Print head assembly and 3D printing device using their

Abstract

A printhead assembly comprising a transfer channel, the transfer channel being used to transfer a consumable, characterized in that the printhead assembly further comprises: a feeding mechanism, wherein the transfer channel is arranged along the axial direction through the feeding mechanism, and wherein the feeding mechanism is used to transfer the consumable material; a hotend, wherein the transfer channel is arranged along the axial direction through the hotend, and wherein the hotend is used to heat the consumable material; a cutting mechanism comprising a cutting element, wherein the cutting element is arranged to be movable with respect to the feed mechanism and the hot end, and wherein the cutting element is designed to penetrate into a portion of the transfer channel located between the feed structure and the hot end and to cut the consumable.

Description

TECHNICAL FIELDThe present application relates to the technical field of 3D printing, and more particularly to a printhead assembly and a 3D printing apparatus using the same.PRIOR ART3D printing technology is a rapid prototyping technology for manufacturing three-dimensional physical objects by layer printing materials based on a digital model file and using bindable materials such as special waxes, metal powders or plastics. Fused deposition rapid prototyping is one of the most important 3D printing technologies. In this technology, a hot melt filament is heated and melted and then extruded from a print head to deposit it on a forming platform or preceding layer of cured material and ultimately create a physical object. In this context, fused deposition moulding (FDM) is a 3D printing technology using thermoplastic polymer materials which are heated and melted by a die and then extruded and incrementally stacked on a printing platform to form a three dimensional object. In multicolor FDM printing technology, a plurality of colored plastic filaments are used in a single print project, so that colored or multicolor 3D models can be printed without the need for postcoloring or painting.However, since the consumables for FDM are typically thermoplastic materials such as wax, ABS (acrylonitrile butadiene styrene terpolymer), nylon, etc., the consumables are heated and melted in the printhead, the printhead moves along the contours of the part cross section and the filling web as it extrudes the melted material, the consumables solidify quickly and coagulate with the surrounding materials to complete the print of the model. However, in the FDM type 3D printers, when color change for printing as well as change of consumables for printing is required, the consumables in the vicinity of the heater block or the nozzle tend to be deformed by melting, and therefore, it is easily possible that the consumables located in the supply passage adhere to the inner wall of the supply passage at the time of return, and the supply passage is blocked, which then causes the printing to be interrupted or the printing fails.As to solve the above-mentioned problems, in order to improve the efficiency of cutting the consumable, improve the quality of the retracted consumable, and increase the success rate of the next feeding, a problem to be superior by those skilled in the art is one.CONTENT OF THE PRESENT APPLICATIONIn order to solve the problems in the related art, the embodiments of the present application provide a print head assembly having good cutting efficiency and good quality of waste material recovery, and a 3D printing apparatus using the same.The embodiments of the present application provide a printhead assembly comprising a transfer channel, the transfer channel being used for transferring a consumable material, the printhead assembly further comprising:a feeding mechanism, wherein the transfer channel is disposed along the axial direction through the feeding mechanism, and wherein the feeding mechanism is used for transferring the consumable;a hot end, wherein the transfer channel is disposed along the axial direction through the hot end, and wherein the hot end is used to heat the consumable; anda cutting mechanism comprising a cutting element, wherein the cutting element is arranged movably with respect to the feeding mechanism and the hot end, and wherein the cutting element is constructed such that it can enter a portion of the transfer channel located between the feeding structure and the hot end and cut the consumable material.In one embodiment, the printhead assembly further comprises:a holder, wherein the feeding mechanism and the hot end are respectively connected to the holder, wherein the holder comprises a first connecting member located between the feeding mechanism and the hot end, and wherein the transfer channel passes through the first connecting member along the axial direction;and wherein the cut-off member comprises a connecting segment and a first end portion and a second end portion located at two ends of the connecting segment, and wherein the connecting segment is rotatably connected to the first connecting member, and wherein the first end portion is disposed close to the transfer channel with respect to the connecting segment and has a cutting edge facing the transfer channel, and wherein the second end portion is disposed away from the transfer channel with respect to the connecting segment.In one embodiment, the transfer channel is arranged to extend along a first direction, wherein the cut-off element is in the form of a sheet, and wherein the connecting segment is rotated along the plane of rotation such that the first end portion is capable of sweeping through the transfer channel, and wherein the first direction crosses the plane of rotation.In an embodiment, the first direction is oriented perpendicular to the plane of rotation; wherein the connecting segment and the first end portion, which are leaf-like, are each provided to extend along the plane of rotation, and wherein the leaf-like second end portion is provided to extend along the first direction.In one embodiment, the connecting segment is arranged on a side of the first connecting element facing away from the hot end along the first direction, wherein the feed mechanism is located on a side of the first connecting element facing away from the hot end along the first direction, and wherein the first connecting element and the feed mechanism are spaced apart from one another such that at least a part of the transfer channel facing the first connecting element is exposed, and wherein the first end section is arranged corresponding to this exposed part of the transfer channel, and wherein the connecting segment and the first end section are arranged on a side of the first connecting element facing away from the hot end and facing the feed mechanism, and wherein a side of the connecting segment facing away from the first end section protrudes to the outside of the first connecting element, and wherein the second end portion is connected to a side of the connecting segment facing away from the first end portion and extends along the first direction toward a side on which the hot end is located.In an embodiment, the cut-off mechanism further comprises a fastening element, wherein the fastening element is firmly connected to the first connecting element, and wherein the connecting segment is placed on the fastening element and can rotate with respect to the fastening element, and wherein the first end section and the second end section are each located on two mutually remote sides of the fastening element.In one embodiment, the connecting segment comprises a first segment and a second segment that are connected to one another, wherein the fastening element is placed at the connection point between the first segment and the second segment, and wherein the first end section is connected to the first segment, and wherein the second end section is connected to the second segment, and wherein the cut-off mechanism further comprises a restoring element that is connected to the second segment.In one embodiment, the first connecting element is provided with a recessed receiving cavity, wherein the cut-off element further comprises a third end portion, and wherein the third end portion is connected to the second segment and protrudes into the receiving cavity, and wherein the reset element is arranged in the receiving cavity, and wherein the reset element is clamped between the third end portion and a side wall of the receiving cavity, and wherein the force arm distance between the cutting edge and the fastening element is smaller than the force arm distance between the reset element and the fastening element.The embodiments of the present application provide a 3D printing apparatus, comprising a forming platform, a drive assembly, and a printhead assembly according to any of the embodiments, wherein the drive assembly drives the printhead assembly to move relative to the forming platform.In one embodiment, the cut-off mechanism is provided on the Z axis of the drive assembly, and the feed mechanism and hot end are provided on the X axis of the drive assembly.It will be understood that the printhead assembly includes a feed mechanism and a hot end so that the consumable can be continuously heated and extruded to achieve printing and that the transfer channel penetrates the feed mechanism, hot end and holder to ensure continuity of supply of the consumable. The cut-off member is constructed so as to be able to enter a portion of the transfer channel located between the feeding structure and the hot end and cut the consumable to realize the cutting of the consumable located upstream of the hot end, whereby it can be completely prevented that the consumable expands due to the heat in the hot end, resulting in the phenomenon of sticking and incomplete cutting in cutting off the consumable, thus improving the cleanliness of the surface of the cut-off, and reducing the phenomenon of blocking the subsequent feeding due to the poor smoothness of the cut-off point of the consumable.Further, the cut-off member is connected to a first connecting member disposed between the feeding mechanism and the hot end, so that the cut-off member can correspond to the transfer channel located between the feeding mechanism and the hot end to cut the consumable material located upstream of the hot end, whereby it can be completely prevented that the consumable material expands due to the heat in the hot end, resulting in the phenomenon of sticking and incomplete cutting upon cutting the consumable material, thus improving the cleanliness of the surface of the cut-off, and reducing the phenomenon of blocking the subsequent feeding due to the poor smoothness of the cut-off point of the consumable material. A connecting segment is rotatably connected to the first connecting member, a first end portion is disposed close to the transfer channel and has a cutting edge facing the same, and a second end portion is disposed relatively away from the transfer channel, namely, the cutting member cooperates with the first connecting member to form a lever structure, and by pushing the second end portion, the second end portion can be made to drive the connecting segment to rotate, the connecting segment further drives the first end portion to rotate and causes the cutting edge to pass through the transfer channel to finally realize the cutting of the consumable, and the cutting process is convenient and quick, which can effectively improve the efficiency of the cutting of the consumable.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 shows a three-dimensional schematic diagram of a printhead assembly provided by an embodiment of the present application; FIG. 2 is a partial three-dimensional schematic diagram of a printhead assembly provided by an embodiment of the present application; FIG. 3 is a partial three-dimensional schematic diagram of a working state of a printhead assembly provided by an embodiment of the present application; FIG. 4 is a partial three-dimensional schematic diagram of another operating state of a printhead assembly provided by an embodiment of the present application; FIG. 5 is a three-dimensional schematic diagram of a 3D printing apparatus provided by an embodiment of the present application.List of reference characters10 Print head assembly 101 Transfer channel 11 Supply mechanism 111 Supply driving member 12 Hot end 121 Heat dissipation portion 122 Heating portion 123 Nozzle portion 13 Holder 131 Upper half 132 Lower half 133 First connection member 1331 Accommodation cavity 1332 Side wall 15 Cut-off mechanism 151 Cut-off member 1510 Cutting edge 1511 First end portion 1512 Second end portion 1513 Third end portion 1514 Connection segment 15141 First segment 15142 Second segment 152 Fixing member 153 Reset member Z First direction A Rotation plane 1 3D printing apparatus 16 Drive assembly 18 Forming platformThe following specific embodiments further illustrate the present application in conjunction with the accompanying drawings.DETAILED DESCRIPTIONThe content of the present application is explained in more detail below in conjunction with the appended drawings. In the accompanying drawings, exemplary embodiments of the present application are illustrated. However, the present application may be implemented in many different forms and should not be construed as being limited to the exemplary embodiments illustrated herein. These exemplary embodiments are provided to make the present application thorough and complete, and fully convey the scope of the present application to those skilled in the art. Similar reference numerals are used to indicate like or similar components. The terms used herein are used to describe certain exemplary embodiments only and should not limit the present application. As used herein, the singular forms "a", "an" and "the" also include the plural form, unless the context clearly indicates otherwise. Moreover, the use of "including" and / or "comprising" and / or "having" integers, steps, operations, components, and / or assemblies excludes the presence or addition of one or more other features, regions, integers, steps, operations, components, and / or groups thereof. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless expressly defined in the text, terms as defined in general dictionaries are to be construed as having a meaning that is consistent with their meaning in the relevant art and the content of this application, and are not to be construed as having an idealized or overly formal meaning.Normally, fused deposition moulding (FDM) is a 3D printing technology using thermoplastic polymer materials which are heated and melted by a die and then extruded and incrementally stacked on a printing platform to form a three dimensional object. In multicolor FDM printing technology, a plurality of colored plastic filaments are used in a single print project, so that colored or multicolor 3D models can be printed without the need for postcoloring or painting. However, since the consumables for FDM are typically thermoplastic materials such as wax, ABS (acrylonitrile butadiene styrene terpolymer), nylon, etc., the consumables are heated and melted in the printhead, the printhead moves along the contours of the part cross section and the filling web as it extrudes the melted material, the consumables solidify quickly and coagulate with the surrounding materials to complete the print of the model. However, in the FDM type 3D printers, when color change for printing as well as change of consumables for printing is required, the consumables in the vicinity of the heater block or the nozzle tend to be deformed by melting, and therefore, it is easily possible that the consumables located in the supply passage adhere to the inner wall of the supply passage at the time of return, and the supply passage is blocked, which then causes the printing to be interrupted or the printing fails.Accordingly, the embodiments of the present application provide a printhead assembly and a 3D printing apparatus using the same. The printhead assembly has a transfer channel used to transfer the consumable, the printhead assembly further comprising a feed mechanism, a hot end, a holder, and a cut-off mechanism. The transfer channel is disposed through the feeding mechanism, wherein the feeding mechanism is used for passing the consumable; and wherein the transfer channel is disposed through the hot end, and wherein the hot end is used for heating the consumable; and wherein the cutting mechanism comprises a cutting element disposed movably with respect to the feeding mechanism and the hot end, and wherein the cutting element is constructed to enter a portion of the transfer channel located between the feeding structure and the hot end and to cut the consumable.Further, the print head assembly includes a feeding mechanism and a hot end so that the consumable can be continuously heated and extruded to achieve printing, and the transfer channel penetrates the feeding mechanism, the hot end and the holder to ensure the continuity of feeding the consumable. The cut-off member is constructed so as to be able to enter a portion of the transfer channel located between the feeding structure and the hot end and cut the consumable to realize the cutting of the consumable located upstream of the hot end, whereby it can be completely prevented that the consumable expands due to the heat in the hot end, resulting in the phenomenon of sticking and incomplete cutting in cutting off the consumable, thus improving the cleanliness of the surface of the cut-off, and reducing the phenomenon of blocking the subsequent feeding due to the poor smoothness of the cut-off point of the consumable.As one of ordinary skill in the art can understand, the term "3D printing" refers to a technology in which an object is constructed by laminating based on a digital model file using bindable materials such as metal or plastic powder.In conjunction with the appended drawings, the exemplary embodiments are explained in more detail below. Note that the components illustrated in the accompanying drawings are not necessarily to scale; rather, identical or similar components are represented by the attached reference numerals or similar technical terms in the same or similar manner.In conjunction with the accompanying drawings, the specific embodiments of the present application will be described in more detail below.As shown in Figures 1 through 4, one embodiment of the present application provides a printhead assembly 10 having a transfer channel 101, the transfer channel 101 being used to transfer a consumable (not shown). The print head assembly 10 further comprises a feeding mechanism 11, a hot end 12, a holder 13 and a cutting mechanism 15, wherein the feeding mechanism 11, the hot end 12 and the cutting mechanism 15 are respectively connected to the holder 13, and wherein the transfer channel 101 passes through the feeding mechanism 11, the hot end 12 and the holder 13, and wherein at least a part of the cutting mechanism 15 can swing with respect to the transfer channel 101 to achieve the cutting of the consumable material.In one embodiment, the transfer channel 101 is arranged through the feeding mechanism 11, wherein the feeding mechanism 11 is used for transferring the consumable material. The transfer channel 101 is arranged through the hot end 12, wherein the hot end 12 is used for heating the consumable material. The holder 13 comprises a first connecting element 133 located between the feeding mechanism 11 and the hot end 12, wherein the transfer channel 101 passes through the first connecting element 133. The cut-off mechanism 15 includes a cut-off member 151 rotatably connected to the first link 133 so that the cut-off member 151 can swing with respect to the transfer passage 101, and the cutting edge 1510 of the cut-off member 151 can sweep through the transfer passage 101 to cut off the consumable.It should be understood that the print head assembly 10 includes a feeding mechanism 11 and a hot end 12 so that the consumable can be continuously heated and extruded to achieve printing, and that the transfer channel 101 penetrates the feeding mechanism 11, the hot end 12 and the holder 13 to ensure the continuity of feeding the consumable. The cut-off member 151 is connected to a first connecting member 133 disposed between the feeding mechanism 11 and the hot end 12, so that the cut-off member 151 can correspond to the transfer channel 101 disposed between the feeding mechanism 11 and the hot end 12 to cut the consumable material disposed upstream of the hot end 12, whereby it can be completely prevented that the consumable material expands due to the heat in the hot end 12, resulting in the phenomenon of sticking and incomplete cutting upon cutting off the consumable material, thus improving the cleanliness of the surface of the cut-off, and reducing the phenomenon of blocking the subsequent feeding due to the poor smoothness of the cut-off point of the consumable material.In an embodiment, the cut-off element 151 includes a connecting segment 1514, and a first end portion 1511 and a second end portion 1512 located at two ends of the connecting segment. The connecting segment 1514 is rotatably connected to the first connecting element 133, wherein the first end portion 1511 is arranged close to the transfer channel 101 with respect to the connecting segment 1514, and has a cutting edge 1510 facing the transfer channel 101, and wherein the second end portion 1512 is arranged away from the transfer channel 101 with respect to the connecting segment 1514.It is understood that the connecting segment 1514 is rotatably connected to the first connecting member 133, the first end portion 1512 is disposed close to the transfer channel 101 and has a cutting edge 1510 facing it, and the second end portion 1512 is disposed relatively away from the transfer channel 101, namely the cutting member 151 cooperates with the first connecting member 133 to form a lever structure, and by pushing the second end portion 1512, the second end portion 1512 can be made to rotate the connecting segment 1514, the connecting segment 1514 continues to rotate the first end portion 1511 and causes the cutting edge 1510 to pass through the transfer channel 101 to finally realize the cutting of the consumable material, and the cutting process is convenient and quick, which can effectively improve the efficiency of cutting off the consumable.In one embodiment, the feed mechanism 11 comprises a feed drive element 111 and an extrusion gear pair (not shown), wherein the feed drive element 111 is connected in a force-fit manner to an extrusion gear of the extrusion gear pair, and wherein the transfer channel 101 passes through the extrusion gear pair, and wherein the extrusion gear pair clamps the consumable and feeds the consumable to the hot end 12 under the drive of the feed drive element 111.It is understood that the structures of the feed drive element 111 and the extrusion gear pair may be known and realizable structures, e.g. a drive motor and an action wheel cooperate with the driven wheel, the specific construction of which is not explained in more detail here.In an embodiment, the hotend 12 includes at least a heat dissipation portion 121, a heating portion 122, and a nozzle portion 123, wherein the heat dissipation portion 121 and the heating portion 122 are connected to the nozzle portion 123, respectively. The heating portion 122 is capable of heating the nozzle portion 123 so that consumables located therebetween are heated and melted, and the heat dissipation portion 121 is thermally coupled to the nozzle portion 123 and / or the heating portion 122 to achieve heat dissipation from the hot end 12.In the present embodiment, the first connecting member 133 is located on a side of the heat dissipation portion 121 opposite to the heating portion 122 and the nozzle portion 123 to prevent the cut-off mechanism 15 connected to the first connecting member 133 from cutting the consumable in the state of being subjected to thermal expansion, thereby improving the cut-off efficiency and the cut-off quality of the consumable.It is understood that the structures of the heat dissipation portion 121, the heating portion 122, and the nozzle portion 123 may be known and realizable structures, the specific configuration of which will not be explained in detail here.In an embodiment, the holder 13 further comprises an upper half 131 and a lower half 132 spaced apart from each other, wherein the upper half 131 and the lower half 132 are located along a first direction Z on two mutually opposite sides of the first connecting element 133 and are each connected to the first connecting element 133. The upper half 131 is used for connecting the feeding mechanism 11, the lower half 132 is used for connecting the hot end 12, and the first connecting element 133 is used for connecting to the cutting mechanism 15, so that the cutting mechanism 15 can be located between the hot end 12 and the feeding mechanism 11.In an embodiment, the first link 133 is in the form of a plate, a plane in which the extending direction of the large surface of the first link 133 is located is the rotational plane A, and the transfer channel 101 is provided to extend along the first direction Z. The cut-off member 151 is in the form of a sheet, the connecting segment 1514 is rotated along the rotation plane A so that the first end portion 1511 is capable of sweeping through the transfer channel 101 and the first direction Z crosses the rotation plane A.In the present embodiment, the first direction Z is perpendicular to the rotation plane A; the connecting segment 1514 and the first end portion 1511 that are sheet-like are each provided to extend along the rotation plane A, and the sheet-like second end portion 1512 is provided to extend along the first direction Z.It should be appreciated that the connecting segment 1514 and the first end portion 1511 may both have the shape of a blade to facilitate their rotation with respect to the first connecting member 133. At the same time, the edge of the sheet-like first end portion 1511 facilitates formation of a cutting edge 1510 constructed to be vertical with respect to the transfer passage 101 (the consumable), and the ideal cut surface which arises when the cut-off member 151 cuts off the consumable is the smallest-area cross section which can be produced by the cutting off of the consumable. Due to this structure, cutting of the consumable by the cutting member 151 becomes more efficient, and a better cut surface can be formed.In one exemplary embodiment, the connecting segment 1514 is arranged on a side of the first connecting element 133 facing away from the hot end 12 along the first direction Z, wherein the feed mechanism 11 is located on a side of the first connecting element 133 facing away from the hot end 12 along the first direction Z. The first connecting member 133 and the feeding mechanism 11 are spaced apart from each other so that at least a part of the transfer channel 101 facing the first connecting member 133 is exposed, and the first end portion 1511 is disposed corresponding to this exposed part of the transfer channel 101.It is understood that at least a part of the transfer channel 101 located between the feeding mechanism 11 and the hot-end 12 is exposed so that the consumable can be exposed and cut off by the cutting element 151. This exposed portion corresponding to the transfer channel 101 is preferably located between the feeding mechanism 11 and the hot end 12, and this exposed portion is far from the hot end 12 so that the consumable therein is less subject to heating by the hot end 12 which does not adversely affect the cutting operation; at the same time, this exposed portion is located downstream of the feeding mechanism 11 so that the consumable can be easily retracted.In one embodiment, the cut-off mechanism 15 further includes a fastener 152. The fastening element 152 is firmly connected to the first connecting element 133, wherein the connecting segment 1514 is placed on the fastening element 152 and can rotate with respect to the fastening element 152, and wherein the first end section 1511 and the second end section 1512 are respectively located on two mutually remote sides of the fastening element 152.In the present embodiment, the fastener 152 may be a bolt that passes through the connecting segment 1514 and is then fastened to the first connecting member 133. The first end portion 1511 and the second end portion 1512 are respectively located on two opposite sides of the fixing member 152 so that the first end portion 1511 and the second end portion 1512 can rotate about the fixing member 152 as an axis, namely, by pushing the second end portion 1512, the first end portion 1511 can be driven to rotate to realize the cutting of the consumable.In one embodiment, the connecting segment 1514 includes a first segment 15141 and a second segment 15142 that are connected together, with the fastener 152 seated at the junction between the first segment 15141 and the second segment 15142. The first end portion 1511 is connected to the first segment 15141, and the second end portion 1512 is connected to the second segment 15142.In the present embodiment, the first segment 15141 is arranged at an angle to the second segment 15142, wherein the angle between the first segment 15141 and the second segment 15142 is generally between 130° and 175°.In one embodiment, the cut-off mechanism 15 further includes a reset element 153 connected to the second segment 15142. The first connecting member 133 is provided with a recessed receiving cavity 1331, wherein the cut-off member 151 further comprises a third end portion 1513, and wherein the third end portion 1513 is connected to the second segment 15142 and protrudes into the receiving cavity 1331, and wherein the restoring member 153 is disposed in the receiving cavity 1331, and wherein the restoring member 153 is clamped between the third end portion 1513 and a side wall 1332 of the receiving cavity 1331.It is understood that the restoring member 153 is used for the automatic restoring of the cut-off member 151, and the restoring member 153 may be a structure that is restored by an elastic force, such as a spring, a torsion spring, an elastic rubber rod, and other parts having the ability to elastically deform and restore, and the restoring member 153 may also be a structure that is restored by other forces (such as a magnetic force).In the present embodiment, the accommodation cavity 1331 is formed such that a surface of the first connecting member 133 provided with the cut-off member 151 is recessed, and the accommodation cavity 1331 may have an arc-shaped shape corresponding to the arc shape drawn by the third end portion 1513 rotating about the fixing member 152 as an axis. The receiving cavity 1331 is located between the third end portion 1513 and the first end portion 1511, wherein one end of the restoring element 153 is held against the third end portion 1513, and wherein the other end is held against the side wall 1332 of the receiving cavity 1331 facing away from the third end portion 1513 (or the second segment 15142).In an embodiment, the connecting segment 1514 and the first end section 1511 are arranged on a side of the first connecting element 133 facing away from the hot end 12 and facing the feed mechanism 11, wherein a side of the connecting segment 1514 facing away from the first end section 1511 protrudes to the outside of the first connecting element 133, and wherein the second end section 1512 is connected to a side of the connecting segment 1514 facing away from the first end section 1511 and extends along the first direction Z to a side on which the hot end 12 is located.In the present embodiment, the second end portion 1512 protrudes to the outside of the first link 133 and has a certain gap to the edge of the first link 133 so that the second end portion 1512 has a certain movement margin.It is understood that, with respect to the connecting line between the fixing member 152 and the transfer channel 101 on the rotation plane A as the boundary line, the first segment 15141, the first end portion 1511, the accommodation cavity 1331, the reset member 153, and the third end portion 1513 are located on the same side, and the second segment 15142 and the second end portion 1512 are arranged along the boundary line. When the second end portion 1512 is pushed, the second end portion 1512 drives the connecting segment 1514 to rotate about the fastening member 152 as an axis, the cutting edge 1510 at the first end portion 1511 passes through the transfer channel 101 and cuts the consumable, and the third end portion 1513 presses the restoring member 153 together. When the external force applied to the second end portion 1512 is retracted, the restoring member 153 pushes the third end portion 1513, and the third end portion 1513 drives the connecting segment 1514 to rotate about the fixing member 152 as an axis to restore the first end portion 1511 and the second end portion 1512.In one embodiment, the power arm distance between the cutting edge 1510 and the fastener 152 is less than the power arm distance between the reset member 153 and the fastener 152.It is understood that the length of the first segment 15141 is smaller than the length of the second segment 15142, thereby enhancing the cutting effect of the cutting edge 1510 on the consumable material by the leverage principle.In combination with Figure 5, the embodiment of the present application further provides a 3D printing apparatus 1 comprising a forming platform 18, a drive assembly 16 and a print head assembly 10 in any of the foregoing embodiments, wherein the drive assembly 16 drives the print head assembly 10 to move relative to the forming platform 18.In another embodiment, the drive assembly 16 may be an assembly capable of three-axis drive, wherein the drive assembly 16 includes an X-axis, a Y-axis, and a Z-axis, and wherein the cut-off mechanism 15 is provided on the Z-axis of the drive assembly 16, and wherein the feeding mechanism 11 and the hot end 12 are provided on the X-axis of the drive assembly 16. The drive assembly 16 is capable of driving the feeding mechanism 11 and the hot end 12 toward the cutting mechanism 15 for impact, and the cutting member 151 is constructed to penetrate a portion of the transfer channel 101 located between the feeding mechanism 11 and the hot end 12 and cut the consumable, so that the cutting mechanism 15 can cut the consumable.Above, specific embodiments of the present application will be described with reference to the accompanying drawings. However, one of ordinary skill in the art can understand that various changes and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. These changes and substitutions are within the scope of the present application.

Claims

A printhead assembly comprising a transfer channel, the transfer channel being used for transferring a consumable material, characterized in that the printhead assembly further comprises: a feed mechanism, the transfer channel being arranged along the axial direction through the feed mechanism, and the feed mechanism being used for passing the consumable material; a hot end, the transfer channel being arranged along the axial direction through the hot end, and the hot end being used for heating the consumable material; a cut-off mechanism comprising a cut-off element, the cut-off element being arranged to be movable with respect to the feed mechanism and the hot end, and the cut-off element being constructed to enter a portion of the transfer channel located between the feed structure and the hot end and to be able to cut the consumable material.The printhead assembly of claim 1, characterized in that the printhead assembly further comprises: a bracket, wherein the feeding mechanism and the hot end are respectively connected to the bracket, wherein the bracket comprises a first connecting member located between the feeding mechanism and the hot end, and wherein the transfer channel passes through the first connecting member along the axial direction; and wherein the cut-off member comprises a connecting segment and a first end portion and a second end portion located at two ends of the connecting segment, and wherein the connecting segment is rotatably connected to the first connecting member, and wherein the first end portion is disposed close to the transfer channel with respect to the connecting segment and has a cutting edge facing the transfer channel, and wherein the second end portion is disposed away from the transfer channel with respect to the connecting segment.The printhead assembly of claim 2, characterized in that the transfer channel is arranged to extend along a first direction, wherein the cut-off element is in the form of a sheet, and wherein the connecting segment is rotated along the plane of rotation such that the first end portion is capable of sweeping through the transfer channel, and wherein the first direction crosses the plane of rotation.The printhead assembly of claim 3, characterized in that the first direction is oriented perpendicular to the rotational plane; wherein the connecting segment and the first end portion that are sheet-like are each provided to extend along the rotational plane, and wherein the sheet-like second end portion is provided to extend along the first direction.The printhead assembly of claim 3, characterized in that the connecting segment is arranged on a side of the first connecting element facing away from the hot end along the first direction, wherein the feeding mechanism is arranged on a side of the first connecting element facing away from the hot end along the first direction, and wherein the first connecting element and the feeding mechanism are spaced apart from each other such that at least a part of the transfer channel facing the first connecting element is exposed, and wherein the first end portion is arranged corresponding to this exposed part of the transfer channel, and wherein the connecting segment and the first end portion are arranged on a side of the first connecting element facing away from the hot end and facing the feeding mechanism, and wherein a side of the connecting segment facing away from the first end portion protrudes to the outside of the first connecting element, and wherein the second end portion is connected to a side of the connecting segment facing away from the first end portion and extends along the first direction toward a side on which the hot end is located.The printhead assembly of claim 2, characterized in that the cut-off mechanism further comprises a fastener, wherein the fastener is fixedly connected to the first connecting member, and wherein the connecting segment is seated on the fastener and is rotatable with respect to the fastener, and wherein the first end portion and the second end portion are each located on two opposing sides of the fastener.The printhead assembly of claim 6, characterized in that the connecting segment comprises a first segment and a second segment connected together, wherein the fastener is seated at the junction between the first segment and the second segment, and wherein the first end portion is connected to the first segment, and wherein the second end portion is connected to the second segment, and wherein the cut-off mechanism further comprises a reset element connected to the second segment.The printhead assembly of claim 7, characterized in that the first connecting element is provided with a recessed receiving cavity, wherein the cut-off element further comprises a third end portion, and wherein the third end portion is connected to the second segment and protrudes into the receiving cavity, and wherein the reset element is disposed in the receiving cavity, and wherein the reset element is clamped between the third end portion and a side wall of the receiving cavity, and wherein the force arm distance between the cutting edge and the mounting element is less than the force arm distance between the reset element and the mounting element.3D printing apparatus, characterized in that it comprises a forming platform, a drive assembly and a print head assembly according to any one of claims 1 to 8, wherein the drive assembly drives the print head assembly to move relative to the forming platform.The 3D printing apparatus according to claim 9, characterized in that the cut-off mechanism is provided on the Z-axis of the drive assembly, the feeding mechanism and the hot end being provided on the X-axis of the drive assembly.

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