 51 to move in the direction of the external force to buffer the force, and the cutting blade will move away from the limiting part 55. For example, as shown in the figure, the cutting blade 51 and the protective structure 52 can move together along the guide part 56. Then the movement of the cutting blade 51 can trigger the sensor 57, for example, by moving closer to the sensor 57, or the sensor 57 is normally triggered by the drive mechanism 54. When the drive mechanism moves away from the printhead or the cutting blade, the triggering of the sensor 57 is eliminated. Both of these methods can be understood as triggering the sensor 57 (forward triggering and reverse triggering), which can then trigger an alarm and stop the cutting process. Figure 2a As shown, a potentiometer-type sensor 57 can also be set. For example, the rotating shaft of the potentiometer can be coaxially connected with the shaft 67. By detecting the rotation angle of the shaft 67, the displacement of the cutting blade 51 can be detected, and abnormal cutting processes of the cutting blade can also be detected and alarmed.

[0114] Figure 7bAs shown, the buffer elastic element 58 pushes the drive mechanism 54 against the limiting part 55 with its elastic force. During normal cutting, the force exerted by the cutting blade 51 on the printing material is not greater than the elastic force provided by the buffer elastic element. During the cutting process, the drive mechanism 54 can remain stationary, only the cutting blade moves. When the cutting blade is subjected to excessive external force during cutting, for example, if the print head notch 24 is not aligned with the cutting blade but other parts of the print head push against the cutting blade 51, the reaction force provided by the cutting blade when the drive mechanism 54 drives the cutting blade can be greater than the elastic force of the buffer elastic element 58. The drive mechanism 54 overcomes the elastic force of the buffer elastic element and moves away from the print head or the cutting blade to buffer the force, and will move away from the limiting part 55. Then the drive mechanism 54 can trigger the sensor 57. For example, the drive mechanism moves closer to the sensor 57 to trigger the sensor 57, or the sensor 57 is normally triggered by the drive mechanism 54. When the drive mechanism moves away from the print head or cutter, the triggering of the sensor 57 is eliminated. Both of the above methods can be understood as triggering the sensor 57 (forward triggering and reverse triggering), and then an alarm can be triggered, and the cutting process can be stopped.

[0115] Figure 7c and Figure 7d As illustrated, the buffer elastic element 58 springs the drive mechanism 54 to its normal position. For example, the drive mechanism 54 can slide along the guide portion 56. The guide portion 56 can be a guide shaft (as shown in the figure) or a guide rail and slider, allowing the drive mechanism 54 and the cutting blade 51 to move together along the guide portion 56, for example, in the direction in which the print head and the cutting blade move relative to each other during the cutting process. When the guide portion 56 is a shaft, the buffer elastic element 58 can also be fitted onto the shaft. A limiting part 55 (not shown in the figure) can be provided at the end of the shaft. The buffer elastic element 58 moves the drive mechanism 54 and the cutting blade 51 to the state limited by the limiting part 55, i.e., the normal position. In this normal position, i.e., the normal working state, the cutting mechanism can perform a normal cutting process or switch between the working position and the retracted position. When preparing to cut, the cutting mechanism switches to the working position, such as... Figure 7cAs shown, during normal cutting, the force exerted by the cutting blade 51 on the printing material is no greater than the elastic force provided by the buffer elastic element 58. The cutting blade 51 remains stationary as the print head moves towards it for cutting. However, if the cutting blade is subjected to excessive external force during cutting, such as when the print head notch 24 is not aligned with the cutting blade and other parts of the print head are pressing against it, a large external force will be exerted on the cutting blade as the print head moves towards it. When this external force exceeds the elastic force of the buffer elastic element 58, the print head 20 will push the cutting blade 51 and the drive mechanism 54 to move in the direction of the external force to buffer the force. The cutting blade 51 and the drive mechanism 54 will then move away from the limiting part 55. Then, the movement of the cutting blade 51 and the drive mechanism 54 can trigger the sensor 57. For example, the sensor 57 is triggered when it approaches the print head, or the sensor 57 is normally triggered by the drive mechanism 54. When the drive mechanism moves away from the print head or the cutting blade, the triggering of the sensor 57 is eliminated. Both of these methods can be understood as triggering the sensor 57 (forward triggering and reverse triggering), which can then trigger an alarm and stop the cutting process. The diagram also shows that a base 59 can be provided. For example, the two ends of the buffer elastic element 58 are connected to the drive mechanism 54 or its mounting base, and the other end is connected to the base 59. The sensor 57 can be mounted on the base 59, and the guide part 56 can also be connected to the base (e.g., fixed). The base 59 can be connected to the frame of the 3D printing device (e.g., fixed), or slidably connected to the vertical guide rail, or connected to the guide rail on which the print head slides. Similar methods are also possible. Figure 9a As shown, the buffer elastic element can be set between the cutting blade 51 and the swing arm 68 or the drive mechanism 56. In this way, when the cutting blade 51 is subjected to excessive external force, the cutting blade 51 can move relative to the swing arm 68 in the direction of the external force to buffer the force. At the same time, the sensor 57 can also be set on the swing arm 68. The movement of the cutting blade 51 relative to the swing arm 68 can trigger the sensor 57.

[0116] Figure 9aThe cutting mechanism also includes an execution mechanism that can drive the cutting blade to move in a corresponding plane, and a buffer mechanism. The buffer mechanism includes a buffer elastic element and a limiting part. The limiting part is set on the execution mechanism and can move together with the moving head or the second guide rail driven by the execution mechanism. The elastic force of the buffer elastic element presses the cutting blade against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade overcomes the elastic force of the buffer elastic element and swings or moves away from the limiting part or the moving head to buffer the force. The buffer elastic element 58 presses the cutting blade 51 against the limiting part 55 for positioning, keeping it in the cutting working state. When the cutting blade 51 moves towards the cutting position of the print head, the cutting blade and the print head move towards each other to cut. During normal cutting, the force of the cutting blade 51 cutting the printing material is not greater than the elastic force provided by the buffer elastic element 58, and the distance between the cutting blade 51 and the execution mechanism (or drive mechanism) can remain unchanged. When the cutting blade is subjected to excessive external force during the cutting process, such as when the print head notch 24 is not aligned with the cutting blade but other parts of the print head are pressing against the cutting blade 51, a large external force is generated on the cutting blade when it moves towards the print head. When this external force is greater than the elastic force of the buffer elastic member 58, the print head 20 will push the cutting blade 51 to tilt and move in the direction of the external force to buffer the force. At the same time, the actuator (or drive mechanism) (such as the moving arm 65) drives the cutting blade 51 to move towards the print head, so that the cutting blade will overcome the buffer elastic member 58 and move relative to the actuator to buffer the force, and can leave the limiting part 55. The movement of the cutting blade 51 can then trigger the sensor 57 mounted on the actuator or drive mechanism (such as the moving arm 65). For example, the sensor 57 may be triggered when the cutting blade moves closer to it, or the sensor 57 may normally be triggered by the cutting blade 51. When the cutting blade 51 moves away from the print head or the cutting blade moves away, the triggering of the sensor 57 is eliminated. Both of these methods can be understood as triggering the sensor 57 (forward triggering and reverse triggering), which can then trigger an alarm and stop the cutting process. The cutting blade 51 in the figure can also be similar. Figure 2a As shown, it is rotatably mounted on the actuator (such as the moving arm 65) via shaft 67. When the cutting blade is subjected to excessive force, the cutting blade can rotate around shaft 67 to buffer the force. Figure 9b , Figure 9c and Figure 9d A similar buffer mechanism can also be provided, for example, a limiting part is provided on the moving head 69, the elastic force of the buffer elastic member is directed towards the cutting edge of the cutting blade and the cutting blade 51 is pressed against the limiting part.

[0117] Sensor 57 can be various sensor types such as Hall effect sensors, photoelectric switches, limit switches, stress sensors, or potentiometers. It can also be equipped with trigger elements corresponding to the respective sensor types, connected to the cutting blade 51 or the drive mechanism 54, for example... Figure 7c and Figure 7d The trigger 571 is connected to the drive mechanism 54. When the cutting blade 51 is pushed by multiple external forces, causing the drive mechanism 54 to move along the direction of the external force (moving away from the print head), the trigger 571 will trigger the sensor 57.

[0118] Example 9, as Figures 9a to 9d or Figure 4 As shown. The cutting blade is mounted on a drive mechanism, i.e., an actuator, that can move in the XY plane, or on a drive mechanism, i.e., an actuator, that can move in a plane passing through the Z axis. When cutting, the actuator drives the cutting blade to the cutting position of the print head, and then the cutting blade and the print head move closer to each other (moving towards each other). The cutting blade cuts the printing material at the notch on the print head.

[0119] like Figure 9a and Figure 9b As shown, the cutting blade 51 is mounted on a movable head that can move along the setting directions of the first guide rail 61 and the second guide rail 62. The first guide rail 61 is set along the first direction, and the second guide rail 62 is set along the second direction. A movable seat 66 is slidably mounted on the first guide rail 61, and the second guide rail 62 is slidably mounted on the movable seat 66 along the second direction. The first direction and the second direction are set at an angle. By moving the movable head along the first direction and the second direction, the cutting blade 51 can be moved toward the printing material 23 on the print head to cut the printing material. In this way, when cutting the printing material, the print head can stop moving and wait for cutting, or it can perform printing work.

[0120] Or, such as Figure 9c As shown, the cutting blade 51 is mounted on a moving head driven by an actuator. The actuator includes a first link 73 and a second link 74 arranged in parallel. One end of the first link 73 and the second link 74 is rotatably connected to a moving base 66, and the other end is rotatably connected to a moving head 69. The moving base 66 can slide along the first guide rail 61. The rotation of the first link 73 and the second link 74, in conjunction with the movement of the moving base 66, can drive the moving head 69 to swing or translate in the corresponding plane, thereby moving the cutting blade 51 toward the printing material on the print head 20 to cut the printing material. In this way, when cutting the printing material, the print head can stop moving and wait for cutting, or it can continue to perform printing work. Ideally, the first link 73 and the second link 74 are arranged in parallel with each other.

[0121] Or, such as Figure 9dAs shown, the cutting blade 51 is mounted on the moving head 69, which is driven to move by the actuator. The actuator includes a first connecting rod 73, whose two ends are rotatably connected to the moving base 66 and the moving head 69 respectively, and a second connecting rod 74, whose two ends are rotatably connected to the auxiliary moving base 661 and the auxiliary moving head 691 respectively. The moving base 66 and the auxiliary moving base 661 can slide along the first guide rail 61, and the auxiliary moving head 691 can slide along the auxiliary guide rail fixed to the moving head 69. The first connecting rod 73 and the second connecting rod 74 are arranged crosswise and are hinged at the cross-connection point by a pivot 671. The rotation of the first connecting rod 73 and the second connecting rod 74, in conjunction with the movement of the moving base 66 and the auxiliary moving base 661, can drive the moving head 69 to move in the corresponding plane, thereby moving the cutting blade 51 toward the printing material on the print head 20 to cut the printing material. In this way, when cutting the printing material, the print head can stop moving and wait for cutting, or it can perform printing work.

[0122] Or, such as Figure 9c and Figure 9d As shown, the cutting blade is mounted on a moving head driven by an actuator. The actuator includes a first synchronous belt 85, a second synchronous belt 86, a central wheel 87, and a first connecting rod 73. One end of the first connecting rod 73 is rotatably connected to the moving head 69, and the other end of the first connecting rod 73 is driven to the central wheel 87. The other end of the first connecting rod 73 is also rotatably connected to a moving seat 66, which can slide along a first guide rail 61. The first synchronous belt 85 and the second synchronous belt 86 mesh with the central wheel 87 on opposite sides of the central wheel 87 and drive the central wheel 87 along the direction of the first guide rail 61, respectively. By driving the first synchronous belt 85 and the second synchronous belt 86 to rotate, the central wheel 87 can be driven to rotate and move along the direction of the first guide rail 61. In turn, the first connecting rod 73 is rotated through the transmission of the central wheel 87, and the moving seat 66 moves along the first guide rail 61, thereby realizing that the moving head carries the cutting blade 51 to move towards the printing material on the print head 20 to cut the printing material.

[0123] The drive mechanism 54 can be a servo motor, servo motor or electric motor, or it can drive the cutting blade 51 or the protective structure 52b through a rocker arm, connecting rod, lead screw, synchronous belt drive or gear drive.

[0124] Figures 9a to 9d The diagram illustrates that the cutting blade, driven by the actuator, moves to the cutting position on the print head. Through its relative movement towards the print head, the cutting blade cuts the printing material on the print head. Figure 9aThe actuator, as illustrated, includes a second guide rail 62, a movable seat 66, and a first guide rail 61. The cutting blade 51 can be mounted on the second guide rail 62 or on a movable head 69 at the end of the second guide rail. The second guide rail 62 can move relative to the movable seat 66, and the movable seat 66 can move along the first guide rail 61. The direction of movement of the second guide rail 62 is at an angle to the direction of movement of the movable seat 66 constrained by the first guide rail 61; ideally, they are perpendicular. Alternatively, a protective structure, such as a protrusion 52, can be provided on the cutting blade 51 to prevent accidental contact with the cutting blade by the operator. The print head 20 includes a hot end 10 and a notch 24. The print head can move relative to the printing platform 71. The printing material 23 is conveyed to the hot end 10 via a conveying pipe through the notch 24. When the printing material 23 needs to be cut, the second guide rail 62 moves along the moving seat 66 and along the first guide rail 61, allowing the cutting blade 51 to move in the XY plane. This allows the cutting blade 51 to move to the cutting position on the print head, and then the cutting blade 51 moves towards the print head. For example, the cutting blade can be driven by the second guide rail 62 to move towards the notch 24 on the print head to cut the printing material 23. Alternatively, the print head can move towards the cutting blade 51. The cutting blade can also be set to swing on the moving head, such as... Figure 9b As shown, the cutting blade 51 can rotate around the second rotating shaft 513, which is mounted on the second guide rail 62 or on the moving head 69 at the end of the second guide rail. When the cutting blade 51 moves towards the print head and contacts the pusher 34 on the print head, one end of the cutting blade 51 is pushed to rotate around the second rotating shaft 513, allowing the cutting edge of the other end of the cutting blade 51 to extend into the notch (gap) on the print head to cut the printing material. Alternatively, the second guide rail 62 can also be a swing arm, for example... Figure 8 The swing arm 68 is rotatably mounted on the second guide rail 92 via shaft 67. The cutting blade 51 is mounted on this swing arm, allowing the cutting blade 51 to move in the XY plane and reach the cutting position of the print head to cut the printing material. This can further form a shape such as... Figure 9c or Figure 9d The implementation plan. For example... Figure 9cAlternatively, an actuator with a parallelogram-shaped rocker arm structure can be used, including a first link 73 and a second link 74. The two links can be arranged in parallel. One end of each of the first link 73 and the second link 74 is rotatably connected to the movable seat 66, and the other end is rotatably connected to the movable head 69. For example, the shaft on the first link 73, which is rotatably connected to the movable seat 66, can be connected to the central wheel 87, for example, coaxially fixed. The central wheel 87 is rotatably mounted on the movable seat 66 and can drive the first link 73 to rotate around the axis of the central wheel 87. The central wheel 87 is rotatably mounted on the movable seat 66 and can slide along the first guide rail 61 with the movable seat 66. The cutting blade 51 is mounted on the movable head 69. By controlling the sliding of the movable seat 66 along the first guide rail and controlling the rotation of the central wheel 87, the free movement of the movable head 69 in the XY plane can be achieved, and the cutting blade 51 mounted on the movable head 69 can move freely in the XY plane. Figure 9d As shown, the two ends of the first connecting rod 73 are rotatably connected to the moving seat 66 and the moving head 69, respectively. The two ends of the second connecting rod 74 are rotatably connected to the auxiliary moving seat 661 and the auxiliary moving head 691, respectively. The auxiliary moving seat 661 can also slide along the first guide rail 61. The auxiliary moving head 691 can slide along a guide rail fixed to the moving head 69 and parallel to the first guide rail 61. The first connecting rod and the second connecting rod are arranged to cross each other, and a rotating shaft 671 is provided at the intersection so that the first connecting rod 73 and the second connecting rod 74 can rotate around the rotating shaft 671. The cutting blade is provided on the moving head 69. The first connecting rod 73 can also be rotatably connected to the moving base 66 and then to the central wheel 87. The central wheel 87 is rotatably mounted on the moving base 66 and can drive the first connecting rod 73 to rotate around its axial direction. Thus, by controlling the movement of the moving base 66 along the first guide rail 61 and the rotation of the central wheel 87, the movement of the moving head 69 in the XY plane can be controlled, allowing the cutting blade 51 connected to the moving head to move freely in the XY plane. For example, when the print head needs to cut the printing material, the moving head 69 can carry the cutting blade 51 and move it towards the print head beforehand to the cutting position. Then, the cutting blade and the print head move relative to each other, for example, the cutting blade moves towards the print head or the print head moves towards the cutting blade, and the cutting blade cuts the printing material on the print head. More preferably, during the printing process, the cutting blade 51 can be driven by the drive mechanism to move with the print head, and at the same time, the cutting blade 51 moves toward the notch 24 of the print head to cut the printing material. Then, the drive mechanism (actuator) drives the cutting blade 51 to move outside the area where the print head is printing, so as to avoid interfering with the printing process of the print head. Figure 9c and Figure 9dThe central wheel 87 can also be driven by a linear angular coupling mechanism, such as a first synchronous belt 85 and a second synchronous belt 86. The central wheel is a synchronous belt pulley, and the first synchronous belt 85 and the second synchronous belt 86 mesh with the central wheel 87 on opposite sides of the central wheel 87, respectively driving the central wheel 87 along the direction of the first guide rail 61. By controlling the speed and direction of movement of the first synchronous belt 85 and the second synchronous belt 86 along the first guide rail 61 at their meshing points with the central wheel 87, free control of the combined motion of the rotation of the central wheel 87 and its movement along the first guide rail 61 can be achieved, thereby achieving free control of the movement of the moving head 69 and the cutting blade 51 in the XY plane. Furthermore, the first synchronous belt 85 and the second synchronous belt 86 can also be closed synchronous belts, and can be stretched by two synchronous belt pulleys respectively. They can also be driven by motors 81 and 82 respectively to drive the corresponding synchronous belt pulleys to drive the closed first synchronous belt 85 and the second synchronous belt 86 to reciprocate. Furthermore, guide wheels can be provided on both sides of the center wheel 87 along the direction of the first guide rail 61, corresponding to the first synchronous belt 85 and the second synchronous belt 86 respectively. The guide wheels are in contact with the back of the corresponding synchronous belt, thereby increasing the meshing length between the corresponding synchronous belt and the center wheel.

[0125] Alternatively, the cutting blade can be mounted on the printer frame or fixed to the guide rail for the print head sliding. The actuator (drive mechanism) of the cutting mechanism has a moving head. When cutting is required, the actuator drives its moving head to the position of the cutting blade, engaging the cutting blade with the moving head. Then, the moving head drives the cutting blade to the cutting position on the print head. The cutting blade moves towards the print head, cutting the printing material on the print head. The moving head can then drive the cutting blade back to its mounting position, returning it to its original position. The moving head can be separated from the cutting blade. A positioning structure can be provided between the moving head and the cutting blade to ensure precise mounting of the cutting blade onto the moving head or precisely mounting it back into its original position each time. The engagement of the cutting blade and the moving head can be achieved using magnetic adsorption or a mechanical clamping mechanism.

[0126] In this way, the print head does not need to be moved to the cutting position of the cutting mechanism during the cutting process. Instead, the cutting mechanism can be moved to the vicinity of the print head. For example, the cutting blade can be moved to the vicinity of the print head in advance to cut the printing material 23. The cutting process is faster and saves more time. In addition, when printing continuous fiber materials or metal wire materials, the continuous fibers or metal wires on the print head are still connected to the model on the printing platform during the cutting process. Therefore, the print head cannot be moved to the cutting mechanism for cutting. So the cutting mechanism needs to drive its cutting blade to the cutting position of the print head to cut the printing material.

[0127] In various embodiments of this application, a heating assembly 32 can be provided on the printhead 20 to heat the heating section 12 of the hot end 10. Alternatively, heat dissipation fins 31 can be provided to dissipate heat from the heat dissipation section of the hot end. Each printhead 20 may include a detachable hot end 10, such as... Figure 2d The schematic hot end may also include an extrusion port 11 and a feed pipe. The feed pipe includes, in sequence, a heating section 12, a throat 13, and a heat dissipation section 14. The heat dissipation section 14 has a heat dissipation surface that contacts the heat dissipation surface of the heat dissipation fins on the print head for heat dissipation (e.g., Figure 2d As shown), the heat dissipation surface of the heat dissipation fins on the print head can be laterally open. Alternatively, heat dissipation fins 31 can be provided on the heat dissipation section 14 (e.g., Figure 1c As shown, a heating block 15 can also be provided on the heating section 12. The extrusion port 11 is connected to the heating section 12. A positioning part 18 can also be provided on the heating section 12 on each hot end 10 for positioning the hot end on the print head. After the printing material 23 is cut off, the hot end 10 below the cut can be replaced or the printing material 23 above the cut can be replaced. Heating elements, heat dissipation fins, cooling fans or filament feeders 22 can also be provided on the hot end.

[0128] In various embodiments of this application, if the print head moves along the X-axis guide rail, the cutting mechanism can be configured to maintain a fixed connection with the guide rail, such as in a 3D printer (3D printing device) with a gantry frame structure (I3 structure) or a cantilever 3D printer (e.g., Figure 3b The cutting mechanism shown can be connected to the X-axis assembly track frame, or to a rectangular coordinate system 3D printer (such as...). Figures 2a to 2c When the XY-axis frame (as shown) can move along the Z-axis, the cutting mechanism can be connected to the XY-axis frame, or the cutting mechanism can be fixedly mounted on the printer frame. In summary, the structure of this fused deposition modeling (FDM) 3D printer can be varied, such as Cartesian coordinate, gantry frame, polar coordinate, or sliding polar coordinate (e.g.) Figure 8 As shown), or a parallel-arm delta structure (such as...) Figure 4 (As shown) etc. are all acceptable.

[0129] In various embodiments of the present invention, the cutting mechanism may be set on the frame of the printing device, or the cutting mechanism may be connected to the guide rail on which the print head is slidably mounted, or the cutting mechanism may be slidably mounted on a vertical guide rail (Z direction), the guiding direction of the vertical guide rail being perpendicular to the relative movement direction of the print head and the cutting mechanism or the cutting blade, with a deviation of no more than ±45°.

[0130] During cutting, the print head moves and / or swings to the cutting position of the cutting mechanism. The print head moves towards the cutting blade of the cutting mechanism, or the cutting blade of the cutting mechanism moves towards the print head. The cutting blade cuts the printed material at the notch of the print head. The relative movement direction between the print head and the cutting mechanism can be parallel to the XY plane, perpendicular to the Z-axis, perpendicular to the axis of the feed pipe on the print head, or perpendicular to the axis of the extrusion port of the print head. Figures 2a to 2c In the embodiment shown, the positions of the cutting mechanism 50 and the cutting blade 51 can be fixed, and they can be fixed on the frame of the printing device. The print head 20 can be moved and adjusted in the XY plane (for example, the print head 20 can move along the first guide rail 61 and the second guide rail 62 or by...). Figure 4 The parallel arm mechanism shown is driven or moved by Figure 8 The sliding polar coordinate structure shown can be used to move the print head 20 to the cutting position, and then the print head 20 can be moved towards the cutting blade 51 to complete the cutting of the printed material. Alternatively, it can be... Figures 3a to 3c As shown, the cutting mechanism can be fixedly connected to the first guide rail 61, and the print head 20 moves along the first guide rail 61 toward the cutting mechanism and the cutting blade to complete the cutting of the printing material.

[0131] A quick-change heat exchanger structure can also be installed on the print head. For example, the heating section of the heating end 10 is pressed onto the heating assembly on the print head by the lower clamping mechanism 41. Figures 2a to 2c As shown, or as Figures 6a to 6e As shown, the heat dissipation section of the hot end can also be pressed onto the heat dissipation fins 31 of the print head by the upper clamping mechanism 42. Of course, the heat dissipation fins 31 can also be set on the heat dissipation section of the hot end, thus eliminating the need for the upper clamping mechanism 42. Figure 1a and Figure 1c , Figures 3a to 3c As shown. Figures 6a to 6e In this design, the lower clamping mechanism 41 on the print head 20 is oscillating. An elastic element presses the lower clamping mechanism 41 against the hot end 10, fixing the hot end to the print head 209. The print head 20 may also include two heat dissipation fins 31 that can oscillate around various shafts 301. Each heat dissipation fin 31 may be equipped with a spring 302 (such as a coil spring fitted onto the shaft 301) to press both heat dissipation fins 31 against the heat dissipation section of the hot end 10. This allows the heat dissipation section of the hot end to contact the two heat dissipation fins 31 for heat dissipation transmission and to be clamped by the two heat dissipation fins 31. This structure allows for reliable installation of the hot end onto the print head and easy removal of the hot end.

[0132] Example 10: The present invention also provides a cutting method for a 3D printing device with cutting function. The cutting method of the present invention includes the following steps:

[0133] When the print head needs to cut the printing material, move the print head to the cutting position of the cutting mechanism or move the cutting blade of the cutting mechanism to the cutting position of the print head.

[0134] The print head and the cutting mechanism or the cutting blade on the cutting mechanism move towards each other, and the cutting blade cuts the print material.

[0135] In one specific embodiment of the present invention

[0136] The print head moves to the cutting position of the cutting mechanism, and then the print head moves toward the cutting mechanism so that the cutting blade inserts into the notch of the print head to cut the printing material, or the cutting mechanism drives the cutting blade to insert into the notch of the print head to cut the printing material.

[0137] Alternatively, when the print head moves toward the cutting mechanism or the cutting blade mounted on the cutting mechanism, the pusher on the print head pushes the pusher on the cutting mechanism and drives the cutting blade toward the print head through the transmission mechanism of the cutting mechanism to cut the printing material on the print head; after the pusher separates from the pusher, the cutting blade is reset by the action of the third elastic member;

[0138] Alternatively, the cutting blade of the cutting mechanism is driven by the actuator to move to the corresponding cutting position on the print head, and then the cutting blade moves toward the notch of the print head or the print head moves toward the cutting blade to cut the printing material;

[0139] Alternatively, during the printing process, the cutting blade of the cutting mechanism is driven by the actuator to move to the corresponding cutting position on the print head. The cutting blade moves synchronously with the print head, and at the same time, it moves towards the notch of the print head to cut the printed material.

[0140] Alternatively, when cutting is to be performed, the cutting blade of the cutting mechanism is moved or swung to the working position by the switching mechanism. After the cutting is completed, the cutting blade is moved or swung back to the retracted position by the switching mechanism.

[0141] Alternatively, when cutting is to be performed, the print head and the print platform move away from each other, and then the cutting blade of the cutting mechanism is moved or swung to the working position by the switching mechanism. After the cutting is completed, the cutting blade is moved or swung back to the retracted position by the switching mechanism.

[0142] Alternatively, during the cutting process, when the cutting blade and the print head move relative to each other, if the force or displacement of the cutting blade exceeds a preset value, the sensor on the cutting mechanism is triggered, and the cutting process is stopped.

[0143] Furthermore, after the cutting blade cuts the printing material in the print head, the printing material and hot end on the print head are replaced.

[0144] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A 3D printing device with cutting function, characterized in that, It includes a print head and a cutting mechanism that can move relative to each other, wherein the cutting mechanism is provided with a cutting blade; During cutting, the relative movement between the print head and the cutting mechanism or the cutting blade causes the cutting blade to cut the print material on the print head.

2. The 3D printing device with cutting function as described in claim 1, characterized in that, The printhead includes an extrusion port and a feed line for conveying printing material to the extrusion port, the feed line having a notch to expose the printing material; During cutting, the print head moves to the cutting position of the cutting mechanism and moves toward the cutting blade of the cutting mechanism so that the cutting blade cuts the printed material at the notch; Alternatively, the print head moves to the cutting position of the cutting structure, and the cutting mechanism or the cutting blade moves toward the print head so that the cutting blade cuts the printing material at the notch; Alternatively, the cutting blade of the cutting mechanism moves to the cutting position of the print head, and the print head moves toward the cutting blade so that the cutting blade cuts the printing material at the notch; Alternatively, the cutting blade of the cutting mechanism moves to the cutting position of the print head, and the cutting mechanism or the cutting blade moves toward the print head so that the cutting blade cuts the printing material at the notch.

3. The 3D printing device with cutting function as described in claim 1, characterized in that, The cutting blade is provided with a protective structure, which includes a shielding part that blocks the front of the cutting blade.

4. The 3D printing device with cutting function as described in claim 3, characterized in that, The shielding portion is a raised structure located on both sides in front of the blade along the blade direction, forming an opening between the two raised structures that exposes the blade. The width of the opening is adapted to the size of the printing material, or... The cutting mechanism further includes a first driving mechanism that is driven to be connected to the protective structure. The first driving mechanism drives the protective structure to adjust between a blocking position and an open position, so that the blocking part blocks the blade part or the blocking part moves away to expose the blade part. or, The shielding part is positioned in front of the blade portion, and has a slit allowing the cutting blade to pass through. The cutting mechanism further includes a second driving mechanism driven by the cutting blade. The second driving mechanism can drive the cutting blade to extend out of the slit to perform cutting, and after cutting, drive the cutting blade to retract to the rear of the shielding part; or... The shielding part is positioned in front of the blade, and has a slit that allows the cutting blade to pass through. A first elastic element is connected to the shielding part. When the print head moves toward the cutting mechanism or the cutting blade, or when the cutting mechanism or the cutting blade moves toward the print head, the printing material pushes the shielding part to allow the cutting blade to extend from the slit to complete the cutting. When the printing material separates from the shielding part, the shielding part resets under the action of the first elastic element. or, The shielding part is positioned in front of the blade, and has a slit that allows the cutting blade to pass through. A first elastic element is connected to the shielding part. A driving element is provided on the print head corresponding to the shielding part. When the print head moves toward the cutting mechanism or the cutting blade, or when the cutting mechanism or the cutting blade moves toward the print head, the driving element pushes the shielding part to allow the cutting blade to extend from the slit to complete the cutting. When the driving element separates from the shielding part, the shielding part resets under the action of the first elastic element. or, The shielding portion is a raised structure located on both sides in front of the blade along the blade direction, forming an opening between the two raised structures that exposes the blade. Opposing protrusions are provided inwardly at the opening, and the width between the opposing protrusions is adapted to the size of the printing material; or... The cutting blade is assembled with the protective structure, or the cutting blade is integrally formed with the protective structure, or the cutting blade is embedded into the protective structure by means of internal injection molding.

5. The 3D printing device with cutting function as described in claim 3, characterized in that, The shielding part is a protruding structure provided on both sides of the blade, wherein at least one protruding structure is movably connected to the cutting blade, and the two protruding structures can be moved closer together to block the blade or moved away to expose the blade by means of adjustment.

6. The 3D printing device with cutting function as described in claim 5, characterized in that, The protruding structure that is movably connected is rotatably mounted on the cutting mechanism via a first rotating shaft. The cutting mechanism is also provided with a second elastic element. Under the action of the second elastic element, the two protruding structures can come together to block the blade portion. Alternatively, the convex structure that is movably connected is movably disposed on the cutting mechanism, and the cutting mechanism is also provided with a second elastic element, which allows the two convex structures to come together and block the blade portion under the action of the second elastic element.

7. The 3D printing device with cutting function as described in claim 6, characterized in that, The protruding structure of the movable connection is provided with a toggle part; the print head is provided with a toggle member corresponding to the toggle part; when the print head moves toward the cutting mechanism or the cutting blade or the cutting mechanism or the cutting blade moves toward the print head, the toggle member can toggle the corresponding toggle part to make the two protruding structures move away from each other and thus expose the blade part; or, The protruding structure initially has a gap and / or the protruding structure is provided with a guide slope. When the print head moves toward the cutting mechanism or the cutting blade, or when the cutting mechanism or the cutting blade moves toward the print head, the printing material on the print head can be squeezed in through the gap or the guide slope, causing the movable protruding structure to move away from another protruding structure, so that the printing material can come into contact with the blade of the cutting blade and complete the cutting of the printing material.

8. The 3D printing device with cutting function as described in claim 1, characterized in that, The cutting mechanism includes a buffer mechanism, which is used to allow the cutting blade to move along the direction of the external force or to keep the cutting blade stationary when the cutting blade is subjected to excessive external force to buffer the force. And / or, the cutting mechanism is equipped with a sensor for detecting the displacement or force of the cutting blade during the cutting process.

9. The 3D printing device with cutting function as described in claim 8, characterized in that, When the print head moves toward the cutting blade during the cutting process, if the cutting blade is subjected to excessive external force, the cutting blade can move away from the print head to buffer the force. Alternatively, the cutting mechanism may also include a drive mechanism to drive the cutting blade. When the drive mechanism drives the cutting blade toward the print head during the cutting process, if the cutting blade is subjected to excessive external force, the external force driving the cutting blade to move away from the print head and the drive mechanism driving the cutting blade to move toward the print head cancel each other out, allowing the cutting blade to remain stationary. The force buffer is achieved through the relative movement between the drive mechanism and the cutting blade. or, The buffer mechanism includes a guide, a limiting part, and a buffer elastic element. The cutting blade can move along the guide. The elastic force of the buffer elastic element pushes the cutting blade against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade overcomes the elastic force of the buffer elastic element and moves away from the limiting part to buffer the force. or, The buffer mechanism includes a swing shaft, a limiting part, and a buffer elastic element. The cutting blade can swing around the swing shaft. The elastic force of the buffer elastic element pushes the cutting blade against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade overcomes the elastic force of the buffer elastic element and swings away from the limiting part to buffer the force. or, The buffer mechanism includes a guide portion, a limiting portion, a buffer elastic element, and a trigger element. The cutting blade can move along the guide portion. The trigger element is connected to the cutting blade. The elastic force of the buffer elastic element pushes the cutting blade against the limiting portion. When the cutting blade is subjected to an external force exceeding a preset value, the cutting blade overcomes the elastic force of the buffer elastic element and moves away from the limiting portion to buffer the force, and moves the trigger element together to trigger the sensor; or... The buffer mechanism includes a swing shaft, a limiting part, a buffer elastic element, and a trigger element. The cutting blade can swing around the swing shaft. The trigger element is connected to the cutting blade. The elastic force of the buffer elastic element pushes the cutting blade against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade overcomes the elastic force of the buffer elastic element and swings away from the limiting part to buffer the force, and moves the trigger element together to trigger the sensor; or... The cutting mechanism also includes an execution mechanism, which can drive the cutting blade to move in a corresponding plane. The buffer mechanism includes a buffer elastic element and a limiting part. The limiting part is disposed on the execution mechanism. The elastic force of the buffer elastic element pushes the cutting blade against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade overcomes the elastic force of the buffer elastic element and slides or swings away from the limiting part relative to the limiting part or the moving head to buffer the force. The sensor can be a strain gauge or a force sensor to detect the force on the cutting blade during the cutting process; or the sensor can be a Hall sensor, a photoelectric sensor, a limit switch, a travel switch, or a potentiometer. Alternatively, during the cutting process, when the cutting blade and the print head move relative to each other, if the force or displacement of the cutting blade exceeds a preset value, the sensor on the cutting mechanism is triggered.

10. The 3D printing device with cutting function as described in claim 1, characterized in that, The cutting mechanism includes a switching mechanism, which is used to switch the cutting blade between a working position and a retracted position. When cutting, the switching mechanism moves or swings the cutting blade to the working position. After cutting, the switching mechanism moves or swings the cutting blade to the retracted position.

11. The 3D printing device with cutting function as described in claim 10, characterized in that, The switching mechanism includes a drive mechanism and a swing arm, the swing arm being drively connected to the output shaft of the drive mechanism, and the cutting blade being mounted on the swing arm; or... The cutting mechanism further includes a buffer mechanism, which is used to allow the cutting blade to move along the direction of the external force or to keep the cutting blade stationary when the cutting blade is subjected to excessive external force, thus buffering the force; and / or, the cutting mechanism is equipped with a sensor to detect the displacement or force of the cutting blade during the cutting process; or... The switching mechanism includes a drive mechanism, a swing arm, a buffer elastic element, and a limiting part. The swing arm is connected to the output shaft of the drive mechanism. The cutting blade is slidably or swingably mounted on the swing arm. The limiting part is connected to the swing arm. The buffer elastic element acts on the cutting blade to abut against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade moves away from the limiting part relative to the limiting part to buffer the force. or, The switching mechanism includes a drive mechanism, a swing arm, a buffer elastic element, a limiting part, and a sensor. The swing arm is drivenly connected to the output shaft of the drive mechanism. The cutting blade is slidably or swingably mounted on the swing arm. The limiting part is connected to the swing arm. The buffer elastic element acts on the cutting blade to abut against the limiting part. When the cutting blade is subjected to excessive external force, the cutting blade moves away from the limiting part relative to the limiting part to buffer the force. The sensor is used to detect the force on the cutting blade or its displacement relative to the limiting part. The switching mechanism includes a drive mechanism, a swing arm, a buffer elastic element, a limiting part, and a base. The swing arm is drivenly connected to the output shaft of the drive mechanism. The cutting blade is disposed on the swing arm. The limiting part is connected to the base. The buffer elastic element acts on the drive mechanism and causes the drive mechanism to abut against the limiting part. When the cutting blade is subjected to excessive external force, the drive mechanism moves away from the limiting part relative to the limiting part to buffer the force. or, The switching mechanism includes a drive mechanism, a swing arm, a buffer elastic element, a limiting part, a base, and a sensor. The swing arm is drivenly connected to the output shaft of the drive mechanism. The cutting blade is mounted on the swing arm. The limiting part is connected to the base. The buffer elastic element acts on the drive mechanism and causes the drive mechanism to abut against the limiting part. When the cutting blade is subjected to excessive external force, the drive mechanism moves away from the limiting part to buffer the force. The sensor is used to detect the force on the cutting blade or the displacement of the drive mechanism relative to the limiting part.

12. The 3D printing device with cutting function as described in claim 1, characterized in that, The cutting mechanism is provided with a transmission mechanism, a pushing part and a third elastic element, and the print head is provided with a pushing element corresponding to the pushing part; When the print head moves relative to the cutting mechanism or the cutting blade, the pusher pushes the pusher and drives the cutting blade toward the print head through the transmission mechanism to cut the printing material on the print head; After the pushing member separates from the pushing part, the cutting blade is reset under the action of the third elastic member.

13. The 3D printing device with cutting function as described in claim 12, characterized in that, The transmission mechanism is a swing-type transmission mechanism, including a swing arm and a second rotating shaft. The swing arm is rotatably mounted on the cutting mechanism via the second rotating shaft. The cutting blade and the pushing part are spaced apart on the swing arm. When the print head moves relative to the cutting mechanism or the cutting blade, the pushing part pushes the pushing part to drive the cutting blade towards the print head or swing around the second rotating shaft towards the print head to cut the printing material on the print head. The cutting blade is inclined. Alternatively, the portion of the pusher that contacts the pusher part is an inclined surface; Alternatively, the direction in which the cutting blade cuts the printing material is opposite to or at an angle to the direction of relative movement between the print head and the cutting mechanism or the cutting blade. Alternatively, the swing arm can be assembled with or integrally formed with the cutting blade; Alternatively, the cutting mechanism includes a guide rail structure, and the rocker arm actuates the cutting blade so that the cutting blade can slide along the guide rail structure; Alternatively, the cutting mechanism includes a guide rail structure, the pusher pushes the pusher part to slide along the guide rail structure, and the pusher part can move the swing arm to swing around the second rotating axis; Alternatively, it may include a secondary cutting blade, a secondary pushing part, and a secondary swing arm disposed opposite to the cutting blade. The secondary cutting blade and the secondary pushing part are spaced apart on the secondary swing arm, which can also rotate around the second pivot. The cutting mechanism is also provided with a third elastic element corresponding to the secondary cutting blade. The print head is provided with a pushing member corresponding to the secondary pushing part. When the print head moves relative to the cutting mechanism or the cutting blade, the pushing member pushes the pushing part and the secondary pushing part, causing the cutting blade and the secondary cutting blade to rotate around the second pivot, so that the blades of the cutting blade and the secondary cutting blade swing towards each other to achieve shearing cutting of the printing material. After the pushing member separates from the pushing part and the secondary pushing part, the cutting blade and the secondary cutting blade are reset under the action of the corresponding third elastic element.

14. The 3D printing device with cutting function as described in claim 12, characterized in that, The transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, and a second rack. The first rack and the second rack mesh with the gear on opposite sides of the gear. The pushing part is disposed on the first rack, and the cutting blade is disposed on the second rack. When the print head moves relative to the cutting mechanism or the cutting blade, the pushing part pushes the pushing part, thereby pushing the first rack to move along a first direction and driving the gear to rotate. The gear drives the second rack to move along a second direction and drives the cutting blade to move toward the print head to cut the printing material on the print head. Alternatively, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, and a second rack, and also includes a housing. The first rack and the second rack mesh with the gear on opposite sides of the gear, respectively. The pushing part is disposed on the first rack, and the cutting blade is disposed on the second rack. The third elastic element is a compression spring with one end abutting against the housing and the other end abutting against the pushing part or the first rack. Alternatively, the third elastic element is a tension spring with one end connected to the housing and the other end connected to the second rack or the cutting blade. The gear is rotatably disposed on the housing via a rotating shaft. Alternatively, the cutting mechanism may further include a housing, on which the gear is rotatably mounted via a shaft, and on which guide rail structures are respectively provided on both sides of the housing opposite to the gear, with the first rack and the second rack respectively slidingly engaging with the two guide rail structures; Alternatively, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, and a second rack. The gear includes a large gear and a small gear coaxially fixedly connected. The pitch circle diameter of the large gear is larger than that of the small gear. The pushing part is disposed on the first rack, and the cutting blade is disposed on the second rack. The first rack meshes with the small gear on a first side of the gear, and the second rack meshes with the large gear on a second side of the gear. The first side and the second side are two sides opposite to the gear along a direction perpendicular to the gear axis. Alternatively, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, and a second rack. The gear includes a large gear and a small gear coaxially fixedly connected, and the small gears are respectively arranged on both sides of the large gear along the axis of the gear. The pitch circle diameter of the large gear is larger than that of the small gear. The pushing part is arranged on the first rack, and the cutting blade is arranged on the second rack. The first rack is divided into two parts and meshes with the two small gears on the first side of the gear. The second rack meshes with the large gear on the second side of the gear. The first side and the second side are opposite sides of the gear along a direction perpendicular to the gear axis. Alternatively, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, and a second rack. The gear includes a large gear and a small gear coaxially fixedly connected. The pitch circle diameter of the large gear is larger than that of the small gear. The pushing part is disposed on the first rack, and the cutting blade is disposed on the second rack. The first rack meshes with the large gear on a first side of the gear, and the second rack meshes with the small gear on a second side of the gear. The first side and the second side are two sides opposite to the gear along a direction perpendicular to the gear axis. Alternatively, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, and a second rack. The gear includes a large gear and a small gear coaxially fixedly connected, and the small gears are respectively arranged on both sides of the large gear along the axis of the gear. The pitch circle diameter of the large gear is larger than that of the small gear. The pushing part is arranged on the first rack, and the cutting blade is arranged on the second rack. The first rack meshes with the large gear on the first side of the gear, and the second rack is divided into two parts and meshes with the two small gears respectively on the second side of the gear. The first side and the second side are two sides of the gear along a direction perpendicular to the gear axis. The transmission mechanism is a synchronous belt transmission mechanism, including a synchronous belt, two synchronous pulleys, and a housing. The two synchronous pulleys tension the synchronous belt. The pushing part is disposed on the synchronous belt portion on the first side of the synchronous belt opposite to the two synchronous pulleys. The cutting blade is disposed on the synchronous belt portion on the second side of the synchronous belt opposite to the two synchronous pulleys. When the print head moves relative to the cutting mechanism or the cutting blade, the pushing part pushes the synchronous belt to rotate around the two synchronous pulleys. When the synchronous belt portion on the first side moves along the first direction, it drives the synchronous belt portion on the second side to move along the second direction and drives the cutting blade to move toward the print head to cut the printing material on the print head. Alternatively, the transmission mechanism is a synchronous belt transmission mechanism, including a synchronous belt, two synchronous pulleys, and a housing. The two synchronous pulleys tension the synchronous belt. The pushing part is disposed on the synchronous belt portion on the first side of the synchronous belt opposite to the two synchronous pulleys. The cutting blade is disposed on the synchronous belt portion on the second side of the synchronous belt opposite to the two synchronous pulleys. The third elastic element is a compression spring with one end abutting against the housing and the other end abutting against the pushing part, or the third elastic element is a tension spring with one end connected to the housing and the other end connected to the synchronous belt portion on the second side of the two synchronous pulleys or connected to the cutting blade. The two synchronous pulleys are rotatably disposed on the housing via rotating shafts. Alternatively, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, and a rocker arm. The first rack meshes with the gear, one end of the rocker arm is fixedly connected to the gear, the pushing part is disposed on the first rack, and the cutting blade is disposed on the rocker arm. When the print head moves relative to the cutting mechanism or the cutting blade, the pushing part pushes the pushing part, thereby pushing the first rack to move along a first direction and driving the gear to rotate. The gear drives the rocker arm to rotate and drives the cutting blade to move toward the print head to cut the printing material on the print head. Alternatively, the transmission mechanism is a rack and pinion transmission mechanism, including a first rack, a gear, a rocker arm, and a guide rail structure. The first rack meshes with the gear, one end of the rocker arm is fixedly connected to the gear, and the pushing part is disposed on the first rack. The rocker arm can push the cutting blade to slide along the guide rail structure. When the print head moves relative to the cutting mechanism or the cutting blade, the pushing part pushes the first rack to move along a first direction and drive the gear to rotate. The gear drives the rocker arm to rotate and pushes the cutting blade to slide along the guide rail structure toward the print head to cut the printing material on the print head. Alternatively, the cutting mechanism may further include a housing, on which a first through hole and a second through hole are provided. The first through hole is for the pushing part or the pushing member to pass through, and the second through hole is for the cutting blade to pass through. In the cutting state, the cutting blade extends out of the second through hole, and in the reset state, the cutting blade retracts into the second through hole. Alternatively, the cutting mechanism may further include a housing and a base, with the transmission mechanism disposed within the housing and a buffer mechanism and / or a sensor disposed between the housing and the base; Alternatively, the relative motion includes the print head moving along a first direction, the cutting mechanism or cutting blade moving along a second direction, or the print head and the cutting mechanism or cutting blade moving towards each other simultaneously, wherein the first direction movement and the second direction movement are opposite; Alternatively, the pusher pushes the pusher in a first direction, which in turn drives the cutter to move in a second direction via the transmission mechanism, wherein the first direction movement and the second direction movement are opposite; Alternatively, the pusher may be a columnar structure or a housing surface disposed on the print head.

15. The 3D printing device with cutting function as described in claim 1, characterized in that, The cutting mechanism is mounted on the frame of the 3D printing device, or the cutting mechanism is connected to a guide rail on which the print head slides, or the cutting mechanism slides on a vertical guide rail, the guiding direction of which is perpendicular to the relative movement direction of the print head and the cutting mechanism or the cutting blade, with a deviation of no more than ±45°; or... During cutting, the print head moves to the cutting position of the cutting mechanism, and the print head moves toward the cutting blade of the cutting mechanism or the cutting blade of the cutting mechanism moves toward the print head. The cutting blade cuts the printing material at the notch of the print head. Alternatively, the cutting blade is mounted on an actuator that can move in the XY plane. When cutting, the actuator drives the cutting blade to the cutting position of the print head, and then the cutting blade and the print head move closer to each other. The cutting blade cuts the printing material at the notch of the print head. Alternatively, the cutting mechanism may further include a second driving mechanism connected to the cutting blade drive, the second driving mechanism driving the cutting blade to move toward the printing material on the print head to cut the printing material; Alternatively, the relative movement direction between the print head and the cutting mechanism is parallel to the XY plane or perpendicular to the Z-axis direction, or perpendicular to the axis of the feed pipe on the print head or perpendicular to the axis of the extrusion port of the print head. Alternatively, the cutting blade is mounted on a movable head that can move along the directions of the first guide rail and the second guide rail. The first guide rail is set along a first direction, and the second guide rail is set along a second direction. A movable seat is slidably mounted on the first guide rail, and the second guide rail is slidably mounted on the movable seat along the second direction. The first direction and the second direction are set at an angle. By moving the movable head along the first direction and the second direction, the cutting blade can be moved toward the printing material on the print head to cut the printing material. Alternatively, the cutting blade is mounted on a moving head driven by an actuator. The actuator includes a first link and a second link arranged in parallel. One end of the first link and the second link are rotatably connected to a moving base, and the other end is rotatably connected to the moving head. The moving base can slide along a first guide rail. The rotation of the first link and the second link, in conjunction with the movement of the moving base, can drive the moving head to swing or translate in a corresponding plane, thereby moving the cutting blade toward the printing material on the print head to cut the printing material. Alternatively, the cutting blade is mounted on a moving head driven by an actuator. The actuator includes a first connecting rod rotatably connected at both ends to a moving base and a moving head, and a second connecting rod rotatably connected at both ends to a secondary moving base and a secondary moving head. The moving base and the secondary moving base can slide along a first guide rail, and the secondary moving head can slide along a secondary guide rail fixed to the moving head. The first connecting rod and the second connecting rod are arranged crosswise and are hinged at the crosswise connection point by a pivot. The rotation of the first connecting rod and the second connecting rod, in conjunction with the movement of the moving base and the secondary moving base, can drive the moving head to move in the corresponding plane, thereby moving the cutting blade toward the printing material on the print head to cut the printing material. Alternatively, the cutting blade is mounted on a moving head driven by an actuator. The actuator includes a first synchronous belt, a second synchronous belt, a central wheel, and a first connecting rod. One end of the first connecting rod is rotatably connected to the moving head, and the other end of the first connecting rod is drive-connected to the central wheel. The other end of the first connecting rod is also rotatably connected to a moving seat. The moving seat can slide along a first guide rail. The first and second synchronous belts mesh with the central wheel on opposite sides of the central wheel and drive the central wheel along the direction of the first guide rail. By driving the first and second synchronous belts to rotate, the central wheel can be driven to rotate and move along the direction of the first guide rail. This, in turn, causes the first connecting rod to rotate through transmission, and the moving seat moves along the first guide rail, thereby moving the cutting blade toward the printing material on the print head to cut the printing material. Alternatively, the actuator of the cutting mechanism has a moving head. When cutting is required, the actuator drives its moving head to the mounting position of the cutting blade and attaches the cutting blade to the moving head. Then, the moving head drives the cutting blade to the cutting position of the print head. The cutting blade moves towards the print head and cuts the printing material on the print head. Then, the moving head drives the cutting blade back to the mounting position of the cutting blade and puts the cutting blade back in its original position. The moving head separates from the cutting blade. Alternatively, the cutting edge of the cutting blade may be inclined. Alternatively, the print head is equipped with a triggering component. When the print head approaches the cutting mechanism, the triggering component of the print head can trigger the sensor on the cutting mechanism, causing the drive mechanism of the cutting mechanism to drive the cutting blade to extend and cut the printing material on the print head. Alternatively, the relative motion may include the movement of the print head, the movement of the cutting mechanism or the cutting blade, or the simultaneous movement of the print head and the cutting mechanism or the cutting blade.

16. A cutting method for a 3D printing apparatus with cutting function as described in any one of claims 1-15, characterized in that, Includes the following steps: When the print head needs to cut the printing material, the print head is moved to the cutting position of the cutting mechanism or the cutting blade of the cutting mechanism is moved to the cutting position of the print head. The print head moves relative to or towards the cutting mechanism or the cutting blade on the cutting mechanism, and the cutting blade cuts the printing material on the print head.

17. The cutting method of the 3D printing device with cutting function as described in claim 16, characterized in that, The print head moves to the cutting position of the cutting mechanism, and then the print head moves toward the cutting mechanism so that the cutting blade inserts into the notch of the print head to cut the printing material, or the cutting mechanism drives the cutting blade to insert into the notch of the print head to cut the printing material. Alternatively, when the print head moves toward the cutting mechanism or the cutting blade provided on the cutting mechanism, the pusher on the print head pushes the pusher on the cutting mechanism and drives the cutting blade toward the print head through the transmission mechanism of the cutting mechanism to cut the printing material on the print head; after the pusher separates from the pusher, the cutting blade is reset under the action of the third elastic member; Alternatively, the cutting blade of the cutting mechanism is driven by the actuator to move to the corresponding cutting position on the print head, and then the cutting blade moves toward the notch of the print head or the print head moves toward the cutting blade to cut the printing material; Alternatively, during the printing process, the cutting blade of the cutting mechanism is driven by the actuator to move to the corresponding cutting position of the print head. The cutting blade moves synchronously with the print head, and at the same time, the cutting blade moves toward the notch of the print head to cut the printing material. Alternatively, when cutting is to be performed, the cutting blade of the cutting mechanism is moved or swung to the working position by the switching mechanism. After the cutting is completed, the cutting blade is moved or swung back to the retracted position by the switching mechanism. Alternatively, when cutting is to be performed, the print head and the print platform move away from each other, and then the cutting blade of the cutting mechanism is moved or swung to the working position by the switching mechanism. After the cutting is completed, the cutting blade is moved or swung to the retracted position by the switching mechanism. Alternatively, during the cutting process, when the cutting blade and the print head move relative to each other, if the force or displacement of the cutting blade exceeds a preset value, the sensor on the cutting mechanism is triggered, and the cutting process is stopped.

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