Printhead assembly and three-dimensional printing apparatus

Abstract

The present application relates to a printhead assembly and a three-dimensional printing apparatus. The printhead assembly comprises: a material conveying unit, which comprises a first conveying wheel and a second conveying wheel that are spaced apart to define a conveying passage for extruding or retracting a consumable material in a first direction; and a cutting blade unit, which comprises a cutting blade component and a first rotating shaft, wherein the position of the first rotating shaft relative to the conveying passage is fixed, and the axis of the first rotating shaft is parallel to the first direction. The cutting blade component is connected to the first rotating shaft and disposed at a first end of the conveying passage. Under the action of an external force applied to the cutting blade component in a second direction, the cutting blade component can rotate around the first rotating shaft to a first position to cut the consumable material extruded from the conveying passage, and the cutting blade component can also rotate around the first rotating shaft to a second position to move away from the conveying passage, where the second direction is perpendicular to the first direction. The present application enables rapid and effective cutting of the consumable material, and also occupies less space, facilitating structural miniaturization.

Description

Printhead assembly and stereoscopic printing device

[0001] The present application claims priority to the Chinese patent application No. 202411322770.8, filed on September 20, 2024, and entitled "Printhead assembly and stereoscopic printing device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of 3D, and in particular, to a printhead assembly and a stereoscopic printing device. BACKGROUND

[0003] Fused Deposition Modeling (FDM) is a method of printing a three-dimensional object by layering and accumulating a consumable material after being heated and melted.

[0004] In the process of 3D printing, when the consumable material needs to be replaced, the consumable material is pulled back from the printing nozzle. Since the consumable material in the nozzle area of the printing nozzle is in a molten state, if the consumable material in the molten state is pulled back from the printing nozzle, the consumable material in the molten state will contaminate or seep into other components of the printing nozzle, affecting the working efficiency of the printing nozzle. Therefore, it is necessary to provide a printhead assembly and a stereoscopic printing device capable of cutting off the consumable material and pulling back the solid part from the printing nozzle when the consumable material is replaced. SUMMARY

[0005] The embodiments of the present application provide a printhead assembly and a stereoscopic printing device, which can quickly and effectively cut off the consumable material, occupy less space, and are more conducive to miniaturization.

[0006] In a first aspect, the printhead assembly provided by the embodiments of the present application comprises:

[0007] A material conveying unit comprising a first conveying wheel and a second conveying wheel arranged at intervals to define a conveying channel for extruding or pulling back the consumable material in a first direction; and

[0008] A cutter unit comprising a cutter member and a first rotating shaft, the first rotating shaft being fixed in position relative to the conveying channel, and the axis of the first rotating shaft being parallel to the first direction, the cutter member being connected to the first rotating shaft and arranged at a first end of the conveying channel;

[0009] Under the action of an external force acting on the cutter member in a second direction, the cutter member can rotate about the first rotating shaft to a first position to cut the consumable material located in the conveying channel, and the cutter member can also rotate about the first rotating shaft to a second position to move away from the conveying channel; wherein the second direction is perpendicular to the first direction.

[0010] In some embodiments, the cutter member comprises a shank portion connected to the first rotating shaft and a blade portion disposed on the shank portion, the cutter member is configured as a lever;

[0011] The connection center of the shank portion and the first rotating shaft is a fulcrum of the lever, the shank portion has a first edge portion and a second edge portion disposed at an angle and on both sides of the fulcrum;

[0012] The blade portion is fixed to the first edge portion as a resistance point of the lever, the external force is applied to the second edge portion as a power point of the lever;

[0013] The distance between the power point and the fulcrum is greater than the distance between the resistance point and the fulcrum;

[0014] The blade portion is configured to rotate to the first position to cut the consumable under the action of the external force.

[0015] In some embodiments, the second edge portion is disposed at an angle with the second direction.

[0016] In some embodiments, the cutter member comprises a shank portion and a blade portion, the shank portion has a third edge portion and a fourth edge portion, the third edge portion has a first end and a second end disposed oppositely, the first end of the third edge portion is connected to the first rotating shaft, and the blade portion is connected to the fourth edge portion;

[0017] The third edge portion and the fourth edge portion are disposed at an angle and on both sides of the first rotating shaft, and the distance between the second end of the third edge portion and the first rotating shaft is greater than the distance between the blade portion and the first rotating shaft.

[0018] In some embodiments, the cutter unit further comprises a first sensing member;

[0019] The relative position of the first sensing member and the conveying channel is fixed;

[0020] The first sensing member is configured to trigger the material conveying unit to withdraw the consumable and / or trigger the cutter member to stop rotating after the cutter member is in the first position.

[0021] In some embodiments, the first sensing member is provided with a first photoelectric generation groove;

[0022] The cutter member comprises a first shielding portion, when the cutter member rotates to the first position, the first shielding portion is inserted into or withdrawn from the first photoelectric generation groove;

[0023] The first sensing member is configured to sense that the first shielding part is inserted into or separated from the first photoelectric generation groove, and trigger the material conveying unit to withdraw the consumable and / or trigger the cutter member to stop rotating.

[0024] In some embodiments, it further comprises a first housing, the material conveying unit is arranged in the first housing, and the cutter member is rotatably connected to the first housing through the first rotating shaft.

[0025] The cutter unit further comprises a first reset member connected between the cutter member and the first housing, configured to drive the cutter member to rotate around the first rotating shaft from the first position to a second position to move away from the conveying passage.

[0026] In some embodiments, the first reset member is a torsion spring limited to the cutter member.

[0027] The first reset member comprises a first elastic portion and a second elastic portion connected at one end, the first elastic portion and the second elastic portion are arranged at an angle, and the first elastic portion abuts against the cutter member, and the second elastic portion abuts against the first housing.

[0028] When the cutter member is in the first position, the first reset member is compressed between the cutter member and the first housing.

[0029] In some embodiments, the cutter member is provided with a mounting space recessed in the surface of the cutter member at one end in the first direction, the mounting space has a first side surface corresponding to the first elastic portion, a second side surface corresponding to the second elastic portion, and a bottom surface connected between the first side surface and the second side surface.

[0030] The cutter member further comprises a first limiting portion protruding on the bottom surface of the mounting space.

[0031] The first reset member further comprises a connecting portion connected between the first elastic portion and the second elastic portion, and the connecting portion is limited between the first limiting portion and the mounting space.

[0032] When the cutter member rotates, the free end of the first elastic portion abuts against the first side surface and moves perpendicularly to the first direction, and the free end of the second elastic portion abuts against the first housing and moves perpendicularly to the first direction.

[0033] In some embodiments, the cutter further comprises a second limiting portion and a third limiting portion, the second limiting portion is arranged at one end of the first side away from the bottom surface of the installation space in the first direction, and the third limiting portion is arranged at one end of the second side away from the bottom surface of the installation space in the first direction.

[0034] The first elastic portion is located between the second limiting portion and the bottom surface of the installation space in the first direction.

[0035] When the cutter is in the second position, the second elastic portion is located between the third limiting portion and the bottom surface of the installation space in the first direction.

[0036] In some embodiments, a side of the cutter facing the first housing is provided with a receiving space.

[0037] The first reset member is a spring partially received in the receiving space, one end of the first reset member abuts against a surface of the receiving space, and the other end abuts against the first housing.

[0038] In some embodiments, the print head assembly further comprises a discharge port arranged at a second end of the conveying channel, an inlet channel, and a sensing unit, the second end of the conveying channel is arranged opposite to the first end of the conveying channel.

[0039] The discharge port, the inlet channel, and the conveying channel are sequentially communicated.

[0040] The sensing unit comprises a light blocking member and a second sensing member, the light blocking member is movable to a third position or a fourth position.

[0041] When the inlet channel is free of the consumable, the light blocking member is in the third position, and the light blocking member in the third position can extend to shield at least part of the inlet channel.

[0042] When the inlet channel has the consumable, the consumable in the inlet channel can drive the light blocking member to move to the fourth position.

[0043] One of the light blocking member in the third position and the light blocking member in the fourth position shields the second sensing member, and the other does not shield the second sensing member.

[0044] In some embodiments, the sensing unit further comprises a second reset member.

[0045] When the inlet channel is free of the consumable, the second reset member can drive the light blocking member to move to the third position.

[0046] In some embodiments, the light-blocking member comprises a body portion having a first end and a second end oppositely arranged in the first direction, the first end of the body portion is connected to the second rotating shaft, and the second rotating shaft is fixed relative to the conveying channel;

[0047] The second end of the body portion of the light-blocking member in the third position blocks at least part of the feeding channel; during the process that the consumable enters the feeding channel, the consumable pushes the light-blocking member to rotate around the second rotating shaft to the fourth position.

[0048] In some embodiments, along the direction from the first end to the second end of the body portion, the body portion comprises a straight arm and an arc-shaped arm arranged in sequence, and the arc-shaped arm of the light-blocking member in the third position blocks at least part of the feeding channel.

[0049] In some embodiments, the light-blocking member further comprises a second blocking portion fixed to the body portion, and the second light-electricity generating groove is arranged to face the second blocking portion;

[0050] The second blocking portion of the light-blocking member in the third position is not located in the second light-electricity generating groove, and the second blocking portion of the light-blocking member in the fourth position is located in the second light-electricity generating groove; or, the second blocking portion of the light-blocking member in the third position is located in the second light-electricity generating groove, and the second blocking portion of the light-blocking member in the fourth position is not located in the second light-electricity generating groove.

[0051] In some embodiments, the print head assembly further comprises a first driving unit arranged at one end of the material conveying unit in the second direction, and configured to drive the material conveying unit to extrude or retract the consumable;

[0052] and / or,

[0053] The print head assembly is arranged on a second driving unit, and the second driving unit is configured to drive the print head assembly to move in the second direction, and the print head assembly can move in the second direction to abut against the environmental element, so that the environmental element applies the external force to the cutter.

[0054] In a second aspect, the embodiments of the present application provide a stereoscopic printing device, which comprises the print head assembly provided in any of the above embodiments.

[0055] In some embodiments, the stereoscopic printing device further comprises a second housing;

[0056] The print head assembly is arranged in the second housing and is movable along the second direction to abut the cutter against the second housing, so that the second housing applies the external force to the cutter.

[0057] In some embodiments, the second housing comprises a body and a protrusion protruding from a surface of the body, the protrusion being located on a moving path of the cutter;

[0058] The print head assembly is movable along the second direction to abut the cutter against the protrusion, so that the protrusion applies the external force to the cutter.

[0059] Compared with the prior art, the print head assembly and the stereoscopic printing device have the following beneficial features: the print head assembly comprises a material conveying unit and a cutter unit, the material conveying unit comprises first and second conveying wheels arranged at intervals to define a conveying channel for extruding or retracting the consumable along a first direction; the cutter unit comprises a cutter and a first rotating shaft, the first rotating shaft is fixed relative to the conveying channel, the axis of the first rotating shaft is parallel to the first direction, and the cutter is connected to the first rotating shaft and arranged at a first end of the conveying channel; when the consumable needs to be replaced, an external force acting on the cutter along a second direction can be applied to the cutter to rotate the cutter around the first rotating shaft to a first position, so that the consumable in the conveying channel is quickly and effectively cut off, and after the consumable is cut off, the cutter can be rotated around the first rotating shaft to a second position to be away from the conveying channel; moreover, the cutter is arranged at the first end of the conveying channel and rotates around the first rotating shaft parallel to the first direction to cut the consumable, which not only occupies a small space, but also has a small movement stroke, and is more conducive to miniaturization of the print head assembly. BRIEF DESCRIPTION OF DRAWINGS

[0060] FIG. 1 is a schematic view of a print head assembly according to an embodiment of the present application;

[0061] FIG. 2 is a schematic view of the print head assembly shown in FIG. 1 with part of a first housing removed;

[0062] FIG. 3 is a top view of the print head assembly shown in FIG. 1, wherein the cutter is in a second position;

[0063] FIG. 4 is a bottom view of the print head assembly shown in FIG. 3;

[0064] FIG. 5 is a top view of the print head assembly shown in FIG. 1, wherein the cutter is in a first position;

[0065] FIG. 6 is a bottom view of the print head assembly shown in FIG. 5;

[0066] FIG. 7 is a schematic view of the print head assembly shown in FIG. 6 with part of the first housing removed;

[0067] Fig. 8 is a partial structural schematic view of the print head assembly shown in Fig. 1;

[0068] Fig. 9 is a front view of the partial structure of the print head assembly shown in Fig. 8;

[0069] Fig. 10 is a right view of Fig. 9;

[0070] Fig. 11 is a top view of the cutter unit of the print head assembly shown in Fig. 1;

[0071] Fig. 12 is a schematic view of the structure of the shank portion of the cutter unit shown in Fig. 11;

[0072] Fig. 13 is a schematic view of the structure of the shank portion of the cutter unit shown in Fig. 11;

[0073] Fig. 14 is a schematic view of the sensing unit of the print head assembly shown in Fig. 1;

[0074] Fig. 15 is a top view of the cutter unit of the print head assembly according to the embodiment of the present application;

[0075] Fig. 16 is a bottom view of the print head assembly according to the embodiment of the present application;

[0076] Wherein: 100-printing head assembly (1-material conveying unit (101-conveying channel (101a-first end of conveying channel, 101b-second end of conveying channel), 102-first conveying wheel group (1021-first transmission wheel, 1022-first conveying wheel), 103-second conveying wheel group (1031-second transmission wheel, 1032-second conveying wheel)), 2-cutter unit (201-cutter piece (2011-shaft part (20111-groove structure, 20112-hole structure, 20113-mounting space (201131-first side, 201132-second side, 201133-bottom, 201134-first accommodation area, 201135-second accommodation area, 201136-third accommodation area), 20114-first edge part, 20115-second edge part, 20116-main body, 20117-limiting body, 20118-third edge part, 20119-fourth edge part), 2012-edge part, 2013-first shielding part, 2014-pivot point, 2015-second limiting surface, 2016-first limiting part (20161-protruding body, 20162-column body), 2017-second limiting part, 2018-third limiting part, 2019-receiving space), 202-first sensing piece (2021-first photoelectric generation groove), 203-first reset piece (2031-first elastic part, 2032-second elastic part, 2033-connection part), 204-first rotating shaft, 205-threaded part), 3-first housing (301-limiting groove, 302-first limiting surface), 4-first driving unit, 5-discharge port, 6-feeding channel, 7-sensing unit (701-light blocking piece (7011-main part (70111-straight arm, 70112-arc-shaped arm), 7012-second shielding part), 702-second sensing piece (7021-second photoelectric generation groove), 703-second rotating shaft, 704-second reset piece), 8-second housing (801-protruding part, 802-main body). DETAILED DESCRIPTION

[0077] For the purpose of promoting the understanding and appreciation of the present application, the application will be described in further detail below in conjunction with the attached drawings. Therein:

[0078] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0080] (Embodiment One)

[0081] Referring to FIGS. 1-11, one embodiment of the present application provides a print head assembly 100, which includes a material delivery unit 1 and a cutter unit 2. The material delivery unit 1 can define a delivery channel 101, which can be used to extrude a consumable in a first direction and also can be used to retract the consumable in the first direction. Specifically, in the first direction, the delivery channel 101 has a first end 101a and a second end 101b oppositely arranged. When extruding the consumable, the consumable moves from the second end 101b of the delivery channel 101 to the first end 101a of the delivery channel 101. When retracting the consumable, the consumable moves from the first end 101a of the delivery channel 101 to the second end 101b of the delivery channel 101. The cutter unit 2 includes a cutter member 201 and a first pivot shaft 204. The first pivot shaft 204 is fixed relative to the delivery channel 101, and the first pivot shaft 204 is arranged close to the first end 101a of the delivery channel 101, and the axis of the first pivot shaft 204 is parallel to the first direction. The cutter member 201 is connected to the first pivot shaft 204, and the cutter member 201 is arranged at the first end 101a of the delivery channel 101. When it is necessary to cut the consumable, the cutter member 201 can rotate about the first pivot shaft 204 to a first position as shown in FIG. 6 under the action of an external force acting on the cutter member 201 in a second direction, so as to cut the consumable located in the delivery channel 101. After cutting or when it is not necessary to cut the consumable, the cutter member 201 can also rotate about the first pivot shaft 204 to a second position as shown in FIG. 4, so as to be away from the delivery channel 101. The second direction is perpendicular to the first direction.

[0082] In this embodiment, when it is necessary to replace the consumable, an external force acting on the cutter member 201 in the second direction can be applied to the cutter member 201, so that the cutter member 201 rotates about the first pivot shaft 204 to the first position, thereby quickly and effectively cutting off the consumable extruded by the delivery channel 101, and avoiding the molten consumable from being retracted. After cutting off the consumable, the cutter member 201 can also rotate about the first pivot shaft 204 to the second position to be away from the delivery channel 101, and the cutter member 201 is arranged at the first end 101a of the delivery channel 101 and cuts the consumable by rotating about the first pivot shaft 204 which is parallel to the first direction. This not only has a simple structure and occupies a small space, but also has a small movement stroke, so that the structure of the print head assembly 100 is more compact, and the print head assembly 100 is more conducive to miniaturization.

[0083] As an example, the consumable can be a filament.

[0084] In some preferred embodiments, the material conveying unit 1 can comprise a first conveying wheel 1022 and a second conveying wheel 1032 arranged at intervals, and the interval between the first conveying wheel 1022 and the second conveying wheel 1032 is configured as the conveying channel 101.

[0085] In some preferred embodiments, referring to FIG. 11, the cutter 201 can comprise a handle portion 2011 and a blade portion 2012. The handle portion 2011 is connected to the first rotating shaft 204, and the blade portion 2012 is arranged on the handle portion 2011. In order to cut the consumable more labor-saving and effectively, the cutter 201 can be configured as a lever. Specifically, the connection center of the handle portion 2011 and the first rotating shaft 204 is configured as a fulcrum 2014 of the lever, the handle portion 2011 has a first side portion 20114 and a second side portion 20115, the first side portion 20114 and the second side portion 20115 are arranged at an angle, and the first side portion 20114 and the second side portion 20115 are arranged on both sides of the fulcrum 2014. The blade portion 2012 is fixed to the first side portion 20114 as a resistance point of the lever, and an external force is applied to the second side portion 20115 as a power point of the lever. In order to save labor, a first distance L1 between the power point and the fulcrum 2014 is greater than a second distance L2 between the resistance point and the fulcrum 2014. As shown in FIGS. 5 and 11, when an external force F in the second direction acts on the power point of the cutter 201, the external force F pushes the cutter 201 to rotate around the fulcrum 2014, and when the blade portion 2012 rotates to the first position, the consumable extruded from the first end 101a of the conveying channel 101 can be cut.

[0086] In the present embodiment, the cutter 201 not only can cut the consumable quickly and effectively, but also occupies a small space and has a small movement stroke, which is more conducive to the miniaturization of the print head assembly 100.

[0087] In some preferred embodiments, the force applier of the external force F can be an environmental element. When the print head assembly 100 moves in the second direction to the power point of the cutter 201 abutting against the environmental element, the environmental element can apply an external force F in the second direction to the cutter 201, thereby pushing the cutter 201 to rotate and cut the consumable. Without the need to additionally arrange a driving mechanism to drive the cutter 201 to rotate, the occupied space of the print head assembly 100 is further saved, and the weight and production cost of the print head assembly 100 are effectively reduced.

[0088] As an example, the print head assembly 100 can be arranged in a second housing 8 of a stereoscopic printing device, and the second housing 8 can be an environmental element for applying the external force F. The print head assembly 100 can move along the second direction to approach or move away from the second housing 8. When the print head assembly 100 moves along the second direction to abut the power point of the cutter member 201 against the second housing 8, the second housing 8 can apply the external force F along the second direction to the cutter member 201, thereby pushing the cutter member 201 to rotate to cut the consumable. The present example not only effectively cuts the consumable and facilitates the miniaturization of the print head assembly 100, but also does not need to additionally arrange a driving mechanism to drive the cutter member 201 to rotate, thereby further saving the occupied space of the print head assembly 100 and effectively reducing the weight and production cost of the print head assembly 100.

[0089] Other structures of the print head assembly 100 described above can interfere with the second housing 8, making it difficult or even impossible for the cutter member 201 to abut the second housing 8.

[0090] In some preferred embodiments, in order to solve the interference problem, the second edge portion 20115 can be arranged at an angle with respect to the second direction. That is, the second edge portion 20115 can extend obliquely with respect to the second direction, so that the second edge portion 20115 can protrude more from the print head assembly 100, thereby effectively abutting the second housing 8, as shown in FIGS. 3 and 5.

[0091] In some more preferred embodiments, in order to further solve the interference problem, the second housing 8 can include a body 802 and a protrusion 801, and the body 802 is provided with a printing chamber (not shown in the figure). The print head assembly 100 is arranged in the printing chamber, and the protrusion 801 is arranged on the body 802 and corresponds to the cutter member 201, that is, the protrusion 801 is located on the moving path of the cutter member 201, as shown in FIGS. 3 and 5, thereby further shortening the distance between the power point of the cutter member 201 and the second housing 8, so that when the print head assembly 100 moves along the second direction to abut the second housing 8, the power point of the cutter member 201 abuts the protrusion 801 of the second housing 8 first. Moreover, when the cutter member 201 rotates to the first position to complete the cutting, there is still a certain gap between other structures of the print head assembly 100 and the second housing 8, as shown in FIG. 5, thereby enabling the cutter member 201 to effectively cut the consumable.

[0092] In the present embodiment, the external force F is a pushing force. It should be noted that in other embodiments, the external force F can be a pulling force, or other forms of force, which can be arranged according to actual conditions, and will not be described here.

[0093] It can be understood that in other embodiments, the cutting tool 201 can also be provided with a driving force for rotating the cutting tool 201 by other environmental elements or other driving mechanisms, so as to drive the cutting tool 201 to rotate around the first rotation shaft 204 in other ways. The driving mechanism can be set according to actual conditions, and details are not described herein.

[0094] In some preferred embodiments, referring to FIG. 4, the blade part 2012 can be detachably fixed to the handle part 2011, so as to facilitate the disassembly and replacement of the blade part 2012. As an example, the blade part 2012 can be fixed to the handle part 2011 by a threaded part 205 such as a screw.

[0095] Referring to FIG. 11, at least one slot structure 20111 or hole structure 20112 can be formed on the handle part 2011. The slot structure 20111 and the hole structure 20112 can be used to reduce the weight of the cutting tool 201, thereby reducing the moment of inertia.

[0096] In some preferred embodiments, the cutting tool unit 2 can further include a first sensing part 202. The first sensing part 202 is fixed relative to the position of the conveying channel 101. When the first sensing part 202 senses that the cutting tool 201 is in the first position, the first sensing part 202 can trigger the material conveying unit 1 to withdraw the consumable.

[0097] In the present embodiment, the material conveying unit 1 withdraws the consumable only when the first sensing part 202 senses that the cutting tool 201 is in the first position, which can effectively avoid the material conveying unit 1 withdrawing the consumable in a molten state, thereby avoiding the consumable in a molten state from polluting or seeping into other parts of the print head assembly 100, prolonging the service life of the print head assembly 100 and improving the work efficiency.

[0098] It should be noted that in some embodiments, the material conveying unit 1 can be triggered to withdraw the consumable after a preset time interval when the first sensing part 202 senses that the cutting tool 201 is in the first position. In another embodiment, the material conveying unit 1 can be triggered to withdraw the consumable immediately when the first sensing part 202 senses that the cutting tool 201 is in the first position. The triggering time can be set according to actual conditions, and details are not described herein.

[0099] As an example, referring to FIGS. 1 to 7, the print head assembly 100 can further include a first driving unit 4, which can be used to drive the material conveying unit 1 to extrude the consumable and can also be used to drive the material conveying unit 1 to withdraw the consumable. When the first sensing part 202 senses that the cutting tool 201 is in the first position, a withdrawal signal is triggered. After receiving the withdrawal signal, the first driving unit 4 drives the material conveying unit 1 to withdraw the consumable.

[0100] In some preferred embodiments, the cutter unit 2 can include the first sensing member 202 described above. The first sensing member 202 is fixed in position relative to the conveying channel 101. When the first sensing member 202 senses that the cutter member 201 is in the first position, the first sensing member 202 can trigger the cutter member 201 to stop rotating, so as to avoid the cutter member 201 from continuing to rotate after the cutting is completed, thereby avoiding the cutter member 201 from rotating excessively and colliding with other elements, so as to protect the cutter member 201 and other elements, thereby improving the service life of the print head assembly 100.

[0101] As an example, the print head assembly 100 can be arranged on a second driving unit (not shown in the figure). The second driving unit can be used to drive the print head assembly 100 to move in a second direction, so as to make the cutter member 201 approach or move away from the environmental element. For example, the second driving unit can be a belt of a corexy motion mechanism.

[0102] In some examples, the second driving unit can be used to drive the print head assembly 100 to move in the second direction, so as to make the cutter member 201 approach or move away from the second housing 8. When the print head assembly 100 moves in the second direction to the power point of the cutter member 201 abutting against the second housing 8, the second housing 8 can exert an external force F on the cutter member 201 in the second direction, so as to push the cutter member 201 to rotate and cut the consumable. When the first sensing member 202 senses that the cutter member 201 is in the first position, the first sensing member 202 triggers the second driving unit to drive the print head assembly 100 to stop moving, so as to make the cutter member 201 stop rotating and remain in or near the first position.

[0103] As an optional embodiment, when the first sensing member 202 senses that the cutter member 201 is in the first position, the first sensing member 202 can not only trigger the material conveying unit 1 to withdraw the consumable, but also trigger the cutter member 201 to stop rotating. Correspondingly, the print head assembly 100 can include the first driving unit 4 and the second driving unit. When the first sensing member 202 senses that the cutter member 201 is in the first position, the first sensing member 202 can trigger the first driving unit 4 to drive the material conveying unit 1 to withdraw the consumable, and the first sensing member 202 can also trigger the second driving unit to drive the print head assembly 100 to stop moving, so as to make the cutter member 201 stop rotating.

[0104] In some preferred embodiments, please refer to FIGS. 8 to 11, the cutter member 201 can further include a first shielding portion 2013 fixed to the shank portion 2011. The first sensing member 202 is provided with a first photoelectric generation groove 2021 facing the first shielding portion 2013.

[0105] In some embodiments, the first blocking portion 2013 is not inserted into the first light- generating groove 2021 when the cutter 201 is in the second position. The first blocking portion 2013 is inserted into the first light-generating groove 2021 when the cutter 201 is rotated to the first position. The first sensing element 202 senses that the cutter 201 is in the first position.

[0106] For example, when the cutter 201 is moved to the first position, the first blocking portion 2013 of the cutter 201 in the first position is inserted into the first light-generating groove 2021 to block the light. When the first sensing element 202 senses that the first blocking portion 2013 is inserted into the first light-generating groove 2021 to block the light, the material extraction signal and / or the movement stopping signal are triggered. The first driving unit 4 receives the material extraction signal and drives the material conveying unit 1 to extract the consumable. The second driving unit receives the movement stopping signal and drives the print head assembly 100 to stop moving.

[0107] In some other embodiments, the first blocking portion 2013 is inserted into the first light-generating groove 2021 when the cutter 201 is in the second position. The first blocking portion 2013 is extracted from the first light-generating groove 2021 when the cutter 201 is rotated to the first position. The first sensing element 202 senses that the cutter 201 is in the first position.

[0108] In some preferred embodiments, referring to FIGS. 1 and 6, the print head assembly 100 further comprises a first housing 3. The material conveying unit 1 is connected in the first housing 3, the first sensing element 202 is fixed to the first housing 3, and the cutter 201 is rotatably connected to the first housing 3 through the first rotating shaft 204.

[0109] For example, referring to FIGS. 4 and 6, the first housing 3 can have a first limiting surface 302 facing the cutter 201, and the cutter 201 has a second limiting surface 2015 corresponding to the first limiting surface 302. When the cutter 201 is rotated to the second position shown in FIG. 6, the second limiting surface 2015 can abut against the first limiting surface 302, or there is a gap between the second limiting surface 2015 and the first limiting surface 302, so as to avoid excessive rotation of the cutter 201.

[0110] In some more preferred embodiments, referring to FIG. 6, the cutter unit 2 further comprises a first reset element 203. The first reset element 203 is connected between the cutter 201 and the first housing 3, and the first reset element 203 can drive the cutter 201 to rotate around the first rotating shaft 204 from the first position to the second position to avoid the consumable in the conveying channel 101, so as to facilitate normal extrusion of the consumable by the print head assembly 100.

[0111] As an optional embodiment, please refer to FIG. 16, the first reset member 203 can be a torsion spring. The first reset member 203 is limited to the cutter member 201, and the first reset member 203 comprises a first elastic part 2031 and a second elastic part 2032, one end of the first elastic part 2031 and one end of the second elastic part 2032 are connected, and the first elastic part 2031 and the second elastic part 2032 are arranged at an included angle. When the cutter member 201 is in the first position, the first elastic part 2031 abuts against the cutter member 201, and the second elastic part 2032 abuts against the first shell 3, so that the first reset member 203 is compressed between the cutter member 201 and the first shell 3. Under the action of the resilience of the first reset member 203, the cutter member 201 can rotate back to the initial position, that is, the second position, around the first rotating shaft 204. The present embodiment is basically the same as the embodiments shown in FIGS. 1 to 14, and therefore the same parts will not be described here.

[0112] As an example, referring to FIG. 11 and FIG. 12, the shank portion 2011 is provided with a mounting space 20113 recessed in the shank portion 2011 at one end of the first direction. The mounting space 20113 has a first side surface 201131, a second side surface 201132, and a bottom surface 201133 connected between the first side surface 201131 and the second side surface 201132, the first side surface 201131 is provided corresponding to the first elastic portion 2031, and the second side surface 201132 is provided corresponding to the second elastic portion 2032. The cutter member 201 further comprises a first limiting portion 2016 protruding from the bottom surface of the mounting space 20113. The first reset member 203 is limited in the mounting space 20113, and the first reset member 203 further comprises a connecting portion 2033 connected between the first elastic portion 2031 and the second elastic portion 2032, the connecting portion 2033 is limited between the first limiting portion 2016 and the mounting space 20113, so that the connecting portion 2033 cannot be separated from the first limiting portion 2016 and the mounting space 20113, nor can it move relative to the first limiting portion 2016. As an example, the first limiting portion 2016 can include a column body 20162 and a protrusion 20161 protruding from the column body 20162 in the radial direction of the column body 20162. The protrusion 20161 is formed at one end of the column body 20162 away from the bottom surface of the mounting space 20113, the protrusion 20161 can extend towards the mounting space 20113 in a direction perpendicular to the first direction, and the protrusion 20161 and the mounting space 20113 have a gap therebetween to facilitate assembly of the connecting portion 2033 of the first reset member 203 to the first limiting portion 2016 from the gap. The connecting portion 2033 is an arc-shaped strip structure and abuts against the surface of the column body 20162, the protrusion 20161 and the mounting space 20113 cooperate to limit the connecting portion 2033 to the column body 20162, so that the connecting portion 2033 cannot be separated from the column body 20162, and the column body 20162, the protrusion 20161 and the mounting space 20113 cooperate to limit the movement of the connecting portion 2033. The free end of the first elastic portion 2031 can abut against the shank portion 2011, and the free end of the second elastic portion 2032 can abut against the first housing 3. When the cutter member 201 rotates, the free end of the first elastic portion 2031 abuts against the first side surface 201131 and moves perpendicular to the first direction, and the free end of the second elastic portion 2032 abuts against the first housing 3 and moves perpendicular to the first direction. When the cutter member 201 is in the initial position, i.e., the second position, the first reset member 203 is in a natural state, at this time, the print head assembly 100 can normally extrude the consumable, and the cutter member 201 is away from the consumable. When it is necessary to replace the material, the cutter member 201 can be driven to rotate around the first rotating shaft 204 to the first position. In the process of rotating the cutter member 201 from the second position to the first position, the cutter member 201 cuts off the consumable. When the cutter member 201 is in the first position, the cutting action is completed.And, in the process of rotating the cutter member 201 from the second position to the first position, the first reset member 203 is gradually extruded and deformed by the first housing 3 and the shank portion 2011. After the cutting operation is completed, the cutter member 201 can be rotated from the first position to the second position under the resilience of the first reset member 203.

[0113] In the present example, when the consumable needs to be replaced, the print head assembly 100 moves in the second direction towards the second housing 8. When the cutter member 201 abuts against the second housing 8 and continues to move, under the action of the pushing force F applied by the second housing 8, the cutter member 201 rotates about the first rotation shaft 204 to the first position to cut off the consumable, completing the cutting operation. When the cutting operation of the cutter member 201 is completed, the print head assembly 100 moves in the second direction away from the second housing 8. In this movement process, under the resilience of the first reset member 203, the cutter member 201 can rotate about the first rotation shaft 204 towards the second position. When the cutter member 201 is completely separated from the second housing 8, the cutter member 201 rotates back to the initial position, that is, the second position.

[0114] Further, in order to further limit the first reset member 203 in the installation space 20113, please refer to FIG. 12 and FIG. 13, the cutter member 201 can further comprise a second limiting portion 2017 and a third limiting portion 2018. The second limiting portion 2017 is arranged at one end of the first side surface 201131 away from the bottom surface of the installation space 20113, that is, the second limiting portion 2017 and the bottom surface 201133 of the installation space 20113 are spaced apart and arranged opposite to each other in the first direction, and the third limiting portion 2018 is arranged at one end of the second side surface 201132 away from the bottom surface 201133 of the installation space 20113, that is, the third limiting portion 2018 and the bottom surface 201133 of the installation space 20113 are spaced apart and arranged opposite to each other in the first direction. After the first reset member 203 is installed between the first limiting portion 2016, the second limiting portion 2017, the third limiting portion 2018 and the installation space 20113, in the natural state, please refer to FIG. 4, under the action of the rebound force of the first reset member 203 itself, the first elastic portion 2031 is limited between the second limiting portion 2017 and the installation space 20113, and the free end of the first elastic portion 2031 abuts against the first side surface 201131. The second elastic portion 2032 is limited between the third limiting portion 2018 and the installation space 20113, and the free end of the second elastic portion 2032 abuts against the first housing 3. When the cutter member 201 rotates to the first position, please refer to FIG. 6, under the action of the first housing 3, the second elastic portion 2032 is pressed to no longer be located or only partially located between the third limiting portion 2018 and the installation space 20113, but the first elastic portion 2031 is still limited between the second limiting portion 2017 and the installation space 20113. When the cutter member 201 rotates from the first position to the second position, under the action of the rebound force of the first reset member 203 itself, the second elastic portion 2032 returns to between the third limiting portion 2018 and the installation space 20113, as shown in FIG. 4. As an example, the bottom surface 201133 of the installation space 20113 can further be provided with a first accommodation area 201134 corresponding to the first limiting portion 2016, the bottom surface 201133 of the installation space 20113 can further be provided with a second accommodation area 201135 corresponding to the second limiting portion 2017, and the bottom surface 201133 of the installation space 20113 can further be provided with a third accommodation area 201136 corresponding to the third limiting portion 2018.

[0115] It should be noted that the installation space 20113 can also be arranged at other positions of the cutter member 201, as long as the cutter member 201 can rotate back to the initial position, that is, the second position, under the action of the rebound force of the first reset member 203.

[0116] In some preferred embodiments, referring to FIG. 4 and FIG. 6 to FIG. 8, the shank 2011 comprises a main body 20116 and a limiting body 20117 protruding from the main body 20116 along the first direction. The first housing 3 is provided with a mounting cavity (not shown) and a limiting groove 301 communicating with the mounting cavity. The material conveying unit 1 is mounted in the mounting cavity. The main body 20116 can be partially accommodated in the mounting cavity, and the limiting body 20117 is exposed from the mounting cavity and cooperates with the limiting groove 301, so that the cutter 201 can be partially embedded in the mounting cavity, and the movement of the cutter 201 along the first direction is limited, thereby improving the stability of the print head assembly 100.

[0117] In some more preferred embodiments, referring to FIG. 4 and FIG. 6, the limiting groove 301 has an arc-shaped groove surface, and the limiting body 20117 has an arc-shaped edge portion. The arc-shaped groove surface of the limiting groove 301 cooperates with the arc-shaped edge portion of the limiting body 20117, which can effectively limit the rotation path of the cutter 201, thereby further improving the stability of the print head assembly 100.

[0118] In some preferred embodiments, referring to FIG. 2, FIG. 8 and FIG. 9, the material conveying unit 1 comprises a first conveying wheel set 102 and a second conveying wheel set 103. The first conveying wheel set 102 and the second conveying wheel set 103 are engagedly connected, and the first conveying wheel set 102 and the second conveying wheel set 103 define a conveying channel 101. The print head assembly 100 comprises a first driving unit 4. When the first sensing member 202 senses that the cutter 201 is in the first position, the first driving unit 4 is triggered to drive the material conveying unit 1 to withdraw the consumable. Specifically, the first driving unit 4 can be used to drive the first conveying wheel set 102 to rotate clockwise or counterclockwise. Under the meshing action of the first conveying wheel set 102, the second conveying wheel set 103 rotates together with the first conveying wheel set 102, and the rotation direction of the second conveying wheel set 103 is opposite to that of the first conveying wheel set 102, so that the first conveying wheel set 102 and the second conveying wheel set 103 can cooperate with each other to extrude the consumable downward or withdraw the consumable upward.

[0119] In some examples, the first driving unit 4 can be a driving motor. It should be noted that in other embodiments, the first driving unit 4 can also be other driving mechanisms, which can be set according to actual conditions, and will not be described here.

[0120] As an example, the first conveying wheel set 102 and the second conveying wheel set 103 are connected to the first housing 3 respectively. Please refer to FIGS. 8-10, the first conveying wheel set 102 can include a first transmission wheel 1021 and a first conveying wheel 1022 fixedly and coaxially arranged. The second conveying wheel set 103 can include a second transmission wheel 1031 and a second conveying wheel 1032 fixedly and coaxially arranged. The first transmission wheel 1021 and the second transmission wheel 1031 are engagedly connected. The first conveying wheel 1022 and the second conveying wheel 1032 are oppositely and spacedly arranged, and the first conveying wheel 1022 and the second conveying wheel 1032 define a conveying channel 101.

[0121] In some preferred embodiments, please refer to FIGS. 8-10, the print head assembly 100 further includes a discharge port 5, a feeding channel 6 and a sensing unit 7, which are arranged at the second end 101b of the conveying channel 101 respectively.

[0122] The discharge port 5, the feeding channel 6 and the conveying channel 101 are sequentially communicated in the first direction. When the consumable is extruded, the consumable enters the feeding channel 6 from the discharge port 5 and then is extruded from the conveying channel 101. When the consumable is withdrawn, the consumable enters the feeding channel 6 from the conveying channel 101 and then is withdrawn from the discharge port 5.

[0123] Please refer to FIGS. 8-10 and FIG. 14, the sensing unit 7 can include a light blocking piece 701 and a second sensing piece 702. The light blocking piece 701 can move to a third position or a fourth position. When the feeding channel 6 is free of the consumable, the light blocking piece 701 is at the third position, and the light blocking piece 701 at the third position can extend to shield at least part of the feeding channel 6. When the feeding channel 6 has the consumable, the consumable in the feeding channel 6 can press the light blocking piece 701, so as to push the light blocking piece 701 to move to the fourth position.

[0124] One of the light blocking piece 701 at the third position and the light blocking piece 701 at the fourth position shields the second sensing piece 702, and the other does not shield the second sensing piece 702.

[0125] As an optional embodiment, the light blocking piece 701 at the third position does not shield the second sensing piece 702, please refer to FIG. 14. The light blocking piece 701 at the fourth position shields the second sensing piece 702.

[0126] As an example, referring to FIG. 14, the light blocking member 701 can include a main portion 7011 and a second blocking portion 7012 fixed to the main portion 7011. The main portion 7011 has a first end and a second end opposite to each other. The first end of the main portion 7011 is connected to the first housing 3 through the second rotating shaft 703, and the light blocking member 701 can rotate around the second rotating shaft 703. The second sensing member 702 is fixed to the first housing 3, and the second sensing member 702 is provided with a second photoelectric generation groove 7021 facing the second blocking portion 7012. When there is no consumable in the feeding channel 6, the light blocking member 701 is in the third position. The second end of the main portion 7011 in the third position can extend to block at least part of the feeding channel 6, and the second blocking portion 7012 in the third position is not located in the second photoelectric generation groove 7021 and does not block the second sensing member 702. When there is a consumable in the feeding channel 6, the consumable in the feeding channel 6 can press the light blocking member 701, thereby pushing the light blocking member 701 to rotate around the second rotating shaft 703 to the fourth position. In the process of rotating the light blocking member 701 from the third position to the fourth position, the second blocking portion 7012 gradually inserts into the second photoelectric generation groove 7021 to block the second sensing member 702.

[0127] In some more preferred embodiments, referring to FIG. 10 and FIG. 14, along the direction from the first end of the main portion 7011 to the second end of the main portion 7011, the main portion 7011 can include a straight arm 70111 and an arc-shaped arm 70112 connected as one. The arc-shaped arm 70112 of the light blocking member 701 in the third position can extend to block at least part of the feeding channel 6. When there is a consumable in the feeding channel 6, the consumable in the feeding channel 6 can push the arc-shaped arm 70112 of the light blocking member 701 to move the light blocking member 701 to the fourth position.

[0128] In the present embodiment, the main portion 7011 includes the straight arm 70111 and the arc-shaped arm 70112 connected as one. Not only effectively reduces the occupied space of the main portion 7011, makes the structure of the print head assembly 100 more compact, and is more conducive to the miniaturization of the structure of the print head assembly 100, but also can reduce the interference of the main portion 7011 to the consumable as much as possible, and avoid that the consumable cannot enter the conveying channel 101 from the feeding channel 6 due to the interference of the main portion 7011.

[0129] As an example, the second blocking portion 7012 can be fixed to one side of the arc-shaped arm 70112 and arranged close to the straight arm 70111, which can avoid the interference between the second blocking portion 7012 and other environmental elements and the consumable.

[0130] In some more preferred embodiments, referring to Fig. 14, the sensing unit 7 further comprises a second reset member 704. When there is no consumable in the feeding channel 6, the second reset member 704 can drive the light blocking member 701 to move to the third position, so that the second blocking part 7012 is separated from the second photoelectric generating groove 7021, thereby triggering the signal for replacing the consumable, and the replacing mechanism (not shown in the figure) starts to replace the consumable after receiving the signal for replacing the consumable. That is, only after the consumable is completely extracted, the second blocking part 7012 is separated from the second photoelectric generating groove 7021, thereby triggering the signal for replacing the consumable. Since the consumable can press the main part 7011 of the light blocking member 701 when the consumable is in the feeding channel 6, so that the second blocking part 7012 remains inserted in the second photoelectric generating groove 7021, thereby shielding the second sensing member 702, the signal for replacing the consumable will not be triggered before the consumable is completely extracted, that is, the replacing mechanism will not replace the consumable. This can effectively avoid the malfunction of the print head assembly 100 caused by the replacing mechanism replacing the consumable when the consumable is not completely cut off.

[0131] As an example, the second reset member 704 can be a torsion spring. The second reset member 704 can be sleeved on the second rotating shaft 703. When the light blocking member 701 is in the third position, the second reset member 704 is in a natural state. When the consumable presses the main part 7011 of the light blocking member 701 and pushes the light blocking member 701 to rotate to the fourth position, the second reset member 704 is pressed and deformed. Therefore, after the extraction action is completed, that is, when the consumable no longer presses the light blocking member 701, the light blocking member 701 rotates back to the third position under the elastic force of the second reset member 704.

[0132] As an optional embodiment, the working principle of the print head assembly 100 is that when the cutter member 201 completes the cutting action, that is, the cutter member 201 is in the first position, the first blocking part 2013 is inserted into the first photoelectric generating groove 2021 to block the light, thereby triggering the signal for extracting the consumable. After receiving the signal for extracting the consumable, the first driving unit 4 drives the material conveying unit 1 to extract the consumable. When the consumable is completely separated from the feeding channel 6, the light blocking member 701 is ejected to the third position under the action of the second reset member 704, and the second blocking part 7012 is separated from the second photoelectric generating groove 7021, thereby triggering the signal for replacing the consumable, and the replacing mechanism replaces the consumable after receiving the signal for replacing the consumable.

[0133] (Embodiment two)

[0134] An embodiment of the present application provides a print head assembly 100, please refer to Fig. 15, wherein the shank part 2011 has a third edge part 20118 and a fourth edge part 20119, the third edge part 20118 has oppositely arranged first and second ends, the first end of the third edge part 20118 is connected to the first rotating shaft 204, and the blade part 2012 is connected to the fourth edge part 20119. The third edge part 20118 and the fourth edge part 20119 are arranged at an angle, and the third edge part 20118 and the fourth edge part 20119 are arranged on both sides of the first rotating shaft 204, and the distance L3 between the second end of the third edge part 20118 and the first rotating shaft 204 is greater than the distance L4 between the blade part 2012 and the first rotating shaft 204.

[0135] It should be noted that the second embodiment is basically the same as the first embodiment, and therefore the same parts will not be described here.

[0136] (Embodiment three)

[0137] An embodiment of the present application provides a print head assembly 100, please refer to Fig. 16, wherein the first reset member 203 is a spring. Specifically, the side of the cutter member 201 facing the first housing 3 is provided with a receiving space 2019, the first reset member 203 is a spring partially received in the receiving space 2019, and one end of the first reset member 203 abuts against the surface of the receiving space 2019, and the other end of the first reset member 203 abuts against the first housing 3. When the cutter member 201 is in the first position, the first reset member 203 is compressed between the cutter member 201 and the first housing 3. Under the action of the resilience of the first reset member 203, the cutter member 201 can rotate back to the initial position, that is, the second position, around the first rotating shaft 204.

[0138] As an example, the receiving space 2019 can be provided in the shank part 2011. It should be noted that the receiving space 2019 can also be provided at other positions of the cutter member 201, which will not be described here.

[0139] It should be noted that the third embodiment is basically the same as the first embodiment, and therefore the same parts will not be described here.

[0140] An embodiment of the present application provides a print head assembly 100, please refer to Fig. 16, wherein the first reset member 203 is a spring. Specifically, the side of the cutter member 201 facing the first housing 3 is provided with a receiving space 2019, the first reset member 203 is a spring partially received in the receiving space 2019, and one end of the first reset member 203 abuts against the surface of the receiving space 2019, and the other end of the first reset member 203 abuts against the first housing 3. When the cutter member 201 is in the first position, the first reset member 203 is compressed between the cutter member 201 and the first housing 3. Under the action of the resilience of the first reset member 203, the cutter member 201 can rotate back to the initial position, that is, the second position, around the first rotating shaft 204.

[0141] In the embodiment, when the consumable needs to be replaced, an external force acting on the cutter piece 201 in the second direction can be applied to the cutter piece 201 to rotate the cutter piece 201 around the first rotation shaft 204 to the first position, so as to quickly and effectively cut off the consumable extruded by the conveying channel 101, avoiding the consumable in a molten state from being pulled back. After cutting off the consumable, the cutter piece 201 can also be rotated around the first rotation shaft 204 to the second position to be away from the conveying channel 101, and the cutter piece 201 is arranged at the first end 101a of the conveying channel 101 and rotates around the first rotation shaft 204 parallel to the first direction to cut the consumable, which not only has a simple structure, occupies a small space, but also has a small movement stroke, so that the structure of the print head assembly 100 is more compact, and the print head assembly 100 is more conducive to miniaturization.

[0142] In some preferred embodiments, the stereoscopic printing device further comprises a second housing 8. The print head assembly 100 is arranged in the second housing 8, and the print head assembly 100 can be moved in the second direction to abut the cutter piece 201 against the second housing 8, so that the second housing 8 applies an external force to the cutter piece 201. In addition to effectively cutting off the consumable and being conducive to the miniaturization of the print head assembly 100, the embodiment does not need to additionally arrange a driving mechanism to drive the cutter piece 201 to rotate, further saves the occupied space of the print head assembly 100, and effectively reduces the weight and production cost of the print head assembly 100.

[0143] As an example, the print head assembly 100 can be arranged in the second housing 8 of the stereoscopic printing device, and the print head assembly 100 can be moved in the second direction to approach or be away from the surface of the second housing 8. When the print head assembly 100 is moved in the second direction to abut the dynamic point of the cutter piece 201 against the surface of the second housing 8, the second housing 8 can apply an external force F in the second direction to the cutter piece 201, so as to push the cutter piece 201 to rotate to cut the consumable. In addition to effectively cutting off the consumable and being conducive to the miniaturization of the print head assembly 100, the example does not need to additionally arrange a driving mechanism to drive the cutter piece 201 to rotate, further saves the occupied space of the print head assembly 100, and effectively reduces the weight and production cost of the print head assembly 100.

[0144] Please refer to FIG. 5, other structures of the print head assembly 100 can interfere with the second housing 8, causing the cutter piece 201 to be difficult or even impossible to abut the surface of the second housing 8.

[0145] In some more preferred embodiments, in order to further solve the interference problem, the second housing 8 can comprise a body 802 and a protrusion 801 arranged on the body 802 and corresponding to the cutter member 201, as shown in FIG. 3 and FIG. 5, so as to further shorten the distance between the power point of the cutter member 201 and the second housing 8, so that when the printhead assembly 100 moves to abut against the second housing 8 in the second direction, the power point of the cutter member 201 first abuts against the protrusion 801 of the second housing 8. Moreover, when the cutter member 201 rotates to the first position to complete the cutting, there is still a certain gap between other structures of the printhead assembly 100 and the second housing 8, as shown in FIG. 5, so that the cutter member 201 can effectively cut off the consumables.

[0146] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present disclosure.

[0147] The above embodiments only express the preferred embodiments of the present application, which are described in detail and specifically, but should not be construed as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent protection of the present application should be subject to the appended claims.

Claims

1. A printhead assembly, comprising: The application relates to a cutting device for a material conveying unit, comprising: a material conveying unit, comprising a first conveying wheel and a second conveying wheel arranged at intervals to define a conveying channel for extruding or retracting a consumable along a first direction; and a cutter unit, comprising a cutter member and a first rotating shaft, the first rotating shaft being fixed relative to the conveying channel and having an axis parallel to the first direction, the cutter member being connected to the first rotating shaft and arranged at a first end of the conveying channel; under the action of an external force acting on the cutter member along a second direction, the cutter member can rotate about the first rotating shaft to a first position to cut the consumable in the conveying channel, and the cutter member can also rotate about the first rotating shaft to a second position to move away from the conveying channel; wherein the second direction is perpendicular to the first direction.

2. The printhead assembly of claim 1, wherein, The cutter member comprises a cutter handle part connected to the first rotating shaft and a cutter blade part arranged on the cutter handle part, and the cutter member is configured as a lever; a connection center of the cutter handle part and the first rotating shaft is a fulcrum of the lever, the cutter handle part has a first edge part and a second edge part arranged at an angle and arranged on both sides of the fulcrum; the cutter blade part is fixed to the first edge part as a resistance point of the lever, and the external force is applied to the second edge part as a power point of the lever; the distance between the power point and the fulcrum is greater than the distance between the resistance point and the fulcrum; the cutter blade part is configured to rotate to the first position to cut the consumable under the action of the external force.

3. The printhead assembly of claim 2, wherein The second edge part is arranged at an angle to the second direction.

4. The printhead assembly of claim 1, wherein The cutter member comprises a cutter handle part and a cutter blade part, the cutter handle part has a third edge part and a fourth edge part, the third edge part has a first end and a second end arranged oppositely, the first end of the third edge part is connected to the first rotating shaft, and the cutter blade part is connected to the fourth edge part; the third edge part and the fourth edge part are arranged at an angle and arranged on both sides of the first rotating shaft, and the distance between the second end of the third edge part and the first rotating shaft is greater than the distance between the cutter blade part and the first rotating shaft.

5. The printhead assembly of any of claims 1-4, wherein, The cutter unit further comprises a first sensing member; the first sensing member is fixed relative to the conveying channel; the first sensing member is configured to trigger the material conveying unit to retract the consumable and / or trigger the cutter member to stop rotating after sensing that the cutter member is in the first position.

6. The printhead assembly of claim 5, wherein The first sensing member is provided with a first photoelectric generation groove; the cutter member comprises a first shielding part, when the cutter member rotates to the first position, the first shielding part is inserted into or separated from the first photoelectric generation groove; the first sensing member is configured to trigger the material conveying unit to retract the consumable and / or trigger the cutter member to stop rotating after sensing that the first shielding part is inserted into or separated from the first photoelectric generation groove.

7. The printhead assembly of claim 1, wherein The application further comprises a first housing, the material conveying unit is arranged in the first housing, and the cutter member is rotatably connected to the first housing through the first rotating shaft. The cutter unit further comprises a first reset member connected between the cutter member and the first housing, for driving the cutter member to rotate around the first rotating shaft from the first position to a second position, away from the conveying channel.

8. The printhead assembly of claim 7, wherein, The first reset member is a torsion spring limited to the cutter member; The first reset member comprises a first elastic part and a second elastic part connected at one end, the first elastic part and the second elastic part are arranged at an angle, and the first elastic part abuts against the cutter member, and the second elastic part abuts against the first housing; When the cutter member is in the first position, the first reset member is compressed between the cutter member and the first housing.

9. The printhead assembly of claim 8, wherein, The cutter member is provided with a mounting space recessed from the surface of the cutter member at one end in the first direction, the mounting space has a first side surface corresponding to the first elastic part, a second side surface corresponding to the second elastic part, and a bottom surface connected between the first side surface and the second side surface; The cutter member further comprises a first limiting part protruding from the bottom surface of the mounting space; The first reset member further comprises a connecting part connected between the first elastic part and the second elastic part, the connecting part is limited between the first limiting part and the mounting space; When the cutter member rotates, the free end of the first elastic part abuts against the first side surface and moves perpendicularly to the first direction, and the free end of the second elastic part abuts against the first housing and moves perpendicularly to the first direction.

10. The printhead assembly of claim 9, wherein, The cutter member further comprises a second limiting part and a third limiting part, the second limiting part is arranged at one end of the first side surface away from the bottom surface of the mounting space in the first direction, and the third limiting part is arranged at one end of the second side surface away from the bottom surface of the mounting space in the first direction; The first elastic part is located between the second limiting part and the bottom surface of the mounting space in the first direction; When the cutter member is in the second position, the second elastic part is located between the third limiting part and the bottom surface of the mounting space in the first direction.

11. The printhead assembly of claim 7, wherein The cutter member is provided with a receiving space on the side facing the first housing; The first reset member is a spring partially received in the receiving space, one end of the first reset member abuts against the surface of the receiving space, and the other end abuts against the first housing.

12. The printhead assembly of claim 1, wherein, The print head assembly further comprises a discharge port, an inlet channel and a sensing unit arranged at the second end of the conveying channel, the second end of the conveying channel is arranged opposite to the first end of the conveying channel; The discharge port, the inlet channel and the conveying channel are sequentially communicated; The sensing unit comprises a light blocking member and a second sensing member, the light blocking member can move to a third position or a fourth position; When the inlet channel is free of the consumable, the light blocking member is in the third position, and the light blocking member in the third position can extend to shield at least part of the inlet channel; When the inlet channel has the consumable, the consumable in the inlet channel can drive the light blocking member to move to the fourth position; One of the light blocking member in the third position and the light blocking member in the fourth position blocks the second inductive member, and the other does not block the second inductive member.

13. The printhead assembly of claim 12, wherein, The inductive unit further comprises a second reset member; When the feeding channel is empty of the consumable, the second reset member can drive the light blocking member to move to a third position.

14. The printhead assembly of claim 12, wherein, The light blocking member comprises a body portion having a first end and a second end oppositely arranged in the first direction, the first end of the body portion is connected to a second rotating shaft, the second rotating shaft is fixed in position relative to the conveying channel; The second end of the body portion of the light blocking member in the third position blocks at least part of the feeding channel; During the process that the consumable enters the feeding channel, the consumable pushes the light blocking member to rotate around the second rotating shaft to the fourth position.

15. The printhead assembly of claim 14, wherein, In the direction from the first end to the second end of the body portion, the body portion comprises a straight arm and an arc-shaped arm arranged in sequence, the arc-shaped arm of the light blocking member in the third position blocks at least part of the feeding channel.

16. The printhead assembly of claim 14, wherein The light blocking member further comprises a second blocking portion fixed to the body portion, the second light inductive member has a second light-electricity generation groove arranged facing the second blocking portion; The second blocking portion of the light blocking member in the third position is not located in the second light-electricity generation groove, and the second blocking portion of the light blocking member in the fourth position is located in the second light-electricity generation groove; or, the second blocking portion of the light blocking member in the third position is located in the second light-electricity generation groove, and the second blocking portion of the light blocking member in the fourth position is not located in the second light-electricity generation groove.

17. The printhead assembly of claim 1, wherein, The print head assembly further comprises a first driving unit arranged at one end of the material conveying unit in a second direction, for driving the material conveying unit to extrude or retract the consumable; And / or, The print head assembly is arranged on a second driving unit, the second driving unit is used for driving the print head assembly to move in the second direction, and the print head assembly can move in the second direction to abut the cutting knife member against the environmental element, so that the environmental element applies the external force to the cutting knife member.

18. A stereolithography apparatus, characterized in that The print head assembly comprises any one of claims 1 to 17.

19. The stereolithography printing device of claim 18, wherein, The stereoscopic printing device further comprises a second housing; The print head assembly is arranged in the second housing, and the print head assembly can move in the second direction to abut the cutting knife member against the second housing, so that the second housing applies the external force to the cutting knife member.

20. The stereolithography printing device of claim 19, wherein, The second housing comprises a body and a protrusion protruding from the surface of the body, the protrusion is located on the movement path of the cutting knife member; The print head assembly can move in the second direction to abut the cutting knife member against the protrusion, so that the protrusion applies the external force to the cutting knife member.

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