Cutting knife for cutting off 3D printing material line, 3D printing head and 3D printer

Abstract

This application provides a cutter, a 3D print head, and a 3D printer for cutting 3D printing filament. The cutter is disposed in the 3D print head, which includes a hot-end assembly and a feed tube connector. The feed tube connector connects to a filament container / rack via a feed tube. The filament container / rack holds the 3D printing filament, which enters the hot-end assembly through the feed tube. The cutter is located between the feed tube connector and the hot-end assembly. The cutter includes a blade body and a protective sleeve. The blade body has a cutting edge, and the protective sleeve covers the outer periphery of the cutting edge. The protective sleeve has a filament hole through which the filament passes, extending along the thickness direction of the protective sleeve. The blade body and the protective sleeve are movably connected, and the cutting edge moves through the filament hole. Implementing this application can improve the safety of the cutter during the cutting process and ensure the safety of the cutter during installation and replacement.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, specifically to a cutter for cutting 3D printing filaments, a 3D printing head, and a 3D printer. Background Technology

[0002] In 3D printing, 3D printers are equipped with cutters to cut the 3D printing filament. However, the cutters used to cut the 3D printing filament in existing technology have poor safety. Utility Model Content

[0003] The purpose of this invention is to provide a cutter, 3D print head, and 3D printer suitable for cutting 3D printing filaments, thereby solving the problem of poor cutter safety in existing 3D printers.

[0004] To achieve the objectives of this utility model, the following technical solution is provided:

[0005] In a first aspect, this utility model provides a cutter for cutting 3D printing filament. The cutter is disposed on a 3D printing head, which includes a hot end assembly and a feed tube connector. The feed tube connector is used to connect a feed hopper / feed rack through a feed tube. The feed hopper / feed rack is used to hold the 3D printing filament, which enters the hot end assembly through the feed tube. The cutter is located between the feed tube connector and the hot end assembly. The cutter includes a blade body and a protective sleeve. The blade body has a cutting edge, and the protective sleeve covers the outer periphery of the cutting edge. The protective sleeve has a filament hole through which the 3D printing filament passes. The filament hole extends through the protective sleeve along its thickness direction. The blade body and the protective sleeve are movably connected, and the cutting edge moves through the filament hole.

[0006] In some embodiments, the protective sleeve includes a first protective plate and a second protective plate spaced apart along the thickness direction, and the blade is disposed between the first protective plate and the second protective plate.

[0007] In some embodiments, the first protective plate and the second protective plate are connected by an arc-shaped transition, and the cross-sectional shape of the protective sleeve along the thickness direction is "U".

[0008] In some embodiments, the cutter further includes a fixing member that penetrates the protective sleeve along the thickness direction, and the cutting edge is located on one side of the wire hole along a direction perpendicular to the thickness direction. The fixing member is rotatably connected to the cutter body so that the cutting edge passes through the wire hole from one side to the other side of the wire hole.

[0009] In some embodiments, the end of the blade away from the fixing member extends out of the protective sleeve, and the end of the blade connected to the fixing member and the end extending out of the protective sleeve are located on both sides of the blade. The 3D printing head also includes a trigger member, and the end of the blade extending out of the protective sleeve is used for transmission connection with the trigger member.

[0010] Secondly, this utility model provides a 3D print head suitable for a 3D printer. The 3D print head includes a feed tube connector, a hot end assembly, and a cutter as described in any one of the embodiments of the first aspect. The cutter is located between the feed tube connector and the hot end assembly. The filament hole is disposed opposite to the feed port of the hot end assembly. The 3D printing filament passes through the filament hole and extends into the feed port of the hot end assembly.

[0011] In some embodiments, the 3D printing head further includes a trigger and a rotating component. The trigger is used to contact the cutting collision component, and the rotating component is rotatably disposed on the 3D printing head. The two opposite ends of the rotating component are respectively connected to the trigger and the blade body.

[0012] In some embodiments, the hot end assembly and the cutter are movable along the direction from the feed tube connector to the hot end assembly; a limiting hole is provided on the rotating member, and the cutter body can be movably extended into the limiting hole.

[0013] In some embodiments, the 3D printing head further includes a reset member connected to the trigger member, the trigger member having a cutting start position and a cutting end position, the reset member driving the trigger member to switch from the cutting end position to the cutting start position.

[0014] In some embodiments, there are two of each of the feed tube connector and the hot end assembly, and two of each of the cutters. One set of the feed tube connector, the hot end assembly, and the cutter forms one set of printing structures, and the other set of the feed tube connector, the hot end assembly, and the cutter forms another set of printing structures. The set of printing structures is movable relative to the other set of printing structures.

[0015] Thirdly, this utility model provides a 3D printer, which includes a housing and a 3D printing head as described in any one of the embodiments of the second aspect, wherein the 3D printing head is movably mounted in the housing.

[0016] In some embodiments, the 3D printer further includes a cutting collision structure installed in the housing, the cutting collision structure including a collision element, and the 3D printing head moving to bring the first trigger element into contact with the collision element.

[0017] The cutting blade for cutting 3D printing filaments provided by this utility model has a protective sleeve on the outside of the blade, and the protective sleeve has a filament hole, so that the blade is hidden in the protective sleeve during cutting, which improves the safety of the cutting blade during the cutting process and also ensures the safety of the cutting blade during installation and replacement. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the appearance of a 3D printer in one implementation method;

[0020] Figure 2 This is a schematic diagram of one implementation of a 3D printer connected to a material hopper via a material tube;

[0021] Figure 3 This is a diagram showing the internal structure of a 3D printing head in one implementation method.

[0022] Figure 4 This is a front view of the first and second hot ends in one embodiment.

[0023] Figure 5 This is a schematic diagram of the lifting and lowering of the first hot end in one implementation method;

[0024] Figure 6 This is an external view of a cutter trigger structure installed on the right side of a 3D printing head, as one embodiment is described.

[0025] Figure 7 This is an appearance diagram of the connection method of the cutter trigger structure in one implementation;

[0026] Figure 8 This is an external view of a cutter trigger structure installed on the left side of a 3D printing head, as one embodiment of the invention.

[0027] Figure 9 This is a top view of a cutting blade before cutting, representing one implementation method.

[0028] Figure 10 This is a top view of a cutting blade after cutting, according to one embodiment.

[0029] Figure 11 This is a side view of the blade and protective sleeve according to one embodiment;

[0030] Figure 12 This is a flowchart of a material cutting method for one implementation.

[0031] Figure 13 This is a mechanical schematic diagram of a cutter triggering structure in one implementation.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100 - 3D printer, 200 - 3D printing line, 300 - material tube, 400 - material hopper;

[0034] 1-Box body, 2-Guide component, 3-3D printing head, 4-Printing platform, 5-Cutting collision structure, 6-Printing space, 7-Connecting frame, 8-Feed tube connector, 8A-First feed tube connector, 8B-Second feed tube connector, 9-Hot end assembly, 9A-First hot end assembly, 9B-Second hot end assembly, 11-Connector mounting base, 11A-Connector mounting base one, 11B-Connector mounting base two, 12-Cutter triggering structure, 13-First trigger component, 14-First rotating component, 15-First cutter, 16-Limiting hole, 17-First reset component, 18-First limiting component, 19-Second trigger component, 20-Second rotating component, 21-Second cutter, 22-Groove, 23-Second reset component, 24-Cutter, 25-Cutter body, 26-Protective sleeve, 27-Cutter blade, 28-Wire hole, 29-First protective plate, 30-Second protective plate, 31-Fixing component;

[0035] 001 - X-axis direction, 002 - Y-axis direction, 003 - Z-axis direction. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0037] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component. Connections include detachable connections and non-detachable connections. For example, a fixed connection can include detachable fixed connections and non-detachable fixed connections, a rotating connection can include detachable rotating connections and non-detachable rotating connections, and a sliding connection can include detachable sliding connections and non-detachable sliding connections. Connections can also be direct connections or indirect connections through a component. For example, a detachable fixed connection means that, in the installed state, the positional relationship between at least two connected objects can be fixed; similar examples include rotating connections, sliding connections, etc.

[0038] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0039] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0040] For some implementation methods, please refer to Figure 1 The 3D printer 100 includes a housing 1, a guide 2, a 3D print head 3, a printing platform 4, and a cutting and collision structure 5. The housing 1 encloses a printing space 6, within which the printing platform 4, guide 2, 3D print head 3, and collision structure are housed. The printing operation of the 3D printer 100 is also completed within the printing space 6. The 3D print head 3 is connected to the guide 2, which moves the 3D print head 3 within the printing space 6 and can move the 3D print head 3 in at least two directions. The 3D print head 3 is the main component for 3D printing; it is used to feed the 3D printing filament 200 and print the filament 200 into a three-dimensional solid. The printing platform 4 supports the three-dimensional solid printed by the 3D print head 3, and the 3D print head 3 ejects the filament onto the printing platform 4 to complete the printing operation.

[0041] In a specific embodiment, please refer to Figure 1 The outer shape of the housing 1 can be a hexahedron (i.e., a cube or a cuboid). The guide 2 can drive the 3D printing head 3 to move back and forth in the X-axis direction 001, the 3D printing head 3 can move left and right along the Y-axis direction 002 on the guide 2, and the printing platform 4 can move up and down along the Z-axis direction 003.

[0042] In a specific embodiment, the guide can also be a gantry structure, comprising a Y-axis beam and two Z-axis columns. The 3D printing head is mounted on the Y-axis beam and can move left and right along the Y-axis direction. The two Z-axis columns are located on both sides of the Y-axis beam and extend along the Z-axis direction, allowing the Y-axis beam to move up and down along the Z-axis columns. The printing platform is located below the Y-axis beam and between the two Z-axis columns. The printing platform can move back and forth along the X-axis direction, allowing the 3D printing head to move three-dimensionally on the printing platform and complete the printing work.

[0043] In a specific embodiment, please refer to Figure 1 and Figure 2The 3D printing head 3 is connected to the hopper 400 via a feed tube 300. The hopper 400 holds the 3D printing filament 200, which is then transported to the 3D printing head 3 for printing via the feed tube 300. The hopper 400 is independently located outside the housing 1 and contains a filament reel on which the 3D printing filament 200 is wound. The feed tube 300 is connected to the hopper 400, through which the 3D printing filament 200 extends. The other end of the feed tube 300 passes through the housing 1 and connects to the 3D printing head 3, thus enabling the 3D printing filament 200 to be transported to the 3D printing head 3.

[0044] For some implementation methods, please refer to Figure 3 and Figure 4 The 3D printing head 3 includes a connecting frame 7, a feed tube connector 8, and a hot end assembly 9. Both the feed tube connector 8 and the hot end assembly 9 are mounted on the connecting frame 7, which is connected to a guide member 2. The connecting frame 7 can move along the Y-axis direction 002, thereby moving the feed tube connector 8 and the hot end assembly 9. The feed tube connector 8 connects to one end of a feed tube 300, and the other end of the feed tube 300 connects to a material container 400. The 3D printing filament 200 is thus transported through the feed tube 300 to the feed tube connector 8. The feed tube connector 8 and the hot end assembly 9 are positioned opposite each other. The feed tube connector 8 guides the 3D printing filament 200 into the hot end assembly 9, which heats the 3D printing filament 200 until it melts and outputs the melted 3D printing filament 200 onto the printing platform 4 for printing.

[0045] For some implementation methods, please refer to Figure 4 and Figure 5 There are two feed tube connectors 8 and two hot end assemblies 9. The two feed tube connectors 8 are designated as first feed tube connector 8A and second feed tube connector 8B, and the two hot end assemblies 9 are designated as first hot end assembly 9A and second hot end assembly 9B. The first feed line is conveyed to the first hot end assembly 9A via the first feed tube connector 8A, and the second feed line is conveyed to the second hot end assembly 9B via the second feed tube connector 8B. The two hot end assemblies 9 can perform printing operations independently.

[0046] In a specific embodiment, please refer to Figure 4 and Figure 5 The first feed pipe connector 8A and the first hot end assembly 9A are installed sequentially along the Z-axis direction 003, with the first hot end assembly 9A installed below the first feed pipe connector 8A. The second feed pipe connector 8B and the second hot end assembly 9B are installed sequentially along the Z-axis direction 003, with the second hot end assembly 9B installed below the second feed pipe connector 8B. The first feed pipe connector 8A and the second feed pipe connector 8B are installed sequentially along the Y-axis direction 002, and the first hot end assembly 9A and the second hot end assembly 9B are installed sequentially along the Y-axis direction 002.

[0047] In a specific embodiment, please refer to Figure 4 and Figure 5 The first feed tube connector 8A is independently connected to one feed tube 300, and the second feed tube connector 8B is independently connected to another feed tube 300. That is, the first feed tube connector 8A and the second feed tube connector 8B can be connected to two different 3D printing feed filaments 200 respectively. Therefore, this utility model provides a 3D printing head 3 capable of using two different 3D printing feed filaments 200 for printing. Optionally, the first feed tube connector 8A and the second feed tube connector 8B can be connected to two 3D printing feed filaments 200 of different colors (or different materials) respectively.

[0048] For some implementation methods, please refer to Figure 4 and Figure 5 The first hot end component 9A is movably connected to the connecting frame 7, and the first hot end component 9A can be raised and lowered along the Z-axis direction 003; the second hot end component 9B is fixedly connected to the connecting frame 7, that is, the second hot end component 9B cannot be raised and lowered along the Z-axis direction 003; the discharge port of the first hot end component 9A and the discharge port of the second hot end component 9B are at different heights along the Z-axis direction 003.

[0049] In a specific embodiment, please refer to Figure 5 The first hot end assembly 9A has a printing position ( Figure 5 (as shown in (1)) and non-printing positions ( Figure 5 As shown in (2), the first hot end component 9A can switch between a printing position and a non-printing position. The printing position of the first hot end component 9A is its position after it has descended relative to the second hot end component 9B, so that the discharge port of the first hot end component 9A is lower than the discharge port of the second hot end component 9B; the non-printing position of the first hot end component 9A is its position after it has risen relative to the second hot end component 9B, so that the discharge port of the first hot end component 9A is higher than the discharge port of the second hot end component 9B.

[0050] In a specific embodiment, the 3D printing head 3 also includes a lifting mechanism. The first hot end component 9A is mounted on the 3D printing head 3 through the lifting mechanism, that is, the first hot end component 9A is movably connected to the connecting frame 7 through the lifting mechanism.

[0051] Optionally, the 3D printing head 3 also includes a connector mounting base 11, wherein the connecting frame 7 and the connector mounting base 11 can be detachably connected, or the connecting frame 7 and the connector mounting base 11 can be integrally formed. The first hot end assembly 9A is liftably connected to the connecting frame 7, the second hot end assembly 9B is fixed to the connecting frame 7, and the connector mounting base 11 covers the outer periphery of the first feed tube connector 8A and the second feed tube connector 8B.

[0052] This invention sets the discharge ports of the first hot-end component 9A and the second hot-end component 9B at different heights along the Y-axis direction 002, which can prevent interference between the first hot-end component 9A and the second hot-end component 9B during printing. It is understood that the first hot-end component 9A is height-adjustable. When the first hot-end component 9A is in the printing position, its discharge port is closer to the printing platform 4 than the discharge port of the second hot-end component 9B. Therefore, during the movement of the 3D printing head 3, the second hot-end component 9B will not touch the printed 3D entity. Similarly, when the first hot-end component 9A is not in the printing position, the discharge port of the second hot-end component 9B is closer to the printing platform 4 than the discharge port of the first hot-end component 9A, and the first hot-end component 9A will not touch the printed 3D entity.

[0053] In some embodiments, the first feed pipe connector 8A and the first hot end assembly 9A are movably connected to the connecting frame 7, and the first feed pipe connector 8A and the first hot end assembly 9A can be raised and lowered simultaneously along the Z-axis direction 003; the second feed pipe connector 8B and the second hot end assembly 9B are fixedly connected to the connecting frame 7, that is, the second feed pipe connector 8B and the second hot end assembly 9B cannot be raised or lowered along the Z-axis direction 003. In a specific embodiment, the first feed pipe connector 8A and the first hot end assembly 9A can be raised and lowered simultaneously, so that the distance between the first feed pipe connector 8A and the first hot end assembly 9A is relatively fixed during the raising and lowering process.

[0054] This utility model features a first feed pipe connector 8A and a first hot end assembly 9A that can be raised and lowered simultaneously. The difference lies in the fact that only the first hot end assembly can be raised and lowered while the first feed pipe connector remains fixed. When the first hot end assembly is raised, the distance between it and the first feed pipe connector shortens, resulting in an operation similar to feeding, making the feed line more prone to overflow. In contrast, this application uses a system where the first hot end assembly 9A and the first feed pipe connector 8A are raised and lowered simultaneously. Therefore, the distance between the three components remains unchanged. Changes in distance from the hopper to the first hot end assembly can be absorbed by the feed pipe, preventing overflow from the first hot end assembly 9A.

[0055] For some implementation methods, please refer to Figure 6 and Figure 7The cutting collision structure 5 includes a collision element, and the 3D printing head 3 also includes a cutting trigger structure 12. The cutting trigger structure 12 includes a first trigger element 13, a first rotating element 14, and a first cutting blade 15. The first trigger element 13 is slidably connected to the body of the 3D printing head 3 and is used to contact the collision element. The first rotating element 14 is rotatably connected to the body of the 3D printing head 3. The two opposite ends of the first rotating element 14 are respectively connected to the first trigger element 13 and the first cutting blade 15. The first cutting blade 15 is disposed between the first material tube connector 8A and the first hot end assembly 9A. The first cutting blade 15 is at least partially rotatable under the drive of the first rotating element 14. The rotation path of the first cutting blade 15 passes through the material inlet of the first hot end assembly 9A.

[0056] In a specific embodiment, please refer to Figure 6 and Figure 7 The first cutter 15 is used to cut the 3D printing filament 200 between the first feed tube connector 8A and the first hot end assembly 9A. After the 3D printing filament 200 is cut, the 3D printing filament 200 in the first feed tube connector 8A and the feed tube 300 can be withdrawn from the 3D printing head 3 to deliver a new 3D printing filament 200 to the first hot end assembly.

[0057] In a specific embodiment, please refer to Figure 6 The first trigger 13 is disposed on the connecting frame 7 and is slidably connected to the connecting frame 7. Optionally, the first trigger 13 passes through the connecting frame 7 along the X-axis direction 001; a first through hole is formed on the connecting frame 7 to accommodate the first trigger 13, and the first trigger 13 passes through the first through hole from the side of the connecting frame 7 facing away from the first hot end assembly 9A and connects to the first rotating member 14. The end of the first trigger 13 away from the first rotating member 14 is used to contact the collision member.

[0058] In a specific embodiment, please refer to Figure 6 The connector mounting base 11 includes a connector mounting base 11A, with a first rotating member 14 disposed on the outer periphery of the connector mounting base 11A and rotatably connected to it. Optionally, the side of the connector mounting base 11A has a rotating shaft, and the middle portion of the first rotating member 14 is rotatably connected to the rotating shaft. Optionally, the side of the connector mounting base 11A has a rotating hole, and the middle portion of the first rotating member 14 forms a rotating shaft, which extends into the rotating hole and is rotatably connected to the connector mounting base 11A. The rotating shaft connected to the first rotating member 14 is disposed between the first trigger member 13 and the first cutter 15.

[0059] In a specific embodiment, please refer to Figure 6In the Z-axis direction 003, the first trigger 13 is located on the side of the first feed tube connector 8A away from the first hot end assembly 9A. The first trigger 13 is movably connected to the first rotating member 14. The end of the first rotating member 14 away from the first trigger 13 is used to connect the first cutter 15, and the first cutter 15 is disposed between the first feed tube connector 8A and the first hot end assembly 9A.

[0060] In a specific embodiment, after the first trigger 13 touches the collision member, the first trigger 13 slides along the X-axis direction 001. The sliding of the first trigger 13 drives the first rotating member 14 to rotate in a clockwise or counterclockwise direction with the pivot point as the center. The first cutter 15 connected to the other end of the first rotating member 14 rotates or moves accordingly under the drive of the first rotating member 14.

[0061] In a specific embodiment, the first cutter 15 is at least partially rotatable under the drive of the first rotating member 14, so that the rotation path of the blade 27 of the first cutter 15 passes through the material port of the first hot end assembly 9A, thereby cutting the 3D printing material line 200 between the first material tube connector 8A and the first hot end assembly 9A.

[0062] The cutting trigger structure 12 provided by this utility model is applicable to a 3D printer 100. It is used to trigger the first cutting blade 15 installed between the first hot end assembly 9A and the first material tube connector 8A in conjunction with the cutting collision structure 5. After the first trigger 13 contacts the collision member, the first trigger 13 can move relative to the body of the 3D printing head 3 to drive the first rotating member 14 to rotate. The first rotating member 14 then drives the first cutting blade 15 to rotate in the plane. The cutting is completed by the rotation path of the first cutting blade 15 through the material inlet. The first trigger 13 achieves linkage steering through the first rotating member 14. Moreover, the first rotating member 14 and the first cutting blade 15 form two force-saving lever structures, so that the cutting collision structure 5 can complete the cutting in conjunction with a small triggering force. This not only improves the smoothness of cutting, but also improves the sensitivity of the cutting process.

[0063] For some implementation methods, please refer to Figure 6 and Figure 7 The first hot-end assembly 9A and the first cutter 15 are movable up and down along the Z-axis direction 003. A limiting hole 16 is provided on the first rotating member 14, and at least part of the first cutter 15 extends into the limiting hole 16. The first cutter 15 is movable within the limiting hole 16 along the axial direction of the first rotating member 14. The first material pipe connector 8A, the first hot-end assembly 9A, and the first cutter 15 can move up and down simultaneously along the Z-axis direction 003. When the first rotating member 14 is not moving up and down in coordination, a limiting hole 16 is required on the first rotating member 14 to accommodate the movement of the first cutter 15.

[0064] In a specific embodiment, please refer to Figure 7 The first rotating member 14 is an elongated rod, and a limiting hole 16 is formed at the end of the first rotating member 14 away from the first trigger member 13. A portion of the first cutter 15 extends into the limiting hole 16. The limiting hole 16 extends along the Z-axis direction 003 on the first rotating member 14, thereby providing space for the first cutter 15 to move when it moves along the Z-axis direction 003. It is understood that the extension length of the limiting hole 16 in the Z-axis direction 003 is not less than the distance the first cutter 15 moves along the Z-axis direction 003.

[0065] In a specific embodiment, please refer to Figure 7 The limiting hole 16 can be a through hole formed on the first rotating member 14, that is, the first cutter 15 passes through the limiting hole 16. The advantage of the limiting hole 16 being a through hole is that a larger portion of the first cutter 15 extends into the limiting hole 16, and the reliability of the first rotating member 14 rotating and driving the first cutter 15 through the hole wall of the limiting hole 16 is higher. The first cutter 15 is also less likely to come out of the limiting hole 16 during the up and down movement.

[0066] In other embodiments, the limiting hole 16 can also be a blind hole formed on the first rotating member 14, that is, the first cutter 15 does not penetrate through the limiting hole 16, and the opening of the limiting hole 16 faces the first cutter 15. The advantage of the limiting hole 16 being a blind hole is that the first cutter 15 will not extend excessively out of the first rotating member 14, which can prevent the part of the first cutter 15 that protrudes through the limiting hole 16 from affecting other components.

[0067] In a specific embodiment, after the first cutter 15 rises within the limiting hole 16, the lever arm between the first cutter 15 and the first rotating member 14 decreases, thereby reducing the torque between the first cutter 15 and the first rotating member 14. For example, during the triggering process of the first cutter 15, the following parameters are included: the force ρ1 applied to the first rotating member 14 by the movement of the first trigger member 13; the lever arm r1 between the rotation axes of the first trigger member 13 and the first rotating member 14; the force ρ2 applied to the first cutter 15 by the rotation of the first rotating member 14; and the lever arm r2 between the rotation axes of the first cutter 15 and the first rotating member 14.

[0068] According to the definition of torque, torque is a vector, defined as the cross product of distance and force. Therefore, L1 = ρ1 × r1, L2 = ρ2 × r2. L1 is the torque between the first trigger 13 and the first rotating component 14, and L2 is the torque between the first cutter 15 and the first rotating component 14. According to the lever principle, L1 = L2. When r2 decreases, L2 will also decrease accordingly, that is, the torque between the first cutter 15 and the first rotating component 14 decreases. With r1 unchanged, ρ1 can decrease, that is, the triggering force required on the side of the first trigger 13 can be reduced. Therefore, the influence of the trigger on the rotating component can be reduced, that is, the force on the rotating component is reduced. At this time, for example, some parts with low stiffness can be selected for the rotating component, and the normal operation of the rotating component can still be maintained.

[0069] This invention features a first cutter 15 that can move up and down along the Z-axis direction 003 with the first hot end assembly 9A, allowing the first cutter 15 to cut material after the first hot end assembly 9A is raised. To facilitate the raising and lowering of the first cutter 15, a limiting hole 16 is provided on the first rotating member 14. The first rotating member 14 is connected to the first cutter 15 through the limiting hole 16, which extends along the axial direction of the first rotating member 14. The first rotating member 14 provides space for the first cutter 15 to move up and down, preventing interference between the movement of the first cutter 15 and the first rotating member 14. Simultaneously, the first cutter 15 can cut material after being raised because it is closer to the axis of rotation of the first rotating member 14, reducing the lever arm of the first rotating member 14 driving the first cutter 15. This reduces the triggering force required on the side of the first trigger member 13, preventing damage to the first rotating member 14 and extending its service life.

[0070] For some implementation methods, please refer to Figure 6 and Figure 7 The cutter trigger structure 12 includes a first reset member 17, which is disposed in at least one of the first trigger member 13, the collision member, and the 3D printing head 3 body. The first trigger member 13 has a cutting start position and a cutting end position. The first reset member 17 drives the first trigger member 13 to switch from the cutting end position to the cutting start position.

[0071] In a specific embodiment, the cutting process of the cutter trigger structure 12 is as follows: the first trigger member 13 slides to drive the first rotating member 14 to rotate, thereby driving the first cutter 15 to rotate and cut the material; during this process, the first trigger member 13 switches from the cutting start position to the cutting end position. Therefore, in order to perform the next cutting, the first trigger member 13 is reset by setting the first reset member 17. The first trigger member 13 drives the first rotating member 14 and the first cutter 15 to move in the opposite direction of the cutting process, so as to achieve the overall reset of the cutter trigger structure 12.

[0072] This utility model adds a first reset member 17 to the cutter trigger structure 12. The first reset member 17 switches the first trigger member 13 from the cutting end position to the cutting start position. In this way, the first trigger member 13 can also drive the first rotating member 14 to rotate to pull the first cutter 15 to reset. After the cutter trigger structure 12 has reached the reset, the cutter trigger structure 12 can wait for the next collision member to cut.

[0073] For some implementation methods, please refer to Figure 6 and Figure 7 The first reset member 17 includes a spring, which is sleeved on the outer periphery of the first trigger member 13. The cutter trigger structure 12 also includes a first limiting member 18, which is connected to the first trigger member 13. The two opposite ends of the spring abut against the first limiting member 18 and the body of the 3D printing head 3, respectively. The first limiting member 18 is connected to the end of the first trigger member 13 away from the first rotating member 14, and the first limiting member 18 is specifically located on the side of the connecting frame 7 facing away from the connector mounting base 11. Thus, the spring is sleeved on the outer periphery of the first trigger member 13, and its two ends can abut against the first limiting member 18 and the connecting frame 7, respectively.

[0074] In a specific embodiment, the collision element is also disposed on the side of the connecting frame 7 facing away from the connector mounting base 11. During the cutting process, the 3D printing head 3 moves toward the collision element so that the first trigger element 13 touches the collision element. The first trigger element 13 moves along the X-axis direction 001 so that the first limiting element 18 approaches the connecting frame 7. At the same time, the first limiting element 18 compresses the spring until the spring is compressed and has elastic potential energy. After the cutting is completed, the 3D printing head 3 moves away from the collision element, the first trigger element 13 is no longer compressed, and the spring, under the restriction of the first limiting element 18, can reverse the movement of the first trigger element 13 to reset.

[0075] This invention uses a spring as the first reset member 17, and cooperates with the first limiting member 18 to limit the spring. When the first trigger member 13 touches the collision member, the collision member connects to the first trigger member 13 and moves along the X-axis direction 001. The spring is compressed in the X-axis direction 001 and has elastic potential energy. After the first trigger member 13 separates from the collision member, since the first trigger member 13 loses its driving force, the spring can drive the first trigger member 13 to return to its original state. The reliability of elastic reset is high, and the spring has a simple structure and is not easily damaged. The cost of the spring and the first limiting member 18 is low, which can reduce the manufacturing cost of the 3D printing head 3.

[0076] In some embodiments, the first reset member 17 includes at least one magnetic element (not shown in the figure), which is disposed on the colliding member, and the first trigger member 13 is made of metal. In a specific embodiment, the magnetic element is disposed on the side of the colliding member facing the first trigger member 13, and the first trigger member 13 can be made of metal. When the first trigger member 13 collides with the colliding member, the colliding member compresses the first trigger member 13 to move along the X-axis direction 001. When the 3D printing head 3 moves away from the colliding member, the first trigger member 13 separates from the colliding member, and the first trigger member 13 is attracted by the magnetic element and moves towards the colliding member, that is, the first trigger member 13 resets under the action of the attractive force.

[0077] In some embodiments, the first reset member 17 includes at least two magnetic elements with opposite magnetic properties (not shown in the figure), one of which is disposed on the colliding member, and the other is disposed on the first trigger member 13. In a specific embodiment, one magnetic element is disposed on the side of the colliding member facing the first trigger member 13, and the other magnetic element is disposed on the side of the first trigger member 13 facing the colliding member. When the first trigger member 13 collides with the colliding member, the two magnetic elements are opposite each other and attract each other. When the 3D printing head 3 moves away from the colliding member, the magnetic element on the first trigger member 13 is attracted by the other magnetic element, and the magnetic element on the first trigger member 13 drives the first trigger member 13 to move and reset.

[0078] In some embodiments, the first reset member 17 includes at least two magnetic elements (not shown in the figure) with identical magnetism. One magnetic element is disposed on the first trigger member 13, and the other magnetic element is disposed near the body of the 3D printing head 3 facing the first trigger member 13. In a specific embodiment, both magnetic elements are located on the side of the connecting frame 7 facing away from the connector mounting base 11. The two magnetic elements are arranged relatively spaced apart along the axial direction of the first trigger member 13. One magnetic element is disposed at the end of the first trigger member 13 away from the first rotating member 14, and the other magnetic element is disposed on the connecting frame 7 and faces the magnetic element opposite it. After the 3D printing head 3 moves away from the collision member, the magnetic element on the first trigger member 13 is repelled by the magnetic element on the connecting frame 7, and the magnetic element on the first trigger member 13 drives the first trigger member 13 to move and reset.

[0079] For some implementation methods, please refer to Figure 8 The cutter triggering structure 12 also includes a second trigger 19, a second rotating member 20, and a second cutter 21. The second rotating member 20 is rotatably connected to the 3D printing head 3. The two opposite ends of the second rotating member 20 are respectively connected to the second trigger 19 and the second cutter 21. The second cutter 21 is disposed between the second material tube connector 8B and the second hot end assembly 9B. At least part of the second cutter 21 can rotate under the drive of the second rotating member 20. The rotation path of the second cutter 21 passes through the material port of the second hot end assembly 9B.

[0080] In a specific embodiment, please refer to Figure 8 The second cutter 21 is used to cut the 3D printing filament 200 between the second feed tube connector 8B and the second hot end assembly 9B. After the 3D printing filament 200 is cut, the 3D printing filament 200 in the second feed tube connector 8B and the feed tube 300 can be ejected from the 3D printing head 3 to deliver a new 3D printing filament 200 to the first hot end assembly.

[0081] In a specific embodiment, please refer to Figure 8 The second trigger 19 is disposed on the connecting frame 7 and is slidably connected to the connecting frame 7. Optionally, the second trigger 19 passes through the connecting frame 7 along the X-axis direction 001; a second through hole is formed on the connecting frame 7 to accommodate the second trigger 19, and the second trigger 19 passes through the second through hole from the side of the connecting frame 7 facing away from the second hot end assembly 9B and connects to the second rotating member 20. The end of the second trigger 19 away from the second rotating member 20 is used to contact the collision member. The second trigger 19 and the first trigger 13 can be spaced apart along the Y-axis direction 002. Optionally, the second trigger 19 and the first trigger 13 can have the same shape.

[0082] In a specific embodiment, please refer to Figure 8 The connector mounting base 11 includes a second connector mounting base 11B, and a second rotating member 20 is disposed on the outer periphery of the second connector mounting base 11B and rotatably connected to the second connector mounting base 11B. Optionally, the connection method between the second rotating member 20 and the second connector mounting base 11B can be the same as the connection method between the first rotating member 14 and the first connector mounting base 11A.

[0083] The second rotating component 20 and the first rotating component 14 can be respectively arranged on opposite sides of the connector mounting base 11 along the Y-axis direction 002.

[0084] The second rotating component 20 and the first rotating component 14 can share the same axis of rotation.

[0085] In a specific embodiment, please refer to Figure 8 The second trigger 19, the second rotating member 20, and the second cutter 21 can be configured in the same way. Therefore, the linkage relationship between the second trigger 19, the second rotating member 20, and the second cutter 21 can be referenced from that of the second trigger 19, etc. However, the difference between the second cutter 21 and the first cutter 15 is that the second cutter 21 is fixed relative to the connecting frame 7. It is understandable that the second feed tube connector 8B and the second hot end assembly 9B are fixedly mounted on the 3D printing head 3, so the second cutter 21 does not need to move.

[0086] In a specific embodiment, please refer to Figure 8The first trigger 13 and the second trigger 19 are at the same height in the horizontal direction (X-axis direction 001 or Y-axis direction 002), and the first trigger 13 and the second trigger 19 share the same collision element. It can be understood that the first trigger 13 and the second trigger 19 are arranged in parallel, and one end of each of the first trigger 13 and the second trigger 19 faces the collision element. Therefore, during the process of the first trigger 13 or the second trigger 19 touching the collision element, the 3D printing head 3 moves in the same way, so the first trigger 13 and the second trigger 19 can share a single collision element.

[0087] In a specific embodiment, the first trigger 13 and the second trigger 19 are relatively fixed and will not move with the lifting and lowering of the first cutter 15. Therefore, the two share a single collision element, which not only reduces costs but also facilitates the movement of the 3D printing head 3. The 3D printing head 3 only needs one movement path to trigger the first trigger 13 or the second trigger 19.

[0088] This invention, by setting a second trigger 19, a second rotating member 20, and a second cutter 21 to be applied to the second material tube connector 8B and the second hot end assembly 9B, allows the cutting process on the second hot end assembly 9B and the first hot end assembly 9A to be controlled independently. Moreover, the cutting transmission method on the second hot end assembly 9B is the same as that on the first hot end assembly 9A, which simplifies the structure of the cutting control on the 3D printing head 3 and simplifies the control logic of the cutting control.

[0089] For some implementation methods, please refer to Figure 8 The second rotating member 20 has a groove 22 that is recessed inward along the axial direction of the second rotating member 20 at the end away from the second trigger member 19. The second feed tube connector 8B, the second hot end assembly 9B, and the second cutter 21 are relatively fixed to the connecting frame 7, that is, the three will not move up and down along the Z-axis direction 003. Therefore, there is no need to open the limiting hole 16 on the second rotating member 20, which can save the space occupied by the second rotating member in the Z-axis direction.

[0090] In a specific embodiment, please refer to Figure 8 The second rotating member 20 is also a long strip rod, and a groove 22 is formed on the side of the second rotating member 20 facing away from the second trigger member 19. Part of the second cutter 21 extends into the groove 22. Due to the restriction of the groove walls on both sides of the groove 22, when the second rotating member 20 rotates and drives the second cutter 21 to move in the xy plane, the second cutter 21 will not disengage from the groove 22.

[0091] This invention provides a groove 22 on the second rotating member 20, into which the second cutter 21 is inserted, thereby engaging the second cutter 21 and the second rotating member 20. The second rotating member 20 can then drive the second cutter 21. Furthermore, since the second hot end assembly 9B does not require lifting or lowering, the groove 22 does not need to be configured as the shape of the limiting hole 16; only the groove 22 needs to be provided, thus simplifying the design and saving space.

[0092] For some implementation methods, please refer to Figure 8 The cutter trigger structure 12 also includes a second reset member 23. The second reset member 23 is disposed in at least one of the second trigger member 19, the collision member and the 3D printing head 3 body. The second trigger member 19 has a cutting start position and a cutting end position. The second reset member 23 drives the second trigger member 19 to switch from the cutting end position to the cutting start position.

[0093] In a specific embodiment, please refer to Figure 8 The second reset member 23 can be the same as the first reset member 17, that is, the second reset member 23 can be a spring, or the second reset member 23 can include a magnetic element. In other embodiments, the second reset member 23 can also be different from the first reset member 17, that is, the first reset member 17 is a spring, and the second reset member 23 can include a magnetic element. It is understood that the first cutter 15 and the second cutter 21 have the same triggering method, and the first trigger member 13 and the second trigger member 19 share a set of cutting collision structure 5, so the reset method of the first trigger member 13 and the second trigger member 19 can also be the same, thereby reducing costs and facilitating the manufacture of the 3D printing head 3.

[0094] For some implementation methods, please refer to Figure 6 The axial direction of the first rotating member 14 is perpendicular to the path of the 3D printing material line 200; the first trigger member 13 is housed in the 3D printing head 3, and the first trigger member 13 is arranged along the axial direction perpendicular to the rotating shaft of the first rotating member 14.

[0095] For some implementation methods, please refer to Figure 8 The axial direction of the rotating shaft of the second rotating member 20 is perpendicular to the path of the 3D printing material line 200; the second trigger member 19 is housed in the 3D printing head 3, and the second trigger member 19 is arranged along the axial direction perpendicular to the rotating shaft of the second rotating member 20.

[0096] With the trigger element placed on the side, the 3D printing head collides with the collision structure from the left and right sides. The cutting trigger structure 12 provided by this utility model uses rotating parts (first rotating part and second rotating part) to change direction, and the trigger element (first trigger element and second trigger element) collides with the cutting collision structure 5 from the rear side. This makes the structure of the 3D printing head 3 more compact and does not require occupying the space on the left and right sides of the 3D printing head 3. Especially for printing heads with hot end components, the size of the entire 3D printing head 3 provided by this utility model is very small.

[0097] For some implementation methods, please refer to Figure 9 and Figure 10 This utility model also provides a cutter 24, which is applied in the 3D printing head 3 in the above embodiments. That is, the first cutter 15 and / or the second cutter 21 provided in the above embodiments both include the structure of the cutter 24. Exemplarily, the structures of the first cutter 15 and the second cutter 21 may be the same or different. This application describes at least one of the first cutter 15 and the second cutter 21 as the cutter 24.

[0098] For some implementation methods, please refer to Figure 9 The cutter 24 includes a cutter body 25 and a protective sleeve 26. The cutter body 25 has a cutting edge 27. The protective sleeve 26 covers the outer periphery of the cutting edge 27. The protective sleeve 26 has a wire hole 28 for the 3D printing filament 200 to pass through. The wire hole 28 extends through the protective sleeve 26 along the thickness direction. The cutter body 25 and the protective sleeve 26 are movably connected. The movement path of the cutting edge 27 passes through the wire hole 28.

[0099] In a specific embodiment, the cutter 24 is flat, and a protective sleeve 26 covers the outer periphery of the cutter body 25 so that the cutting edge 27 is covered by the protective sleeve 26. After the cutter 24 is installed on the 3D printing head 3, the two opposing sides of the cutter 24 face the feed tube connector 8 and the hot end assembly 9, respectively. The filament hole 28 penetrates the protective sleeve 26 so that the 3D printing filament 200 exiting from the feed tube connector 8 can pass through the filament hole 28 and then enter the hot end assembly 9. The cutter body 25 moves through the filament hole 28, thereby performing the cutting operation within the protective sleeve 26.

[0100] In a specific embodiment, the blade body 25 is connected to the rotating component (i.e., the first rotating component 14 or the second rotating component 20) in the above-described embodiments. One end of the blade body 25 extends into the limiting hole 16 mentioned above, and the first rotating component 14 rotates to drive the blade body 25 to move relative to the protective sleeve 26. Optionally, the blade body 25 and the protective sleeve 26 can be rotatably connected, that is, the blade body 25 cuts material by rotation; or, the blade body 25 and the protective sleeve 26 can be slidably connected, that is, the blade body 25 cuts material by translation.

[0101] This utility model provides a protective sleeve 26 outside the blade 27, and the protective sleeve 26 is provided with a wire hole 28, so that the blade 27 is hidden in the protective sleeve 26 for cutting, which improves the safety of the cutter 24 during the cutting process and also ensures the safety of the cutter 24 during installation and replacement.

[0102] For some implementation methods, please refer to Figure 11 The protective sleeve 26 includes a first protective plate 29 and a second protective plate 30 spaced apart along the thickness direction, with a blade 27 disposed between the first protective plate 29 and the second protective plate 30. Both the first protective plate 29 and the second protective plate 30 are flat structures; the first protective plate 29 can be located near the feed tube connector 8, and the second protective plate 30 can be located near the hot end assembly 9. A wire hole 28 passes through the first protective plate 29 and the second protective plate 30, allowing the 3D printing filament 200 to enter from the side of the first protective plate 29 facing away from the second protective plate 30 and then exit from the side of the second protective plate 30 facing away from the first protective plate 29.

[0103] This utility model places the blade 27 between the first protective plate 29 and the second protective plate 30. The first protective plate 29 and the second protective plate 30 protect the blade 27, which not only improves the safety of the user, but also protects the blade 27 and prevents it from being damaged. Moreover, the first protective plate 29 and the second protective plate 30 restrict the offset of the blade body 25 in the thickness direction, ensuring the smoothness of the cutting process and the flatness of the cut line after cutting.

[0104] For some implementation methods, please refer to Figure 10 and Figure 11 The first protective plate 29 and the second protective plate 30 are connected by an arc-shaped transition, and the cross-sectional shape of the protective sleeve 26 along the thickness direction is "U". The outer contour of the first protective plate 29 or the second protective plate 30 can be quadrilateral. The first protective plate 29 and the second protective plate 30 have the same shape. The first protective plate 29 and the second protective plate 30 are connected by an arc-shaped transition on the same side, that is, the cross-sectional shape of the protective sleeve 26 along the thickness direction is "U".

[0105] In a specific embodiment, please refer to Figure 11 The other three sides of the first protective plate 29 are not connected to the second protective plate 30, so that the protective sleeve 26 forms a book-like structure, thereby providing a larger operating space for the blade body 25. The wire hole 28 can be opened in the middle of the protective sleeve 26, and the moving path of the blade 27 passes through the wire hole 28 located in the middle of the protective sleeve 26, thereby cutting the material in the middle of the protective sleeve 26.

[0106] By setting the first protective plate 29 and the second protective plate 30 to an arc-shaped transition connection, this utility model can reduce the exposed sharp parts on the protective sleeve 26, improve the overall safety of the cutter 24, and also prevent the cutter body 25 from moving excessively and coming off the protective sleeve 26 during cutting or resetting.

[0107] For some implementation methods, please refer to Figure 9 and Figure 10 The cutter 24 also includes a fixing member 31, which penetrates the protective sleeve 26 along the thickness direction of the protective sleeve 26. The blade 27 is located on one side of the wire hole 28 along the vertical thickness direction. The fixing member 31 is rotatably connected to the blade body 25 so that the blade 27 passes through the wire hole 28 from one side to the other side of the wire hole 28.

[0108] This utility model sets the blade body 25 as a rotating cutting tool and the fixing part 31 as a fulcrum. It uses the lever principle to increase the cutting force, reduce the triggering force of the blade body 25 during the cutting process, and improve the cutting smoothness.

[0109] In some embodiments, the end of the blade 25 away from the fixing member 31 extends out of the protective sleeve 26. The end of the blade 25 connected to the fixing member 31 and the end extending out of the protective sleeve 26 are located on both sides of the blade 27. The end of the blade 25 extending out of the protective sleeve 26 is used for transmission connection with the trigger member.

[0110] The present invention places the blade 27 in the middle part of the blade body 25, so that the protective sleeve 26 can cover and form protection. The blade body 25 extends out of the protective sleeve 26 not only for transmission, but also increases the power arm when the blade body 25 cuts the material line, so that the blade body 25 and the fixing member 31 form a force-saving lever, further reducing the triggering force of triggering the blade body 25 during the cutting process.

[0111] This utility model also provides a cutting method suitable for 3D printers; please refer to [reference needed]. Figure 12 and Figure 13 Cutting methods include:

[0112] In step S100, the first cutter 15 is moved by the lifting mechanism so that the first cutter 15 is close to the rotating shaft connected to the first rotating member 14.

[0113] In step S200, the first trigger 13 collides with the collision member, causing the first rotating member 14 to drive the first cutter 15 to rotate at least partially and pass through the material port of the first hot end assembly 9A, thereby cutting off the 3D printing material line.

[0114] In a specific embodiment, please refer to Figure 12In order to trigger the first cutter 15, the torque L1 between the first trigger member 13 and the first rotating member 14 must be no less than the torque L2 between the first cutter 15 and the first rotating member 14. Therefore, when r2 decreases, L2 will also decrease accordingly, that is, the torque between the first cutter 15 and the first rotating member 14 decreases. When r1 remains unchanged, ρ1 can decrease, that is, the triggering force required to be applied on the side of the first trigger member 13 can be reduced.

[0115] The cutting method for 3D printers provided by this utility model, by setting the cutting trigger structure of the above embodiment, cuts material through this cutting method. When the first cutter 15 needs to cut material, the lifting structure will drive the first cutter 15 to move to a position close to the rotation axis of the first rotating member 14, and then use the first trigger member 13 to collide with the collision member to trigger the cutting. After the first cutter 15 moves, the lever arm between the rotation axis of the first rotating member 14 and the connection point of the first cutter 15 decreases. Under the condition that the triggering force of the first cutter 15 remains unchanged, the torque between the first rotating member 14 and the first cutter 15 decreases, thereby reducing the triggering force required to be applied on the side of the first trigger member 13. This can also avoid damaging the first rotating member 14 and extend the service life of the first rotating member 14.

[0116] Furthermore, in some feasible implementations, after step S200 is completed, the lifting mechanism can continue to be controlled to move the first cutter 15 away from the rotating shaft connected to the first rotating member 14, meaning the first hot-end assembly remains in the working position. That is, if the first hot-end assembly needs to switch materials, it is first raised to be close to the rotating shaft of the first rotating member, and then the first cutter is used to cut the material. After cutting, the second hot-end assembly is lowered to continue feeding new material, allowing the first hot-end assembly to continue working. This avoids damage to the first rotating member due to excessive force during the cutting process.

[0117] In some embodiments, in step S100, the first cutter 15 is moved by the lifting mechanism so that the first cutter 15 is close to the rotating shaft connected to the first rotating member 14. Specifically, the first hot end assembly 9A is raised by the lifting mechanism to move the first cutter 15 so that the outlet of the first hot end assembly 9A is higher than the outlet of the second hot end assembly 9B.

[0118] In a specific embodiment, the first cutter 15 is disposed on the first hot end assembly 9A and is fixed relative to the first hot end assembly 9A. Therefore, when the lifting mechanism drives the first hot end assembly 9A to rise, it can correspondingly drive the first cutter 15 to move. The first cutter 15 moves to a position close to the rotating shaft of the first rotating member 14 through the limiting hole, thereby reducing the torque.

[0119] The cutting method provided by this utility model includes a lifting mechanism that drives the first hot end component 9A to rise, thereby moving the first cutter 15. While moving the first cutter 15, the first hot end component 9A is also raised, so that when the first hot end component 9A is not needed for printing, the outlet of the second hot end component 9B is closer to the printing platform than the outlet of the first hot end component 9A. The 3D printing head moves, and the first hot end component 9A does not touch the part of the printed three-dimensional entity.

[0120] In some embodiments, in step S100, the lifting mechanism can be used to drive the first hot end component 9A to rise so as to drive the first cutter 15 to move. Specifically, the lifting mechanism can be used to drive the first hot end component 9A and the first material pipe connector 8A to rise simultaneously so as to drive the first cutter 15 to move.

[0121] The cutting method provided by this utility model includes a lifting mechanism that can simultaneously lift the first material tube connector 8A and the first hot end component 9A. After the first hot end component 9A is lifted simultaneously, the 3D printing filament 200 moves along the connecting material tube 300 toward the material bin 400, and the path for the first hot end component 9A to partially accommodate the 3D printing filament 200 becomes shorter. Therefore, the distance between the connecting material tube 300, the first material tube connector 8A, and the first hot end component 9A will not change, and there will be no overflow at the nozzle of the first hot end component 9A.

[0122] In the description of the embodiments of this utility model, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0123] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0124] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A cutter for cutting a 3D printing filament, characterized in that, The cutter is located on the 3D printing head, which includes a hot end assembly and a material tube connector. The material tube connector is used to connect to a material hopper / rack via a material tube. The material hopper / rack is used to hold the 3D printing filament. The 3D printing filament enters the hot end assembly through the material tube. The cutter is located between the material tube connector and the hot end assembly. The cutter includes a blade body and a protective sleeve. The blade body has a cutting edge, and the protective sleeve covers the outer periphery of the cutting edge. The protective sleeve has a wire hole for the 3D printing filament to pass through. The wire hole extends through the protective sleeve along its thickness direction. The blade body and the protective sleeve are movably connected, and the movement path of the cutting edge passes through the wire hole.

2. The cutter of claim 1, wherein The protective sleeve includes a first protective plate and a second protective plate spaced apart along the thickness direction, and the blade is disposed between the first protective plate and the second protective plate.

3. The cutter of claim 2, wherein The first protective plate and the second protective plate are connected by an arc-shaped transition, and the cross-sectional shape of the protective sleeve along the thickness direction is "U".

4. The cutter of claim 1 wherein, The cutter also includes a fixing member that penetrates the protective sleeve along the thickness direction. The blade is located on one side of the wire hole along the direction perpendicular to the thickness direction. The fixing member is rotatably connected to the blade body so that the blade passes through the wire hole from one side to the other side.

5. The cutter of claim 4 wherein, The end of the blade away from the fixing member extends out of the protective sleeve. The end of the blade connected to the fixing member and the end extending out of the protective sleeve are located on both sides of the blade. The 3D printing head also includes a trigger member. The end of the blade extending out of the protective sleeve is used for transmission connection with the trigger member.

6. A 3D printing head suitable for use in a 3D printer, the 3D printing head comprising: The 3D printing head includes a feed tube connector, a hot end assembly, and a cutter as described in any one of claims 1-5. The cutter is located between the feed tube connector and the hot end assembly. The filament hole is disposed opposite to the feed port of the hot end assembly. The 3D printing filament passes through the filament hole and extends into the feed port of the hot end assembly.

7. The 3D printing head of claim 6, wherein, The 3D printing head also includes a trigger and a rotating component. The trigger is used to contact the cutting collision component, and the rotating component is rotatably disposed on the 3D printing head. The two opposite ends of the rotating component are respectively connected to the trigger and the blade body.

8. The 3D printing head of claim 7, wherein, Along the direction from the feed tube connector to the hot end assembly, the hot end assembly and the cutter are movable; a limiting hole is provided on the rotating member, and the cutter body can be movably extended into the limiting hole.

9. The 3D printing head of claim 7, wherein, The 3D printing head also includes a reset component connected to the trigger component. The trigger component has a cutting start position and a cutting end position. The reset component drives the trigger component to switch from the cutting end position to the cutting start position.

10. The 3D printing head of claim 6, wherein, The number of the feed tube connector and the number of the hot end assembly are both two, and the number of the cutter is two. One feed tube connector, the hot end assembly and the cutter form a printing structure, and the other feed tube connector, the hot end assembly and the cutter form another printing structure. The printing structure of one group is movable relative to the printing structure of the other group.

11. A 3D printer characterized by, The 3D printer includes a housing and a 3D printing head as described in any one of claims 6-10, wherein the 3D printing head is movably mounted in the housing.

12. The 3D printer of claim 11, wherein, The 3D printer also includes a cutter push rod structure, which is installed in the housing. The cutter push rod structure includes a cutting collision component, and the 3D printing head moves to cause the trigger component to trigger the movement of the cutter body.

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